Some command in current tools can't support filesystem with multiple
loop device, for example:
# truncate -s 200M ./1.img
# truncate -s 200M ./2.img
# mkfs.btrfs -f ./1.img ./2.img
#
# btrfs rescue chunk-recover -v ./1.img
All Devices:
Device: id = 1, name = ./1.img
...
# btrfs rescue super-recover -v ./1.img
All Devices:
Device: id = 1, name = ./1.img
...
# btrfs rescue zero-log ./1.img
warning devid 2 not found already
Clearing log on ./1.img, previous log_root 0, level 0
...
As a workaround, we can bind all of above image files to loop device,
but to make things simple, this patch introduce --extra-dev option,
to specify non-block-device manually, as:
# btrfs rescue chunk-recover -v --extra-device=./2.img ./1.img
All Devices:
Device: id = 2, name = ./2.img
Device: id = 1, name = ./1.img
...
# btrfs rescue super-recover --extra-dev=./2.img -v ./1.img
All Devices:
Device: id = 2, name = ./2.img
Device: id = 1, name = ./1.img
...
# btrfs rescue zero-log --extra-dev=./2.img ./1.img
Clearing log on ./1.img, previous log_root 0, level 0
We can add multiple extra-dev by:
--extra-dev="1.img,2.img"
or
--extra-dev=1.img --extra-dev=2.img
Zhao Lei (5):
btrfs-progs: Introduce --extra-dev option
btrfs-progs: Support extra-dev for btrfs rescue
btrfs-progs: Avoid using uninitialized optind in cmd_rescue_zero_log
btrfs-progs: add help command to btrfs rescue zero-log
btrfs-progs: update manual for --extra-dev and -h for btrfs rescue
Documentation/btrfs-rescue.asciidoc | 13 ++++++-
cmds-rescue.c | 39 +++++++++++++++++----
utils.c | 70 +++++++++++++++++++++++++++++++++++++
utils.h | 5 +++
4 files changed, 119 insertions(+), 8 deletions(-)
--
1.8.5.1
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