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xfs: don't update rmapbt when fixing agfl 

Allow a caller of xfs_alloc_fix_freelist to disable rmapbt updates
when fixing the AG freelist.  xfs_repair needs this during phase 5
to be able to adjust the freelist while it's reconstructing the rmap
btree; the missing entries will be added back at the very end of
phase 5 once the AGFL contents settle down.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2016-08-03 12:19:53 +10:00 committed by Dave Chinner
parent 2b0eeb5e74
commit 04f130605f
2 changed files with 17 additions and 4 deletions
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18
fs/xfs/libxfs/xfs_alloc.c
View File

@ -2090,9 +2090,21 @@ xfs_alloc_fix_freelist(
* anything other than extra overhead when we need to put more blocks
* back on the free list? Maybe we should only do this when space is
* getting low or the AGFL is more than half full?
*
* The NOSHRINK flag prevents the AGFL from being shrunk if it's too
* big; the NORMAP flag prevents AGFL expand/shrink operations from
* updating the rmapbt. Both flags are used in xfs_repair while we're
* rebuilding the rmapbt, and neither are used by the kernel. They're
* both required to ensure that rmaps are correctly recorded for the
* regenerated AGFL, bnobt, and cntbt. See repair/phase5.c and
* repair/rmap.c in xfsprogs for details.
*/
xfs_rmap_ag_owner(&targs.oinfo, XFS_RMAP_OWN_AG);
while (pag->pagf_flcount > need) {
memset(&targs, 0, sizeof(targs));
if (flags & XFS_ALLOC_FLAG_NORMAP)
xfs_rmap_skip_owner_update(&targs.oinfo);
else
xfs_rmap_ag_owner(&targs.oinfo, XFS_RMAP_OWN_AG);
while (!(flags & XFS_ALLOC_FLAG_NOSHRINK) && pag->pagf_flcount > need) {
struct xfs_buf *bp;
error = xfs_alloc_get_freelist(tp, agbp, &bno, 0);
@ -2106,10 +2118,8 @@ xfs_alloc_fix_freelist(
xfs_trans_binval(tp, bp);
}
memset(&targs, 0, sizeof(targs));
targs.tp = tp;
targs.mp = mp;
xfs_rmap_ag_owner(&targs.oinfo, XFS_RMAP_OWN_AG);
targs.agbp = agbp;
targs.agno = args->agno;
targs.alignment = targs.minlen = targs.prod = targs.isfl = 1;

3
fs/xfs/libxfs/xfs_alloc.h
View File

@ -54,6 +54,9 @@ typedef unsigned int xfs_alloctype_t;
*/
#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
#define XFS_ALLOC_FLAG_NORMAP 0x00000004 /* don't modify the rmapbt */
#define XFS_ALLOC_FLAG_NOSHRINK 0x00000008 /* don't shrink the freelist */
/*
* Argument structure for xfs_alloc routines.