BMC/Intel-BMC/linux.git/block, branch v2.6.26-rc5

cfq-iosched: fix RCU problem in cfq_cic_lookup()

2008-05-28T12:49:28+00:00

cfq_cic_lookup() needs to properly protect ioc->ioc_data before dereferencing it and also exclude updaters of ioc->ioc_data as well. Also add a number of comments documenting why the existing RCU usage is OK. Thanks a lot to "Paul E. McKenney" for review and comments! Signed-off-by: Jens Axboe

block: make blktrace use per-cpu buffers for message notes

2008-05-28T12:49:27+00:00

Currently it uses a single static char array, but that risks being corrupted when multiple users issue message notes at the same time. Make the buffers dynamically allocated when the trace is setup and make them per-cpu instead. The default max message size of 1k is also very large, the interface is mainly for small text notes. So shrink it to 128 bytes. Signed-off-by: Jens Axboe

Added in elevator switch message to blktrace stream

2008-05-28T12:49:27+00:00

Signed-off-by: Alan D. Brunelle Signed-off-by: Jens Axboe

Added in MESSAGE notes for blktraces

2008-05-28T12:49:27+00:00

Allows messages to be inserted into blktrace streams. Signed-off-by: Alan D. Brunelle Signed-off-by: Jens Axboe

block: reorder cfq_queue to save space on 64bit builds

2008-05-28T12:49:27+00:00

saves 8 bytes of padding & increases objects/slab from 30 to 32 on my AMD64 config Signed-off-by: Richard Kennedy Signed-off-by: Jens Axboe

block: Move the second call to get_request to the end of the loop

2008-05-28T12:49:27+00:00

In function get_request_wait, the second call to get_request could be moved to the end of the while loop, because if the first call to get_request fails, the second call will fail without sleep. Signed-off-by: Zhang Yanmin Signed-off-by: Jens Axboe

Remove blkdev warning triggered by using md

2008-05-15T02:11:15+00:00

As setting and clearing queue flags now requires that we hold a spinlock on the queue, and as blk_queue_stack_limits is called without that lock, get the lock inside blk_queue_stack_limits. For blk_queue_stack_limits to be able to find the right lock, each md personality needs to set q->queue_lock to point to the appropriate lock. Those personalities which didn't previously use a spin_lock, us q->__queue_lock. So always initialise that lock when allocated. With this in place, setting/clearing of the QUEUE_FLAG_PLUGGED bit will no longer cause warnings as it will be clear that the proper lock is held. Thanks to Dan Williams for review and fixing the silly bugs. Signed-off-by: NeilBrown Cc: Dan Williams Cc: Jens Axboe Cc: Alistair John Strachan Cc: Nick Piggin Cc: "Rafael J. Wysocki" Cc: Jacek Luczak Cc: Prakash Punnoor Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

block: do_mounts - accept root=

2008-05-14T17:37:57+00:00

Some devices, like md, may create partitions only at first access, so allow root= to be set to a valid non-existant partition of an existing disk. This applies only to non-initramfs root mounting. This fixes a regression from 2.6.24 which did allow this to happen and broke some users machines :( Acked-by: Neil Brown Tested-by: Joao Luis Meloni Assirati Cc: stable Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman

Fix misuses of bdevname()

2008-05-13T15:02:26+00:00

bdevname() fills the buffer that it is given as a parameter, so calling strcpy() or snprintf() on the returned value is redundant (and probably not guaranteed to work - I don't think strcpy and snprintf support overlapping buffers.) Signed-off-by: Jean Delvare Cc: Stephen Tweedie Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

block: avoid duplicate calls to get_part() in disk stat code

2008-05-07T08:15:46+00:00

get_part() is fairly expensive, as it O(N) loops over partitions to find the right one. In lots of normal IO paths we end up looking up the partition twice, to make matters even worse. Change the stat add code to accept a passed in partition instead. Signed-off-by: Jens Axboe