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Diffstat (limited to 'runsc/fsgofer/fsgofer.go')
-rw-r--r--runsc/fsgofer/fsgofer.go98
1 files changed, 19 insertions, 79 deletions
diff --git a/runsc/fsgofer/fsgofer.go b/runsc/fsgofer/fsgofer.go
index e03bb7752..fd913831a 100644
--- a/runsc/fsgofer/fsgofer.go
+++ b/runsc/fsgofer/fsgofer.go
@@ -26,7 +26,6 @@ import (
"math"
"os"
"path"
- "strings"
"sync"
"syscall"
@@ -181,18 +180,6 @@ func (a *attachPoint) makeQID(stat syscall.Stat_t) p9.QID {
}
}
-func isNameValid(name string) bool {
- if name == "" || name == "." || name == ".." {
- log.Warningf("Invalid name: %s", name)
- return false
- }
- if strings.IndexByte(name, '/') >= 0 {
- log.Warningf("Invalid name: %s", name)
- return false
- }
- return true
-}
-
// localFile implements p9.File wrapping a local file. The underlying file
// is opened during Walk() and stored in 'controlFile' to be used with other
// operations. The mode in which the file is opened varies depending on the
@@ -228,11 +215,7 @@ type localFile struct {
// attachPoint is the attachPoint that serves this localFile.
attachPoint *attachPoint
- // mu protects 'hostPath' when file is renamed.
- mu sync.Mutex
-
- // TODO: hostPath is not safe to use as path needs to be walked
- // everytime (and can change underneath us). Remove all usages.
+ // hostPath will be safely updated by the Renamed hook.
hostPath string
// controlFile is opened when localFile is created and it's never nil.
@@ -246,6 +229,7 @@ type localFile struct {
// if localFile isn't opened.
mode p9.OpenFlags
+ // ft is the fileType for this file.
ft fileType
// readDirMu protects against concurrent Readdir calls.
@@ -296,10 +280,7 @@ func openAnyFile(parent *localFile, name string) (*os.File, string, error) {
return nil, "", extractErrno(err)
}
- parent.mu.Lock()
- defer parent.mu.Unlock()
newPath := path.Join(parent.hostPath, name)
-
return os.NewFile(uintptr(fd), newPath), newPath, nil
}
@@ -382,13 +363,10 @@ func (l *localFile) Open(mode p9.OpenFlags) (*fd.FD, p9.QID, uint32, error) {
log.Debugf("Open reopening file, mode: %v, %q", mode, l.controlFile.Name())
var err error
- l.mu.Lock()
newFile, err = os.OpenFile(l.hostPath, openFlags|mode.OSFlags(), 0)
if err != nil {
- l.mu.Unlock()
return nil, p9.QID{}, 0, extractErrno(err)
}
- l.mu.Unlock()
}
stat, err := stat(int(newFile.Fd()))
@@ -418,9 +396,6 @@ func (l *localFile) Create(name string, mode p9.OpenFlags, perm p9.FileMode, uid
}
return nil, nil, p9.QID{}, 0, syscall.EBADF
}
- if !isNameValid(name) {
- return nil, nil, p9.QID{}, 0, syscall.EINVAL
- }
// Use a single file for both 'controlFile' and 'openedFile'. Mode must include read for control
// and whichever else was requested by caller. Note that resulting file might have a wider mode
@@ -452,9 +427,6 @@ func (l *localFile) Create(name string, mode p9.OpenFlags, perm p9.FileMode, uid
return nil, nil, p9.QID{}, 0, extractErrno(err)
}
- l.mu.Lock()
- defer l.mu.Unlock()
-
cPath := path.Join(l.hostPath, name)
f := os.NewFile(uintptr(fd), cPath)
c := &localFile{
@@ -477,10 +449,6 @@ func (l *localFile) Mkdir(name string, perm p9.FileMode, uid p9.UID, gid p9.GID)
return p9.QID{}, syscall.EBADF
}
- if !isNameValid(name) {
- return p9.QID{}, syscall.EINVAL
- }
-
if err := syscall.Mkdirat(l.controlFD(), name, uint32(perm.Permissions())); err != nil {
return p9.QID{}, extractErrno(err)
}
@@ -517,9 +485,6 @@ func (l *localFile) Walk(names []string) ([]p9.QID, p9.File, error) {
return nil, nil, extractErrno(err)
}
- l.mu.Lock()
- defer l.mu.Unlock()
-
c := &localFile{
attachPoint: l.attachPoint,
hostPath: l.hostPath,
@@ -532,10 +497,6 @@ func (l *localFile) Walk(names []string) ([]p9.QID, p9.File, error) {
var qids []p9.QID
last := l
for _, name := range names {
- if !isNameValid(name) {
- return nil, nil, syscall.EINVAL
- }
-
f, path, err := openAnyFile(last, name)
if err != nil {
return nil, nil, extractErrno(err)
@@ -761,15 +722,15 @@ func (l *localFile) SetAttr(valid p9.SetAttrMask, attr p9.SetAttr) error {
return err
}
-// Remove implements p9.File.
