mirror of
https://github.com/rclone/rclone.git
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268 lines
8.4 KiB
Go
268 lines
8.4 KiB
Go
//go:build linux || (darwin && amd64)
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// +build linux darwin,amd64
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// Package mount2 implements a FUSE mounting system for rclone remotes.
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package mount2
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import (
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"fmt"
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"log"
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"runtime"
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fusefs "github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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"github.com/rclone/rclone/cmd/mountlib"
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/vfs"
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)
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func init() {
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mountlib.NewMountCommand("mount2", true, mount)
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mountlib.AddRc("mount2", mount)
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}
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// mountOptions configures the options from the command line flags
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//
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// man mount.fuse for more info and note the -o flag for other options
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func mountOptions(fsys *FS, f fs.Fs, opt *mountlib.Options) (mountOpts *fuse.MountOptions) {
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mountOpts = &fuse.MountOptions{
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AllowOther: fsys.opt.AllowOther,
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FsName: opt.DeviceName,
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Name: "rclone",
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DisableXAttrs: true,
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Debug: fsys.opt.DebugFUSE,
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MaxReadAhead: int(fsys.opt.MaxReadAhead),
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MaxWrite: 1024 * 1024, // Linux v4.20+ caps requests at 1 MiB
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DisableReadDirPlus: true,
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// RememberInodes: true,
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// SingleThreaded: true,
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/*
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AllowOther bool
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// Options are passed as -o string to fusermount.
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Options []string
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// Default is _DEFAULT_BACKGROUND_TASKS, 12. This numbers
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// controls the allowed number of requests that relate to
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// async I/O. Concurrency for synchronous I/O is not limited.
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MaxBackground int
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// MaxWrite is the max size for read and write requests. If 0, use
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// go-fuse default (currently 64 kiB).
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// This number is internally capped at MAX_KERNEL_WRITE (higher values don't make
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// sense).
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//
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// Non-direct-io reads are mostly served via kernel readahead, which is
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// additionally subject to the MaxReadAhead limit.
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//
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// Implementation notes:
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//
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// There's four values the Linux kernel looks at when deciding the request size:
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// * MaxWrite, passed via InitOut.MaxWrite. Limits the WRITE size.
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// * max_read, passed via a string mount option. Limits the READ size.
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// go-fuse sets max_read equal to MaxWrite.
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// You can see the current max_read value in /proc/self/mounts .
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// * MaxPages, passed via InitOut.MaxPages. In Linux 4.20 and later, the value
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// can go up to 1 MiB and go-fuse calculates the MaxPages value acc.
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// to MaxWrite, rounding up.
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// On older kernels, the value is fixed at 128 kiB and the
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// passed value is ignored. No request can be larger than MaxPages, so
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// READ and WRITE are effectively capped at MaxPages.
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// * MaxReadAhead, passed via InitOut.MaxReadAhead.
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MaxWrite int
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// MaxReadAhead is the max read ahead size to use. It controls how much data the
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// kernel reads in advance to satisfy future read requests from applications.
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// How much exactly is subject to clever heuristics in the kernel
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// (see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/readahead.c?h=v6.2-rc5#n375
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// if you are brave) and hence also depends on the kernel version.
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//
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// If 0, use kernel default. This number is capped at the kernel maximum
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// (128 kiB on Linux) and cannot be larger than MaxWrite.
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//
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// MaxReadAhead only affects buffered reads (=non-direct-io), but even then, the
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// kernel can and does send larger reads to satisfy read reqests from applications
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// (up to MaxWrite or VM_READAHEAD_PAGES=128 kiB, whichever is less).
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MaxReadAhead int
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// If IgnoreSecurityLabels is set, all security related xattr
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// requests will return NO_DATA without passing through the
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// user defined filesystem. You should only set this if you
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// file system implements extended attributes, and you are not
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// interested in security labels.
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IgnoreSecurityLabels bool // ignoring labels should be provided as a fusermount mount option.
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// If RememberInodes is set, we will never forget inodes.
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// This may be useful for NFS.
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RememberInodes bool
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// Values shown in "df -T" and friends
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// First column, "Filesystem"
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FsName string
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// Second column, "Type", will be shown as "fuse." + Name
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Name string
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// If set, wrap the file system in a single-threaded locking wrapper.
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SingleThreaded bool
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// If set, return ENOSYS for Getxattr calls, so the kernel does not issue any
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// Xattr operations at all.
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DisableXAttrs bool
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// If set, print debugging information.
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Debug bool
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// If set, ask kernel to forward file locks to FUSE. If using,
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// you must implement the GetLk/SetLk/SetLkw methods.
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EnableLocks bool
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// If set, the kernel caches all Readlink return values. The
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// filesystem must use content notification to force the
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// kernel to issue a new Readlink call.
