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f2fs: fix to write node pages with WRITE_SYNC
This patch fixes performance regression of dbench reported by Alex <hbx7d@yandex.com>. This issue was revealed by Phoronix tests results: http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2 It turns out that we need to assign WRITE_SYNC to the node writes, if fsync is triggered. The performance numbers are like below, which is measured by Alex. 1. 355MB/s ext4 2. 225MB/s f2fs : WRITE for node writes 3. 525MB/s f2fs : WRITE_SYNC for node writes Reported-And-Tested-by: Alex <hbx7d@yandex.com>. Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
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@ -115,7 +115,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
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int ret = 0;
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bool need_cp = false;
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struct writeback_control wbc = {
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.sync_mode = WB_SYNC_NONE,
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.sync_mode = WB_SYNC_ALL,
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.nr_to_write = LONG_MAX,
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.for_reclaim = 0,
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};
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