func fillEntryOut(out *raw.EntryOut, i *maggiefs.Inode) {
// fill out
out.NodeId = i.Inodeid
out.Generation = i.Generation
out.EntryValid = uint64(0)
out.AttrValid = uint64(0)
out.EntryValidNsec = uint32(100)
out.AttrValidNsec = uint32(100)
//Inode
out.Ino = i.Inodeid
out.Size = i.Length
out.Blocks = numBlocks(i.Length, maggiefs.PAGESIZE)
out.Atime = uint64(0) // always 0 for atime
out.Mtime = uint64(i.Mtime) // Mtime is user modifiable and is the last time data changed
out.Ctime = uint64(i.Ctime) // Ctime is tracked by the FS and changes when attrs or data change
out.Atimensec = uint32(0)
out.Mtimensec = uint32(0)
out.Ctimensec = uint32(0)
out.Mode = i.FullMode()
out.Nlink = i.Nlink
out.Uid = i.Uid
out.Gid = i.Gid
out.Rdev = uint32(0) // regular file, not block dvice
out.Blksize = maggiefs.PAGESIZE
}
// seta an inode
func (nd *NameData) SetInode(i *maggiefs.Inode) (err error) {
nd.inodeStripeLock[i.Inodeid%STRIPE_SIZE].Lock()
defer nd.inodeStripeLock[i.Inodeid%STRIPE_SIZE].Unlock()
key := make([]byte, 8)
binary.LittleEndian.PutUint64(key, i.Inodeid)
// do the write and send OK
binsize := i.BinSize()
b := make([]byte, binsize)
i.ToBytes(b)
err = nd.inodb.Put(WriteOpts, key, b)
return err
}
// adds an inode persistent store, setting its inode ID to the generated ID, and returning
// the generated id and error
func (nd *NameData) AddInode(i *maggiefs.Inode) (uint64, error) {
newNodeId, err := nd.GetIncrCounter(COUNTER_INODE, 1)
if err != nil {
return 0, err
}
i.Inodeid = newNodeId
err = nd.SetInode(i)
return i.Inodeid, err
}
func (m *MaggieFuse) Mkdir(out *raw.EntryOut, header *raw.InHeader, input *raw.MkdirIn, name string) (code fuse.Status) {
// make new child
currTime := time.Now().Unix()
i := maggiefs.Inode{
0, // id 0 to start, we get id when inserting
0,
maggiefs.FTYPE_DIR,
0,
07777 & input.Mode,
currTime,
currTime,
0,
header.Uid,
header.Gid,
"",
make([]maggiefs.Block, 0, 0),
make(map[string]maggiefs.Dentry),
make(map[string][]byte),
}
// save
id, err := m.names.AddInode(&i)
if err != nil {
return fuse.EROFS
}
i.Inodeid = id
// link parent
err = m.names.Link(header.NodeId, id, name, false)
if err != nil {
// garbage collector will clean up our 0 reference node
if err == maggiefs.E_EXISTS {
return fuse.Status(syscall.EEXIST)
}
if err == maggiefs.E_NOTDIR {
return fuse.ENOTDIR
}
return fuse.EROFS
}
// send entry back to child
fillEntryOut(out, &i)
return fuse.OK
}
func (m *MaggieFuse) Mknod(out *raw.EntryOut, header *raw.InHeader, input *raw.MknodIn, name string) (code fuse.Status) {
//build node
currTime := time.Now().Unix()
i := maggiefs.Inode{
0, // id 0 to start
0, // gen 0
maggiefs.FTYPE_REG,
0,
input.Mode & 07777,
currTime,
currTime,
1,
header.Uid,
header.Gid,
"",
make([]maggiefs.Block, 0, 0),
make(map[string]maggiefs.Dentry),
make(map[string][]byte),
}
// save new node
id, err := m.names.AddInode(&i)
if err != nil {
return fuse.EROFS
}
i.Inodeid = id
// link parent
err = m.names.Link(header.NodeId, i.Inodeid, name, false)
if err != nil {
if err == maggiefs.E_EXISTS {
return fuse.Status(syscall.EEXIST)
} else {
return fuse.EROFS
}
}
// output
fillEntryOut(out, &i)
