6305 lines
168 KiB
C
6305 lines
168 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_bit.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_dir2.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_trans.h"
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#include "xfs_alloc.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_rtbitmap.h"
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#include "xfs_errortag.h"
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#include "xfs_error.h"
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#include "xfs_quota.h"
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#include "xfs_trans_space.h"
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#include "xfs_buf_item.h"
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#include "xfs_trace.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_filestream.h"
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#include "xfs_rmap.h"
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#include "xfs_ag.h"
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#include "xfs_ag_resv.h"
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#include "xfs_refcount.h"
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#include "xfs_icache.h"
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#include "xfs_iomap.h"
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struct kmem_cache *xfs_bmap_intent_cache;
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/*
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* Miscellaneous helper functions
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*/
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/*
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* Compute and fill in the value of the maximum depth of a bmap btree
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* in this filesystem. Done once, during mount.
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*/
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void
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xfs_bmap_compute_maxlevels(
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xfs_mount_t *mp, /* file system mount structure */
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int whichfork) /* data or attr fork */
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{
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uint64_t maxblocks; /* max blocks at this level */
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xfs_extnum_t maxleafents; /* max leaf entries possible */
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int level; /* btree level */
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int maxrootrecs; /* max records in root block */
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int minleafrecs; /* min records in leaf block */
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int minnoderecs; /* min records in node block */
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int sz; /* root block size */
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/*
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* The maximum number of extents in a fork, hence the maximum number of
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* leaf entries, is controlled by the size of the on-disk extent count.
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*
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* Note that we can no longer assume that if we are in ATTR1 that the
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* fork offset of all the inodes will be
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* (xfs_default_attroffset(ip) >> 3) because we could have mounted with
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* ATTR2 and then mounted back with ATTR1, keeping the i_forkoff's fixed
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* but probably at various positions. Therefore, for both ATTR1 and
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* ATTR2 we have to assume the worst case scenario of a minimum size
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* available.
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*/
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maxleafents = xfs_iext_max_nextents(xfs_has_large_extent_counts(mp),
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whichfork);
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if (whichfork == XFS_DATA_FORK)
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sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
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else
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sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
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maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
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minleafrecs = mp->m_bmap_dmnr[0];
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minnoderecs = mp->m_bmap_dmnr[1];
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maxblocks = howmany_64(maxleafents, minleafrecs);
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for (level = 1; maxblocks > 1; level++) {
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if (maxblocks <= maxrootrecs)
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maxblocks = 1;
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else
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maxblocks = howmany_64(maxblocks, minnoderecs);
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}
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mp->m_bm_maxlevels[whichfork] = level;
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ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk());
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}
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unsigned int
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xfs_bmap_compute_attr_offset(
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struct xfs_mount *mp)
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{
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if (mp->m_sb.sb_inodesize == 256)
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return XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
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return XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
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}
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STATIC int /* error */
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xfs_bmbt_lookup_eq(
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struct xfs_btree_cur *cur,
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struct xfs_bmbt_irec *irec,
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int *stat) /* success/failure */
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{
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cur->bc_rec.b = *irec;
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return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
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}
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STATIC int /* error */
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xfs_bmbt_lookup_first(
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struct xfs_btree_cur *cur,
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int *stat) /* success/failure */
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{
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cur->bc_rec.b.br_startoff = 0;
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cur->bc_rec.b.br_startblock = 0;
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cur->bc_rec.b.br_blockcount = 0;
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return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
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}
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/*
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* Check if the inode needs to be converted to btree format.
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*/
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static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
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{
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struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
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return whichfork != XFS_COW_FORK &&
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ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
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ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork);
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}
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/*
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* Check if the inode should be converted to extent format.
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*/
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static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
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{
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struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
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return whichfork != XFS_COW_FORK &&
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ifp->if_format == XFS_DINODE_FMT_BTREE &&
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ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork);
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}
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/*
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* Update the record referred to by cur to the value given by irec
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* This either works (return 0) or gets an EFSCORRUPTED error.
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*/
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STATIC int
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xfs_bmbt_update(
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struct xfs_btree_cur *cur,
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struct xfs_bmbt_irec *irec)
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{
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union xfs_btree_rec rec;
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xfs_bmbt_disk_set_all(&rec.bmbt, irec);
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return xfs_btree_update(cur, &rec);
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}
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/*
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* Compute the worst-case number of indirect blocks that will be used
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* for ip's delayed extent of length "len".
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*/
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STATIC xfs_filblks_t
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xfs_bmap_worst_indlen(
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xfs_inode_t *ip, /* incore inode pointer */
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xfs_filblks_t len) /* delayed extent length */
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{
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int level; /* btree level number */
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int maxrecs; /* maximum record count at this level */
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xfs_mount_t *mp; /* mount structure */
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xfs_filblks_t rval; /* return value */
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mp = ip->i_mount;
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maxrecs = mp->m_bmap_dmxr[0];
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for (level = 0, rval = 0;
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level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
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level++) {
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len += maxrecs - 1;
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do_div(len, maxrecs);
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rval += len;
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if (len == 1)
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return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
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level - 1;
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if (level == 0)
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maxrecs = mp->m_bmap_dmxr[1];
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}
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return rval;
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}
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/*
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* Calculate the default attribute fork offset for newly created inodes.
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*/
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uint
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xfs_default_attroffset(
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struct xfs_inode *ip)
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{
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if (ip->i_df.if_format == XFS_DINODE_FMT_DEV)
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return roundup(sizeof(xfs_dev_t), 8);
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return M_IGEO(ip->i_mount)->attr_fork_offset;
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}
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/*
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* Helper routine to reset inode i_forkoff field when switching attribute fork
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* from local to extent format - we reset it where possible to make space
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* available for inline data fork extents.
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*/
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STATIC void
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xfs_bmap_forkoff_reset(
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xfs_inode_t *ip,
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int whichfork)
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{
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if (whichfork == XFS_ATTR_FORK &&
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ip->i_df.if_format != XFS_DINODE_FMT_DEV &&
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ip->i_df.if_format != XFS_DINODE_FMT_BTREE) {
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uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
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if (dfl_forkoff > ip->i_forkoff)
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ip->i_forkoff = dfl_forkoff;
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}
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}
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#ifdef DEBUG
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STATIC struct xfs_buf *
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xfs_bmap_get_bp(
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struct xfs_btree_cur *cur,
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xfs_fsblock_t bno)
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{
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struct xfs_log_item *lip;
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int i;
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if (!cur)
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return NULL;
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for (i = 0; i < cur->bc_maxlevels; i++) {
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if (!cur->bc_levels[i].bp)
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break;
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if (xfs_buf_daddr(cur->bc_levels[i].bp) == bno)
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return cur->bc_levels[i].bp;
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}
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/* Chase down all the log items to see if the bp is there */
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list_for_each_entry(lip, &cur->bc_tp->t_items, li_trans) {
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struct xfs_buf_log_item *bip = (struct xfs_buf_log_item *)lip;
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if (bip->bli_item.li_type == XFS_LI_BUF &&
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xfs_buf_daddr(bip->bli_buf) == bno)
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return bip->bli_buf;
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}
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return NULL;
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}
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STATIC void
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xfs_check_block(
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struct xfs_btree_block *block,
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xfs_mount_t *mp,
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int root,
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short sz)
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{
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int i, j, dmxr;
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__be64 *pp, *thispa; /* pointer to block address */
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xfs_bmbt_key_t *prevp, *keyp;
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ASSERT(be16_to_cpu(block->bb_level) > 0);
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prevp = NULL;
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for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
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dmxr = mp->m_bmap_dmxr[0];
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keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
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if (prevp) {
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ASSERT(be64_to_cpu(prevp->br_startoff) <
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be64_to_cpu(keyp->br_startoff));
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}
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prevp = keyp;
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/*
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* Compare the block numbers to see if there are dups.
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*/
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if (root)
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pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
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else
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pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
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for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
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if (root)
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thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
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else
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thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
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if (*thispa == *pp) {
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xfs_warn(mp, "%s: thispa(%d) == pp(%d) %lld",
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__func__, j, i,
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(unsigned long long)be64_to_cpu(*thispa));
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xfs_err(mp, "%s: ptrs are equal in node\n",
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__func__);
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xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
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}
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}
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}
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}
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/*
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* Check that the extents for the inode ip are in the right order in all
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* btree leaves. THis becomes prohibitively expensive for large extent count
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* files, so don't bother with inodes that have more than 10,000 extents in
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* them. The btree record ordering checks will still be done, so for such large
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* bmapbt constructs that is going to catch most corruptions.
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*/
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STATIC void
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xfs_bmap_check_leaf_extents(
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struct xfs_btree_cur *cur, /* btree cursor or null */
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xfs_inode_t *ip, /* incore inode pointer */
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int whichfork) /* data or attr fork */
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
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struct xfs_btree_block *block; /* current btree block */
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xfs_fsblock_t bno; /* block # of "block" */
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struct xfs_buf *bp; /* buffer for "block" */
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int error; /* error return value */
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xfs_extnum_t i=0, j; /* index into the extents list */
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int level; /* btree level, for checking */
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__be64 *pp; /* pointer to block address */
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xfs_bmbt_rec_t *ep; /* pointer to current extent */
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xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
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xfs_bmbt_rec_t *nextp; /* pointer to next extent */
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int bp_release = 0;
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if (ifp->if_format != XFS_DINODE_FMT_BTREE)
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return;
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/* skip large extent count inodes */
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if (ip->i_df.if_nextents > 10000)
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return;
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bno = NULLFSBLOCK;
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block = ifp->if_broot;
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/*
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* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
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*/
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level = be16_to_cpu(block->bb_level);
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ASSERT(level > 0);
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xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
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pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
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bno = be64_to_cpu(*pp);
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ASSERT(bno != NULLFSBLOCK);
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ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
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ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
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/*
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* Go down the tree until leaf level is reached, following the first
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* pointer (leftmost) at each level.
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*/
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while (level-- > 0) {
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/* See if buf is in cur first */
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bp_release = 0;
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bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
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if (!bp) {
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bp_release = 1;
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error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
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XFS_BMAP_BTREE_REF,
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&xfs_bmbt_buf_ops);
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if (error)
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goto error_norelse;
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}
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block = XFS_BUF_TO_BLOCK(bp);
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if (level == 0)
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break;
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/*
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* Check this block for basic sanity (increasing keys and
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* no duplicate blocks).
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*/
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xfs_check_block(block, mp, 0, 0);
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pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
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bno = be64_to_cpu(*pp);
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if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, bno))) {
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error = -EFSCORRUPTED;
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goto error0;
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}
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if (bp_release) {
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bp_release = 0;
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xfs_trans_brelse(NULL, bp);
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}
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}
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/*
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* Here with bp and block set to the leftmost leaf node in the tree.
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*/
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i = 0;
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/*
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* Loop over all leaf nodes checking that all extents are in the right order.
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*/
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for (;;) {
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xfs_fsblock_t nextbno;
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xfs_extnum_t num_recs;
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|
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num_recs = xfs_btree_get_numrecs(block);
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/*
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* Read-ahead the next leaf block, if any.
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*/
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nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
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/*
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* Check all the extents to make sure they are OK.
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* If we had a previous block, the last entry should
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* conform with the first entry in this one.
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*/
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ep = XFS_BMBT_REC_ADDR(mp, block, 1);
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if (i) {
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ASSERT(xfs_bmbt_disk_get_startoff(&last) +
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xfs_bmbt_disk_get_blockcount(&last) <=
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xfs_bmbt_disk_get_startoff(ep));
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}
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for (j = 1; j < num_recs; j++) {
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nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
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ASSERT(xfs_bmbt_disk_get_startoff(ep) +
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xfs_bmbt_disk_get_blockcount(ep) <=
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xfs_bmbt_disk_get_startoff(nextp));
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ep = nextp;
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}
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last = *ep;
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i += num_recs;
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if (bp_release) {
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bp_release = 0;
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xfs_trans_brelse(NULL, bp);
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}
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bno = nextbno;
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/*
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* If we've reached the end, stop.
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*/
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if (bno == NULLFSBLOCK)
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break;
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bp_release = 0;
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bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
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if (!bp) {
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bp_release = 1;
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error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
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XFS_BMAP_BTREE_REF,
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&xfs_bmbt_buf_ops);
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if (error)
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goto error_norelse;
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}
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block = XFS_BUF_TO_BLOCK(bp);
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}
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return;
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error0:
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xfs_warn(mp, "%s: at error0", __func__);
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if (bp_release)
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xfs_trans_brelse(NULL, bp);
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error_norelse:
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xfs_warn(mp, "%s: BAD after btree leaves for %llu extents",
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__func__, i);
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xfs_err(mp, "%s: CORRUPTED BTREE OR SOMETHING", __func__);
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xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
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return;
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}
|
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|
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/*
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|
* Validate that the bmbt_irecs being returned from bmapi are valid
|
|
* given the caller's original parameters. Specifically check the
|
|
* ranges of the returned irecs to ensure that they only extend beyond
|
|
* the given parameters if the XFS_BMAPI_ENTIRE flag was set.
|
|
*/
|
|
STATIC void
|
|
xfs_bmap_validate_ret(
|
|
xfs_fileoff_t bno,
|
|
xfs_filblks_t len,
|
|
uint32_t flags,
|
|
xfs_bmbt_irec_t *mval,
|
|
int nmap,
|
|
int ret_nmap)
|
|
{
|
|
int i; /* index to map values */
|
|
|
|
ASSERT(ret_nmap <= nmap);
|
|
|
|
for (i = 0; i < ret_nmap; i++) {
|
|
ASSERT(mval[i].br_blockcount > 0);
|
|
if (!(flags & XFS_BMAPI_ENTIRE)) {
|
|
ASSERT(mval[i].br_startoff >= bno);
|
|
ASSERT(mval[i].br_blockcount <= len);
|
|
ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
|
|
bno + len);
|
|
} else {
|
|
ASSERT(mval[i].br_startoff < bno + len);
|
|
ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
|
|
bno);
|
|
}
|
|
ASSERT(i == 0 ||
|
|
mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
|
|
mval[i].br_startoff);
|
|
ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
|
|
mval[i].br_startblock != HOLESTARTBLOCK);
|
|
ASSERT(mval[i].br_state == XFS_EXT_NORM ||
|
|
mval[i].br_state == XFS_EXT_UNWRITTEN);
|
|
}
|
|
}
|
|
|
|
#else
|
|
#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
|
|
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0)
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Inode fork format manipulation functions
|
|
*/
|
|
|
|
/*
|
|
* Convert the inode format to extent format if it currently is in btree format,
|
|
* but the extent list is small enough that it fits into the extent format.
|
|
*
|
|
* Since the extents are already in-core, all we have to do is give up the space
|
|
* for the btree root and pitch the leaf block.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_btree_to_extents(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode pointer */
|
|
struct xfs_btree_cur *cur, /* btree cursor */
|
|
int *logflagsp, /* inode logging flags */
|
|
int whichfork) /* data or attr fork */
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_btree_block *rblock = ifp->if_broot;
|
|
struct xfs_btree_block *cblock;/* child btree block */
|
|
xfs_fsblock_t cbno; /* child block number */
|
|
struct xfs_buf *cbp; /* child block's buffer */
|
|
int error; /* error return value */
|
|
__be64 *pp; /* ptr to block address */
|
|
struct xfs_owner_info oinfo;
|
|
|
|
/* check if we actually need the extent format first: */
|
|
if (!xfs_bmap_wants_extents(ip, whichfork))
|
|
return 0;
|
|
|
|
ASSERT(cur);
|
|
ASSERT(whichfork != XFS_COW_FORK);
|
|
ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
|
|
ASSERT(be16_to_cpu(rblock->bb_level) == 1);
|
|
ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
|
|
ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
|
|
|
|
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
|
|
cbno = be64_to_cpu(*pp);
|
|
#ifdef DEBUG
|
|
if (XFS_IS_CORRUPT(cur->bc_mp, !xfs_btree_check_lptr(cur, cbno, 1)))
|
|
return -EFSCORRUPTED;
|
|
#endif
|
|
error = xfs_btree_read_bufl(mp, tp, cbno, &cbp, XFS_BMAP_BTREE_REF,
|
|
&xfs_bmbt_buf_ops);
|
|
if (error)
|
|
return error;
|
|
cblock = XFS_BUF_TO_BLOCK(cbp);
|
|
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
|
|
return error;
|
|
|
|
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
|
|
error = xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo,
|
|
XFS_AG_RESV_NONE);
|
|
if (error)
|
|
return error;
|
|
|
|
ip->i_nblocks--;
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
|
|
xfs_trans_binval(tp, cbp);
|
|
if (cur->bc_levels[0].bp == cbp)
|
|
cur->bc_levels[0].bp = NULL;
|
|
xfs_iroot_realloc(ip, -1, whichfork);
|
|
ASSERT(ifp->if_broot == NULL);
|
|
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
|
|
*logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Convert an extents-format file into a btree-format file.
|
|
* The new file will have a root block (in the inode) and a single child block.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_extents_to_btree(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode pointer */
|
|
struct xfs_btree_cur **curp, /* cursor returned to caller */
|
|
int wasdel, /* converting a delayed alloc */
|
|
int *logflagsp, /* inode logging flags */
|
|
int whichfork) /* data or attr fork */
|
|
{
|
|
struct xfs_btree_block *ablock; /* allocated (child) bt block */
|
|
struct xfs_buf *abp; /* buffer for ablock */
|
|
struct xfs_alloc_arg args; /* allocation arguments */
|
|
struct xfs_bmbt_rec *arp; /* child record pointer */
|
|
struct xfs_btree_block *block; /* btree root block */
|
|
struct xfs_btree_cur *cur; /* bmap btree cursor */
|
|
int error; /* error return value */
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
struct xfs_bmbt_key *kp; /* root block key pointer */
|
|
struct xfs_mount *mp; /* mount structure */
|
|
xfs_bmbt_ptr_t *pp; /* root block address pointer */
|
|
struct xfs_iext_cursor icur;
|
|
struct xfs_bmbt_irec rec;
|
|
xfs_extnum_t cnt = 0;
|
|
|
|
mp = ip->i_mount;
|
|
ASSERT(whichfork != XFS_COW_FORK);
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS);
|
|
|
|
/*
|
|
* Make space in the inode incore. This needs to be undone if we fail
|
|
* to expand the root.
|
|
*/
|
|
xfs_iroot_realloc(ip, 1, whichfork);
|
|
|
|
/*
|
|
* Fill in the root.
|
|
*/
|
|
block = ifp->if_broot;
|
|
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
|
|
XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
|
|
XFS_BTREE_LONG_PTRS);
|
|
/*
|
|
* Need a cursor. Can't allocate until bb_level is filled in.
|
|
*/
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
|
|
/*
|
|
* Convert to a btree with two levels, one record in root.
|
|
*/
|
|
ifp->if_format = XFS_DINODE_FMT_BTREE;
|
|
memset(&args, 0, sizeof(args));
|
|
args.tp = tp;
|
|
args.mp = mp;
|
|
xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
|
|
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
args.wasdel = wasdel;
|
|
*logflagsp = 0;
|
|
error = xfs_alloc_vextent_start_ag(&args,
|
|
XFS_INO_TO_FSB(mp, ip->i_ino));
|
|
if (error)
|
|
goto out_root_realloc;
|
|
|
|
/*
|
|
* Allocation can't fail, the space was reserved.
|
|
*/
|
|
if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
|
|
error = -ENOSPC;
|
|
goto out_root_realloc;
|
|
}
|
|
|
|
cur->bc_ino.allocated++;
|
|
ip->i_nblocks++;
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
|
|
error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, args.fsbno),
|
|
mp->m_bsize, 0, &abp);
|
|
if (error)
|
|
goto out_unreserve_dquot;
|
|
|
|
/*
|
|
* Fill in the child block.
|
|
*/
|
|
abp->b_ops = &xfs_bmbt_buf_ops;
|
|
ablock = XFS_BUF_TO_BLOCK(abp);
|
|
xfs_btree_init_block_int(mp, ablock, xfs_buf_daddr(abp),
|
|
XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
|
|
XFS_BTREE_LONG_PTRS);
|
|
|
|
for_each_xfs_iext(ifp, &icur, &rec) {
|
|
if (isnullstartblock(rec.br_startblock))
|
|
continue;
|
|
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt);
|
|
xfs_bmbt_disk_set_all(arp, &rec);
|
|
cnt++;
|
|
}
|
|
ASSERT(cnt == ifp->if_nextents);
|
|
xfs_btree_set_numrecs(ablock, cnt);
|
|
|
|
/*
|
|
* Fill in the root key and pointer.
|
|
*/
|
|
kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
|
|
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
|
|
kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
|
|
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
|
|
be16_to_cpu(block->bb_level)));
|
|
*pp = cpu_to_be64(args.fsbno);
|
|
|
|
/*
|
|
* Do all this logging at the end so that
|
|
* the root is at the right level.
|
|
*/
|
|
xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
|
|
xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
|
|
ASSERT(*curp == NULL);
|
|
*curp = cur;
|
|
*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
|
|
return 0;
|
|
|
|
out_unreserve_dquot:
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
|
|
out_root_realloc:
|
|
xfs_iroot_realloc(ip, -1, whichfork);
|
|
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
|
|
ASSERT(ifp->if_broot == NULL);
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Convert a local file to an extents file.
|
|
* This code is out of bounds for data forks of regular files,
|
|
* since the file data needs to get logged so things will stay consistent.
|
|
* (The bmap-level manipulations are ok, though).
|
|
*/
|
|
void
|
|
xfs_bmap_local_to_extents_empty(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
|
|
ASSERT(whichfork != XFS_COW_FORK);
|
|
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
|
|
ASSERT(ifp->if_bytes == 0);
|
|
ASSERT(ifp->if_nextents == 0);
|
|
|
|
xfs_bmap_forkoff_reset(ip, whichfork);
|
|
ifp->if_u1.if_root = NULL;
|
|
ifp->if_height = 0;
|
|
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
}
|
|
|
|
|
|
STATIC int /* error */
|
|
xfs_bmap_local_to_extents(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
xfs_extlen_t total, /* total blocks needed by transaction */
|
|
int *logflagsp, /* inode logging flags */
|
|
int whichfork,
|
|
void (*init_fn)(struct xfs_trans *tp,
|
|
struct xfs_buf *bp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_ifork *ifp))
|
|
{
|
|
int error = 0;
|
|
int flags; /* logging flags returned */
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
xfs_alloc_arg_t args; /* allocation arguments */
|
|
struct xfs_buf *bp; /* buffer for extent block */
|
|
struct xfs_bmbt_irec rec;
|
|
struct xfs_iext_cursor icur;
|
|
|
|
/*
|
|
* We don't want to deal with the case of keeping inode data inline yet.
|
|
* So sending the data fork of a regular inode is invalid.
