diff options
| author | Jan Kara <jack@suse.cz> | 2012-11-13 16:34:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 11:38:02 -0800 |
| commit | 8ed4d1ceb26e7f1011314a4f2db93897fb8949e2 (patch) | |
| tree | c1f7c66bd0196d88284dfb86a0fd0a83618c5ab5 /fs | |
| parent | 394cbbc4417c009f2831122e9d64c975c8249123 (diff) | |
reiserfs: Protect reiserfs_quota_on() with write lock
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/reiserfs/super.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index f4f83bfc571..107f7bd75e9 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -2170,8 +2170,11 @@ 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) { @@ -2213,8 +2216,10 @@ 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; } |