398 lines
13 KiB
C
398 lines
13 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_BMAP_H__
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#define __XFS_BMAP_H__
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struct getbmap;
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struct xfs_bmbt_irec;
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struct xfs_ifork;
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struct xfs_inode;
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struct xfs_mount;
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struct xfs_trans;
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extern kmem_zone_t *xfs_bmap_free_item_zone;
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/*
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* DELTA: describe a change to the in-core extent list.
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*
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* Internally the use of xed_blockount is somewhat funky.
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* xed_blockcount contains an offset much of the time because this
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* makes merging changes easier. (xfs_fileoff_t and xfs_filblks_t are
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* the same underlying type).
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*/
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typedef struct xfs_extdelta
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{
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xfs_fileoff_t xed_startoff; /* offset of range */
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xfs_filblks_t xed_blockcount; /* blocks in range */
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} xfs_extdelta_t;
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/*
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* List of extents to be free "later".
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* The list is kept sorted on xbf_startblock.
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*/
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typedef struct xfs_bmap_free_item
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{
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xfs_fsblock_t xbfi_startblock;/* starting fs block number */
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xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */
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struct xfs_bmap_free_item *xbfi_next; /* link to next entry */
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} xfs_bmap_free_item_t;
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/*
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* Header for free extent list.
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*
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* xbf_low is used by the allocator to activate the lowspace algorithm -
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* when free space is running low the extent allocator may choose to
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* allocate an extent from an AG without leaving sufficient space for
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* a btree split when inserting the new extent. In this case the allocator
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* will enable the lowspace algorithm which is supposed to allow further
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* allocations (such as btree splits and newroots) to allocate from
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* sequential AGs. In order to avoid locking AGs out of order the lowspace
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* algorithm will start searching for free space from AG 0. If the correct
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* transaction reservations have been made then this algorithm will eventually
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* find all the space it needs.
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*/
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typedef struct xfs_bmap_free
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{
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xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */
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int xbf_count; /* count of items on list */
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int xbf_low; /* alloc in low mode */
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} xfs_bmap_free_t;
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#define XFS_BMAP_MAX_NMAP 4
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/*
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* Flags for xfs_bmapi
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*/
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#define XFS_BMAPI_WRITE 0x001 /* write operation: allocate space */
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#define XFS_BMAPI_DELAY 0x002 /* delayed write operation */
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#define XFS_BMAPI_ENTIRE 0x004 /* return entire extent, not trimmed */
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#define XFS_BMAPI_METADATA 0x008 /* mapping metadata not user data */
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#define XFS_BMAPI_EXACT 0x010 /* allocate only to spec'd bounds */
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#define XFS_BMAPI_ATTRFORK 0x020 /* use attribute fork not data */
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#define XFS_BMAPI_ASYNC 0x040 /* bunmapi xactions can be async */
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#define XFS_BMAPI_RSVBLOCKS 0x080 /* OK to alloc. reserved data blocks */
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#define XFS_BMAPI_PREALLOC 0x100 /* preallocation op: unwritten space */
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#define XFS_BMAPI_IGSTATE 0x200 /* Ignore state - */
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/* combine contig. space */
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#define XFS_BMAPI_CONTIG 0x400 /* must allocate only one extent */
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/* XFS_BMAPI_DIRECT_IO 0x800 */
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#define XFS_BMAPI_CONVERT 0x1000 /* unwritten extent conversion - */
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/* need write cache flushing and no */
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/* additional allocation alignments */
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static inline int xfs_bmapi_aflag(int w)
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{
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return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
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}
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/*
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* Special values for xfs_bmbt_irec_t br_startblock field.
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*/
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#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
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#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
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static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
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{
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((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
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(flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK);
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}
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/*
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* Argument structure for xfs_bmap_alloc.
