ext4: Make ext4_bio_writepage() handle unprepared buffers

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So far ext4_bio_writepage() unconditionally cleared dirty bit on all
buffers underlying the page. That implicitely assumes we can write all
buffers. So far that is true because callers call into
ext4_bio_writepage() make sure all buffers in the page are mapped but:

a) it's a data corruption bug waiting to happen
b) in data=ordered mode when blocksize < pagesize we do need to write
   pages that may have only some of dirty buffers mapped.

So change ext4_bio_writepage() to skip buffers that cannot be written without
clearing their dirty bit.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

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Jan Kara 2013-01-28 20:53:28 -05:00 • committed by Theodore Ts'o

parent b6a8e62f8b

commit 8a850c3fb8

1 changed files with 9 additions and 8 deletions

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fs/ext4/page-io.c

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