Re: [PATCH v2 6/6] f2fs: introduce FAULT_INCONSISTENCE

From: Jaegeuk Kim
Date: Wed Dec 27 2023 - 18:06:33 EST

On 12/25, Chao Yu wrote:
> We will encounter below inconsistent status when FAULT_BLKADDR type
> fault injection is on.
>
> Info: checkpoint state = d6 : nat_bits crc fsck compacted_summary orphan_inodes sudden-power-off
> [ASSERT] (fsck_chk_inode_blk:1254) --> ino: 0x1c100 has i_blocks: 000000c0, but has 191 blocks
> [FIX] (fsck_chk_inode_blk:1260) --> [0x1c100] i_blocks=0x000000c0 -> 0xbf
> [FIX] (fsck_chk_inode_blk:1269) --> [0x1c100] i_compr_blocks=0x00000026 -> 0x27
> [ASSERT] (fsck_chk_inode_blk:1254) --> ino: 0x1cadb has i_blocks: 0000002f, but has 46 blocks
> [FIX] (fsck_chk_inode_blk:1260) --> [0x1cadb] i_blocks=0x0000002f -> 0x2e
> [FIX] (fsck_chk_inode_blk:1269) --> [0x1cadb] i_compr_blocks=0x00000011 -> 0x12
> [ASSERT] (fsck_chk_inode_blk:1254) --> ino: 0x1c62c has i_blocks: 00000002, but has 1 blocks
> [FIX] (fsck_chk_inode_blk:1260) --> [0x1c62c] i_blocks=0x00000002 -> 0x1
>
> After we inject fault into f2fs_is_valid_blkaddr() during truncation,
> a) it missed to increase @nr_free or @valid_blocks
> b) it can cause in blkaddr leak in truncated dnode
> Which may cause inconsistent status.
>
> This patch separates FAULT_INCONSISTENCE from FAULT_BLKADDR, so that

Could you please rename FAULT_INCONSISTENCE to give exactly what it tries
to break?

> we can:
> a) use FAULT_INCONSISTENCE in f2fs_truncate_data_blocks_range() to
> simulate inconsistent issue independently,
> b) FAULT_BLKADDR fault will not cause any inconsistent status, we can
> just use it to check error path handling in kernel side.
>
> Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
> ---
> v2:
> - make __f2fs_is_valid_blkaddr() void.
> Documentation/ABI/testing/sysfs-fs-f2fs | 1 +
> Documentation/filesystems/f2fs.rst | 1 +
> fs/f2fs/checkpoint.c | 19 +++++++++++++++----
> fs/f2fs/f2fs.h | 3 +++
> fs/f2fs/file.c | 8 ++++++--
> fs/f2fs/super.c | 1 +
> 6 files changed, 27 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index 4f1d4e636d67..649aabac16c2 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -708,6 +708,7 @@ Description: Support configuring fault injection type, should be
> FAULT_DQUOT_INIT 0x000010000
> FAULT_LOCK_OP 0x000020000
> FAULT_BLKADDR 0x000040000
> + FAULT_INCONSISTENCE 0x000080000
> =================== ===========
>
> What: /sys/fs/f2fs/<disk>/discard_io_aware_gran
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index d32c6209685d..5616fb8ae207 100644
> --- a/Documentation/filesystems/f2fs.rst
> +++ b/Documentation/filesystems/f2fs.rst
> @@ -206,6 +206,7 @@ fault_type=%d Support configuring fault injection type, should be
> FAULT_DQUOT_INIT 0x000010000
> FAULT_LOCK_OP 0x000020000
> FAULT_BLKADDR 0x000040000
> + FAULT_INCONSISTENCE 0x000080000
> =================== ===========
> mode=%s Control block allocation mode which supports "adaptive"
> and "lfs". In "lfs" mode, there should be no random
> diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
> index b0597a539fc5..84546f529cf0 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -170,12 +170,9 @@ static bool __is_bitmap_valid(struct f2fs_sb_info *sbi, block_t blkaddr,
> return exist;
> }
>
> -bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> +static bool __f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> block_t blkaddr, int type)
> {
> - if (time_to_inject(sbi, FAULT_BLKADDR))
> - return false;
> -
> switch (type) {
> case META_NAT:
> break;
> @@ -230,6 +227,20 @@ bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> return true;
> }
>
> +bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> + block_t blkaddr, int type)
> +{
> + if (time_to_inject(sbi, FAULT_BLKADDR))
> + return false;
> + return __f2fs_is_valid_blkaddr(sbi, blkaddr, type);
> +}
> +
> +bool f2fs_is_valid_blkaddr_raw(struct f2fs_sb_info *sbi,
> + block_t blkaddr, int type)
> +{
> + return __f2fs_is_valid_blkaddr(sbi, blkaddr, type);
> +}
> +
> /*
> * Readahead CP/NAT/SIT/SSA/POR pages
> */
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 34b20700b5ec..3985296e64cb 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -61,6 +61,7 @@ enum {
> FAULT_DQUOT_INIT,
> FAULT_LOCK_OP,
> FAULT_BLKADDR,
> + FAULT_INCONSISTENCE,
> FAULT_MAX,
> };
>
> @@ -3767,6 +3768,8 @@ struct page *f2fs_get_meta_page_retry(struct f2fs_sb_info *sbi, pgoff_t index);
> struct page *f2fs_get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index);
> bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
> block_t blkaddr, int type);
> +bool f2fs_is_valid_blkaddr_raw(struct f2fs_sb_info *sbi,
> + block_t blkaddr, int type);
> int f2fs_ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
> int type, bool sync);
> void f2fs_ra_meta_pages_cond(struct f2fs_sb_info *sbi, pgoff_t index,
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 9f4e21b5916c..b5149f1f2a20 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -590,9 +590,13 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
> f2fs_set_data_blkaddr(dn, NULL_ADDR);
>
> if (__is_valid_data_blkaddr(blkaddr)) {
> - if (!f2fs_is_valid_blkaddr(sbi, blkaddr,
> - DATA_GENERIC_ENHANCE))
> + if (time_to_inject(sbi, FAULT_INCONSISTENCE))
> + continue;
> + if (!f2fs_is_valid_blkaddr_raw(sbi, blkaddr,
> + DATA_GENERIC_ENHANCE)) {
> + f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
> continue;
> + }
> if (compressed_cluster)
> valid_blocks++;
> }
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 206d03c82d96..9a5c5e06f766 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -62,6 +62,7 @@ const char *f2fs_fault_name[FAULT_MAX] = {
> [FAULT_DQUOT_INIT] = "dquot initialize",
> [FAULT_LOCK_OP] = "lock_op",
> [FAULT_BLKADDR] = "invalid blkaddr",
> + [FAULT_INCONSISTENCE] = "inconsistence",
> };
>
> void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
> --
> 2.40.1