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authorChristoph Hellwig <hch@infradead.org>2010-02-16 03:44:51 -0500
committerJan Kara <jack@suse.cz>2010-03-05 00:20:24 +0100
commit8c4e4acd660a09e571a71583b5bbe1eee700c9ad (patch)
tree05d1208e70d96dfa6857dbb84de7f3554a721992 /fs/quota/quota.c
parentc988afb5fa3fc450207c3dfc0ce535f4bfdae4d1 (diff)
quota: clean up Q_XQUOTASYNC
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>
Diffstat (limited to 'fs/quota/quota.c')
-rw-r--r--fs/quota/quota.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index d0efe302b1c..3d31228082e 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -18,6 +18,7 @@
#include <linux/capability.h>
#include <linux/quotaops.h>
#include <linux/types.h>
+#include <linux/writeback.h>
#include <net/netlink.h>
#include <net/genetlink.h>
@@ -52,7 +53,7 @@ void sync_quota_sb(struct super_block *sb, int type)
{
int cnt;
- if (!sb->s_qcop->quota_sync)
+ if (!sb->s_qcop || !sb->s_qcop->quota_sync)
return;
sb->s_qcop->quota_sync(sb, type);
@@ -318,9 +319,11 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
case Q_XGETQUOTA:
return quota_getxquota(sb, type, id, addr);
case Q_XQUOTASYNC:
- if (!sb->s_qcop->quota_sync)
- return -ENOSYS;
- return sb->s_qcop->quota_sync(sb, type);
+ /* caller already holds s_umount */
+ if (sb->s_flags & MS_RDONLY)
+ return -EROFS;
+ writeback_inodes_sb(sb);
+ return 0;
default:
return -EINVAL;
}