mirror of
https://github.com/minio/minio.git
synced 2024-12-25 06:35:56 -05:00
289e1d8b2a
currently crawler waits for an entire readdir call to return until it processes usage, lifecycle, replication and healing - instead we should pass the applicator all the way down to avoid building any special stack for all the contents in a single directory. This allows for - no need to remember the entire list of entries per directory before applying the required functions - no need to wait for entire readdir() call to finish before applying the required functions
216 lines
5.6 KiB
Go
216 lines
5.6 KiB
Go
// +build linux,!appengine darwin freebsd netbsd openbsd
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/*
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* MinIO Cloud Storage, (C) 2016-2020 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"fmt"
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"os"
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"sync"
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"syscall"
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"unsafe"
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)
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// The buffer must be at least a block long.
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// refer https://github.com/golang/go/issues/24015
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const blockSize = 8 << 10 // 8192
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// By default atleast 128 entries in single getdents call (1MiB buffer)
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var direntPool = sync.Pool{
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New: func() interface{} {
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buf := make([]byte, blockSize*128)
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return &buf
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},
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}
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// unexpectedFileMode is a sentinel (and bogus) os.FileMode
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// value used to represent a syscall.DT_UNKNOWN Dirent.Type.
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const unexpectedFileMode os.FileMode = os.ModeNamedPipe | os.ModeSocket | os.ModeDevice
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func parseDirEnt(buf []byte) (consumed int, name []byte, typ os.FileMode, err error) {
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// golang.org/issue/15653
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dirent := (*syscall.Dirent)(unsafe.Pointer(&buf[0]))
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if v := unsafe.Offsetof(dirent.Reclen) + unsafe.Sizeof(dirent.Reclen); uintptr(len(buf)) < v {
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return consumed, nil, typ, fmt.Errorf("buf size of %d smaller than dirent header size %d", len(buf), v)
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}
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if len(buf) < int(dirent.Reclen) {
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return consumed, nil, typ, fmt.Errorf("buf size %d < record length %d", len(buf), dirent.Reclen)
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}
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consumed = int(dirent.Reclen)
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if direntInode(dirent) == 0 { // File absent in directory.
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return
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}
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switch dirent.Type {
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case syscall.DT_REG:
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typ = 0
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case syscall.DT_DIR:
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typ = os.ModeDir
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case syscall.DT_LNK:
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typ = os.ModeSymlink
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default:
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// Skip all other file types. Revisit if/when this code needs
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// to handle such files, MinIO is only interested in
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// files and directories.
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typ = unexpectedFileMode
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}
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nameBuf := (*[unsafe.Sizeof(dirent.Name)]byte)(unsafe.Pointer(&dirent.Name[0]))
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nameLen, err := direntNamlen(dirent)
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if err != nil {
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return consumed, nil, typ, err
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}
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return consumed, nameBuf[:nameLen], typ, nil
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}
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// Return all the entries at the directory dirPath.
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func readDir(dirPath string) (entries []string, err error) {
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return readDirN(dirPath, -1)
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}
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// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into
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// the directory itself, if the dirPath doesn't exist this function doesn't return
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// an error.
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func readDirFn(dirPath string, fn func(name string, typ os.FileMode) error) error {
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f, err := os.Open(dirPath)
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if err != nil {
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if osErrToFileErr(err) == errFileNotFound {
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return nil
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}
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return osErrToFileErr(err)
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}
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defer f.Close()
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buf := make([]byte, blockSize)
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boff := 0 // starting read position in buf
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nbuf := 0 // end valid data in buf
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for {
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if boff >= nbuf {
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boff = 0
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nbuf, err = syscall.ReadDirent(int(f.Fd()), buf)
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if err != nil {
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if isSysErrNotDir(err) {
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return nil
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}
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return err
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}
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if nbuf <= 0 {
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break // EOF
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}
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}
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consumed, name, typ, err := parseDirEnt(buf[boff:nbuf])
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if err != nil {
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return err
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}
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boff += consumed
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if len(name) == 0 || bytes.Equal(name, []byte{'.'}) || bytes.Equal(name, []byte{'.', '.'}) {
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continue
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}
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if typ&os.ModeSymlink == os.ModeSymlink {
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continue
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}
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if err = fn(string(name), typ); err == errDoneForNow {
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// fn() requested to return by caller.
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return nil
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}
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}
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return err
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}
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// Return count entries at the directory dirPath and all entries
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// if count is set to -1
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func readDirN(dirPath string, count int) (entries []string, err error) {
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f, err := os.Open(dirPath)
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if err != nil {
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return nil, osErrToFileErr(err)
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}
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defer f.Close()
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bufp := direntPool.Get().(*[]byte)
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defer direntPool.Put(bufp)
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nameTmp := direntPool.Get().(*[]byte)
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defer direntPool.Put(nameTmp)
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tmp := *nameTmp
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boff := 0 // starting read position in buf
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nbuf := 0 // end valid data in buf
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for count != 0 {
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if boff >= nbuf {
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boff = 0
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nbuf, err = syscall.ReadDirent(int(f.Fd()), *bufp)
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if err != nil {
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if isSysErrNotDir(err) {
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return nil, errFileNotFound
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}
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return nil, err
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}
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if nbuf <= 0 {
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break
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}
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}
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consumed, name, typ, err := parseDirEnt((*bufp)[boff:nbuf])
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if err != nil {
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return nil, err
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}
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boff += consumed
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if len(name) == 0 || bytes.Equal(name, []byte{'.'}) || bytes.Equal(name, []byte{'.', '.'}) {
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continue
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}
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// Fallback for filesystems (like old XFS) that don't
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// support Dirent.Type and have DT_UNKNOWN (0) there
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// instead.
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if typ == unexpectedFileMode {
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fi, err := os.Lstat(pathJoin(dirPath, string(name)))
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if err != nil {
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// It got deleted in the meantime, not found
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// or returns too many symlinks ignore this
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// file/directory.
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if osIsNotExist(err) || isSysErrPathNotFound(err) ||
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isSysErrTooManySymlinks(err) {
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continue
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}
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return nil, err
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}
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typ = fi.Mode() & os.ModeType
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}
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if typ&os.ModeSymlink == os.ModeSymlink {
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continue
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}
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if typ.IsRegular() {
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entries = append(entries, string(name))
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} else if typ.IsDir() {
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// Use temp buffer to append a slash to avoid string concat.
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tmp = tmp[:len(name)+1]
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copy(tmp, name)
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tmp[len(tmp)-1] = '/' // SlashSeparator
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entries = append(entries, string(tmp))
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}
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count--
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}
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return
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}
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func globalSync() {
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syscall.Sync()
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}
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