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>
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@ -2967,7 +2967,6 @@ retry:
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out_writepages:
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if (!no_nrwrite_index_update)
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wbc->no_nrwrite_index_update = 0;
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if (wbc->nr_to_write > nr_to_writebump)
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wbc->nr_to_write -= nr_to_writebump;
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wbc->range_start = range_start;
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trace_ext4_da_writepages_result(inode, wbc, ret, pages_written);
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