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-rw-r--r--pkg/sentry/fsimpl/overlay/directory.go4
-rw-r--r--pkg/sentry/fsimpl/overlay/filesystem.go50
-rw-r--r--pkg/sentry/fsimpl/overlay/non_directory.go3
-rw-r--r--pkg/sentry/fsimpl/overlay/overlay.go70
-rw-r--r--pkg/sentry/fsimpl/overlay/overlay_state_autogen.go3
5 files changed, 114 insertions, 16 deletions
diff --git a/pkg/sentry/fsimpl/overlay/directory.go b/pkg/sentry/fsimpl/overlay/directory.go
index aea599460..df4492346 100644
--- a/pkg/sentry/fsimpl/overlay/directory.go
+++ b/pkg/sentry/fsimpl/overlay/directory.go
@@ -117,10 +117,12 @@ func (fd *directoryFD) Release(ctx context.Context) {
// IterDirents implements vfs.FileDescriptionImpl.IterDirents.
func (fd *directoryFD) IterDirents(ctx context.Context, cb vfs.IterDirentsCallback) error {
+ d := fd.dentry()
+ defer d.InotifyWithParent(ctx, linux.IN_ACCESS, 0, vfs.PathEvent)
+
fd.mu.Lock()
defer fd.mu.Unlock()
- d := fd.dentry()
if fd.dirents == nil {
ds, err := d.getDirents(ctx)
if err != nil {
diff --git a/pkg/sentry/fsimpl/overlay/filesystem.go b/pkg/sentry/fsimpl/overlay/filesystem.go
index e9ce4bde1..bd11372d5 100644
--- a/pkg/sentry/fsimpl/overlay/filesystem.go
+++ b/pkg/sentry/fsimpl/overlay/filesystem.go
@@ -499,7 +499,13 @@ func (fs *filesystem) doCreateAt(ctx context.Context, rp *vfs.ResolvingPath, dir
if err := create(parent, name, childLayer == lookupLayerUpperWhiteout); err != nil {
return err
}
+
parent.dirents = nil
+ ev := linux.IN_CREATE
+ if dir {
+ ev |= linux.IN_ISDIR
+ }
+ parent.watches.Notify(ctx, name, uint32(ev), 0 /* cookie */, vfs.InodeEvent, false /* unlinked */)
return nil
}
@@ -631,6 +637,7 @@ func (fs *filesystem) LinkAt(ctx context.Context, rp *vfs.ResolvingPath, vd vfs.
}
return err
}
+ old.watches.Notify(ctx, "", linux.IN_ATTRIB, 0 /* cookie */, vfs.InodeEvent, false /* unlinked */)
return nil
})
}
@@ -975,6 +982,7 @@ func (fs *filesystem) createAndOpenLocked(ctx context.Context, rp *vfs.Resolving
// just can't open it anymore for some reason.
return nil, err
}
+ parent.watches.Notify(ctx, childName, linux.IN_CREATE, 0 /* cookie */, vfs.PathEvent, false /* unlinked */)
return &fd.vfsfd, nil
}
@@ -1236,6 +1244,7 @@ func (fs *filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
}
}
+ vfs.InotifyRename(ctx, &renamed.watches, &oldParent.watches, &newParent.watches, oldName, newName, renamed.isDir())
return nil
}
@@ -1352,6 +1361,7 @@ func (fs *filesystem) RmdirAt(ctx context.Context, rp *vfs.ResolvingPath) error
delete(parent.children, name)
ds = appendDentry(ds, child)
parent.dirents = nil
+ parent.watches.Notify(ctx, name, linux.IN_DELETE|linux.IN_ISDIR, 0 /* cookie */, vfs.InodeEvent, true /* unlinked */)
return nil
}
@@ -1359,12 +1369,25 @@ func (fs *filesystem) RmdirAt(ctx context.Context, rp *vfs.ResolvingPath) error
func (fs *filesystem) SetStatAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.SetStatOptions) error {
var ds *[]*dentry
fs.renameMu.RLock()
- defer fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
d, err := fs.resolveLocked(ctx, rp, &ds)
if err != nil {
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
+ return err
+ }
+ err = d.setStatLocked(ctx, rp, opts)
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
+ if err != nil {
return err
}
+ if ev := vfs.InotifyEventFromStatMask(opts.Stat.Mask); ev != 0 {
+ d.InotifyWithParent(ctx, ev, 0 /* cookie */, vfs.InodeEvent)
+ }
+ return nil
+}
+
+// Precondition: d.fs.renameMu must be held for reading.
