[fuse-devel] "fuse: writing device: Invalid argument" from mountlo

[Charles D. <Cha...@me...>]

As previously announced, I've been working on a version of mountlo able 
to mount NBD devices and/or use LVM volumes, in addition to previously 
available functionality. I've made significant headway (though the build 
process for the buildroot-based userland is presently nontrivial, and 
will need to be cleaned up before I can release a patch).

In any event, the guest now completes the mount, hands control back to 
mountlo's modified fusexmp, and prints the following:

=====
+ /bin/busybox mount -o ro /dev/mapper/vg01-root /mnt
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
fuseserv_dev_open 1 102
   fuseserv_dev_open 1 0000000000000066
unique: 1, opcode: INIT (26), nodeid: 0, insize: 56
INIT: 7.9
flags=0x0000003b
max_readahead=0x00020000
    INIT: 7.8
    flags=0x00000000
    max_readahead=0x00020000
    max_write=0x00020000
    unique: 1, error: 0 (Success), outsize: 40
fuse: writing device: Invalid argument
=====

After this point, the mount stops responding; no further requests are 
made to the NBD server, attempts to read from the mount point on the 
client fail, etc.

Some feedback from folks more familiar with the codebase (*poke* Miklos 
*poke*) would be very much appreciated.