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prevent cifs_writepages() from skipping unwritten pages

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Fixes a data corruption under heavy stress in which pages could be left
dirty after all open instances of a inode have been closed.

In order to write contiguous pages whenever possible, cifs_writepages()
asks pagevec_lookup_tag() for more pages than it may write at one time.
Normally, it then resets index just past the last page written before calling
pagevec_lookup_tag() again.

If cifs_writepages() can't write the first page returned, it wasn't resetting
index, and the next call to pagevec_lookup_tag() resulted in skipping all of
the pages it previously returned, even though cifs_writepages() did nothing
with them.  This can result in data loss when the file descriptor is about
to be closed.

This patch ensures that index gets set back to the next returned page so
that none get skipped.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Cc: Shirish S Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Dave Kleikamp 2008-11-18 03:49:05 +00:00 committed by Steve French
parent 2c55608f28
commit b066a48c95
1 changed files with 4 additions and 1 deletions
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5
fs/cifs/file.c
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@ -1404,7 +1404,10 @@ retry:
if ((wbc->nr_to_write -= n_iov) <= 0)
done = 1;
index = next;
}
} else
/* Need to re-find the pages we skipped */
index = pvec.pages[0]->index + 1;
pagevec_release(&pvec);
}
if (!scanned && !done) {