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authorJaegeuk Kim <jaegeuk@kernel.org>2016-04-29 15:34:32 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2016-05-07 10:32:22 -0700
commit73faec4d99358b79815866dd660ae2f9f6f9110a (patch)
tree3127aca2024ac6e03fe8d2f99f27bf36a2996bd9 /fs/f2fs
parent300e129c15f0ed2f94482900a4cb65b28eb09d94 (diff)
downloadlinux-73faec4d99358b79815866dd660ae2f9f6f9110a.tar.bz2
f2fs: add mount option to select fault injection ratio
This patch adds a mount option to select fault ratio. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/Kconfig8
-rw-r--r--fs/f2fs/f2fs.h1
-rw-r--r--fs/f2fs/super.c19
3 files changed, 28 insertions, 0 deletions
diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
index 1f8982a957f1..378c221d68a9 100644
--- a/fs/f2fs/Kconfig
+++ b/fs/f2fs/Kconfig
@@ -94,3 +94,11 @@ config F2FS_IO_TRACE
information and block IO patterns in the filesystem level.
If unsure, say N.
+
+config F2FS_FAULT_INJECTION
+ bool "F2FS fault injection facility"
+ depends on F2FS_FS
+ help
+ Test F2FS to inject faults such as ENOMEM, ENOSPC, and so on.
+
+ If unsure, say N.
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 879e4d77a1bc..0cf2a26388e5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -56,6 +56,7 @@
#define F2FS_MOUNT_EXTENT_CACHE 0x00002000
#define F2FS_MOUNT_FORCE_FG_GC 0x00004000
#define F2FS_MOUNT_DATA_FLUSH 0x00008000
+#define F2FS_MOUNT_FAULT_INJECTION 0x00010000
#define clear_opt(sbi, option) (sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
#define set_opt(sbi, option) (sbi->mount_opt.opt |= F2FS_MOUNT_##option)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 90d4b864590c..22348791700f 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -39,6 +39,10 @@ static struct proc_dir_entry *f2fs_proc_root;
static struct kmem_cache *f2fs_inode_cachep;
static struct kset *f2fs_kset;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+u32 f2fs_fault_rate = 0;
+#endif
+
/* f2fs-wide shrinker description */
static struct shrinker f2fs_shrinker_info = {
.scan_objects = f2fs_shrink_scan,
@@ -68,6 +72,7 @@ enum {
Opt_noextent_cache,
Opt_noinline_data,
Opt_data_flush,
+ Opt_fault_injection,
Opt_err,
};
@@ -93,6 +98,7 @@ static match_table_t f2fs_tokens = {
{Opt_noextent_cache, "noextent_cache"},
{Opt_noinline_data, "noinline_data"},
{Opt_data_flush, "data_flush"},
+ {Opt_fault_injection, "fault_injection=%u"},
{Opt_err, NULL},
};
@@ -300,6 +306,9 @@ static int parse_options(struct super_block *sb, char *options)
char *p, *name;
int arg = 0;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ f2fs_fault_rate = 0;
+#endif
if (!options)
return 0;
@@ -433,6 +442,16 @@ static int parse_options(struct super_block *sb, char *options)
case Opt_data_flush:
set_opt(sbi, DATA_FLUSH);
break;
+ case Opt_fault_injection:
+ if (args->from && match_int(args, &arg))
+ return -EINVAL;
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+ f2fs_fault_rate = arg;
+#else
+ f2fs_msg(sb, KERN_INFO,
+ "FAULT_INJECTION was not selected");
+#endif
+ break;
default:
f2fs_msg(sb, KERN_ERR,
"Unrecognized mount option \"%s\" or missing value",