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54deb01f00
Before this change Open("name", os.O_RDONLY|os.O_TRUNC) would have
truncated the file. This is what Linux does, but is counterintuitive.
POSIX states this is undefined, so return an error in this case
instead. This preserves the invariant O_RDONLY => file is not
changed.
99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
// FUSE main Fs
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// +build linux darwin freebsd
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package mount
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import (
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"syscall"
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"bazil.org/fuse"
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fusefs "bazil.org/fuse/fs"
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"github.com/ncw/rclone/fs"
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"github.com/ncw/rclone/fs/log"
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"github.com/ncw/rclone/vfs"
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"github.com/ncw/rclone/vfs/vfsflags"
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"github.com/pkg/errors"
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"golang.org/x/net/context"
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)
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// FS represents the top level filing system
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type FS struct {
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*vfs.VFS
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f fs.Fs
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}
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// Check interface satistfied
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var _ fusefs.FS = (*FS)(nil)
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// NewFS makes a new FS
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func NewFS(f fs.Fs) *FS {
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fsys := &FS{
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VFS: vfs.New(f, &vfsflags.Opt),
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f: f,
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}
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return fsys
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}
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// Root returns the root node
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func (f *FS) Root() (node fusefs.Node, err error) {
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defer log.Trace("", "")("node=%+v, err=%v", &node, &err)
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root, err := f.VFS.Root()
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if err != nil {
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return nil, translateError(err)
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}
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return &Dir{root}, nil
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}
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// Check interface satsified
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var _ fusefs.FSStatfser = (*FS)(nil)
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// Statfs is called to obtain file system metadata.
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// It should write that data to resp.
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func (f *FS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) (err error) {
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defer log.Trace("", "")("stat=%+v, err=%v", resp, &err)
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const blockSize = 4096
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const fsBlocks = (1 << 50) / blockSize
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resp.Blocks = fsBlocks // Total data blocks in file system.
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resp.Bfree = fsBlocks // Free blocks in file system.
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resp.Bavail = fsBlocks // Free blocks in file system if you're not root.
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resp.Files = 1E9 // Total files in file system.
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resp.Ffree = 1E9 // Free files in file system.
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resp.Bsize = blockSize // Block size
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resp.Namelen = 255 // Maximum file name length?
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resp.Frsize = blockSize // Fragment size, smallest addressable data size in the file system.
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return nil
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}
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// Translate errors from mountlib
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func translateError(err error) error {
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if err == nil {
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return nil
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}
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switch errors.Cause(err) {
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case vfs.OK:
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return nil
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case vfs.ENOENT:
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return fuse.ENOENT
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case vfs.EEXIST:
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return fuse.EEXIST
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case vfs.EPERM:
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return fuse.EPERM
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case vfs.ECLOSED:
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return fuse.Errno(syscall.EBADF)
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case vfs.ENOTEMPTY:
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return fuse.Errno(syscall.ENOTEMPTY)
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case vfs.ESPIPE:
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return fuse.Errno(syscall.ESPIPE)
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case vfs.EBADF:
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return fuse.Errno(syscall.EBADF)
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case vfs.EROFS:
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return fuse.Errno(syscall.EROFS)
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case vfs.ENOSYS:
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return fuse.ENOSYS
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case vfs.EINVAL:
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return fuse.Errno(syscall.EINVAL)
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}
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return err
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}
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