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f2fs: add a new function to support for merging contiguous read

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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>
This commit is contained in:
Chao Yu 2013-11-20 14:46:39 +08:00 committed by Jaegeuk Kim
parent ce3b7d80ed
commit 924b720b58
3 changed files with 54 additions and 0 deletions
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50
fs/f2fs/data.c
View File

@ -414,6 +414,56 @@ 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.

3
fs/f2fs/f2fs.h
View File

@ -382,6 +382,7 @@ 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 */
@ -1132,6 +1133,8 @@ 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 *);
/*

1
fs/f2fs/super.c
View File

@ -878,6 +878,7 @@ 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);