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From: Tejun Heo <htejun@gmail.com>
To: Jens Axboe <axboe@suse.de>
Cc: Reuben Farrelly <reuben-lkml@reub.net>, Ric Wheeler <ric@emc.com>,
	Andrew Morton <akpm@osdl.org>,
	neilb@suse.de, mingo@elte.hu, linux-kernel@vger.kernel.org,
	Jeff Garzik <jgarzik@pobox.com>
Subject: Re: 2.6.15-mm2
Date: Thu, 12 Jan 2006 23:20:25 +0900	[thread overview]
Message-ID: <43C665A9.60301@gmail.com> (raw)
In-Reply-To: <20060112141015.GL3945@suse.de>

Jens Axboe wrote:
> On Thu, Jan 12 2006, Tejun Heo wrote:
> 
>>4. a REQ_SPECIAL | REQ_BLOCK_PC | REQ_QUIET request gets queued at
>>   the head of the queue.  (I have no idea where this comes from.  sd
>>   driver doesn't even handle PC requests.  It will be just failed.
>>   Some kind of hardware management stuff trying to probe MMC
>>   devices?)
> 
> 
> But it does, sd understands these just fine (see references to
> blk_pc_request()).
> 
> It could be coming from someone doing a blkdev_issue_flush, that will
> even cause sd to queue such a request internally. So it isn't
> necessarily from user space (it would have to be through SG_IO at that
> point), and Reubens boot log doesn't have any evidence of anything of
> that nature being started. So I'm guessing it's the flush, raid1
> propagates these flushes to the bottom devices when it sees one.
> 
> Your analysis looks correct though, Reuben looking forward to hearing
> whether this fixes your boot hang!
> 

Ah... you're right.  I was only staring at the !blk_fs_request() test in 
sd_init_command().  It has early exit for blk_pc_request() of course. 
It needs to handle SG_IO's & flushes.  :-p

-- 
tejun

  reply	other threads:[~2006-01-12 14:20 UTC|newest]

