[PATCH 0/3] btrfs-progs: check: Introduce optional argument for -b|--backup

[Qu Wenruo <wqu@suse.com>]

Before this patchset, if we want to use backup roots, it's only possible
to let btrfs-check to automatically choose the backup.

If user want to use a specified backup, it can only use -r|--tree-root
option along with backup roots dump from "btrfs ins dump-super".

This patchset will introduce optional argument for -b|--backup, so user
can specify which backup to use by providing the generation difference
(-3, -2, -1).

If the optional argument is not provided, the default value is -1, and
the behavior should be pretty much the same.

Qu Wenruo (3):
  btrfs-progs: utils-lib: Use error() to replace fprintf(stderr, "ERROR:
    ")
  btrfs-progs: disk-io: Handle backup root more correctly
  btrfs-progs: check: Introduce optional argument for -b|--backup

 Documentation/btrfs-check.asciidoc |  6 ++--
 check/main.c                       | 33 +++++++++++++++---
 common/utils.h                     |  1 +
 ctree.h                            |  8 +++++
 disk-io.c                          | 55 ++++++++++++++++++++++++------
 disk-io.h                          | 33 +++++++++++-------
 utils-lib.c                        | 25 +++++++++++---
 7 files changed, 127 insertions(+), 34 deletions(-)

-- 
2.23.0