f2fs: support fault injection to f2fs_trylock_op()

f2fs: support fault injection for f2fs_trylock_op()

This patch supports to inject fault into f2fs_trylock_op().

Usage:
a) echo 65536 > /sys/fs/f2fs/<dev>/inject_type or
b) mount -o fault_type=65536 <dev> <mountpoint>

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index d7b8469..4a2426f 100644 (file)
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -198,6 +198,7 @@ fault_type=%d                Support configuring fault injection type, should be
                         FAULT_WRITE_IO           0x000004000
                         FAULT_SLAB_ALLOC         0x000008000
                         FAULT_DQUOT_INIT         0x000010000
+                        FAULT_LOCK_OP            0x000020000
                         ===================      ===========
 mode=%s                         Control block allocation mode which supports "adaptive"
                         and "lfs". In "lfs" mode, there should be no random

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a9ed2fd..8601d5e 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -56,6 +56,7 @@ enum {
        FAULT_WRITE_IO,
        FAULT_SLAB_ALLOC,
        FAULT_DQUOT_INIT,
+       FAULT_LOCK_OP,
        FAULT_MAX,
 };
 
@@ -2095,6 +2096,10 @@ static inline void f2fs_lock_op(struct f2fs_sb_info *sbi)
 
 static inline int f2fs_trylock_op(struct f2fs_sb_info *sbi)
 {
+       if (time_to_inject(sbi, FAULT_LOCK_OP)) {
+               f2fs_show_injection_info(sbi, FAULT_LOCK_OP);
+               return 0;
+       }
        return down_read_trylock(&sbi->cp_rwsem);
 }
 

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 9acd76e..ca5783f 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -59,6 +59,7 @@ const char *f2fs_fault_name[FAULT_MAX] = {
        [FAULT_WRITE_IO]        = "write IO error",
        [FAULT_SLAB_ALLOC]      = "slab alloc",
        [FAULT_DQUOT_INIT]      = "dquot initialize",
+       [FAULT_LOCK_OP]         = "lock_op",
 };
 
 void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,