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e1a4e37cc7
In a pathological scenario where we are trying to bunmapi a single extent in which every other block is shared, it's possible that trying to unmap the entire large extent in a single transaction can generate so many EFIs that we overflow the transaction reservation. Therefore, use a heuristic to guess at the number of blocks we can safely unmap from a reflink file's data fork in an single transaction. This should prevent problems such as the log head slamming into the tail and ASSERTs that trigger because we've exceeded the transaction reservation. Note that since bunmapi can fail to unmap the entire range, we must also teach the deferred unmap code to roll into a new transaction whenever we get low on reservation. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> [hch: random edits, all bugs are my fault] Signed-off-by: Christoph Hellwig <hch@lst.de>
280 lines
9.8 KiB
C
280 lines
9.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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extern kmem_zone_t *xfs_bmap_free_item_zone;
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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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xfs_fsblock_t *firstblock; /* i/o first block allocated */
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struct xfs_defer_ops *dfops; /* bmap freelist */
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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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xfs_extnum_t idx; /* current extent index */
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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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int flags;
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};
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/*
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* List of extents to be free "later".
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* The list is kept sorted on xbf_startblock.
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*/
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struct xfs_extent_free_item
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{
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xfs_fsblock_t xefi_startblock;/* starting fs block number */
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xfs_extlen_t xefi_blockcount;/* number of blocks in extent */
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struct list_head xefi_list;
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struct xfs_owner_info xefi_oinfo; /* extent owner */
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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 0x001 /* return entire extent, not trimmed */
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#define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
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#define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
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#define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
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#define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */
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/* combine contig. space */
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#define XFS_BMAPI_CONTIG 0x020 /* 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 0x040
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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 0x080
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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 0x100
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/* Map something in the CoW fork. */
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#define XFS_BMAPI_COWFORK 0x200
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/* Only convert delalloc space, don't allocate entirely new extents */
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#define XFS_BMAPI_DELALLOC 0x400
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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_IGSTATE, "IGSTATE" }, \
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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_DELALLOC, "DELALLOC" }
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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(int 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 (1 << 0)
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#define BMAP_RIGHT_CONTIG (1 << 1)
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#define BMAP_LEFT_FILLING (1 << 2)
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#define BMAP_RIGHT_FILLING (1 << 3)
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#define BMAP_LEFT_DELAY (1 << 4)
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#define BMAP_RIGHT_DELAY (1 << 5)
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#define BMAP_LEFT_VALID (1 << 6)
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#define BMAP_RIGHT_VALID (1 << 7)
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#define BMAP_ATTRFORK (1 << 8)
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#define BMAP_COWFORK (1 << 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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/*
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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_real_extent(struct xfs_bmbt_irec *irec)
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{
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return irec->br_state != XFS_EXT_UNWRITTEN &&
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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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* This macro is used to determine how many extents will be shifted
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* in one write transaction. We could require two splits,
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* an extent move on the first and an extent merge on the second,
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* So it is proper that one extent is shifted inside write transaction
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* at a time.
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*/
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#define XFS_BMAP_MAX_SHIFT_EXTENTS 1
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enum shift_direction {
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SHIFT_LEFT = 0,
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SHIFT_RIGHT,
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};
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#ifdef DEBUG
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void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
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int whichfork, unsigned long caller_ip);
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
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xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_)
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#else
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#define XFS_BMAP_TRACE_EXLIST(ip,c,w)
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#endif
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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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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_inode *ip, int whichfork);
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void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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xfs_fsblock_t bno, xfs_filblks_t len,
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struct xfs_owner_info *oinfo);
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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_bmap_one_block(struct xfs_inode *ip, int whichfork);
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int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
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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, int 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, int flags,
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xfs_fsblock_t *firstblock, xfs_extlen_t total,
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struct xfs_bmbt_irec *mval, int *nmap,
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struct xfs_defer_ops *dfops);
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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, int flags,
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xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops);
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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, int flags,
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xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops, int *done);
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int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
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xfs_extnum_t *idx, 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, xfs_extnum_t *idx,
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struct xfs_bmbt_irec *got, struct xfs_bmbt_irec *del);
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uint xfs_default_attroffset(struct xfs_inode *ip);
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int xfs_bmap_shift_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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int *done, xfs_fileoff_t stop_fsb, xfs_fsblock_t *firstblock,
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struct xfs_defer_ops *dfops, enum shift_direction direction,
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int num_exts);
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int xfs_bmap_split_extent(struct xfs_inode *ip, 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, xfs_extnum_t *lastx, int eof);
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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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struct xfs_inode *bi_owner;
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int bi_whichfork;
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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_defer_ops *dfops,
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struct xfs_inode *ip, enum xfs_bmap_intent_type type,
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int whichfork, xfs_fileoff_t startoff, xfs_fsblock_t startblock,
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xfs_filblks_t *blockcount, xfs_exntst_t state);
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int xfs_bmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
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int xfs_bmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, struct xfs_bmbt_irec *imap);
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#endif /* __XFS_BMAP_H__ */
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