[BUG]
Test case misc/034 can fail like this:
====== RUN CHECK mount /dev/loop16 /home/adam/btrfs-progs/tests/mnt
mount: /home/adam/btrfs-progs/tests/mnt: wrong fs type, bad option, bad superblock on /dev/loop16, missing codepage or helper program, or other error.
dmesg(1) may have more information after failed mount system call.
failed: mount /dev/loop16 /home/adam/btrfs-progs/tests/mnt
And the dmesg looks like this:
loop16: detected capacity change from 0 to 1024000
loop17: detected capacity change from 0 to 1024000
BTRFS: device fsid 593e23af-a7e6-4360-b16a-229f415de697 devid 1 transid 6 /dev/loop16 scanned by mount (79348)
BTRFS info (device loop16): using crc32c (crc32c-intel) checksum algorithm
BTRFS info (device loop16): found metadata UUID change in progress flag, clearing
BTRFS info (device loop16): disk space caching is enabled
BTRFS error (device loop16): devid 2 uuid cde07de6-db7e-4b34-909e-d3db6e7c0b06 is missing
BTRFS error (device loop16): failed to read the system array: -2
BTRFS error (device loop16): open_ctree failed
[CAUSE]
From the dmesg, it shows that although both loopback devices are
properly registered, only one is properly scanned by mount.
Thus the other device is missing, and without "-o degraded" the
filesystem failed to be mounted.
[FIX]
Before we mount the filesystem, also scan them in their passed order
to properly assemble the device list for mount.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
788e30f7ea