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https://github.com/brain-hackers/u-boot-brain
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1afb9f2222
When the btrfs_read_fs_root() function is searching a ROOT_ITEM with
location key offset other than -1, it currently fails via BUG_ON.
The offset can have other value than -1, though. This can happen for
example if a subvolume is renamed:
$ btrfs subvolume create X && sync
Create subvolume './X'
$ btrfs inspect-internal dump-tree /dev/root | grep -B 2 'name: X$
location key (270 ROOT_ITEM 18446744073709551615) type DIR
transid 283 data_len 0 name_len 1
name: X
$ mv X Y && sync
$ btrfs inspect-internal dump-tree /dev/root | grep -B 2 'name: Y$
location key (270 ROOT_ITEM 0) type DIR
transid 285 data_len 0 name_len 1
name: Y
As can be seen the offset changed from -1ULL to 0.
Do not fail in this case.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: David Sterba <dsterba@suse.com>
Cc: Qu Wenruo <wqu@suse.com>
Cc: Tom Rini <trini@konsulko.com>
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|---|---|---|
| .. | ||
| common | ||
| crypto | ||
| kernel-shared | ||
| btrfs.c | ||
| btrfs.h | ||
| compat.h | ||
| compression.c | ||
| conv-funcs.h | ||
| ctree.c | ||
| ctree.h | ||
| dev.c | ||
| dir-item.c | ||
| disk-io.c | ||
| disk-io.h | ||
| extent-cache.c | ||
| extent-cache.h | ||
| extent-io.c | ||
| extent-io.h | ||
| inode.c | ||
| Kconfig | ||
| Makefile | ||
| root-tree.c | ||
| subvolume.c | ||
| volumes.c | ||
| volumes.h | ||