[PATCH 4/4] f2fs: introduce FAULT_NO_SEGMENT

Chao Yu
2024-02-22T12:19:03Z

Use it to simulate no free segment case during block allocation.

Signed-off-by: Chao Yu <chao@kernel.org>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 1 +
Documentation/filesystems/f2fs.rst | 1 +
fs/f2fs/f2fs.h | 1 +
fs/f2fs/segment.c | 5 +++++
fs/f2fs/super.c | 1 +
5 files changed, 9 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 15044d7d4977..96b54259a02a 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -718,6 +718,7 @@ Description: Support configuring fault injection type, should be
FAULT_LOCK_OP 0x000020000
FAULT_BLKADDR_VALIDITY 0x000040000
FAULT_BLKADDR_CONSISTENCE 0x000080000
+ FAULT_NO_SEGMENT 0x000100000
=========================== ===========

What: /sys/fs/f2fs/<disk>/discard_io_aware_gran
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index 1b3b73aa3ab9..bc074b8eedbb 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -205,6 +205,7 @@ fault_type=%d Support configuring fault injection type, should be
FAULT_LOCK_OP 0x000020000
FAULT_BLKADDR_VALIDITY 0x000040000
FAULT_BLKADDR_CONSISTENCE 0x000080000
+ FAULT_NO_SEGMENT 0x000100000
=========================== ===========
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 6390c3d551cb..fdc9a4dc981d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -62,6 +62,7 @@ enum {
FAULT_LOCK_OP,
FAULT_BLKADDR_VALIDITY,
FAULT_BLKADDR_CONSISTENCE,
+ FAULT_NO_SEGMENT,
FAULT_MAX,
};

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 71f523431e87..8ad88d5d4d1d 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2653,6 +2653,11 @@ static int get_new_segment(struct f2fs_sb_info *sbi,

spin_lock(&free_i->segmap_lock);

+ if (time_to_inject(sbi, FAULT_NO_SEGMENT)) {
+ ret = -ENOSPC;
+ goto out_unlock;
+ }
+
if (!new_sec && ((*newseg + 1) % SEGS_PER_SEC(sbi))) {
segno = find_next_zero_bit(free_i->free_segmap,
GET_SEG_FROM_SEC(sbi, hint + 1), *newseg + 1);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index bb056700b459..dc4fb9a661f2 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -63,6 +63,7 @@ const char *f2fs_fault_name[FAULT_MAX] = {
[FAULT_LOCK_OP] = "lock_op",
[FAULT_BLKADDR_VALIDITY] = "invalid blkaddr",
[FAULT_BLKADDR_CONSISTENCE] = "inconsistent blkaddr",
+ [FAULT_NO_SEGMENT] = "no free segment",
};

void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,
--
2.40.1