diff options
| -rw-r--r-- | drivers/staging/erofs/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/staging/erofs/inode.c | 3 | ||||
| -rw-r--r-- | drivers/staging/erofs/internal.h | 57 | ||||
| -rw-r--r-- | drivers/staging/erofs/super.c | 38 |
4 files changed, 103 insertions, 1 deletions
diff --git a/drivers/staging/erofs/Kconfig b/drivers/staging/erofs/Kconfig index 1a5ec1bb5cda..edda055b3c64 100644 --- a/drivers/staging/erofs/Kconfig +++ b/drivers/staging/erofs/Kconfig @@ -71,3 +71,9 @@ config EROFS_FS_USE_VM_MAP_RAM If you don't know what these are, say N. +config EROFS_FAULT_INJECTION + bool "EROFS fault injection facility" + depends on EROFS_FS + help + Test EROFS to inject faults such as ENOMEM, EIO, and so on. + If unsure, say N. diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c index c01181153d90..a6d3e129708e 100644 --- a/drivers/staging/erofs/inode.c +++ b/drivers/staging/erofs/inode.c @@ -113,6 +113,7 @@ static int read_inode(struct inode *inode, void *data) static int fill_inline_data(struct inode *inode, void *data, unsigned m_pofs) { struct erofs_vnode *vi = EROFS_V(inode); + struct erofs_sb_info *sbi = EROFS_I_SB(inode); int mode = vi->data_mapping_mode; DBG_BUGON(mode >= EROFS_INODE_LAYOUT_MAX); @@ -123,7 +124,7 @@ static int fill_inline_data(struct inode *inode, void *data, unsigned m_pofs) /* fast symlink (following ext4) */ if (S_ISLNK(inode->i_mode) && inode->i_size < PAGE_SIZE) { - char *lnk = kmalloc(inode->i_size + 1, GFP_KERNEL); + char *lnk = erofs_kmalloc(sbi, inode->i_size + 1, GFP_KERNEL); if (unlikely(lnk == NULL)) return -ENOMEM; diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h index 5862705c5cae..ca224866282f 100644 --- a/drivers/staging/erofs/internal.h +++ b/drivers/staging/erofs/internal.h @@ -42,6 +42,22 @@ #define DBG_BUGON(...) ((void)0) #endif +#ifdef CONFIG_EROFS_FAULT_INJECTION +enum { + FAULT_KMALLOC, + FAULT_MAX, +}; + +extern char *erofs_fault_name[FAULT_MAX]; +#define IS_FAULT_SET(fi, type) ((fi)->inject_type & (1 << (type))) + +struct erofs_fault_info { + atomic_t inject_ops; + unsigned int inject_rate; + unsigned int inject_type; +}; +#endif + /* EROFS_SUPER_MAGIC_V1 to represent the whole file system */ #define EROFS_SUPER_MAGIC EROFS_SUPER_MAGIC_V1 @@ -70,14 +86,55 @@ struct erofs_sb_info { char *dev_name; unsigned int mount_opt; + +#ifdef CONFIG_EROFS_FAULT_INJECTION + struct erofs_fault_info fault_info; /* For fault injection */ +#endif }; +#ifdef CONFIG_EROFS_FAULT_INJECTION +#define erofs_show_injection_info(type) \ + infoln("inject %s in %s of %pS", erofs_fault_name[type], \ + __func__, __builtin_return_address(0)) + +static inline bool time_to_inject(struct erofs_sb_info *sbi, int type) +{ + struct erofs_fault_info *ffi = &sbi->fault_info; + + if (!ffi->inject_rate) + return false; + + if (!IS_FAULT_SET(ffi, type)) + return false; + + atomic_inc(&ffi->inject_ops); + if (atomic_read(&ffi->inject_ops) >= ffi->inject_rate) { + atomic_set(&ffi->inject_ops, 0); + return true; + } + return false; +} +#endif + +static inline void *erofs_kmalloc(struct erofs_sb_info *sbi, + size_t size, gfp_t flags) +{ +#ifdef CONFIG_EROFS_FAULT_INJECTION + if (time_to_inject(sbi, FAULT_KMALLOC)) { + erofs_show_injection_info(FAULT_KMALLOC); + return NULL; + } +#endif + return kmalloc(size, flags); +} + #define EROFS_SB(sb) ((struct erofs_sb_info *)(sb)->s_fs_info) #define EROFS_I_SB(inode) ((struct erofs_sb_info *)(inode)->i_sb->s_fs_info) /* Mount flags set via mount options or defaults */ #define EROFS_MOUNT_XATTR_USER 0x00000010 #define EROFS_MOUNT_POSIX_ACL 0x00000020 +#define EROFS_MOUNT_FAULT_INJECTION 0x00000040 #define clear_opt(sbi, option) ((sbi)->mount_opt &= ~EROFS_MOUNT_##option) #define set_opt(sbi, option) ((sbi)->mount_opt |= EROFS_MOUNT_##option) diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c index 4a8a2664c80b..701425fed049 100644 --- a/drivers/staging/erofs/super.c +++ b/drivers/staging/erofs/super.c @@ -129,6 +129,26 @@ out: return ret; } +#ifdef CONFIG_EROFS_FAULT_INJECTION +char *erofs_fault_name[FAULT_MAX] = { + [FAULT_KMALLOC] = "kmalloc", +}; + +static void erofs_build_fault_attr(struct erofs_sb_info *sbi, + unsigned int rate) +{ + struct erofs_fault_info *ffi = &sbi->fault_info; + + if (rate) { + atomic_set(&ffi->inject_ops, 0); + ffi->inject_rate = rate; + ffi->inject_type = (1 << FAULT_MAX) - 1; + } else { + memset(ffi, 0, sizeof(struct erofs_fault_info)); + } +} +#endif + static void default_options(struct erofs_sb_info *sbi) { #ifdef CONFIG_EROFS_FS_XATTR @@ -145,6 +165,7 @@ enum { Opt_nouser_xattr, Opt_acl, Opt_noacl, + Opt_fault_injection, Opt_err }; @@ -153,6 +174,7 @@ static match_table_t erofs_tokens = { {Opt_nouser_xattr, "nouser_xattr"}, {Opt_acl, "acl"}, {Opt_noacl, "noacl"}, + {Opt_fault_injection, "fault_injection=%u"}, {Opt_err, NULL} }; @@ -160,6 +182,7 @@ static int parse_options(struct super_block *sb, char *options) { substring_t args[MAX_OPT_ARGS]; char *p; + int arg = 0; if (!options) return 0; @@ -204,6 +227,16 @@ static int parse_options(struct super_block *sb, char *options) infoln("noacl options not supported"); break; #endif + case Opt_fault_injection: + if (args->from && match_int(args, &arg)) + return -EINVAL; +#ifdef CONFIG_EROFS_FAULT_INJECTION + erofs_build_fault_attr(EROFS_SB(sb), arg); + set_opt(EROFS_SB(sb), FAULT_INJECTION); +#else + infoln("FAULT_INJECTION was not selected"); +#endif + break; default: errln("Unrecognized mount option \"%s\" " "or missing value", p); @@ -453,6 +486,11 @@ static int erofs_show_options(struct seq_file *seq, struct dentry *root) else seq_puts(seq, ",noacl"); #endif +#ifdef CONFIG_EROFS_FAULT_INJECTION + if (test_opt(sbi, FAULT_INJECTION)) + seq_printf(seq, ",fault_injection=%u", + sbi->fault_info.inject_rate); +#endif return 0; } |