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Message-ID: <cc346bd6-16bb-a38d-d0d8-ec7e928b27e9@kernel.org>
Date: Fri, 31 Mar 2023 20:58:29 +0800
From: Chao Yu <chao@...nel.org>
To: Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] f2fs: support fault injection for
f2fs_down_write_trylock()
On 2023/3/30 23:25, Yangtao Li wrote:
> Similar to FAULT_LOCK_OP, this patch supports to inject fault into
> f2fs_down_write_trylock().
I guess we can cover all trylock w/ FAULT_LOCK_OP type fault injection,
rather than just cover f2fs_down_write_trylock().
Including:
- inode_trylock
- down_read_trylock
- down_write_trylock
- mutex_trylock
- sb_start_write_trylock
- trylock_page
Bug only excluding f2fs_trylock_op which was covered by FAULT_LOCK_OP?
What do you think?
Thanks,
>
> Usage:
> a) echo 524288 > /sys/fs/f2fs/<dev>/inject_type or
> b) mount -o fault_type=524288 <dev> <mountpoint>
>
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
> v2:
> -remove f2fs_down_write_trylock macro
> Documentation/ABI/testing/sysfs-fs-f2fs | 1 +
> Documentation/filesystems/f2fs.rst | 1 +
> fs/f2fs/checkpoint.c | 4 ++--
> fs/f2fs/f2fs.h | 7 ++++++-
> fs/f2fs/file.c | 8 ++++----
> fs/f2fs/gc.c | 10 +++++-----
> fs/f2fs/node.c | 2 +-
> fs/f2fs/super.c | 1 +
> 8 files changed, 21 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
> index c1314b7fe544..fc0f82f5c9f9 100644
> --- a/Documentation/ABI/testing/sysfs-fs-f2fs
> +++ b/Documentation/ABI/testing/sysfs-fs-f2fs
> @@ -714,6 +714,7 @@ Description: Support configuring fault injection type, should be
> FAULT_DQUOT_INIT 0x000010000
> FAULT_LOCK_OP 0x000020000
> FAULT_BLKADDR 0x000040000
> + FAULT_LOCK 0x000080000
> =================== ===========
>
> What: /sys/fs/f2fs/<disk>/discard_io_aware_gran
> diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
> index 2055e72871fe..a81c896464ff 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_LOCK 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 1e0164cde23d..b119c9ab0cc1 100644
> --- a/fs/f2fs/checkpoint.c
> +++ b/fs/f2fs/checkpoint.c
> @@ -372,7 +372,7 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
> goto skip_write;
>
> /* if locked failed, cp will flush dirty pages instead */
> - if (!f2fs_down_write_trylock(&sbi->cp_global_sem))
> + if (!f2fs_down_write_trylock(sbi, &sbi->cp_global_sem))
> goto skip_write;
>
> trace_f2fs_writepages(mapping->host, wbc, META);
> @@ -1185,7 +1185,7 @@ static bool __need_flush_quota(struct f2fs_sb_info *sbi)
> if (!is_journalled_quota(sbi))
> return false;
>
> - if (!f2fs_down_write_trylock(&sbi->quota_sem))
> + if (!f2fs_down_write_trylock(sbi, &sbi->quota_sem))
> return true;
> if (is_sbi_flag_set(sbi, SBI_QUOTA_SKIP_FLUSH)) {
> ret = false;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index e73fefe0d8fb..d434c25fa175 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_LOCK,
> FAULT_MAX,
> };
>
> @@ -2193,8 +2194,12 @@ static inline void f2fs_down_write(struct f2fs_rwsem *sem)
> down_write(&sem->internal_rwsem);
> }
>
> -static inline int f2fs_down_write_trylock(struct f2fs_rwsem *sem)
> +static inline int f2fs_down_write_trylock(struct f2fs_sb_info *sbi,
> + struct f2fs_rwsem *sem)
> {
> + if (time_to_inject(sbi, FAULT_LOCK))
> + return 0;
> +
> return down_write_trylock(&sem->internal_rwsem);
> }
>
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 14e9a20e68df..db8c435d6201 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2462,7 +2462,7 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
