commit 73faec4d99358b79815866dd660ae2f9f6f9110a
author Jaegeuk Kim <jaegeuk@kernel.org> Fri Apr 29 15:34:32 2016 -0700
committer Jaegeuk Kim <jaegeuk@kernel.org> Sat May 07 10:32:22 2016 -0700
tree 3127aca2024ac6e03fe8d2f99f27bf36a2996bd9
parent 300e129c15f0ed2f94482900a4cb65b28eb09d94

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>

fs/f2fs/super.c

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 90d4b86..2234879 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -39,6 +39,10 @@
 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 @@
 	Opt_noextent_cache,
 	Opt_noinline_data,
 	Opt_data_flush,
+	Opt_fault_injection,
 	Opt_err,
 };
 
@@ -93,6 +98,7 @@
 	{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 @@
 	char *p, *name;
 	int arg = 0;
 
+#ifdef CONFIG_F2FS_FAULT_INJECTION
+	f2fs_fault_rate = 0;
+#endif
 	if (!options)
 		return 0;
 
@@ -433,6 +442,16 @@
 		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",