On Sat, Jun 02, 2012 at 12:30:14AM +0200, Jan Kara wrote:

  Hello,

  here is the sixth iteration of my patches to improve filesystem freezing.
The change since last iteration is that filesystem can be frozen with open but
unlinked files. After some thinking, I've decided that the best way to handle
this is to block removal inside ->evict_inode() of each filesystem and use
fs-internal level of freeze protection for that (usually I've instrumented
filesystem's transaction system to use freeze protection). Handling
inside VFS would be less work but the only level of freeze protection that
has a chance of not causing deadlocks is the one used for page faults and even
there it's not clear lock ordering would be correct wrt some fs-specific locks.
I've converted ext2, ext4, btrfs, xfs, nilfs2, ocfs2, gfs2 and also checked
that ext3, reiserfs, jfs should work as well (they have their internal freeze
protection mechanisms, possibly they could be replaced by a generic one but
given these are mostly aging filesystems, it's not a real priority IHMO).
So finally I'm not aware of any pending issue with this patch set so if you
have some concern, please speak up!

Could you rebase on top of e.g. -rc2 and repost?
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