linux/drivers/s390
Arnd Bergmann 6e9624b8ca block: push down BKL into .open and .release
The open and release block_device_operations are currently
called with the BKL held. In order to change that, we must
first make sure that all drivers that currently rely
on this have no regressions.

This blindly pushes the BKL into all .open and .release
operations for all block drivers to prepare for the
next step. The drivers can subsequently replace the BKL
with their own locks or remove it completely when it can
be shown that it is not needed.

The functions blkdev_get and blkdev_put are the only
remaining users of the big kernel lock in the block
layer, besides a few uses in the ioctl code, none
of which need to serialize with blkdev_{get,put}.

Most of these two functions is also under the protection
of bdev->bd_mutex, including the actual calls to
->open and ->release, and the common code does not
access any global data structures that need the BKL.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-07 18:25:34 +02:00
..
block block: push down BKL into .open and .release 2010-08-07 18:25:34 +02:00
char block: push down BKL into .open and .release 2010-08-07 18:25:34 +02:00
cio [S390] cio: fix potential overflow in chpid descriptor 2010-07-19 09:22:50 +02:00
crypto [S390] avoid default_llseek in s390 drivers 2010-05-17 10:00:16 +02:00
kvm include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2010-05-20 21:04:44 -07:00
scsi [SCSI] zfcp: Update status read mempool 2010-07-21 15:05:09 -07:00
Makefile [S390] split/move machine check handler code 2009-03-26 15:24:10 +01:00