github.com/jincm/wesharechain@v0.0.0-20210122032815-1537409ce26a/chain/swarm/fuse/swarmfs.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package fuse
    18  
    19  import (
    20  	"sync"
    21  	"time"
    22  
    23  	"github.com/ethereum/go-ethereum/swarm/api"
    24  )
    25  
    26  const (
    27  	SwarmFSVersion = "0.1"
    28  	mountTimeout   = time.Second * 5
    29  	unmountTimeout = time.Second * 10
    30  	maxFUSEMounts  = 5
    31  )
    32  
    33  var (
    34  	swarmfs     *SwarmFS // Swarm file system singleton
    35  	swarmfsLock sync.Once
    36  
    37  	inode     uint64 = 1 // global inode
    38  	inodeLock sync.RWMutex
    39  )
    40  
    41  type SwarmFS struct {
    42  	swarmApi     *api.API
    43  	activeMounts map[string]*MountInfo
    44  	swarmFsLock  *sync.RWMutex
    45  }
    46  
    47  func NewSwarmFS(api *api.API) *SwarmFS {
    48  	swarmfsLock.Do(func() {
    49  		swarmfs = &SwarmFS{
    50  			swarmApi:     api,
    51  			swarmFsLock:  &sync.RWMutex{},
    52  			activeMounts: map[string]*MountInfo{},
    53  		}
    54  	})
    55  	return swarmfs
    56  
    57  }
    58  
    59  // Inode numbers need to be unique, they are used for caching inside fuse
    60  func NewInode() uint64 {
    61  	inodeLock.Lock()
    62  	defer inodeLock.Unlock()
    63  	inode += 1
    64  	return inode
    65  }