vfs: factor Open logic from Dir.Create into vfs.OpenFile

This commit is contained in:
Nick Craig-Wood 2017-11-06 12:22:45 +00:00
parent 46947b3b9b
commit 3fb1e96988
6 changed files with 39 additions and 34 deletions

View file

@ -298,7 +298,11 @@ func (fsys *FS) Create(filePath string, flags int, mode uint32) (errc int, fh ui
if errc != 0 { if errc != 0 {
return errc, fhUnset return errc, fhUnset
} }
_, handle, err := parentDir.Create(leaf) file, err := parentDir.Create(leaf)
if err != nil {
return translateError(err), fhUnset
}
handle, err := file.Open(flags)
if err != nil { if err != nil {
return translateError(err), fhUnset return translateError(err), fhUnset
} }

View file

@ -122,7 +122,11 @@ var _ fusefs.NodeCreater = (*Dir)(nil)
// Create makes a new file // Create makes a new file
func (d *Dir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (node fusefs.Node, handle fusefs.Handle, err error) { func (d *Dir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (node fusefs.Node, handle fusefs.Handle, err error) {
defer fs.Trace(d, "name=%q", req.Name)("node=%v, handle=%v, err=%v", &node, &handle, &err) defer fs.Trace(d, "name=%q", req.Name)("node=%v, handle=%v, err=%v", &node, &handle, &err)
file, fh, err := d.Dir.Create(req.Name) file, err := d.Dir.Create(req.Name)
if err != nil {
return nil, nil, translateError(err)
}
fh, err := file.Open(int(req.Flags))
if err != nil { if err != nil {
return nil, nil, translateError(err) return nil, nil, translateError(err)
} }

View file

@ -316,23 +316,14 @@ func (d *Dir) Open(flags int) (fd Handle, err error) {
return newDirHandle(d), nil return newDirHandle(d), nil
} }
// Create makes a new file // Create makes a new file node
func (d *Dir) Create(name string) (*File, *WriteFileHandle, error) { func (d *Dir) Create(name string) (*File, error) {
if d.vfs.Opt.ReadOnly {
return nil, nil, EROFS
}
path := path.Join(d.path, name)
// fs.Debugf(path, "Dir.Create") // fs.Debugf(path, "Dir.Create")
src := newCreateInfo(d.f, path) if d.vfs.Opt.ReadOnly {
// This gets added to the directory when the file is written return nil, EROFS
file := newFile(d, nil, name)
fh, err := newWriteFileHandle(d, file, src)
if err != nil {
fs.Errorf(d, "Dir.Create error: %v", err)
return nil, nil, err
} }
// fs.Debugf(path, "Dir.Create OK") // This gets added to the directory when the file is written
return file, fh, nil return newFile(d, nil, name), nil
} }
// Mkdir creates a new directory // Mkdir creates a new directory

View file

@ -278,10 +278,13 @@ func TestDirCreate(t *testing.T) {
defer r.Finalise() defer r.Finalise()
vfs, dir, _ := dirCreate(t, r) vfs, dir, _ := dirCreate(t, r)
file, fd, err := dir.Create("potato") file, err := dir.Create("potato")
require.NoError(t, err) require.NoError(t, err)
assert.Equal(t, int64(0), file.Size()) assert.Equal(t, int64(0), file.Size())
fd, err := file.Open(os.O_WRONLY)
require.NoError(t, err)
// FIXME Note that this fails with the current implementation // FIXME Note that this fails with the current implementation
// until the file has been opened. // until the file has been opened.
@ -300,7 +303,7 @@ func TestDirCreate(t *testing.T) {
assert.Equal(t, int64(5), file2.Size()) assert.Equal(t, int64(5), file2.Size())
vfs.Opt.ReadOnly = true vfs.Opt.ReadOnly = true
_, _, err = dir.Create("sausage") _, err = dir.Create("sausage")
assert.Equal(t, EROFS, err) assert.Equal(t, EROFS, err)
} }

View file

@ -33,12 +33,17 @@ func newFile(d *Dir, o fs.Object, leaf string) *File {
} }
} }
// path returns the full path of the file
func (f *File) path() string {
return path.Join(f.d.path, f.leaf)
}
// String converts it to printable // String converts it to printable
func (f *File) String() string { func (f *File) String() string {
if f == nil { if f == nil {
return "<nil *File>" return "<nil *File>"
} }
return path.Join(f.d.path, f.leaf) return f.path()
} }
// IsFile returns true for File - satisfies Node interface // IsFile returns true for File - satisfies Node interface
@ -228,14 +233,9 @@ func (f *File) OpenWrite() (fh *WriteFileHandle, err error) {
if f.d.vfs.Opt.ReadOnly { if f.d.vfs.Opt.ReadOnly {
return nil, EROFS return nil, EROFS
} }
// if o is nil it isn't valid yet
o, err := f.waitForValidObject()
if err != nil {
return nil, err
}
// fs.Debugf(o, "File.OpenWrite") // fs.Debugf(o, "File.OpenWrite")
src := newCreateInfo(f.d.f, o.Remote()) src := newCreateInfo(f.d.f, f.path())
fh, err = newWriteFileHandle(f.d, f, src) fh, err = newWriteFileHandle(f.d, f, src)
err = errors.Wrap(err, "open for write") err = errors.Wrap(err, "open for write")

View file

@ -266,15 +266,18 @@ func (vfs *VFS) StatParent(name string) (dir *Dir, leaf string, err error) {
func (vfs *VFS) OpenFile(name string, flags int, perm os.FileMode) (fd Handle, err error) { func (vfs *VFS) OpenFile(name string, flags int, perm os.FileMode) (fd Handle, err error) {
node, err := vfs.Stat(name) node, err := vfs.Stat(name)
if err != nil { if err != nil {
if err == ENOENT && flags&os.O_CREATE != 0 { if err != ENOENT || flags&os.O_CREATE == 0 {
dir, leaf, err := vfs.StatParent(name) return nil, err
if err != nil { }
return nil, err // If not found and O_CREATE then create the file
} dir, leaf, err := vfs.StatParent(name)
_, fd, err = dir.Create(leaf) if err != nil {
return fd, err return nil, err
}
node, err = dir.Create(leaf)
if err != nil {
return nil, err
} }
return nil, err
} }
return node.Open(flags) return node.Open(flags)
} }