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From: Sukadev Bhattiprolu <sukadev@us.ibm.com>
To: Nikita Danilov <nikita@clusterfs.com>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: Pagewriteback clarification
Date: Wed, 28 Sep 2005 16:57:37 -0700	[thread overview]
Message-ID: <20050928235736.GA26480@us.ibm.com> (raw)
In-Reply-To: <17210.24512.240624.67693@gargle.gargle.HOWL>

Thanks for your response. Yes I was referring to filesystems/Locking.
| 
| No, callers of ->writepage() should assure that
| 
|  - page is locked, and
| 
|  - writeback bit is clear on that page.
| 
| Which means that no IO is going on against this page. When
| Documentation/filesystems/Locking talks about "currently-in-progress
| I/O" it means any IO going to or fro the device, and "blocking against
| in-progress I/O" means blocking due to device queue congestion.

So is that referring to I/Os to/from the device from say pages other than
the one in ->writepage().

I was guessing that the test_set_buffer_locked() in __block_write_full_page()
is testing if I/O is in progress for a buffer belonging to this page. Is
that not the case ?

  reply	other threads:[~2005-09-28 23:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-09-28  1:57 Pagewriteback clarification Sukadev Bhattiprolu
2005-09-28  9:17 ` Nikita Danilov
2005-09-28 23:57   ` Sukadev Bhattiprolu [this message]
2005-09-29  0:24   ` Badari Pulavarty
2005-09-29  8:47     ` Nikita Danilov

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