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Commit 44759560 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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f2fs: keep migration IO order in LFS mode 



For non-migration IO, we will keep order of data/node blocks' submitting
as allocation sequence by sorting IOs in per log io_list list, but for
migration IO, it could be out-of-order.

In LFS mode, we should keep all IOs including migration IO be ordered,
so that this patch fixes to add an additional lock to keep submitting
order.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarYunlong Song <yunlong.song@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent b293719d

fs/f2fs/f2fs.h

+2 −0
Original line number Diff line number Diff line
@@ -1212,6 +1212,8 @@ struct f2fs_sb_info { 
	struct f2fs_bio_info *write_io[NR_PAGE_TYPE];	/* for write bios */

	struct mutex wio_mutex[NR_PAGE_TYPE - 1][NR_TEMP_TYPE];

						/* bio ordering for NODE/DATA */

	/* keep migration IO order for LFS mode */

	struct rw_semaphore io_order_lock;

	mempool_t *write_io_dummy;		/* Dummy pages */



	/* for checkpoint */

fs/f2fs/gc.c

+6 −0
Original line number Diff line number Diff line
@@ -614,6 +614,7 @@ static void move_data_block(struct inode *inode, block_t bidx, 
	struct page *page;

	block_t newaddr;

	int err;

	bool lfs_mode = test_opt(fio.sbi, LFS);



	/* do not read out */

	page = f2fs_grab_cache_page(inode->i_mapping, bidx, false);
@@ -654,6 +655,9 @@ static void move_data_block(struct inode *inode, block_t bidx, 
	fio.page = page;

	fio.new_blkaddr = fio.old_blkaddr = dn.data_blkaddr;



	if (lfs_mode)

		down_write(&fio.sbi->io_order_lock);



	allocate_data_block(fio.sbi, NULL, fio.old_blkaddr, &newaddr,

					&sum, CURSEG_COLD_DATA, NULL, false);
@@ -710,6 +714,8 @@ static void move_data_block(struct inode *inode, block_t bidx, 
put_page_out:

	f2fs_put_page(fio.encrypted_page, 1);

recover_block:

	if (lfs_mode)

		up_write(&fio.sbi->io_order_lock);

	if (err)

		__f2fs_replace_block(fio.sbi, &sum, newaddr, fio.old_blkaddr,

								true, true);

fs/f2fs/segment.c

+5 −0
Original line number Diff line number Diff line
@@ -2833,7 +2833,10 @@ static void do_write_page(struct f2fs_summary *sum, struct f2fs_io_info *fio) 
{

	int type = __get_segment_type(fio);

	int err;

	bool keep_order = (test_opt(fio->sbi, LFS) && type == CURSEG_COLD_DATA);



	if (keep_order)

		down_read(&fio->sbi->io_order_lock);

reallocate:

	allocate_data_block(fio->sbi, fio->page, fio->old_blkaddr,

			&fio->new_blkaddr, sum, type, fio, true);
@@ -2846,6 +2849,8 @@ reallocate: 
	} else if (!err) {

		update_device_state(fio);

	}

	if (keep_order)

		up_read(&fio->sbi->io_order_lock);

}



void write_meta_page(struct f2fs_sb_info *sbi, struct page *page,

fs/f2fs/super.c

+1 −0
Original line number Diff line number Diff line
@@ -2416,6 +2416,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi) 
	for (i = 0; i < NR_PAGE_TYPE - 1; i++)

		for (j = HOT; j < NR_TEMP_TYPE; j++)

			mutex_init(&sbi->wio_mutex[i][j]);

	init_rwsem(&sbi->io_order_lock);

	spin_lock_init(&sbi->cp_lock);



	sbi->dirty_device = 0;