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f2fs: skip writing in ->writepages when no dirty pages exist

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When flushing comes from background, if there is no dirty page in the
mapping of inode, we'd better to skip seeking dirty page from mapping
for writebacking.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2015-07-17 18:02:39 +08:00
committed by Jaegeuk Kim
parent 737f18992e
commit 6a2905443c
1 changed files with 4 additions and 0 deletions
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fs/f2fs/data.c
+4
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@@ -1275,6 +1275,10 @@ static int f2fs_write_data_pages(struct address_space *mapping,
if (!mapping->a_ops->writepage)
return 0;
/* skip writing if there is no dirty page in this inode */
if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE)
return 0;
if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&
get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&
available_free_memory(sbi, DIRTY_DENTS))