> return ret;
>
> if (!sync) {
> - if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
> + if (!f2fs_down_write_trylock(sbi, &sbi->gc_lock)) {
> ret = -EBUSY;
> goto out;
> }
> @@ -2506,7 +2506,7 @@ static int __f2fs_ioc_gc_range(struct file *filp, struct f2fs_gc_range *range)
>
> do_more:
> if (!range->sync) {
> - if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
> + if (!f2fs_down_write_trylock(sbi, &sbi->gc_lock)) {
> ret = -EBUSY;
> goto out;
> }
> @@ -2851,7 +2851,7 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
> f2fs_down_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
> if (src != dst) {
> ret = -EBUSY;
> - if (!f2fs_down_write_trylock(&F2FS_I(dst)->i_gc_rwsem[WRITE]))
> + if (!f2fs_down_write_trylock(sbi, &F2FS_I(dst)->i_gc_rwsem[WRITE]))
> goto out_src;
> }
>
> @@ -2971,7 +2971,7 @@ static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
> end_segno = min(start_segno + range.segments, dev_end_segno);
>
> while (start_segno < end_segno) {
> - if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
> + if (!f2fs_down_write_trylock(sbi, &sbi->gc_lock)) {
> ret = -EBUSY;
> goto out;
> }
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 7e97e4284db5..302950c6cbeb 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -104,7 +104,7 @@ static int gc_thread_func(void *data)
> if (foreground) {
> f2fs_down_write(&sbi->gc_lock);
> goto do_gc;
> - } else if (!f2fs_down_write_trylock(&sbi->gc_lock)) {
> + } else if (!f2fs_down_write_trylock(sbi, &sbi->gc_lock)) {
> stat_other_skip_bggc_count(sbi);
> goto next;
> }
> @@ -1577,7 +1577,7 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
> return submitted;
> }
>
> - if (!f2fs_down_write_trylock(
> + if (!f2fs_down_write_trylock(sbi,
> &F2FS_I(inode)->i_gc_rwsem[WRITE])) {
> iput(inode);
> sbi->skipped_gc_rwsem++;
> @@ -1620,11 +1620,11 @@ static int gc_data_segment(struct f2fs_sb_info *sbi, struct f2fs_summary *sum,
> int err;
>
> if (S_ISREG(inode->i_mode)) {
> - if (!f2fs_down_write_trylock(&fi->i_gc_rwsem[READ])) {
> + if (!f2fs_down_write_trylock(sbi, &fi->i_gc_rwsem[READ])) {
> sbi->skipped_gc_rwsem++;
> continue;
> }
> - if (!f2fs_down_write_trylock(
> + if (!f2fs_down_write_trylock(sbi,
> &fi->i_gc_rwsem[WRITE])) {
> sbi->skipped_gc_rwsem++;
> f2fs_up_write(&fi->i_gc_rwsem[READ]);
> @@ -2150,7 +2150,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
> secs = div_u64(shrunk_blocks, BLKS_PER_SEC(sbi));
>
> /* stop other GC */
> - if (!f2fs_down_write_trylock(&sbi->gc_lock))
> + if (!f2fs_down_write_trylock(sbi, &sbi->gc_lock))
> return -EAGAIN;
>
> /* stop CP to protect MAIN_SEC in free_segment_range */
> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
> index bd1dad523796..e8e838f72ae6 100644
> --- a/fs/f2fs/node.c
> +++ b/fs/f2fs/node.c
> @@ -517,7 +517,7 @@ int f2fs_try_to_free_nats(struct f2fs_sb_info *sbi, int nr_shrink)
> struct f2fs_nm_info *nm_i = NM_I(sbi);
> int nr = nr_shrink;
>
> - if (!f2fs_down_write_trylock(&nm_i->nat_tree_lock))
> + if (!f2fs_down_write_trylock(sbi, &nm_i->nat_tree_lock))
> return 0;
>
> spin_lock(&nm_i->nat_list_lock);
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 7d0202f7b317..768be1c76a47 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_LOCK] = "lock",
> };
>
> void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
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