On Mon 20-06-11 16:15:33, Christoph Hellwig wrote:

i_alloc_sem has always been a bit of an odd "lock".  It's the only remaining
rw_semaphore that can be released by a different thread than the one that
locked it, and it's use case in the core direct I/O code is more like a
counter given that the writers already have external serialization.

This series removes it in favour of a simpler counter scheme, thus getting
rid of the rw_semaphore non-owner APIs as requests by Thomas, while at the
same time shrinking the size of struct inode by 160 bytes on 64-bit systems.

The only nasty bit is that two filesystems (fat and ext4) have started
abusing the lock for their own purposes.  I've added a new rw_semaphore

  ext4 abuse should be gone when Ted merges my rewrite of
ext4_page_mkwrite()... Ted, what happened to that patch. Should I resend
it?

								Honza

-- 
Jan Kara [off-list ref]
SUSE Labs, CR