linux-toradex.git/block, branch v2.6.19.3

[PATCH] elevator: move clearing of unplug flag earlier

2007-02-05T16:31:42+00:00

A flag was recently added to the elevator code to avoid
performing an unplug when reuests are being re-queued.
The goal of this flag was to avoid a deep recursion that
can occur when re-queueing requests after a SCSI device/host
reset.  See http://lkml.org/lkml/2006/5/17/254

However, that fix added the flag near the bottom of a case
statement, where an earlier break (in an if statement) could
transport one out of the case, without setting the flag.
This patch sets the flag earlier in the case statement.

I re-discovered the deep recursion recently during testing;
I was told that it was a known problem, and the fix to it was
in the kernel I was testing. Indeed it was ... but it didn't
fix the bug. With the patch below, I no longer see the bug.

Signed-off by: Linas Vepstas 
Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright

[PATCH] scsi: clear garbage after CDBs on SG_IO

2006-11-16T19:43:38+00:00

ATAPI devices transfer fixed number of bytes for CDBs (12 or 16).  Some
ATAPI devices choke when shorter CDB is used and the left bytes contain
garbage.  Block SG_IO cleared left bytes but SCSI SG_IO didn't.  This patch
makes SCSI SG_IO clear it and simplify CDB clearing in block SG_IO.

Signed-off-by: Tejun Heo 
Cc: Mathieu Fluhr 
Cc: James Bottomley 
Cc: Douglas Gilbert 
Acked-by: Jens Axboe 
Cc: 
Acked-by: Jeff Garzik 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Fix bad data direction in SG_IO

2006-11-13T17:47:00+00:00

Contrary to what the name misleads you to believe, SG_DXFER_TO_FROM_DEV
is really just a normal read seen from the device side.

This patch fixes http://lkml.org/lkml/2006/10/13/100

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] tidy "md: check bio address after mapping through partitions"

2006-11-03T20:27:55+00:00

Neil's xterms are too wide.

Cc: Neil Brown 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] CFQ: request <-> request merging rr_list fixup

2006-10-31T16:12:45+00:00

In very rare circumstances would we be pruning a merged request and at
the same time delete the implicated cfqq from the rr_list, and not readd
it when the merged request got added. This could cause io stalls until
that process issued io again.

Fix it up by putting the rr_list add handling into cfq_add_rq_rb(),
identical to how pruning is handled in cfq_del_rq_rb(). This fixes a
hang reproducible with fsx-linux.

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] md: check bio address after mapping through partitions.

2006-10-31T16:07:01+00:00

Partitions are not limited to live within a device.  So we should range
check after partition mapping.

Note that 'maxsector' was being used for two different things.  I have
split off the second usage into 'old_sector' so that maxsector can be still
be used for it's primary usage later in the function.

Cc: Jens Axboe 
Signed-off-by: Neil Brown 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] CFQ: bad locking in changed_ioprio()

2006-10-30T19:01:50+00:00

When the ioprio code recently got juggled a bit, a bug was introduced.
changed_ioprio() is no longer called with interrupts disabled, so using
plain spin_lock() on the queue_lock is a bug.

Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] CFQ: use irq safe locking in cfq_cic_link()

2006-10-30T18:21:58+00:00

If cfq_set_request() is called for a new process AND a non-fs io
request (so that __GFP_WAIT may not be set), cfq_cic_link() may
use spin_lock_irq() and spin_unlock_irq() with interrupts already
disabled.

Fix is to always use irq safe locking in cfq_cic_link()

Acked-By: Arjan van de Ven 
Acked-by: Ingo Molnar 
Signed-off-by: Jens Axboe 
Signed-off-by: Linus Torvalds

[PATCH] separate bdi congestion functions from queue congestion functions

2006-10-20T17:26:35+00:00

Separate out the concept of "queue congestion" from "backing-dev congestion".
Congestion is a backing-dev concept, not a queue concept.

The blk_* congestion functions are retained, as wrappers around the core
backing-dev congestion functions.

This proper layering is needed so that NFS can cleanly use the congestion
functions, and so that CONFIG_BLOCK=n actually links.

Cc: "Thomas Maier" 
Cc: "Jens Axboe" 
Cc: Trond Myklebust 
Cc: David Howells 
Cc: Peter Osterlund 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] export clear_queue_congested and set_queue_congested

2006-10-20T17:26:35+00:00

Export the clear_queue_congested() and set_queue_congested() functions
located in ll_rw_blk.c

The functions are renamed to blk_clear_queue_congested() and
blk_set_queue_congested().

(needed in the pktcdvd driver's bio write congestion control)

Signed-off-by: Thomas Maier 
Cc: Peter Osterlund 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds