[PATCH v2 4/4] f2fs: stop checkpoint when get a out-of-bounds segment

Zhiguo Niu
2024-02-07T02:02:14Z

There is low probability that an out-of-bounds segment will be got
on a small-capacity device. In order to prevent subsequent write requests
allocating block address from this invalid segment, which may cause
unexpected issue, stop checkpoint should be performed.

Also introduce a new stop cp reason: STOP_CP_REASON_OUTOF_RAGNE.

Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
---
fs/f2fs/segment.c | 12 ++++++++++--
include/linux/f2fs_fs.h | 1 +
2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 6772ad4..6fe2baf 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2666,7 +2666,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
if (dir == ALLOC_RIGHT) {
secno = find_first_zero_bit(free_i->free_secmap,
MAIN_SECS(sbi));
- f2fs_bug_on(sbi, secno >= MAIN_SECS(sbi));
+ if (secno >= MAIN_SECS(sbi)) {
+ f2fs_stop_checkpoint(sbi, false,
+ STOP_CP_REASON_OUTOF_RAGNE);
+ f2fs_bug_on(sbi, 1);
+ }
} else {
go_left = 1;
left_start = hint - 1;
@@ -2682,7 +2686,11 @@ static void get_new_segment(struct f2fs_sb_info *sbi,
}
left_start = find_first_zero_bit(free_i->free_secmap,
MAIN_SECS(sbi));
- f2fs_bug_on(sbi, left_start >= MAIN_SECS(sbi));
+ if (left_start >= MAIN_SECS(sbi)) {
+ f2fs_stop_checkpoint(sbi, false,
+ STOP_CP_REASON_OUTOF_RAGNE);
+ f2fs_bug_on(sbi, 1);
+ }
break;
}
secno = left_start;
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 053137a0..72c6782 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -81,6 +81,7 @@ enum stop_cp_reason {
STOP_CP_REASON_CORRUPTED_SUMMARY,
STOP_CP_REASON_UPDATE_INODE,
STOP_CP_REASON_FLUSH_FAIL,
+ STOP_CP_REASON_OUTOF_RAGNE,
STOP_CP_REASON_MAX,
};

--
1.9.1