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f2fs: use blk_plug in all the possible paths

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This patch reverts 19a5f5e2ef (f2fs: drop any block plugging),
and adds blk_plug in write paths additionally.

The main reason is that blk_start_plug can be used to wake up from low-power
mode before submitting further bios.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
2016-07-13 19:33:19 -07:00
parent 82e0a5aa5d
commit 9dfa1baff7
6 changed files with 29 additions and 2 deletions
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7
fs/f2fs/checkpoint.c
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@@ -265,6 +265,7 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct f2fs_sb_info *sbi = F2FS_M_SB(mapping);
struct blk_plug plug;
long diff, written;
/* collect a number of dirty meta pages and write together */
@@ -277,7 +278,9 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
/* if mounting is failed, skip writing node pages */
mutex_lock(&sbi->cp_mutex);
diff = nr_pages_to_write(sbi, META, wbc);
blk_start_plug(&plug);
written = sync_meta_pages(sbi, META, wbc->nr_to_write);
blk_finish_plug(&plug);
mutex_unlock(&sbi->cp_mutex);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
@@ -899,8 +902,11 @@ static int block_operations(struct f2fs_sb_info *sbi)
.nr_to_write = LONG_MAX,
.for_reclaim = 0,
};
struct blk_plug plug;
int err = 0;
blk_start_plug(&plug);
retry_flush_dents:
f2fs_lock_all(sbi);
/* write all the dirty dentry pages */
@@ -937,6 +943,7 @@ retry_flush_nodes:
goto retry_flush_nodes;
}
out:
blk_finish_plug(&plug);
return err;
}