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SubjectRe: [PATCH 1/2] vfs: Provide function to get superblock and wait for it to thaw
On Fri, Feb 10, 2012 at 11:03:00AM +0100, Jan Kara wrote:
> 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.

Eww... All it takes is
struct super_block *get_super_thawed(struct block_device *bdev)
{
while (1) {
struct super_block *s = get_super(bdev);
if (!s || s->s_frozen == SB_UNFROZEN)
return s;
up_read(&s->s_umount);
vfs_check_frozen(s, SB_FREEZE_WRITE);
put_super(s);
}
}
and there's no need of extra arguments, etc. whatsoever. Both patches
applied, with implementation of get_super_thawed() done as above.


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