/usr/share/gocode/src/github.com/hanwen/go-fuse/unionfs/cachingfs.go is in golang-github-hanwen-go-fuse-dev 0.0~git20171124.0.14c3015-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | // Copyright 2016 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package unionfs
import (
"fmt"
"log"
"strings"
"time"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
)
const _XATTRSEP = "@XATTR@"
type attrResponse struct {
*fuse.Attr
fuse.Status
}
type xattrResponse struct {
data []byte
fuse.Status
}
type dirResponse struct {
entries []fuse.DirEntry
fuse.Status
}
type linkResponse struct {
linkContent string
fuse.Status
}
// Caches filesystem metadata.
type cachingFileSystem struct {
pathfs.FileSystem
attributes *TimedCache
dirs *TimedCache
links *TimedCache
xattr *TimedCache
}
func readDir(fs pathfs.FileSystem, name string) *dirResponse {
origStream, code := fs.OpenDir(name, nil)
r := &dirResponse{nil, code}
if !code.Ok() {
return r
}
r.entries = origStream
return r
}
func getAttr(fs pathfs.FileSystem, name string) *attrResponse {
a, code := fs.GetAttr(name, nil)
return &attrResponse{
Attr: a,
Status: code,
}
}
func getXAttr(fs pathfs.FileSystem, nameAttr string) *xattrResponse {
ns := strings.SplitN(nameAttr, _XATTRSEP, 2)
a, code := fs.GetXAttr(ns[0], ns[1], nil)
return &xattrResponse{
data: a,
Status: code,
}
}
func readLink(fs pathfs.FileSystem, name string) *linkResponse {
a, code := fs.Readlink(name, nil)
return &linkResponse{
linkContent: a,
Status: code,
}
}
func NewCachingFileSystem(fs pathfs.FileSystem, ttl time.Duration) pathfs.FileSystem {
c := new(cachingFileSystem)
c.FileSystem = fs
c.attributes = NewTimedCache(func(n string) (interface{}, bool) {
a := getAttr(fs, n)
return a, a.Ok()
}, ttl)
c.dirs = NewTimedCache(func(n string) (interface{}, bool) {
d := readDir(fs, n)
return d, d.Ok()
}, ttl)
c.links = NewTimedCache(func(n string) (interface{}, bool) {
l := readLink(fs, n)
return l, l.Ok()
}, ttl)
c.xattr = NewTimedCache(func(n string) (interface{}, bool) {
l := getXAttr(fs, n)
return l, l.Ok()
}, ttl)
return c
}
func (fs *cachingFileSystem) DropCache() {
for _, c := range []*TimedCache{fs.attributes, fs.dirs, fs.links, fs.xattr} {
c.DropAll(nil)
}
}
func (fs *cachingFileSystem) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
if name == _DROP_CACHE {
return &fuse.Attr{
Mode: fuse.S_IFREG | 0777,
}, fuse.OK
}
r := fs.attributes.Get(name).(*attrResponse)
return r.Attr, r.Status
}
func (fs *cachingFileSystem) GetXAttr(name string, attr string, context *fuse.Context) ([]byte, fuse.Status) {
key := name + _XATTRSEP + attr
r := fs.xattr.Get(key).(*xattrResponse)
return r.data, r.Status
}
func (fs *cachingFileSystem) Readlink(name string, context *fuse.Context) (string, fuse.Status) {
r := fs.links.Get(name).(*linkResponse)
return r.linkContent, r.Status
}
func (fs *cachingFileSystem) OpenDir(name string, context *fuse.Context) (stream []fuse.DirEntry, status fuse.Status) {
r := fs.dirs.Get(name).(*dirResponse)
return r.entries, r.Status
}
func (fs *cachingFileSystem) String() string {
return fmt.Sprintf("cachingFileSystem(%v)", fs.FileSystem)
}
func (fs *cachingFileSystem) Open(name string, flags uint32, context *fuse.Context) (f nodefs.File, status fuse.Status) {
if flags&fuse.O_ANYWRITE != 0 && name == _DROP_CACHE {
log.Println("Dropping cache for", fs)
fs.DropCache()
}
return fs.FileSystem.Open(name, flags, context)
}
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