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Pass configurable FilesystemType to tmpfs. 

PiperOrigin-RevId: 304234086
This commit is contained in:
Nicolas Lacasse 2020-04-01 12:05:17 -07:00 committed by gVisor bot
parent 38f4501c99
commit 0d1e299079
1 changed files with 19 additions and 7 deletions
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26
pkg/sentry/fsimpl/tmpfs/tmpfs.go
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@ -77,6 +77,11 @@ type FilesystemOpts struct {
// RootSymlinkTarget is the target of the root symlink. Only valid if
// RootFileType == S_IFLNK.
RootSymlinkTarget string
// FilesystemType allows setting a different FilesystemType for this
// tmpfs filesystem. This allows tmpfs to "impersonate" other
// filesystems, like ramdiskfs and cgroupfs.
FilesystemType vfs.FilesystemType
}
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
@ -91,15 +96,22 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
clock: clock,
}
fs.vfsfs.Init(vfsObj, &fstype, &fs)
typ := uint16(linux.S_IFDIR)
rootFileType := uint16(linux.S_IFDIR)
newFSType := vfs.FilesystemType(&fstype)
tmpfsOpts, ok := opts.InternalData.(FilesystemOpts)
if ok && tmpfsOpts.RootFileType != 0 {
typ = tmpfsOpts.RootFileType
if ok {
if tmpfsOpts.RootFileType != 0 {
rootFileType = tmpfsOpts.RootFileType
}
if tmpfsOpts.FilesystemType != nil {
newFSType = tmpfsOpts.FilesystemType
}
}
fs.vfsfs.Init(vfsObj, newFSType, &fs)
var root *inode
switch typ {
switch rootFileType {
case linux.S_IFREG:
root = fs.newRegularFile(creds, 0777)
case linux.S_IFLNK:
@ -107,7 +119,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
case linux.S_IFDIR:
root = fs.newDirectory(creds, 01777)
default:
return nil, nil, fmt.Errorf("invalid tmpfs root file type: %#o", typ)
return nil, nil, fmt.Errorf("invalid tmpfs root file type: %#o", rootFileType)
}
return &fs.vfsfs, &fs.newDentry(root).vfsd, nil
}