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Message-ID: <a5775576-0337-4fe4-af44-817f5b39b628@kernel.org>
Date: Wed, 30 Apr 2025 11:15:17 +0800
From: Chao Yu <chao@...nel.org>
To: Daeho Jeong <daeho43@...il.com>, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc: chao@...nel.org, Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v4] f2fs-tools: introduce fault injection to
fsck
On 2025/4/30 01:55, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@...gle.com>
>
> Due to the difficulty of intentionally corrupting specific metadata on
> some storage devices like zoned storage devices, it is challenging to
> effectively verify fsck functionality. To facilitate this verification,
> it is necessary to add a fault injection mode.
Daeho, seems we need to rebase this patch to last dev-test branch? It
may conflict w/ ("fsck.f2fs: support to tune linear lookup feature"), we
need to handle the conflict.
>
> Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> ---
> v4: fix print type and typos in man page
> v3: set limit on fault counts
> v2: print fault injection result
> ---
> fsck/fsck.c | 123 +++++++++++++++++++++++++++++++++++-----------
> fsck/main.c | 22 +++++++++
> fsck/mkquota.c | 3 ++
> include/f2fs_fs.h | 58 ++++++++++++++++++++++
> man/fsck.f2fs.8 | 36 ++++++++++++++
> 5 files changed, 213 insertions(+), 29 deletions(-)
>
> diff --git a/fsck/fsck.c b/fsck/fsck.c
> index 8155cbd..b18e692 100644
> --- a/fsck/fsck.c
> +++ b/fsck/fsck.c
> @@ -16,6 +16,20 @@
> char *tree_mark;
> uint32_t tree_mark_size = 256;
>
> +const char *f2fs_fault_name[FAULT_MAX] = {
> + [FAULT_SEG_TYPE] = "FAULT_SEG_TYPE",
> + [FAULT_SUM_TYPE] = "FAULT_SUM_TYPE",
> + [FAULT_SUM_ENT] = "FAULT_SUM_ENTRY",
> + [FAULT_NAT] = "FAULT_NAT_ENTRY",
> + [FAULT_NODE] = "FAULT_NODE_BLOCK",
> + [FAULT_XATTR_ENT] = "FAULT_XATTR_ENTRY",
> + [FAULT_COMPR] = "FAULT_COMPR_TYPE",
> + [FAULT_INODE] = "FAULT_INODE_ENTRY",
> + [FAULT_DENTRY] = "FAULT_DENTRY_BLOCK",
> + [FAULT_DATA] = "FAULT_DATA_BLOCK",
> + [FAULT_QUOTA] = "FAULT_QUOTA",
> +};
> +
> int f2fs_set_main_bitmap(struct f2fs_sb_info *sbi, u32 blk, int type)
> {
> struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
> @@ -23,9 +37,9 @@ int f2fs_set_main_bitmap(struct f2fs_sb_info *sbi, u32 blk, int type)
> int fix = 0;
>
> se = get_seg_entry(sbi, GET_SEGNO(sbi, blk));
> - if (se->type >= NO_CHECK_TYPE)
> - fix = 1;
> - else if (IS_DATASEG(se->type) != IS_DATASEG(type))
> + if (time_to_inject(FAULT_SEG_TYPE) ||
> + (se->type >= NO_CHECK_TYPE) ||
> + (IS_DATASEG(se->type) != IS_DATASEG(type)))
> fix = 1;
>
> /* just check data and node types */
> @@ -168,7 +182,8 @@ static int is_valid_ssa_node_blk(struct f2fs_sb_info *sbi, u32 nid,
