On Tue, 3 Jan 2012, Al Viro wrote: > On Fri, Nov 25, 2011 at 03:25:16PM -0500, Mikulas Patocka wrote: > > > The following patch fixes the deadlock. When the quota subsystem takes s_umount, > > it checks if the filesystem is frozen. If it is, we drop s_umount, wait for > > the filesystem to resume and retry. > > > > Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> > > CC: stable@xxxxxxxxxx > > So basically you want a variant of get_super() that would get you a > superblock for this bdev, locked and unfrozen? Fair enough, but > * that should be a proper helper in super.c, rather than > open-coded in fs/quota/quota.c, of all places > * what about other existing callers get_super() and its friends? Hi You can look at that functionality here: I've already made a patch that has it: https://www.redhat.com/archives/dm-devel/2011-November/msg00151.html Basically, the patch introduces a function down_read_s_umount, which takes s_umount for read, but makes sure that the filesystem is not frozen. Then, it adds a boolean parameter to get_super() which tells get_super() that it should wait for unfreeze (i.e. call "down_read_s_umount" isntead of "down_read(&sb->s_umount)"). Mikulas > and while we are at it, why in damnation name is it exported? The only > caller outside of core VFS is under #if 0... > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