|
|
*/
|
|
ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
|
|
|
|
if (!ifp->if_bytes) {
|
|
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
|
|
flags = XFS_ILOG_CORE;
|
|
goto done;
|
|
}
|
|
|
|
flags = 0;
|
|
error = 0;
|
|
memset(&args, 0, sizeof(args));
|
|
args.tp = tp;
|
|
args.mp = ip->i_mount;
|
|
args.total = total;
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
|
|
|
|
/*
|
|
* Allocate a block. We know we need only one, since the
|
|
* file currently fits in an inode.
|
|
*/
|
|
args.total = total;
|
|
args.minlen = args.maxlen = args.prod = 1;
|
|
error = xfs_alloc_vextent_start_ag(&args,
|
|
XFS_INO_TO_FSB(args.mp, ip->i_ino));
|
|
if (error)
|
|
goto done;
|
|
|
|
/* Can't fail, the space was reserved. */
|
|
ASSERT(args.fsbno != NULLFSBLOCK);
|
|
ASSERT(args.len == 1);
|
|
error = xfs_trans_get_buf(tp, args.mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(args.mp, args.fsbno),
|
|
args.mp->m_bsize, 0, &bp);
|
|
if (error)
|
|
goto done;
|
|
|
|
/*
|
|
* Initialize the block, copy the data and log the remote buffer.
|
|
*
|
|
* The callout is responsible for logging because the remote format
|
|
* might differ from the local format and thus we don't know how much to
|
|
* log here. Note that init_fn must also set the buffer log item type
|
|
* correctly.
|
|
*/
|
|
init_fn(tp, bp, ip, ifp);
|
|
|
|
/* account for the change in fork size */
|
|
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
|
|
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
|
|
flags |= XFS_ILOG_CORE;
|
|
|
|
ifp->if_u1.if_root = NULL;
|
|
ifp->if_height = 0;
|
|
|
|
rec.br_startoff = 0;
|
|
rec.br_startblock = args.fsbno;
|
|
rec.br_blockcount = 1;
|
|
rec.br_state = XFS_EXT_NORM;
|
|
xfs_iext_first(ifp, &icur);
|
|
xfs_iext_insert(ip, &icur, &rec, 0);
|
|
|
|
ifp->if_nextents = 1;
|
|
ip->i_nblocks = 1;
|
|
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
|
|
flags |= xfs_ilog_fext(whichfork);
|
|
|
|
done:
|
|
*logflagsp = flags;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Called from xfs_bmap_add_attrfork to handle btree format files.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_add_attrfork_btree(
|
|
xfs_trans_t *tp, /* transaction pointer */
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
int *flags) /* inode logging flags */
|
|
{
|
|
struct xfs_btree_block *block = ip->i_df.if_broot;
|
|
struct xfs_btree_cur *cur; /* btree cursor */
|
|
int error; /* error return value */
|
|
xfs_mount_t *mp; /* file system mount struct */
|
|
int stat; /* newroot status */
|
|
|
|
mp = ip->i_mount;
|
|
|
|
if (XFS_BMAP_BMDR_SPACE(block) <= xfs_inode_data_fork_size(ip))
|
|
*flags |= XFS_ILOG_DBROOT;
|
|
else {
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
|
|
error = xfs_bmbt_lookup_first(cur, &stat);
|
|
if (error)
|
|
goto error0;
|
|
/* must be at least one entry */
|
|
if (XFS_IS_CORRUPT(mp, stat != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto error0;
|
|
}
|
|
if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
|
|
goto error0;
|
|
if (stat == 0) {
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return -ENOSPC;
|
|
}
|
|
cur->bc_ino.allocated = 0;
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
}
|
|
return 0;
|
|
error0:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Called from xfs_bmap_add_attrfork to handle extents format files.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_add_attrfork_extents(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode pointer */
|
|
int *flags) /* inode logging flags */
|
|
{
|
|
struct xfs_btree_cur *cur; /* bmap btree cursor */
|
|
int error; /* error return value */
|
|
|
|
if (ip->i_df.if_nextents * sizeof(struct xfs_bmbt_rec) <=
|
|
xfs_inode_data_fork_size(ip))
|
|
return 0;
|
|
cur = NULL;
|
|
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, flags,
|
|
XFS_DATA_FORK);
|
|
if (cur) {
|
|
cur->bc_ino.allocated = 0;
|
|
xfs_btree_del_cursor(cur, error);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Called from xfs_bmap_add_attrfork to handle local format files. Each
|
|
* different data fork content type needs a different callout to do the
|
|
* conversion. Some are basic and only require special block initialisation
|
|
* callouts for the data formating, others (directories) are so specialised they
|
|
* handle everything themselves.
|
|
*
|
|
* XXX (dgc): investigate whether directory conversion can use the generic
|
|
* formatting callout. It should be possible - it's just a very complex
|
|
* formatter.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_add_attrfork_local(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode pointer */
|
|
int *flags) /* inode logging flags */
|
|
{
|
|
struct xfs_da_args dargs; /* args for dir/attr code */
|
|
|
|
if (ip->i_df.if_bytes <= xfs_inode_data_fork_size(ip))
|
|
return 0;
|
|
|
|
if (S_ISDIR(VFS_I(ip)->i_mode)) {
|
|
memset(&dargs, 0, sizeof(dargs));
|
|
dargs.geo = ip->i_mount->m_dir_geo;
|
|
dargs.dp = ip;
|
|
dargs.total = dargs.geo->fsbcount;
|
|
dargs.whichfork = XFS_DATA_FORK;
|
|
dargs.trans = tp;
|
|
return xfs_dir2_sf_to_block(&dargs);
|
|
}
|
|
|
|
if (S_ISLNK(VFS_I(ip)->i_mode))
|
|
return xfs_bmap_local_to_extents(tp, ip, 1, flags,
|
|
XFS_DATA_FORK,
|
|
xfs_symlink_local_to_remote);
|
|
|
|
/* should only be called for types that support local format data */
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/*
|
|
* Set an inode attr fork offset based on the format of the data fork.
|
|
*/
|
|
static int
|
|
xfs_bmap_set_attrforkoff(
|
|
struct xfs_inode *ip,
|
|
int size,
|
|
int *version)
|
|
{
|
|
int default_size = xfs_default_attroffset(ip) >> 3;
|
|
|
|
switch (ip->i_df.if_format) {
|
|
case XFS_DINODE_FMT_DEV:
|
|
ip->i_forkoff = default_size;
|
|
break;
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
case XFS_DINODE_FMT_BTREE:
|
|
ip->i_forkoff = xfs_attr_shortform_bytesfit(ip, size);
|
|
if (!ip->i_forkoff)
|
|
ip->i_forkoff = default_size;
|
|
else if (xfs_has_attr2(ip->i_mount) && version)
|
|
*version = 2;
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Convert inode from non-attributed to attributed.
|
|
* Must not be in a transaction, ip must not be locked.
|
|
*/
|
|
int /* error code */
|
|
xfs_bmap_add_attrfork(
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
int size, /* space new attribute needs */
|
|
int rsvd) /* xact may use reserved blks */
|
|
{
|
|
xfs_mount_t *mp; /* mount structure */
|
|
xfs_trans_t *tp; /* transaction pointer */
|
|
int blks; /* space reservation */
|
|
int version = 1; /* superblock attr version */
|
|
int logflags; /* logging flags */
|
|
int error; /* error return value */
|
|
|
|
ASSERT(xfs_inode_has_attr_fork(ip) == 0);
|
|
|
|
mp = ip->i_mount;
|
|
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
|
|
|
|
blks = XFS_ADDAFORK_SPACE_RES(mp);
|
|
|
|
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_addafork, blks, 0,
|
|
rsvd, &tp);
|
|
if (error)
|
|
return error;
|
|
if (xfs_inode_has_attr_fork(ip))
|
|
goto trans_cancel;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
error = xfs_bmap_set_attrforkoff(ip, size, &version);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
xfs_ifork_init_attr(ip, XFS_DINODE_FMT_EXTENTS, 0);
|
|
logflags = 0;
|
|
switch (ip->i_df.if_format) {
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
error = xfs_bmap_add_attrfork_local(tp, ip, &logflags);
|
|
break;
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
error = xfs_bmap_add_attrfork_extents(tp, ip, &logflags);
|
|
break;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
error = xfs_bmap_add_attrfork_btree(tp, ip, &logflags);
|
|
break;
|
|
default:
|
|
error = 0;
|
|
break;
|
|
}
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
if (error)
|
|
goto trans_cancel;
|
|
if (!xfs_has_attr(mp) ||
|
|
(!xfs_has_attr2(mp) && version == 2)) {
|
|
bool log_sb = false;
|
|
|
|
spin_lock(&mp->m_sb_lock);
|
|
if (!xfs_has_attr(mp)) {
|
|
xfs_add_attr(mp);
|
|
log_sb = true;
|
|
}
|
|
if (!xfs_has_attr2(mp) && version == 2) {
|
|
xfs_add_attr2(mp);
|
|
log_sb = true;
|
|
}
|
|
spin_unlock(&mp->m_sb_lock);
|
|
if (log_sb)
|
|
xfs_log_sb(tp);
|
|
}
|
|
|
|
error = xfs_trans_commit(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Internal and external extent tree search functions.
|
|
*/
|
|
|
|
struct xfs_iread_state {
|
|
struct xfs_iext_cursor icur;
|
|
xfs_extnum_t loaded;
|
|
};
|
|
|
|
int
|
|
xfs_bmap_complain_bad_rec(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
xfs_failaddr_t fa,
|
|
const struct xfs_bmbt_irec *irec)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
const char *forkname;
|
|
|
|
switch (whichfork) {
|
|
case XFS_DATA_FORK: forkname = "data"; break;
|
|
case XFS_ATTR_FORK: forkname = "attr"; break;
|
|
case XFS_COW_FORK: forkname = "CoW"; break;
|
|
default: forkname = "???"; break;
|
|
}
|
|
|
|
xfs_warn(mp,
|
|
"Bmap BTree record corruption in inode 0x%llx %s fork detected at %pS!",
|
|
ip->i_ino, forkname, fa);
|
|
xfs_warn(mp,
|
|
"Offset 0x%llx, start block 0x%llx, block count 0x%llx state 0x%x",
|
|
irec->br_startoff, irec->br_startblock, irec->br_blockcount,
|
|
irec->br_state);
|
|
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* Stuff every bmbt record from this block into the incore extent map. */
|
|
static int
|
|
xfs_iread_bmbt_block(
|
|
struct xfs_btree_cur *cur,
|
|
int level,
|
|
void *priv)
|
|
{
|
|
struct xfs_iread_state *ir = priv;
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_inode *ip = cur->bc_ino.ip;
|
|
struct xfs_btree_block *block;
|
|
struct xfs_buf *bp;
|
|
struct xfs_bmbt_rec *frp;
|
|
xfs_extnum_t num_recs;
|
|
xfs_extnum_t j;
|
|
int whichfork = cur->bc_ino.whichfork;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
|
|
block = xfs_btree_get_block(cur, level, &bp);
|
|
|
|
/* Abort if we find more records than nextents. */
|
|
num_recs = xfs_btree_get_numrecs(block);
|
|
if (unlikely(ir->loaded + num_recs > ifp->if_nextents)) {
|
|
xfs_warn(ip->i_mount, "corrupt dinode %llu, (btree extents).",
|
|
(unsigned long long)ip->i_ino);
|
|
xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, block,
|
|
sizeof(*block), __this_address);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/* Copy records into the incore cache. */
|
|
frp = XFS_BMBT_REC_ADDR(mp, block, 1);
|
|
for (j = 0; j < num_recs; j++, frp++, ir->loaded++) {
|
|
struct xfs_bmbt_irec new;
|
|
xfs_failaddr_t fa;
|
|
|
|
xfs_bmbt_disk_get_all(frp, &new);
|
|
fa = xfs_bmap_validate_extent(ip, whichfork, &new);
|
|
if (fa) {
|
|
xfs_inode_verifier_error(ip, -EFSCORRUPTED,
|
|
"xfs_iread_extents(2)", frp,
|
|
sizeof(*frp), fa);
|
|
return xfs_bmap_complain_bad_rec(ip, whichfork, fa,
|
|
&new);
|
|
}
|
|
xfs_iext_insert(ip, &ir->icur, &new,
|
|
xfs_bmap_fork_to_state(whichfork));
|
|
trace_xfs_read_extent(ip, &ir->icur,
|
|
xfs_bmap_fork_to_state(whichfork), _THIS_IP_);
|
|
xfs_iext_next(ifp, &ir->icur);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Read in extents from a btree-format inode.
|
|
*/
|
|
int
|
|
xfs_iread_extents(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork)
|
|
{
|
|
struct xfs_iread_state ir;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_btree_cur *cur;
|
|
int error;
|
|
|
|
if (!xfs_need_iread_extents(ifp))
|
|
return 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
ir.loaded = 0;
|
|
xfs_iext_first(ifp, &ir.icur);
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
error = xfs_btree_visit_blocks(cur, xfs_iread_bmbt_block,
|
|
XFS_BTREE_VISIT_RECORDS, &ir);
|
|
xfs_btree_del_cursor(cur, error);
|
|
if (error)
|
|
goto out;
|
|
|
|
if (XFS_IS_CORRUPT(mp, ir.loaded != ifp->if_nextents)) {
|
|
error = -EFSCORRUPTED;
|
|
goto out;
|
|
}
|
|
ASSERT(ir.loaded == xfs_iext_count(ifp));
|
|
/*
|
|
* Use release semantics so that we can use acquire semantics in
|
|
* xfs_need_iread_extents and be guaranteed to see a valid mapping tree
|
|
* after that load.
|
|
*/
|
|
smp_store_release(&ifp->if_needextents, 0);
|
|
return 0;
|
|
out:
|
|
xfs_iext_destroy(ifp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Returns the relative block number of the first unused block(s) in the given
|
|
* fork with at least "len" logically contiguous blocks free. This is the
|
|
* lowest-address hole if the fork has holes, else the first block past the end
|
|
* of fork. Return 0 if the fork is currently local (in-inode).
|
|
*/
|
|
int /* error */
|
|
xfs_bmap_first_unused(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode */
|
|
xfs_extlen_t len, /* size of hole to find */
|
|
xfs_fileoff_t *first_unused, /* unused block */
|
|
int whichfork) /* data or attr fork */
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec got;
|
|
struct xfs_iext_cursor icur;
|
|
xfs_fileoff_t lastaddr = 0;
|
|
xfs_fileoff_t lowest, max;
|
|
int error;
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
|
|
*first_unused = 0;
|
|
return 0;
|
|
}
|
|
|
|
ASSERT(xfs_ifork_has_extents(ifp));
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
lowest = max = *first_unused;
|
|
for_each_xfs_iext(ifp, &icur, &got) {
|
|
/*
|
|
* See if the hole before this extent will work.
|
|
*/
|
|
if (got.br_startoff >= lowest + len &&
|
|
got.br_startoff - max >= len)
|
|
break;
|
|
lastaddr = got.br_startoff + got.br_blockcount;
|
|
max = XFS_FILEOFF_MAX(lastaddr, lowest);
|
|
}
|
|
|
|
*first_unused = max;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns the file-relative block number of the last block - 1 before
|
|
* last_block (input value) in the file.
|
|
* This is not based on i_size, it is based on the extent records.
|
|
* Returns 0 for local files, as they do not have extent records.
|
|
*/
|
|
int /* error */
|
|
xfs_bmap_last_before(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode */
|
|
xfs_fileoff_t *last_block, /* last block */
|
|
int whichfork) /* data or attr fork */
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec got;
|
|
struct xfs_iext_cursor icur;
|
|
int error;
|
|
|
|
switch (ifp->if_format) {
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
*last_block = 0;
|
|
return 0;
|
|
case XFS_DINODE_FMT_BTREE:
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got))
|
|
*last_block = 0;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_bmap_last_extent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *rec,
|
|
int *is_empty)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_iext_cursor icur;
|
|
int error;
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_iext_last(ifp, &icur);
|
|
if (!xfs_iext_get_extent(ifp, &icur, rec))
|
|
*is_empty = 1;
|
|
else
|
|
*is_empty = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check the last inode extent to determine whether this allocation will result
|
|
* in blocks being allocated at the end of the file. When we allocate new data
|
|
* blocks at the end of the file which do not start at the previous data block,
|
|
* we will try to align the new blocks at stripe unit boundaries.
|
|
*
|
|
* Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
|
|
* at, or past the EOF.
|
|
*/
|
|
STATIC int
|
|
xfs_bmap_isaeof(
|
|
struct xfs_bmalloca *bma,
|
|
int whichfork)
|
|
{
|
|
struct xfs_bmbt_irec rec;
|
|
int is_empty;
|
|
int error;
|
|
|
|
bma->aeof = false;
|
|
error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
|
|
&is_empty);
|
|
if (error)
|
|
return error;
|
|
|
|
if (is_empty) {
|
|
bma->aeof = true;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if we are allocation or past the last extent, or at least into
|
|
* the last delayed allocated extent.
|
|
*/
|
|
bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
|
|
(bma->offset >= rec.br_startoff &&
|
|
isnullstartblock(rec.br_startblock));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Returns the file-relative block number of the first block past eof in
|
|
* the file. This is not based on i_size, it is based on the extent records.
|
|
* Returns 0 for local files, as they do not have extent records.
|
|
*/
|
|
int
|
|
xfs_bmap_last_offset(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t *last_block,
|
|
int whichfork)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec rec;
|
|
int is_empty;
|
|
int error;
|
|
|
|
*last_block = 0;
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_LOCAL)
|
|
return 0;
|
|
|
|
if (XFS_IS_CORRUPT(ip->i_mount, !xfs_ifork_has_extents(ifp)))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
|
|
if (error || is_empty)
|
|
return error;
|
|
|
|
*last_block = rec.br_startoff + rec.br_blockcount;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Extent tree manipulation functions used during allocation.
|
|
*/
|
|
|
|
/*
|
|
* Convert a delayed allocation to a real allocation.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_add_extent_delay_real(
|
|
struct xfs_bmalloca *bma,
|
|
int whichfork)
|
|
{
|
|
struct xfs_mount *mp = bma->ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
|
|
struct xfs_bmbt_irec *new = &bma->got;
|
|
int error; /* error return value */
|
|
int i; /* temp state */
|
|
xfs_fileoff_t new_endoff; /* end offset of new entry */
|
|
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
|
|
/* left is 0, right is 1, prev is 2 */
|
|
int rval=0; /* return value (logging flags) */
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
xfs_filblks_t da_new; /* new count del alloc blocks used */
|
|
xfs_filblks_t da_old; /* old count del alloc blocks used */
|
|
xfs_filblks_t temp=0; /* value for da_new calculations */
|
|
int tmp_rval; /* partial logging flags */
|
|
struct xfs_bmbt_irec old;
|
|
|
|
ASSERT(whichfork != XFS_ATTR_FORK);
|
|
ASSERT(!isnullstartblock(new->br_startblock));
|
|
ASSERT(!bma->cur ||
|
|
(bma->cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
|
|
|
|
XFS_STATS_INC(mp, xs_add_exlist);
|
|
|
|
#define LEFT r[0]
|
|
#define RIGHT r[1]
|
|
#define PREV r[2]
|
|
|
|
/*
|
|
* Set up a bunch of variables to make the tests simpler.
|
|
*/
|
|
xfs_iext_get_extent(ifp, &bma->icur, &PREV);
|
|
new_endoff = new->br_startoff + new->br_blockcount;
|
|
ASSERT(isnullstartblock(PREV.br_startblock));
|
|
ASSERT(PREV.br_startoff <= new->br_startoff);
|
|
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
|
|
|
|
da_old = startblockval(PREV.br_startblock);
|
|
da_new = 0;
|
|
|
|
/*
|
|
* Set flags determining what part of the previous delayed allocation
|
|
* extent is being replaced by a real allocation.
|
|
*/
|
|
if (PREV.br_startoff == new->br_startoff)
|
|
state |= BMAP_LEFT_FILLING;
|
|
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
|
|
state |= BMAP_RIGHT_FILLING;
|
|
|
|
/*
|
|
* Check and set flags if this segment has a left neighbor.
|
|
* Don't set contiguous if the combined extent would be too large.
|
|
*/
|
|
if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) {
|
|
state |= BMAP_LEFT_VALID;
|
|
if (isnullstartblock(LEFT.br_startblock))
|
|
state |= BMAP_LEFT_DELAY;
|
|
}
|
|
|
|
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
|
|
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
|
|
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
|
|
LEFT.br_state == new->br_state &&
|
|
LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
|
|
state |= BMAP_LEFT_CONTIG;
|
|
|
|
/*
|
|
* Check and set flags if this segment has a right neighbor.
|
|
* Don't set contiguous if the combined extent would be too large.
|
|
* Also check for all-three-contiguous being too large.
|
|
*/
|
|
if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) {
|
|
state |= BMAP_RIGHT_VALID;
|
|
if (isnullstartblock(RIGHT.br_startblock))
|
|
state |= BMAP_RIGHT_DELAY;
|
|
}
|
|
|
|
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
|
|
new_endoff == RIGHT.br_startoff &&
|
|
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
|
|
new->br_state == RIGHT.br_state &&
|
|
new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
|
|
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
|
|
BMAP_RIGHT_FILLING)) !=
|
|
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
|
|
BMAP_RIGHT_FILLING) ||
|
|
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
|
|
<= XFS_MAX_BMBT_EXTLEN))
|
|
state |= BMAP_RIGHT_CONTIG;
|
|
|
|
error = 0;
|
|
/*
|
|
* Switch out based on the FILLING and CONTIG state bits.
|
|
*/
|
|
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
|
|
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
|
|
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Filling in all of a previously delayed allocation extent.
|
|
* The left and right neighbors are both contiguous with new.
|
|
*/
|
|
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
|
|
|
|
xfs_iext_remove(bma->ip, &bma->icur, state);
|
|
xfs_iext_remove(bma->ip, &bma->icur, state);
|
|
xfs_iext_prev(ifp, &bma->icur);
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
|
|
ifp->if_nextents--;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_delete(bma->cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_decrement(bma->cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(bma->cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
|
|
/*
|
|
* Filling in all of a previously delayed allocation extent.
|
|
* The left neighbor is contiguous, the right is not.
|
|
*/
|
|
old = LEFT;
|
|
LEFT.br_blockcount += PREV.br_blockcount;
|
|
|
|
xfs_iext_remove(bma->ip, &bma->icur, state);
|
|
xfs_iext_prev(ifp, &bma->icur);
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(bma->cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Filling in all of a previously delayed allocation extent.
|
|
* The right neighbor is contiguous, the left is not. Take care
|
|
* with delay -> unwritten extent allocation here because the
|
|
* delalloc record we are overwriting is always written.
|
|
*/
|
|
PREV.br_startblock = new->br_startblock;
|
|
PREV.br_blockcount += RIGHT.br_blockcount;
|
|
PREV.br_state = new->br_state;
|
|
|
|
xfs_iext_next(ifp, &bma->icur);
|
|
xfs_iext_remove(bma->ip, &bma->icur, state);
|
|
xfs_iext_prev(ifp, &bma->icur);
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(bma->cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Filling in all of a previously delayed allocation extent.
