Btrfs: SB read failure should return EIO for __bread failure
This will return EIO when __bread() fails to read SB,
instead of EINVAL.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7673473..357d9f9 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2653,8 +2653,8 @@
* Read super block and check the signature bytes only
*/
bh = btrfs_read_dev_super(fs_devices->latest_bdev);
- if (!bh) {
- err = -EINVAL;
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
goto fail_alloc;
}
@@ -3196,6 +3196,7 @@
int i;
u64 transid = 0;
u64 bytenr;
+ int ret = -EINVAL;
/* we would like to check all the supers, but that would make
* a btrfs mount succeed after a mkfs from a different FS.
@@ -3209,13 +3210,20 @@
break;
bh = __bread(bdev, bytenr / 4096,
BTRFS_SUPER_INFO_SIZE);
- if (!bh)
+ /*
+ * If we fail to read from the underlying devices, as of now
+ * the best option we have is to mark it EIO.
+ */
+ if (!bh) {
+ ret = -EIO;
continue;
+ }
super = (struct btrfs_super_block *)bh->b_data;
if (btrfs_super_bytenr(super) != bytenr ||
btrfs_super_magic(super) != BTRFS_MAGIC) {
brelse(bh);
+ ret = -EINVAL;
continue;
}
@@ -3227,6 +3235,10 @@
brelse(bh);
}
}
+
+ if (!latest)
+ return ERR_PTR(ret);
+
return latest;
}