>
> sum_blk = get_sum_block(sbi, segno, &type);
>
> - if (type != SEG_TYPE_NODE && type != SEG_TYPE_CUR_NODE) {
> + if (time_to_inject(FAULT_SUM_TYPE) ||
> + (type != SEG_TYPE_NODE && type != SEG_TYPE_CUR_NODE)) {
> /* can't fix current summary, then drop the block */
> if (!c.fix_on || type < 0) {
> ASSERT_MSG("Summary footer is not for node segment");
> @@ -189,7 +204,8 @@ static int is_valid_ssa_node_blk(struct f2fs_sb_info *sbi, u32 nid,
>
> sum_entry = &(sum_blk->entries[offset]);
>
> - if (le32_to_cpu(sum_entry->nid) != nid) {
> + if (time_to_inject(FAULT_SUM_ENT) ||
> + (le32_to_cpu(sum_entry->nid) != nid)) {
> if (!c.fix_on || type < 0) {
> DBG(0, "nid [0x%x]\n", nid);
> DBG(0, "target blk_addr [0x%x]\n", blk_addr);
> @@ -282,7 +298,7 @@ static int is_valid_ssa_data_blk(struct f2fs_sb_info *sbi, u32 blk_addr,
> struct f2fs_summary *sum_entry;
> struct seg_entry * se;
> u32 segno, offset;
> - int need_fix = 0, ret = 0;
> + int need_fix = 0, ret = 0, fault_sum_ent = 0;
> int type;
>
> if (get_sb(feature) & F2FS_FEATURE_RO)
> @@ -293,7 +309,8 @@ static int is_valid_ssa_data_blk(struct f2fs_sb_info *sbi, u32 blk_addr,
>
> sum_blk = get_sum_block(sbi, segno, &type);
>
> - if (type != SEG_TYPE_DATA && type != SEG_TYPE_CUR_DATA) {
> + if (time_to_inject(FAULT_SUM_TYPE) ||
> + (type != SEG_TYPE_DATA && type != SEG_TYPE_CUR_DATA)) {
> /* can't fix current summary, then drop the block */
> if (!c.fix_on || type < 0) {
> ASSERT_MSG("Summary footer is not for data segment");
> @@ -314,7 +331,10 @@ static int is_valid_ssa_data_blk(struct f2fs_sb_info *sbi, u32 blk_addr,
>
> sum_entry = &(sum_blk->entries[offset]);
>
> - if (le32_to_cpu(sum_entry->nid) != parent_nid ||
> + if (time_to_inject(FAULT_SUM_ENT))
> + fault_sum_ent = 1;
> +
> + if (fault_sum_ent || le32_to_cpu(sum_entry->nid) != parent_nid ||
> sum_entry->version != version ||
> le16_to_cpu(sum_entry->ofs_in_node) != idx_in_node) {
> if (!c.fix_on || type < 0) {
> @@ -333,7 +353,8 @@ static int is_valid_ssa_data_blk(struct f2fs_sb_info *sbi, u32 blk_addr,
> DBG(0, "Target data block addr [0x%x]\n", blk_addr);
> ASSERT_MSG("Invalid data seg summary\n");
> ret = -EINVAL;
> - } else if (is_valid_summary(sbi, sum_entry, blk_addr)) {
> + } else if (!fault_sum_ent &&
> + is_valid_summary(sbi, sum_entry, blk_addr)) {
> /* delete wrong index */
> ret = -EINVAL;
> } else {
> @@ -397,6 +418,9 @@ err:
> static int sanity_check_nat(struct f2fs_sb_info *sbi, u32 nid,
> struct node_info *ni)
> {
> + if (time_to_inject(FAULT_NAT))
What do you think of add ASSERT() here to set c.bug_on to 1? it can make
the error path handling like we really encounter an inconsistent issue.
