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btrfs: show correct warning if can't read data reloc tree

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If a filesystem is missing its data reloc tree, we get something like
this in dmesg:

  BTRFS warning (device loop11): failed to read root (objectid=4): -2
  BTRFS error (device loop11): open_ctree failed: -2

objectid is BTRFS_DEV_TREE_OBJECTID, but this should actually be the
value of BTRFS_DATA_RELOC_TREE_OBJECTID.

btrfs_read_roots() prints location.objectid on failure, but this isn't
set when reading the data reloc tree. Set location.objectid to the
correct value on failure, so that the error message makes sense.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Mark Harmstone <mark@harmstone.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Mark Harmstone 2025-12-19 18:15:28 +00:00 committed by David Sterba
parent 530e3d4af5
commit 2bb83bc42b
1 changed files with 1 additions and 0 deletions
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fs/btrfs/disk-io.c
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@ -2255,6 +2255,7 @@ static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
BTRFS_DATA_RELOC_TREE_OBJECTID, true);
if (IS_ERR(root)) {
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID;
ret = PTR_ERR(root);
goto out;
}