xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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.