// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. * All Rights Reserved. */ #ifndef __XFS_INODE_FORK_H__ #define __XFS_INODE_FORK_H__ struct xfs_inode_log_item; struct xfs_dinode; /* * File incore extent information, present for each of data & attr forks. */ struct xfs_ifork { … }; /* * Worst-case increase in the fork extent count when we're adding a single * extent to a fork and there's no possibility of splitting an existing mapping. */ #define XFS_IEXT_ADD_NOSPLIT_CNT … /* * Punching out an extent from the middle of an existing extent can cause the * extent count to increase by 1. * i.e. | Old extent | Hole | Old extent | */ #define XFS_IEXT_PUNCH_HOLE_CNT … /* * Adding/removing an xattr can cause XFS_DA_NODE_MAXDEPTH extents to * be added. One extra extent for dabtree in case a local attr is * large enough to cause a double split. It can also cause extent * count to increase proportional to the size of a remote xattr's * value. */ #define XFS_IEXT_ATTR_MANIP_CNT(rmt_blks) … /* * A write to a sub-interval of an existing unwritten extent causes the original * extent to be split into 3 extents * i.e. | Unwritten | Real | Unwritten | * Hence extent count can increase by 2. */ #define XFS_IEXT_WRITE_UNWRITTEN_CNT … /* * Moving an extent to data fork can cause a sub-interval of an existing extent * to be unmapped. This will increase extent count by 1. Mapping in the new * extent can increase the extent count by 1 again i.e. * | Old extent | New extent | Old extent | * Hence number of extents increases by 2. */ #define XFS_IEXT_REFLINK_END_COW_CNT … /* * Removing an initial range of source/donor file's extent and adding a new * extent (from donor/source file) in its place will cause extent count to * increase by 1. */ #define XFS_IEXT_SWAP_RMAP_CNT … /* * Fork handling. */ #define XFS_IFORK_MAXEXT(ip, w) … static inline bool xfs_ifork_has_extents(struct xfs_ifork *ifp) { … } static inline xfs_extnum_t xfs_ifork_nextents(struct xfs_ifork *ifp) { … } static inline int8_t xfs_ifork_format(struct xfs_ifork *ifp) { … } static inline xfs_extnum_t xfs_iext_max_nextents(bool has_large_extent_counts, int whichfork) { … } static inline xfs_extnum_t xfs_dfork_data_extents( struct xfs_dinode *dip) { … } static inline xfs_extnum_t xfs_dfork_attr_extents( struct xfs_dinode *dip) { … } static inline xfs_extnum_t xfs_dfork_nextents( struct xfs_dinode *dip, int whichfork) { … } void xfs_ifork_zap_attr(struct xfs_inode *ip); void xfs_ifork_init_attr(struct xfs_inode *ip, enum xfs_dinode_fmt format, xfs_extnum_t nextents); struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state); int xfs_iformat_data_fork(struct xfs_inode *, struct xfs_dinode *); int xfs_iformat_attr_fork(struct xfs_inode *, struct xfs_dinode *); void xfs_iflush_fork(struct xfs_inode *, struct xfs_dinode *, struct xfs_inode_log_item *, int); void xfs_idestroy_fork(struct xfs_ifork *ifp); void * xfs_idata_realloc(struct xfs_inode *ip, int64_t byte_diff, int whichfork); void xfs_iroot_realloc(struct xfs_inode *, int, int); int xfs_iread_extents(struct xfs_trans *, struct xfs_inode *, int); int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *, int); void xfs_init_local_fork(struct xfs_inode *ip, int whichfork, const void *data, int64_t size); xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp); void xfs_iext_insert_raw(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *irec); void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *, int); void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *, int); void xfs_iext_destroy(struct xfs_ifork *); bool xfs_iext_lookup_extent(struct xfs_inode *ip, struct xfs_ifork *ifp, xfs_fileoff_t bno, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp); bool xfs_iext_lookup_extent_before(struct xfs_inode *ip, struct xfs_ifork *ifp, xfs_fileoff_t *end, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp); bool xfs_iext_get_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp); void xfs_iext_update_extent(struct xfs_inode *ip, int state, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp); void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *); void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *); void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *); void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *); static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp) { … } static inline bool xfs_iext_prev_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp) { … } /* * Return the extent after cur in gotp without updating the cursor. */ static inline bool xfs_iext_peek_next_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp) { … } /* * Return the extent before cur in gotp without updating the cursor. */ static inline bool xfs_iext_peek_prev_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp) { … } #define for_each_xfs_iext(ifp, ext, got) … extern struct kmem_cache *xfs_ifork_cache; extern void xfs_ifork_init_cow(struct xfs_inode *ip); int xfs_ifork_verify_local_data(struct xfs_inode *ip); int xfs_ifork_verify_local_attr(struct xfs_inode *ip); int xfs_iext_count_extend(struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, uint nr_to_add); bool xfs_ifork_is_realtime(struct xfs_inode *ip, int whichfork); /* returns true if the fork has extents but they are not read in yet. */ static inline bool xfs_need_iread_extents(const struct xfs_ifork *ifp) { … } #endif /* __XFS_INODE_FORK_H__ */
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