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cmount: fix Getattr to work on directories

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This commit is contained in:
Nick Craig-Wood 2017-05-08 14:56:15 +01:00
parent 6a8e4690d3
commit b179540e80
1 changed files with 29 additions and 22 deletions
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51
cmd/cmount/fs.go
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@ -47,7 +47,7 @@ func NewFS(f fs.Fs) *FS {
type OpenFiles struct {
mu sync.Mutex
mark uint8
nodes []interface{}
nodes []mountlib.Noder
}
func NewOpenFiles(mark uint8) *OpenFiles {
@ -57,11 +57,11 @@ func NewOpenFiles(mark uint8) *OpenFiles {
}
// Open a node returning a file handle
func (of *OpenFiles) Open(node interface{}) (fh uint64) {
func (of *OpenFiles) Open(node mountlib.Noder) (fh uint64) {
of.mu.Lock()
defer of.mu.Unlock()
var i int
var oldNode interface{}
var oldNode mountlib.Noder
for i, oldNode = range of.nodes {
if oldNode == nil {
of.nodes[i] = node
@ -74,26 +74,34 @@ found:
return uint64((i << 8) | int(of.mark))
}
// InRange to see if this fh could be one of ours
func (of *OpenFiles) InRange(fh uint64) bool {
return uint8(fh) == of.mark
}
// get the node for fh, call with the lock held
func (of *OpenFiles) get(fh uint64) (i int, node interface{}, errc int) {
func (of *OpenFiles) get(fh uint64) (i int, node mountlib.Noder, errc int) {
receivedMark := uint8(fh)
if receivedMark != of.mark {
fs.Debugf(nil, "Bad file handle: bad mark 0x%X != 0x%X: 0x%X", receivedMark, of.mark, fh)
return i, nil, -fuse.EBADF
}
i64 := fh >> 8
if i64 > uint64(len(of.nodes)) {
fs.Debugf(nil, "Bad file handle: too big: 0x%X", fh)
return i, nil, -fuse.EBADF
}
i = int(i64)
node = of.nodes[i]
if node == nil {
fs.Debugf(nil, "Bad file handle: nil node: 0x%X", fh)
return i, nil, -fuse.EBADF
}
return i, node, 0
}
// Get the node for the file handle
func (of *OpenFiles) Get(fh uint64) (node interface{}, errc int) {
func (of *OpenFiles) Get(fh uint64) (node mountlib.Noder, errc int) {
of.mu.Lock()
_, node, errc = of.get(fh)
of.mu.Unlock()
@ -150,13 +158,17 @@ func (fsys *FS) lookupFile(path string) (file *mountlib.File, errc int) {
return file, 0
}
// get a read or write file handle
func (fsys *FS) getReadOrWriteFh(fh uint64) (handle interface{}, errc int) {
handle, errc = fsys.openFilesRd.Get(fh)
if errc == 0 {
return
// Get the underlying handle from the file handle
func (fsys *FS) getHandleFromFh(fh uint64) (handle mountlib.Noder, errc int) {
switch {
case fsys.openFilesRd.InRange(fh):
return fsys.openFilesRd.Get(fh)
case fsys.openFilesWr.InRange(fh):
return fsys.openFilesWr.Get(fh)
case fsys.openDirs.InRange(fh):
return fsys.openDirs.Get(fh)
}
return fsys.openFilesWr.Get(fh)
return nil, -fuse.EBADF
}
// get a node from the path or from the fh if not fhUnset
@ -164,15 +176,10 @@ func (fsys *FS) getNode(path string, fh uint64) (node mountlib.Node, errc int) {
if fh == fhUnset {
node, errc = fsys.lookupNode(path)
} else {
var n interface{}
n, errc = fsys.getReadOrWriteFh(fh)
var n mountlib.Noder
n, errc = fsys.getHandleFromFh(fh)
if errc == 0 {
if get, ok := n.(mountlib.Noder); ok {
node = get.Node()
} else {
fs.Errorf(path, "Bad node type %T", n)
errc = -fuse.EIO
}
node = n.Node()
}
}
return
@ -324,7 +331,7 @@ func (fsys *FS) Open(path string, flags int) (errc int, fh uint64) {
}
rdwrMode := flags & fuse.O_ACCMODE
var err error
var handle interface{}
var handle mountlib.Noder
switch {
case rdwrMode == fuse.O_RDONLY:
handle, err = file.OpenRead()
@ -420,7 +427,7 @@ func (fsys *FS) Write(path string, buff []byte, ofst int64, fh uint64) (n int) {
}
func (fsys *FS) Flush(path string, fh uint64) (errc int) {
handle, errc := fsys.getReadOrWriteFh(fh)
handle, errc := fsys.getHandleFromFh(fh)
if errc != 0 {
return errc
}
@ -437,7 +444,7 @@ func (fsys *FS) Flush(path string, fh uint64) (errc int) {
}
func (fsys *FS) Release(path string, fh uint64) (errc int) {
handle, errc := fsys.getReadOrWriteFh(fh)
handle, errc := fsys.getHandleFromFh(fh)
if errc != 0 {
return errc
}