Re: filesystem dead, xfs_repair won't help

[Avi Kivity <avi@scylladb.com>]

On 04/11/2017 03:00 PM, Emmanuel Florac wrote:
> Le Tue, 11 Apr 2017 14:40:15 +0300
> Avi Kivity <avi@scylladb.com> écrivait:
>
>> $ sudo xfs_db -c "sb 0" /tmp/fs
>> xfs_db: /tmp/fs is not a valid XFS filesystem (unexpected SB magic
>> number 0x5846534d)
>> Use -F to force a read attempt.
>> $ sudo xfs_db -F -c "sb 0" /tmp/fs
>> xfs_db: /tmp/fs is not a valid XFS filesystem (unexpected SB magic
>> number 0x5846534d)
>> xfs_db: V1 inodes unsupported. Please try an older xfsprogs.
> Oops, I forgot one important part, sorry, you must restore the
> meta_dump to a file first:
>
> xfs_mdrestore /tmp/fs /tmp/fsimage
>
> then run xfs_db on the /tmp/fsimage:
>
> xfs_db -c 'sb 0' -c 'p' /tmp/fsimage
>

magicnum = 0x58465342
blocksize = 4096
dblocks = 125026902
rblocks = 0
rextents = 0
uuid = 50b25ad8-3eb9-4273-b7f2-d0a435b3a08f
logstart = 67108869
rootino = 96
rbmino = 97
rsumino = 98
rextsize = 1
agblocks = 31256726
agcount = 4
rbmblocks = 0
logblocks = 61048
versionnum = 0xb4b5
sectsize = 512
inodesize = 512
inopblock = 8
fname = "\000\000\000\000\000\000\000\000\000\000\000\000"
blocklog = 12
sectlog = 9
inodelog = 9
inopblog = 3
agblklog = 25
rextslog = 0
inprogress = 0
imax_pct = 25
icount = 1959744
ifree = 89
fdblocks = 91586587
frextents = 0
uquotino = null
gquotino = null
qflags = 0
flags = 0
shared_vn = 0
inoalignmt = 4
unit = 0
width = 0
dirblklog = 0
logsectlog = 0
logsectsize = 0
logsunit = 1
features2 = 0x18a
bad_features2 = 0x18a
features_compat = 0
features_ro_compat = 0x1
features_incompat = 0x1
features_log_incompat = 0
crc = 0x3ebf41de (correct)
spino_align = 0
pquotino = null
lsn = 0x70002828b
meta_uuid = 00000000-0000-0000-0000-000000000000