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author | gVisor bot <gvisor-bot@google.com> | 2020-04-23 22:40:10 +0000 |
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committer | gVisor bot <gvisor-bot@google.com> | 2020-04-23 22:40:10 +0000 |
commit | 621ac539dfe6db975450a12ed4cc0140e3e1d2f5 (patch) | |
tree | 6f6f9c1a18e83b4c17921f9ffb7356c3256b4a13 /pkg/sentry/vfs/options.go | |
parent | 6b966db0b383c61fdfa6b7f182012282c164cd65 (diff) | |
parent | 5042ea7e2cbdc0c04fd454583589a3b1e152f95d (diff) |
Merge release-20200323.0-225-g5042ea7 (automated)
Diffstat (limited to 'pkg/sentry/vfs/options.go')
-rwxr-xr-x | pkg/sentry/vfs/options.go | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/pkg/sentry/vfs/options.go b/pkg/sentry/vfs/options.go index 534528ce6..022bac127 100755 --- a/pkg/sentry/vfs/options.go +++ b/pkg/sentry/vfs/options.go @@ -33,6 +33,25 @@ type GetDentryOptions struct { type MkdirOptions struct { // Mode is the file mode bits for the created directory. Mode linux.FileMode + + // If ForSyntheticMountpoint is true, FilesystemImpl.MkdirAt() may create + // the given directory in memory only (as opposed to persistent storage). + // The created directory should be able to support the creation of + // subdirectories with ForSyntheticMountpoint == true. It does not need to + // support the creation of subdirectories with ForSyntheticMountpoint == + // false, or files of other types. + // + // FilesystemImpls are permitted to ignore the ForSyntheticMountpoint + // option. + // + // The ForSyntheticMountpoint option exists because, unlike mount(2), the + // OCI Runtime Specification permits the specification of mount points that + // do not exist, under the expectation that container runtimes will create + // them. (More accurately, the OCI Runtime Specification completely fails + // to document this feature, but it's implemented by runc.) + // ForSyntheticMountpoint allows such mount points to be created even when + // the underlying persistent filesystem is immutable. + ForSyntheticMountpoint bool } // MknodOptions contains options to VirtualFilesystem.MknodAt() and |