Greetings!
I've been using a btrfs-based volume for backups, but lately the
system's been filling the syslog with errors like "btrfs_log2phys:
cannot lookup extent mapping for 7129125486592" at the rate of hundreds
per second. (Please see output below for more details.) Despite the
errors, the files I've looked at appear to be written and read successfully.
I'm wondering if the contents of the volume are trustworthy and whether
this problem is resolvable without backing up, erasing and starting over?
Thank you!
David
# uname -a
Linux backup2 3.0.101.RNx86_64.3 #1 SMP Wed Apr 1 16:02:14 PDT 2015
x86_64 GNU/Linux
# btrfs --version
Btrfs v3.17.3
# btrfs fi show
Label: '43f66d40:root' uuid: 6e546e1a-15a3-4e9d-97f7-9693659a5e7e
Total devices 1 FS bytes used 571.47MiB
devid 1 size 4.00GiB used 3.36GiB path /dev/md0
Label: '43f66d40:data' uuid: 0900d3c7-fda1-463a-81e5-19c04e68a0cb
Total devices 1 FS bytes used 27.61TiB
devid 1 size 36.34TiB used 27.99TiB path /dev/md127
Btrfs v3.17.3
# dmesg | head
s_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
btrfs_log2phys: cannot lookup extent mapping for 7168108658688
# dmesg | tail
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
btrfs_log2phys: cannot lookup extent mapping for 7168110034944
[dmesg.log is filled with 3951 lines of the same type of errors]
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