| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 118/241] reiserfs: Protect reiserfs_quota_on() with write lock | Date | Thu, 13 Dec 2012 11:58:03 -0200 |
| |
3.5.7.2 -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: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- fs/reiserfs/super.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index 2ad0789..9b1745f 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -2206,8 +2206,11 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 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) { @@ -2249,8 +2252,10 @@ static int reiserfs_quota_on(struct super_block *sb, int type, int format_id, 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; } -- 1.7.9.5
|