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9pfs: deprecate handle backend

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This backend raise some concerns:

- doesn't support symlinks
- fails +100 tests in the PJD POSIX file system test suite [1]
- requires the QEMU process to run with the CAP_DAC_READ_SEARCH
  capability, which isn't recommended for security reasons

This backend should not be used and wil be removed. The 'local'
backend is the recommended alternative.

[1] https://www.tuxera.com/community/posix-test-suite/

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Greg Kurz 2018-01-08 11:18:23 +01:00
parent 65603a801e
commit db3b3c7281
2 changed files with 10 additions and 0 deletions
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8
qemu-doc.texi
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@ -2724,6 +2724,14 @@ default channel subsystem image for guests that do not support multiple
channel subsystems, all devices can be put into the default channel
subsystem image.
@subsection -fsdev handle (since 2.12.0)
The ``handle'' fsdev backend does not support symlinks and causes the 9p
filesystem in the guest to fail a fair amount of tests from the PJD POSIX
filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
which is not the recommended way to run QEMU. This backend should not be
used and it will be removed with no replacement.
@section qemu-img command line arguments
@subsection convert -s (since 2.0.0)