|
|
* Neither the left nor right neighbors are contiguous with
|
|
* the new one.
|
|
*/
|
|
PREV.br_startblock = new->br_startblock;
|
|
PREV.br_state = new->br_state;
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
|
|
ifp->if_nextents++;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_insert(bma->cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
|
|
/*
|
|
* Filling in the first part of a previous delayed allocation.
|
|
* The left neighbor is contiguous.
|
|
*/
|
|
old = LEFT;
|
|
temp = PREV.br_blockcount - new->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
|
|
startblockval(PREV.br_startblock));
|
|
|
|
LEFT.br_blockcount += new->br_blockcount;
|
|
|
|
PREV.br_blockcount = temp;
|
|
PREV.br_startoff += new->br_blockcount;
|
|
PREV.br_startblock = nullstartblock(da_new);
|
|
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
|
|
xfs_iext_prev(ifp, &bma->icur);
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(bma->cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING:
|
|
/*
|
|
* Filling in the first part of a previous delayed allocation.
|
|
* The left neighbor is not contiguous.
|
|
*/
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
|
|
ifp->if_nextents++;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_insert(bma->cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
|
|
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
|
|
&bma->cur, 1, &tmp_rval, whichfork);
|
|
rval |= tmp_rval;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
temp = PREV.br_blockcount - new->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
|
|
startblockval(PREV.br_startblock) -
|
|
(bma->cur ? bma->cur->bc_ino.allocated : 0));
|
|
|
|
PREV.br_startoff = new_endoff;
|
|
PREV.br_blockcount = temp;
|
|
PREV.br_startblock = nullstartblock(da_new);
|
|
xfs_iext_next(ifp, &bma->icur);
|
|
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
|
|
xfs_iext_prev(ifp, &bma->icur);
|
|
break;
|
|
|
|
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Filling in the last part of a previous delayed allocation.
|
|
* The right neighbor is contiguous with the new allocation.
|
|
*/
|
|
old = RIGHT;
|
|
RIGHT.br_startoff = new->br_startoff;
|
|
RIGHT.br_startblock = new->br_startblock;
|
|
RIGHT.br_blockcount += new->br_blockcount;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(bma->cur, &RIGHT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
temp = PREV.br_blockcount - new->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
|
|
startblockval(PREV.br_startblock));
|
|
|
|
PREV.br_blockcount = temp;
|
|
PREV.br_startblock = nullstartblock(da_new);
|
|
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
|
|
xfs_iext_next(ifp, &bma->icur);
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT);
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Filling in the last part of a previous delayed allocation.
|
|
* The right neighbor is not contiguous.
|
|
*/
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
|
|
ifp->if_nextents++;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_insert(bma->cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
|
|
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
|
|
&bma->cur, 1, &tmp_rval, whichfork);
|
|
rval |= tmp_rval;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
temp = PREV.br_blockcount - new->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
|
|
startblockval(PREV.br_startblock) -
|
|
(bma->cur ? bma->cur->bc_ino.allocated : 0));
|
|
|
|
PREV.br_startblock = nullstartblock(da_new);
|
|
PREV.br_blockcount = temp;
|
|
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
|
|
xfs_iext_next(ifp, &bma->icur);
|
|
ASSERT(da_new <= da_old);
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* Filling in the middle part of a previous delayed allocation.
|
|
* Contiguity is impossible here.
|
|
* This case is avoided almost all the time.
|
|
*
|
|
* We start with a delayed allocation:
|
|
*
|
|
* +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
|
|
* PREV @ idx
|
|
*
|
|
* and we are allocating:
|
|
* +rrrrrrrrrrrrrrrrr+
|
|
* new
|
|
*
|
|
* and we set it up for insertion as:
|
|
* +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
|
|
* new
|
|
* PREV @ idx LEFT RIGHT
|
|
* inserted at idx + 1
|
|
*/
|
|
old = PREV;
|
|
|
|
/* LEFT is the new middle */
|
|
LEFT = *new;
|
|
|
|
/* RIGHT is the new right */
|
|
RIGHT.br_state = PREV.br_state;
|
|
RIGHT.br_startoff = new_endoff;
|
|
RIGHT.br_blockcount =
|
|
PREV.br_startoff + PREV.br_blockcount - new_endoff;
|
|
RIGHT.br_startblock =
|
|
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
|
|
RIGHT.br_blockcount));
|
|
|
|
/* truncate PREV */
|
|
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
|
|
PREV.br_startblock =
|
|
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
|
|
PREV.br_blockcount));
|
|
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
|
|
|
|
xfs_iext_next(ifp, &bma->icur);
|
|
xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state);
|
|
xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state);
|
|
ifp->if_nextents++;
|
|
|
|
if (bma->cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_insert(bma->cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
|
|
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
|
|
&bma->cur, 1, &tmp_rval, whichfork);
|
|
rval |= tmp_rval;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
da_new = startblockval(PREV.br_startblock) +
|
|
startblockval(RIGHT.br_startblock);
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
|
|
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
|
|
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_LEFT_CONTIG:
|
|
case BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* These cases are all impossible.
|
|
*/
|
|
ASSERT(0);
|
|
}
|
|
|
|
/* add reverse mapping unless caller opted out */
|
|
if (!(bma->flags & XFS_BMAPI_NORMAP))
|
|
xfs_rmap_map_extent(bma->tp, bma->ip, whichfork, new);
|
|
|
|
/* convert to a btree if necessary */
|
|
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
|
|
int tmp_logflags; /* partial log flag return val */
|
|
|
|
ASSERT(bma->cur == NULL);
|
|
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
|
|
&bma->cur, da_old > 0, &tmp_logflags,
|
|
whichfork);
|
|
bma->logflags |= tmp_logflags;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
if (da_new != da_old)
|
|
xfs_mod_delalloc(mp, (int64_t)da_new - da_old);
|
|
|
|
if (bma->cur) {
|
|
da_new += bma->cur->bc_ino.allocated;
|
|
bma->cur->bc_ino.allocated = 0;
|
|
}
|
|
|
|
/* adjust for changes in reserved delayed indirect blocks */
|
|
if (da_new != da_old)
|
|
error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
|
|
true);
|
|
|
|
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
|
|
done:
|
|
if (whichfork != XFS_COW_FORK)
|
|
bma->logflags |= rval;
|
|
return error;
|
|
#undef LEFT
|
|
#undef RIGHT
|
|
#undef PREV
|
|
}
|
|
|
|
/*
|
|
* Convert an unwritten allocation to a real allocation or vice versa.
|
|
*/
|
|
int /* error */
|
|
xfs_bmap_add_extent_unwritten_real(
|
|
struct xfs_trans *tp,
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
int whichfork,
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_btree_cur **curp, /* if *curp is null, not a btree */
|
|
xfs_bmbt_irec_t *new, /* new data to add to file extents */
|
|
int *logflagsp) /* inode logging flags */
|
|
{
|
|
struct xfs_btree_cur *cur; /* btree cursor */
|
|
int error; /* error return value */
|
|
int i; /* temp state */
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
xfs_fileoff_t new_endoff; /* end offset of new entry */
|
|
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
|
|
/* left is 0, right is 1, prev is 2 */
|
|
int rval=0; /* return value (logging flags) */
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_bmbt_irec old;
|
|
|
|
*logflagsp = 0;
|
|
|
|
cur = *curp;
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
|
|
ASSERT(!isnullstartblock(new->br_startblock));
|
|
|
|
XFS_STATS_INC(mp, xs_add_exlist);
|
|
|
|
#define LEFT r[0]
|
|
#define RIGHT r[1]
|
|
#define PREV r[2]
|
|
|
|
/*
|
|
* Set up a bunch of variables to make the tests simpler.
|
|
*/
|
|
error = 0;
|
|
xfs_iext_get_extent(ifp, icur, &PREV);
|
|
ASSERT(new->br_state != PREV.br_state);
|
|
new_endoff = new->br_startoff + new->br_blockcount;
|
|
ASSERT(PREV.br_startoff <= new->br_startoff);
|
|
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
|
|
|
|
/*
|
|
* Set flags determining what part of the previous oldext allocation
|
|
* extent is being replaced by a newext allocation.
|
|
*/
|
|
if (PREV.br_startoff == new->br_startoff)
|
|
state |= BMAP_LEFT_FILLING;
|
|
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
|
|
state |= BMAP_RIGHT_FILLING;
|
|
|
|
/*
|
|
* Check and set flags if this segment has a left neighbor.
|
|
* Don't set contiguous if the combined extent would be too large.
|
|
*/
|
|
if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) {
|
|
state |= BMAP_LEFT_VALID;
|
|
if (isnullstartblock(LEFT.br_startblock))
|
|
state |= BMAP_LEFT_DELAY;
|
|
}
|
|
|
|
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
|
|
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
|
|
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
|
|
LEFT.br_state == new->br_state &&
|
|
LEFT.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
|
|
state |= BMAP_LEFT_CONTIG;
|
|
|
|
/*
|
|
* Check and set flags if this segment has a right neighbor.
|
|
* Don't set contiguous if the combined extent would be too large.
|
|
* Also check for all-three-contiguous being too large.
|
|
*/
|
|
if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) {
|
|
state |= BMAP_RIGHT_VALID;
|
|
if (isnullstartblock(RIGHT.br_startblock))
|
|
state |= BMAP_RIGHT_DELAY;
|
|
}
|
|
|
|
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
|
|
new_endoff == RIGHT.br_startoff &&
|
|
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
|
|
new->br_state == RIGHT.br_state &&
|
|
new->br_blockcount + RIGHT.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
|
|
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
|
|
BMAP_RIGHT_FILLING)) !=
|
|
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
|
|
BMAP_RIGHT_FILLING) ||
|
|
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
|
|
<= XFS_MAX_BMBT_EXTLEN))
|
|
state |= BMAP_RIGHT_CONTIG;
|
|
|
|
/*
|
|
* Switch out based on the FILLING and CONTIG state bits.
|
|
*/
|
|
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
|
|
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
|
|
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left and right neighbors are both contiguous with new.
|
|
*/
|
|
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
|
|
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &LEFT);
|
|
ifp->if_nextents -= 2;
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_delete(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_decrement(cur, 0, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_delete(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_decrement(cur, 0, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous, the right is not.
|
|
*/
|
|
LEFT.br_blockcount += PREV.br_blockcount;
|
|
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &LEFT);
|
|
ifp->if_nextents--;
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &PREV, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_delete(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_decrement(cur, 0, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous, the left is not.
|
|
*/
|
|
PREV.br_blockcount += RIGHT.br_blockcount;
|
|
PREV.br_state = new->br_state;
|
|
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
ifp->if_nextents--;
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_delete(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_decrement(cur, 0, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* Neither the left nor right neighbors are contiguous with
|
|
* the new one.
|
|
*/
|
|
PREV.br_state = new->br_state;
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous.
|
|
*/
|
|
LEFT.br_blockcount += new->br_blockcount;
|
|
|
|
old = PREV;
|
|
PREV.br_startoff += new->br_blockcount;
|
|
PREV.br_startblock += new->br_blockcount;
|
|
PREV.br_blockcount -= new->br_blockcount;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &LEFT);
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_bmbt_update(cur, &LEFT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is not contiguous.
|
|
*/
|
|
old = PREV;
|
|
PREV.br_startoff += new->br_blockcount;
|
|
PREV.br_startblock += new->br_blockcount;
|
|
PREV.br_blockcount -= new->br_blockcount;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
xfs_iext_insert(ip, icur, new, state);
|
|
ifp->if_nextents++;
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
cur->bc_rec.b = *new;
|
|
if ((error = xfs_btree_insert(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous with the new allocation.
|
|
*/
|
|
old = PREV;
|
|
PREV.br_blockcount -= new->br_blockcount;
|
|
|
|
RIGHT.br_startoff = new->br_startoff;
|
|
RIGHT.br_startblock = new->br_startblock;
|
|
RIGHT.br_blockcount += new->br_blockcount;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &RIGHT);
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_DEXT;
|
|
else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_bmbt_update(cur, &RIGHT);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is not contiguous.
|
|
*/
|
|
old = PREV;
|
|
PREV.br_blockcount -= new->br_blockcount;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_insert(ip, icur, new, state);
|
|
ifp->if_nextents++;
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &PREV);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_bmbt_lookup_eq(cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
if ((error = xfs_btree_insert(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* Setting the middle part of a previous oldext extent to
|
|
* newext. Contiguity is impossible here.
|
|
* One extent becomes three extents.
|
|
*/
|
|
old = PREV;
|
|
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
|
|
|
|
r[0] = *new;
|
|
r[1].br_startoff = new_endoff;
|
|
r[1].br_blockcount =
|
|
old.br_startoff + old.br_blockcount - new_endoff;
|
|
r[1].br_startblock = new->br_startblock + new->br_blockcount;
|
|
r[1].br_state = PREV.br_state;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, &PREV);
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_insert(ip, icur, &r[1], state);
|
|
xfs_iext_insert(ip, icur, &r[0], state);
|
|
ifp->if_nextents += 2;
|
|
|
|
if (cur == NULL)
|
|
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
|
|
else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
/* new right extent - oldext */
|
|
error = xfs_bmbt_update(cur, &r[1]);
|
|
if (error)
|
|
goto done;
|
|
/* new left extent - oldext */
|
|
cur->bc_rec.b = PREV;
|
|
if ((error = xfs_btree_insert(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
/*
|
|
* Reset the cursor to the position of the new extent
|
|
* we are about to insert as we can't trust it after
|
|
* the previous insert.
|
|
*/
|
|
error = xfs_bmbt_lookup_eq(cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
/* new middle extent - newext */
|
|
if ((error = xfs_btree_insert(cur, &i)))
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
|
|
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
|
|
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
case BMAP_LEFT_CONTIG:
|
|
case BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* These cases are all impossible.
|
|
*/
|
|
ASSERT(0);
|
|
}
|
|
|
|
/* update reverse mappings */
|
|
xfs_rmap_convert_extent(mp, tp, ip, whichfork, new);
|
|
|
|
/* convert to a btree if necessary */
|
|
if (xfs_bmap_needs_btree(ip, whichfork)) {
|
|
int tmp_logflags; /* partial log flag return val */
|
|
|
|
ASSERT(cur == NULL);
|
|
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
|
|
&tmp_logflags, whichfork);
|
|
*logflagsp |= tmp_logflags;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
/* clear out the allocated field, done with it now in any case. */
|
|
if (cur) {
|
|
cur->bc_ino.allocated = 0;
|
|
*curp = cur;
|
|
}
|
|
|
|
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
|
|
done:
|
|
*logflagsp |= rval;
|
|
return error;
|
|
#undef LEFT
|
|
#undef RIGHT
|
|
#undef PREV
|
|
}
|
|
|
|
/*
|
|
* Convert a hole to a delayed allocation.
|
|
*/
|
|
STATIC void
|
|
xfs_bmap_add_extent_hole_delay(
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
int whichfork,
|
|
struct xfs_iext_cursor *icur,
|
|
xfs_bmbt_irec_t *new) /* new data to add to file extents */
|
|
{
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
xfs_bmbt_irec_t left; /* left neighbor extent entry */
|
|
xfs_filblks_t newlen=0; /* new indirect size */
|
|
xfs_filblks_t oldlen=0; /* old indirect size */
|
|
xfs_bmbt_irec_t right; /* right neighbor extent entry */
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
xfs_filblks_t temp; /* temp for indirect calculations */
|
|
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
ASSERT(isnullstartblock(new->br_startblock));
|
|
|
|
/*
|
|
* Check and set flags if this segment has a left neighbor
|
|
*/
|
|
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
|
|
state |= BMAP_LEFT_VALID;
|
|
if (isnullstartblock(left.br_startblock))
|
|
state |= BMAP_LEFT_DELAY;
|
|
}
|
|
|
|
/*
|
|
* Check and set flags if the current (right) segment exists.
|
|
* If it doesn't exist, we're converting the hole at end-of-file.
|
|
*/
|
|
if (xfs_iext_get_extent(ifp, icur, &right)) {
|
|
state |= BMAP_RIGHT_VALID;
|
|
if (isnullstartblock(right.br_startblock))
|
|
state |= BMAP_RIGHT_DELAY;
|
|
}
|
|
|
|
/*
|
|
* Set contiguity flags on the left and right neighbors.
|
|
* Don't let extents get too large, even if the pieces are contiguous.
|
|
*/
|
|
if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
|
|
left.br_startoff + left.br_blockcount == new->br_startoff &&
|
|
left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
|
|
state |= BMAP_LEFT_CONTIG;
|
|
|
|
if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
|
|
new->br_startoff + new->br_blockcount == right.br_startoff &&
|
|
new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
|
|
(!(state & BMAP_LEFT_CONTIG) ||
|
|
(left.br_blockcount + new->br_blockcount +
|
|
right.br_blockcount <= XFS_MAX_BMBT_EXTLEN)))
|
|
state |= BMAP_RIGHT_CONTIG;
|
|
|
|
/*
|
|
* Switch out based on the contiguity flags.
|
|
*/
|
|
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
|
|
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with delayed allocations
|
|
* on the left and on the right.
|
|
* Merge all three into a single extent record.
|
|
*/
|
|
temp = left.br_blockcount + new->br_blockcount +
|
|
right.br_blockcount;
|
|
|
|
oldlen = startblockval(left.br_startblock) +
|
|
startblockval(new->br_startblock) +
|
|
startblockval(right.br_startblock);
|
|
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
|
|
oldlen);
|
|
left.br_startblock = nullstartblock(newlen);
|
|
left.br_blockcount = temp;
|
|
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &left);
|
|
break;
|
|
|
|
case BMAP_LEFT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with a delayed allocation
|
|
* on the left.
|
|
* Merge the new allocation with the left neighbor.
|
|
*/
|
|
temp = left.br_blockcount + new->br_blockcount;
|
|
|
|
oldlen = startblockval(left.br_startblock) +
|
|
startblockval(new->br_startblock);
|
|
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
|
|
oldlen);
|
|
left.br_blockcount = temp;
|
|
left.br_startblock = nullstartblock(newlen);
|
|
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &left);
|
|
break;
|
|
|
|
case BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with a delayed allocation
|
|
* on the right.
|
|
* Merge the new allocation with the right neighbor.
|
|
*/
|
|
temp = new->br_blockcount + right.br_blockcount;
|
|
oldlen = startblockval(new->br_startblock) +
|
|
startblockval(right.br_startblock);
|
|
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
|
|
oldlen);
|
|
right.br_startoff = new->br_startoff;
|
|
right.br_startblock = nullstartblock(newlen);
|
|
right.br_blockcount = temp;
|
|
xfs_iext_update_extent(ip, state, icur, &right);
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* New allocation is not contiguous with another
|
|
* delayed allocation.
|
|
* Insert a new entry.
|
|
*/
|
|
oldlen = newlen = 0;
|
|
xfs_iext_insert(ip, icur, new, state);
|
|
break;
|
|
}
|
|
if (oldlen != newlen) {
|
|
ASSERT(oldlen > newlen);
|
|
xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
|
|
false);
|
|
/*
|
|
* Nothing to do for disk quota accounting here.
|
|
*/
|
|
xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert a hole to a real allocation.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_add_extent_hole_real(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_btree_cur **curp,
|
|
struct xfs_bmbt_irec *new,
|
|
int *logflagsp,
|
|
uint32_t flags)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_btree_cur *cur = *curp;
|
|
int error; /* error return value */
|
|
int i; /* temp state */
|
|
xfs_bmbt_irec_t left; /* left neighbor extent entry */
|
|
xfs_bmbt_irec_t right; /* right neighbor extent entry */
|
|
int rval=0; /* return value (logging flags) */
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
struct xfs_bmbt_irec old;
|
|
|
|
ASSERT(!isnullstartblock(new->br_startblock));
|
|
ASSERT(!cur || !(cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
|
|
|
|
XFS_STATS_INC(mp, xs_add_exlist);
|
|
|
|
/*
|
|
* Check and set flags if this segment has a left neighbor.
|
|
*/
|
|
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
|
|
state |= BMAP_LEFT_VALID;
|
|
if (isnullstartblock(left.br_startblock))
|
|
state |= BMAP_LEFT_DELAY;
|
|
}
|
|
|
|
/*
|
|
* Check and set flags if this segment has a current value.
|
|
* Not true if we're inserting into the "hole" at eof.
|
|
*/
|
|
if (xfs_iext_get_extent(ifp, icur, &right)) {
|
|
state |= BMAP_RIGHT_VALID;
|
|
if (isnullstartblock(right.br_startblock))
|
|
state |= BMAP_RIGHT_DELAY;
|
|
}
|
|
|
|
/*
|
|
* We're inserting a real allocation between "left" and "right".
|
|
* Set the contiguity flags. Don't let extents get too large.
|
|
*/
|
|
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
|
|
left.br_startoff + left.br_blockcount == new->br_startoff &&
|
|
left.br_startblock + left.br_blockcount == new->br_startblock &&
|
|
left.br_state == new->br_state &&
|
|
left.br_blockcount + new->br_blockcount <= XFS_MAX_BMBT_EXTLEN)
|
|
state |= BMAP_LEFT_CONTIG;
|
|
|
|
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
|
|
new->br_startoff + new->br_blockcount == right.br_startoff &&
|
|
new->br_startblock + new->br_blockcount == right.br_startblock &&
|
|
new->br_state == right.br_state &&
|
|
new->br_blockcount + right.br_blockcount <= XFS_MAX_BMBT_EXTLEN &&
|
|
(!(state & BMAP_LEFT_CONTIG) ||
|
|
left.br_blockcount + new->br_blockcount +
|
|
right.br_blockcount <= XFS_MAX_BMBT_EXTLEN))
|
|
state |= BMAP_RIGHT_CONTIG;
|
|
|
|
error = 0;
|
|
/*
|
|
* Select which case we're in here, and implement it.
|
|
*/
|
|
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
|
|
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with real allocations on the
|
|
* left and on the right.
|
|
* Merge all three into a single extent record.
|
|
*/
|
|
left.br_blockcount += new->br_blockcount + right.br_blockcount;
|
|
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &left);
|
|
ifp->if_nextents--;
|
|
|
|
if (cur == NULL) {
|
|
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
|
|
} else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, &right, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &left);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_LEFT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with a real allocation
|
|
* on the left.
|
|
* Merge the new allocation with the left neighbor.
|
|
*/
|
|
old = left;
|
|
left.br_blockcount += new->br_blockcount;
|
|
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, state, icur, &left);
|
|
|
|
if (cur == NULL) {
|
|
rval = xfs_ilog_fext(whichfork);
|
|
} else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &left);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case BMAP_RIGHT_CONTIG:
|
|
/*
|
|
* New allocation is contiguous with a real allocation
|
|
* on the right.
|
|
* Merge the new allocation with the right neighbor.
