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cmount: support --mount-tpslimit flag
See: https://forum.rclone.org/t/mac-os-big-sur-mount-error/21726
This commit is contained in:
Nick Craig-Wood
parent
a662d17105
commit
cbe049b520
@ -5,6 +5,7 @@
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package cmount
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import (
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"context"
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"io"
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"os"
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"path"
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@ -18,9 +19,11 @@ import (
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"github.com/rclone/rclone/fs"
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"github.com/rclone/rclone/fs/log"
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"github.com/rclone/rclone/vfs"
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"golang.org/x/time/rate"
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)
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const fhUnset = ^uint64(0)
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const tpsBurst = 100
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// FS represents the top level filing system
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type FS struct {
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@ -29,19 +32,31 @@ type FS struct {
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ready chan (struct{})
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mu sync.Mutex // to protect the below
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handles []vfs.Handle
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destroyed int32 // read/write with sync/atomic
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destroyed int32 // read/write with sync/atomic
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tps *rate.Limiter // for limiting number of transactions per second
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}
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// NewFS makes a new FS
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func NewFS(VFS *vfs.VFS) *FS {
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func NewFS(VFS *vfs.VFS, opt *mountlib.Options) *FS {
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fsys := &FS{
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VFS: VFS,
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f: VFS.Fs(),
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ready: make(chan (struct{})),
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}
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if opt.TPSLimit > 0 {
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fsys.tps = rate.NewLimiter(rate.Limit(opt.TPSLimit), tpsBurst)
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fs.Infof(nil, "Starting mount transaction limiter: max %g transactions/s with burst %d", opt.TPSLimit, tpsBurst)
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}
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return fsys
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}
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// Limit the number of transactions per second
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func (fsys *FS) rateLimit() {
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if fsys.tps != nil {
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_ = fsys.tps.Wait(context.Background())
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}
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}
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// Open a handle returning an integer file handle
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func (fsys *FS) openHandle(handle vfs.Handle) (fh uint64) {
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fsys.mu.Lock()
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@ -195,6 +210,7 @@ func (fsys *FS) Destroy() {
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// Getattr reads the attributes for path
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func (fsys *FS) Getattr(path string, stat *fuse.Stat_t, fh uint64) (errc int) {
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defer log.Trace(path, "fh=0x%X", fh)("errc=%v", &errc)
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fsys.rateLimit()
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node, _, errc := fsys.getNode(path, fh)
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if errc == 0 {
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errc = fsys.stat(node, stat)
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@ -205,6 +221,7 @@ func (fsys *FS) Getattr(path string, stat *fuse.Stat_t, fh uint64) (errc int) {
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// Opendir opens path as a directory
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func (fsys *FS) Opendir(path string) (errc int, fh uint64) {
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defer log.Trace(path, "")("errc=%d, fh=0x%X", &errc, &fh)
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fsys.rateLimit()
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handle, err := fsys.VFS.OpenFile(path, os.O_RDONLY, 0777)
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if err != nil {
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return translateError(err), fhUnset
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@ -219,6 +236,7 @@ func (fsys *FS) Readdir(dirPath string,
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fh uint64) (errc int) {
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itemsRead := -1
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defer log.Trace(dirPath, "ofst=%d, fh=0x%X", ofst, fh)("items=%d, errc=%d", &itemsRead, &errc)
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fsys.rateLimit()
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dir, errc := fsys.lookupDir(dirPath)
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if errc != 0 {
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@ -270,12 +288,14 @@ func (fsys *FS) Readdir(dirPath string,
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// Releasedir finished reading the directory
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func (fsys *FS) Releasedir(path string, fh uint64) (errc int) {
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defer log.Trace(path, "fh=0x%X", fh)("errc=%d", &errc)
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fsys.rateLimit()
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return fsys.closeHandle(fh)
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}
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// Statfs reads overall stats on the filesystem
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func (fsys *FS) Statfs(path string, stat *fuse.Statfs_t) (errc int) {
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defer log.Trace(path, "")("stat=%+v, errc=%d", stat, &errc)
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fsys.rateLimit()
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const blockSize = 4096
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total, _, free := fsys.VFS.Statfs()
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stat.Blocks = uint64(total) / blockSize // Total data blocks in file system.
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@ -295,6 +315,7 @@ func (fsys *FS) Statfs(path string, stat *fuse.Statfs_t) (errc int) {
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// OpenEx opens a file
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func (fsys *FS) OpenEx(path string, fi *fuse.FileInfo_t) (errc int) {
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defer log.Trace(path, "flags=0x%X", fi.Flags)("errc=%d, fh=0x%X", &errc, &fi.Fh)
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fsys.rateLimit()
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fi.Fh = fhUnset
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// translate the fuse flags to os flags
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@ -325,6 +346,7 @@ func (fsys *FS) Open(path string, flags int) (errc int, fh uint64) {
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// CreateEx creates and opens a file.