return fuse.OK
}
// acquires lease, then adds the blocks to the namenode,
// patching up the referenced inode to match
func (w *InodeWriter) addBlocksForFileWrite(inode *maggiefs.Inode, off uint64, length uint32) error {
// fmt.Printf("Adding/extending blocks for write at off %d length %d\n", off, length)
newEndPos := off + uint64(length)
if newEndPos > inode.Length {
// if we have a last block and it's less than max length,
// extend last block to max block length first
// fmt.Printf("Adding/extending blocks for file write to inode %+v\n", inode)
if inode.Blocks != nil && len(inode.Blocks) > 0 {
idx := int(len(inode.Blocks) - 1)
lastBlock := inode.Blocks[idx]
if lastBlock.Length() < BLOCKLENGTH {
extendLength := BLOCKLENGTH - lastBlock.Length()
if lastBlock.EndPos+extendLength > off+uint64(length) {
// only extend as much as we need to
extendLength = off + uint64(length) - lastBlock.EndPos
}
lastBlock.EndPos = lastBlock.EndPos + extendLength
inode.Blocks[idx] = lastBlock
inode.Length += extendLength
}
}
// and add new blocks as necessary
for newEndPos > inode.Length {
// fmt.Printf("New end pos %d still greater than inode length %d\n", newEndPos, inode.Length)
newBlockLength := newEndPos - inode.Length
if newBlockLength > BLOCKLENGTH {
newBlockLength = BLOCKLENGTH
}
newBlock, err := w.names.AddBlock(inode.Inodeid, uint32(newBlockLength))
if err != nil {
return err
}
inode.Blocks = append(inode.Blocks, newBlock)
inode.Length += newBlockLength
}
}
inode.Mtime = time.Now().Unix()
err := w.names.SetInode(inode)
return err
}
func (m *MaggieFuse) Symlink(out *raw.EntryOut, header *raw.InHeader, pointedTo string, linkName string) (code fuse.Status) {
// new inode type symlink
currTime := time.Now().Unix()
i := maggiefs.Inode{
0, // id 0 to start, we get id when inserting
0,
maggiefs.FTYPE_LNK,
0,
0777,
currTime,
currTime,
0,
header.Uid,
header.Gid,
pointedTo,
make([]maggiefs.Block, 0, 0),
make(map[string]maggiefs.Dentry),
make(map[string][]byte),
}
// save
id, err := m.names.AddInode(&i)
if err != nil {
return fuse.EROFS
}
i.Inodeid = id
// link parent
err = m.names.Link(header.NodeId, i.Inodeid, linkName, false)
if err != nil {
if err == maggiefs.E_EXISTS {
return fuse.Status(syscall.EEXIST)
} else if err == maggiefs.E_NOTDIR {
return fuse.ENOTDIR
}
return fuse.EROFS
}
// send entry back to child
fillEntryOut(out, &i)
return fuse.OK
}
func fillAttrOut(out *raw.AttrOut, i *maggiefs.Inode) {
// raw.Attr
out.Ino = i.Inodeid
out.Size = i.Length
out.Blocks = numBlocks(i.Length, maggiefs.PAGESIZE)
out.Atime = uint64(0) // always 0 for atime
out.Mtime = uint64(i.Mtime) // Mtime is user modifiable and is the last time data changed
out.Ctime = uint64(i.Ctime) // Ctime is tracked by the FS and changes when attrs or data change
out.Atimensec = uint32(0)
out.Mtimensec = uint32(0)
out.Ctimensec = uint32(0)
out.Mode = i.FullMode()
out.Nlink = i.Nlink
out.Uid = i.Uid
out.Gid = i.Gid
out.Rdev = uint32(0) // regular file, not block dvice
out.Blksize = maggiefs.PAGESIZE
// raw.AttrOut
out.AttrValid = uint64(0)
out.AttrValidNsec = uint32(100)
fmt.Printf("Filled attrOut %v with inode %v\n", out, i)
}