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virtiofsd: Add mount ID to the lo_inode key

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Using st_dev is not sufficient to uniquely identify a mount: You can
mount the same device twice, but those are still separate trees, and
e.g. by mounting something else inside one of them, they may differ.

Using statx(), we can get a mount ID that uniquely identifies a mount.
If that is available, add it to the lo_inode key.

Most of this patch is taken from Miklos's mail here:
https://marc.info/?l=fuse-devel&m=160062521827983
(virtiofsd-use-mount-id.patch attachment)

Suggested-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20201102161859.156603-5-mreitz@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Max Reitz 2020-11-02 17:18:56 +01:00 • committed by Dr. David Alan Gilbert
parent 84e319a575
commit d672fce6ba
2 changed files with 86 additions and 10 deletions
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1
tools/virtiofsd/passthrough_seccomp.c
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@ -76,6 +76,7 @@ static const int syscall_whitelist[] = {
SCMP_SYS(mremap),
SCMP_SYS(munmap),
SCMP_SYS(newfstatat),
SCMP_SYS(statx),
SCMP_SYS(open),
SCMP_SYS(openat),
SCMP_SYS(ppoll),