Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

[mirror_ubuntu-artful-kernel.git] / fs / quota / quota.c

diff --git a/fs/quota/quota.c b/fs/quota/quota.c
index 7a9bedeb1d571e1cd713f5c6fcb26547c9f46813..9a391204ca278e4186300215ef521183af70eb68 100644 (file)
--- a/fs/quota/quota.c
+++ b/fs/quota/quota.c
@@ -291,11 +291,26 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id,
        }
 }
 
+/* Return 1 if 'cmd' will block on frozen filesystem */
+static int quotactl_cmd_write(int cmd)
+{
+       switch (cmd) {
+       case Q_GETFMT:
+       case Q_GETINFO:
+       case Q_SYNC:
+       case Q_XGETQSTAT:
+       case Q_XGETQUOTA:
+       case Q_XQUOTASYNC:
+               return 0;
+       }
+       return 1;
+}
+
 /*
  * look up a superblock on which quota ops will be performed
  * - use the name of a block device to find the superblock thereon
  */
-static struct super_block *quotactl_block(const char __user *special)
+static struct super_block *quotactl_block(const char __user *special, int cmd)
 {
 #ifdef CONFIG_BLOCK
        struct block_device *bdev;
@@ -308,7 +323,10 @@ static struct super_block *quotactl_block(const char __user *special)
        putname(tmp);
        if (IS_ERR(bdev))
                return ERR_CAST(bdev);
-       sb = get_super(bdev);
+       if (quotactl_cmd_write(cmd))
+               sb = get_super_thawed(bdev);
+       else
+               sb = get_super(bdev);
        bdput(bdev);
        if (!sb)
                return ERR_PTR(-ENODEV);
@@ -360,7 +378,7 @@ SYSCALL_DEFINE4(quotactl, unsigned int, cmd, const char __user *, special,
                        pathp = &path;
        }
 
-       sb = quotactl_block(special);
+       sb = quotactl_block(special, cmds);
        if (IS_ERR(sb)) {
                ret = PTR_ERR(sb);
                goto out;