> + return -EINVAL;
> +
> if (!IS_VALID_NID(sbi, nid)) {
> ASSERT_MSG("nid is not valid. [0x%x]", nid);
> return -EINVAL;
> @@ -436,6 +460,9 @@ static int sanity_check_nid(struct f2fs_sb_info *sbi, u32 nid,
> struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
> int ret;
>
> + if (time_to_inject(FAULT_NODE))
Ditto,
> + return -EINVAL;
> +
> ret = sanity_check_nat(sbi, nid, ni);
> if (ret)
> return ret;
> @@ -865,7 +892,7 @@ int chk_extended_attributes(struct f2fs_sb_info *sbi, u32 nid,
> "end of list", nid);
> need_fix = true;
> }
> - if (need_fix && c.fix_on) {
> + if ((time_to_inject(FAULT_XATTR_ENT) || need_fix) && c.fix_on) {
> memset(ent, 0, (u8 *)last_base_addr - (u8 *)ent);
> write_all_xattrs(sbi, inode, xattr_size, xattr);
> FIX_MSG("[0x%x] nullify wrong xattr entries", nid);
> @@ -907,7 +934,8 @@ void fsck_chk_inode_blk(struct f2fs_sb_info *sbi, u32 nid,
> if (!compressed)
> goto check_next;
>
> - if (!compr_supported || (node_blk->i.i_inline & F2FS_INLINE_DATA)) {
> + if (time_to_inject(FAULT_COMPR) || !compr_supported ||
> + (node_blk->i.i_inline & F2FS_INLINE_DATA)) {
> /*
> * The 'compression' flag in i_flags affects the traverse of
> * the node tree. Thus, it must be fixed unconditionally
> @@ -943,12 +971,13 @@ check_next:
> f2fs_set_main_bitmap(sbi, ni->blk_addr,
> CURSEG_WARM_NODE);
>
> - if (i_links == 0 && (ftype == F2FS_FT_CHRDEV ||
> + if (time_to_inject(FAULT_INODE) ||
> + (i_links == 0 && (ftype == F2FS_FT_CHRDEV ||
> ftype == F2FS_FT_BLKDEV ||
> ftype == F2FS_FT_FIFO ||
> ftype == F2FS_FT_SOCK ||
> ftype == F2FS_FT_SYMLINK ||
> - ftype == F2FS_FT_REG_FILE)) {
> + ftype == F2FS_FT_REG_FILE))) {
> ASSERT_MSG("ino: 0x%x ftype: %d has i_links: %u",
> nid, ftype, i_links);
> if (c.fix_on) {
> @@ -1008,7 +1037,8 @@ check_next:
> if (c.feature & F2FS_FEATURE_EXTRA_ATTR) {
> unsigned int isize =
> le16_to_cpu(node_blk->i.i_extra_isize);
> - if (isize > 4 * DEF_ADDRS_PER_INODE) {
> + if (time_to_inject(FAULT_INODE) ||
> + (isize > 4 * DEF_ADDRS_PER_INODE)) {
> ASSERT_MSG("[0x%x] wrong i_extra_isize=0x%x",
> nid, isize);
> if (c.fix_on) {
> @@ -1038,8 +1068,9 @@ check_next:
> unsigned int inline_size =
> le16_to_cpu(node_blk->i.i_inline_xattr_size);
>
> - if (!inline_size ||
> - inline_size > MAX_INLINE_XATTR_SIZE) {
> + if (time_to_inject(FAULT_INODE) ||
> + (!inline_size ||
> + inline_size > MAX_INLINE_XATTR_SIZE)) {
> ASSERT_MSG("[0x%x] wrong inline_xattr_size:%u",
> nid, inline_size);
> if (c.fix_on) {
> @@ -1056,9 +1087,10 @@ check_next:
> }
> ofs = get_extra_isize(node_blk);
>
> - if ((node_blk->i.i_flags & cpu_to_le32(F2FS_CASEFOLD_FL)) &&
> - (!S_ISDIR(le16_to_cpu(node_blk->i.i_mode)) ||
> - !(c.feature & F2FS_FEATURE_CASEFOLD))) {
> + if (time_to_inject(FAULT_INODE) ||