Thread overview: 133+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-07 13:22 2.6.15-mm2 Andrew Morton
2006-01-07 13:23 ` 2.6.15-mm2 Andrew Morton
2006-01-07 15:05 ` 2.6.15-mm2 Reuben Farrelly
2006-01-07 21:31   ` 2.6.15-mm2 Andrew Morton
2006-01-07 22:06     ` 2.6.15-mm2 Reuben Farrelly
2006-01-07 23:15       ` 2.6.15-mm2 Reuben Farrelly
2006-01-07 23:40         ` 2.6.15-mm2 Andrew Morton
2006-01-10 10:15     ` 2.6.15-mm2 Reuben Farrelly
2006-01-10 10:30       ` 2.6.15-mm2 Andrew Morton
2006-01-10 10:58         ` 2.6.15-mm2 Reuben Farrelly
2006-01-10 10:47       ` 2.6.15-mm2 Ingo Molnar
2006-01-10 10:52         ` 2.6.15-mm2 Ingo Molnar
2006-01-10 10:58           ` 2.6.15-mm2 Ingo Molnar
2006-01-10 11:34           ` 2.6.15-mm2 Ingo Molnar
2006-01-10 12:28         ` 2.6.15-mm2 Reuben Farrelly
2006-01-10 12:42           ` 2.6.15-mm2 Andrew Morton
2006-01-10 13:16             ` 2.6.15-mm2 Ingo Molnar
2006-01-11  4:16               ` 2.6.15-mm2 Neil Brown
2006-01-11  5:15                 ` 2.6.15-mm2 Reuben Farrelly
2006-01-11  5:30                   ` 2.6.15-mm2 Andrew Morton
2006-01-11  5:30                     ` 2.6.15-mm2 Andrew Morton
2006-01-11 10:49                       ` 2.6.15-mm2 Reuben Farrelly
2006-01-11 11:05                         ` 2.6.15-mm2 Andrew Morton
2006-01-11 11:13                           ` 2.6.15-mm2 Jens Axboe
2006-01-11 11:40                             ` 2.6.15-mm2 Reuben Farrelly
2006-01-11 11:56                               ` 2.6.15-mm2 Jens Axboe
2006-01-11 14:39                                 ` 2.6.15-mm2 Reuben Farrelly
2006-01-11 14:52                                   ` 2.6.15-mm2 Jens Axboe
2006-01-11 14:55                                     ` 2.6.15-mm2 Jens Axboe
2006-01-11 19:23                                       ` 2.6.15-mm2 Reuben Farrelly
2006-01-11 19:45                                         ` 2.6.15-mm2 Jens Axboe
2006-01-11 19:53                                           ` 2.6.15-mm2 Jens Axboe
2006-01-12  3:49                                             ` 2.6.15-mm2 Reuben Farrelly
2006-01-12  8:00                                               ` 2.6.15-mm2 Tejun Heo
2006-01-12  8:22                                                 ` 2.6.15-mm2 Jens Axboe
     [not found]                                                 ` <43C61598.7050004@reub.net>
2006-01-12 11:18                                                   ` 2.6.15-mm2 Tejun Heo
2006-01-12 12:05                                                     ` 2.6.15-mm2 Reuben Farrelly
2006-01-12 12:31                                                       ` 2.6.15-mm2 Ric Wheeler
2006-01-12 12:39                                                         ` 2.6.15-mm2 Reuben Farrelly
2006-01-12 13:55                                                           ` 2.6.15-mm2 Tejun Heo
2006-01-12 14:10                                                             ` 2.6.15-mm2 Jens Axboe
2006-01-12 14:20                                                               ` Tejun Heo [this message]
2006-01-12 19:26                                                             ` 2.6.15-mm2 Reuben Farrelly
2006-01-12 20:32                                                               ` 2.6.15-mm2 Andrew Morton
2006-01-12 20:51                                                                 ` 2.6.15-mm2 Jeff Garzik
2006-01-13  4:49                                                                   ` 2.6.15-mm2 Reuben Farrelly
2006-01-11 21:44                                 ` 2.6.15-mm2 Neil Brown
2006-01-12  7:35                                   ` 2.6.15-mm2 Jens Axboe
2006-01-07 15:08 ` 2.6.15-mm2 Jesper Juhl
2006-01-09 17:47   ` 2.6.15-mm2 Jesper Juhl
2006-01-09 17:57     ` 2.6.15-mm2 Dave Jones
2006-01-09 18:01       ` 2.6.15-mm2 Jesper Juhl
2006-01-09 18:24         ` 2.6.15-mm2 Hugh Dickins
2006-01-09 18:48           ` 2.6.15-mm2 Jesper Juhl
2006-01-09 19:16             ` 2.6.15-mm2 Hugh Dickins
2006-01-09 19:21               ` 2.6.15-mm2 Hugh Dickins
2006-01-09 19:39               ` 2.6.15-mm2 Jesper Juhl
2006-01-09 20:15                 ` 2.6.15-mm Hugh Dickins
