[PATCH v3 0/3] btrfs: small changes to "usebackuproot" mount option

[CHANGELOG]
v3:
- Add "rescue=usebackuproot" into full RO mount options
- Minor grammar updates

v2:
- Also include "rescue=usebackuproot" into "rescue=all" shortcut

"rescue=usebackuproot" mount option is not requiring a read-only mount,
which is different from all the other options in the "rescue=" group.
Address that in the first patch.

Then also include "rescue=usebackuproot" into "rescue=all" group, done
in the second patch.

Standalone "usebackuproot" mount option is already marked deprecated
since v5.9, I see no practical reason to keep supporting it in 2026.
Just remove it in the last patch.

Qu Wenruo (3):
  btrfs: add "rescue=usebackuproot" into forced read-only options
  btrfs: add "rescue=usebackuproot" into "rescue=all" shortcut
  btrfs: remove "usebackuproot" mount option

 fs/btrfs/fs.h    |  3 ++-
 fs/btrfs/super.c | 16 +++-------------
 2 files changed, 5 insertions(+), 14 deletions(-)

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2.54.0