There are already 2 reports about strangely corrupted super blocks,
where csum still matches but extra garbage gets slipped into super block.
The corruption would looks like:
------
superblock: bytenr=65536, device=/dev/sdc1
---------------------------------------------------------
csum_type 41700 (INVALID)
csum 0x3b252d3a [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
...
incompat_flags 0x5b22400000000169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
unknown flag: 0x5b22400000000000 )
...
------
Or
------
superblock: bytenr=65536, device=/dev/mapper/x
---------------------------------------------------------
csum_type 35355 (INVALID)
csum_size 32
csum 0xf0dbeddd [match]
bytenr 65536
flags 0x1
( WRITTEN )
magic _BHRfS_M [match]
...
incompat_flags 0x176d200000000169
( MIXED_BACKREF |
COMPRESS_LZO |
BIG_METADATA |
EXTENDED_IREF |
SKINNY_METADATA |
unknown flag: 0x176d200000000000 )
------
Obviously, csum_type and incompat_flags get some garbage, but its csum
still matches, which means kernel calculates the csum based on corrupted
super block memory.
And after manually fixing these values, the filesystem is completely
healthy without any problem exposed by btrfs check.
Although the cause is still unknown, at least detect it and prevent further
corruption.
Reported-by: Ken Swenson <flat@xxxxxxxxxxx>
Reported-by: Ben Parsons <9parsonsb@xxxxxxxxx>
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
fs/btrfs/disk-io.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b981ecc4b6f9..985695074c51 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2610,6 +2610,41 @@ static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
return __validate_super(fs_info, fs_info->super_copy, 0);
}
+/*
+ * Check the validation of super block at write time.
+ * Some checks like bytenr check will be skipped as their values will be
+ * overwritten soon.
+ * Extra checks like csum type and incompact flags will be executed here.
+ */
+static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
+ struct btrfs_super_block *sb)
+{
+ int ret;
+
+ ret = __validate_super(fs_info, sb, -1);
+ if (ret < 0)
+ goto out;
+ if (btrfs_super_csum_type(sb) != BTRFS_CSUM_TYPE_CRC32) {
+ ret = -EUCLEAN;
+ btrfs_err(fs_info, "invalid csum type, has %u want %u",
+ btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
+ goto out;
+ }
+ if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
+ ret = -EUCLEAN;
+ btrfs_err(fs_info,
+ "invalid incompact flags, has 0x%llu valid mask 0x%llu",
+ btrfs_super_incompat_flags(sb),
+ BTRFS_FEATURE_INCOMPAT_SUPP);
+ goto out;
+ }
+out:
+ if (ret < 0)
+ btrfs_err(fs_info,
+ "super block corruption detected before writing it to disk");
+ return ret;
+}
+
int open_ctree(struct super_block *sb,
struct btrfs_fs_devices *fs_devices,
char *options)
@@ -3730,6 +3765,10 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
sb = fs_info->super_for_commit;
dev_item = &sb->dev_item;
+ ret = btrfs_validate_write_super(fs_info, sb);
+ if (ret < 0)
+ return ret;
+
mutex_lock(&fs_info->fs_devices->device_list_mutex);
head = &fs_info->fs_devices->devices;
max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
--
2.17.0
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