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Clear PG_writeback after zil_commit() for sync I/O
When writing via ->writepage() the writeback bit was always cleared as part of the txg commit callback. However, when the I/O is also being written synchronsously to the zil we can immediately clear this bit. There is no need to wait for the subsequent TXG sync since the data is already safe on stable storage. This has been observed to reduce the msync(2) delay from up to 5 seconds down 10s of miliseconds. One workload which is expected to benefit from this are the intermittent samba hands described in issue #700. Signed-off-by: Brian Behlendorf <firstname.lastname@example.org> Closes #700 Closes #907
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