240 lines
7.6 KiB
C
240 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef __XFS_INODE_FORK_H__
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#define __XFS_INODE_FORK_H__
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struct xfs_inode_log_item;
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struct xfs_dinode;
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/*
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* File incore extent information, present for each of data & attr forks.
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*/
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struct xfs_ifork {
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int64_t if_bytes; /* bytes in if_u1 */
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struct xfs_btree_block *if_broot; /* file's incore btree root */
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unsigned int if_seq; /* fork mod counter */
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int if_height; /* height of the extent tree */
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union {
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void *if_root; /* extent tree root */
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char *if_data; /* inline file data */
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} if_u1;
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short if_broot_bytes; /* bytes allocated for root */
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int8_t if_format; /* format of this fork */
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xfs_extnum_t if_nextents; /* # of extents in this fork */
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};
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/*
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* Worst-case increase in the fork extent count when we're adding a single
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* extent to a fork and there's no possibility of splitting an existing mapping.
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*/
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#define XFS_IEXT_ADD_NOSPLIT_CNT (1)
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/*
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* Punching out an extent from the middle of an existing extent can cause the
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* extent count to increase by 1.
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* i.e. | Old extent | Hole | Old extent |
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*/
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#define XFS_IEXT_PUNCH_HOLE_CNT (1)
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/*
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* Directory entry addition can cause the following,
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* 1. Data block can be added/removed.
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* A new extent can cause extent count to increase by 1.
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* 2. Free disk block can be added/removed.
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* Same behaviour as described above for Data block.
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* 3. Dabtree blocks.
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* XFS_DA_NODE_MAXDEPTH blocks can be added. Each of these can be new
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* extents. Hence extent count can increase by XFS_DA_NODE_MAXDEPTH.
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*/
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#define XFS_IEXT_DIR_MANIP_CNT(mp) \
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((XFS_DA_NODE_MAXDEPTH + 1 + 1) * (mp)->m_dir_geo->fsbcount)
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/*
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* Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to
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* be added. One extra extent for dabtree in case a local attr is
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* large enough to cause a double split. It can also cause extent
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* count to increase proportional to the size of a remote xattr's
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* value.
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*/
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#define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) \
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(XFS_DA_NODE_MAXDEPTH + max(1, rmt_blks))
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/*
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* A write to a sub-interval of an existing unwritten extent causes the original
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* extent to be split into 3 extents
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* i.e. | Unwritten | Real | Unwritten |
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* Hence extent count can increase by 2.
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*/
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#define XFS_IEXT_WRITE_UNWRITTEN_CNT (2)
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/*
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* Moving an extent to data fork can cause a sub-interval of an existing extent
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* to be unmapped. This will increase extent count by 1. Mapping in the new
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* extent can increase the extent count by 1 again i.e.
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* | Old extent | New extent | Old extent |
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* Hence number of extents increases by 2.
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*/
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#define XFS_IEXT_REFLINK_END_COW_CNT (2)
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/*
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* Removing an initial range of source/donor file's extent and adding a new
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* extent (from donor/source file) in its place will cause extent count to
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* increase by 1.
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*/
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#define XFS_IEXT_SWAP_RMAP_CNT (1)
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/*
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* Fork handling.
