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ext4: return correct wbc.nr_to_write in ext4_da_writepages 

When ext4_da_writepages increases the nr_to_write in writeback_control
then it must always re-base the return value.  Originally there was a
(misguided) attempt prevent wbc.nr_to_write from going negative.  In
fact, it's necessary to allow nr_to_write to be negative so that
wb_writeback() can correctly calculate how many pages were actually
written.  

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Richard Kennedy 2009-12-25 15:46:07 -05:00 committed by Theodore Ts'o
parent 6d3b82f2d3
commit 2faf2e19dd
1 changed files with 1 additions and 2 deletions
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3
fs/ext4/inode.c
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@ -2967,8 +2967,7 @@ static int ext4_da_writepages(struct address_space *mapping,
out_writepages:
if (!no_nrwrite_index_update)
wbc->no_nrwrite_index_update = 0;
if (wbc->nr_to_write > nr_to_writebump)
wbc->nr_to_write -= nr_to_writebump;
wbc->nr_to_write -= nr_to_writebump;
wbc->range_start = range_start;
trace_ext4_da_writepages_result(inode, wbc, ret, pages_written);
return ret;