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|
package mount
import (
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"sync"
)
type FileHandleId uint64
type FileHandleToInode struct {
sync.RWMutex
nextFh FileHandleId
inode2fh map[uint64]*FileHandle
fh2inode map[FileHandleId]uint64
}
type FileHandle struct {
fh FileHandleId
counter int64
entry *filer_pb.Entry
inode uint64
}
func NewFileHandleToInode() *FileHandleToInode {
return &FileHandleToInode{
inode2fh: make(map[uint64]*FileHandle),
fh2inode: make(map[FileHandleId]uint64),
nextFh: 0,
}
}
func (i *FileHandleToInode) GetFileHandle(inode uint64) *FileHandle {
i.Lock()
defer i.Unlock()
fh, found := i.inode2fh[inode]
if !found {
fh = &FileHandle{
fh: i.nextFh,
counter: 1,
inode: inode,
}
i.nextFh++
i.inode2fh[inode] = fh
i.fh2inode[fh.fh] = inode
} else {
fh.counter++
}
return fh
}
func (i *FileHandleToInode) ReleaseByInode(inode uint64) {
i.Lock()
defer i.Unlock()
fh, found := i.inode2fh[inode]
if found {
fh.counter--
if fh.counter <= 0 {
delete(i.inode2fh, inode)
delete(i.fh2inode, fh.fh)
}
}
}
func (i *FileHandleToInode) ReleaseByHandle(fh FileHandleId) {
i.Lock()
defer i.Unlock()
inode, found := i.fh2inode[fh]
if found {
fhHandle, fhFound := i.inode2fh[inode]
if !fhFound {
delete(i.fh2inode, fh)
} else {
fhHandle.counter--
if fhHandle.counter <= 0 {
delete(i.inode2fh, inode)
delete(i.fh2inode, fhHandle.fh)
}
}
}
}
|
