tree 59920a3aab6db4997f6b7a95c753219bdc12bd64
parent 074b85175a43a23fdbde60f55feea636e0bf0f85
author Jan Kara <jack@suse.cz> 1328868180 +0100
committer Al Viro <viro@zeniv.linux.org.uk> 1329183938 -0500

vfs: Provide function to get superblock and wait for it to thaw

In quota code we need to find a superblock corresponding to a device and wait
for superblock to be unfrozen. However this waiting has to happen without
s_umount semaphore because that is required for superblock to thaw. So provide
a function in VFS for this to keep dances with s_umount where they belong.

[AV: implementation switched to saner variant]

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>