linux-toradex.git/include/linux/blkdev.h, branch tegra-10.11.4

block: Deprecate QUEUE_FLAG_CLUSTER and use queue_limits instead

2011-01-07T21:58:51+00:00

commit e692cb668fdd5a712c6ed2a2d6f2a36ee83997b4 upstream.

When stacking devices, a request_queue is not always available. This
forced us to have a no_cluster flag in the queue_limits that could be
used as a carrier until the request_queue had been set up for a
metadevice.

There were several problems with that approach. First of all it was up
to the stacking device to remember to set queue flag after stacking had
completed. Also, the queue flag and the queue limits had to be kept in
sync at all times. We got that wrong, which could lead to us issuing
commands that went beyond the max scatterlist limit set by the driver.

The proper fix is to avoid having two flags for tracking the same thing.
We deprecate QUEUE_FLAG_CLUSTER and use the queue limit directly in the
block layer merging functions. The queue_limit 'no_cluster' is turned
into 'cluster' to avoid double negatives and to ease stacking.
Clustering defaults to being enabled as before. The queue flag logic is
removed from the stacking function, and explicitly setting the cluster
flag is no longer necessary in DM and MD.

Reported-by: Ed Lin 
Signed-off-by: Martin K. Petersen 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe 
Signed-off-by: Greg Kroah-Hartman

block: Ensure physical block size is unsigned int

2010-12-09T21:31:54+00:00

commit 892b6f90db81cccb723d5d92f4fddc2d68b206e1 upstream.

Physical block size was declared unsigned int to accomodate the maximum
size reported by READ CAPACITY(16).  Make sure we use the right type in
the related functions.

Signed-off-by: Martin K. Petersen 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe 
Signed-off-by: Greg Kroah-Hartman

block: add secure discard

2010-08-12T15:43:30+00:00

Secure discard is the same as discard except that all copies of the
discarded sectors (perhaps created by garbage collection) must also be
erased.

Signed-off-by: Adrian Hunter 
Acked-by: Jens Axboe 
Cc: Kyungmin Park 
Cc: Madhusudhan Chikkature 
Cc: Christoph Hellwig 
Cc: Ben Gardiner 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

block: disallow FS recursion from sb_issue_discard allocation

2010-08-07T16:53:04+00:00

Filesystems can call sb_issue_discard on a memory reclaim path
(e.g. ext4 calls sb_issue_discard during journal commit).

Use GFP_NOFS in sb_issue_discard to avoid recursing back into the FS.

Reported-by: Mikulas Patocka 
Signed-off-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: push down BKL into .locked_ioctl

2010-08-07T16:25:00+00:00

As a preparation for the removal of the big kernel
lock in the block layer, this removes the BKL
from the common ioctl handling code, moving it
into every single driver still using it.

Signed-off-by: Arnd Bergmann 
Acked-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: remove unused REQ_TYPE_LINUX_BLOCK

2010-08-07T16:24:21+00:00

Nobody uses REQ_TYPE_LINUX_BLOCK (and its REQ_LB_OP_*).

Signed-off-by: FUJITA Tomonori 
Acked-by: Jeff Garzik 
Signed-off-by: Jens Axboe

block: remove q->prepare_flush_fn completely

2010-08-07T16:24:15+00:00

This removes q->prepare_flush_fn completely (changes the
blk_queue_ordered API).

Signed-off-by: FUJITA Tomonori 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Jens Axboe

block: implement an unprep function corresponding directly to prep

2010-08-07T16:23:47+00:00

Reviewed-by: FUJITA Tomonori 

Signed-off-by: Jens Axboe

block: don't allocate a payload for discard request

2010-08-07T16:23:08+00:00

Allocating a fixed payload for discard requests always was a horrible hack,
and it's not coming to byte us when adding support for discard in DM/MD.

So change the code to leave the allocation of a payload to the lowlevel
driver.  Unfortunately that means we'll need another hack, which allows
us to update the various block layer length fields indicating that we
have a payload.  Instead of hiding this in sd.c, which we already partially
do for UNMAP support add a documented helper in the core block layer for it.

Signed-off-by: Christoph Hellwig 
Acked-by: Mike Snitzer 
Signed-off-by: Jens Axboe

block: unify flags for struct bio and struct request

2010-08-07T16:20:39+00:00

Remove the current bio flags and reuse the request flags for the bio, too.
This allows to more easily trace the type of I/O from the filesystem
down to the block driver.  There were two flags in the bio that were
missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
renamed two request flags that had a superflous RW in them.

Note that the flags are in bio.h despite having the REQ_ name - as
blkdev.h includes bio.h that is the only way to go for now.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Jens Axboe