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func (fsys *FS) CreateEx(filePath string, mode uint32, fi *fuse.FileInfo_t) (errc int) {
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defer log.Trace(filePath, "flags=0x%X, mode=0%o", fi.Flags, mode)("errc=%d, fh=0x%X", &errc, &fi.Fh)
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fsys.rateLimit()
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fi.Fh = fhUnset
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leaf, parentDir, errc := fsys.lookupParentDir(filePath)
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if errc != 0 {
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@ -356,6 +378,7 @@ func (fsys *FS) Create(filePath string, flags int, mode uint32) (errc int, fh ui
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// Truncate truncates a file to size
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func (fsys *FS) Truncate(path string, size int64, fh uint64) (errc int) {
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defer log.Trace(path, "size=%d, fh=0x%X", size, fh)("errc=%d", &errc)
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fsys.rateLimit()
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node, handle, errc := fsys.getNode(path, fh)
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if errc != 0 {
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return errc
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@ -375,6 +398,7 @@ func (fsys *FS) Truncate(path string, size int64, fh uint64) (errc int) {
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// Read data from file handle
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func (fsys *FS) Read(path string, buff []byte, ofst int64, fh uint64) (n int) {
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defer log.Trace(path, "ofst=%d, fh=0x%X", ofst, fh)("n=%d", &n)
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fsys.rateLimit()
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handle, errc := fsys.getHandle(fh)
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if errc != 0 {
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return errc
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@ -390,6 +414,7 @@ func (fsys *FS) Read(path string, buff []byte, ofst int64, fh uint64) (n int) {
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// Write data to file handle
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func (fsys *FS) Write(path string, buff []byte, ofst int64, fh uint64) (n int) {
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defer log.Trace(path, "ofst=%d, fh=0x%X", ofst, fh)("n=%d", &n)
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fsys.rateLimit()
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handle, errc := fsys.getHandle(fh)
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if errc != 0 {
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return errc
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@ -404,6 +429,7 @@ func (fsys *FS) Write(path string, buff []byte, ofst int64, fh uint64) (n int) {
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// Flush flushes an open file descriptor or path
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func (fsys *FS) Flush(path string, fh uint64) (errc int) {
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defer log.Trace(path, "fh=0x%X", fh)("errc=%d", &errc)
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fsys.rateLimit()
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handle, errc := fsys.getHandle(fh)
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if errc != 0 {
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return errc
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@ -414,6 +440,7 @@ func (fsys *FS) Flush(path string, fh uint64) (errc int) {
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// Release closes the file if still open
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func (fsys *FS) Release(path string, fh uint64) (errc int) {
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defer log.Trace(path, "fh=0x%X", fh)("errc=%d", &errc)
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fsys.rateLimit()
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handle, errc := fsys.getHandle(fh)
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if errc != 0 {
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return errc
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@ -425,6 +452,7 @@ func (fsys *FS) Release(path string, fh uint64) (errc int) {
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// Unlink removes a file.
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func (fsys *FS) Unlink(filePath string) (errc int) {
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defer log.Trace(filePath, "")("errc=%d", &errc)
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fsys.rateLimit()
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leaf, parentDir, errc := fsys.lookupParentDir(filePath)
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if errc != 0 {
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return errc
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@ -435,6 +463,7 @@ func (fsys *FS) Unlink(filePath string) (errc int) {
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// Mkdir creates a directory.
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func (fsys *FS) Mkdir(dirPath string, mode uint32) (errc int) {
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defer log.Trace(dirPath, "mode=0%o", mode)("errc=%d", &errc)
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fsys.rateLimit()
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leaf, parentDir, errc := fsys.lookupParentDir(dirPath)
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if errc != 0 {
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return errc
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@ -446,6 +475,7 @@ func (fsys *FS) Mkdir(dirPath string, mode uint32) (errc int) {
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// Rmdir removes a directory
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func (fsys *FS) Rmdir(dirPath string) (errc int) {
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defer log.Trace(dirPath, "")("errc=%d", &errc)
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fsys.rateLimit()
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leaf, parentDir, errc := fsys.lookupParentDir(dirPath)
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if errc != 0 {
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return errc
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@ -456,6 +486,7 @@ func (fsys *FS) Rmdir(dirPath string) (errc int) {
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// Rename renames a file.
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func (fsys *FS) Rename(oldPath string, newPath string) (errc int) {
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defer log.Trace(oldPath, "newPath=%q", newPath)("errc=%d", &errc)
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fsys.rateLimit()
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return translateError(fsys.VFS.Rename(oldPath, newPath))
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}
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@ -467,6 +498,7 @@ var invalidDateCutoff = time.Date(1601, 1, 2, 0, 0, 0, 0, time.UTC)
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// Utimens changes the access and modification times of a file.
