| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| */ |
| #ifndef __XFS_BMAP_H__ |
| #define __XFS_BMAP_H__ |
| |
| struct getbmap; |
| struct xfs_bmbt_irec; |
| struct xfs_ifork; |
| struct xfs_inode; |
| struct xfs_mount; |
| struct xfs_trans; |
| struct xfs_alloc_arg; |
| |
| /* |
| * Argument structure for xfs_bmap_alloc. |
| */ |
| struct xfs_bmalloca { |
| struct xfs_trans *tp; /* transaction pointer */ |
| struct xfs_inode *ip; /* incore inode pointer */ |
| struct xfs_bmbt_irec prev; /* extent before the new one */ |
| struct xfs_bmbt_irec got; /* extent after, or delayed */ |
| |
| xfs_fileoff_t offset; /* offset in file filling in */ |
| xfs_extlen_t length; /* i/o length asked/allocated */ |
| xfs_fsblock_t blkno; /* starting block of new extent */ |
| |
| struct xfs_btree_cur *cur; /* btree cursor */ |
| struct xfs_iext_cursor icur; /* incore extent cursor */ |
| int nallocs;/* number of extents alloc'd */ |
| int logflags;/* flags for transaction logging */ |
| |
| xfs_extlen_t total; /* total blocks needed for xaction */ |
| xfs_extlen_t minlen; /* minimum allocation size (blocks) */ |
| xfs_extlen_t minleft; /* amount must be left after alloc */ |
| bool eof; /* set if allocating past last extent */ |
| bool wasdel; /* replacing a delayed allocation */ |
| bool aeof; /* allocated space at eof */ |
| bool conv; /* overwriting unwritten extents */ |
| int datatype;/* data type being allocated */ |
| uint32_t flags; |
| }; |
| |
| #define XFS_BMAP_MAX_NMAP 4 |
| |
| /* |
| * Flags for xfs_bmapi_* |
| */ |
| #define XFS_BMAPI_ENTIRE (1u << 0) /* return entire extent untrimmed */ |
| #define XFS_BMAPI_METADATA (1u << 1) /* mapping metadata not user data */ |
| #define XFS_BMAPI_ATTRFORK (1u << 2) /* use attribute fork not data */ |
| #define XFS_BMAPI_PREALLOC (1u << 3) /* preallocating unwritten space */ |
| #define XFS_BMAPI_CONTIG (1u << 4) /* must allocate only one extent */ |
| /* |
| * unwritten extent conversion - this needs write cache flushing and no additional |
| * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts |
| * from written to unwritten, otherwise convert from unwritten to written. |
| */ |
| #define XFS_BMAPI_CONVERT (1u << 5) |
| |
| /* |
| * allocate zeroed extents - this requires all newly allocated user data extents |
| * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set. |
| * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found |
| * during the allocation range to zeroed written extents. |
| */ |
| #define XFS_BMAPI_ZERO (1u << 6) |
| |
| /* |
| * Map the inode offset to the block given in ap->firstblock. Primarily |
| * used for reflink. The range must be in a hole, and this flag cannot be |
| * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork. |
| * |
| * For bunmapi, this flag unmaps the range without adjusting quota, reducing |
| * refcount, or freeing the blocks. |
| */ |
| #define XFS_BMAPI_REMAP (1u << 7) |
| |
| /* Map something in the CoW fork. */ |
| #define XFS_BMAPI_COWFORK (1u << 8) |
| |
| /* Skip online discard of freed extents */ |
| #define XFS_BMAPI_NODISCARD (1u << 9) |
| |
| /* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */ |
| #define XFS_BMAPI_NORMAP (1u << 10) |
| |
| #define XFS_BMAPI_FLAGS \ |
| { XFS_BMAPI_ENTIRE, "ENTIRE" }, \ |
| { XFS_BMAPI_METADATA, "METADATA" }, \ |
| { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \ |
| { XFS_BMAPI_PREALLOC, "PREALLOC" }, \ |
| { XFS_BMAPI_CONTIG, "CONTIG" }, \ |
| { XFS_BMAPI_CONVERT, "CONVERT" }, \ |
| { XFS_BMAPI_ZERO, "ZERO" }, \ |
| { XFS_BMAPI_REMAP, "REMAP" }, \ |
| { XFS_BMAPI_COWFORK, "COWFORK" }, \ |
| { XFS_BMAPI_NODISCARD, "NODISCARD" }, \ |
| { XFS_BMAPI_NORMAP, "NORMAP" } |
| |
| |
| static inline int xfs_bmapi_aflag(int w) |
| { |
| return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : |
| (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0)); |
| } |
| |
| static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags) |
| { |
| if (bmapi_flags & XFS_BMAPI_COWFORK) |
| return XFS_COW_FORK; |
| else if (bmapi_flags & XFS_BMAPI_ATTRFORK) |
| return XFS_ATTR_FORK; |
| return XFS_DATA_FORK; |
| } |
| |
| void xfs_bmap_alloc_account(struct xfs_bmalloca *ap); |
| |
| /* |
| * Special values for xfs_bmbt_irec_t br_startblock field. |
| */ |
| #define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL) |
| #define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL) |
| |
| /* |
| * Flags for xfs_bmap_add_extent*. |
| */ |
| #define BMAP_LEFT_CONTIG (1u << 0) |
| #define BMAP_RIGHT_CONTIG (1u << 1) |
| #define BMAP_LEFT_FILLING (1u << 2) |
| #define BMAP_RIGHT_FILLING (1u << 3) |
| #define BMAP_LEFT_DELAY (1u << 4) |
| #define BMAP_RIGHT_DELAY (1u << 5) |
| #define BMAP_LEFT_VALID (1u << 6) |
| #define BMAP_RIGHT_VALID (1u << 7) |
| #define BMAP_ATTRFORK (1u << 8) |
| #define BMAP_COWFORK (1u << 9) |
| |