> + ((node_blk->i.i_flags & cpu_to_le32(F2FS_CASEFOLD_FL)) &&
> + (!S_ISDIR(le16_to_cpu(node_blk->i.i_mode)) ||
> + !(c.feature & F2FS_FEATURE_CASEFOLD)))) {
> ASSERT_MSG("[0x%x] unexpected casefold flag", nid);
> if (c.fix_on) {
> FIX_MSG("ino[0x%x] clear casefold flag", nid);
> @@ -1077,7 +1109,8 @@ check_next:
> qf_szchk_type[cur_qtype] = QF_SZCHK_INLINE;
> block_t blkaddr = le32_to_cpu(node_blk->i.i_addr[ofs]);
>
> - if (blkaddr != NULL_ADDR) {
> + if (time_to_inject(FAULT_INODE) ||
> + (blkaddr != NULL_ADDR)) {
> ASSERT_MSG("[0x%x] wrong inline reserve blkaddr:%u",
> nid, blkaddr);
> if (c.fix_on) {
> @@ -1088,7 +1121,8 @@ check_next:
> need_fix = 1;
> }
> }
> - if (i_size > inline_size) {
> + if (time_to_inject(FAULT_INODE) ||
> + (i_size > inline_size)) {
> ASSERT_MSG("[0x%x] wrong inline size:%lu",
> nid, (unsigned long)i_size);
> if (c.fix_on) {
> @@ -1118,7 +1152,7 @@ check_next:
> block_t blkaddr = le32_to_cpu(node_blk->i.i_addr[ofs]);
>
> DBG(3, "ino[0x%x] has inline dentry!\n", nid);
> - if (blkaddr != 0) {
> + if (time_to_inject(FAULT_INODE) || (blkaddr != 0)) {
> ASSERT_MSG("[0x%x] wrong inline reserve blkaddr:%u",
> nid, blkaddr);
> if (c.fix_on) {
> @@ -1728,6 +1762,9 @@ static int f2fs_check_hash_code(int encoding, int casefolded,
> struct f2fs_dir_entry *dentry,
> const unsigned char *name, u32 len, int enc_name)
> {
> + if (time_to_inject(FAULT_DENTRY))
Ditto,
> + return 1;
> +
> /* Casefolded Encrypted names require a key to compute siphash */
> if (enc_name && casefolded)
> return 0;
> @@ -1799,7 +1836,8 @@ static int __chk_dots_dentries(struct f2fs_sb_info *sbi,
> int fixed = 0;
>
> if ((name[0] == '.' && len == 1)) {
> - if (le32_to_cpu(dentry->ino) != child->p_ino) {
> + if (time_to_inject(FAULT_DENTRY) ||
> + (le32_to_cpu(dentry->ino) != child->p_ino)) {
> ASSERT_MSG("Bad inode number[0x%x] for '.', parent_ino is [0x%x]\n",
> le32_to_cpu(dentry->ino), child->p_ino);
> dentry->ino = cpu_to_le32(child->p_ino);
> @@ -1809,13 +1847,16 @@ static int __chk_dots_dentries(struct f2fs_sb_info *sbi,
>
> if (name[0] == '.' && name[1] == '.' && len == 2) {
> if (child->p_ino == F2FS_ROOT_INO(sbi)) {
> - if (le32_to_cpu(dentry->ino) != F2FS_ROOT_INO(sbi)) {
> + if (time_to_inject(FAULT_DENTRY) ||
> + (le32_to_cpu(dentry->ino) !=
> + F2FS_ROOT_INO(sbi))) {
> ASSERT_MSG("Bad inode number[0x%x] for '..'\n",
> le32_to_cpu(dentry->ino));
> dentry->ino = cpu_to_le32(F2FS_ROOT_INO(sbi));
> fixed = 1;
> }
> - } else if (le32_to_cpu(dentry->ino) != child->pp_ino) {
> + } else if (time_to_inject(FAULT_DENTRY) ||
> + (le32_to_cpu(dentry->ino) != child->pp_ino)) {
> ASSERT_MSG("Bad inode number[0x%x] for '..', parent parent ino is [0x%x]\n",
> le32_to_cpu(dentry->ino), child->pp_ino);
> dentry->ino = cpu_to_le32(child->pp_ino);