|
|
*/
|
|
old = right;
|
|
|
|
right.br_startoff = new->br_startoff;
|
|
right.br_startblock = new->br_startblock;
|
|
right.br_blockcount += new->br_blockcount;
|
|
xfs_iext_update_extent(ip, state, icur, &right);
|
|
|
|
if (cur == NULL) {
|
|
rval = xfs_ilog_fext(whichfork);
|
|
} else {
|
|
rval = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, &old, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_bmbt_update(cur, &right);
|
|
if (error)
|
|
goto done;
|
|
}
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* New allocation is not contiguous with another
|
|
* real allocation.
|
|
* Insert a new entry.
|
|
*/
|
|
xfs_iext_insert(ip, icur, new, state);
|
|
ifp->if_nextents++;
|
|
|
|
if (cur == NULL) {
|
|
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
|
|
} else {
|
|
rval = XFS_ILOG_CORE;
|
|
error = xfs_bmbt_lookup_eq(cur, new, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto done;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* add reverse mapping unless caller opted out */
|
|
if (!(flags & XFS_BMAPI_NORMAP))
|
|
xfs_rmap_map_extent(tp, ip, whichfork, new);
|
|
|
|
/* convert to a btree if necessary */
|
|
if (xfs_bmap_needs_btree(ip, whichfork)) {
|
|
int tmp_logflags; /* partial log flag return val */
|
|
|
|
ASSERT(cur == NULL);
|
|
error = xfs_bmap_extents_to_btree(tp, ip, curp, 0,
|
|
&tmp_logflags, whichfork);
|
|
*logflagsp |= tmp_logflags;
|
|
cur = *curp;
|
|
if (error)
|
|
goto done;
|
|
}
|
|
|
|
/* clear out the allocated field, done with it now in any case. */
|
|
if (cur)
|
|
cur->bc_ino.allocated = 0;
|
|
|
|
xfs_bmap_check_leaf_extents(cur, ip, whichfork);
|
|
done:
|
|
*logflagsp |= rval;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Functions used in the extent read, allocate and remove paths
|
|
*/
|
|
|
|
/*
|
|
* Adjust the size of the new extent based on i_extsize and rt extsize.
|
|
*/
|
|
int
|
|
xfs_bmap_extsize_align(
|
|
xfs_mount_t *mp,
|
|
xfs_bmbt_irec_t *gotp, /* next extent pointer */
|
|
xfs_bmbt_irec_t *prevp, /* previous extent pointer */
|
|
xfs_extlen_t extsz, /* align to this extent size */
|
|
int rt, /* is this a realtime inode? */
|
|
int eof, /* is extent at end-of-file? */
|
|
int delay, /* creating delalloc extent? */
|
|
int convert, /* overwriting unwritten extent? */
|
|
xfs_fileoff_t *offp, /* in/out: aligned offset */
|
|
xfs_extlen_t *lenp) /* in/out: aligned length */
|
|
{
|
|
xfs_fileoff_t orig_off; /* original offset */
|
|
xfs_extlen_t orig_alen; /* original length */
|
|
xfs_fileoff_t orig_end; /* original off+len */
|
|
xfs_fileoff_t nexto; /* next file offset */
|
|
xfs_fileoff_t prevo; /* previous file offset */
|
|
xfs_fileoff_t align_off; /* temp for offset */
|
|
xfs_extlen_t align_alen; /* temp for length */
|
|
xfs_extlen_t temp; /* temp for calculations */
|
|
|
|
if (convert)
|
|
return 0;
|
|
|
|
orig_off = align_off = *offp;
|
|
orig_alen = align_alen = *lenp;
|
|
orig_end = orig_off + orig_alen;
|
|
|
|
/*
|
|
* If this request overlaps an existing extent, then don't
|
|
* attempt to perform any additional alignment.
|
|
*/
|
|
if (!delay && !eof &&
|
|
(orig_off >= gotp->br_startoff) &&
|
|
(orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If the file offset is unaligned vs. the extent size
|
|
* we need to align it. This will be possible unless
|
|
* the file was previously written with a kernel that didn't
|
|
* perform this alignment, or if a truncate shot us in the
|
|
* foot.
|
|
*/
|
|
div_u64_rem(orig_off, extsz, &temp);
|
|
if (temp) {
|
|
align_alen += temp;
|
|
align_off -= temp;
|
|
}
|
|
|
|
/* Same adjustment for the end of the requested area. */
|
|
temp = (align_alen % extsz);
|
|
if (temp)
|
|
align_alen += extsz - temp;
|
|
|
|
/*
|
|
* For large extent hint sizes, the aligned extent might be larger than
|
|
* XFS_BMBT_MAX_EXTLEN. In that case, reduce the size by an extsz so
|
|
* that it pulls the length back under XFS_BMBT_MAX_EXTLEN. The outer
|
|
* allocation loops handle short allocation just fine, so it is safe to
|
|
* do this. We only want to do it when we are forced to, though, because
|
|
* it means more allocation operations are required.
|
|
*/
|
|
while (align_alen > XFS_MAX_BMBT_EXTLEN)
|
|
align_alen -= extsz;
|
|
ASSERT(align_alen <= XFS_MAX_BMBT_EXTLEN);
|
|
|
|
/*
|
|
* If the previous block overlaps with this proposed allocation
|
|
* then move the start forward without adjusting the length.
|
|
*/
|
|
if (prevp->br_startoff != NULLFILEOFF) {
|
|
if (prevp->br_startblock == HOLESTARTBLOCK)
|
|
prevo = prevp->br_startoff;
|
|
else
|
|
prevo = prevp->br_startoff + prevp->br_blockcount;
|
|
} else
|
|
prevo = 0;
|
|
if (align_off != orig_off && align_off < prevo)
|
|
align_off = prevo;
|
|
/*
|
|
* If the next block overlaps with this proposed allocation
|
|
* then move the start back without adjusting the length,
|
|
* but not before offset 0.
|
|
* This may of course make the start overlap previous block,
|
|
* and if we hit the offset 0 limit then the next block
|
|
* can still overlap too.
|
|
*/
|
|
if (!eof && gotp->br_startoff != NULLFILEOFF) {
|
|
if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
|
|
(!delay && gotp->br_startblock == DELAYSTARTBLOCK))
|
|
nexto = gotp->br_startoff + gotp->br_blockcount;
|
|
else
|
|
nexto = gotp->br_startoff;
|
|
} else
|
|
nexto = NULLFILEOFF;
|
|
if (!eof &&
|
|
align_off + align_alen != orig_end &&
|
|
align_off + align_alen > nexto)
|
|
align_off = nexto > align_alen ? nexto - align_alen : 0;
|
|
/*
|
|
* If we're now overlapping the next or previous extent that
|
|
* means we can't fit an extsz piece in this hole. Just move
|
|
* the start forward to the first valid spot and set
|
|
* the length so we hit the end.
|
|
*/
|
|
if (align_off != orig_off && align_off < prevo)
|
|
align_off = prevo;
|
|
if (align_off + align_alen != orig_end &&
|
|
align_off + align_alen > nexto &&
|
|
nexto != NULLFILEOFF) {
|
|
ASSERT(nexto > prevo);
|
|
align_alen = nexto - align_off;
|
|
}
|
|
|
|
/*
|
|
* If realtime, and the result isn't a multiple of the realtime
|
|
* extent size we need to remove blocks until it is.
|
|
*/
|
|
if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
|
|
/*
|
|
* We're not covering the original request, or
|
|
* we won't be able to once we fix the length.
|
|
*/
|
|
if (orig_off < align_off ||
|
|
orig_end > align_off + align_alen ||
|
|
align_alen - temp < orig_alen)
|
|
return -EINVAL;
|
|
/*
|
|
* Try to fix it by moving the start up.
|
|
*/
|
|
if (align_off + temp <= orig_off) {
|
|
align_alen -= temp;
|
|
align_off += temp;
|
|
}
|
|
/*
|
|
* Try to fix it by moving the end in.
|
|
*/
|
|
else if (align_off + align_alen - temp >= orig_end)
|
|
align_alen -= temp;
|
|
/*
|
|
* Set the start to the minimum then trim the length.
|
|
*/
|
|
else {
|
|
align_alen -= orig_off - align_off;
|
|
align_off = orig_off;
|
|
align_alen -= align_alen % mp->m_sb.sb_rextsize;
|
|
}
|
|
/*
|
|
* Result doesn't cover the request, fail it.
|
|
*/
|
|
if (orig_off < align_off || orig_end > align_off + align_alen)
|
|
return -EINVAL;
|
|
} else {
|
|
ASSERT(orig_off >= align_off);
|
|
/* see XFS_BMBT_MAX_EXTLEN handling above */
|
|
ASSERT(orig_end <= align_off + align_alen ||
|
|
align_alen + extsz > XFS_MAX_BMBT_EXTLEN);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (!eof && gotp->br_startoff != NULLFILEOFF)
|
|
ASSERT(align_off + align_alen <= gotp->br_startoff);
|
|
if (prevp->br_startoff != NULLFILEOFF)
|
|
ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
|
|
#endif
|
|
|
|
*lenp = align_alen;
|
|
*offp = align_off;
|
|
return 0;
|
|
}
|
|
|
|
#define XFS_ALLOC_GAP_UNITS 4
|
|
|
|
void
|
|
xfs_bmap_adjacent(
|
|
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
|
|
{
|
|
xfs_fsblock_t adjust; /* adjustment to block numbers */
|
|
xfs_mount_t *mp; /* mount point structure */
|
|
int rt; /* true if inode is realtime */
|
|
|
|
#define ISVALID(x,y) \
|
|
(rt ? \
|
|
(x) < mp->m_sb.sb_rblocks : \
|
|
XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
|
|
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
|
|
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
|
|
|
|
mp = ap->ip->i_mount;
|
|
rt = XFS_IS_REALTIME_INODE(ap->ip) &&
|
|
(ap->datatype & XFS_ALLOC_USERDATA);
|
|
/*
|
|
* If allocating at eof, and there's a previous real block,
|
|
* try to use its last block as our starting point.
|
|
*/
|
|
if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
|
|
!isnullstartblock(ap->prev.br_startblock) &&
|
|
ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
|
|
ap->prev.br_startblock)) {
|
|
ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
|
|
/*
|
|
* Adjust for the gap between prevp and us.
|
|
*/
|
|
adjust = ap->offset -
|
|
(ap->prev.br_startoff + ap->prev.br_blockcount);
|
|
if (adjust &&
|
|
ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
|
|
ap->blkno += adjust;
|
|
}
|
|
/*
|
|
* If not at eof, then compare the two neighbor blocks.
|
|
* Figure out whether either one gives us a good starting point,
|
|
* and pick the better one.
|
|
*/
|
|
else if (!ap->eof) {
|
|
xfs_fsblock_t gotbno; /* right side block number */
|
|
xfs_fsblock_t gotdiff=0; /* right side difference */
|
|
xfs_fsblock_t prevbno; /* left side block number */
|
|
xfs_fsblock_t prevdiff=0; /* left side difference */
|
|
|
|
/*
|
|
* If there's a previous (left) block, select a requested
|
|
* start block based on it.
|
|
*/
|
|
if (ap->prev.br_startoff != NULLFILEOFF &&
|
|
!isnullstartblock(ap->prev.br_startblock) &&
|
|
(prevbno = ap->prev.br_startblock +
|
|
ap->prev.br_blockcount) &&
|
|
ISVALID(prevbno, ap->prev.br_startblock)) {
|
|
/*
|
|
* Calculate gap to end of previous block.
|
|
*/
|
|
adjust = prevdiff = ap->offset -
|
|
(ap->prev.br_startoff +
|
|
ap->prev.br_blockcount);
|
|
/*
|
|
* Figure the startblock based on the previous block's
|
|
* end and the gap size.
|
|
* Heuristic!
|
|
* If the gap is large relative to the piece we're
|
|
* allocating, or using it gives us an invalid block
|
|
* number, then just use the end of the previous block.
|
|
*/
|
|
if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
|
|
ISVALID(prevbno + prevdiff,
|
|
ap->prev.br_startblock))
|
|
prevbno += adjust;
|
|
else
|
|
prevdiff += adjust;
|
|
}
|
|
/*
|
|
* No previous block or can't follow it, just default.
|
|
*/
|
|
else
|
|
prevbno = NULLFSBLOCK;
|
|
/*
|
|
* If there's a following (right) block, select a requested
|
|
* start block based on it.
|
|
*/
|
|
if (!isnullstartblock(ap->got.br_startblock)) {
|
|
/*
|
|
* Calculate gap to start of next block.
|
|
*/
|
|
adjust = gotdiff = ap->got.br_startoff - ap->offset;
|
|
/*
|
|
* Figure the startblock based on the next block's
|
|
* start and the gap size.
|
|
*/
|
|
gotbno = ap->got.br_startblock;
|
|
/*
|
|
* Heuristic!
|
|
* If the gap is large relative to the piece we're
|
|
* allocating, or using it gives us an invalid block
|
|
* number, then just use the start of the next block
|
|
* offset by our length.
|
|
*/
|
|
if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
|
|
ISVALID(gotbno - gotdiff, gotbno))
|
|
gotbno -= adjust;
|
|
else if (ISVALID(gotbno - ap->length, gotbno)) {
|
|
gotbno -= ap->length;
|
|
gotdiff += adjust - ap->length;
|
|
} else
|
|
gotdiff += adjust;
|
|
}
|
|
/*
|
|
* No next block, just default.
|
|
*/
|
|
else
|
|
gotbno = NULLFSBLOCK;
|
|
/*
|
|
* If both valid, pick the better one, else the only good
|
|
* one, else ap->blkno is already set (to 0 or the inode block).
|
|
*/
|
|
if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
|
|
ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
|
|
else if (prevbno != NULLFSBLOCK)
|
|
ap->blkno = prevbno;
|
|
else if (gotbno != NULLFSBLOCK)
|
|
ap->blkno = gotbno;
|
|
}
|
|
#undef ISVALID
|
|
}
|
|
|
|
int
|
|
xfs_bmap_longest_free_extent(
|
|
struct xfs_perag *pag,
|
|
struct xfs_trans *tp,
|
|
xfs_extlen_t *blen)
|
|
{
|
|
xfs_extlen_t longest;
|
|
int error = 0;
|
|
|
|
if (!xfs_perag_initialised_agf(pag)) {
|
|
error = xfs_alloc_read_agf(pag, tp, XFS_ALLOC_FLAG_TRYLOCK,
|
|
NULL);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
longest = xfs_alloc_longest_free_extent(pag,
|
|
xfs_alloc_min_freelist(pag->pag_mount, pag),
|
|
xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
|
|
if (*blen < longest)
|
|
*blen = longest;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static xfs_extlen_t
|
|
xfs_bmap_select_minlen(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
xfs_extlen_t blen)
|
|
{
|
|
|
|
/*
|
|
* Since we used XFS_ALLOC_FLAG_TRYLOCK in _longest_free_extent(), it is
|
|
* possible that there is enough contiguous free space for this request.
|
|
*/
|
|
if (blen < ap->minlen)
|
|
return ap->minlen;
|
|
|
|
/*
|
|
* If the best seen length is less than the request length,
|
|
* use the best as the minimum, otherwise we've got the maxlen we
|
|
* were asked for.
|
|
*/
|
|
if (blen < args->maxlen)
|
|
return blen;
|
|
return args->maxlen;
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_btalloc_select_lengths(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
xfs_extlen_t *blen)
|
|
{
|
|
struct xfs_mount *mp = args->mp;
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t agno, startag;
|
|
int error = 0;
|
|
|
|
if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
|
|
args->total = ap->minlen;
|
|
args->minlen = ap->minlen;
|
|
return 0;
|
|
}
|
|
|
|
args->total = ap->total;
|
|
startag = XFS_FSB_TO_AGNO(mp, ap->blkno);
|
|
if (startag == NULLAGNUMBER)
|
|
startag = 0;
|
|
|
|
*blen = 0;
|
|
for_each_perag_wrap(mp, startag, agno, pag) {
|
|
error = xfs_bmap_longest_free_extent(pag, args->tp, blen);
|
|
if (error && error != -EAGAIN)
|
|
break;
|
|
error = 0;
|
|
if (*blen >= args->maxlen)
|
|
break;
|
|
}
|
|
if (pag)
|
|
xfs_perag_rele(pag);
|
|
|
|
args->minlen = xfs_bmap_select_minlen(ap, args, *blen);
|
|
return error;
|
|
}
|
|
|
|
/* Update all inode and quota accounting for the allocation we just did. */
|
|
static void
|
|
xfs_bmap_btalloc_accounting(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args)
|
|
{
|
|
if (ap->flags & XFS_BMAPI_COWFORK) {
|
|
/*
|
|
* COW fork blocks are in-core only and thus are treated as
|
|
* in-core quota reservation (like delalloc blocks) even when
|
|
* converted to real blocks. The quota reservation is not
|
|
* accounted to disk until blocks are remapped to the data
|
|
* fork. So if these blocks were previously delalloc, we
|
|
* already have quota reservation and there's nothing to do
|
|
* yet.
|
|
*/
|
|
if (ap->wasdel) {
|
|
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Otherwise, we've allocated blocks in a hole. The transaction
|
|
* has acquired in-core quota reservation for this extent.
|
|
* Rather than account these as real blocks, however, we reduce
|
|
* the transaction quota reservation based on the allocation.
|
|
* This essentially transfers the transaction quota reservation
|
|
* to that of a delalloc extent.
|
|
*/
|
|
ap->ip->i_delayed_blks += args->len;
|
|
xfs_trans_mod_dquot_byino(ap->tp, ap->ip, XFS_TRANS_DQ_RES_BLKS,
|
|
-(long)args->len);
|
|
return;
|
|
}
|
|
|
|
/* data/attr fork only */
|
|
ap->ip->i_nblocks += args->len;
|
|
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
|
|
if (ap->wasdel) {
|
|
ap->ip->i_delayed_blks -= args->len;
|
|
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
|
|
}
|
|
xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
|
|
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : XFS_TRANS_DQ_BCOUNT,
|
|
args->len);
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_compute_alignments(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args)
|
|
{
|
|
struct xfs_mount *mp = args->mp;
|
|
xfs_extlen_t align = 0; /* minimum allocation alignment */
|
|
int stripe_align = 0;
|
|
|
|
/* stripe alignment for allocation is determined by mount parameters */
|
|
if (mp->m_swidth && xfs_has_swalloc(mp))
|
|
stripe_align = mp->m_swidth;
|
|
else if (mp->m_dalign)
|
|
stripe_align = mp->m_dalign;
|
|
|
|
if (ap->flags & XFS_BMAPI_COWFORK)
|
|
align = xfs_get_cowextsz_hint(ap->ip);
|
|
else if (ap->datatype & XFS_ALLOC_USERDATA)
|
|
align = xfs_get_extsz_hint(ap->ip);
|
|
if (align) {
|
|
if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0,
|
|
ap->eof, 0, ap->conv, &ap->offset,
|
|
&ap->length))
|
|
ASSERT(0);
|
|
ASSERT(ap->length);
|
|
}
|
|
|
|
/* apply extent size hints if obtained earlier */
|
|
if (align) {
|
|
args->prod = align;
|
|
div_u64_rem(ap->offset, args->prod, &args->mod);
|
|
if (args->mod)
|
|
args->mod = args->prod - args->mod;
|
|
} else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
|
|
args->prod = 1;
|
|
args->mod = 0;
|
|
} else {
|
|
args->prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
|
|
div_u64_rem(ap->offset, args->prod, &args->mod);
|
|
if (args->mod)
|
|
args->mod = args->prod - args->mod;
|
|
}
|
|
|
|
return stripe_align;
|
|
}
|
|
|
|
static void
|
|
xfs_bmap_process_allocated_extent(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
xfs_fileoff_t orig_offset,
|
|
xfs_extlen_t orig_length)
|
|
{
|
|
ap->blkno = args->fsbno;
|
|
ap->length = args->len;
|
|
/*
|
|
* If the extent size hint is active, we tried to round the
|
|
* caller's allocation request offset down to extsz and the
|
|
* length up to another extsz boundary. If we found a free
|
|
* extent we mapped it in starting at this new offset. If the
|
|
* newly mapped space isn't long enough to cover any of the
|
|
* range of offsets that was originally requested, move the
|
|
* mapping up so that we can fill as much of the caller's
|
|
* original request as possible. Free space is apparently
|
|
* very fragmented so we're unlikely to be able to satisfy the
|
|
* hints anyway.
|
|
*/
|
|
if (ap->length <= orig_length)
|
|
ap->offset = orig_offset;
|
|
else if (ap->offset + ap->length < orig_offset + orig_length)
|
|
ap->offset = orig_offset + orig_length - ap->length;
|
|
xfs_bmap_btalloc_accounting(ap, args);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static int
|
|
xfs_bmap_exact_minlen_extent_alloc(
|
|
struct xfs_bmalloca *ap)
|
|
{
|
|
struct xfs_mount *mp = ap->ip->i_mount;
|
|
struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp };
|
|
xfs_fileoff_t orig_offset;
|
|
xfs_extlen_t orig_length;
|
|
int error;
|
|
|
|
ASSERT(ap->length);
|
|
|
|
if (ap->minlen != 1) {
|
|
ap->blkno = NULLFSBLOCK;
|
|
ap->length = 0;
|
|
return 0;
|
|
}
|
|
|
|
orig_offset = ap->offset;
|
|
orig_length = ap->length;
|
|
|
|
args.alloc_minlen_only = 1;
|
|
|
|
xfs_bmap_compute_alignments(ap, &args);
|
|
|
|
/*
|
|
* Unlike the longest extent available in an AG, we don't track
|
|
* the length of an AG's shortest extent.
|
|
* XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT is a debug only knob and
|
|
* hence we can afford to start traversing from the 0th AG since
|
|
* we need not be concerned about a drop in performance in
|
|
* "debug only" code paths.
|
|
*/
|
|
ap->blkno = XFS_AGB_TO_FSB(mp, 0, 0);
|
|
|
|
args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
|
|
args.minlen = args.maxlen = ap->minlen;
|
|
args.total = ap->total;
|
|
|
|
args.alignment = 1;
|
|
args.minalignslop = 0;
|
|
|
|
args.minleft = ap->minleft;
|
|
args.wasdel = ap->wasdel;
|
|
args.resv = XFS_AG_RESV_NONE;
|
|
args.datatype = ap->datatype;
|
|
|
|
error = xfs_alloc_vextent_first_ag(&args, ap->blkno);
|
|
if (error)
|
|
return error;
|
|
|
|
if (args.fsbno != NULLFSBLOCK) {
|
|
xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
|
|
orig_length);
|
|
} else {
|
|
ap->blkno = NULLFSBLOCK;
|
|
ap->length = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
|
|
#define xfs_bmap_exact_minlen_extent_alloc(bma) (-EFSCORRUPTED)
|
|
|
|
#endif
|
|
|
|
/*
|
|
* If we are not low on available data blocks and we are allocating at
|
|
* EOF, optimise allocation for contiguous file extension and/or stripe
|
|
* alignment of the new extent.
|
|
*
|
|
* NOTE: ap->aeof is only set if the allocation length is >= the
|
|
* stripe unit and the allocation offset is at the end of file.
