diff options
Diffstat (limited to 'pkg/sentry/fsimpl/sys/sys.go')
| -rw-r--r-- | pkg/sentry/fsimpl/sys/sys.go | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go index 54fa5eced..7d2147141 100644 --- a/pkg/sentry/fsimpl/sys/sys.go +++ b/pkg/sentry/fsimpl/sys/sys.go @@ -18,6 +18,7 @@ package sys import ( "bytes" "fmt" + "strconv" "gvisor.dev/gvisor/pkg/abi/linux" "gvisor.dev/gvisor/pkg/context" @@ -29,9 +30,12 @@ import ( "gvisor.dev/gvisor/pkg/syserror" ) -// Name is the default filesystem name. -const Name = "sysfs" -const defaultSysDirMode = linux.FileMode(0755) +const ( + // Name is the default filesystem name. + Name = "sysfs" + defaultSysDirMode = linux.FileMode(0755) + defaultMaxCachedDentries = uint64(1000) +) // FilesystemType implements vfs.FilesystemType. // @@ -62,9 +66,21 @@ func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt return nil, nil, err } + mopts := vfs.GenericParseMountOptions(opts.Data) + maxCachedDentries := defaultMaxCachedDentries + if str, ok := mopts["dentry_cache_limit"]; ok { + delete(mopts, "dentry_cache_limit") + maxCachedDentries, err = strconv.ParseUint(str, 10, 64) + if err != nil { + ctx.Warningf("sys.FilesystemType.GetFilesystem: invalid dentry cache limit: dentry_cache_limit=%s", str) + return nil, nil, syserror.EINVAL + } + } + fs := &filesystem{ devMinor: devMinor, } + fs.MaxCachedDentries = maxCachedDentries fs.VFSFilesystem().Init(vfsObj, &fsType, fs) root := fs.newDir(ctx, creds, defaultSysDirMode, map[string]kernfs.Inode{ |