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package mount
import (
"github.com/hanwen/go-fuse/v2/fuse"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/util"
"sync"
"time"
)
type InodeToPath struct {
sync.RWMutex
nextInodeId uint64
cacheMetaTtlSec time.Duration
inode2path map[uint64]*InodeEntry
path2inode map[util.FullPath]uint64
}
type InodeEntry struct {
paths []util.FullPath
nlookup uint64
isDirectory bool
isChildrenCached bool
cachedExpiresTime time.Time
}
func (ie *InodeEntry) removeOnePath(p util.FullPath) bool {
if len(ie.paths) == 0 {
return false
}
idx := -1
for i, x := range ie.paths {
if x == p {
idx = i
break
}
}
if idx < 0 {
return false
}
for x := idx; x < len(ie.paths)-1; x++ {
ie.paths[x] = ie.paths[x+1]
}
ie.paths = ie.paths[0 : len(ie.paths)-1]
ie.nlookup--
return true
}
func NewInodeToPath(root util.FullPath, ttlSec int) *InodeToPath {
t := &InodeToPath{
inode2path: make(map[uint64]*InodeEntry),
path2inode: make(map[util.FullPath]uint64),
cacheMetaTtlSec: time.Second * time.Duration(ttlSec),
}
t.inode2path[1] = &InodeEntry{[]util.FullPath{root}, 1, true, false, time.Time{}}
t.path2inode[root] = 1
return t
}
// EnsurePath make sure the full path is tracked, used by symlink.
func (i *InodeToPath) EnsurePath(path util.FullPath, isDirectory bool) bool {
for {
dir, _ := path.DirAndName()
if dir == "/" {
return true
}
if i.EnsurePath(util.FullPath(dir), true) {
i.Lookup(path, time.Now().Unix(), isDirectory, false, 0, false)
return true
}
}
return false
}
func (i *InodeToPath) Lookup(path util.FullPath, unixTime int64, isDirectory bool, isHardlink bool, possibleInode uint64, isLookup bool) uint64 {
i.Lock()
defer i.Unlock()
inode, found := i.path2inode[path]
if !found {
if possibleInode == 0 {
inode = path.AsInode(unixTime)
} else {
inode = possibleInode
}
if !isHardlink {
for _, found := i.inode2path[inode]; found; inode++ {
_, found = i.inode2path[inode+1]
}
}
}
i.path2inode[path] = inode
if _, found := i.inode2path[inode]; found {
if isLookup {
i.inode2path[inode].nlookup++
}
} else {
if !isLookup {
i.inode2path[inode] = &InodeEntry{[]util.FullPath{path}, 0, isDirectory, false, time.Time{}}
} else {
i.inode2path[inode] = &InodeEntry{[]util.FullPath{path}, 1, isDirectory, false, time.Time{}}
}
}
return inode
}
func (i *InodeToPath) AllocateInode(path util.FullPath, unixTime int64) uint64 {
if path == "/" {
return 1
}
i.Lock()
defer i.Unlock()
inode := path.AsInode(unixTime)
for _, found := i.inode2path[inode]; found; inode++ {
_, found = i.inode2path[inode]
}
return inode
}
func (i *InodeToPath) GetInode(path util.FullPath) (uint64, bool) {
if path == "/" {
return 1, true
}
i.Lock()
defer i.Unlock()
inode, found := i.path2inode[path]
if !found {
// glog.Fatalf("GetInode unknown inode for %s", path)
// this could be the parent for mount point
}
return inode, found
}
func (i *InodeToPath) GetPath(inode uint64) (util.FullPath, fuse.Status) {
i.RLock()
defer i.RUnlock()
path, found := i.inode2path[inode]
if !found || len(path.paths) == 0 {
return "", fuse.ENOENT
}
return path.paths[0], fuse.OK
}
func (i *InodeToPath) HasPath(path util.FullPath) bool {
i.RLock()
defer i.RUnlock()
