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

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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4
fs/f2fs/data.c
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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))