> @@ -1826,7 +1867,7 @@ static int __chk_dots_dentries(struct f2fs_sb_info *sbi,
> if (f2fs_check_hash_code(get_encoding(sbi), casefolded, dentry, name, len, enc_name))
> fixed = 1;
>
> - if (name[len] != '\0') {
> + if (time_to_inject(FAULT_DENTRY) || (name[len] != '\0')) {
> ASSERT_MSG("'.' is not NULL terminated\n");
> name[len] = '\0';
> memcpy(*filename, name, len);
> @@ -1889,7 +1930,8 @@ static int __chk_dentries(struct f2fs_sb_info *sbi, int casefolded,
> i++;
> continue;
> }
> - if (!IS_VALID_NID(sbi, le32_to_cpu(dentry[i].ino))) {
> + if (time_to_inject(FAULT_DENTRY) ||
> + !IS_VALID_NID(sbi, le32_to_cpu(dentry[i].ino))) {
> ASSERT_MSG("Bad dentry 0x%x with invalid NID/ino 0x%x",
> i, le32_to_cpu(dentry[i].ino));
> if (c.fix_on) {
> @@ -1903,7 +1945,9 @@ static int __chk_dentries(struct f2fs_sb_info *sbi, int casefolded,
> }
>
> ftype = dentry[i].file_type;
> - if ((ftype <= F2FS_FT_UNKNOWN || ftype > F2FS_FT_LAST_FILE_TYPE)) {
> + if (time_to_inject(FAULT_DENTRY) ||
> + (ftype <= F2FS_FT_UNKNOWN ||
> + ftype > F2FS_FT_LAST_FILE_TYPE)) {
> ASSERT_MSG("Bad dentry 0x%x with unexpected ftype 0x%x",
> le32_to_cpu(dentry[i].ino), ftype);
> if (c.fix_on) {
> @@ -1918,7 +1962,8 @@ static int __chk_dentries(struct f2fs_sb_info *sbi, int casefolded,
>
> name_len = le16_to_cpu(dentry[i].name_len);
>
> - if (name_len == 0 || name_len > F2FS_NAME_LEN) {
> + if (time_to_inject(FAULT_DENTRY) ||
> + (name_len == 0 || name_len > F2FS_NAME_LEN)) {
> ASSERT_MSG("Bad dentry 0x%x with invalid name_len", i);
> if (c.fix_on) {
> FIX_MSG("Clear bad dentry 0x%x", i);
> @@ -2153,6 +2198,9 @@ int fsck_chk_data_blk(struct f2fs_sb_info *sbi, struct f2fs_inode *inode,
> return 0;
> }
>
> + if (time_to_inject(FAULT_DATA))
Ditto,
> + return -EINVAL;
> +
> if (!f2fs_is_valid_blkaddr(sbi, blk_addr, DATA_GENERIC)) {
> ASSERT_MSG("blkaddress is not valid. [0x%x]", blk_addr);
> return -EINVAL;
> @@ -3540,6 +3588,19 @@ int fsck_chk_curseg_info(struct f2fs_sb_info *sbi)
> return ret;
> }
>
> +void print_fault_cnt(struct f2fs_fault_info *ffi)
> +{
> + int i;
> +
> + printf("[Fault injection result]\n");
> + for (i = 0; i < FAULT_MAX; i++) {
> + printf("%s: %u", f2fs_fault_name[i], ffi->fault_cnt[i]);
> + if (i < FAULT_MAX - 1)
> + printf(", ");
> + }
> + printf("\n");
> +}
> +
> int fsck_verify(struct f2fs_sb_info *sbi)
> {
> unsigned int i = 0;
> @@ -3548,12 +3609,16 @@ int fsck_verify(struct f2fs_sb_info *sbi)
> u32 nr_unref_nid = 0;
> struct f2fs_fsck *fsck = F2FS_FSCK(sbi);
> struct hard_link_node *node = NULL;
> + struct f2fs_fault_info *ffi = &c.fault_info;
> bool verify_failed = false;
> uint64_t max_blks, data_secs, node_secs, free_blks;
>
> if (c.show_file_map)
> return 0;
>
> + if (ffi->inject_rate)
> + print_fault_cnt(ffi);
> +
> printf("\n");
