f2fs: add a new function to support for merging contiguous read
For better read performance, we add a new function to support for merging
contiguous read as the one for write.
v1-->v2:
o add declarations here as Gu Zheng suggested.
o use new structure f2fs_bio_info introduced by Jaegeuk Kim.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Acked-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 2e54522..ce3cbd9 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -414,6 +414,56 @@
return 0;
}
+void f2fs_submit_read_bio(struct f2fs_sb_info *sbi, int rw)
+{
+ struct f2fs_bio_info *io = &sbi->read_io;
+
+ if (!io->bio)
+ return;
+
+ mutex_lock(&io->io_mutex);
+ if (io->bio) {
+ submit_bio(rw, io->bio);
+ io->bio = NULL;
+ }
+ mutex_unlock(&io->io_mutex);
+}
+
+void submit_read_page(struct f2fs_sb_info *sbi, struct page *page,
+ block_t blk_addr, int rw)
+{
+ struct block_device *bdev = sbi->sb->s_bdev;
+ struct f2fs_bio_info *io = &sbi->read_io;
+ int bio_blocks;
+
+ verify_block_addr(sbi, blk_addr);
+
+ mutex_lock(&io->io_mutex);
+
+ if (io->bio && io->last_block_in_bio != blk_addr - 1) {
+ submit_bio(rw, io->bio);
+ io->bio = NULL;
+ }
+alloc_new:
+ if (io->bio == NULL) {
+ bio_blocks = MAX_BIO_BLOCKS(max_hw_blocks(sbi));
+ io->bio = f2fs_bio_alloc(bdev, bio_blocks);
+ io->bio->bi_sector = SECTOR_FROM_BLOCK(sbi, blk_addr);
+ io->bio->bi_end_io = read_end_io;
+ }
+
+ if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
+ PAGE_CACHE_SIZE) {
+ submit_bio(rw, io->bio);
+ io->bio = NULL;
+ goto alloc_new;
+ }
+
+ io->last_block_in_bio = blk_addr;
+
+ mutex_unlock(&io->io_mutex);
+}
+
/*
* This function should be used by the data read flow only where it
* does not check the "create" flag that indicates block allocation.