f2fs: refactor bio-related operations
This patch integrates redundant bio operations on read and write IOs.
1. Move bio-related codes to the top of data.c.
2. Replace f2fs_submit_bio with f2fs_submit_merged_bio, which handles read
bios additionally.
3. Introduce __submit_merged_bio to submit the merged bio.
4. Change f2fs_readpage to f2fs_submit_page_bio.
5. Introduce f2fs_submit_page_mbio to integrate previous submit_read_page and
submit_write_page.
Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Reviewed-by: Chao Yu <chao2.yu@samsung.com >
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 0db4027..ca9adf5 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -787,146 +787,6 @@
.allocate_segment = allocate_segment_by_default,
};
-static void f2fs_end_io_write(struct bio *bio, int err)
-{
- const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
- struct f2fs_sb_info *sbi = F2FS_SB(bvec->bv_page->mapping->host->i_sb);
-
- do {
- struct page *page = bvec->bv_page;
-
- if (--bvec >= bio->bi_io_vec)
- prefetchw(&bvec->bv_page->flags);
- if (!uptodate) {
- SetPageError(page);
- if (page->mapping)
- set_bit(AS_EIO, &page->mapping->flags);
-
- set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
- sbi->sb->s_flags |= MS_RDONLY;
- }
- end_page_writeback(page);
- dec_page_count(sbi, F2FS_WRITEBACK);
- } while (bvec >= bio->bi_io_vec);
-
- if (bio->bi_private)
- complete(bio->bi_private);
-
- if (!get_pages(sbi, F2FS_WRITEBACK) &&
- !list_empty(&sbi->cp_wait.task_list))
- wake_up(&sbi->cp_wait);
-
- bio_put(bio);
-}
-
-struct bio *f2fs_bio_alloc(struct block_device *bdev, int npages)
-{
- struct bio *bio;
-
- /* No failure on bio allocation */
- bio = bio_alloc(GFP_NOIO, npages);
- bio->bi_bdev = bdev;
- bio->bi_private = NULL;
-
- return bio;
-}
-
-static void do_submit_bio(struct f2fs_sb_info *sbi,
- enum page_type type, bool sync)
-{
- int rw = sync ? WRITE_SYNC : WRITE;
- enum page_type btype = PAGE_TYPE_OF_BIO(type);
- struct f2fs_bio_info *io = &sbi->write_io[btype];
-
- if (!io->bio)
- return;
-
- if (type >= META_FLUSH)
- rw = WRITE_FLUSH_FUA;
-
- if (btype == META)
- rw |= REQ_META;
-
- trace_f2fs_submit_write_bio(sbi->sb, rw, btype, io->bio);
-
- /*
- * META_FLUSH is only from the checkpoint procedure, and we should wait
- * this metadata bio for FS consistency.
- */
- if (type == META_FLUSH) {
- DECLARE_COMPLETION_ONSTACK(wait);
- io->bio->bi_private = &wait;
- submit_bio(rw, io->bio);
- wait_for_completion(&wait);
- } else {
- submit_bio(rw, io->bio);
- }
- io->bio = NULL;
-}
-
-void f2fs_submit_bio(struct f2fs_sb_info *sbi, enum page_type type, bool sync)
-{
- struct f2fs_bio_info *io = &sbi->write_io[PAGE_TYPE_OF_BIO(type)];
-
- if (!io->bio)
- return;
-
- mutex_lock(&io->io_mutex);
- do_submit_bio(sbi, type, sync);
- mutex_unlock(&io->io_mutex);
-}
-
-static void submit_write_page(struct f2fs_sb_info *sbi, struct page *page,
- block_t blk_addr, enum page_type type)
-{
- struct block_device *bdev = sbi->sb->s_bdev;
- struct f2fs_bio_info *io = &sbi->write_io[type];
- int bio_blocks;
-
- verify_block_addr(sbi, blk_addr);
-
- mutex_lock(&io->io_mutex);
-
- inc_page_count(sbi, F2FS_WRITEBACK);
-
- if (io->bio && io->last_block_in_bio != blk_addr - 1)
- do_submit_bio(sbi, type, false);
-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 = f2fs_end_io_write;
- /*
- * The end_io will be assigned at the sumbission phase.