>
> if (c.zoned_model == F2FS_ZONED_HM) {
> diff --git a/fsck/main.c b/fsck/main.c
> index 47ba6c9..29792d8 100644
> --- a/fsck/main.c
> +++ b/fsck/main.c
> @@ -91,6 +91,8 @@ void fsck_usage()
> MSG(0, " --no-kernel-check skips detecting kernel change\n");
> MSG(0, " --kernel-check checks kernel change\n");
> MSG(0, " --debug-cache to debug cache when -c is used\n");
> + MSG(0, " --fault_injection=%%d to enable fault injection with specified injection rate\n");
> + MSG(0, " --fault_type=%%d to configure enabled fault injection type\n");
> exit(1);
> }
>
> @@ -263,6 +265,8 @@ void f2fs_parse_options(int argc, char *argv[])
> {"no-kernel-check", no_argument, 0, 2},
> {"kernel-check", no_argument, 0, 3},
> {"debug-cache", no_argument, 0, 4},
> + {"fault_injection", required_argument, 0, 5},
> + {"fault_type", required_argument, 0, 6},
> {0, 0, 0, 0}
> };
>
> @@ -287,6 +291,24 @@ void f2fs_parse_options(int argc, char *argv[])
> case 4:
> c.cache_config.dbg_en = true;
> break;
> + case 5:
> + val = atoi(optarg);
> + if ((unsigned int)val <= 1) {
> + MSG(0, "\tError: injection rate must be larger "
> + "than 1: %d\n", val);
> + fsck_usage();
> + }
> + c.fault_info.inject_rate = val;
> + c.fault_info.inject_type = F2FS_ALL_FAULT_TYPE;
> + break;
> + case 6:
> + val = atoi(optarg);
> + if (val >= (1UL << (FAULT_MAX))) {
> + MSG(0, "\tError: Invalid inject type: %x\n", val);
> + fsck_usage();
> + }
> + c.fault_info.inject_type = val;
> + break;
> case 'a':
> c.auto_fix = 1;
> MSG(0, "Info: Automatic fix mode enabled.\n");
> diff --git a/fsck/mkquota.c b/fsck/mkquota.c
> index 2451b58..eb63fc9 100644
> --- a/fsck/mkquota.c
> +++ b/fsck/mkquota.c
> @@ -372,6 +372,9 @@ errcode_t quota_compare_and_update(struct f2fs_sb_info *sbi,
> dict_t *dict = qctx->quota_dict[qtype];
> errcode_t err = 0;
>
> + if (time_to_inject(FAULT_QUOTA))
Ditto,
> + return -EINVAL;
> +
> if (!dict)
> goto out;
>
> diff --git a/include/f2fs_fs.h b/include/f2fs_fs.h
> index bb40adc..99bb3ed 100644
> --- a/include/f2fs_fs.h
> +++ b/include/f2fs_fs.h
> @@ -29,6 +29,7 @@
> #include <string.h>
> #include <time.h>
> #include <stdbool.h>
> +#include <limits.h>
>
> #ifdef HAVE_CONFIG_H
> #include <config.h>
> @@ -1476,6 +1477,34 @@ enum {
> F2FS_FEATURE_NAT_BITS = 0x0001,
> };
>
> +/* Fault inject control */
> +enum {
> + FAULT_SEG_TYPE,
> + FAULT_SUM_TYPE,
> + FAULT_SUM_ENT,
> + FAULT_NAT,
> + FAULT_NODE,
> + FAULT_XATTR_ENT,
> + FAULT_COMPR,
> + FAULT_INODE,
> + FAULT_DENTRY,
> + FAULT_DATA,
> + FAULT_QUOTA,
> + FAULT_MAX
> +};
> +
> +#define F2FS_ALL_FAULT_TYPE ((1UL << (FAULT_MAX)) - 1)
> +
> +struct f2fs_fault_info {
> + int inject_ops;
> + int inject_rate;
> + unsigned int inject_type;
> + unsigned int fault_cnt[FAULT_MAX];
> +};
> +
