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The collapse range implementation uses a transaction per extent shift. The progress of the overall operation is tracked via the current extent index of the in-core extent list. This is racy because the ilock must be dropped and reacquired for each transaction according to locking and log reservation rules. Therefore, writeback to prior regions of the file is possible and can change the extent count. This changes the extent to which the current index refers and causes the collapse to fail mid operation. To avoid this problem, the entire file is currently written back before the collapse operation starts. To eliminate the need to flush the entire file, use the file offset (fsb) to track the progress of the overall extent shift operation rather than the extent index. Modify xfs_bmap_shift_extents() to unconditionally convert the start_fsb parameter to an extent index and return the file offset of the extent where the shift left off, if further extents exist. The bulk of ths function can remain based on extent index as ilock is held by the caller. xfs_collapse_file_space() now uses the fsb output as the starting point for the subsequent shift. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
185 lines
6.6 KiB
C
185 lines
6.6 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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* 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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typedef struct xfs_bmap_free_item
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{
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xfs_fsblock_t xbfi_startblock;/* starting fs block number */
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xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */
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struct xfs_bmap_free_item *xbfi_next; /* link to next entry */
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} xfs_bmap_free_item_t;
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/*
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* Header for free extent list.
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*
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* xbf_low is used by the allocator to activate the lowspace algorithm -
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* when free space is running low the extent allocator may choose to
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* allocate an extent from an AG without leaving sufficient space for
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* a btree split when inserting the new extent. In this case the allocator
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* will enable the lowspace algorithm which is supposed to allow further
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* allocations (such as btree splits and newroots) to allocate from
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* sequential AGs. In order to avoid locking AGs out of order the lowspace
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* algorithm will start searching for free space from AG 0. If the correct
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* transaction reservations have been made then this algorithm will eventually
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* find all the space it needs.
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*/
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typedef struct xfs_bmap_free
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{
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xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */
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int xbf_count; /* count of items on list */
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int xbf_low; /* alloc in low mode */
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} xfs_bmap_free_t;
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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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#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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static inline int xfs_bmapi_aflag(int w)
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{
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return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
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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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static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
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{
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((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
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(flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK);
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}
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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 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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/*
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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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#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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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(xfs_fsblock_t bno, xfs_filblks_t len,
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struct xfs_bmap_free *flist, struct xfs_mount *mp);
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void xfs_bmap_cancel(struct xfs_bmap_free *flist);
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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_delay(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_bmap_free *flist);
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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_bmap_free *flist, int *done);
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int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
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xfs_extnum_t num);
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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 start_fsb, xfs_fileoff_t offset_shift_fsb,
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int *done, xfs_fileoff_t *next_fsb, xfs_fsblock_t *firstblock,
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struct xfs_bmap_free *flist, int num_exts);
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#endif /* __XFS_BMAP_H__ */
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