+func (d *dentry) setStatLocked(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.SetStatOptions) error {
mode := linux.FileMode(atomic.LoadUint32(&d.mode))
if err := vfs.CheckSetStat(ctx, rp.Credentials(), &opts, mode, auth.KUID(atomic.LoadUint32(&d.uid)), auth.KGID(atomic.LoadUint32(&d.gid))); err != nil {
return err
@@ -1555,11 +1578,14 @@ func (fs *filesystem) UnlinkAt(ctx context.Context, rp *vfs.ResolvingPath) error
panic(fmt.Sprintf("unrecoverable overlayfs inconsistency: failed to create whiteout during UnlinkAt: %v", err))
}
+ var cw *vfs.Watches
if child != nil {
vfsObj.CommitDeleteDentry(ctx, &child.vfsd)
delete(parent.children, name)
ds = appendDentry(ds, child)
+ cw = &child.watches
}
+ vfs.InotifyRemoveChild(ctx, cw, &parent.watches, name)
parent.dirents = nil
return nil
}
@@ -1636,13 +1662,20 @@ func (fs *filesystem) getXattr(ctx context.Context, d *dentry, creds *auth.Crede
func (fs *filesystem) SetXattrAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.SetXattrOptions) error {
var ds *[]*dentry
fs.renameMu.RLock()
- defer fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
d, err := fs.resolveLocked(ctx, rp, &ds)
if err != nil {
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
return err
}
- return fs.setXattrLocked(ctx, d, rp.Mount(), rp.Credentials(), &opts)
+ err = fs.setXattrLocked(ctx, d, rp.Mount(), rp.Credentials(), &opts)
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
+ if err != nil {
+ return err
+ }
+
+ d.InotifyWithParent(ctx, linux.IN_ATTRIB, 0 /* cookie */, vfs.InodeEvent)
+ return nil
}
// Precondition: fs.renameMu must be locked.
@@ -1673,13 +1706,20 @@ func (fs *filesystem) setXattrLocked(ctx context.Context, d *dentry, mnt *vfs.Mo
func (fs *filesystem) RemoveXattrAt(ctx context.Context, rp *vfs.ResolvingPath, name string) error {
var ds *[]*dentry
fs.renameMu.RLock()
- defer fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
d, err := fs.resolveLocked(ctx, rp, &ds)
if err != nil {
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
return err
}
- return fs.removeXattrLocked(ctx, d, rp.Mount(), rp.Credentials(), name)
+ err = fs.removeXattrLocked(ctx, d, rp.Mount(), rp.Credentials(), name)
+ fs.renameMuRUnlockAndCheckDrop(ctx, &ds)
+ if err != nil {
+ return err
+ }
+
+ d.InotifyWithParent(ctx, linux.IN_ATTRIB, 0 /* cookie */, vfs.InodeEvent)
+ return nil
}
// Precondition: fs.renameMu must be locked.
diff --git a/pkg/sentry/fsimpl/overlay/non_directory.go b/pkg/sentry/fsimpl/overlay/non_directory.go
index 50b4a50f1..853aee951 100644
--- a/pkg/sentry/fsimpl/overlay/non_directory.go
+++ b/pkg/sentry/fsimpl/overlay/non_directory.go
@@ -184,6 +184,9 @@ func (fd *nonDirectoryFD) SetStat(ctx context.Context, opts vfs.SetStatOptions)
return err
}
d.updateAfterSetStatLocked(&opts)
+ if ev := vfs.InotifyEventFromStatMask(opts.Stat.Mask); ev != 0 {
+ d.InotifyWithParent(ctx, ev, 0, vfs.InodeEvent)
+ }
return nil
}
diff --git a/pkg/sentry/fsimpl/overlay/overlay.go b/pkg/sentry/fsimpl/overlay/overlay.go
index b03fa9121..dfbccd05f 100644
--- a/pkg/sentry/fsimpl/overlay/overlay.go
+++ b/pkg/sentry/fsimpl/overlay/overlay.go
@@ -462,6 +462,13 @@ type dentry struct {
isMappable uint32
locks vfs.FileLocks
+
+ // watches is the set of inotify watches on the file repesented by this dentry.
+ //
+ // Note that hard links to the same file will not share the same set of
+ // watches, due to the fact that we do not have inode structures in this
+ // overlay implementation.
+ watches vfs.Watches
}
// newDentry creates a new dentry. The dentry initially has no references; it
@@ -521,6 +528,14 @@ func (d *dentry) checkDropLocked(ctx context.Context) {
if atomic.LoadInt64(&d.refs) != 0 {
return
}
+
+ // Make sure that we do not lose watches on dentries that have not been
+ // deleted. Note that overlayfs never calls VFS.InvalidateDentry(), so
+ // d.vfsd.IsDead() indicates that d was deleted.
+ if !d.vfsd.IsDead() && d.watches.Size() > 0 {
+ return
+ }
+
// Refs is still zero; destroy it.
d.destroyLocked(ctx)
return
@@ -549,6 +564,8 @@ func (d *dentry) destroyLocked(ctx context.Context) {
lowerVD.DecRef(ctx)
}
+ d.watches.HandleDeletion(ctx)
+
if d.parent != nil {
d.parent.dirMu.Lock()
if !d.vfsd.IsDead() {
@@ -567,19 +584,36 @@ func (d *dentry) destroyLocked(ctx context.Context) {
// InotifyWithParent implements vfs.DentryImpl.InotifyWithParent.
func (d *dentry) InotifyWithParent(ctx context.Context, events uint32, cookie uint32, et vfs.EventType) {
- // TODO(gvisor.dev/issue/1479): Implement inotify.
