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Subject[ 76/83] reiserfs: Protect reiserfs_quota_on() with write lock
Date
3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Kara <jack@suse.cz>

commit b9e06ef2e8706fe669b51f4364e3aeed58639eb2 upstream.

In reiserfs_quota_on() we do quite some work - for example unpacking
tail of a quota file. Thus we have to hold write lock until a moment
we call back into the quota code.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/reiserfs/super.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -2211,8 +2211,11 @@ static int reiserfs_quota_on(struct supe
struct reiserfs_transaction_handle th;
int opt = type == USRQUOTA ? REISERFS_USRQUOTA : REISERFS_GRPQUOTA;

- if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt)))
- return -EINVAL;
+ reiserfs_write_lock(sb);
+ if (!(REISERFS_SB(sb)->s_mount_opt & (1 << opt))) {
+ err = -EINVAL;
+ goto out;
+ }

/* Quotafile not on the same filesystem? */
if (path->dentry->d_sb != sb) {
@@ -2254,8 +2257,10 @@ static int reiserfs_quota_on(struct supe
if (err)
goto out;
}
- err = dquot_quota_on(sb, type, format_id, path);
+ reiserfs_write_unlock(sb);
+ return dquot_quota_on(sb, type, format_id, path);
out:
+ reiserfs_write_unlock(sb);
return err;
}




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