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Neil Brown 387bb17374 [PATCH] md: fix various bugs with aligned reads in RAID5 
It is possible for raid5 to be sent a bio that is too big for an underlying
device.  So if it is a READ that we pass stright down to a device, it will
fail and confuse RAID5.

So in 'chunk_aligned_read' we check that the bio fits within the parameters
for the target device and if it doesn't fit, fall back on reading through
the stripe cache and making lots of one-page requests.

Note that this is the earliest time we can check against the device because
earlier we don't have a lock on the device, so it could change underneath
us.

Also, the code for handling a retry through the cache when a read fails has
not been tested and was badly broken.  This patch fixes that code.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: "Kai" <epimetreus@fastmail.fm>
Cc: <stable@suse.de>
Cc: <org@suse.de>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2007-02-09 09:25:46 -08:00
..
Kconfig [PATCH] Centralise definitions of sector_t and blkcnt_t 2006-12-04 19:41:15 -08:00
Kconfig.iosched [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
Makefile [PATCH] BLOCK: Make it possible to disable the block layer [try #6] 2006-09-30 20:52:31 +02:00
as-iosched.c [PATCH] Allow as-iosched to be unloaded 2006-12-13 13:25:18 +01:00
blktrace.c [PATCH] Allow NULL pointers in percpu_free 2006-12-07 08:39:22 -08:00
cfq-iosched.c [PATCH] cfq-iosched: merging problem 2007-01-02 09:46:16 -08:00
deadline-iosched.c [BLOCK] Cleanup unused variable passing 2006-12-01 10:42:33 +01:00
elevator.c [PATCH] elevator: move clearing of unplug flag earlier 2007-01-23 11:01:17 -08:00
genhd.c [PATCH] fault-injection capability for disk IO 2006-12-08 08:29:02 -08:00
ioctl.c [PATCH] struct path: convert block 2006-12-08 08:28:44 -08:00
ll_rw_blk.c [PATCH] md: fix various bugs with aligned reads in RAID5 2007-02-09 09:25:46 -08:00
noop-iosched.c [BLOCK] Cleanup unused variable passing 2006-12-01 10:42:33 +01:00
scsi_ioctl.c [PATCH] Fix SG_IO timeout jiffy conversion 2007-01-29 20:32:03 -08:00