123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270 |
- /* 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;
- /*
- * 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;
- }
- /*
- * 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(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))
- 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 *rlen, uint32_t flags,
- xfs_extnum_t nexts);
- 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);
- 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_bmbt_irec bi_bmap;
- };
- int xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_inode *ip,
- enum xfs_bmap_intent_type type, int whichfork,
- xfs_fileoff_t startoff, xfs_fsblock_t startblock,
- xfs_filblks_t *blockcount, xfs_exntst_t state);
- 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(struct xfs_inode *ip, int whichfork,
- 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);
- 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__ */
|