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EnableSymlinkCaching bool
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// If set, ask kernel not to do automatic data cache invalidation.
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// The filesystem is fully responsible for invalidating data cache.
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ExplicitDataCacheControl bool
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// Disable ReadDirPlus capability so ReadDir is used instead. Simple
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// directory queries (i.e. 'ls' without '-l') can be faster with
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// ReadDir, as no per-file stat calls are needed
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DisableReadDirPlus bool
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*/
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}
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var opts []string
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// FIXME doesn't work opts = append(opts, fmt.Sprintf("max_readahead=%d", maxReadAhead))
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if fsys.opt.AllowOther {
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opts = append(opts, "allow_other")
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}
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if fsys.opt.AllowRoot {
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opts = append(opts, "allow_root")
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}
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if fsys.opt.DefaultPermissions {
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opts = append(opts, "default_permissions")
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}
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if fsys.VFS.Opt.ReadOnly {
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opts = append(opts, "ro")
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}
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if fsys.opt.WritebackCache {
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log.Printf("FIXME --write-back-cache not supported")
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// FIXME opts = append(opts,fuse.WritebackCache())
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}
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// Some OS X only options
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if runtime.GOOS == "darwin" {
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opts = append(opts,
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// VolumeName sets the volume name shown in Finder.
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fmt.Sprintf("volname=%s", opt.VolumeName),
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// NoAppleXattr makes OSXFUSE disallow extended attributes with the
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// prefix "com.apple.". This disables persistent Finder state and
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// other such information.
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"noapplexattr",
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// NoAppleDouble makes OSXFUSE disallow files with names used by OS X
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// to store extended attributes on file systems that do not support
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// them natively.
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//
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// Such file names are:
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//
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// ._*
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// .DS_Store
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"noappledouble",
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)
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}
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mountOpts.Options = opts
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return mountOpts
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}
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// mount the file system
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//
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// The mount point will be ready when this returns.
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//
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// returns an error, and an error channel for the serve process to
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// report an error when fusermount is called.
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func mount(VFS *vfs.VFS, mountpoint string, opt *mountlib.Options) (<-chan error, func() error, error) {
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f := VFS.Fs()
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if err := mountlib.CheckOverlap(f, mountpoint); err != nil {
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return nil, nil, err
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}
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if err := mountlib.CheckAllowNonEmpty(mountpoint, opt); err != nil {
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return nil, nil, err
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}
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fs.Debugf(f, "Mounting on %q", mountpoint)
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fsys := NewFS(VFS, opt)
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// nodeFsOpts := &fusefs.PathNodeFsOptions{
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// ClientInodes: false,
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// Debug: mountlib.DebugFUSE,
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// }
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// nodeFs := fusefs.NewPathNodeFs(fsys, nodeFsOpts)
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//mOpts := fusefs.NewOptions() // default options
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// FIXME
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// mOpts.EntryTimeout = 10 * time.Second
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// mOpts.AttrTimeout = 10 * time.Second
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// mOpts.NegativeTimeout = 10 * time.Second
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//mOpts.Debug = mountlib.DebugFUSE
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//conn := fusefs.NewFileSystemConnector(nodeFs.Root(), mOpts)
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mountOpts := mountOptions(fsys, f, opt)
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// FIXME fill out
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opts := fusefs.Options{
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MountOptions: *mountOpts,
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EntryTimeout: &opt.AttrTimeout,
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AttrTimeout: &opt.AttrTimeout,
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GID: VFS.Opt.GID,
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UID: VFS.Opt.UID,
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}
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root, err := fsys.Root()
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if err != nil {
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return nil, nil, err
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}
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rawFS := fusefs.NewNodeFS(root, &opts)
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server, err := fuse.NewServer(rawFS, mountpoint, &opts.MountOptions)
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if err != nil {
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return nil, nil, err
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}
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//mountOpts := &fuse.MountOptions{}
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//server, err := fusefs.Mount(mountpoint, fsys, &opts)
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// server, err := fusefs.Mount(mountpoint, root, &opts)
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// if err != nil {
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// return nil, nil, err
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// }
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umount := func() error {
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// Shutdown the VFS
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fsys.VFS.Shutdown()
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return server.Unmount()
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}
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// serverSettings := server.KernelSettings()
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// fs.Debugf(f, "Server settings %+v", serverSettings)
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// Serve the mount point in the background returning error to errChan
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errs := make(chan error, 1)
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go func() {
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server.Serve()
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errs <- nil
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}()
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fs.Debugf(f, "Waiting for the mount to start...")
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err = server.WaitMount()
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if err != nil {
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return nil, nil, err
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}
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fs.Debugf(f, "Mount started")
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return errs, umount, nil
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}
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