rclone/cmd/mount/fs.go
2017-06-01 09:02:22 +01:00

104 lines
2.4 KiB
Go

// FUSE main Fs
// +build linux darwin freebsd
package mount
import (
"syscall"
"bazil.org/fuse"
fusefs "bazil.org/fuse/fs"
"github.com/ncw/rclone/cmd/mountlib"
"github.com/ncw/rclone/fs"
"github.com/pkg/errors"
"golang.org/x/net/context"
)
// FS represents the top level filing system
type FS struct {
*mountlib.FS
f fs.Fs
}
// Check interface satistfied
var _ fusefs.FS = (*FS)(nil)
// NewFS makes a new FS
func NewFS(f fs.Fs) *FS {
fsys := &FS{
FS: mountlib.NewFS(f),
f: f,
}
if noSeek {
fsys.FS.NoSeek()
}
if noChecksum {
fsys.FS.NoChecksum()
}
if readOnly {
fsys.FS.ReadOnly()
}
if pollInterval > 0 {
fsys.FS.PollChanges(pollInterval)
}
fsys.FS.SetDirCacheTime(dirCacheTime)
return fsys
}
// Root returns the root node
func (f *FS) Root() (node fusefs.Node, err error) {
defer fs.Trace("", "")("node=%+v, err=%v", &node, &err)
root, err := f.FS.Root()
if err != nil {
return nil, translateError(err)
}
return &Dir{root}, nil
}
// Check interface satsified
var _ fusefs.FSStatfser = (*FS)(nil)
// Statfs is called to obtain file system metadata.
// It should write that data to resp.
func (f *FS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) (err error) {
defer fs.Trace("", "")("stat=%+v, err=%v", resp, &err)
const blockSize = 4096
const fsBlocks = (1 << 50) / blockSize
resp.Blocks = fsBlocks // Total data blocks in file system.
resp.Bfree = fsBlocks // Free blocks in file system.
resp.Bavail = fsBlocks // Free blocks in file system if you're not root.
resp.Files = 1E9 // Total files in file system.
resp.Ffree = 1E9 // Free files in file system.
resp.Bsize = blockSize // Block size
resp.Namelen = 255 // Maximum file name length?
resp.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
return nil
}
// Translate errors from mountlib
func translateError(err error) error {
if err == nil {
return nil
}
cause := errors.Cause(err)
if mErr, ok := cause.(mountlib.Error); ok {
switch mErr {
case mountlib.OK:
return nil
case mountlib.ENOENT:
return fuse.ENOENT
case mountlib.ENOTEMPTY:
return fuse.Errno(syscall.ENOTEMPTY)
case mountlib.EEXIST:
return fuse.EEXIST
case mountlib.ESPIPE:
return fuse.Errno(syscall.ESPIPE)
case mountlib.EBADF:
return fuse.Errno(syscall.EBADF)
case mountlib.EROFS:
return fuse.Errno(syscall.EROFS)
}
}
return err
}