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*/
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typedef struct xfs_bmalloca {
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xfs_fsblock_t firstblock; /* i/o first block allocated */
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xfs_fsblock_t rval; /* starting block of new extent */
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xfs_fileoff_t off; /* offset in file filling in */
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struct xfs_trans *tp; /* transaction pointer */
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struct xfs_inode *ip; /* incore inode pointer */
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struct xfs_bmbt_irec *prevp; /* extent before the new one */
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struct xfs_bmbt_irec *gotp; /* extent after, or delayed */
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xfs_extlen_t alen; /* i/o length asked/allocated */
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xfs_extlen_t total; /* total blocks needed for xaction */
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xfs_extlen_t minlen; /* minimum allocation size (blocks) */
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xfs_extlen_t minleft; /* amount must be left after alloc */
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char eof; /* set if allocating past last extent */
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char wasdel; /* replacing a delayed allocation */
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char userdata;/* set if is user data */
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char low; /* low on space, using seq'l ags */
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char aeof; /* allocated space at eof */
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char conv; /* overwriting unwritten extents */
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} xfs_bmalloca_t;
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#if defined(__KERNEL__) && defined(XFS_BMAP_TRACE)
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/*
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* Trace operations for bmap extent tracing
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*/
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#define XFS_BMAP_KTRACE_DELETE 1
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#define XFS_BMAP_KTRACE_INSERT 2
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#define XFS_BMAP_KTRACE_PRE_UP 3
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#define XFS_BMAP_KTRACE_POST_UP 4
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#define XFS_BMAP_TRACE_SIZE 4096 /* size of global trace buffer */
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#define XFS_BMAP_KTRACE_SIZE 32 /* size of per-inode trace buffer */
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extern ktrace_t *xfs_bmap_trace_buf;
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/*
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* Add bmap trace insert entries for all the contents of the extent list.
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*/
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void
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xfs_bmap_trace_exlist(
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const char *fname, /* function name */
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struct xfs_inode *ip, /* incore inode pointer */
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xfs_extnum_t cnt, /* count of entries in list */
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int whichfork); /* data or attr fork */
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
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xfs_bmap_trace_exlist(__func__,ip,c,w)
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#else /* __KERNEL__ && XFS_BMAP_TRACE */
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w)
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#endif /* __KERNEL__ && XFS_BMAP_TRACE */
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/*
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* Convert inode from non-attributed to attributed.
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* Must not be in a transaction, ip must not be locked.
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*/
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int /* error code */
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xfs_bmap_add_attrfork(
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struct xfs_inode *ip, /* incore inode pointer */
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int size, /* space needed for new attribute */
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int rsvd); /* flag for reserved block allocation */
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/*
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* Add the extent to the list of extents to be free at transaction end.
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* The list is maintained sorted (by block number).
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*/
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void
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xfs_bmap_add_free(
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xfs_fsblock_t bno, /* fs block number of extent */
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xfs_filblks_t len, /* length of extent */
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xfs_bmap_free_t *flist, /* list of extents */
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struct xfs_mount *mp); /* mount point structure */
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/*
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* Routine to clean up the free list data structure when
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* an error occurs during a transaction.
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*/
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void
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xfs_bmap_cancel(
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xfs_bmap_free_t *flist); /* free list to clean up */
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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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struct xfs_mount *mp, /* file system mount structure */
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int whichfork); /* data or attr fork */
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/*
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* Returns the file-relative block number of the first unused block in the file.
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* This is the lowest-address hole if the file has holes, else the first block
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* past the end of file.
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*/
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int /* error */
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xfs_bmap_first_unused(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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xfs_extlen_t len, /* size of hole to find */
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xfs_fileoff_t *unused, /* unused block num */
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int whichfork); /* data or attr fork */
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/*
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* Returns the file-relative block number of the last block + 1 before
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* last_block (input value) in the file.
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* This is not based on i_size, it is based on the extent list.
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* Returns 0 for local files, as they do not have an extent list.
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*/
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int /* error */
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xfs_bmap_last_before(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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xfs_fileoff_t *last_block, /* last block */
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int whichfork); /* data or attr fork */
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/*
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* Returns the file-relative block number of the first block past eof in
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* the file. This is not based on i_size, it is based on the extent list.
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* Returns 0 for local files, as they do not have an extent list.
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*/
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int /* error */
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xfs_bmap_last_offset(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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xfs_fileoff_t *unused, /* last block num */
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int whichfork); /* data or attr fork */
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/*
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* Returns whether the selected fork of the inode has exactly one
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* block or not. For the data fork we check this matches di_size,
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* implying the file's range is 0..bsize-1.
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*/
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int
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xfs_bmap_one_block(
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struct xfs_inode *ip, /* incore inode */
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int whichfork); /* data or attr fork */
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/*
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* Read in the extents to iu_extents.
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* All inode fields are set up by caller, we just traverse the btree
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* and copy the records in.