+ if d.isDir() {
+ events |= linux.IN_ISDIR
+ }
+
+ // overlayfs never calls VFS.InvalidateDentry(), so d.vfsd.IsDead() indicates
+ // that d was deleted.
+ deleted := d.vfsd.IsDead()
+
+ d.fs.renameMu.RLock()
+ // The ordering below is important, Linux always notifies the parent first.
+ if d.parent != nil {
+ d.parent.watches.Notify(ctx, d.name, events, cookie, et, deleted)
+ }
+ d.watches.Notify(ctx, "", events, cookie, et, deleted)
+ d.fs.renameMu.RUnlock()
}
// Watches implements vfs.DentryImpl.Watches.
func (d *dentry) Watches() *vfs.Watches {
- // TODO(gvisor.dev/issue/1479): Implement inotify.
- return nil
+ return &d.watches
}
// OnZeroWatches implements vfs.DentryImpl.OnZeroWatches.
-//
-// TODO(gvisor.dev/issue/1479): Implement inotify.
-func (d *dentry) OnZeroWatches(context.Context) {}
+func (d *dentry) OnZeroWatches(ctx context.Context) {
+ if atomic.LoadInt64(&d.refs) == 0 {
+ d.fs.renameMu.Lock()
+ d.checkDropLocked(ctx)
+ d.fs.renameMu.Unlock()
+ }
+}
// iterLayers invokes yield on each layer comprising d, from top to bottom. If
// any call to yield returns false, iterLayer stops iteration.
@@ -689,17 +723,33 @@ func (fd *fileDescription) GetXattr(ctx context.Context, opts vfs.GetXattrOption
// SetXattr implements vfs.FileDescriptionImpl.SetXattr.
func (fd *fileDescription) SetXattr(ctx context.Context, opts vfs.SetXattrOptions) error {
fs := fd.filesystem()
+ d := fd.dentry()
+
fs.renameMu.RLock()
- defer fs.renameMu.RUnlock()
- return fs.setXattrLocked(ctx, fd.dentry(), fd.vfsfd.Mount(), auth.CredentialsFromContext(ctx), &opts)
+ err := fs.setXattrLocked(ctx, d, fd.vfsfd.Mount(), auth.CredentialsFromContext(ctx), &opts)
+ fs.renameMu.RUnlock()
+ if err != nil {
+ return err
+ }
+
+ d.InotifyWithParent(ctx, linux.IN_ATTRIB, 0, vfs.InodeEvent)
+ return nil
}
// RemoveXattr implements vfs.FileDescriptionImpl.RemoveXattr.
func (fd *fileDescription) RemoveXattr(ctx context.Context, name string) error {
fs := fd.filesystem()
+ d := fd.dentry()
+
fs.renameMu.RLock()
- defer fs.renameMu.RUnlock()
- return fs.removeXattrLocked(ctx, fd.dentry(), fd.vfsfd.Mount(), auth.CredentialsFromContext(ctx), name)
+ err := fs.removeXattrLocked(ctx, d, fd.vfsfd.Mount(), auth.CredentialsFromContext(ctx), name)
+ fs.renameMu.RUnlock()
+ if err != nil {
+ return err
+ }
+
+ d.InotifyWithParent(ctx, linux.IN_ATTRIB, 0, vfs.InodeEvent)
+ return nil
}
// LockPOSIX implements vfs.FileDescriptionImpl.LockPOSIX.
diff --git a/pkg/sentry/fsimpl/overlay/overlay_state_autogen.go b/pkg/sentry/fsimpl/overlay/overlay_state_autogen.go
index 5fd2dc37e..d3e649672 100644
--- a/pkg/sentry/fsimpl/overlay/overlay_state_autogen.go
+++ b/pkg/sentry/fsimpl/overlay/overlay_state_autogen.go
@@ -185,6 +185,7 @@ func (x *dentry) StateFields() []string {
"wrappedMappable",
"isMappable",
"locks",
+ "watches",
}
}
@@ -215,6 +216,7 @@ func (x *dentry) StateSave(m state.Sink) {
m.Save(20, &x.wrappedMappable)
m.Save(21, &x.isMappable)
m.Save(22, &x.locks)
+ m.Save(23, &x.watches)
}
func (x *dentry) afterLoad() {}
@@ -243,6 +245,7 @@ func (x *dentry) StateLoad(m state.Source) {
m.Load(20, &x.wrappedMappable)
m.Load(21, &x.isMappable)
m.Load(22, &x.locks)
+ m.Load(23, &x.watches)
}
func (x *fileDescription) StateTypeName() string {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-14 22:12:00 +0000