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239 lines
7.5 KiB
239 lines
7.5 KiB
// 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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unsigned char if_flags; /* per-fork flags */ |
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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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* Per-fork incore inode flags. |
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*/ |
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#define XFS_IFINLINE 0x01 /* Inline data is read in */ |
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#define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */ |
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#define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */ |
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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_d.di_forkoff != 0) |
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#define XFS_IFORK_BOFF(ip) ((int)((ip)->i_d.di_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_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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#endif /* __XFS_INODE_FORK_H__ */
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