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f2fs: introduce max_io_bytes, a sysfs entry, to limit bio size

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This patch adds max_io_bytes to limit bio size when f2fs tries to merge
consecutive IOs. This can give a testing point to split out bios and check
end_io handles those bios correctly. This is used to capture a recent bug
on the decompression and fsverity flow.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2020-12-03 09:52:45 -08:00
parent ec2ddf4994
commit 10208567f1
4 changed files with 13 additions and 0 deletions
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7
Documentation/ABI/testing/sysfs-fs-f2fs
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@ -370,3 +370,10 @@ Date: April 2020
Contact: "Daeho Jeong" <daehojeong@google.com>
Description: Give a way to change iostat_period time. 3secs by default.
The new iostat trace gives stats gap given the period.
What: /sys/fs/f2fs/<disk>/max_io_bytes
Date: December 2020
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description: This gives a control to limit the bio size in f2fs.
Default is zero, which will follow underlying block layer limit,
whereas, if it has a certain bytes value, f2fs won't submit a
bio larger than that size.

3
fs/f2fs/data.c
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@ -736,6 +736,9 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)
static bool page_is_mergeable(struct f2fs_sb_info *sbi, struct bio *bio,
block_t last_blkaddr, block_t cur_blkaddr)
{
if (unlikely(sbi->max_io_bytes &&
bio->bi_iter.bi_size >= sbi->max_io_bytes))
return false;
if (last_blkaddr + 1 != cur_blkaddr)
return false;
return __same_bdev(sbi, cur_blkaddr, bio);

1
fs/f2fs/f2fs.h
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@ -1446,6 +1446,7 @@ struct f2fs_sb_info {
loff_t max_file_blocks; /* max block index of file */
int dir_level; /* directory level */
int readdir_ra; /* readahead inode in readdir */
u64 max_io_bytes; /* max io bytes to merge IOs */
block_t user_block_count; /* # of user blocks */
block_t total_valid_block_count; /* # of valid blocks */

2
fs/f2fs/sysfs.c
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@ -567,6 +567,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info,
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_period_ms, iostat_period_ms);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_io_bytes, max_io_bytes);
F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
#ifdef CONFIG_F2FS_FAULT_INJECTION
@ -651,6 +652,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(iostat_enable),
ATTR_LIST(iostat_period_ms),
ATTR_LIST(readdir_ra),
ATTR_LIST(max_io_bytes),
ATTR_LIST(gc_pin_file_thresh),
ATTR_LIST(extension_list),
#ifdef CONFIG_F2FS_FAULT_INJECTION