> +extern const char *f2fs_fault_name[FAULT_MAX];
> +#define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1UL << (type)))
> +
> struct f2fs_configuration {
> uint32_t conf_reserved_sections;
> uint32_t reserved_segments;
> @@ -1604,6 +1633,9 @@ struct f2fs_configuration {
> struct f2fs_journal nat_jnl;
> char nat_bytes[F2FS_MAX_BLKSIZE];
> };
> +
> + /* Fault injection control */
> + struct f2fs_fault_info fault_info;
> };
>
> extern int utf8_to_utf16(char *, const char *, size_t, size_t);
> @@ -2131,4 +2163,30 @@ static inline void check_block_struct_sizes(void)
> + NR_DENTRY_IN_BLOCK * F2FS_SLOT_LEN * sizeof(u8) == F2FS_BLKSIZE);
> }
>
> +/* Fault inject control */
> +#define time_to_inject(type) __time_to_inject(type, __func__, \
> + __builtin_return_address(0))
> +static inline bool __time_to_inject(int type, const char *func,
> + const char *parent_func)
> +{
> + struct f2fs_fault_info *ffi = &c.fault_info;
> +
> + if (!ffi->inject_rate)
> + return false;
> +
> + if (!IS_FAULT_SET(ffi, type))
> + return false;
> +
> + ffi->inject_ops++;
> + if (ffi->inject_ops >= ffi->inject_rate) {
> + ffi->inject_ops = 0;
> + if (ffi->fault_cnt[type] != UINT_MAX)
> + ffi->fault_cnt[type]++;
> + MSG(0, "inject %s in %s of %p\n",
> + f2fs_fault_name[type], func, parent_func);
> + return true;
> + }
> + return false;
> +}
> +
> #endif /*__F2FS_FS_H */
> diff --git a/man/fsck.f2fs.8 b/man/fsck.f2fs.8
> index e39a846..8d9b0d9 100644
> --- a/man/fsck.f2fs.8
> +++ b/man/fsck.f2fs.8
> @@ -67,6 +67,42 @@ Enable to show every directory entries in the partition.
> Specify the level of debugging options.
> The default number is 0, which shows basic debugging messages.
> .TP
> +.BI \-\-fault_injection=%d " enable fault injection"
> +Enable fault injection in all supported types with specified injection rate.
> +.TP
> +.BI \-\-fault_type=%d " configure fault injection type"
> +Support configuring fault injection type, should be enabled with
> +fault_injection option, fault type value is shown below, it supports
> +single or combined type.
> +.br
> +=========================== ===========
> +.br
> +Type_Name Type_Value
> +.br
> +=========================== ===========
> +.br
> +FAULT_SEG_TYPE 0x00000001
> +.br
> +FAULT_SUM_TYPE 0x00000002
> +.br
> +FAULT_SUM_ENT 0x00000004
> +.br
> +FAULT_NAT 0x00000008
> +.br
> +FAULT_NODE 0x00000010
> +.br
> +FAULT_XATTR_ENT 0x00000020
> +.br
> +FAULT_COMPR 0x00000040
> +.br
> +FAULT_INODE 0x00000080
> +.br
> +FAULT_DENTRY 0x00000100
> +.br
> +FAULT_DATA 0x00000200
> +.br
> +FAULT_QUOTA 0x00000400
> +.TP
> .SH AUTHOR
> Initial checking code was written by Byoung Geun Kim <bgbg.kim@...sung.com>.
> Jaegeuk Kim <jaegeuk@...nel.org> reworked most parts of the codes to support
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