From: Alex Tomas <alex@clusterfs.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Tomas <alex@clusterfs.com>,
Eric Sandeen <sandeen@redhat.com>,
"Theodore Ts'o" <tytso@mit.edu>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
Subject: Re: booked-page-flag.patch
Date: Fri, 16 Feb 2007 10:30:39 +0300 [thread overview]
Message-ID: <m3sld636g0.fsf@bzzz.home.net> (raw)
In-Reply-To: <20070215152352.6ddcfa92.akpm@linux-foundation.org> (Andrew Morton's message of "Thu\, 15 Feb 2007 15\:23\:52 -0800")
>>>>> Andrew Morton (AM) writes:
-> get_block(with BH_Delay) can be used to signal
>> filesystem that no actual allocation is required.
>> so, aware filesystem can just reserve space. then
-> writepages() should walk through the pages like
>> it does currently, collect contiugous sequences
>> and again call ->get_block(w/o BH_Delay) with b_size
>> covering all contiguous pages ...
>>
AM> That sounds like it'd work, yes.
AM> Except for an address_space which is using delayed allocation, its
-> prepare_write wouldn't call get_block at all, so perhaps that isn't
AM> needed.
hmm. I thought it has to call get_block() at least to know whether
the block is already allocated. and I was going to reserve space
in prepare_write for which some fs-specific method is needed becase
only fs knows how much metadata it'd need.
thanks, Alex
next prev parent reply other threads:[~2007-02-16 7:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-15 8:45 booked-page-flag.patch Andrew Morton
2007-02-15 14:03 ` booked-page-flag.patch Alex Tomas
2007-02-15 17:18 ` booked-page-flag.patch Eric Sandeen
2007-02-15 17:30 ` booked-page-flag.patch Alex Tomas
2007-02-15 20:56 ` booked-page-flag.patch Andrew Morton
2007-02-15 21:07 ` booked-page-flag.patch Alex Tomas
2007-02-15 23:23 ` booked-page-flag.patch Andrew Morton
2007-02-16 7:30 ` Alex Tomas [this message]
2007-02-16 7:46 ` booked-page-flag.patch Andrew Morton
2007-02-16 7:56 ` booked-page-flag.patch Alex Tomas
2007-02-16 8:06 ` booked-page-flag.patch Andrew Morton
2007-02-16 12:14 ` booked-page-flag.patch Andreas Dilger
2007-02-16 16:02 ` booked-page-flag.patch Dave Kleikamp
2007-02-16 15:03 ` booked-page-flag.patch Theodore Tso
2007-02-15 20:21 ` booked-page-flag.patch Andrew Morton
2007-02-16 12:17 ` booked-page-flag.patch Andreas Dilger
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