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cmount: translate FUSE open flags into OS flags

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On Windows the fuse.O_* flags do not have the same values as the
os.O_* flags so translate between the two representations.  They are
mostly the same which is why this hasn't caused a problem before.
This commit is contained in:
Nick Craig-Wood 2017-11-16 09:27:26 +00:00
parent e7f2935333
commit 94adf4f43b
1 changed files with 30 additions and 2 deletions
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32
cmd/cmount/fs.go
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@ -282,8 +282,8 @@ func (fsys *FS) Statfs(path string, stat *fuse.Statfs_t) (errc int) {
func (fsys *FS) Open(path string, flags int) (errc int, fh uint64) {
defer fs.Trace(path, "flags=0x%X", flags)("errc=%d, fh=0x%X", &errc, &fh)
// fuse flags are based off syscall flags as are os flags, so
// should be compatible
// translate the fuse flags to os flags
flags = translateOpenFlags(flags)
handle, err := fsys.VFS.OpenFile(path, flags, 0777)
if errc != 0 {
return translateError(err), fhUnset
@ -303,6 +303,8 @@ func (fsys *FS) Create(filePath string, flags int, mode uint32) (errc int, fh ui
if err != nil {
return translateError(err), fhUnset
}
// translate the fuse flags to os flags
flags = translateOpenFlags(flags)
handle, err := file.Open(flags)
if err != nil {
return translateError(err), fhUnset
@ -556,3 +558,29 @@ func translateError(err error) (errc int) {
fs.Errorf(nil, "IO error: %v", err)
return -fuse.EIO
}
// Translate Open Flags from FUSE to os (as used in the vfs layer)
func translateOpenFlags(inFlags int) (outFlags int) {
switch inFlags & fuse.O_ACCMODE {
case fuse.O_RDONLY:
outFlags = os.O_RDONLY
case fuse.O_WRONLY:
outFlags = os.O_WRONLY
case fuse.O_RDWR:
outFlags = os.O_RDWR
}
if inFlags&fuse.O_APPEND != 0 {
outFlags |= os.O_APPEND
}
if inFlags&fuse.O_CREAT != 0 {
outFlags |= os.O_CREATE
}
if inFlags&fuse.O_EXCL != 0 {
outFlags |= os.O_EXCL
}
if inFlags&fuse.O_TRUNC != 0 {
outFlags |= os.O_TRUNC
}
// NB O_SYNC isn't defined by fuse
return outFlags
}