[PATCH v2 2/2] f2fs: fix to update superblock crc in sanity_check_area_boundary()

[Chao Yu]

From: Chao Yu <chao@xxxxxxxxxx>

This patch fixes the bug reported by Sashiko:

We should update superblock crc along w/ raw_super->segment_count in
sanity_check_area_boundary() if sb_checksum feature is enabled.

Cc: stable@xxxxxxxxxx
Fixes: d440c52d3151 ("f2fs: support superblock checksum")
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
v2:
- update crc directly in sanity_check_area_boundary rather than calling
f2fs_commit_super() which will access NULL sbi->raw_super.
 fs/f2fs/super.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index b321b9cff351..37d208c6bb53 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -4084,6 +4084,12 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 		/* fix in-memory information all the time */
 		raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
 				segment0_blkaddr) >> log_blocks_per_seg);
+		if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) {
+			__u32 crc = f2fs_crc32(raw_super,
+					offsetof(struct f2fs_super_block, crc));
+
+			raw_super->crc = cpu_to_le32(crc);
+		}
 
 		if (f2fs_readonly(sb) || f2fs_hw_is_readonly(sbi)) {
 			set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
-- 
2.49.0