f2fs: avoid unnecessary bio submit when wait page writeback
This patch introduce is_merged_page() to check whether current page is merged
in f2fs bio cache. When page is not in cache, we can avoid submitting bio cache,
resulting in having more chance to merge pages.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b0c923a..598bfa6 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -134,7 +134,7 @@
io = is_read_io(rw) ? &sbi->read_io : &sbi->write_io[btype];
- mutex_lock(&io->io_mutex);
+ down_write(&io->io_rwsem);
/* change META to META_FLUSH in the checkpoint procedure */
if (type >= META_FLUSH) {
@@ -142,7 +142,7 @@
io->fio.rw = WRITE_FLUSH_FUA | REQ_META | REQ_PRIO;
}
__submit_merged_bio(io);
- mutex_unlock(&io->io_mutex);
+ up_write(&io->io_rwsem);
}
/*
@@ -180,7 +180,7 @@
verify_block_addr(sbi, blk_addr);
- mutex_lock(&io->io_mutex);
+ down_write(&io->io_rwsem);
if (!is_read)
inc_page_count(sbi, F2FS_WRITEBACK);
@@ -204,7 +204,7 @@
io->last_block_in_bio = blk_addr;
- mutex_unlock(&io->io_mutex);
+ up_write(&io->io_rwsem);
trace_f2fs_submit_page_mbio(page, fio->rw, fio->type, blk_addr);
}