| #define XFS_BMAP_EXT_FLAGS \ |
| { BMAP_LEFT_CONTIG, "LC" }, \ |
| { BMAP_RIGHT_CONTIG, "RC" }, \ |
| { BMAP_LEFT_FILLING, "LF" }, \ |
| { BMAP_RIGHT_FILLING, "RF" }, \ |
| { BMAP_ATTRFORK, "ATTR" }, \ |
| { BMAP_COWFORK, "COW" } |
| |
| /* Return true if the extent is an allocated extent, written or not. */ |
| static inline bool xfs_bmap_is_real_extent(const struct xfs_bmbt_irec *irec) |
| { |
| return irec->br_startblock != HOLESTARTBLOCK && |
| irec->br_startblock != DELAYSTARTBLOCK && |
| !isnullstartblock(irec->br_startblock); |
| } |
| |
| /* |
| * Return true if the extent is a real, allocated extent, or false if it is a |
| * delayed allocation, and unwritten extent or a hole. |
| */ |
| static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec) |
| { |
| return xfs_bmap_is_real_extent(irec) && |
| irec->br_state != XFS_EXT_UNWRITTEN; |
| } |
| |
| /* |
| * Check the mapping for obviously garbage allocations that could trash the |
| * filesystem immediately. |
| */ |
| #define xfs_valid_startblock(ip, startblock) \ |
| ((startblock) != 0 || XFS_IS_REALTIME_INODE(ip)) |
| |
| int xfs_bmap_longest_free_extent(struct xfs_perag *pag, |
| struct xfs_trans *tp, xfs_extlen_t *blen); |
| void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno, |
| xfs_filblks_t len); |
| unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp); |
| int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd); |
| void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp, |
| struct xfs_inode *ip, int whichfork); |
| void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork); |
| int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork); |
| int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t *last_block, int whichfork); |
| int xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused, |
| int whichfork); |
| 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); |
| int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, |
| xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap); |
| int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags, |
| xfs_extnum_t nexts, int *done); |
| int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork, |
| struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, |
| struct xfs_bmbt_irec *del); |
| void xfs_bmap_del_extent_cow(struct xfs_inode *ip, |
| struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got, |
| struct xfs_bmbt_irec *del); |
| uint xfs_default_attroffset(struct xfs_inode *ip); |
| 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); |
| 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); |
| int xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip, |
| xfs_fileoff_t split_offset); |
| 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 *cur, |
| int eof); |
| int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork, |
| xfs_off_t offset, struct iomap *iomap, unsigned int *seq); |
| int xfs_bmap_add_extent_unwritten_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); |
| xfs_extlen_t xfs_bmapi_minleft(struct xfs_trans *tp, struct xfs_inode *ip, |
| int fork); |
| int xfs_bmap_btalloc_low_space(struct xfs_bmalloca *ap, |
| struct xfs_alloc_arg *args); |
| |
| enum xfs_bmap_intent_type { |
| XFS_BMAP_MAP = 1, |
| XFS_BMAP_UNMAP, |
| }; |
| |
| struct xfs_bmap_intent { |
| struct list_head bi_list; |
| enum xfs_bmap_intent_type bi_type; |
| int bi_whichfork; |
| struct xfs_inode *bi_owner; |
| struct xfs_perag *bi_pag; |
| struct xfs_bmbt_irec bi_bmap; |
| }; |
| |
| void xfs_bmap_update_get_group(struct xfs_mount *mp, |
| struct xfs_bmap_intent *bi); |
| |
| int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_bmap_intent *bi); |
| void xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip, |
| struct xfs_bmbt_irec *imap); |
| void xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip, |
| struct xfs_bmbt_irec *imap); |
| |
| static inline uint32_t xfs_bmap_fork_to_state(int whichfork) |
| { |
| switch (whichfork) { |
| case XFS_ATTR_FORK: |
| return BMAP_ATTRFORK; |
| case XFS_COW_FORK: |
| return BMAP_COWFORK; |
| default: |
| return 0; |
| } |
| } |
| |
| xfs_failaddr_t xfs_bmap_validate_extent_raw(struct xfs_mount *mp, bool rtfile, |
| int whichfork, struct xfs_bmbt_irec *irec); |
| xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork, |
| struct xfs_bmbt_irec *irec); |
| int xfs_bmap_complain_bad_rec(struct xfs_inode *ip, int whichfork, |
| xfs_failaddr_t fa, const struct xfs_bmbt_irec *irec); |
| |
| 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); |
| int xfs_bunmapi_range(struct xfs_trans **tpp, struct xfs_inode *ip, |
| uint32_t flags, xfs_fileoff_t startoff, xfs_fileoff_t endoff); |
| |
| extern struct kmem_cache *xfs_bmap_intent_cache; |
| |
| int __init xfs_bmap_intent_init_cache(void); |
| void xfs_bmap_intent_destroy_cache(void); |
| |
| #endif /* __XFS_BMAP_H__ */ |