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