|
|
*/
|
|
static int
|
|
xfs_bmap_btalloc_at_eof(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
xfs_extlen_t blen,
|
|
int stripe_align,
|
|
bool ag_only)
|
|
{
|
|
struct xfs_mount *mp = args->mp;
|
|
struct xfs_perag *caller_pag = args->pag;
|
|
int error;
|
|
|
|
/*
|
|
* If there are already extents in the file, try an exact EOF block
|
|
* allocation to extend the file as a contiguous extent. If that fails,
|
|
* or it's the first allocation in a file, just try for a stripe aligned
|
|
* allocation.
|
|
*/
|
|
if (ap->offset) {
|
|
xfs_extlen_t nextminlen = 0;
|
|
|
|
/*
|
|
* Compute the minlen+alignment for the next case. Set slop so
|
|
* that the value of minlen+alignment+slop doesn't go up between
|
|
* the calls.
|
|
*/
|
|
args->alignment = 1;
|
|
if (blen > stripe_align && blen <= args->maxlen)
|
|
nextminlen = blen - stripe_align;
|
|
else
|
|
nextminlen = args->minlen;
|
|
if (nextminlen + stripe_align > args->minlen + 1)
|
|
args->minalignslop = nextminlen + stripe_align -
|
|
args->minlen - 1;
|
|
else
|
|
args->minalignslop = 0;
|
|
|
|
if (!caller_pag)
|
|
args->pag = xfs_perag_get(mp, XFS_FSB_TO_AGNO(mp, ap->blkno));
|
|
error = xfs_alloc_vextent_exact_bno(args, ap->blkno);
|
|
if (!caller_pag) {
|
|
xfs_perag_put(args->pag);
|
|
args->pag = NULL;
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
if (args->fsbno != NULLFSBLOCK)
|
|
return 0;
|
|
/*
|
|
* Exact allocation failed. Reset to try an aligned allocation
|
|
* according to the original allocation specification.
|
|
*/
|
|
args->alignment = stripe_align;
|
|
args->minlen = nextminlen;
|
|
args->minalignslop = 0;
|
|
} else {
|
|
/*
|
|
* Adjust minlen to try and preserve alignment if we
|
|
* can't guarantee an aligned maxlen extent.
|
|
*/
|
|
args->alignment = stripe_align;
|
|
if (blen > args->alignment &&
|
|
blen <= args->maxlen + args->alignment)
|
|
args->minlen = blen - args->alignment;
|
|
args->minalignslop = 0;
|
|
}
|
|
|
|
if (ag_only) {
|
|
error = xfs_alloc_vextent_near_bno(args, ap->blkno);
|
|
} else {
|
|
args->pag = NULL;
|
|
error = xfs_alloc_vextent_start_ag(args, ap->blkno);
|
|
ASSERT(args->pag == NULL);
|
|
args->pag = caller_pag;
|
|
}
|
|
if (error)
|
|
return error;
|
|
|
|
if (args->fsbno != NULLFSBLOCK)
|
|
return 0;
|
|
|
|
/*
|
|
* Allocation failed, so turn return the allocation args to their
|
|
* original non-aligned state so the caller can proceed on allocation
|
|
* failure as if this function was never called.
|
|
*/
|
|
args->alignment = 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We have failed multiple allocation attempts so now are in a low space
|
|
* allocation situation. Try a locality first full filesystem minimum length
|
|
* allocation whilst still maintaining necessary total block reservation
|
|
* requirements.
|
|
*
|
|
* If that fails, we are now critically low on space, so perform a last resort
|
|
* allocation attempt: no reserve, no locality, blocking, minimum length, full
|
|
* filesystem free space scan. We also indicate to future allocations in this
|
|
* transaction that we are critically low on space so they don't waste time on
|
|
* allocation modes that are unlikely to succeed.
|
|
*/
|
|
int
|
|
xfs_bmap_btalloc_low_space(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args)
|
|
{
|
|
int error;
|
|
|
|
if (args->minlen > ap->minlen) {
|
|
args->minlen = ap->minlen;
|
|
error = xfs_alloc_vextent_start_ag(args, ap->blkno);
|
|
if (error || args->fsbno != NULLFSBLOCK)
|
|
return error;
|
|
}
|
|
|
|
/* Last ditch attempt before failure is declared. */
|
|
args->total = ap->minlen;
|
|
error = xfs_alloc_vextent_first_ag(args, 0);
|
|
if (error)
|
|
return error;
|
|
ap->tp->t_flags |= XFS_TRANS_LOWMODE;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_btalloc_filestreams(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
int stripe_align)
|
|
{
|
|
xfs_extlen_t blen = 0;
|
|
int error = 0;
|
|
|
|
|
|
error = xfs_filestream_select_ag(ap, args, &blen);
|
|
if (error)
|
|
return error;
|
|
ASSERT(args->pag);
|
|
|
|
/*
|
|
* If we are in low space mode, then optimal allocation will fail so
|
|
* prepare for minimal allocation and jump to the low space algorithm
|
|
* immediately.
|
|
*/
|
|
if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
|
|
args->minlen = ap->minlen;
|
|
ASSERT(args->fsbno == NULLFSBLOCK);
|
|
goto out_low_space;
|
|
}
|
|
|
|
args->minlen = xfs_bmap_select_minlen(ap, args, blen);
|
|
if (ap->aeof)
|
|
error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align,
|
|
true);
|
|
|
|
if (!error && args->fsbno == NULLFSBLOCK)
|
|
error = xfs_alloc_vextent_near_bno(args, ap->blkno);
|
|
|
|
out_low_space:
|
|
/*
|
|
* We are now done with the perag reference for the filestreams
|
|
* association provided by xfs_filestream_select_ag(). Release it now as
|
|
* we've either succeeded, had a fatal error or we are out of space and
|
|
* need to do a full filesystem scan for free space which will take it's
|
|
* own references.
|
|
*/
|
|
xfs_perag_rele(args->pag);
|
|
args->pag = NULL;
|
|
if (error || args->fsbno != NULLFSBLOCK)
|
|
return error;
|
|
|
|
return xfs_bmap_btalloc_low_space(ap, args);
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_btalloc_best_length(
|
|
struct xfs_bmalloca *ap,
|
|
struct xfs_alloc_arg *args,
|
|
int stripe_align)
|
|
{
|
|
xfs_extlen_t blen = 0;
|
|
int error;
|
|
|
|
ap->blkno = XFS_INO_TO_FSB(args->mp, ap->ip->i_ino);
|
|
xfs_bmap_adjacent(ap);
|
|
|
|
/*
|
|
* Search for an allocation group with a single extent large enough for
|
|
* the request. If one isn't found, then adjust the minimum allocation
|
|
* size to the largest space found.
|
|
*/
|
|
error = xfs_bmap_btalloc_select_lengths(ap, args, &blen);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Don't attempt optimal EOF allocation if previous allocations barely
|
|
* succeeded due to being near ENOSPC. It is highly unlikely we'll get
|
|
* optimal or even aligned allocations in this case, so don't waste time
|
|
* trying.
|
|
*/
|
|
if (ap->aeof && !(ap->tp->t_flags & XFS_TRANS_LOWMODE)) {
|
|
error = xfs_bmap_btalloc_at_eof(ap, args, blen, stripe_align,
|
|
false);
|
|
if (error || args->fsbno != NULLFSBLOCK)
|
|
return error;
|
|
}
|
|
|
|
error = xfs_alloc_vextent_start_ag(args, ap->blkno);
|
|
if (error || args->fsbno != NULLFSBLOCK)
|
|
return error;
|
|
|
|
return xfs_bmap_btalloc_low_space(ap, args);
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_btalloc(
|
|
struct xfs_bmalloca *ap)
|
|
{
|
|
struct xfs_mount *mp = ap->ip->i_mount;
|
|
struct xfs_alloc_arg args = {
|
|
.tp = ap->tp,
|
|
.mp = mp,
|
|
.fsbno = NULLFSBLOCK,
|
|
.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE,
|
|
.minleft = ap->minleft,
|
|
.wasdel = ap->wasdel,
|
|
.resv = XFS_AG_RESV_NONE,
|
|
.datatype = ap->datatype,
|
|
.alignment = 1,
|
|
.minalignslop = 0,
|
|
};
|
|
xfs_fileoff_t orig_offset;
|
|
xfs_extlen_t orig_length;
|
|
int error;
|
|
int stripe_align;
|
|
|
|
ASSERT(ap->length);
|
|
orig_offset = ap->offset;
|
|
orig_length = ap->length;
|
|
|
|
stripe_align = xfs_bmap_compute_alignments(ap, &args);
|
|
|
|
/* Trim the allocation back to the maximum an AG can fit. */
|
|
args.maxlen = min(ap->length, mp->m_ag_max_usable);
|
|
|
|
if ((ap->datatype & XFS_ALLOC_USERDATA) &&
|
|
xfs_inode_is_filestream(ap->ip))
|
|
error = xfs_bmap_btalloc_filestreams(ap, &args, stripe_align);
|
|
else
|
|
error = xfs_bmap_btalloc_best_length(ap, &args, stripe_align);
|
|
if (error)
|
|
return error;
|
|
|
|
if (args.fsbno != NULLFSBLOCK) {
|
|
xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
|
|
orig_length);
|
|
} else {
|
|
ap->blkno = NULLFSBLOCK;
|
|
ap->length = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Trim extent to fit a logical block range. */
|
|
void
|
|
xfs_trim_extent(
|
|
struct xfs_bmbt_irec *irec,
|
|
xfs_fileoff_t bno,
|
|
xfs_filblks_t len)
|
|
{
|
|
xfs_fileoff_t distance;
|
|
xfs_fileoff_t end = bno + len;
|
|
|
|
if (irec->br_startoff + irec->br_blockcount <= bno ||
|
|
irec->br_startoff >= end) {
|
|
irec->br_blockcount = 0;
|
|
return;
|
|
}
|
|
|
|
if (irec->br_startoff < bno) {
|
|
distance = bno - irec->br_startoff;
|
|
if (isnullstartblock(irec->br_startblock))
|
|
irec->br_startblock = DELAYSTARTBLOCK;
|
|
if (irec->br_startblock != DELAYSTARTBLOCK &&
|
|
irec->br_startblock != HOLESTARTBLOCK)
|
|
irec->br_startblock += distance;
|
|
irec->br_startoff += distance;
|
|
irec->br_blockcount -= distance;
|
|
}
|
|
|
|
if (end < irec->br_startoff + irec->br_blockcount) {
|
|
distance = irec->br_startoff + irec->br_blockcount - end;
|
|
irec->br_blockcount -= distance;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Trim the returned map to the required bounds
|
|
*/
|
|
STATIC void
|
|
xfs_bmapi_trim_map(
|
|
struct xfs_bmbt_irec *mval,
|
|
struct xfs_bmbt_irec *got,
|
|
xfs_fileoff_t *bno,
|
|
xfs_filblks_t len,
|
|
xfs_fileoff_t obno,
|
|
xfs_fileoff_t end,
|
|
int n,
|
|
uint32_t flags)
|
|
{
|
|
if ((flags & XFS_BMAPI_ENTIRE) ||
|
|
got->br_startoff + got->br_blockcount <= obno) {
|
|
*mval = *got;
|
|
if (isnullstartblock(got->br_startblock))
|
|
mval->br_startblock = DELAYSTARTBLOCK;
|
|
return;
|
|
}
|
|
|
|
if (obno > *bno)
|
|
*bno = obno;
|
|
ASSERT((*bno >= obno) || (n == 0));
|
|
ASSERT(*bno < end);
|
|
mval->br_startoff = *bno;
|
|
if (isnullstartblock(got->br_startblock))
|
|
mval->br_startblock = DELAYSTARTBLOCK;
|
|
else
|
|
mval->br_startblock = got->br_startblock +
|
|
(*bno - got->br_startoff);
|
|
/*
|
|
* Return the minimum of what we got and what we asked for for
|
|
* the length. We can use the len variable here because it is
|
|
* modified below and we could have been there before coming
|
|
* here if the first part of the allocation didn't overlap what
|
|
* was asked for.
|
|
*/
|
|
mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
|
|
got->br_blockcount - (*bno - got->br_startoff));
|
|
mval->br_state = got->br_state;
|
|
ASSERT(mval->br_blockcount <= len);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Update and validate the extent map to return
|
|
*/
|
|
STATIC void
|
|
xfs_bmapi_update_map(
|
|
struct xfs_bmbt_irec **map,
|
|
xfs_fileoff_t *bno,
|
|
xfs_filblks_t *len,
|
|
xfs_fileoff_t obno,
|
|
xfs_fileoff_t end,
|
|
int *n,
|
|
uint32_t flags)
|
|
{
|
|
xfs_bmbt_irec_t *mval = *map;
|
|
|
|
ASSERT((flags & XFS_BMAPI_ENTIRE) ||
|
|
((mval->br_startoff + mval->br_blockcount) <= end));
|
|
ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
|
|
(mval->br_startoff < obno));
|
|
|
|
*bno = mval->br_startoff + mval->br_blockcount;
|
|
*len = end - *bno;
|
|
if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
|
|
/* update previous map with new information */
|
|
ASSERT(mval->br_startblock == mval[-1].br_startblock);
|
|
ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
|
|
ASSERT(mval->br_state == mval[-1].br_state);
|
|
mval[-1].br_blockcount = mval->br_blockcount;
|
|
mval[-1].br_state = mval->br_state;
|
|
} else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
|
|
mval[-1].br_startblock != DELAYSTARTBLOCK &&
|
|
mval[-1].br_startblock != HOLESTARTBLOCK &&
|
|
mval->br_startblock == mval[-1].br_startblock +
|
|
mval[-1].br_blockcount &&
|
|
mval[-1].br_state == mval->br_state) {
|
|
ASSERT(mval->br_startoff ==
|
|
mval[-1].br_startoff + mval[-1].br_blockcount);
|
|
mval[-1].br_blockcount += mval->br_blockcount;
|
|
} else if (*n > 0 &&
|
|
mval->br_startblock == DELAYSTARTBLOCK &&
|
|
mval[-1].br_startblock == DELAYSTARTBLOCK &&
|
|
mval->br_startoff ==
|
|
mval[-1].br_startoff + mval[-1].br_blockcount) {
|
|
mval[-1].br_blockcount += mval->br_blockcount;
|
|
mval[-1].br_state = mval->br_state;
|
|
} else if (!((*n == 0) &&
|
|
((mval->br_startoff + mval->br_blockcount) <=
|
|
obno))) {
|
|
mval++;
|
|
(*n)++;
|
|
}
|
|
*map = mval;
|
|
}
|
|
|
|
/*
|
|
* Map file blocks to filesystem blocks without allocation.
|
|
*/
|
|
int
|
|
xfs_bmapi_read(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t bno,
|
|
xfs_filblks_t len,
|
|
struct xfs_bmbt_irec *mval,
|
|
int *nmap,
|
|
uint32_t flags)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int whichfork = xfs_bmapi_whichfork(flags);
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec got;
|
|
xfs_fileoff_t obno;
|
|
xfs_fileoff_t end;
|
|
struct xfs_iext_cursor icur;
|
|
int error;
|
|
bool eof = false;
|
|
int n = 0;
|
|
|
|
ASSERT(*nmap >= 1);
|
|
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_ENTIRE)));
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
|
|
|
|
if (WARN_ON_ONCE(!ifp))
|
|
return -EFSCORRUPTED;
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT))
|
|
return -EFSCORRUPTED;
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
XFS_STATS_INC(mp, xs_blk_mapr);
|
|
|
|
error = xfs_iread_extents(NULL, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got))
|
|
eof = true;
|
|
end = bno + len;
|
|
obno = bno;
|
|
|
|
while (bno < end && n < *nmap) {
|
|
/* Reading past eof, act as though there's a hole up to end. */
|
|
if (eof)
|
|
got.br_startoff = end;
|
|
if (got.br_startoff > bno) {
|
|
/* Reading in a hole. */
|
|
mval->br_startoff = bno;
|
|
mval->br_startblock = HOLESTARTBLOCK;
|
|
mval->br_blockcount =
|
|
XFS_FILBLKS_MIN(len, got.br_startoff - bno);
|
|
mval->br_state = XFS_EXT_NORM;
|
|
bno += mval->br_blockcount;
|
|
len -= mval->br_blockcount;
|
|
mval++;
|
|
n++;
|
|
continue;
|
|
}
|
|
|
|
/* set up the extent map to return. */
|
|
xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
|
|
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
|
|
|
|
/* If we're done, stop now. */
|
|
if (bno >= end || n >= *nmap)
|
|
break;
|
|
|
|
/* Else go on to the next record. */
|
|
if (!xfs_iext_next_extent(ifp, &icur, &got))
|
|
eof = true;
|
|
}
|
|
*nmap = n;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Add a delayed allocation extent to an inode. Blocks are reserved from the
|
|
* global pool and the extent inserted into the inode in-core extent tree.
|
|
*
|
|
* On entry, got refers to the first extent beyond the offset of the extent to
|
|
* allocate or eof is specified if no such extent exists. On return, got refers
|
|
* to the extent record that was inserted to the inode fork.
|
|
*
|
|
* Note that the allocated extent may have been merged with contiguous extents
|
|
* during insertion into the inode fork. Thus, got does not reflect the current
|
|
* state of the inode fork on return. If necessary, the caller can use lastx to
|
|
* look up the updated record in the inode fork.
|
|
*/
|
|
int
|
|
xfs_bmapi_reserve_delalloc(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
xfs_fileoff_t off,
|
|
xfs_filblks_t len,
|
|
xfs_filblks_t prealloc,
|
|
struct xfs_bmbt_irec *got,
|
|
struct xfs_iext_cursor *icur,
|
|
int eof)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
xfs_extlen_t alen;
|
|
xfs_extlen_t indlen;
|
|
int error;
|
|
xfs_fileoff_t aoff;
|
|
bool use_cowextszhint =
|
|
whichfork == XFS_COW_FORK && !prealloc;
|
|
|
|
retry:
|
|
/*
|
|
* Cap the alloc length. Keep track of prealloc so we know whether to
|
|
* tag the inode before we return.
|
|
*/
|
|
aoff = off;
|
|
alen = XFS_FILBLKS_MIN(len + prealloc, XFS_MAX_BMBT_EXTLEN);
|
|
if (!eof)
|
|
alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
|
|
if (prealloc && alen >= len)
|
|
prealloc = alen - len;
|
|
|
|
/*
|
|
* If we're targetting the COW fork but aren't creating a speculative
|
|
* posteof preallocation, try to expand the reservation to align with
|
|
* the COW extent size hint if there's sufficient free space.
|
|
*
|
|
* Unlike the data fork, the CoW cancellation functions will free all
|
|
* the reservations at inactivation, so we don't require that every
|
|
* delalloc reservation have a dirty pagecache.
|
|
*/
|
|
if (use_cowextszhint) {
|
|
struct xfs_bmbt_irec prev;
|
|
xfs_extlen_t extsz = xfs_get_cowextsz_hint(ip);
|
|
|
|
if (!xfs_iext_peek_prev_extent(ifp, icur, &prev))
|
|
prev.br_startoff = NULLFILEOFF;
|
|
|
|
error = xfs_bmap_extsize_align(mp, got, &prev, extsz, 0, eof,
|
|
1, 0, &aoff, &alen);
|
|
ASSERT(!error);
|
|
}
|
|
|
|
/*
|
|
* Make a transaction-less quota reservation for delayed allocation
|
|
* blocks. This number gets adjusted later. We return if we haven't
|
|
* allocated blocks already inside this loop.
|
|
*/
|
|
error = xfs_quota_reserve_blkres(ip, alen);
|
|
if (error)
|
|
goto out;
|
|
|
|
/*
|
|
* Split changing sb for alen and indlen since they could be coming
|
|
* from different places.
|
|
*/
|
|
indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
|
|
ASSERT(indlen > 0);
|
|
|
|
error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
|
|
if (error)
|
|
goto out_unreserve_quota;
|
|
|
|
error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
|
|
if (error)
|
|
goto out_unreserve_blocks;
|
|
|
|
|
|
ip->i_delayed_blks += alen;
|
|
xfs_mod_delalloc(ip->i_mount, alen + indlen);
|
|
|
|
got->br_startoff = aoff;
|
|
got->br_startblock = nullstartblock(indlen);
|
|
got->br_blockcount = alen;
|
|
got->br_state = XFS_EXT_NORM;
|
|
|
|
xfs_bmap_add_extent_hole_delay(ip, whichfork, icur, got);
|
|
|
|
/*
|
|
* Tag the inode if blocks were preallocated. Note that COW fork
|
|
* preallocation can occur at the start or end of the extent, even when
|
|
* prealloc == 0, so we must also check the aligned offset and length.
|
|
*/
|
|
if (whichfork == XFS_DATA_FORK && prealloc)
|
|
xfs_inode_set_eofblocks_tag(ip);
|
|
if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
|
|
xfs_inode_set_cowblocks_tag(ip);
|
|
|
|
return 0;
|
|
|
|
out_unreserve_blocks:
|
|
xfs_mod_fdblocks(mp, alen, false);
|
|
out_unreserve_quota:
|
|
if (XFS_IS_QUOTA_ON(mp))
|
|
xfs_quota_unreserve_blkres(ip, alen);
|
|
out:
|
|
if (error == -ENOSPC || error == -EDQUOT) {
|
|
trace_xfs_delalloc_enospc(ip, off, len);
|
|
|
|
if (prealloc || use_cowextszhint) {
|
|
/* retry without any preallocation */
|
|
use_cowextszhint = false;
|
|
prealloc = 0;
|
|
goto retry;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_alloc_userdata(
|
|
struct xfs_bmalloca *bma)
|
|
{
|
|
struct xfs_mount *mp = bma->ip->i_mount;
|
|
int whichfork = xfs_bmapi_whichfork(bma->flags);
|
|
int error;
|
|
|
|
/*
|
|
* Set the data type being allocated. For the data fork, the first data
|
|
* in the file is treated differently to all other allocations. For the
|
|
* attribute fork, we only need to ensure the allocated range is not on
|
|
* the busy list.
|
|
*/
|
|
bma->datatype = XFS_ALLOC_NOBUSY;
|
|
if (whichfork == XFS_DATA_FORK || whichfork == XFS_COW_FORK) {
|
|
bma->datatype |= XFS_ALLOC_USERDATA;
|
|
if (bma->offset == 0)
|
|
bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
|
|
|
|
if (mp->m_dalign && bma->length >= mp->m_dalign) {
|
|
error = xfs_bmap_isaeof(bma, whichfork);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (XFS_IS_REALTIME_INODE(bma->ip))
|
|
return xfs_bmap_rtalloc(bma);
|
|
}
|
|
|
|
if (unlikely(XFS_TEST_ERROR(false, mp,
|
|
XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
|
|
return xfs_bmap_exact_minlen_extent_alloc(bma);
|
|
|
|
return xfs_bmap_btalloc(bma);
|
|
}
|
|
|
|
static int
|
|
xfs_bmapi_allocate(
|
|
struct xfs_bmalloca *bma)
|
|
{
|
|
struct xfs_mount *mp = bma->ip->i_mount;
|
|
int whichfork = xfs_bmapi_whichfork(bma->flags);
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
|
|
int tmp_logflags = 0;
|
|
int error;
|
|
|
|
ASSERT(bma->length > 0);
|
|
|
|
/*
|
|
* For the wasdelay case, we could also just allocate the stuff asked
|
|
* for in this bmap call but that wouldn't be as good.
