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Diffstat (limited to '')
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.h | 270 |
1 files changed, 270 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h new file mode 100644 index 000000000..16db95b11 --- /dev/null +++ b/fs/xfs/libxfs/xfs_bmap.h @@ -0,0 +1,270 @@ +/* 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__ */ |