linux-ext4 - Re: [PATCH updated] ext4: Fix file fragmentation during large file write.

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Date:	Wed, 15 Oct 2008 20:44:07 -0600
From:	Andreas Dilger <adilger@....com>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com,
	akpm@...ux-foundation.org, hch@...radead.org, steve@...gwyn.com,
	npiggin@...e.de, mpatocka@...hat.com, linux-mm@...ck.org,
	inux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH updated] ext4: Fix file fragmentation during large file
	write.

On Oct 15, 2008  19:51 -0400, Chris Mason wrote:
> Just FYI, I ran this with compilebench -i 20 --makej and my log is full
> of these:
> 
> ext4_da_writepages: jbd2_start: 1024 pages, ino 520417; err -30
> Pid: 4072, comm: pdflush Not tainted 2.6.27 #2

-30 is -EROFS...  Was the filesystem remounted read-only because of
an error?

> Call Trace:
>  [<ffffffffa0048493>] ext4_da_writepages+0x171/0x2d3 [ext4]
>  [<ffffffff802336be>] ? pick_next_task_fair+0x80/0x91
>  [<ffffffff80228fa8>] ? source_load+0x2a/0x58
>  [<ffffffff8038e499>] ? __next_cpu+0x19/0x26
>  [<ffffffff8026748f>] do_writepages+0x28/0x37
>  [<ffffffff802a6b39>] __writeback_single_inode+0x14f/0x26d
>  [<ffffffff802a6fb7>] generic_sync_sb_inodes+0x1c1/0x2a2
>  [<ffffffff802a70a1>] sync_sb_inodes+0x9/0xb
>  [<ffffffff802a73dc>] writeback_inodes+0x64/0xad
>  [<ffffffff802675db>] wb_kupdate+0x9a/0x10c
>  [<ffffffff80267fd1>] ? pdflush+0x0/0x1e9
>  [<ffffffff80267fd1>] ? pdflush+0x0/0x1e9
>  [<ffffffff8026810e>] pdflush+0x13d/0x1e9
>  [<ffffffff80267541>] ? wb_kupdate+0x0/0x10c
>  [<ffffffff80248222>] kthread+0x49/0x77
>  [<ffffffff8020c5e9>] child_rip+0xa/0x11
>  [<ffffffff802481d9>] ? kthread+0x0/0x77
>  [<ffffffff8020c5df>] ? child_rip+0x0/0x11
> 
> 
> --
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Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.

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