linux-toradex.git/fs/afs/flock.c, branch v3.6.6

fs/locks.c: prepare for BKL removal

2010-10-05T09:02:04+00:00

This prepares the removal of the big kernel lock from the
file locking code. We still use the BKL as long as fs/lockd
uses it and ceph might sleep, but we can flip the definition
to a private spinlock as soon as that's done.
All users outside of fs/lockd get converted to use
lock_flocks() instead of lock_kernel() where appropriate.

Based on an earlier patch to use a spinlock from Matthew
Wilcox, who has attempted this a few times before, the
earliest patch from over 10 years ago turned it into
a semaphore, which ended up being slower than the BKL
and was subsequently reverted.

Someone should do some serious performance testing when
this becomes a spinlock, since this has caused problems
before. Using a spinlock should be at least as good
as the BKL in theory, but who knows...

Signed-off-by: Arnd Bergmann 
Acked-by: Matthew Wilcox 
Cc: Christoph Hellwig 
Cc: Trond Myklebust 
Cc: "J. Bruce Fields" 
Cc: Andrew Morton 
Cc: Miklos Szeredi 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: John Kacur 
Cc: Sage Weil 
Cc: linux-kernel@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org

const: make file_lock_operations const

2009-09-22T14:17:25+00:00

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

AFS: Fix lock imbalance

2009-06-30T20:30:44+00:00

Don't unlock on vfs_rejected_lock path in afs_do_setlk, since the lock
is unlocked after abort_attempt label.

Signed-off-by: Jiri Slaby 
Signed-off-by: David Howells 
Signed-off-by: Linus Torvalds

AFS: clean up explicit check for mandatory locks

2007-10-09T22:32:46+00:00

The __mandatory_lock(inode) macro makes the same check, but makes the code
more readable.

Signed-off-by: Pavel Emelyanov 
Cc: David Howells 
Signed-off-by: Andrew Morton

AFS: fix file locking

2007-07-31T22:39:40+00:00

Fix file locking for AFS:

 (*) Start the lock manager thread under a mutex to avoid a race.

 (*) Made the locking non-fair: New readlocks will jump pending writelocks if
     there's a readlock currently granted on a file.  This makes the behaviour
     similar to Linux's VFS locking.

Signed-off-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

afs build fix

2007-07-19T17:04:57+00:00

Bruce and David's patches clashed.

fs/afs/flock.c: In function 'afs_do_getlk':
fs/afs/flock.c:459: error: void value not ignored as it ought to be

Cc: "J. Bruce Fields" 
Acked-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

AFS: implement file locking

2007-07-16T16:05:43+00:00

Implement file locking for AFS.

Signed-off-by: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds