From: Chao Yu Date: Sun, 4 Jan 2026 02:07:29 +0000 (+0800) Subject: f2fs: sysfs: introduce inject_lock_timeout X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d36de29f4bb59b24e57ff22403baae6fc7e89bd8;p=thirdparty%2Fkernel%2Flinux.git f2fs: sysfs: introduce inject_lock_timeout This patch adds a new sysfs node in /sys/fs/f2fs//inject_lock_timeout, it relies on CONFIG_F2FS_FAULT_INJECTION kernel config. It can be used to simulate different type of timeout in lock duration. ========== =============================== Flag_Value Flag_Description ========== =============================== 0x00000000 No timeout (default) 0x00000001 Simulate running time 0x00000002 Simulate IO type sleep time 0x00000003 Simulate Non-IO type sleep time 0x00000004 Simulate runnable time ========== =============================== Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 4b0bec3c0746..ca9ed3b44b31 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -948,3 +948,17 @@ Description: This is a threshold, once a thread enters critical region that lock elapsed time exceeds this threshold, f2fs will print tracepoint to dump information of related context. This sysfs entry can be used to control the value of threshold, by default, the value is 500 ms. + +What: /sys/fs/f2fs//inject_timeout_type +Date: December 2025 +Contact: "Chao Yu" +Description: This sysfs entry can be used to change type of injected timeout: + ========== =============================== + Flag_Value Flag_Description + ========== =============================== + 0x00000000 No timeout (default) + 0x00000001 Simulate running time + 0x00000002 Simulate IO type sleep time + 0x00000003 Simulate Non-IO type sleep time + 0x00000004 Simulate runnable time + ========== =============================== diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index f2ab5ba8fb6a..3dfc83a0813e 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -64,7 +64,7 @@ static inline void trace_lock_elapsed_time_end(struct f2fs_rwsem *sem, return; if (time_to_inject(sem->sbi, FAULT_LOCK_TIMEOUT)) - f2fs_io_schedule_timeout_killable(DEFAULT_FAULT_TIMEOUT); + f2fs_schedule_timeout_killable(DEFAULT_FAULT_TIMEOUT, true); get_lock_elapsed_time(&tts); diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 68fa9fd9cd5d..399514187280 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -73,7 +73,8 @@ enum { enum fault_option { FAULT_RATE = 1, /* only update fault rate */ FAULT_TYPE = 2, /* only update fault type */ - FAULT_ALL = 4, /* reset all fault injection options/stats */ + FAULT_TIMEOUT = 4, /* only update fault timeout type */ + FAULT_ALL = 8, /* reset all fault injection options/stats */ }; #ifdef CONFIG_F2FS_FAULT_INJECTION @@ -83,6 +84,7 @@ struct f2fs_fault_info { unsigned int inject_type; /* Used to account total count of injection for each type */ unsigned int inject_count[FAULT_MAX]; + unsigned int inject_lock_timeout; /* inject lock timeout */ }; extern const char *f2fs_fault_name[FAULT_MAX]; @@ -184,6 +186,15 @@ enum f2fs_lock_name { LOCK_NAME_IO_RWSEM, }; +enum f2fs_timeout_type { + TIMEOUT_TYPE_NONE, + TIMEOUT_TYPE_RUNNING, + TIMEOUT_TYPE_IO_SLEEP, + TIMEOUT_TYPE_NONIO_SLEEP, + TIMEOUT_TYPE_RUNNABLE, + TIMEOUT_TYPE_MAX, +}; + /* * An implementation of an rwsem that is explicitly unfair to readers. This * prevents priority inversion when a low-priority reader acquires the read lock @@ -4927,6 +4938,7 @@ static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx) #ifdef CONFIG_F2FS_FAULT_INJECTION extern int f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned long rate, unsigned long type, enum fault_option fo); +extern void f2fs_simulate_lock_timeout(struct f2fs_sb_info *sbi); #else static inline int f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned long rate, unsigned long type, @@ -4934,6 +4946,10 @@ static inline int f2fs_build_fault_attr(struct f2fs_sb_info *sbi, { return 0; } +static inline void f2fs_simulate_lock_timeout(struct f2fs_sb_info *sbi) +{ + return; +} #endif static inline bool is_journalled_quota(struct f2fs_sb_info *sbi) @@ -4984,14 +5000,14 @@ static inline void __f2fs_schedule_timeout(long timeout, bool io) #define f2fs_schedule_timeout(timeout) \ __f2fs_schedule_timeout(timeout, false) -static inline void f2fs_io_schedule_timeout_killable(long timeout) +static inline void f2fs_schedule_timeout_killable(long timeout, bool io) { unsigned long last_time = jiffies + timeout; while (jiffies < last_time) { if (fatal_signal_pending(current)) return; - __f2fs_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT, true); + __f2fs_schedule_timeout(DEFAULT_SCHEDULE_TIMEOUT, io); } } diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 469d37c37398..587ae3b4bfd8 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -372,7 +372,7 @@ next: out: if (time_to_inject(sbi, FAULT_ATOMIC_TIMEOUT)) - f2fs_io_schedule_timeout_killable(DEFAULT_FAULT_TIMEOUT); + f2fs_schedule_timeout_killable(DEFAULT_FAULT_TIMEOUT, true); if (ret) { sbi->revoked_atomic_block += fi->atomic_write_cnt; diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 30e6cf027ba7..4573bac94793 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -97,8 +97,57 @@ int f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned long rate, f2fs_info(sbi, "build fault injection type: 0x%lx", type); } + if (fo & FAULT_TIMEOUT) { + if (type >= TIMEOUT_TYPE_MAX) + return -EINVAL; + ffi->inject_lock_timeout = (unsigned int)type; + f2fs_info(sbi, "build fault timeout injection type: 0x%lx", type); + } + return 0; } + +static void inject_timeout(struct f2fs_sb_info *sbi) +{ + struct f2fs_fault_info *ffi = &F2FS_OPTION(sbi).fault_info; + enum f2fs_timeout_type type = ffi->inject_lock_timeout; + unsigned long start_time = jiffies; + unsigned long timeout = HZ; + + switch (type) { + case TIMEOUT_TYPE_RUNNING: + while (!time_after(jiffies, start_time + timeout)) { + if (fatal_signal_pending(current)) + return; + ; + } + break; + case TIMEOUT_TYPE_IO_SLEEP: + f2fs_schedule_timeout_killable(timeout, true); + break; + case TIMEOUT_TYPE_NONIO_SLEEP: + f2fs_schedule_timeout_killable(timeout, false); + break; + case TIMEOUT_TYPE_RUNNABLE: + while (!time_after(jiffies, start_time + timeout)) { + if (fatal_signal_pending(current)) + return; + schedule(); + } + break; + default: + return; + } +} + +void f2fs_simulate_lock_timeout(struct f2fs_sb_info *sbi) +{ + struct f2fs_lock_context lc; + + f2fs_lock_op(sbi, &lc); + inject_timeout(sbi); + f2fs_unlock_op(sbi, &lc); +} #endif /* f2fs-wide shrinker description */ diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index e03cba5a9d70..c32e4996b335 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -35,6 +35,7 @@ enum { #ifdef CONFIG_F2FS_FAULT_INJECTION FAULT_INFO_RATE, /* struct f2fs_fault_info */ FAULT_INFO_TYPE, /* struct f2fs_fault_info */ + FAULT_INFO_TIMEOUT, /* struct f2fs_fault_info */ #endif RESERVED_BLOCKS, /* struct f2fs_sb_info */ CPRC_INFO, /* struct ckpt_req_control */ @@ -529,6 +530,12 @@ out: return -EINVAL; return count; } + if (a->struct_type == FAULT_INFO_TIMEOUT) { + if (f2fs_build_fault_attr(sbi, 0, t, FAULT_TIMEOUT)) + return -EINVAL; + f2fs_simulate_lock_timeout(sbi); + return count; + } #endif if (a->struct_type == RESERVED_BLOCKS) { spin_lock(&sbi->stat_lock); @@ -1233,6 +1240,7 @@ STAT_INFO_RO_ATTR(gc_background_calls, gc_call_count[BACKGROUND]); #ifdef CONFIG_F2FS_FAULT_INJECTION FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_RATE, inject_rate); FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_TYPE, inject_type); +FAULT_INFO_GENERAL_RW_ATTR(FAULT_INFO_TIMEOUT, inject_lock_timeout); #endif /* RESERVED_BLOCKS ATTR */ @@ -1362,6 +1370,7 @@ static struct attribute *f2fs_attrs[] = { #ifdef CONFIG_F2FS_FAULT_INJECTION ATTR_LIST(inject_rate), ATTR_LIST(inject_type), + ATTR_LIST(inject_lock_timeout), #endif ATTR_LIST(data_io_flag), ATTR_LIST(node_io_flag),