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quota: clean up Q_XQUOTASYNC

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Currently Q_XQUOTASYNC calls into the quota_sync method, but XFS does something
entirely different in it than the rest of the filesystems.  xfs_quota which
calls Q_XQUOTASYNC expects an asynchronous data writeout to flush delayed
allocations, while the "VFS" quota support wants to flush changes to the quota
file.

So make Q_XQUOTASYNC call into the writeback code directly and make the
quota_sync method optional as XFS doesn't need in the sense expected by the
rest of the quota code.

GFS2 was using limited XFS-style quota and has a quota_sync method fitting
neither the style used by vfs_quota_sync nor xfs_fs_quota_sync.  I left it
in for now as per discussion with Steve it expects to be called from the
sync path this way.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Christoph Hellwig 2010-02-16 03:44:51 -05:00 • committed by Jan Kara
commit 8c4e4acd66
3 changed files with 8 additions and 20 deletions
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2
include/linux/quotaops.h
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@ -22,7 +22,7 @@ static inline struct quota_info *sb_dqopt(struct super_block *sb)
void sync_quota_sb(struct super_block *sb, int type);
static inline void writeout_quota_sb(struct super_block *sb, int type)
{
if (sb->s_qcop->quota_sync)
if (sb->s_qcop && sb->s_qcop->quota_sync)
sb->s_qcop->quota_sync(sb, type);
}