// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2006 Silicon Graphics, Inc. * All Rights Reserved. */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_shared.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_bit.h" #include "xfs_sb.h" #include "xfs_mount.h" #include "xfs_defer.h" #include "xfs_dir2.h" #include "xfs_inode.h" #include "xfs_btree.h" #include "xfs_trans.h" #include "xfs_alloc.h" #include "xfs_bmap.h" #include "xfs_bmap_util.h" #include "xfs_bmap_btree.h" #include "xfs_rtbitmap.h" #include "xfs_errortag.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_trans_space.h" #include "xfs_buf_item.h" #include "xfs_trace.h" #include "xfs_attr_leaf.h" #include "xfs_filestream.h" #include "xfs_rmap.h" #include "xfs_ag.h" #include "xfs_ag_resv.h" #include "xfs_refcount.h" #include "xfs_icache.h" #include "xfs_iomap.h" #include "xfs_health.h" #include "xfs_bmap_item.h" #include "xfs_symlink_remote.h" #include "xfs_inode_util.h" struct kmem_cache *xfs_bmap_intent_cache; /* * Miscellaneous helper functions */ /* * Compute and fill in the value of the maximum depth of a bmap btree * in this filesystem. Done once, during mount. */ void xfs_bmap_compute_maxlevels( xfs_mount_t *mp, /* file system mount structure */ int whichfork) /* data or attr fork */ { … } unsigned int xfs_bmap_compute_attr_offset( struct xfs_mount *mp) { … } STATIC int /* error */ xfs_bmbt_lookup_eq( struct xfs_btree_cur *cur, struct xfs_bmbt_irec *irec, int *stat) /* success/failure */ { … } STATIC int /* error */ xfs_bmbt_lookup_first( struct xfs_btree_cur *cur, int *stat) /* success/failure */ { … } /* * Check if the inode needs to be converted to btree format. */ static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork) { … } /* * Check if the inode should be converted to extent format. */ static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork) { … } /* * Update the record referred to by cur to the value given by irec * This either works (return 0) or gets an EFSCORRUPTED error. */ STATIC int xfs_bmbt_update( struct xfs_btree_cur *cur, struct xfs_bmbt_irec *irec) { … } /* * Compute the worst-case number of indirect blocks that will be used * for ip's delayed extent of length "len". */ STATIC xfs_filblks_t xfs_bmap_worst_indlen( xfs_inode_t *ip, /* incore inode pointer */ xfs_filblks_t len) /* delayed extent length */ { … } /* * Calculate the default attribute fork offset for newly created inodes. */ uint xfs_default_attroffset( struct xfs_inode *ip) { … } /* * Helper routine to reset inode i_forkoff field when switching attribute fork * from local to extent format - we reset it where possible to make space * available for inline data fork extents. */ STATIC void xfs_bmap_forkoff_reset( xfs_inode_t *ip, int whichfork) { … } static int xfs_bmap_read_buf( struct xfs_mount *mp, /* file system mount point */ struct xfs_trans *tp, /* transaction pointer */ xfs_fsblock_t fsbno, /* file system block number */ struct xfs_buf **bpp) /* buffer for fsbno */ { … } #ifdef DEBUG STATIC struct xfs_buf * xfs_bmap_get_bp( struct xfs_btree_cur *cur, xfs_fsblock_t bno) { … } STATIC void xfs_check_block( struct xfs_btree_block *block, xfs_mount_t *mp, int root, short sz) { … } /* * Check that the extents for the inode ip are in the right order in all * btree leaves. THis becomes prohibitively expensive for large extent count * files, so don't bother with inodes that have more than 10,000 extents in * them. The btree record ordering checks will still be done, so for such large * bmapbt constructs that is going to catch most corruptions. */ STATIC void xfs_bmap_check_leaf_extents( struct xfs_btree_cur *cur, /* btree cursor or null */ xfs_inode_t *ip, /* incore inode pointer */ int whichfork) /* data or attr fork */ { … } /* * 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) { … } #else #define xfs_bmap_check_leaf_extents … #define xfs_bmap_validate_ret … #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 */ { … } /* * 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 */ { … } /* * 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) { … } 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, void *priv), void *priv) { … } /* * 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 */ { … } /* * 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 */ { … } /* * 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 */ { … } /* * 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) { … } /* * Convert inode from non-attributed to attributed. Caller must hold the * ILOCK_EXCL and the file cannot have an attr fork. */ int /* error code */ xfs_bmap_add_attrfork( struct xfs_trans *tp, struct xfs_inode *ip, /* incore inode pointer */ int size, /* space new attribute needs */ int rsvd) /* xact may use reserved blks */ { … } /* * Internal and external extent tree search functions. */ struct xfs_iread_state { … }; int xfs_bmap_complain_bad_rec( struct xfs_inode *ip, int whichfork, xfs_failaddr_t fa, const struct xfs_bmbt_irec *irec) { … } /* 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) { … } /* * Read in extents from a btree-format inode. */ int xfs_iread_extents( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork) { … } /* * 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 */ { … } /* * 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 */ { … } int xfs_bmap_last_extent( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *rec, int *is_empty) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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 */ { … } /* * 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 */ { … } /* * 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) { … } /* * 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 */ { … } static inline bool xfs_bmap_adjacent_valid( struct xfs_bmalloca *ap, xfs_fsblock_t x, xfs_fsblock_t y) { … } #define XFS_ALLOC_GAP_UNITS … /* returns true if ap->blkno was modified */ bool xfs_bmap_adjacent( struct xfs_bmalloca *ap) /* bmap alloc argument struct */ { … } int xfs_bmap_longest_free_extent( struct xfs_perag *pag, struct xfs_trans *tp, xfs_extlen_t *blen) { … } static xfs_extlen_t xfs_bmap_select_minlen( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t blen) { … } static int xfs_bmap_btalloc_select_lengths( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, xfs_extlen_t *blen) { … } /* Update all inode and quota accounting for the allocation we just did. */ void xfs_bmap_alloc_account( struct xfs_bmalloca *ap) { … } static int xfs_bmap_compute_alignments( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args) { … } 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) { … } static int xfs_bmap_exact_minlen_extent_alloc( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args) { … } /* * 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) { … } /* * 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) { … } static int xfs_bmap_btalloc_filestreams( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, int stripe_align) { … } static int xfs_bmap_btalloc_best_length( struct xfs_bmalloca *ap, struct xfs_alloc_arg *args, int stripe_align) { … } static int xfs_bmap_btalloc( struct xfs_bmalloca *ap) { … } /* 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } /* * 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) { … } static int xfs_bmapi_allocate( struct xfs_bmalloca *bma) { … } STATIC int xfs_bmapi_convert_unwritten( struct xfs_bmalloca *bma, struct xfs_bmbt_irec *mval, xfs_filblks_t len, uint32_t flags) { … } xfs_extlen_t xfs_bmapi_minleft( struct xfs_trans *tp, struct xfs_inode *ip, int fork) { … } /* * 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) { … } /* * 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 */ { … } /* * 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) { … } /* * 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 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) { … } /* * 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 void xfs_bmap_split_indlen( xfs_filblks_t ores, /* original res. */ xfs_filblks_t *indlen1, /* ext1 worst indlen */ xfs_filblks_t *indlen2) /* ext2 worst indlen */ { … } void 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) { … } 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) { … } /* * 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 */ { … } /* * 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. */ static int __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 */ { … } /* 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) { … } /* * 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 */ { … } /* * 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 */ { … } 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) { … } 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) { … } /* 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) { … } 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) { … } /* * 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) { … } /* Record a bmap intent. */ static inline void __xfs_bmap_add( struct xfs_trans *tp, enum xfs_bmap_intent_type type, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *bmap) { … } /* Map an extent into a file. */ void xfs_bmap_map_extent( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *PREV) { … } /* Unmap an extent out of a file. */ void xfs_bmap_unmap_extent( struct xfs_trans *tp, struct xfs_inode *ip, int whichfork, struct xfs_bmbt_irec *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) { … } /* Check that an extent does not have invalid flags or bad ranges. */ xfs_failaddr_t xfs_bmap_validate_extent_raw( struct xfs_mount *mp, bool rtfile, int whichfork, struct xfs_bmbt_irec *irec) { … } int __init xfs_bmap_intent_init_cache(void) { … } void xfs_bmap_intent_destroy_cache(void) { … } /* 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) { … } /* * Used in xfs_itruncate_extents(). This is the maximum number of extents * freed from a file in a single transaction. */ #define XFS_ITRUNC_MAX_EXTENTS … /* * Unmap every extent in part of an inode's fork. We don't do any higher level * invalidation work at all. */ int xfs_bunmapi_range( struct xfs_trans **tpp, struct xfs_inode *ip, uint32_t flags, xfs_fileoff_t startoff, xfs_fileoff_t endoff) { … } struct xfs_bmap_query_range { … }; /* Format btree record and pass to our callback. */ STATIC int xfs_bmap_query_range_helper( struct xfs_btree_cur *cur, const union xfs_btree_rec *rec, void *priv) { … } /* Find all bmaps. */ int xfs_bmap_query_all( struct xfs_btree_cur *cur, xfs_bmap_query_range_fn fn, void *priv) { … } /* Helper function to extract extent size hint from inode */ xfs_extlen_t xfs_get_extsz_hint( struct xfs_inode *ip) { … } /* * Helper function to extract CoW extent size hint from inode. * Between the extent size hint and the CoW extent size hint, we * return the greater of the two. If the value is zero (automatic), * use the default size. */ xfs_extlen_t xfs_get_cowextsz_hint( struct xfs_inode *ip) { … }
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