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 <[email protected]>
Cc: "Kai" <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2007-02-09 09:25:46 -08:00

..

as-iosched.c

[PATCH] Allow as-iosched to be unloaded

2006-12-13 13:25:18 +01:00

blktrace.c

…

cfq-iosched.c

[PATCH] cfq-iosched: merging problem

2007-01-02 09:46:16 -08:00

deadline-iosched.c

…

elevator.c

[PATCH] elevator: move clearing of unplug flag earlier

2007-01-23 11:01:17 -08:00

genhd.c

…

ioctl.c

…

Kconfig

…

Kconfig.iosched

…

ll_rw_blk.c

[PATCH] md: fix various bugs with aligned reads in RAID5

2007-02-09 09:25:46 -08:00

Makefile

…

noop-iosched.c

…

scsi_ioctl.c

[PATCH] Fix SG_IO timeout jiffy conversion

2007-01-29 20:32:03 -08:00