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d5753847b2
When we enter xfs_bmbt_alloc_block() without having first allocated a data extent (i.e. tp->t_firstblock == NULLFSBLOCK) because we are doing something like unwritten extent conversion, the transaction block reservation is used as the minleft value. This works for operations like unwritten extent conversion, but it assumes that the block reservation is only for a BMBT split. THis is not always true, and sometimes results in larger than necessary minleft values being set. We only actually need enough space for a btree split, something we already handle correctly in xfs_bmapi_write() via the xfs_bmapi_minleft() calculation. We should use xfs_bmapi_minleft() in xfs_bmbt_alloc_block() to calculate the number of blocks a BMBT split on this inode is going to require, not use the transaction block reservation that contains the maximum number of blocks this transaction may consume in it... Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
269 lines
9.2 KiB
C
269 lines
9.2 KiB
C
/* 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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xfs_extlen_t xfs_bmapi_minleft(struct xfs_trans *tp, struct xfs_inode *ip,
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int fork);
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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_bmap_intent *bi);
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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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