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authorJamie Liu <jamieliu@google.com>2019-11-25 18:09:15 -0800
committergVisor bot <gvisor-bot@google.com>2019-11-25 18:10:31 -0800
commitb72e1b3c0873ea29d031db42e39ca053923eecff (patch)
treef498c128634c53fc1db1cd029c761f4c8ad11c8e /pkg/sentry/time/clock_id.go
parent128948d6ae94009c6ad13a0bd96e03e45a560477 (diff)
Minor VFS2 interface changes.
- Remove the Filesystem argument from DentryImpl.*Ref(); in general DentryImpls that need the Filesystem for reference counting will probably also need it for other interface methods that don't plumb Filesystem, so it's easier to just store a pointer to the filesystem in the DentryImpl. - Add a pointer to the VirtualFilesystem to Filesystem, which is needed by the gofer client to disown dentries for cache eviction triggered by dentry reference count changes. - Rename FilesystemType.NewFilesystem to GetFilesystem; in some cases (e.g. sysfs, cgroupfs) it's much cleaner for there to be only one Filesystem that is used by all mounts, and in at least one case (devtmpfs) it's visibly incorrect not to do so, so NewFilesystem doesn't always actually create and return a *new* Filesystem. - Require callers of FileDescription.Init() to increment Mount/Dentry references. This is because the gofer client may, in the OpenAt() path, take a reference on a dentry with 0 references, which is safe due to synchronization that is outside the scope of this CL, and it would be safer to still have its implementation of DentryImpl.IncRef() check for an increment for 0 references in other cases. - Add FileDescription.TryIncRef. This is used by the gofer client to take references on "special file descriptions" (FDs for files such as pipes, sockets, and devices), which use per-FD handles (fids) instead of dentry-shared handles, for sync() and syncfs(). PiperOrigin-RevId: 282473364
Diffstat (limited to 'pkg/sentry/time/clock_id.go')
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