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*/
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#define XFS_IFORK_Q(ip) ((ip)->i_forkoff != 0)
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#define XFS_IFORK_BOFF(ip) ((int)((ip)->i_forkoff << 3))
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#define XFS_IFORK_PTR(ip,w) \
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((w) == XFS_DATA_FORK ? \
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&(ip)->i_df : \
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((w) == XFS_ATTR_FORK ? \
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(ip)->i_afp : \
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(ip)->i_cowfp))
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#define XFS_IFORK_DSIZE(ip) \
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(XFS_IFORK_Q(ip) ? XFS_IFORK_BOFF(ip) : XFS_LITINO((ip)->i_mount))
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#define XFS_IFORK_ASIZE(ip) \
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(XFS_IFORK_Q(ip) ? XFS_LITINO((ip)->i_mount) - XFS_IFORK_BOFF(ip) : 0)
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#define XFS_IFORK_SIZE(ip,w) \
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((w) == XFS_DATA_FORK ? \
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XFS_IFORK_DSIZE(ip) : \
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((w) == XFS_ATTR_FORK ? \
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XFS_IFORK_ASIZE(ip) : \
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0))
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#define XFS_IFORK_MAXEXT(ip, w) \
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(XFS_IFORK_SIZE(ip, w) / sizeof(xfs_bmbt_rec_t))
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static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp)
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{
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return ifp->if_format == XFS_DINODE_FMT_EXTENTS ||
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ifp->if_format == XFS_DINODE_FMT_BTREE;
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}
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static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp)
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{
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if (!ifp)
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return 0;
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return ifp->if_nextents;
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}
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static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp)
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{
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if (!ifp)
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return XFS_DINODE_FMT_EXTENTS;
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return ifp->if_format;
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}
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struct xfs_ifork *xfs_ifork_alloc(enum xfs_dinode_fmt format,
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xfs_extnum_t nextents);
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struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
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int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *);
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int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *);
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void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *,
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struct xfs_inode_log_item *, int);
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void xfs_idestroy_fork(struct xfs_ifork *ifp);
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void xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff,
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int whichfork);
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void xfs_iroot_realloc(struct xfs_inode *, int, int);
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int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int);
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int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *,
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int);
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void xfs_init_local_fork(struct xfs_inode *ip, int whichfork,
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const void *data, int64_t size);
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xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp);
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void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur,
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struct xfs_bmbt_irec *, int);
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void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *,
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int);
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void xfs_iext_destroy(struct xfs_ifork *);
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bool xfs_iext_lookup_extent(struct xfs_inode *ip,
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struct xfs_ifork *ifp, xfs_fileoff_t bno,
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struct xfs_iext_cursor *cur,
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struct xfs_bmbt_irec *gotp);
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bool xfs_iext_lookup_extent_before(struct xfs_inode *ip,
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struct xfs_ifork *ifp, xfs_fileoff_t *end,
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struct xfs_iext_cursor *cur,
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struct xfs_bmbt_irec *gotp);
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bool xfs_iext_get_extent(struct xfs_ifork *ifp,
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struct xfs_iext_cursor *cur,
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struct xfs_bmbt_irec *gotp);
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void xfs_iext_update_extent(struct xfs_inode *ip, int state,
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struct xfs_iext_cursor *cur,
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struct xfs_bmbt_irec *gotp);
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void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *);
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void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *);
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void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *);
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void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *);
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static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp,
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struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
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{
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xfs_iext_next(ifp, cur);
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return xfs_iext_get_extent(ifp, cur, gotp);
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}
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static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp,
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struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
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{
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xfs_iext_prev(ifp, cur);
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return xfs_iext_get_extent(ifp, cur, gotp);
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}
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/*
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* Return the extent after cur in gotp without updating the cursor.
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*/
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static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp,
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struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
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{
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struct xfs_iext_cursor ncur = *cur;
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xfs_iext_next(ifp, &ncur);
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return xfs_iext_get_extent(ifp, &ncur, gotp);
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}
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/*
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* Return the extent before cur in gotp without updating the cursor.
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*/
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static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp,
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struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp)
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{
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struct xfs_iext_cursor ncur = *cur;
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xfs_iext_prev(ifp, &ncur);
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return xfs_iext_get_extent(ifp, &ncur, gotp);
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}
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#define for_each_xfs_iext(ifp, ext, got) \
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for (xfs_iext_first((ifp), (ext)); \
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xfs_iext_get_extent((ifp), (ext), (got)); \
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xfs_iext_next((ifp), (ext)))
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extern struct kmem_zone *xfs_ifork_zone;
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extern void xfs_ifork_init_cow(struct xfs_inode *ip);
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int xfs_ifork_verify_local_data(struct xfs_inode *ip);
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int xfs_ifork_verify_local_attr(struct xfs_inode *ip);
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int xfs_iext_count_may_overflow(struct xfs_inode *ip, int whichfork,
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int nr_to_add);
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/* returns true if the fork has extents but they are not read in yet. */
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static inline bool xfs_need_iread_extents(struct xfs_ifork *ifp)
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{
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return ifp->if_format == XFS_DINODE_FMT_BTREE && ifp->if_height == 0;
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}
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#endif /* __XFS_INODE_FORK_H__ */
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