f2fs: add missing doc for fault injection sysfs

We supported configuring fault injection parameter via sysfs w/
below commits, however, we forgot to add doc entry, fix it.

commit 087968974fcd ("f2fs: add fault injection to sysfs")
/sys/fs/f2fs/fault_injection/fault_*

commit 1ecc0c5c50ce ("f2fs: support configuring fault injection per superblock")
/sys/fs/f2fs/<device>/fault_*

Cc: Sheng Yong <shengyong@oppo.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 9e37566..aaa379b 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -669,3 +669,42 @@ Contact:   "Ping Xiong" <xiongping1@xiaomi.com>
 Description:   When DATA SEPARATION is on, it controls the age threshold to indicate
                the data blocks as warm. By default it was initialized as 2621440 blocks
                (equals to 10GB).
+
+What:          /sys/fs/f2fs/<disk>/fault_rate
+Date:          May 2016
+Contact:       "Sheng Yong" <shengyong@oppo.com>
+Contact:       "Chao Yu" <chao@kernel.org>
+Description:   Enable fault injection in all supported types with
+               specified injection rate.
+
+What:          /sys/fs/f2fs/<disk>/fault_type
+Date:          May 2016
+Contact:       "Sheng Yong" <shengyong@oppo.com>
+Contact:       "Chao Yu" <chao@kernel.org>
+Description:   Support configuring fault injection type, should be
+               enabled with fault_injection option, fault type value
+               is shown below, it supports single or combined type.
+
+               ===================      ===========
+               Type_Name                Type_Value
+               ===================      ===========
+               FAULT_KMALLOC            0x000000001
+               FAULT_KVMALLOC           0x000000002
+               FAULT_PAGE_ALLOC         0x000000004
+               FAULT_PAGE_GET           0x000000008
+               FAULT_ALLOC_BIO          0x000000010 (obsolete)
+               FAULT_ALLOC_NID          0x000000020
+               FAULT_ORPHAN             0x000000040
+               FAULT_BLOCK              0x000000080
+               FAULT_DIR_DEPTH          0x000000100
+               FAULT_EVICT_INODE        0x000000200
+               FAULT_TRUNCATE           0x000000400
+               FAULT_READ_IO            0x000000800
+               FAULT_CHECKPOINT         0x000001000
+               FAULT_DISCARD            0x000002000
+               FAULT_WRITE_IO           0x000004000
+               FAULT_SLAB_ALLOC         0x000008000
+               FAULT_DQUOT_INIT         0x000010000
+               FAULT_LOCK_OP            0x000020000
+               FAULT_BLKADDR            0x000040000
+               ===================      ===========