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authorJakob Unterwurzacher2020-06-21 14:08:53 +0200
committerJakob Unterwurzacher2020-06-21 14:08:53 +0200
commit1618fbbac56c97e2ffbcabeee2dcc3d4ae62683e (patch)
treeba4789b083dd0eaa742a9372ec0e4a2155b414bb
parentcc0b94a3c58c942250c0b2728c2d95123b0decf1 (diff)
v2api: implement Unlink
-rw-r--r--internal/fusefrontend/node.go36
-rw-r--r--internal/fusefrontend/node_api_check.go2
-rw-r--r--internal/fusefrontend/node_dir_ops.go4
3 files changed, 42 insertions, 0 deletions
diff --git a/internal/fusefrontend/node.go b/internal/fusefrontend/node.go
index 28e606a..5753053 100644
--- a/internal/fusefrontend/node.go
+++ b/internal/fusefrontend/node.go
@@ -31,6 +31,7 @@ func (n *Node) rootNode() *RootNode {
return n.Root().Operations().(*RootNode)
}
+// Lookup - FUSE call for discovering a file.
func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
rn := n.rootNode()
p := filepath.Join(n.path(), name)
@@ -61,6 +62,9 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs
return ch, 0
}
+// GetAttr - FUSE call for stat()ing a file.
+//
+// GetAttr is symlink-safe through use of openBackingDir() and Fstatat().
func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
rn := n.rootNode()
dirfd, cName, err := rn.openBackingDir(n.path())
@@ -78,6 +82,9 @@ func (n *Node) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut)
return 0
}
+// Create - FUSE call. Creates a new file.
+//
+// Symlink-safe through the use of Openat().
func (n *Node) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (inode *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
rn := n.rootNode()
path := filepath.Join(n.path(), name)
@@ -142,3 +149,32 @@ func (n *Node) Create(ctx context.Context, name string, flags uint32, mode uint3
f := os.NewFile(uintptr(fd), cName)
return ch, NewFile2(f, rn, st), 0, 0
}
+
+// Unlink - FUSE call. Delete a file.
+//
+// Symlink-safe through use of Unlinkat().
+func (n *Node) Unlink(ctx context.Context, name string) syscall.Errno {
+ rn := n.rootNode()
+ p := filepath.Join(n.path(), name)
+ if rn.isFiltered(p) {
+ return syscall.EPERM
+ }
+ dirfd, cName, err := rn.openBackingDir(p)
+ if err != nil {
+ return fs.ToErrno(err)
+ }
+ defer syscall.Close(dirfd)
+ // Delete content
+ err = syscallcompat.Unlinkat(dirfd, cName, 0)
+ if err != nil {
+ return fs.ToErrno(err)
+ }
+ // Delete ".name" file
+ if !rn.args.PlaintextNames && nametransform.IsLongContent(cName) {
+ err = nametransform.DeleteLongNameAt(dirfd, cName)
+ if err != nil {
+ tlog.Warn.Printf("Unlink: could not delete .name file: %v", err)
+ }
+ }
+ return fs.ToErrno(err)
+}
diff --git a/internal/fusefrontend/node_api_check.go b/internal/fusefrontend/node_api_check.go
index 8b3eef1..dcf62d3 100644
--- a/internal/fusefrontend/node_api_check.go
+++ b/internal/fusefrontend/node_api_check.go
@@ -4,9 +4,11 @@ import (
"github.com/hanwen/go-fuse/v2/fs"
)
+// Check that we have implemented the interfaces
var _ = (fs.NodeGetattrer)((*Node)(nil))
var _ = (fs.NodeLookuper)((*Node)(nil))
var _ = (fs.NodeReaddirer)((*Node)(nil))
var _ = (fs.NodeCreater)((*Node)(nil))
var _ = (fs.NodeMkdirer)((*Node)(nil))
var _ = (fs.NodeRmdirer)((*Node)(nil))
+var _ = (fs.NodeUnlinker)((*Node)(nil))
diff --git a/internal/fusefrontend/node_dir_ops.go b/internal/fusefrontend/node_dir_ops.go
index b4bce1b..8aa79ba 100644
--- a/internal/fusefrontend/node_dir_ops.go
+++ b/internal/fusefrontend/node_dir_ops.go
@@ -139,6 +139,10 @@ func (n *Node) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.En
return ch, 0
}
+// Readdir - FUSE call.
+//
+// This function is symlink-safe through use of openBackingDir() and
+// ReadDirIVAt().
func (n *Node) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
rn := n.rootNode()
p := n.path()