path: root/fs/ext3/super.c
diff options
authorJan Kara <jack@suse.cz>2010-09-15 17:38:58 +0200
committerJan Kara <jack@suse.cz>2011-01-12 19:14:55 +0100
commitf00c9e44ad1a9660fe8cd3ca15b6cd9497172eab (patch)
treecbb47ae0d8aba9d8b3c44714b000156715cdf969 /fs/ext3/super.c
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 (diff)
quota: Fix deadlock during path resolution
As Al Viro pointed out path resolution during Q_QUOTAON calls to quotactl is prone to deadlocks. We hold s_umount semaphore for reading during the path resolution and resolution itself may need to acquire the semaphore for writing when e. g. autofs mountpoint is passed. Solve the problem by performing the resolution before we get hold of the superblock (and thus s_umount semaphore). The whole thing is complicated by the fact that some filesystems (OCFS2) ignore the path argument. So to distinguish between filesystem which want the path and which do not we introduce new .quota_on_meta callback which does not get the path. OCFS2 then uses this callback instead of old .quota_on. CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Christoph Hellwig <hch@lst.de> CC: Ted Ts'o <tytso@mit.edu> CC: Joel Becker <joel.becker@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to '')
1 files changed, 7 insertions, 18 deletions
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index b7d0554631e4..0e0d391626be 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -755,7 +755,7 @@ static int ext3_release_dquot(struct dquot *dquot);
static int ext3_mark_dquot_dirty(struct dquot *dquot);
static int ext3_write_info(struct super_block *sb, int type);
static int ext3_quota_on(struct super_block *sb, int type, int format_id,
- char *path);
+ struct path *path);
static int ext3_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
size_t len, loff_t off);
@@ -2885,27 +2885,20 @@ static int ext3_quota_on_mount(struct super_block *sb, int type)
* Standard function to be called on quota_on
static int ext3_quota_on(struct super_block *sb, int type, int format_id,
- char *name)
+ struct path *path)
int err;
- struct path path;
if (!test_opt(sb, QUOTA))
return -EINVAL;
- err = kern_path(name, LOOKUP_FOLLOW, &path);
- if (err)
- return err;
/* Quotafile not on the same filesystem? */
- if (path.mnt->mnt_sb != sb) {
- path_put(&path);
+ if (path->mnt->mnt_sb != sb)
return -EXDEV;
- }
/* Journaling quota? */
if (EXT3_SB(sb)->s_qf_names[type]) {
/* Quotafile not of fs root? */
- if (path.dentry->d_parent != sb->s_root)
+ if (path->dentry->d_parent != sb->s_root)
ext3_msg(sb, KERN_WARNING,
"warning: Quota file not on filesystem root. "
"Journaled quota will not work.");
@@ -2915,7 +2908,7 @@ static int ext3_quota_on(struct super_block *sb, int type, int format_id,
* When we journal data on quota file, we have to flush journal to see
* all updates to the file when we bypass pagecache...
- if (ext3_should_journal_data(path.dentry->d_inode)) {
+ if (ext3_should_journal_data(path->dentry->d_inode)) {
* We don't need to lock updates but journal_flush() could
* otherwise be livelocked...
@@ -2923,15 +2916,11 @@ static int ext3_quota_on(struct super_block *sb, int type, int format_id,
err = journal_flush(EXT3_SB(sb)->s_journal);
- if (err) {
- path_put(&path);
+ if (err)
return err;
- }
- err = dquot_quota_on_path(sb, type, format_id, &path);
- path_put(&path);
- return err;
+ return dquot_quota_on(sb, type, format_id, path);
/* Read data from quotafile - avoid pagecache and such because we cannot afford