|
|
*/
|
|
if (bma->wasdel) {
|
|
bma->length = (xfs_extlen_t)bma->got.br_blockcount;
|
|
bma->offset = bma->got.br_startoff;
|
|
if (!xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev))
|
|
bma->prev.br_startoff = NULLFILEOFF;
|
|
} else {
|
|
bma->length = XFS_FILBLKS_MIN(bma->length, XFS_MAX_BMBT_EXTLEN);
|
|
if (!bma->eof)
|
|
bma->length = XFS_FILBLKS_MIN(bma->length,
|
|
bma->got.br_startoff - bma->offset);
|
|
}
|
|
|
|
if (bma->flags & XFS_BMAPI_CONTIG)
|
|
bma->minlen = bma->length;
|
|
else
|
|
bma->minlen = 1;
|
|
|
|
if (bma->flags & XFS_BMAPI_METADATA) {
|
|
if (unlikely(XFS_TEST_ERROR(false, mp,
|
|
XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
|
|
error = xfs_bmap_exact_minlen_extent_alloc(bma);
|
|
else
|
|
error = xfs_bmap_btalloc(bma);
|
|
} else {
|
|
error = xfs_bmap_alloc_userdata(bma);
|
|
}
|
|
if (error)
|
|
return error;
|
|
if (bma->blkno == NULLFSBLOCK)
|
|
return -ENOSPC;
|
|
|
|
if (bma->flags & XFS_BMAPI_ZERO) {
|
|
error = xfs_zero_extent(bma->ip, bma->blkno, bma->length);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur)
|
|
bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
|
|
/*
|
|
* Bump the number of extents we've allocated
|
|
* in this call.
|
|
*/
|
|
bma->nallocs++;
|
|
|
|
if (bma->cur)
|
|
bma->cur->bc_ino.flags =
|
|
bma->wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
|
|
|
|
bma->got.br_startoff = bma->offset;
|
|
bma->got.br_startblock = bma->blkno;
|
|
bma->got.br_blockcount = bma->length;
|
|
bma->got.br_state = XFS_EXT_NORM;
|
|
|
|
if (bma->flags & XFS_BMAPI_PREALLOC)
|
|
bma->got.br_state = XFS_EXT_UNWRITTEN;
|
|
|
|
if (bma->wasdel)
|
|
error = xfs_bmap_add_extent_delay_real(bma, whichfork);
|
|
else
|
|
error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip,
|
|
whichfork, &bma->icur, &bma->cur, &bma->got,
|
|
&bma->logflags, bma->flags);
|
|
|
|
bma->logflags |= tmp_logflags;
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Update our extent pointer, given that xfs_bmap_add_extent_delay_real
|
|
* or xfs_bmap_add_extent_hole_real might have merged it into one of
|
|
* the neighbouring ones.
|
|
*/
|
|
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
|
|
|
|
ASSERT(bma->got.br_startoff <= bma->offset);
|
|
ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
|
|
bma->offset + bma->length);
|
|
ASSERT(bma->got.br_state == XFS_EXT_NORM ||
|
|
bma->got.br_state == XFS_EXT_UNWRITTEN);
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_bmapi_convert_unwritten(
|
|
struct xfs_bmalloca *bma,
|
|
struct xfs_bmbt_irec *mval,
|
|
xfs_filblks_t len,
|
|
uint32_t flags)
|
|
{
|
|
int whichfork = xfs_bmapi_whichfork(flags);
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
|
|
int tmp_logflags = 0;
|
|
int error;
|
|
|
|
/* check if we need to do unwritten->real conversion */
|
|
if (mval->br_state == XFS_EXT_UNWRITTEN &&
|
|
(flags & XFS_BMAPI_PREALLOC))
|
|
return 0;
|
|
|
|
/* check if we need to do real->unwritten conversion */
|
|
if (mval->br_state == XFS_EXT_NORM &&
|
|
(flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
|
|
(XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
|
|
return 0;
|
|
|
|
/*
|
|
* Modify (by adding) the state flag, if writing.
|
|
*/
|
|
ASSERT(mval->br_blockcount <= len);
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur) {
|
|
bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
|
|
bma->ip, whichfork);
|
|
}
|
|
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
|
|
? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
|
|
|
|
/*
|
|
* Before insertion into the bmbt, zero the range being converted
|
|
* if required.
|
|
*/
|
|
if (flags & XFS_BMAPI_ZERO) {
|
|
error = xfs_zero_extent(bma->ip, mval->br_startblock,
|
|
mval->br_blockcount);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
|
|
&bma->icur, &bma->cur, mval, &tmp_logflags);
|
|
/*
|
|
* Log the inode core unconditionally in the unwritten extent conversion
|
|
* path because the conversion might not have done so (e.g., if the
|
|
* extent count hasn't changed). We need to make sure the inode is dirty
|
|
* in the transaction for the sake of fsync(), even if nothing has
|
|
* changed, because fsync() will not force the log for this transaction
|
|
* unless it sees the inode pinned.
|
|
*
|
|
* Note: If we're only converting cow fork extents, there aren't
|
|
* any on-disk updates to make, so we don't need to log anything.
|
|
*/
|
|
if (whichfork != XFS_COW_FORK)
|
|
bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Update our extent pointer, given that
|
|
* xfs_bmap_add_extent_unwritten_real might have merged it into one
|
|
* of the neighbouring ones.
|
|
*/
|
|
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
|
|
|
|
/*
|
|
* We may have combined previously unwritten space with written space,
|
|
* so generate another request.
|
|
*/
|
|
if (mval->br_blockcount < len)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
xfs_extlen_t
|
|
xfs_bmapi_minleft(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int fork)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, fork);
|
|
|
|
if (tp && tp->t_highest_agno != NULLAGNUMBER)
|
|
return 0;
|
|
if (ifp->if_format != XFS_DINODE_FMT_BTREE)
|
|
return 1;
|
|
return be16_to_cpu(ifp->if_broot->bb_level) + 1;
|
|
}
|
|
|
|
/*
|
|
* Log whatever the flags say, even if error. Otherwise we might miss detecting
|
|
* a case where the data is changed, there's an error, and it's not logged so we
|
|
* don't shutdown when we should. Don't bother logging extents/btree changes if
|
|
* we converted to the other format.
|
|
*/
|
|
static void
|
|
xfs_bmapi_finish(
|
|
struct xfs_bmalloca *bma,
|
|
int whichfork,
|
|
int error)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(bma->ip, whichfork);
|
|
|
|
if ((bma->logflags & xfs_ilog_fext(whichfork)) &&
|
|
ifp->if_format != XFS_DINODE_FMT_EXTENTS)
|
|
bma->logflags &= ~xfs_ilog_fext(whichfork);
|
|
else if ((bma->logflags & xfs_ilog_fbroot(whichfork)) &&
|
|
ifp->if_format != XFS_DINODE_FMT_BTREE)
|
|
bma->logflags &= ~xfs_ilog_fbroot(whichfork);
|
|
|
|
if (bma->logflags)
|
|
xfs_trans_log_inode(bma->tp, bma->ip, bma->logflags);
|
|
if (bma->cur)
|
|
xfs_btree_del_cursor(bma->cur, error);
|
|
}
|
|
|
|
/*
|
|
* Map file blocks to filesystem blocks, and allocate blocks or convert the
|
|
* extent state if necessary. Details behaviour is controlled by the flags
|
|
* parameter. Only allocates blocks from a single allocation group, to avoid
|
|
* locking problems.
|
|
*
|
|
* Returns 0 on success and places the extent mappings in mval. nmaps is used
|
|
* as an input/output parameter where the caller specifies the maximum number
|
|
* of mappings that may be returned and xfs_bmapi_write passes back the number
|
|
* of mappings (including existing mappings) it found.
|
|
*
|
|
* Returns a negative error code on failure, including -ENOSPC when it could not
|
|
* allocate any blocks and -ENOSR when it did allocate blocks to convert a
|
|
* delalloc range, but those blocks were before the passed in range.
|
|
*/
|
|
int
|
|
xfs_bmapi_write(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode */
|
|
xfs_fileoff_t bno, /* starting file offs. mapped */
|
|
xfs_filblks_t len, /* length to map in file */
|
|
uint32_t flags, /* XFS_BMAPI_... */
|
|
xfs_extlen_t total, /* total blocks needed */
|
|
struct xfs_bmbt_irec *mval, /* output: map values */
|
|
int *nmap) /* i/o: mval size/count */
|
|
{
|
|
struct xfs_bmalloca bma = {
|
|
.tp = tp,
|
|
.ip = ip,
|
|
.total = total,
|
|
};
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int whichfork = xfs_bmapi_whichfork(flags);
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
xfs_fileoff_t end; /* end of mapped file region */
|
|
bool eof = false; /* after the end of extents */
|
|
int error; /* error return */
|
|
int n; /* current extent index */
|
|
xfs_fileoff_t obno; /* old block number (offset) */
|
|
|
|
#ifdef DEBUG
|
|
xfs_fileoff_t orig_bno; /* original block number value */
|
|
int orig_flags; /* original flags arg value */
|
|
xfs_filblks_t orig_len; /* original value of len arg */
|
|
struct xfs_bmbt_irec *orig_mval; /* original value of mval */
|
|
int orig_nmap; /* original value of *nmap */
|
|
|
|
orig_bno = bno;
|
|
orig_len = len;
|
|
orig_flags = flags;
|
|
orig_mval = mval;
|
|
orig_nmap = *nmap;
|
|
#endif
|
|
|
|
ASSERT(*nmap >= 1);
|
|
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
|
|
ASSERT(tp != NULL);
|
|
ASSERT(len > 0);
|
|
ASSERT(ifp->if_format != XFS_DINODE_FMT_LOCAL);
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(!(flags & XFS_BMAPI_REMAP));
|
|
|
|
/* zeroing is for currently only for data extents, not metadata */
|
|
ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
|
|
(XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
|
|
/*
|
|
* we can allocate unwritten extents or pre-zero allocated blocks,
|
|
* but it makes no sense to do both at once. This would result in
|
|
* zeroing the unwritten extent twice, but it still being an
|
|
* unwritten extent....
|
|
*/
|
|
ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
|
|
(XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
XFS_STATS_INC(mp, xs_blk_mapw);
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
goto error0;
|
|
|
|
if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.icur, &bma.got))
|
|
eof = true;
|
|
if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
|
|
bma.prev.br_startoff = NULLFILEOFF;
|
|
bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
|
|
|
|
n = 0;
|
|
end = bno + len;
|
|
obno = bno;
|
|
while (bno < end && n < *nmap) {
|
|
bool need_alloc = false, wasdelay = false;
|
|
|
|
/* in hole or beyond EOF? */
|
|
if (eof || bma.got.br_startoff > bno) {
|
|
/*
|
|
* CoW fork conversions should /never/ hit EOF or
|
|
* holes. There should always be something for us
|
|
* to work on.
|
|
*/
|
|
ASSERT(!((flags & XFS_BMAPI_CONVERT) &&
|
|
(flags & XFS_BMAPI_COWFORK)));
|
|
|
|
need_alloc = true;
|
|
} else if (isnullstartblock(bma.got.br_startblock)) {
|
|
wasdelay = true;
|
|
}
|
|
|
|
/*
|
|
* First, deal with the hole before the allocated space
|
|
* that we found, if any.
|
|
*/
|
|
if (need_alloc || wasdelay) {
|
|
bma.eof = eof;
|
|
bma.conv = !!(flags & XFS_BMAPI_CONVERT);
|
|
bma.wasdel = wasdelay;
|
|
bma.offset = bno;
|
|
bma.flags = flags;
|
|
|
|
/*
|
|
* There's a 32/64 bit type mismatch between the
|
|
* allocation length request (which can be 64 bits in
|
|
* length) and the bma length request, which is
|
|
* xfs_extlen_t and therefore 32 bits. Hence we have to
|
|
* check for 32-bit overflows and handle them here.
|
|
*/
|
|
if (len > (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN)
|
|
bma.length = XFS_MAX_BMBT_EXTLEN;
|
|
else
|
|
bma.length = len;
|
|
|
|
ASSERT(len > 0);
|
|
ASSERT(bma.length > 0);
|
|
error = xfs_bmapi_allocate(&bma);
|
|
if (error) {
|
|
/*
|
|
* If we already allocated space in a previous
|
|
* iteration return what we go so far when
|
|
* running out of space.
|
|
*/
|
|
if (error == -ENOSPC && bma.nallocs)
|
|
break;
|
|
goto error0;
|
|
}
|
|
|
|
/*
|
|
* If this is a CoW allocation, record the data in
|
|
* the refcount btree for orphan recovery.
|
|
*/
|
|
if (whichfork == XFS_COW_FORK)
|
|
xfs_refcount_alloc_cow_extent(tp, bma.blkno,
|
|
bma.length);
|
|
}
|
|
|
|
/* Deal with the allocated space we found. */
|
|
xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
|
|
end, n, flags);
|
|
|
|
/* Execute unwritten extent conversion if necessary */
|
|
error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
|
|
if (error == -EAGAIN)
|
|
continue;
|
|
if (error)
|
|
goto error0;
|
|
|
|
/* update the extent map to return */
|
|
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
|
|
|
|
/*
|
|
* If we're done, stop now. Stop when we've allocated
|
|
* XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
|
|
* the transaction may get too big.
|
|
*/
|
|
if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
|
|
break;
|
|
|
|
/* Else go on to the next record. */
|
|
bma.prev = bma.got;
|
|
if (!xfs_iext_next_extent(ifp, &bma.icur, &bma.got))
|
|
eof = true;
|
|
}
|
|
|
|
error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
|
|
whichfork);
|
|
if (error)
|
|
goto error0;
|
|
|
|
ASSERT(ifp->if_format != XFS_DINODE_FMT_BTREE ||
|
|
ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork));
|
|
xfs_bmapi_finish(&bma, whichfork, 0);
|
|
xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
|
|
orig_nmap, n);
|
|
|
|
/*
|
|
* When converting delayed allocations, xfs_bmapi_allocate ignores
|
|
* the passed in bno and always converts from the start of the found
|
|
* delalloc extent.
|
|
*
|
|
* To avoid a successful return with *nmap set to 0, return the magic
|
|
* -ENOSR error code for this particular case so that the caller can
|
|
* handle it.
|
|
*/
|
|
if (!n) {
|
|
ASSERT(bma.nallocs >= *nmap);
|
|
return -ENOSR;
|
|
}
|
|
*nmap = n;
|
|
return 0;
|
|
error0:
|
|
xfs_bmapi_finish(&bma, whichfork, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Convert an existing delalloc extent to real blocks based on file offset. This
|
|
* attempts to allocate the entire delalloc extent and may require multiple
|
|
* invocations to allocate the target offset if a large enough physical extent
|
|
* is not available.
|
|
*/
|
|
static int
|
|
xfs_bmapi_convert_one_delalloc(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
xfs_off_t offset,
|
|
struct iomap *iomap,
|
|
unsigned int *seq)
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
struct xfs_bmalloca bma = { NULL };
|
|
uint16_t flags = 0;
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
|
|
if (whichfork == XFS_COW_FORK)
|
|
flags |= IOMAP_F_SHARED;
|
|
|
|
/*
|
|
* Space for the extent and indirect blocks was reserved when the
|
|
* delalloc extent was created so there's no need to do so here.
|
|
*/
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0,
|
|
XFS_TRANS_RESERVE, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
error = xfs_iext_count_may_overflow(ip, whichfork,
|
|
XFS_IEXT_ADD_NOSPLIT_CNT);
|
|
if (error == -EFBIG)
|
|
error = xfs_iext_count_upgrade(tp, ip,
|
|
XFS_IEXT_ADD_NOSPLIT_CNT);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &bma.icur, &bma.got) ||
|
|
bma.got.br_startoff > offset_fsb) {
|
|
/*
|
|
* No extent found in the range we are trying to convert. This
|
|
* should only happen for the COW fork, where another thread
|
|
* might have moved the extent to the data fork in the meantime.
|
|
*/
|
|
WARN_ON_ONCE(whichfork != XFS_COW_FORK);
|
|
error = -EAGAIN;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
/*
|
|
* If we find a real extent here we raced with another thread converting
|
|
* the extent. Just return the real extent at this offset.
|
|
*/
|
|
if (!isnullstartblock(bma.got.br_startblock)) {
|
|
xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags,
|
|
xfs_iomap_inode_sequence(ip, flags));
|
|
if (seq)
|
|
*seq = READ_ONCE(ifp->if_seq);
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
bma.tp = tp;
|
|
bma.ip = ip;
|
|
bma.wasdel = true;
|
|
bma.offset = bma.got.br_startoff;
|
|
bma.length = max_t(xfs_filblks_t, bma.got.br_blockcount,
|
|
XFS_MAX_BMBT_EXTLEN);
|
|
bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
|
|
|
|
/*
|
|
* When we're converting the delalloc reservations backing dirty pages
|
|
* in the page cache, we must be careful about how we create the new
|
|
* extents:
|
|
*
|
|
* New CoW fork extents are created unwritten, turned into real extents
|
|
* when we're about to write the data to disk, and mapped into the data
|
|
* fork after the write finishes. End of story.
|
|
*
|
|
* New data fork extents must be mapped in as unwritten and converted
|
|
* to real extents after the write succeeds to avoid exposing stale
|
|
* disk contents if we crash.
|
|
*/
|
|
bma.flags = XFS_BMAPI_PREALLOC;
|
|
if (whichfork == XFS_COW_FORK)
|
|
bma.flags |= XFS_BMAPI_COWFORK;
|
|
|
|
if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
|
|
bma.prev.br_startoff = NULLFILEOFF;
|
|
|
|
error = xfs_bmapi_allocate(&bma);
|
|
if (error)
|
|
goto out_finish;
|
|
|
|
error = -EFSCORRUPTED;
|
|
if (WARN_ON_ONCE(!xfs_valid_startblock(ip, bma.got.br_startblock)))
|
|
goto out_finish;
|
|
|
|
XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, bma.length));
|
|
XFS_STATS_INC(mp, xs_xstrat_quick);
|
|
|
|
ASSERT(!isnullstartblock(bma.got.br_startblock));
|
|
xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags,
|
|
xfs_iomap_inode_sequence(ip, flags));
|
|
if (seq)
|
|
*seq = READ_ONCE(ifp->if_seq);
|
|
|
|
if (whichfork == XFS_COW_FORK)
|
|
xfs_refcount_alloc_cow_extent(tp, bma.blkno, bma.length);
|
|
|
|
error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
|
|
whichfork);
|
|
if (error)
|
|
goto out_finish;
|
|
|
|
xfs_bmapi_finish(&bma, whichfork, 0);
|
|
error = xfs_trans_commit(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
|
|
out_finish:
|
|
xfs_bmapi_finish(&bma, whichfork, error);
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Pass in a dellalloc extent and convert it to real extents, return the real
|
|
* extent that maps offset_fsb in iomap.
|
|
*/
|
|
int
|
|
xfs_bmapi_convert_delalloc(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
loff_t offset,
|
|
struct iomap *iomap,
|
|
unsigned int *seq)
|
|
{
|
|
int error;
|
|
|
|
/*
|
|
* Attempt to allocate whatever delalloc extent currently backs offset
|
|
* and put the result into iomap. Allocate in a loop because it may
|
|
* take several attempts to allocate real blocks for a contiguous
|
|
* delalloc extent if free space is sufficiently fragmented.
|
|
*/
|
|
do {
|
|
error = xfs_bmapi_convert_one_delalloc(ip, whichfork, offset,
|
|
iomap, seq);
|
|
if (error)
|
|
return error;
|
|
} while (iomap->offset + iomap->length <= offset);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_bmapi_remap(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t bno,
|
|
xfs_filblks_t len,
|
|
xfs_fsblock_t startblock,
|
|
uint32_t flags)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp;
|
|
struct xfs_btree_cur *cur = NULL;
|
|
struct xfs_bmbt_irec got;
|
|
struct xfs_iext_cursor icur;
|
|
int whichfork = xfs_bmapi_whichfork(flags);
|
|
int logflags = 0, error;
|
|
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
ASSERT(len > 0);
|
|
ASSERT(len <= (xfs_filblks_t)XFS_MAX_BMBT_EXTLEN);
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC |
|
|
XFS_BMAPI_NORMAP)));
|
|
ASSERT((flags & (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC)) !=
|
|
(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC));
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) {
|
|
/* make sure we only reflink into a hole. */
|
|
ASSERT(got.br_startoff > bno);
|
|
ASSERT(got.br_startoff - bno >= len);
|
|
}
|
|
|
|
ip->i_nblocks += len;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = 0;
|
|
}
|
|
|
|
got.br_startoff = bno;
|
|
got.br_startblock = startblock;
|
|
got.br_blockcount = len;
|
|
if (flags & XFS_BMAPI_PREALLOC)
|
|
got.br_state = XFS_EXT_UNWRITTEN;
|
|
else
|
|
got.br_state = XFS_EXT_NORM;
|
|
|
|
error = xfs_bmap_add_extent_hole_real(tp, ip, whichfork, &icur,
|
|
&cur, &got, &logflags, flags);
|
|
if (error)
|
|
goto error0;
|
|
|
|
error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags, whichfork);
|
|
|
|
error0:
|
|
if (ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS)
|
|
logflags &= ~XFS_ILOG_DEXT;
|
|
else if (ip->i_df.if_format != XFS_DINODE_FMT_BTREE)
|
|
logflags &= ~XFS_ILOG_DBROOT;
|
|
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
if (cur)
|
|
xfs_btree_del_cursor(cur, error);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* When a delalloc extent is split (e.g., due to a hole punch), the original
|
|
* indlen reservation must be shared across the two new extents that are left
|
|
* behind.
|
|
*
|
|
* Given the original reservation and the worst case indlen for the two new
|
|
* extents (as calculated by xfs_bmap_worst_indlen()), split the original
|
|
* reservation fairly across the two new extents. If necessary, steal available
|
|
* blocks from a deleted extent to make up a reservation deficiency (e.g., if
|
|
* ores == 1). The number of stolen blocks is returned. The availability and
|
|
* subsequent accounting of stolen blocks is the responsibility of the caller.
|
|
*/
|
|
static xfs_filblks_t
|
|
xfs_bmap_split_indlen(
|
|
xfs_filblks_t ores, /* original res. */
|
|
xfs_filblks_t *indlen1, /* ext1 worst indlen */
|
|
xfs_filblks_t *indlen2, /* ext2 worst indlen */
|
|
xfs_filblks_t avail) /* stealable blocks */
|
|
{
|
|
xfs_filblks_t len1 = *indlen1;
|
|
xfs_filblks_t len2 = *indlen2;
|
|
xfs_filblks_t nres = len1 + len2; /* new total res. */
|
|
xfs_filblks_t stolen = 0;
|
|
xfs_filblks_t resfactor;
|
|
|
|
/*
|
|
* Steal as many blocks as we can to try and satisfy the worst case
|
|
* indlen for both new extents.
