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>
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300e129c15
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@ -94,3 +94,11 @@ config F2FS_IO_TRACE
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information and block IO patterns in the filesystem level.
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If unsure, say N.
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config F2FS_FAULT_INJECTION
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bool "F2FS fault injection facility"
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depends on F2FS_FS
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help
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Test F2FS to inject faults such as ENOMEM, ENOSPC, and so on.
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If unsure, say N.
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@ -56,6 +56,7 @@
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#define F2FS_MOUNT_EXTENT_CACHE 0x00002000
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#define F2FS_MOUNT_FORCE_FG_GC 0x00004000
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#define F2FS_MOUNT_DATA_FLUSH 0x00008000
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#define F2FS_MOUNT_FAULT_INJECTION 0x00010000
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#define clear_opt(sbi, option) (sbi->mount_opt.opt &= ~F2FS_MOUNT_##option)
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#define set_opt(sbi, option) (sbi->mount_opt.opt |= F2FS_MOUNT_##option)
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@ -39,6 +39,10 @@ static struct proc_dir_entry *f2fs_proc_root;
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static struct kmem_cache *f2fs_inode_cachep;
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static struct kset *f2fs_kset;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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u32 f2fs_fault_rate = 0;
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#endif
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/* f2fs-wide shrinker description */
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static struct shrinker f2fs_shrinker_info = {
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.scan_objects = f2fs_shrink_scan,
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@ -68,6 +72,7 @@ enum {
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Opt_noextent_cache,
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Opt_noinline_data,
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Opt_data_flush,
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Opt_fault_injection,
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Opt_err,
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};
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@ -93,6 +98,7 @@ static match_table_t f2fs_tokens = {
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{Opt_noextent_cache, "noextent_cache"},
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{Opt_noinline_data, "noinline_data"},
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{Opt_data_flush, "data_flush"},
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{Opt_fault_injection, "fault_injection=%u"},
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{Opt_err, NULL},
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};
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@ -300,6 +306,9 @@ static int parse_options(struct super_block *sb, char *options)
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char *p, *name;
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int arg = 0;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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f2fs_fault_rate = 0;
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#endif
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if (!options)
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return 0;
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@ -433,6 +442,16 @@ static int parse_options(struct super_block *sb, char *options)
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case Opt_data_flush:
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set_opt(sbi, DATA_FLUSH);
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break;
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case Opt_fault_injection:
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if (args->from && match_int(args, &arg))
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return -EINVAL;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
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f2fs_fault_rate = arg;
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#else
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f2fs_msg(sb, KERN_INFO,
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"FAULT_INJECTION was not selected");
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#endif
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break;
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default:
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f2fs_msg(sb, KERN_ERR,
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"Unrecognized mount option \"%s\" or missing value",
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