On 2022/5/25 15:51, Ritesh Harjani wrote:
On 22/05/25 09:29AM, Ye Bin wrote:
We got issue as follows:
[home]# mount /dev/sda test
EXT4-fs (sda): warning: mounting fs with errors, running e2fsck is recommended
[home]# dmesg
EXT4-fs (sda): warning: mounting fs with errors, running e2fsck is recommended
EXT4-fs (sda): Errors on filesystem, clearing orphan list.
EXT4-fs (sda): recovery complete
EXT4-fs (sda): mounted filesystem with ordered data mode. Quota mode: none.
[home]# debugfs /dev/sda
debugfs 1.46.5 (30-Dec-2021)
Checksum errors in superblock! Retrying...
Reason is ext4_orphan_cleanup will reset ‘s_last_orphan’ but not update
super block checksum.
To solve above issue, defer update super block checksum after ext4_orphan_cleanup.
I agree with the analysis. However after [1], I think all updates to superblock
(including checksum computation) should be done within buffer lock.
(lock_buffer(), unlock_buffer()).
[1]: https://lore.kernel.org/all/20201216101844.22917-4-jack@xxxxxxx/
With lock changes added, feel free to add -
Reviewed-by: Ritesh Harjani <ritesh.list@xxxxxxxxx>
Thanks for your reply.
I think there should be no concurrent modification at this time.
So there's no need to hold buffer lock.
Am I missing something?
Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx>
---
fs/ext4/super.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f9a3ad683b4a..c47204029429 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5300,14 +5300,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
GFP_KERNEL);
}
- /*
- * Update the checksum after updating free space/inode
- * counters. Otherwise the superblock can have an incorrect
- * checksum in the buffer cache until it is written out and
- * e2fsprogs programs trying to open a file system immediately
- * after it is mounted can fail.
- */
- ext4_superblock_csum_set(sb);
if (!err)
err = percpu_counter_init(&sbi->s_dirs_counter,
ext4_count_dirs(sb), GFP_KERNEL);
@@ -5365,6 +5357,14 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
ext4_orphan_cleanup(sb, es);
EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
+ /*
+ * Update the checksum after updating free space/inode counters and
+ * ext4_orphan_cleanup. Otherwise the superblock can have an incorrect
+ * checksum in the buffer cache until it is written out and
+ * e2fsprogs programs trying to open a file system immediately
+ * after it is mounted can fail.
+ */
+ ext4_superblock_csum_set(sb);
if (needs_recovery) {
ext4_msg(sb, KERN_INFO, "recovery complete");
err = ext4_mark_recovery_complete(sb, es);
--
2.31.1
.
