kernel.git/block/blk-core.c, branch linux-2.6.36.y

BLOCK: fix bio.bi_rw handling

2010-08-23T10:33:10Z

Return of the bi_rw tests is no longer bool after commit 74450be1. But results of such tests are stored in bools. This doesn't fit in there for some compilers (gcc 4.5 here), so either use !! magic to get real bools or use ulong where the result is assigned somewhere. Signed-off-by: Jiri Slaby Cc: Christoph Hellwig Reviewed-by: Jeff Moyer Signed-off-by: Jens Axboe

block: add secure discard

2010-08-12T15:43:30Z

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: update request stacking methods to support discards

2010-08-08T16:11:33Z

Propagate REQ_DISCARD in cmd_flags when cloning a discard request. Skip blk_rq_check_limits's existing checks for discard requests because discard limits will have already been checked in blkdev_issue_discard. Signed-off-by: Mike Snitzer Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: implement an unprep function corresponding directly to prep

2010-08-07T16:23:47Z

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

block: fixup missing conversion from BIO_RW_DISCARD to REQ_DISCARD

2010-08-07T16:23:41Z

Didn't cause a merge conflict, so fixed this one up manually post merge. Signed-off-by: Jens Axboe

block: don't allocate a payload for discard request

2010-08-07T16:23:08Z

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

2010-08-07T16:20:39Z

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

block: remove wrappers for request type/flags

2010-08-07T16:17:56Z

Remove all the trivial wrappers for the cmd_type and cmd_flags fields in struct requests. This allows much easier grepping for different request types instead of unwinding through macros. Signed-off-by: Christoph Hellwig Signed-off-by: Jens Axboe

block: add sysfs knob for turning off disk entropy contributions

2010-08-07T16:13:00Z

There are two reasons for doing this: - On SSD disks, the completion times aren't as random as they are for rotational drives. So it's questionable whether they should contribute to the random pool in the first place. - Calling add_disk_randomness() has a lot of overhead. This adds /sys/block//queue/add_random that will allow you to switch off on a per-device basis. The default setting is on, so there should be no functional changes from this patch. Signed-off-by: Jens Axboe

block: Don't count_vm_events for discard bio in submit_bio.

2010-06-24T06:14:22Z

In submit_bio, we count vm events by check READ/WRITE. But actually DISCARD_NOBARRIER also has the WRITE flag set. It looks as if in blkdev_issue_discard, we also add a page as the payload and the bio_has_data check isn't enough. So add another check for discard bio. Signed-off-by: Tao Ma Signed-off-by: Jens Axboe