summaryrefslogtreecommitdiffstats
path: root/fs/quota/quota.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/quota/quota.c')
-rw-r--r--fs/quota/quota.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 5acd0c4769af..07e08c7d05ca 100644
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -104,13 +104,9 @@ static int quota_getfmt(struct super_block *sb, int type, void __user *addr)
{
__u32 fmt;
- mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
- if (!sb_has_quota_active(sb, type)) {
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
+ if (!sb_has_quota_active(sb, type))
return -ESRCH;
- }
fmt = sb_dqopt(sb)->info[type].dqi_format->qf_fmt_id;
- mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
if (copy_to_user(addr, &fmt, sizeof(fmt)))
return -EFAULT;
return 0;
@@ -789,9 +785,14 @@ static int quotactl_cmd_write(int cmd)
}
return 1;
}
-
#endif /* CONFIG_BLOCK */
+/* Return true if quotactl command is manipulating quota on/off state */
+static bool quotactl_cmd_onoff(int cmd)
+{
+ return (cmd == Q_QUOTAON) || (cmd == Q_QUOTAOFF);
+}
+
/*
* look up a superblock on which quota ops will be performed
* - use the name of a block device to find the superblock thereon
@@ -809,7 +810,9 @@ static struct super_block *quotactl_block(const char __user *special, int cmd)
putname(tmp);
if (IS_ERR(bdev))
return ERR_CAST(bdev);
- if (quotactl_cmd_write(cmd))
+ if (quotactl_cmd_onoff(cmd))
+ sb = get_super_exclusive_thawed(bdev);
+ else if (quotactl_cmd_write(cmd))
sb = get_super_thawed(bdev);
else
sb = get_super(bdev);
@@ -872,7 +875,10 @@ SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
ret = do_quotactl(sb, type, cmds, id, addr, pathp);
- drop_super(sb);
+ if (!quotactl_cmd_onoff(cmds))
+ drop_super(sb);
+ else
+ drop_super_exclusive(sb);
out:
if (pathp && !IS_ERR(pathp))
path_put(pathp);