func (sub *Sub) getFileToCopy(myPathName string,
hashVal hash.Hash) subproto.FileToCopyToCache {
subFS := sub.FileSystem
requiredFS := sub.requiredFS
inos, ok := subFS.HashToInodesTable()[hashVal]
if !ok {
panic("No object in cache for: " + myPathName)
}
file := subproto.FileToCopyToCache{
Name: subFS.InodeToFilenamesTable()[inos[0]][0],
Hash: hashVal,
}
// Try to find an inode where all its links will be deleted and mark one of
// the links (filenames) to be hardlinked instead of copied into the cache.
for _, iNum := range inos {
filenames := subFS.InodeToFilenamesTable()[iNum]
for _, filename := range filenames {
if _, ok := requiredFS.FilenameToInodeTable()[filename]; ok {
filenames = nil
break
}
if sub.filter == nil || sub.filter.Match(filename) {
filenames = nil
break
}
}
if filenames != nil {
file.DoHardlink = true
break
}
}
return file
}
func addInode(request *subproto.UpdateRequest, state *state,
requiredEntry *filesystem.DirectoryEntry, myPathName string) {
requiredInode := requiredEntry.Inode()
if name, ok := state.inodesCreated[requiredEntry.InodeNumber]; ok {
makeHardlink(request, myPathName, name)
return
}
// Try to find a sibling inode.
names := state.requiredFS.InodeToFilenamesTable[requiredEntry.InodeNumber]
if len(names) > 1 {
var sameDataInode filesystem.GenericInode
var sameDataName string
for _, name := range names {
if inum, found := state.getSubInodeFromFilename(name); found {
subInode := state.subFS.InodeTable[inum]
_, sameMetadata, sameData := filesystem.CompareInodes(
subInode, requiredInode, nil)
if sameMetadata && sameData {
makeHardlink(request, myPathName, name)
return
}
if sameData {
sameDataInode = subInode
sameDataName = name
}
}
}
if sameDataInode != nil {
updateMetadata(request, state, requiredEntry, sameDataName)
makeHardlink(request, myPathName, sameDataName)
return
}
}
if inode, ok := requiredEntry.Inode().(*filesystem.RegularInode); ok {
if inode.Size > 0 {
if _, ok := state.subObjectCacheUsage[inode.Hash]; ok {
state.subObjectCacheUsage[inode.Hash]++
} else {
// Not in object cache: grab it from file-system.
if state.subFS.HashToInodesTable == nil {
state.subFS.BuildHashToInodesTable()
}
if ilist, ok := state.subFS.HashToInodesTable[inode.Hash]; ok {
var fileToCopy subproto.FileToCopyToCache
fileToCopy.Name =
state.subFS.InodeToFilenamesTable[ilist[0]][0]
fileToCopy.Hash = inode.Hash
request.FilesToCopyToCache = append(
request.FilesToCopyToCache, fileToCopy)
state.subObjectCacheUsage[inode.Hash] = 1
} else {
panic("No object in cache for: " + myPathName)
}
}
}
}
var inode subproto.Inode
inode.Name = myPathName
inode.GenericInode = requiredEntry.Inode()
request.InodesToMake = append(request.InodesToMake, inode)
state.inodesCreated[requiredEntry.InodeNumber] = myPathName
}