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[XFS] Fix block reservation mechanism.

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The block reservation mechanism has been broken since the per-cpu
superblock counters were introduced. Make the block reservation code work
with the per-cpu counters by syncing the counters, snapshotting the amount
of available space and then doing a modifcation of the counter state
according to the result. Continue in a loop until we either have no space
available or we reserve some space.

SGI-PV: 956323
SGI-Modid: xfs-linux-melb:xfs-kern:27895a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>
This commit is contained in:
David Chinner
2007-02-10 18:36:17 +11:00
committed by Tim Shimmin
parent 20f4ebf2bf
commit dbcabad19a
4 changed files with 54 additions and 20 deletions
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2
fs/xfs/xfs_vfsops.c
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@ -806,7 +806,7 @@ xfs_statvfs(
statp->f_type = XFS_SB_MAGIC;
xfs_icsb_sync_counters_lazy(mp);
xfs_icsb_sync_counters_flags(mp, XFS_ICSB_LAZY_COUNT);
s = XFS_SB_LOCK(mp);
statp->f_bsize = sbp->sb_blocksize;
lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0;