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libct: Enforce nr_inodes=2 to fix Focal mount errors

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On most kernels `nr_inodes=1` works fine. However, Ubuntu 20.04 (Focal) with
the official 5.4 kernel carries a private patch in mm/shmem.c that rejects
"nr_inodes<2", so let's keep `nr_inodes=2` here!

Signed-off-by: lifubang <lifubang@acmcoder.com>
This commit is contained in:
lifubang
2026-06-29 15:48:25 +00:00
parent a081198d54
commit feea25820e
1 changed files with 6 additions and 1 deletions
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libcontainer/rootfs_linux.go
+6 -1
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@@ -1331,7 +1331,12 @@ func verifyDevNull(f *os.File) error {
// maskDir mounts a read-only tmpfs on top of the specified path.
func maskDir(path, mountLabel string) error {
return mount("tmpfs", path, "tmpfs", unix.MS_RDONLY, label.FormatMountLabel("nr_blocks=1,nr_inodes=1", mountLabel))
// On most kernels `nr_inodes=1` works fine. However, Ubuntu 20.04 (Focal) with
// the official 5.4 kernel carries a private patch in mm/shmem.c that rejects
// "nr_inodes<2", so let's keep `nr_inodes=2` here!
// 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
return mount("tmpfs", path, "tmpfs", unix.MS_RDONLY, label.FormatMountLabel("nr_blocks=1,nr_inodes=2", mountLabel))
}
// maskPaths masks the top of the specified paths inside a container to avoid