- * Until then, let bio_add_page() merge consecutive IOs as much
- * as possible.
- */
- }
-
- if (bio_add_page(io->bio, page, PAGE_CACHE_SIZE, 0) <
- PAGE_CACHE_SIZE) {
- do_submit_bio(sbi, type, false);
- goto alloc_new;
- }
-
- io->last_block_in_bio = blk_addr;
-
- mutex_unlock(&io->io_mutex);
- trace_f2fs_submit_write_page(page, WRITE, type, blk_addr);
-}
-
-void f2fs_wait_on_page_writeback(struct page *page,
- enum page_type type, bool sync)
-{
- struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
- if (PageWriteback(page)) {
- f2fs_submit_bio(sbi, type, sync);
- wait_on_page_writeback(page);
- }
-}
-
static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg = CURSEG_I(sbi, type);
@@ -1040,7 +900,7 @@
fill_node_footer_blkaddr(page, NEXT_FREE_BLKADDR(sbi, curseg));
/* writeout dirty page into bdev */
- submit_write_page(sbi, page, *new_blkaddr, p_type);
+ f2fs_submit_page_mbio(sbi, page, *new_blkaddr, p_type, WRITE);
mutex_unlock(&curseg->curseg_mutex);
}
@@ -1048,7 +908,7 @@
void write_meta_page(struct f2fs_sb_info *sbi, struct page *page)
{
set_page_writeback(page);
- submit_write_page(sbi, page, page->index, META);
+ f2fs_submit_page_mbio(sbi, page, page->index, META, WRITE);
}
void write_node_page(struct f2fs_sb_info *sbi, struct page *page,
@@ -1078,7 +938,7 @@
void rewrite_data_page(struct f2fs_sb_info *sbi, struct page *page,
block_t old_blk_addr)
{
- submit_write_page(sbi, page, old_blk_addr, DATA);
+ f2fs_submit_page_mbio(sbi, page, old_blk_addr, DATA, WRITE);
}
void recover_data_page(struct f2fs_sb_info *sbi,
@@ -1165,8 +1025,8 @@
/* rewrite node page */
set_page_writeback(page);
- submit_write_page(sbi, page, new_blkaddr, NODE);
- f2fs_submit_bio(sbi, NODE, true);
+ f2fs_submit_page_mbio(sbi, page, new_blkaddr, NODE, WRITE);
+ f2fs_submit_merged_bio(sbi, NODE, true, WRITE);
refresh_sit_entry(sbi, old_blkaddr, new_blkaddr);
locate_dirty_segment(sbi, old_cursegno);
@@ -1176,6 +1036,16 @@
mutex_unlock(&curseg->curseg_mutex);
}
+void f2fs_wait_on_page_writeback(struct page *page,
+ enum page_type type, bool sync)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
+ if (PageWriteback(page)) {
+ f2fs_submit_merged_bio(sbi, type, sync, WRITE);
+ wait_on_page_writeback(page);
+ }
+}
+
static int read_compacted_summaries(struct f2fs_sb_info *sbi)
{
struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
@@ -1723,13 +1593,13 @@
continue;
}
- submit_read_page(sbi, page, blk_addr, READ_SYNC | REQ_META);
+ f2fs_submit_page_mbio(sbi, page, blk_addr, META, READ);
mark_page_accessed(page);
f2fs_put_page(page, 0);
}
- f2fs_submit_read_bio(sbi, READ_SYNC | REQ_META);
+ f2fs_submit_merged_bio(sbi, META, true, READ);
return blkno - start;
}