-//
-// This is deprecated in favor of UnlinkAt.
-func (*localFile) Remove() error {
- return syscall.ENOSYS
+// Rename implements p9.File; this should never be called.
+func (l *localFile) Rename(p9.File, string) error {
+ panic("rename called directly")
}
-// Rename implements p9.File.
-func (l *localFile) Rename(directory p9.File, name string) error {
+// RenameAt implements p9.File.RenameAt.
+//
+// TODO: change to renameat(2).
+func (l *localFile) RenameAt(oldName string, directory p9.File, newName string) error {
conf := l.attachPoint.conf
if conf.ROMount {
if conf.PanicOnWrite {
@@ -777,34 +738,16 @@ func (l *localFile) Rename(directory p9.File, name string) error {
}
return syscall.EBADF
}
- if !isNameValid(name) {
- return syscall.EINVAL
- }
-
- l.mu.Lock()
- defer l.mu.Unlock()
- // TODO: change to renameat(2)
- parent := directory.(*localFile)
- newPath := path.Join(parent.hostPath, name)
- if err := syscall.Rename(l.hostPath, newPath); err != nil {
+ newParent := directory.(*localFile)
+ oldPath := path.Join(l.hostPath, oldName)
+ newPath := path.Join(newParent.hostPath, newName)
+ if err := syscall.Rename(oldPath, newPath); err != nil {
return extractErrno(err)
}
-
- // Update path on success.
- // TODO: this doesn't cover cases where any of the
- // parents have been renamed.
- l.hostPath = newPath
return nil
}
-// RenameAt implements p9.File.RenameAt.
-//
-// Code still uses [deprecated] Rename().
-func (*localFile) RenameAt(_ string, _ p9.File, _ string) error {
- return syscall.ENOSYS
-}
-
// ReadAt implements p9.File.
func (l *localFile) ReadAt(p []byte, offset uint64) (int, error) {
if l.mode != p9.ReadOnly && l.mode != p9.ReadWrite {
@@ -848,9 +791,6 @@ func (l *localFile) Symlink(target, newName string, uid p9.UID, gid p9.GID) (p9.
}
return p9.QID{}, syscall.EBADF
}
- if !isNameValid(newName) {
- return p9.QID{}, syscall.EINVAL
- }
if err := unix.Symlinkat(target, l.controlFD(), newName); err != nil {
return p9.QID{}, extractErrno(err)
@@ -882,9 +822,6 @@ func (l *localFile) Link(target p9.File, newName string) error {
}
return syscall.EBADF
}
- if !isNameValid(newName) {
- return syscall.EINVAL
- }
targetFile := target.(*localFile)
if err := unix.Linkat(targetFile.controlFD(), "", l.controlFD(), newName, linux.AT_EMPTY_PATH); err != nil {
@@ -909,9 +846,7 @@ func (l *localFile) UnlinkAt(name string, flags uint32) error {
}
return syscall.EBADF
}
- if !isNameValid(name) {
- return syscall.EINVAL
- }
+
if err := unix.Unlinkat(l.controlFD(), name, int(flags)); err != nil {
return extractErrno(err)
}
@@ -1000,6 +935,11 @@ func (l *localFile) Close() error {
return err
}
+// Renamed implements p9.Renamed.
+func (l *localFile) Renamed(newDir p9.File, newName string) {
+ l.hostPath = path.Join(newDir.(*localFile).hostPath, newName)
+}
+
// extractErrno tries to determine the errno.
func extractErrno(err error) syscall.Errno {
if err == nil {
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 15:34:27 +0000