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*/
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int /* error */
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xfs_bmap_read_extents(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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int whichfork); /* data or attr fork */
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/*
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* Map file blocks to filesystem blocks.
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* File range is given by the bno/len pair.
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* Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
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* into a hole or past eof.
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* Only allocates blocks from a single allocation group,
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* to avoid locking problems.
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* The returned value in "firstblock" from the first call in a transaction
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* must be remembered and presented to subsequent calls in "firstblock".
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* An upper bound for the number of blocks to be allocated is supplied to
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* the first call in "total"; if no allocation group has that many free
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* blocks then the call will fail (return NULLFSBLOCK in "firstblock").
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*/
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int /* error */
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xfs_bmapi(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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xfs_fileoff_t bno, /* starting file offs. mapped */
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xfs_filblks_t len, /* length to map in file */
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int flags, /* XFS_BMAPI_... */
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xfs_fsblock_t *firstblock, /* first allocated block
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controls a.g. for allocs */
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xfs_extlen_t total, /* total blocks needed */
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struct xfs_bmbt_irec *mval, /* output: map values */
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int *nmap, /* i/o: mval size/count */
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xfs_bmap_free_t *flist, /* i/o: list extents to free */
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xfs_extdelta_t *delta); /* o: change made to incore
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extents */
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/*
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* Map file blocks to filesystem blocks, simple version.
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* One block only, read-only.
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* For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
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* For the other flag values, the effect is as if XFS_BMAPI_METADATA
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* was set and all the others were clear.
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*/
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int /* error */
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xfs_bmapi_single(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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int whichfork, /* data or attr fork */
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xfs_fsblock_t *fsb, /* output: mapped block */
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xfs_fileoff_t bno); /* starting file offs. mapped */
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/*
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* Unmap (remove) blocks from a file.
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* If nexts is nonzero then the number of extents to remove is limited to
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* that value. If not all extents in the block range can be removed then
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* *done is set.
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*/
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int /* error */
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xfs_bunmapi(
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_inode *ip, /* incore inode */
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xfs_fileoff_t bno, /* starting offset to unmap */
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xfs_filblks_t len, /* length to unmap in file */
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int flags, /* XFS_BMAPI_... */
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xfs_extnum_t nexts, /* number of extents max */
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xfs_fsblock_t *firstblock, /* first allocated block
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controls a.g. for allocs */
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xfs_bmap_free_t *flist, /* i/o: list extents to free */
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xfs_extdelta_t *delta, /* o: change made to incore
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extents */
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int *done); /* set if not done yet */
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/*
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* Check an extent list, which has just been read, for
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* any bit in the extent flag field.
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*/
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int
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xfs_check_nostate_extents(
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struct xfs_ifork *ifp,
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xfs_extnum_t idx,
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xfs_extnum_t num);
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uint
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xfs_default_attroffset(
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struct xfs_inode *ip);
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#ifdef __KERNEL__
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/*
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* Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
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* caller. Frees all the extents that need freeing, which must be done
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* last due to locking considerations.
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*
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* Return 1 if the given transaction was committed and a new one allocated,
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* and 0 otherwise.
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*/
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int /* error */
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xfs_bmap_finish(
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struct xfs_trans **tp, /* transaction pointer addr */
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xfs_bmap_free_t *flist, /* i/o: list extents to free */
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int *committed); /* xact committed or not */
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/* bmap to userspace formatter - copy to user & advance pointer */
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typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
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/*
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* Get inode's extents as described in bmv, and format for output.
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*/
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int /* error code */
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xfs_getbmap(
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xfs_inode_t *ip,
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struct getbmapx *bmv, /* user bmap structure */
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xfs_bmap_format_t formatter, /* format to user */
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void *arg); /* formatter arg */
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/*
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* Check if the endoff is outside the last extent. If so the caller will grow
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* the allocation to a stripe unit boundary
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*/
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int
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xfs_bmap_eof(
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struct xfs_inode *ip,
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xfs_fileoff_t endoff,
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int whichfork,
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int *eof);
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/*
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* Count fsblocks of the given fork.
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*/
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int
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xfs_bmap_count_blocks(
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xfs_trans_t *tp,
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struct xfs_inode *ip,
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int whichfork,
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int *count);
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#endif /* __KERNEL__ */
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#endif /* __XFS_BMAP_H__ */
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