diff options
| -rw-r--r-- | fs/btrfs/disk-io.c | 2 | ||||
| -rw-r--r-- | fs/btrfs/free-space-cache.c | 2 | ||||
| -rw-r--r-- | include/asm-generic/error-injection.h | 23 | ||||
| -rw-r--r-- | include/asm-generic/vmlinux.lds.h | 2 | ||||
| -rw-r--r-- | include/linux/error-injection.h | 6 | ||||
| -rw-r--r-- | include/linux/module.h | 3 | ||||
| -rw-r--r-- | lib/error-inject.c | 43 |
7 files changed, 66 insertions, 15 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 9798e21ebe9d..83e2349e1362 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3124,7 +3124,7 @@ recovery_tree_root: goto fail_block_groups; goto retry_root_backup; } -ALLOW_ERROR_INJECTION(open_ctree); +ALLOW_ERROR_INJECTION(open_ctree, ERRNO); static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) { diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index ef847699031a..586bb06472bb 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -333,7 +333,7 @@ static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode, return 0; } -ALLOW_ERROR_INJECTION(io_ctl_init); +ALLOW_ERROR_INJECTION(io_ctl_init, ERRNO); static void io_ctl_free(struct btrfs_io_ctl *io_ctl) { diff --git a/include/asm-generic/error-injection.h b/include/asm-generic/error-injection.h index 08352c9d9f97..296c65442f00 100644 --- a/include/asm-generic/error-injection.h +++ b/include/asm-generic/error-injection.h @@ -3,17 +3,32 @@ #define _ASM_GENERIC_ERROR_INJECTION_H #if defined(__KERNEL__) && !defined(__ASSEMBLY__) +enum { + EI_ETYPE_NONE, /* Dummy value for undefined case */ + EI_ETYPE_NULL, /* Return NULL if failure */ + EI_ETYPE_ERRNO, /* Return -ERRNO if failure */ + EI_ETYPE_ERRNO_NULL, /* Return -ERRNO or NULL if failure */ +}; + +struct error_injection_entry { + unsigned long addr; + int etype; +}; + #ifdef CONFIG_FUNCTION_ERROR_INJECTION /* * Whitelist ganerating macro. Specify functions which can be * error-injectable using this macro. */ -#define ALLOW_ERROR_INJECTION(fname) \ -static unsigned long __used \ +#define ALLOW_ERROR_INJECTION(fname, _etype) \ +static struct error_injection_entry __used \ __attribute__((__section__("_error_injection_whitelist"))) \ - _eil_addr_##fname = (unsigned long)fname; + _eil_addr_##fname = { \ + .addr = (unsigned long)fname, \ + .etype = EI_ETYPE_##_etype, \ + }; #else -#define ALLOW_ERROR_INJECTION(fname) +#define ALLOW_ERROR_INJECTION(fname, _etype) #endif #endif diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index f2068cca5206..ebe544e048cd 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -137,7 +137,7 @@ #endif #ifdef CONFIG_FUNCTION_ERROR_INJECTION -#define ERROR_INJECT_WHITELIST() . = ALIGN(8); \ +#define ERROR_INJECT_WHITELIST() STRUCT_ALIGN(); \ VMLINUX_SYMBOL(__start_error_injection_whitelist) = .;\ KEEP(*(_error_injection_whitelist)) \ VMLINUX_SYMBOL(__stop_error_injection_whitelist) = .; diff --git a/include/linux/error-injection.h b/include/linux/error-injection.h index 130a67c50dac..280c61ecbf20 100644 --- a/include/linux/error-injection.h +++ b/include/linux/error-injection.h @@ -7,6 +7,7 @@ #include <asm/error-injection.h> extern bool within_error_injection_list(unsigned long addr); +extern int get_injectable_error_type(unsigned long addr); #else /* !CONFIG_FUNCTION_ERROR_INJECTION */ @@ -16,6 +17,11 @@ static inline bool within_error_injection_list(unsigned long addr) return false; } +static inline int get_injectable_error_type(unsigned long addr) +{ + return EI_ETYPE_NONE; +} + #endif #endif /* _LINUX_ERROR_INJECTION_H */ diff --git a/include/linux/module.h b/include/linux/module.h index 792e51d83bda..9642d3116718 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -19,6 +19,7 @@ #include <linux/jump_label.h> #include <linux/export.h> #include <linux/rbtree_latch.h> +#include <linux/error-injection.h> #include <linux/percpu.h> #include <asm/module.h> @@ -477,8 +478,8 @@ struct module { #endif #ifdef CONFIG_FUNCTION_ERROR_INJECTION + struct error_injection_entry *ei_funcs; unsigned int num_ei_funcs; - unsigned long *ei_funcs; #endif } ____cacheline_aligned __randomize_layout; #ifndef MODULE_ARCH_INIT diff --git a/lib/error-inject.c b/lib/error-inject.c index bccadcf3c981..c0d4600f4896 100644 --- a/lib/error-inject.c +++ b/lib/error-inject.c @@ -16,6 +16,7 @@ struct ei_entry { struct list_head list; unsigned long start_addr; unsigned long end_addr; + int etype; void *priv; }; @@ -35,6 +36,17 @@ bool within_error_injection_list(unsigned long addr) return ret; } +int get_injectable_error_type(unsigned long addr) +{ + struct ei_entry *ent; + + list_for_each_entry(ent, &error_injection_list, list) { + if (addr >= ent->start_addr && addr < ent->end_addr) + return ent->etype; + } + return EI_ETYPE_NONE; +} + /* * Lookup and populate the error_injection_list. * @@ -42,16 +54,17 @@ bool within_error_injection_list(unsigned long addr) * bpf_error_injection, so we need to populate the list of the symbols that have * been marked as safe for overriding. */ -static void populate_error_injection_list(unsigned long *start, - unsigned long *end, void *priv) +static void populate_error_injection_list(struct error_injection_entry *start, + struct error_injection_entry *end, + void *priv) { - unsigned long *iter; + struct error_injection_entry *iter; struct ei_entry *ent; unsigned long entry, offset = 0, size = 0; mutex_lock(&ei_mutex); for (iter = start; iter < end; iter++) { - entry = arch_deref_entry_point((void *)*iter); + entry = arch_deref_entry_point((void *)iter->addr); if (!kernel_text_address(entry) || !kallsyms_lookup_size_offset(entry, &size, &offset)) { @@ -65,6 +78,7 @@ static void populate_error_injection_list(unsigned long *start, break; ent->start_addr = entry; ent->end_addr = entry + size; + ent->etype = iter->etype; ent->priv = priv; INIT_LIST_HEAD(&ent->list); list_add_tail(&ent->list, &error_injection_list); @@ -73,8 +87,8 @@ static void populate_error_injection_list(unsigned long *start, } /* Markers of the _error_inject_whitelist section */ -extern unsigned long __start_error_injection_whitelist[]; -extern unsigned long __stop_error_injection_whitelist[]; +extern struct error_injection_entry __start_error_injection_whitelist[]; +extern struct error_injection_entry __stop_error_injection_whitelist[]; static void __init populate_kernel_ei_list(void) { @@ -157,11 +171,26 @@ static void *ei_seq_next(struct seq_file *m, void *v, loff_t *pos) return seq_list_next(v, &error_injection_list, pos); } +static const char *error_type_string(int etype) +{ + switch (etype) { + case EI_ETYPE_NULL: + return "NULL"; + case EI_ETYPE_ERRNO: + return "ERRNO"; + case EI_ETYPE_ERRNO_NULL: + return "ERRNO_NULL"; + default: + return "(unknown)"; + } +} + static int ei_seq_show(struct seq_file *m, void *v) { struct ei_entry *ent = list_entry(v, struct ei_entry, list); - seq_printf(m, "%pf\n", (void *)ent->start_addr); + seq_printf(m, "%pf\t%s\n", (void *)ent->start_addr, + error_type_string(ent->etype)); return 0; } |