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authorJan Kara <jack@suse.cz>2010-02-22 21:07:17 +0100
committerJan Kara <jack@suse.cz>2010-03-05 00:20:27 +0100
commitab94c39b6fa076d4f6d2903dcc54cda35d938776 (patch)
treed90042ad0c903e6f9034017906dfddd4dca49d62 /fs/quota/dquot.c
parent8ddd69d6df4758bf0cab981481af24cc84419567 (diff)
downloadop-kernel-dev-ab94c39b6fa076d4f6d2903dcc54cda35d938776.zip
op-kernel-dev-ab94c39b6fa076d4f6d2903dcc54cda35d938776.tar.gz
quota: Properly invalidate caches even for filesystems with blocksize < pagesize
Sometimes invalidate_bdev() can fail to invalidate a part of block device cache because of dirty data. If the filesystem has blocksize smaller than page size, this can happen even for pages containing quota files and thus kernel would operate on stale data. Fix the issue by syncing the filesystem before invalidating the cache. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/quota/dquot.c')
-rw-r--r--fs/quota/dquot.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 4d2041f..10d021d 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2033,11 +2033,13 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
}
if (!(dqopt->flags & DQUOT_QUOTA_SYS_FILE)) {
- /* As we bypass the pagecache we must now flush the inode so
- * that we see all the changes from userspace... */
- write_inode_now(inode, 1);
- /* And now flush the block cache so that kernel sees the
- * changes */
+ /* As we bypass the pagecache we must now flush all the
+ * dirty data and invalidate caches so that kernel sees
+ * changes from userspace. It is not enough to just flush
+ * the quota file since if blocksize < pagesize, invalidation
+ * of the cache could fail because of other unrelated dirty
+ * data */
+ sync_filesystem(sb);
invalidate_bdev(sb->s_bdev);
}
mutex_lock(&dqopt->dqonoff_mutex);
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