xapi-project / xen-api / 20822065389
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libs: add Stat module in Unixext to handle special device IDs (#6812)

These device IDs are handled in an ad-hoc way, and none of the
implementations follow the actual linux behaviour, replace all of them
with an in imeplementation that uses the glibc macros to handle these.

Also change vhd_wrapper_tool to print better error messages when there's
an error when getting the base VHD.

Reproduction steps:

- Create a pool with 2 hosts
- SSH into one of the hosts and run `for i in $(seq 1 512) ; do tap-ctl
allocate; done`. This forces the minor device ID to be higher than 255
for the local VBD created.
- Create a guest in the local SR of the host where the previous command
was run, with the guest tools installed to support live migration.
- Live-migrate the guest between the hosts:
```
xe vm-migrate live=true uuid=ff50e9b1-c155-ed39-a2cc-680f9acaada4 host=pau-xcp-01 vdi:f613c010-7c06-4288-b0db-d1bde01fe0ef=23df0f9c-a9d8-5756-c829-e3655a225224 remote-master=pau-xcp-00 remote-username=root remote-password=xxx

Performing a storage live migration. Your VM's VDIs will be migrated with the VM.
Will migrate to remote host: pau-xcp-01, using remote network: Pool-wide network associated with eth0. Here is the VDI mapping:
VDI f613c010-7c06-4288-b0db-d1bde01fe0ef -> SR 23df0f9c-a9d8-5756-c829-e3655a225224
The server failed to handle your request, due to an internal error. The given message may give details useful for debugging the problem.
message: Storage_error ([S(Internal_error);S(Storage_error ([S(Migration_mirror_fd_failure);S(VDI Not Attached)]))])
```

The migration succeeds when both hosts in the pool have the changes in
this PR running.

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