_, found := i.path2inode[path]
return found
}
func (i *InodeToPath) MarkChildrenCached(fullpath util.FullPath) {
i.Lock()
defer i.Unlock()
inode, found := i.path2inode[fullpath]
if !found {
// https://github.com/seaweedfs/seaweedfs/issues/4968
// glog.Fatalf("MarkChildrenCached not found inode %v", fullpath)
glog.Warningf("MarkChildrenCached not found inode %v", fullpath)
return
}
path, found := i.inode2path[inode]
path.isChildrenCached = true
if i.cacheMetaTtlSec > 0 {
path.cachedExpiresTime = time.Now().Add(i.cacheMetaTtlSec)
}
}
func (i *InodeToPath) IsChildrenCached(fullpath util.FullPath) bool {
i.RLock()
defer i.RUnlock()
inode, found := i.path2inode[fullpath]
if !found {
return false
}
path, found := i.inode2path[inode]
if !found {
return false
}
if path.isChildrenCached {
return path.cachedExpiresTime.IsZero() || time.Now().Before(path.cachedExpiresTime)
}
return false
}
func (i *InodeToPath) HasInode(inode uint64) bool {
if inode == 1 {
return true
}
i.RLock()
defer i.RUnlock()
_, found := i.inode2path[inode]
return found
}
func (i *InodeToPath) AddPath(inode uint64, path util.FullPath) {
i.Lock()
defer i.Unlock()
i.path2inode[path] = inode
ie, found := i.inode2path[inode]
if found {
ie.paths = append(ie.paths, path)
ie.nlookup++
} else {
i.inode2path[inode] = &InodeEntry{
paths: []util.FullPath{path},
nlookup: 1,
isDirectory: false,
isChildrenCached: false,
}
}
}
func (i *InodeToPath) RemovePath(path util.FullPath) {
i.Lock()
defer i.Unlock()
inode, found := i.path2inode[path]
if found {
delete(i.path2inode, path)
i.removePathFromInode2Path(inode, path)
}
}
func (i *InodeToPath) removePathFromInode2Path(inode uint64, path util.FullPath) {
ie, found := i.inode2path[inode]
if !found {
return
}
if !ie.removeOnePath(path) {
return
}
if len(ie.paths) == 0 {
delete(i.inode2path, inode)
}
}
func (i *InodeToPath) MovePath(sourcePath, targetPath util.FullPath) (sourceInode, targetInode uint64) {
i.Lock()
defer i.Unlock()
sourceInode, sourceFound := i.path2inode[sourcePath]
targetInode, targetFound := i.path2inode[targetPath]
if targetFound {
i.removePathFromInode2Path(targetInode, targetPath)
delete(i.path2inode, targetPath)
}
if sourceFound {
delete(i.path2inode, sourcePath)
i.path2inode[targetPath] = sourceInode
} else {
// it is possible some source folder items has not been visited before
// so no need to worry about their source inodes
return
}
if entry, entryFound := i.inode2path[sourceInode]; entryFound {
for i, p := range entry.paths {
if p == sourcePath {
entry.paths[i] = targetPath
}
}
entry.isChildrenCached = false
if !targetFound {
entry.nlookup++
}
} else {
glog.Errorf("MovePath %s to %s: sourceInode %d not found", sourcePath, targetPath, sourceInode)
}
return
}
func (i *InodeToPath) Forget(inode, nlookup uint64, onForgetDir func(dir util.FullPath)) {
i.Lock()
path, found := i.inode2path[inode]
if found {
path.nlookup -= nlookup
if path.nlookup <= 0 {
for _, p := range path.paths {
delete(i.path2inode, p)
}
delete(i.inode2path, inode)
}
}
i.Unlock()
if found {
if path.isDirectory && path.nlookup <= 0 && onForgetDir != nil {
path.isChildrenCached = false
for _, p := range path.paths {
onForgetDir(p)
}
}
}
}
|