2006-01-09 20:30                   ` 2.6.15-mm Jesper Juhl
2006-01-09 20:41                     ` 2.6.15-mm Hugh Dickins
2006-01-09 20:46                       ` [PATCH] fix Jesper's sg_page_free Bad page states Hugh Dickins
2006-01-09 20:44                   ` 2.6.15-mm Mike Christie
2006-01-09 21:04                     ` 2.6.15-mm Hugh Dickins
2006-01-07 16:20 ` 2.6.15-mm2: why is __get_page_state() global again? Adrian Bunk
2006-01-07 18:00 ` [-mm patch] drivers/block/amiflop.c: fix compilation Adrian Bunk
2006-01-07 18:19 ` [-mm patch] drivers/acpi/: make two functions static Adrian Bunk
2006-01-07 18:21 ` [-mm patch] kernel/synchro-test.c: make 5 " Adrian Bunk
2006-01-07 19:31 ` 2.6.15-mm2 Brice Goglin
2006-01-07 21:04   ` 2.6.15-mm2 Dave Jones
2006-01-07 21:26     ` 2.6.15-mm2 Brice Goglin
2006-01-07 21:29       ` 2.6.15-mm2 David S. Miller
2006-01-07 21:41       ` 2.6.15-mm2 Arjan van de Ven
2006-01-07 21:42       ` 2.6.15-mm2 Dave Jones
2006-01-07 21:50         ` 2.6.15-mm2 Brice Goglin
2006-01-07 22:13           ` 2.6.15-mm2 Dave Jones
2006-01-07 22:26             ` 2.6.15-mm2 Brice Goglin
2006-01-11 18:41       ` 2.6.15-mm2 Brice Goglin
2006-01-11 20:29         ` 2.6.15-mm2 Dave Jones
2006-01-11 21:50           ` 2.6.15-mm2 Dave Airlie
2006-01-11 21:56             ` 2.6.15-mm2 Dave Jones
2006-01-11 23:50               ` 2.6.15-mm2 Dave Airlie
2006-01-12 10:58           ` 2.6.15-mm2 Ulrich Mueller
2006-01-12 17:11             ` 2.6.15-mm2 Dave Jones
2006-01-12 18:11               ` 2.6.15-mm2 Ulrich Mueller
2006-01-12 20:37                 ` 2.6.15-mm2 Dave Airlie
2006-01-12 21:03                   ` 2.6.15-mm2 Alan Hourihane
2006-01-12 22:02                     ` 2.6.15-mm2 Dave Airlie
2006-01-13  8:32                       ` 2.6.15-mm2 Alan Hourihane
2006-01-13 16:49                         ` 2.6.15-mm2 Dave Jones
2006-01-12 19:12               ` 2.6.15-mm2 Brice Goglin
2006-01-12 19:21                 ` 2.6.15-mm2 Dave Jones
2006-01-07 22:58   ` 2.6.15-mm2 Andrew Morton
2006-01-07 23:38     ` 2.6.15-mm2 Brice Goglin
2006-01-08 12:24       ` 2.6.15-mm2 Andrew Morton
2006-01-08 14:39         ` 2.6.15-mm2 Brice Goglin
2006-01-08 18:56           ` 2.6.15-mm2 Andrew Morton
2006-01-08 12:28       ` 2.6.15-mm2 Andrew Morton
2006-01-08 14:14         ` 2.6.15-mm2 Brice Goglin
2006-01-07 20:51 ` Badness in __mutex_unlock_slowpath Andrew James Wade
2006-01-07 21:13   ` Arjan van de Ven
2006-01-08  8:53     ` Ingo Molnar
2006-01-07 21:06 ` 2.6.15-mm2: alpha broken Alexey Dobriyan
2006-01-07 23:48   ` Andrew Morton
2006-01-08  0:45     ` [PATCH -mm] fixup *at syscalls additions (alpha, sparc64) Alexey Dobriyan
2006-01-08  0:54     ` [PATCH -mm] Fixup arch/alpha/mm/init.c compilation Alexey Dobriyan
2006-01-08 12:31     ` 2.6.15-mm2: alpha broken Alexey Dobriyan
2006-01-11  2:24     ` Paul Jackson
2006-01-13 14:11       ` Adrian Bunk
2006-01-13 15:52         ` Paul Jackson
2006-01-13 16:37         ` Al Viro
2006-01-13 18:10         ` Paul Jackson
2006-01-13 18:19           ` Randy.Dunlap
2006-01-13 19:05             ` Thomas Gleixner
2006-01-13 21:08             ` Adrian Bunk
2006-01-13 21:12               ` Randy.Dunlap
2006-01-13 21:32                 ` Adrian Bunk
2006-01-13 21:52                   ` Paul Jackson
2006-01-13 22:18                     ` Andrew Morton
2006-01-13 19:26           ` Andrew Morton
2006-01-13 21:05           ` Adrian Bunk
2006-01-08  0:40 ` 2.6.15-mm2 Alexander Gran
     [not found] ` <200601080139.34774@zodiac.zodiac.dnsalias.org>
     [not found]   ` <20060107175056.3d7a2895.akpm@osdl.org>
2006-01-10  0:30     ` 2.6.15-mm2 Alexander Gran
2006-01-10  1:22       ` 2.6.15-mm2 Andrew Morton
2006-01-10 21:20 ` 2.6.15-mm2 Serge E. Hallyn
2006-01-07 21:51 2.6.15-mm2 Chuck Ebbert
2006-01-07 22:01 2.6.15-mm2 Chuck Ebbert
2006-01-08  8:16 2.6.15-mm2 Brown, Len
2006-01-08 14:23 ` 2.6.15-mm2 Brice Goglin
2006-01-08  8:19 2.6.15-mm2 Brown, Len
2006-01-08  9:40 ` 2.6.15-mm2 Reuben Farrelly
2006-01-08 17:58 2.6.15-mm2 Brown, Len
2006-01-08 18:08 2.6.15-mm2 Brown, Len
2006-01-08 18:18 2.6.15-mm2 Brown, Len

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