|
|
*/
|
|
if (ores < nres && avail)
|
|
stolen = XFS_FILBLKS_MIN(nres - ores, avail);
|
|
ores += stolen;
|
|
|
|
/* nothing else to do if we've satisfied the new reservation */
|
|
if (ores >= nres)
|
|
return stolen;
|
|
|
|
/*
|
|
* We can't meet the total required reservation for the two extents.
|
|
* Calculate the percent of the overall shortage between both extents
|
|
* and apply this percentage to each of the requested indlen values.
|
|
* This distributes the shortage fairly and reduces the chances that one
|
|
* of the two extents is left with nothing when extents are repeatedly
|
|
* split.
|
|
*/
|
|
resfactor = (ores * 100);
|
|
do_div(resfactor, nres);
|
|
len1 *= resfactor;
|
|
do_div(len1, 100);
|
|
len2 *= resfactor;
|
|
do_div(len2, 100);
|
|
ASSERT(len1 + len2 <= ores);
|
|
ASSERT(len1 < *indlen1 && len2 < *indlen2);
|
|
|
|
/*
|
|
* Hand out the remainder to each extent. If one of the two reservations
|
|
* is zero, we want to make sure that one gets a block first. The loop
|
|
* below starts with len1, so hand len2 a block right off the bat if it
|
|
* is zero.
|
|
*/
|
|
ores -= (len1 + len2);
|
|
ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
|
|
if (ores && !len2 && *indlen2) {
|
|
len2++;
|
|
ores--;
|
|
}
|
|
while (ores) {
|
|
if (len1 < *indlen1) {
|
|
len1++;
|
|
ores--;
|
|
}
|
|
if (!ores)
|
|
break;
|
|
if (len2 < *indlen2) {
|
|
len2++;
|
|
ores--;
|
|
}
|
|
}
|
|
|
|
*indlen1 = len1;
|
|
*indlen2 = len2;
|
|
|
|
return stolen;
|
|
}
|
|
|
|
int
|
|
xfs_bmap_del_extent_delay(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_bmbt_irec *got,
|
|
struct xfs_bmbt_irec *del)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec new;
|
|
int64_t da_old, da_new, da_diff = 0;
|
|
xfs_fileoff_t del_endoff, got_endoff;
|
|
xfs_filblks_t got_indlen, new_indlen, stolen;
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
int error = 0;
|
|
bool isrt;
|
|
|
|
XFS_STATS_INC(mp, xs_del_exlist);
|
|
|
|
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
|
|
del_endoff = del->br_startoff + del->br_blockcount;
|
|
got_endoff = got->br_startoff + got->br_blockcount;
|
|
da_old = startblockval(got->br_startblock);
|
|
da_new = 0;
|
|
|
|
ASSERT(del->br_blockcount > 0);
|
|
ASSERT(got->br_startoff <= del->br_startoff);
|
|
ASSERT(got_endoff >= del_endoff);
|
|
|
|
if (isrt) {
|
|
uint64_t rtexts = del->br_blockcount;
|
|
|
|
do_div(rtexts, mp->m_sb.sb_rextsize);
|
|
xfs_mod_frextents(mp, rtexts);
|
|
}
|
|
|
|
/*
|
|
* Update the inode delalloc counter now and wait to update the
|
|
* sb counters as we might have to borrow some blocks for the
|
|
* indirect block accounting.
|
|
*/
|
|
ASSERT(!isrt);
|
|
error = xfs_quota_unreserve_blkres(ip, del->br_blockcount);
|
|
if (error)
|
|
return error;
|
|
ip->i_delayed_blks -= del->br_blockcount;
|
|
|
|
if (got->br_startoff == del->br_startoff)
|
|
state |= BMAP_LEFT_FILLING;
|
|
if (got_endoff == del_endoff)
|
|
state |= BMAP_RIGHT_FILLING;
|
|
|
|
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Matches the whole extent. Delete the entry.
|
|
*/
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
break;
|
|
case BMAP_LEFT_FILLING:
|
|
/*
|
|
* Deleting the first part of the extent.
|
|
*/
|
|
got->br_startoff = del_endoff;
|
|
got->br_blockcount -= del->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
|
|
got->br_blockcount), da_old);
|
|
got->br_startblock = nullstartblock((int)da_new);
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
break;
|
|
case BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Deleting the last part of the extent.
|
|
*/
|
|
got->br_blockcount = got->br_blockcount - del->br_blockcount;
|
|
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
|
|
got->br_blockcount), da_old);
|
|
got->br_startblock = nullstartblock((int)da_new);
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
break;
|
|
case 0:
|
|
/*
|
|
* Deleting the middle of the extent.
|
|
*
|
|
* Distribute the original indlen reservation across the two new
|
|
* extents. Steal blocks from the deleted extent if necessary.
|
|
* Stealing blocks simply fudges the fdblocks accounting below.
|
|
* Warn if either of the new indlen reservations is zero as this
|
|
* can lead to delalloc problems.
|
|
*/
|
|
got->br_blockcount = del->br_startoff - got->br_startoff;
|
|
got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
|
|
|
|
new.br_blockcount = got_endoff - del_endoff;
|
|
new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
|
|
|
|
WARN_ON_ONCE(!got_indlen || !new_indlen);
|
|
stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
|
|
del->br_blockcount);
|
|
|
|
got->br_startblock = nullstartblock((int)got_indlen);
|
|
|
|
new.br_startoff = del_endoff;
|
|
new.br_state = got->br_state;
|
|
new.br_startblock = nullstartblock((int)new_indlen);
|
|
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_insert(ip, icur, &new, state);
|
|
|
|
da_new = got_indlen + new_indlen - stolen;
|
|
del->br_blockcount -= stolen;
|
|
break;
|
|
}
|
|
|
|
ASSERT(da_old >= da_new);
|
|
da_diff = da_old - da_new;
|
|
if (!isrt)
|
|
da_diff += del->br_blockcount;
|
|
if (da_diff) {
|
|
xfs_mod_fdblocks(mp, da_diff, false);
|
|
xfs_mod_delalloc(mp, -da_diff);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
void
|
|
xfs_bmap_del_extent_cow(
|
|
struct xfs_inode *ip,
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_bmbt_irec *got,
|
|
struct xfs_bmbt_irec *del)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_COW_FORK);
|
|
struct xfs_bmbt_irec new;
|
|
xfs_fileoff_t del_endoff, got_endoff;
|
|
uint32_t state = BMAP_COWFORK;
|
|
|
|
XFS_STATS_INC(mp, xs_del_exlist);
|
|
|
|
del_endoff = del->br_startoff + del->br_blockcount;
|
|
got_endoff = got->br_startoff + got->br_blockcount;
|
|
|
|
ASSERT(del->br_blockcount > 0);
|
|
ASSERT(got->br_startoff <= del->br_startoff);
|
|
ASSERT(got_endoff >= del_endoff);
|
|
ASSERT(!isnullstartblock(got->br_startblock));
|
|
|
|
if (got->br_startoff == del->br_startoff)
|
|
state |= BMAP_LEFT_FILLING;
|
|
if (got_endoff == del_endoff)
|
|
state |= BMAP_RIGHT_FILLING;
|
|
|
|
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Matches the whole extent. Delete the entry.
|
|
*/
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
break;
|
|
case BMAP_LEFT_FILLING:
|
|
/*
|
|
* Deleting the first part of the extent.
|
|
*/
|
|
got->br_startoff = del_endoff;
|
|
got->br_blockcount -= del->br_blockcount;
|
|
got->br_startblock = del->br_startblock + del->br_blockcount;
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
break;
|
|
case BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Deleting the last part of the extent.
|
|
*/
|
|
got->br_blockcount -= del->br_blockcount;
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
break;
|
|
case 0:
|
|
/*
|
|
* Deleting the middle of the extent.
|
|
*/
|
|
got->br_blockcount = del->br_startoff - got->br_startoff;
|
|
|
|
new.br_startoff = del_endoff;
|
|
new.br_blockcount = got_endoff - del_endoff;
|
|
new.br_state = got->br_state;
|
|
new.br_startblock = del->br_startblock + del->br_blockcount;
|
|
|
|
xfs_iext_update_extent(ip, state, icur, got);
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_insert(ip, icur, &new, state);
|
|
break;
|
|
}
|
|
ip->i_delayed_blks -= del->br_blockcount;
|
|
}
|
|
|
|
/*
|
|
* Called by xfs_bmapi to update file extent records and the btree
|
|
* after removing space.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_bmap_del_extent_real(
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
xfs_trans_t *tp, /* current transaction pointer */
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_btree_cur *cur, /* if null, not a btree */
|
|
xfs_bmbt_irec_t *del, /* data to remove from extents */
|
|
int *logflagsp, /* inode logging flags */
|
|
int whichfork, /* data or attr fork */
|
|
uint32_t bflags) /* bmapi flags */
|
|
{
|
|
xfs_fsblock_t del_endblock=0; /* first block past del */
|
|
xfs_fileoff_t del_endoff; /* first offset past del */
|
|
int do_fx; /* free extent at end of routine */
|
|
int error; /* error return value */
|
|
struct xfs_bmbt_irec got; /* current extent entry */
|
|
xfs_fileoff_t got_endoff; /* first offset past got */
|
|
int i; /* temp state */
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
xfs_mount_t *mp; /* mount structure */
|
|
xfs_filblks_t nblks; /* quota/sb block count */
|
|
xfs_bmbt_irec_t new; /* new record to be inserted */
|
|
/* REFERENCED */
|
|
uint qfield; /* quota field to update */
|
|
uint32_t state = xfs_bmap_fork_to_state(whichfork);
|
|
struct xfs_bmbt_irec old;
|
|
|
|
*logflagsp = 0;
|
|
|
|
mp = ip->i_mount;
|
|
XFS_STATS_INC(mp, xs_del_exlist);
|
|
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
ASSERT(del->br_blockcount > 0);
|
|
xfs_iext_get_extent(ifp, icur, &got);
|
|
ASSERT(got.br_startoff <= del->br_startoff);
|
|
del_endoff = del->br_startoff + del->br_blockcount;
|
|
got_endoff = got.br_startoff + got.br_blockcount;
|
|
ASSERT(got_endoff >= del_endoff);
|
|
ASSERT(!isnullstartblock(got.br_startblock));
|
|
qfield = 0;
|
|
|
|
/*
|
|
* If it's the case where the directory code is running with no block
|
|
* reservation, and the deleted block is in the middle of its extent,
|
|
* and the resulting insert of an extent would cause transformation to
|
|
* btree format, then reject it. The calling code will then swap blocks
|
|
* around instead. We have to do this now, rather than waiting for the
|
|
* conversion to btree format, since the transaction will be dirty then.
|
|
*/
|
|
if (tp->t_blk_res == 0 &&
|
|
ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
|
|
ifp->if_nextents >= XFS_IFORK_MAXEXT(ip, whichfork) &&
|
|
del->br_startoff > got.br_startoff && del_endoff < got_endoff)
|
|
return -ENOSPC;
|
|
|
|
*logflagsp = XFS_ILOG_CORE;
|
|
if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
|
|
if (!(bflags & XFS_BMAPI_REMAP)) {
|
|
error = xfs_rtfree_blocks(tp, del->br_startblock,
|
|
del->br_blockcount);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
do_fx = 0;
|
|
qfield = XFS_TRANS_DQ_RTBCOUNT;
|
|
} else {
|
|
do_fx = 1;
|
|
qfield = XFS_TRANS_DQ_BCOUNT;
|
|
}
|
|
nblks = del->br_blockcount;
|
|
|
|
del_endblock = del->br_startblock + del->br_blockcount;
|
|
if (cur) {
|
|
error = xfs_bmbt_lookup_eq(cur, &got, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (got.br_startoff == del->br_startoff)
|
|
state |= BMAP_LEFT_FILLING;
|
|
if (got_endoff == del_endoff)
|
|
state |= BMAP_RIGHT_FILLING;
|
|
|
|
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
|
|
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Matches the whole extent. Delete the entry.
|
|
*/
|
|
xfs_iext_remove(ip, icur, state);
|
|
xfs_iext_prev(ifp, icur);
|
|
ifp->if_nextents--;
|
|
|
|
*logflagsp |= XFS_ILOG_CORE;
|
|
if (!cur) {
|
|
*logflagsp |= xfs_ilog_fext(whichfork);
|
|
break;
|
|
}
|
|
if ((error = xfs_btree_delete(cur, &i)))
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
break;
|
|
case BMAP_LEFT_FILLING:
|
|
/*
|
|
* Deleting the first part of the extent.
|
|
*/
|
|
got.br_startoff = del_endoff;
|
|
got.br_startblock = del_endblock;
|
|
got.br_blockcount -= del->br_blockcount;
|
|
xfs_iext_update_extent(ip, state, icur, &got);
|
|
if (!cur) {
|
|
*logflagsp |= xfs_ilog_fext(whichfork);
|
|
break;
|
|
}
|
|
error = xfs_bmbt_update(cur, &got);
|
|
if (error)
|
|
return error;
|
|
break;
|
|
case BMAP_RIGHT_FILLING:
|
|
/*
|
|
* Deleting the last part of the extent.
|
|
*/
|
|
got.br_blockcount -= del->br_blockcount;
|
|
xfs_iext_update_extent(ip, state, icur, &got);
|
|
if (!cur) {
|
|
*logflagsp |= xfs_ilog_fext(whichfork);
|
|
break;
|
|
}
|
|
error = xfs_bmbt_update(cur, &got);
|
|
if (error)
|
|
return error;
|
|
break;
|
|
case 0:
|
|
/*
|
|
* Deleting the middle of the extent.
|
|
*/
|
|
|
|
old = got;
|
|
|
|
got.br_blockcount = del->br_startoff - got.br_startoff;
|
|
xfs_iext_update_extent(ip, state, icur, &got);
|
|
|
|
new.br_startoff = del_endoff;
|
|
new.br_blockcount = got_endoff - del_endoff;
|
|
new.br_state = got.br_state;
|
|
new.br_startblock = del_endblock;
|
|
|
|
*logflagsp |= XFS_ILOG_CORE;
|
|
if (cur) {
|
|
error = xfs_bmbt_update(cur, &got);
|
|
if (error)
|
|
return error;
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
return error;
|
|
cur->bc_rec.b = new;
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error && error != -ENOSPC)
|
|
return error;
|
|
/*
|
|
* If get no-space back from btree insert, it tried a
|
|
* split, and we have a zero block reservation. Fix up
|
|
* our state and return the error.
|
|
*/
|
|
if (error == -ENOSPC) {
|
|
/*
|
|
* Reset the cursor, don't trust it after any
|
|
* insert operation.
|
|
*/
|
|
error = xfs_bmbt_lookup_eq(cur, &got, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
/*
|
|
* Update the btree record back
|
|
* to the original value.
|
|
*/
|
|
error = xfs_bmbt_update(cur, &old);
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* Reset the extent record back
|
|
* to the original value.
|
|
*/
|
|
xfs_iext_update_extent(ip, state, icur, &old);
|
|
*logflagsp = 0;
|
|
return -ENOSPC;
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
} else
|
|
*logflagsp |= xfs_ilog_fext(whichfork);
|
|
|
|
ifp->if_nextents++;
|
|
xfs_iext_next(ifp, icur);
|
|
xfs_iext_insert(ip, icur, &new, state);
|
|
break;
|
|
}
|
|
|
|
/* remove reverse mapping */
|
|
xfs_rmap_unmap_extent(tp, ip, whichfork, del);
|
|
|
|
/*
|
|
* If we need to, add to list of extents to delete.
|
|
*/
|
|
if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
|
|
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
|
|
xfs_refcount_decrease_extent(tp, del);
|
|
} else {
|
|
error = __xfs_free_extent_later(tp, del->br_startblock,
|
|
del->br_blockcount, NULL,
|
|
XFS_AG_RESV_NONE,
|
|
((bflags & XFS_BMAPI_NODISCARD) ||
|
|
del->br_state == XFS_EXT_UNWRITTEN));
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Adjust inode # blocks in the file.
|
|
*/
|
|
if (nblks)
|
|
ip->i_nblocks -= nblks;
|
|
/*
|
|
* Adjust quota data.
|
|
*/
|
|
if (qfield && !(bflags & XFS_BMAPI_REMAP))
|
|
xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unmap (remove) blocks from a file.
|
|
* If nexts is nonzero then the number of extents to remove is limited to
|
|
* that value. If not all extents in the block range can be removed then
|
|
* *done is set.
|
|
*/
|
|
int /* error */
|
|
__xfs_bunmapi(
|
|
struct xfs_trans *tp, /* transaction pointer */
|
|
struct xfs_inode *ip, /* incore inode */
|
|
xfs_fileoff_t start, /* first file offset deleted */
|
|
xfs_filblks_t *rlen, /* i/o: amount remaining */
|
|
uint32_t flags, /* misc flags */
|
|
xfs_extnum_t nexts) /* number of extents max */
|
|
{
|
|
struct xfs_btree_cur *cur; /* bmap btree cursor */
|
|
struct xfs_bmbt_irec del; /* extent being deleted */
|
|
int error; /* error return value */
|
|
xfs_extnum_t extno; /* extent number in list */
|
|
struct xfs_bmbt_irec got; /* current extent record */
|
|
struct xfs_ifork *ifp; /* inode fork pointer */
|
|
int isrt; /* freeing in rt area */
|
|
int logflags; /* transaction logging flags */
|
|
xfs_extlen_t mod; /* rt extent offset */
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int tmp_logflags; /* partial logging flags */
|
|
int wasdel; /* was a delayed alloc extent */
|
|
int whichfork; /* data or attribute fork */
|
|
xfs_fsblock_t sum;
|
|
xfs_filblks_t len = *rlen; /* length to unmap in file */
|
|
xfs_fileoff_t end;
|
|
struct xfs_iext_cursor icur;
|
|
bool done = false;
|
|
|
|
trace_xfs_bunmap(ip, start, len, flags, _RET_IP_);
|
|
|
|
whichfork = xfs_bmapi_whichfork(flags);
|
|
ASSERT(whichfork != XFS_COW_FORK);
|
|
ifp = xfs_ifork_ptr(ip, whichfork);
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)))
|
|
return -EFSCORRUPTED;
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(len > 0);
|
|
ASSERT(nexts >= 0);
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (xfs_iext_count(ifp) == 0) {
|
|
*rlen = 0;
|
|
return 0;
|
|
}
|
|
XFS_STATS_INC(mp, xs_blk_unmap);
|
|
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
|
|
end = start + len;
|
|
|
|
if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) {
|
|
*rlen = 0;
|
|
return 0;
|
|
}
|
|
end--;
|
|
|
|
logflags = 0;
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = 0;
|
|
} else
|
|
cur = NULL;
|
|
|
|
if (isrt) {
|
|
/*
|
|
* Synchronize by locking the bitmap inode.
|
|
*/
|
|
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
|
|
xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
|
|
xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
|
|
xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
extno = 0;
|
|
while (end != (xfs_fileoff_t)-1 && end >= start &&
|
|
(nexts == 0 || extno < nexts)) {
|
|
/*
|
|
* Is the found extent after a hole in which end lives?
|
|
* Just back up to the previous extent, if so.
|
|
*/
|
|
if (got.br_startoff > end &&
|
|
!xfs_iext_prev_extent(ifp, &icur, &got)) {
|
|
done = true;
|
|
break;
|
|
}
|
|
/*
|
|
* Is the last block of this extent before the range
|
|
* we're supposed to delete? If so, we're done.
|
|
*/
|
|
end = XFS_FILEOFF_MIN(end,
|
|
got.br_startoff + got.br_blockcount - 1);
|
|
if (end < start)
|
|
break;
|
|
/*
|
|
* Then deal with the (possibly delayed) allocated space
|
|
* we found.
|
|
*/
|
|
del = got;
|
|
wasdel = isnullstartblock(del.br_startblock);
|
|
|
|
if (got.br_startoff < start) {
|
|
del.br_startoff = start;
|
|
del.br_blockcount -= start - got.br_startoff;
|
|
if (!wasdel)
|
|
del.br_startblock += start - got.br_startoff;
|
|
}
|
|
if (del.br_startoff + del.br_blockcount > end + 1)
|
|
del.br_blockcount = end + 1 - del.br_startoff;
|
|
|
|
if (!isrt)
|
|
goto delete;
|
|
|
|
sum = del.br_startblock + del.br_blockcount;
|
|
div_u64_rem(sum, mp->m_sb.sb_rextsize, &mod);
|
|
if (mod) {
|
|
/*
|
|
* Realtime extent not lined up at the end.
|
|
* The extent could have been split into written
|
|
* and unwritten pieces, or we could just be
|
|
* unmapping part of it. But we can't really
|
|
* get rid of part of a realtime extent.
|
|
*/
|
|
if (del.br_state == XFS_EXT_UNWRITTEN) {
|
|
/*
|
|
* This piece is unwritten, or we're not
|
|
* using unwritten extents. Skip over it.
|
|
*/
|
|
ASSERT(end >= mod);
|
|
end -= mod > del.br_blockcount ?
|
|
del.br_blockcount : mod;
|
|
if (end < got.br_startoff &&
|
|
!xfs_iext_prev_extent(ifp, &icur, &got)) {
|
|
done = true;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
/*
|
|
* It's written, turn it unwritten.
|
|
* This is better than zeroing it.
|
|
*/
|
|
ASSERT(del.br_state == XFS_EXT_NORM);
|
|
ASSERT(tp->t_blk_res > 0);
|
|
/*
|
|
* If this spans a realtime extent boundary,
|
|
* chop it back to the start of the one we end at.
|
|
*/
|
|
if (del.br_blockcount > mod) {
|
|
del.br_startoff += del.br_blockcount - mod;
|
|
del.br_startblock += del.br_blockcount - mod;
|
|
del.br_blockcount = mod;
|
|
}
|
|
del.br_state = XFS_EXT_UNWRITTEN;
|
|
error = xfs_bmap_add_extent_unwritten_real(tp, ip,
|
|
whichfork, &icur, &cur, &del,
|
|
&logflags);
|
|
if (error)
|
|
goto error0;
|
|
goto nodelete;
|
|
}
|
|
div_u64_rem(del.br_startblock, mp->m_sb.sb_rextsize, &mod);
|
|
if (mod) {
|
|
xfs_extlen_t off = mp->m_sb.sb_rextsize - mod;
|
|
|
|
/*
|
|
* Realtime extent is lined up at the end but not
|
|
* at the front. We'll get rid of full extents if
|
|
* we can.
|
|
*/
|
|
if (del.br_blockcount > off) {
|
|
del.br_blockcount -= off;
|
|
del.br_startoff += off;
|
|
del.br_startblock += off;
|
|
} else if (del.br_startoff == start &&
|
|
(del.br_state == XFS_EXT_UNWRITTEN ||
|
|
tp->t_blk_res == 0)) {
|
|
/*
|
|
* Can't make it unwritten. There isn't
|
|
* a full extent here so just skip it.
|
|
*/
|
|
ASSERT(end >= del.br_blockcount);
|
|
end -= del.br_blockcount;
|
|
if (got.br_startoff > end &&
|
|
!xfs_iext_prev_extent(ifp, &icur, &got)) {
|
|
done = true;
|
|
break;
|
|
}
|
|
continue;
|
|
} else if (del.br_state == XFS_EXT_UNWRITTEN) {
|
|
struct xfs_bmbt_irec prev;
|
|
xfs_fileoff_t unwrite_start;
|
|
|
|
/*
|
|
* This one is already unwritten.
|
|
* It must have a written left neighbor.
|
|
* Unwrite the killed part of that one and
|
|
* try again.
|
|
*/
|
|
if (!xfs_iext_prev_extent(ifp, &icur, &prev))
|
|
ASSERT(0);
|
|
ASSERT(prev.br_state == XFS_EXT_NORM);
|
|
ASSERT(!isnullstartblock(prev.br_startblock));
|
|
ASSERT(del.br_startblock ==
|
|
prev.br_startblock + prev.br_blockcount);
|
|
unwrite_start = max3(start,
|
|
del.br_startoff - mod,
|
|
prev.br_startoff);
|
|
mod = unwrite_start - prev.br_startoff;
|
|
prev.br_startoff = unwrite_start;
|
|
prev.br_startblock += mod;
|
|
prev.br_blockcount -= mod;
|
|
prev.br_state = XFS_EXT_UNWRITTEN;
|
|
error = xfs_bmap_add_extent_unwritten_real(tp,
|
|
ip, whichfork, &icur, &cur,
|
|
&prev, &logflags);
|
|
if (error)
|
|
goto error0;
|
|
goto nodelete;
|
|
} else {
|
|
ASSERT(del.br_state == XFS_EXT_NORM);
|
|
del.br_state = XFS_EXT_UNWRITTEN;
|
|
error = xfs_bmap_add_extent_unwritten_real(tp,
|
|
ip, whichfork, &icur, &cur,
|
|
&del, &logflags);
|
|
if (error)
|
|
goto error0;
|
|
goto nodelete;
|
|
}
|
|
}
|
|
|
|
delete:
|
|
if (wasdel) {
|
|
error = xfs_bmap_del_extent_delay(ip, whichfork, &icur,
|
|
&got, &del);
|
|
} else {
|
|
error = xfs_bmap_del_extent_real(ip, tp, &icur, cur,
|
|
&del, &tmp_logflags, whichfork,
|
|
flags);
|
|
logflags |= tmp_logflags;
|
|
}
|
|
|
|
if (error)
|
|
goto error0;
|
|
|
|
end = del.br_startoff - 1;
|
|
nodelete:
|
|
/*
|
|
* If not done go on to the next (previous) record.
|
|
*/
|
|
if (end != (xfs_fileoff_t)-1 && end >= start) {
|
|
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
|
|
(got.br_startoff > end &&
|
|
!xfs_iext_prev_extent(ifp, &icur, &got))) {
|
|
done = true;
|
|
break;
|
|
}
|
|
extno++;
|
|
}
|
|
}
|
|
if (done || end == (xfs_fileoff_t)-1 || end < start)
|
|
*rlen = 0;
|
|
else
|
|
*rlen = end - start + 1;
|
|
|
|
/*
|
|
* Convert to a btree if necessary.
|
|
*/
|
|
if (xfs_bmap_needs_btree(ip, whichfork)) {
|
|
ASSERT(cur == NULL);
|
|
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
|
|
&tmp_logflags, whichfork);
|
|
logflags |= tmp_logflags;
|
|
} else {
|
|
error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags,
|
|
whichfork);
|
|
}
|
|
|
|
error0:
|
|
/*
|
|
* Log everything. Do this after conversion, there's no point in
|
|
* logging the extent records if we've converted to btree format.
|
|
*/
|
|
if ((logflags & xfs_ilog_fext(whichfork)) &&
|
|
ifp->if_format != XFS_DINODE_FMT_EXTENTS)
|
|
logflags &= ~xfs_ilog_fext(whichfork);
|
|
else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
|
|
ifp->if_format != XFS_DINODE_FMT_BTREE)
|
|
logflags &= ~xfs_ilog_fbroot(whichfork);
|
|
/*
|
|
* Log inode even in the error case, if the transaction
|
|
* is dirty we'll need to shut down the filesystem.
|
|
*/
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
if (cur) {
|
|
if (!error)
|
|
cur->bc_ino.allocated = 0;
|
|
xfs_btree_del_cursor(cur, error);
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/* Unmap a range of a file. */
|
|
int
|
|
xfs_bunmapi(
|
|
xfs_trans_t *tp,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t bno,
|
|
xfs_filblks_t len,
|
|
uint32_t flags,
|
|
xfs_extnum_t nexts,
|
|
int *done)
|
|
{
|
|
int error;
|
|
|
|
error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts);
|
|
*done = (len == 0);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Determine whether an extent shift can be accomplished by a merge with the
|
|
* extent that precedes the target hole of the shift.
|
|
*/
|
|
STATIC bool
|
|
xfs_bmse_can_merge(
|
|
struct xfs_bmbt_irec *left, /* preceding extent */
|
|
struct xfs_bmbt_irec *got, /* current extent to shift */
|
|
xfs_fileoff_t shift) /* shift fsb */
|
|
{
|
|
xfs_fileoff_t startoff;
|
|
|
|
startoff = got->br_startoff - shift;
|
|
|
|
/*
|
|
* The extent, once shifted, must be adjacent in-file and on-disk with
|
|
* the preceding extent.
|
|
*/
|
|
if ((left->br_startoff + left->br_blockcount != startoff) ||
|
|
(left->br_startblock + left->br_blockcount != got->br_startblock) ||
|
|
(left->br_state != got->br_state) ||
|
|
(left->br_blockcount + got->br_blockcount > XFS_MAX_BMBT_EXTLEN))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* A bmap extent shift adjusts the file offset of an extent to fill a preceding
|
|
* hole in the file. If an extent shift would result in the extent being fully
|
|
* adjacent to the extent that currently precedes the hole, we can merge with
|
|
* the preceding extent rather than do the shift.
|
|
*
|
|
* This function assumes the caller has verified a shift-by-merge is possible
|
|
* with the provided extents via xfs_bmse_can_merge().
|
|
*/
|
|
STATIC int
|
|
xfs_bmse_merge(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
xfs_fileoff_t shift, /* shift fsb */
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_bmbt_irec *got, /* extent to shift */
|
|
struct xfs_bmbt_irec *left, /* preceding extent */
|
|
struct xfs_btree_cur *cur,
|
|
int *logflags) /* output */
|
|
{
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_bmbt_irec new;
|
|
xfs_filblks_t blockcount;
|
|
int error, i;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
blockcount = left->br_blockcount + got->br_blockcount;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(xfs_bmse_can_merge(left, got, shift));
|
|
|
|
new = *left;
|
|
new.br_blockcount = blockcount;
|
|
|
|
/*
|
|
* Update the on-disk extent count, the btree if necessary and log the
|
|
* inode.
|
|
*/
|
|
ifp->if_nextents--;
|
|
*logflags |= XFS_ILOG_CORE;
|
|
if (!cur) {
|
|
*logflags |= XFS_ILOG_DEXT;
|
|
goto done;
|
|
}
|
|
|
|
/* lookup and remove the extent to merge */
|
|
error = xfs_bmbt_lookup_eq(cur, got, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
/* lookup and update size of the previous extent */
|
|
error = xfs_bmbt_lookup_eq(cur, left, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_bmbt_update(cur, &new);
|
|
if (error)
|
|
return error;
|
|
|
|
/* change to extent format if required after extent removal */
|
|
error = xfs_bmap_btree_to_extents(tp, ip, cur, logflags, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
done:
|
|
xfs_iext_remove(ip, icur, 0);
|
|
xfs_iext_prev(ifp, icur);
|
|
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
|
|
&new);
|
|
|
|
/* update reverse mapping. rmap functions merge the rmaps for us */
|
|
xfs_rmap_unmap_extent(tp, ip, whichfork, got);
|
|
memcpy(&new, got, sizeof(new));
|
|
new.br_startoff = left->br_startoff + left->br_blockcount;
|
|
xfs_rmap_map_extent(tp, ip, whichfork, &new);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
xfs_bmap_shift_update_extent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_iext_cursor *icur,
|
|
struct xfs_bmbt_irec *got,
|
|
struct xfs_btree_cur *cur,
|
|
int *logflags,
|
|
xfs_fileoff_t startoff)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_bmbt_irec prev = *got;
|
|
int error, i;
|
|
|
|
*logflags |= XFS_ILOG_CORE;
|
|
|
|
got->br_startoff = startoff;
|
|
|
|
if (cur) {
|
|
error = xfs_bmbt_lookup_eq(cur, &prev, &i);
|
|
if (error)
|
|
return error;
|
|
if (XFS_IS_CORRUPT(mp, i != 1))
|
|
return -EFSCORRUPTED;
|
|
|
|
error = xfs_bmbt_update(cur, got);
|
|
if (error)
|
|
return error;
|
|
} else {
|
|
*logflags |= XFS_ILOG_DEXT;
|
|
}
|
|
|
|
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
|
|
got);
|
|
|
|
/* update reverse mapping */
|
|
xfs_rmap_unmap_extent(tp, ip, whichfork, &prev);
|
|
xfs_rmap_map_extent(tp, ip, whichfork, got);
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_bmap_collapse_extents(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t *next_fsb,
|
|
xfs_fileoff_t offset_shift_fsb,
|
|
bool *done)
|
|
{
|
|
int whichfork = XFS_DATA_FORK;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_btree_cur *cur = NULL;
|
|
struct xfs_bmbt_irec got, prev;
|
|
struct xfs_iext_cursor icur;
|
|
xfs_fileoff_t new_startoff;
|
|
int error = 0;
|
|
int logflags = 0;
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = 0;
|
|
}
|
|
|
|
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
|
|
*done = true;
|
|
goto del_cursor;
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
|
|
new_startoff = got.br_startoff - offset_shift_fsb;
|
|
if (xfs_iext_peek_prev_extent(ifp, &icur, &prev)) {
|
|
if (new_startoff < prev.br_startoff + prev.br_blockcount) {
|
|
error = -EINVAL;
|
|
goto del_cursor;
|
|
}
|
|
|
|
if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) {
|
|
error = xfs_bmse_merge(tp, ip, whichfork,
|
|
offset_shift_fsb, &icur, &got, &prev,
|
|
cur, &logflags);
|
|
if (error)
|
|
goto del_cursor;
|
|
goto done;
|
|
}
|
|
} else {
|
|
if (got.br_startoff < offset_shift_fsb) {
|
|
error = -EINVAL;
|
|
goto del_cursor;
|
|
}
|
|
}
|
|
|
|
error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
|
|
cur, &logflags, new_startoff);
|
|
if (error)
|
|
goto del_cursor;
|
|
|
|
done:
|
|
if (!xfs_iext_next_extent(ifp, &icur, &got)) {
|
|
*done = true;
|
|
goto del_cursor;
|
|
}
|
|
|
|
*next_fsb = got.br_startoff;
|
|
del_cursor:
|
|
if (cur)
|
|
xfs_btree_del_cursor(cur, error);
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
return error;
|
|
}
|
|
|
|
/* Make sure we won't be right-shifting an extent past the maximum bound. */
|
|
int
|
|
xfs_bmap_can_insert_extents(
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t off,
|
|
xfs_fileoff_t shift)
|
|
{
|
|
struct xfs_bmbt_irec got;
|
|
int is_empty;
|
|
int error = 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
|
|
if (xfs_is_shutdown(ip->i_mount))
|
|
return -EIO;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_bmap_last_extent(NULL, ip, XFS_DATA_FORK, &got, &is_empty);
|
|
if (!error && !is_empty && got.br_startoff >= off &&
|
|
((got.br_startoff + shift) & BMBT_STARTOFF_MASK) < got.br_startoff)
|
|
error = -EINVAL;
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_bmap_insert_extents(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t *next_fsb,
|
|
xfs_fileoff_t offset_shift_fsb,
|
|
bool *done,
|
|
xfs_fileoff_t stop_fsb)
|
|
{
|
|
int whichfork = XFS_DATA_FORK;
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_btree_cur *cur = NULL;
|
|
struct xfs_bmbt_irec got, next;
|
|
struct xfs_iext_cursor icur;
|
|
xfs_fileoff_t new_startoff;
|
|
int error = 0;
|
|
int logflags = 0;
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
|
|
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = 0;
|
|
}
|
|
|
|
if (*next_fsb == NULLFSBLOCK) {
|
|
xfs_iext_last(ifp, &icur);
|
|
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
|
|
stop_fsb > got.br_startoff) {
|
|
*done = true;
|
|
goto del_cursor;
|
|
}
|
|
} else {
|
|
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
|
|
*done = true;
|
|
goto del_cursor;
|
|
}
|
|
}
|
|
if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
|
|
if (XFS_IS_CORRUPT(mp, stop_fsb > got.br_startoff)) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
|
|
new_startoff = got.br_startoff + offset_shift_fsb;
|
|
if (xfs_iext_peek_next_extent(ifp, &icur, &next)) {
|
|
if (new_startoff + got.br_blockcount > next.br_startoff) {
|
|
error = -EINVAL;
|
|
goto del_cursor;
|
|
}
|
|
|
|
/*
|
|
* Unlike a left shift (which involves a hole punch), a right
|
|
* shift does not modify extent neighbors in any way. We should
|
|
* never find mergeable extents in this scenario. Check anyways
|
|
* and warn if we encounter two extents that could be one.
|
|
*/
|
|
if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb))
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
|
|
error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
|
|
cur, &logflags, new_startoff);
|
|
if (error)
|
|
goto del_cursor;
|
|
|
|
if (!xfs_iext_prev_extent(ifp, &icur, &got) ||
|
|
stop_fsb >= got.br_startoff + got.br_blockcount) {
|
|
*done = true;
|
|
goto del_cursor;
|
|
}
|
|
|
|
*next_fsb = got.br_startoff;
|
|
del_cursor:
|
|
if (cur)
|
|
xfs_btree_del_cursor(cur, error);
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Splits an extent into two extents at split_fsb block such that it is the
|
|
* first block of the current_ext. @ext is a target extent to be split.
|
|
* @split_fsb is a block where the extents is split. If split_fsb lies in a
|
|
* hole or the first block of extents, just return 0.
|
|
*/
|
|
int
|
|
xfs_bmap_split_extent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
xfs_fileoff_t split_fsb)
|
|
{
|
|
int whichfork = XFS_DATA_FORK;
|
|
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork);
|
|
struct xfs_btree_cur *cur = NULL;
|
|
struct xfs_bmbt_irec got;
|
|
struct xfs_bmbt_irec new; /* split extent */
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fsblock_t gotblkcnt; /* new block count for got */
|
|
struct xfs_iext_cursor icur;
|
|
int error = 0;
|
|
int logflags = 0;
|
|
int i = 0;
|
|
|
|
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
|
|
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
/* Read in all the extents */
|
|
error = xfs_iread_extents(tp, ip, whichfork);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If there are not extents, or split_fsb lies in a hole we are done.
|
|
*/
|
|
if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &icur, &got) ||
|
|
got.br_startoff >= split_fsb)
|
|
return 0;
|
|
|
|
gotblkcnt = split_fsb - got.br_startoff;
|
|
new.br_startoff = split_fsb;
|
|
new.br_startblock = got.br_startblock + gotblkcnt;
|
|
new.br_blockcount = got.br_blockcount - gotblkcnt;
|
|
new.br_state = got.br_state;
|
|
|
|
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
|
|
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
|
|
cur->bc_ino.flags = 0;
|
|
error = xfs_bmbt_lookup_eq(cur, &got, &i);
|
|
if (error)
|
|
goto del_cursor;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
}
|
|
|
|
got.br_blockcount = gotblkcnt;
|
|
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), &icur,
|
|
&got);
|
|
|
|
logflags = XFS_ILOG_CORE;
|
|
if (cur) {
|
|
error = xfs_bmbt_update(cur, &got);
|
|
if (error)
|
|
goto del_cursor;
|
|
} else
|
|
logflags |= XFS_ILOG_DEXT;
|
|
|
|
/* Add new extent */
|
|
xfs_iext_next(ifp, &icur);
|
|
xfs_iext_insert(ip, &icur, &new, 0);
|
|
ifp->if_nextents++;
|
|
|
|
if (cur) {
|
|
error = xfs_bmbt_lookup_eq(cur, &new, &i);
|
|
if (error)
|
|
goto del_cursor;
|
|
if (XFS_IS_CORRUPT(mp, i != 0)) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto del_cursor;
|
|
if (XFS_IS_CORRUPT(mp, i != 1)) {
|
|
error = -EFSCORRUPTED;
|
|
goto del_cursor;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Convert to a btree if necessary.
|
|
*/
|
|
if (xfs_bmap_needs_btree(ip, whichfork)) {
|
|
int tmp_logflags; /* partial log flag return val */
|
|
|
|
ASSERT(cur == NULL);
|
|
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
|
|
&tmp_logflags, whichfork);
|
|
logflags |= tmp_logflags;
|
|
}
|
|
|
|
del_cursor:
|
|
if (cur) {
|
|
cur->bc_ino.allocated = 0;
|
|
xfs_btree_del_cursor(cur, error);
|
|
}
|
|
|
|
if (logflags)
|
|
xfs_trans_log_inode(tp, ip, logflags);
|
|
return error;
|
|
}
|
|
|
|
/* Deferred mapping is only for real extents in the data fork. */
|
|
static bool
|
|
xfs_bmap_is_update_needed(
|
|
struct xfs_bmbt_irec *bmap)
|
|
{
|
|
return bmap->br_startblock != HOLESTARTBLOCK &&
|
|
bmap->br_startblock != DELAYSTARTBLOCK;
|
|
}
|
|
|
|
/* Record a bmap intent. */
|
|
static int
|
|
__xfs_bmap_add(
|
|
struct xfs_trans *tp,
|
|
enum xfs_bmap_intent_type type,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *bmap)
|
|
{
|
|
struct xfs_bmap_intent *bi;
|
|
|
|
trace_xfs_bmap_defer(tp->t_mountp,
|
|
XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock),
|
|
type,
|
|
XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock),
|
|
ip->i_ino, whichfork,
|
|
bmap->br_startoff,
|
|
bmap->br_blockcount,
|
|
bmap->br_state);
|
|
|
|
bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_NOFS | __GFP_NOFAIL);
|
|
INIT_LIST_HEAD(&bi->bi_list);
|
|
bi->bi_type = type;
|
|
bi->bi_owner = ip;
|
|
bi->bi_whichfork = whichfork;
|
|
bi->bi_bmap = *bmap;
|
|
|
|
xfs_bmap_update_get_group(tp->t_mountp, bi);
|
|
xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
|
|
return 0;
|
|
}
|
|
|
|
/* Map an extent into a file. */
|
|
void
|
|
xfs_bmap_map_extent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_bmbt_irec *PREV)
|
|
{
|
|
if (!xfs_bmap_is_update_needed(PREV))
|
|
return;
|
|
|
|
__xfs_bmap_add(tp, XFS_BMAP_MAP, ip, XFS_DATA_FORK, PREV);
|
|
}
|
|
|
|
/* Unmap an extent out of a file. */
|
|
void
|
|
xfs_bmap_unmap_extent(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_bmbt_irec *PREV)
|
|
{
|
|
if (!xfs_bmap_is_update_needed(PREV))
|
|
return;
|
|
|
|
__xfs_bmap_add(tp, XFS_BMAP_UNMAP, ip, XFS_DATA_FORK, PREV);
|
|
}
|
|
|
|
/*
|
|
* Process one of the deferred bmap operations. We pass back the
|
|
* btree cursor to maintain our lock on the bmapbt between calls.
|
|
*/
|
|
int
|
|
xfs_bmap_finish_one(
|
|
struct xfs_trans *tp,
|
|
struct xfs_bmap_intent *bi)
|
|
{
|
|
struct xfs_bmbt_irec *bmap = &bi->bi_bmap;
|
|
int error = 0;
|
|
|
|
ASSERT(tp->t_highest_agno == NULLAGNUMBER);
|
|
|
|
trace_xfs_bmap_deferred(tp->t_mountp,
|
|
XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock),
|
|
bi->bi_type,
|
|
XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock),
|
|
bi->bi_owner->i_ino, bi->bi_whichfork,
|
|
bmap->br_startoff, bmap->br_blockcount,
|
|
bmap->br_state);
|
|
|
|
if (WARN_ON_ONCE(bi->bi_whichfork != XFS_DATA_FORK))
|
|
return -EFSCORRUPTED;
|
|
|
|
if (XFS_TEST_ERROR(false, tp->t_mountp,
|
|
XFS_ERRTAG_BMAP_FINISH_ONE))
|
|
return -EIO;
|
|
|
|
switch (bi->bi_type) {
|
|
case XFS_BMAP_MAP:
|
|
error = xfs_bmapi_remap(tp, bi->bi_owner, bmap->br_startoff,
|
|
bmap->br_blockcount, bmap->br_startblock, 0);
|
|
bmap->br_blockcount = 0;
|
|
break;
|
|
case XFS_BMAP_UNMAP:
|
|
error = __xfs_bunmapi(tp, bi->bi_owner, bmap->br_startoff,
|
|
&bmap->br_blockcount, XFS_BMAPI_REMAP, 1);
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
error = -EFSCORRUPTED;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Check that an inode's extent does not have invalid flags or bad ranges. */
|
|
xfs_failaddr_t
|
|
xfs_bmap_validate_extent(
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *irec)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
|
|
return __this_address;
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip) && whichfork == XFS_DATA_FORK) {
|
|
if (!xfs_verify_rtext(mp, irec->br_startblock,
|
|
irec->br_blockcount))
|
|
return __this_address;
|
|
} else {
|
|
if (!xfs_verify_fsbext(mp, irec->br_startblock,
|
|
irec->br_blockcount))
|
|
return __this_address;
|
|
}
|
|
if (irec->br_state != XFS_EXT_NORM && whichfork != XFS_DATA_FORK)
|
|
return __this_address;
|
|
return NULL;
|
|
}
|
|
|
|
int __init
|
|
xfs_bmap_intent_init_cache(void)
|
|
{
|
|
xfs_bmap_intent_cache = kmem_cache_create("xfs_bmap_intent",
|
|
sizeof(struct xfs_bmap_intent),
|
|
0, 0, NULL);
|
|
|
|
return xfs_bmap_intent_cache != NULL ? 0 : -ENOMEM;
|
|
}
|
|
|
|
void
|
|
xfs_bmap_intent_destroy_cache(void)
|
|
{
|
|
kmem_cache_destroy(xfs_bmap_intent_cache);
|
|
xfs_bmap_intent_cache = NULL;
|
|
}
|