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func (fsys *FS) Utimens(path string, tmsp []fuse.Timespec) (errc int) {
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defer log.Trace(path, "tmsp=%+v", tmsp)("errc=%d", &errc)
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fsys.rateLimit()
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node, errc := fsys.lookupNode(path)
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if errc != 0 {
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return errc
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@ -487,12 +519,14 @@ func (fsys *FS) Utimens(path string, tmsp []fuse.Timespec) (errc int) {
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// Mknod creates a file node.
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func (fsys *FS) Mknod(path string, mode uint32, dev uint64) (errc int) {
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defer log.Trace(path, "mode=0x%X, dev=0x%X", mode, dev)("errc=%d", &errc)
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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// Fsync synchronizes file contents.
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func (fsys *FS) Fsync(path string, datasync bool, fh uint64) (errc int) {
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defer log.Trace(path, "datasync=%v, fh=0x%X", datasync, fh)("errc=%d", &errc)
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fsys.rateLimit()
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// This is a no-op for rclone
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return 0
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}
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@ -500,24 +534,28 @@ func (fsys *FS) Fsync(path string, datasync bool, fh uint64) (errc int) {
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// Link creates a hard link to a file.
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func (fsys *FS) Link(oldpath string, newpath string) (errc int) {
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defer log.Trace(oldpath, "newpath=%q", newpath)("errc=%d", &errc)
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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// Symlink creates a symbolic link.
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func (fsys *FS) Symlink(target string, newpath string) (errc int) {
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defer log.Trace(target, "newpath=%q", newpath)("errc=%d", &errc)
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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// Readlink reads the target of a symbolic link.
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func (fsys *FS) Readlink(path string) (errc int, linkPath string) {
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defer log.Trace(path, "")("linkPath=%q, errc=%d", &linkPath, &errc)
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fsys.rateLimit()
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return -fuse.ENOSYS, ""
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}
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// Chmod changes the permission bits of a file.
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func (fsys *FS) Chmod(path string, mode uint32) (errc int) {
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defer log.Trace(path, "mode=0%o", mode)("errc=%d", &errc)
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fsys.rateLimit()
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// This is a no-op for rclone
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return 0
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}
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@ -525,6 +563,7 @@ func (fsys *FS) Chmod(path string, mode uint32) (errc int) {
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// Chown changes the owner and group of a file.
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func (fsys *FS) Chown(path string, uid uint32, gid uint32) (errc int) {
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defer log.Trace(path, "uid=%d, gid=%d", uid, gid)("errc=%d", &errc)
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fsys.rateLimit()
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// This is a no-op for rclone
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return 0
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}
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@ -532,6 +571,7 @@ func (fsys *FS) Chown(path string, uid uint32, gid uint32) (errc int) {
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// Access checks file access permissions.
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func (fsys *FS) Access(path string, mask uint32) (errc int) {
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defer log.Trace(path, "mask=0%o", mask)("errc=%d", &errc)
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fsys.rateLimit()
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// This is a no-op for rclone
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return 0
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}
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@ -539,27 +579,32 @@ func (fsys *FS) Access(path string, mask uint32) (errc int) {
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// Fsyncdir synchronizes directory contents.
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func (fsys *FS) Fsyncdir(path string, datasync bool, fh uint64) (errc int) {
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defer log.Trace(path, "datasync=%v, fh=0x%X", datasync, fh)("errc=%d", &errc)
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fsys.rateLimit()
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// This is a no-op for rclone
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return 0
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}
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// Setxattr sets extended attributes.
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func (fsys *FS) Setxattr(path string, name string, value []byte, flags int) (errc int) {
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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// Getxattr gets extended attributes.
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func (fsys *FS) Getxattr(path string, name string) (errc int, value []byte) {
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fsys.rateLimit()
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return -fuse.ENOSYS, nil
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}
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// Removexattr removes extended attributes.
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func (fsys *FS) Removexattr(path string, name string) (errc int) {
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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// Listxattr lists extended attributes.
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func (fsys *FS) Listxattr(path string, fill func(name string) bool) (errc int) {
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fsys.rateLimit()
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return -fuse.ENOSYS
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}
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@ -138,7 +138,7 @@ func mount(VFS *vfs.VFS, mountPath string, opt *mountlib.Options) (<-chan error,
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// Create underlying FS
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f := VFS.Fs()
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fsys := NewFS(VFS)
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fsys := NewFS(VFS, opt)
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host := fuse.NewFileSystemHost(fsys)
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host.SetCapReaddirPlus(true) // only works on Windows
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host.SetCapCaseInsensitive(f.Features().CaseInsensitive)
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