linux/drivers/block, branch v2.6.13

[PATCH] cfq-iosched.c: minor fixes

2005-08-24T17:22:44Z

One critical fix and two minor fixes for 2.6.13-rc7: - Max depth must currently be 2 to allow barriers to function on SCSI - Prefer sync request over async in choosing the next request - Never allow async request to preempt or disturb the "anticipation" for a single cfq process context. This is as-designed, the code right now is buggy in that area. Signed-off-by: Jens Axboe Signed-off-by: Linus Torvalds

[PATCH] blk: fix tag shrinking (revive real_max_size)

2005-08-05T20:43:16Z

My patch in commit fa72b903f75e4f0f0b2c2feed093005167da4023 incorrectly removed blk_queue_tag->real_max_depth. The original resize implementation was incorrect in the following points. * actual allocation size of tag_index was shorter than real_max_size, but assumed to be of the same size, possibly causing memory access beyond the allocated area. * bits in tag_map between max_deptn and real_max_depth were initialized to 1's, making the tags permanently reserved. In an attempt to fix above two bugs, I had removed allocation optimization in init_tag_map and real_max_size. Tag map/index were allocated and freed immediately during resize. Unfortunately, I wasn't considering that tag map/index can be resized dynamically with tags beyond new_depth active. This led to accessing freed area after shrinking tags and led to the following bug reporting thread on linux-scsi. http://marc.theaimsgroup.com/?l=linux-scsi&m=112319898111885&w=2 To fix the problem, I've revived real_max_depth without allocation optimization in init_tag_map, and Andrew Vasquez confirmed that the problem was fixed. As Jens is not going to be available for a week, he asked me to make sure that this patch reaches you. http://marc.theaimsgroup.com/?l=linux-scsi&m=112325778530886&w=2 Also, a comment was added to make sure that real_max_size is needed for dynamic shrinking. Signed-off-by: Tejun Heo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] cfq-iosched: fix problem with barriers and max_depth == 1

2005-08-02T18:19:18Z

CFQ will currently stall when using write barriers and the default max_depth setting of 1, since we artificially need a depth of 2 when pre-pending the first flush. So never deny the barrier request going to the device. This is a regression since 2.6.12, it was found in SUSE testing. Signed-off-by: Jens Axboe Signed-off-by: Linus Torvalds

[PATCH] cciss per disk queue

2005-07-28T15:39:01Z

This patch adds per disk queue functionality to cciss. Sometime back I submitted a patch but it looks like only part of what I needed. In the 2.6 kernel if we have more than one logical volume the driver will Oops during rmmod. It seems all of the queues actually point back to the same queue. So after deleting the first volume you hit a null pointer on the second one. This has been tested in our labs. There is no difference in performance, it just fixes the Oops. Signed-off-by: Mike Miller Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] turn many #if $undefined_string into #ifdef $undefined_string

2005-07-27T23:26:08Z

turn many #if $undefined_string into #ifdef $undefined_string to fix some warnings after -Wno-def was added to global CFLAGS Signed-off-by: Olaf Hering Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] ub: fix for blank CDs

2005-07-27T23:25:52Z

This patch fixes a microcode lockup in my CD-ROM adapters when a blank CD is inserted. However, do not try to burn CDs yet! I'm pretty sure that trying it will end in coasters. - Fix a few cases where we were unable to resynchronize with replies for previous commands. The main thing is to keep reading replies in case of a stall. This is done with the new state CLRRS. - Since I am forgetting the basic state machine already, document it. - Move counter increments in the looping path in its own function. - Fix a harmless buglet in case CSW read fails to submit: do not override state. - Implement the Alan Stern's idea for adaptive signature checking. Signed-off-by: Pete Zaitcev Cc: Greg KH Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] as-iosched tunable encoding fix

2005-07-27T23:25:50Z

AS is doing internal msec<->jiffies conversions twice, so the sysfs tunables which represent time are coming out wrong. The switch from HZ=1000 exposed this. Cc: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Fix get_request nastiness

2005-06-29T15:46:30Z

get_request is now expected to be holding on to queue_lock, with interrupts disabled, when it returns NULL; but one path forgot that, causing all kinds of nastiness under swap load - badness backtraces, strange failures, BUGs. Signed-off-by: Hugh Dickins Signed-off-by: Linus Torvalds

[PATCH] blk: light iocontext ops

2005-06-29T04:20:35Z

get_io_context needlessly turned off interrupts and checked for racing io context creations. Both of which aren't needed, because the io context can only be created while in process context of the current process. Also, split the function in 2. A light version, current_io_context does not elevate the reference count specifically, but can be used when in process context, because the process holds a reference itself. Signed-off-by: Nick Piggin Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] blk: reduce locking

2005-06-29T04:20:34Z

Change around locking a bit for a result of 1-2 less spin lock unlock pairs in request submission paths. Signed-off-by: Nick Piggin Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds