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libct: add a fallback for nr_inodes=2

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We don't know whether some kernels will fail with "nr_inodes=2",
so let's fall back to mount a tmpfs without "nr_inodes".

Signed-off-by: lifubang <lifubang@acmcoder.com>
This commit is contained in:
lifubang
2026-06-29 11:08:08 +00:00
parent feea25820e
commit 79ac57770f
1 changed files with 7 additions and 1 deletions
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libcontainer/rootfs_linux.go
+7 -1
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@@ -1336,7 +1336,13 @@ func maskDir(path, mountLabel string) error {
// "nr_inodes<2", so let's keep `nr_inodes=2` here! // "nr_inodes<2", so let's keep `nr_inodes=2` here!
// For reference, search for "case Opt_nr_inodes" in: // For reference, search for "case Opt_nr_inodes" in:
// https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/plain/mm/shmem.c?h=Ubuntu-5.4.0-216.236 // https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/plain/mm/shmem.c?h=Ubuntu-5.4.0-216.236
return mount("tmpfs", path, "tmpfs", unix.MS_RDONLY, label.FormatMountLabel("nr_blocks=1,nr_inodes=2", mountLabel)) err := mount("tmpfs", path, "tmpfs", unix.MS_RDONLY, label.FormatMountLabel("nr_blocks=1,nr_inodes=2", mountLabel))
// We don't know whether some kernels will fail with "nr_inodes=2",
// so let's fall back to mount a tmpfs without this option.
if errors.Is(err, unix.EINVAL) {
err = mount("tmpfs", path, "tmpfs", unix.MS_RDONLY, label.FormatMountLabel("nr_blocks=1", mountLabel))
}
return err
} }
// maskPaths masks the top of the specified paths inside a container to avoid // maskPaths masks the top of the specified paths inside a container to avoid