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
152
153
154
155
156
157
158
|
// 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 nodefs
import (
"log"
"sync"
"unsafe"
"github.com/hanwen/go-fuse/fuse"
)
// openedFile stores either an open dir or an open file.
type openedFile struct {
handled
WithFlags
dir *connectorDir
}
type fileSystemMount struct {
// Node that we were mounted on.
mountInode *Inode
// Parent to the mountInode.
parentInode *Inode
// Options for the mount.
options *Options
// Protects the "children" and "parents" hashmaps of the inodes
// within the mount.
// treeLock should be acquired before openFilesLock.
//
// If multiple treeLocks must be acquired, the treeLocks
// closer to the root must be acquired first.
treeLock sync.RWMutex
// Manage filehandles of open files.
openFiles handleMap
Debug bool
connector *FileSystemConnector
}
// Must called with lock for parent held.
func (m *fileSystemMount) mountName() string {
for k, v := range m.parentInode.children {
if m.mountInode == v {
return k
}
}
panic("not found")
}
func (m *fileSystemMount) setOwner(attr *fuse.Attr) {
if m.options.Owner != nil {
attr.Owner = *(*fuse.Owner)(m.options.Owner)
}
}
func (m *fileSystemMount) fillEntry(out *fuse.EntryOut) {
splitDuration(m.options.EntryTimeout, &out.EntryValid, &out.EntryValidNsec)
splitDuration(m.options.AttrTimeout, &out.AttrValid, &out.AttrValidNsec)
m.setOwner(&out.Attr)
if out.Mode&fuse.S_IFDIR == 0 && out.Nlink == 0 {
out.Nlink = 1
}
}
func (m *fileSystemMount) fillAttr(out *fuse.AttrOut, nodeId uint64) {
splitDuration(m.options.AttrTimeout, &out.AttrValid, &out.AttrValidNsec)
m.setOwner(&out.Attr)
if out.Ino == 0 {
out.Ino = nodeId
}
}
func (m *fileSystemMount) getOpenedFile(h uint64) *openedFile {
var b *openedFile
if h != 0 {
b = (*openedFile)(unsafe.Pointer(m.openFiles.Decode(h)))
}
if b != nil && m.connector.debug && b.WithFlags.Description != "" {
log.Printf("File %d = %q", h, b.WithFlags.Description)
}
return b
}
func (m *fileSystemMount) unregisterFileHandle(handle uint64, node *Inode) *openedFile {
_, obj := m.openFiles.Forget(handle, 1)
opened := (*openedFile)(unsafe.Pointer(obj))
node.openFilesMutex.Lock()
idx := -1
for i, v := range node.openFiles {
if v == opened {
idx = i
break
}
}
l := len(node.openFiles)
if idx == l-1 {
node.openFiles[idx] = nil
} else {
node.openFiles[idx] = node.openFiles[l-1]
}
node.openFiles = node.openFiles[:l-1]
node.openFilesMutex.Unlock()
return opened
}
func (m *fileSystemMount) registerFileHandle(node *Inode, dir *connectorDir, f File, flags uint32) (uint64, *openedFile) {
node.openFilesMutex.Lock()
b := &openedFile{
dir: dir,
WithFlags: WithFlags{
File: f,
OpenFlags: flags,
},
}
for {
withFlags, ok := f.(*WithFlags)
if !ok {
break
}
b.WithFlags.File = withFlags.File
b.WithFlags.FuseFlags |= withFlags.FuseFlags
b.WithFlags.Description += withFlags.Description
f = withFlags.File
}
if b.WithFlags.File != nil {
b.WithFlags.File.SetInode(node)
}
node.openFiles = append(node.openFiles, b)
handle, _ := m.openFiles.Register(&b.handled)
node.openFilesMutex.Unlock()
return handle, b
}
// Creates a return entry for a non-existent path.
func (m *fileSystemMount) negativeEntry(out *fuse.EntryOut) bool {
if m.options.NegativeTimeout > 0.0 {
out.NodeId = 0
splitDuration(m.options.NegativeTimeout, &out.EntryValid, &out.EntryValidNsec)
return true
}
return false
}
|
