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...@samsung.com>
Acked-by: Gu Zheng <guz.f...@cn.fujitsu.com>
---
fs/f2fs/data.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/f2fs.h | 3 +++
fs/f2fs/super.c | 1 +
3 files changed, 54 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index b4e4c7e..9cf3f6c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -400,6 +400,56 @@ int f2fs_readpage(struct f2fs_sb_info *sbi, struct page
*page,
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.
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a54fac2..e2cb920 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -368,6 +368,7 @@ struct f2fs_sb_info {
struct f2fs_sm_info *sm_info; /* segment manager */
/* for bio operations */
+ struct f2fs_bio_info read_io; /* for read bios */
struct f2fs_bio_info write_io[NR_PAGE_TYPE]; /* for write bios */
/* for checkpoint */
@@ -1118,6 +1119,8 @@ struct page *find_data_page(struct inode *, pgoff_t,
bool);
struct page *get_lock_data_page(struct inode *, pgoff_t);
struct page *get_new_data_page(struct inode *, struct page *, pgoff_t, bool);
int f2fs_readpage(struct f2fs_sb_info *, struct page *, block_t, int);
+void f2fs_submit_read_bio(struct f2fs_sb_info *, int);
+void submit_read_page(struct f2fs_sb_info *, struct page *, block_t, int);
int do_write_data_page(struct page *);
/*
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 344fb86..6d78fff 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -876,6 +876,7 @@ static int f2fs_fill_super(struct super_block *sb, void
*data, int silent)
sbi->por_doing = false;
spin_lock_init(&sbi->stat_lock);
+ mutex_init(&sbi->read_io.io_mutex);
for (i = 0; i < NR_PAGE_TYPE; i++)
mutex_init(&sbi->write_io[i].io_mutex);
--
1.7.9.5
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