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reiserfs: Protect reiserfs_quota_on() with write lock 

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.

CC: stable@vger.kernel.org # >= 3.0
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2012-11-13 16:34:17 +01:00
parent 3bb3e1fc47
commit b9e06ef2e8
1 changed files with 8 additions and 3 deletions
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11
fs/reiserfs/super.c
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@ -2216,8 +2216,11 @@ 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) {
@ -2259,8 +2262,10 @@ 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;
}