int
fileTruncate(File *f, char *uid)
{
if(fileIsDir(f)){
vtSetError(ENotFile);
return 0;
}
if(!fileLock(f))
return 0;
if(f->source->mode != OReadWrite){
vtSetError(EReadOnly);
fileUnlock(f);
return 0;
}
if(!sourceLock(f->source, -1)){
fileUnlock(f);
return 0;
}
if(!sourceTruncate(f->source)){
sourceUnlock(f->source);
fileUnlock(f);
return 0;
}
sourceUnlock(f->source);
fileUnlock(f);
fileWAccess(f, uid);
return 1;
}
int
fileMetaFlush(File *f, int rec)
{
File **kids, *p;
int nkids;
int i, rv;
fileMetaLock(f);
rv = fileMetaFlush2(f, nil);
fileMetaUnlock(f);
if(!rec || !fileIsDir(f))
return rv;
if(!fileLock(f))
return rv;
nkids = 0;
for(p=f->down; p; p=p->next)
nkids++;
kids = vtMemAlloc(nkids*sizeof(File*));
i = 0;
for(p=f->down; p; p=p->next){
kids[i++] = p;
p->ref++;
}
fileUnlock(f);
for(i=0; i<nkids; i++){
rv |= fileMetaFlush(kids[i], 1);
fileDecRef(kids[i]);
}
vtMemFree(kids);
return rv;
}
uint64_t Directory::fileSize(void) const
{
if(!mDirent) throw Exception("No more files in directory");
if(fileIsDir()) return 0;
stat_t st;
if(pla::stat(filePath().pathEncode().c_str(), &st)) return 0;
return uint64_t(st.st_size);
}
void Directory::getFileInfo(StringMap &map) const
{
// Note: fileInfo must not contain path
map.clear();
map["name"] = fileName();
map["time"] << fileTime();
if(fileIsDir()) map["type"] = "directory";
else {
map["type"] = "file";
map["size"] << fileSize();
}
}
int
fileRemove(File *f, char *uid)
{
File *ff;
/* can not remove the root */
if(fileIsRoot(f)){
vtSetError(ERoot);
return 0;
}
if(!fileLock(f))
return 0;
if(f->source->mode != OReadWrite){
vtSetError(EReadOnly);
goto Err1;
}
if(!sourceLock2(f->source, f->msource, -1))
goto Err1;
if(fileIsDir(f) && !fileCheckEmpty(f))
goto Err;
for(ff=f->down; ff; ff=ff->next)
assert(ff->removed);
sourceRemove(f->source);
f->source->file = nil; /* erase back pointer */
f->source = nil;
if(f->msource){
sourceRemove(f->msource);
f->msource = nil;
}
fileUnlock(f);
if(!fileMetaRemove(f, uid))
return 0;
return 1;
Err:
sourceUnlock(f->source);
if(f->msource)
sourceUnlock(f->msource);
Err1:
fileUnlock(f);
return 0;
}
int
fileGetDir(File *f, DirEntry *dir)
{
if(!fileRLock(f))
return 0;
fileMetaLock(f);
deCopy(dir, &f->dir);
fileMetaUnlock(f);
if(!fileIsDir(f)){
if(!sourceLock(f->source, OReadOnly)){
fileRUnlock(f);
return 0;
}
dir->size = sourceGetSize(f->source);
sourceUnlock(f->source);
}
fileRUnlock(f);
return 1;
}
DirEntryEnum *
deeOpen(File *f)
{
DirEntryEnum *dee;
File *p;
if(!fileIsDir(f)){
vtSetError(ENotDir);
fileDecRef(f);
return nil;
}
/* flush out meta data */
if(!fileLock(f))
return nil;
for(p=f->down; p; p=p->next)
fileMetaFlush2(p, nil);
fileUnlock(f);
dee = vtMemAllocZ(sizeof(DirEntryEnum));
dee->file = fileIncRef(f);
return dee;
}
int
fileSetDir(File *f, DirEntry *dir, char *uid)
{
File *ff;
char *oelem;
u32int mask;
u64int size;
/* can not set permissions for the root */
if(fileIsRoot(f)){
vtSetError(ERoot);
return 0;
}
if(!fileLock(f))
return 0;
if(f->source->mode != OReadWrite){
vtSetError(EReadOnly);
fileUnlock(f);
return 0;
}
fileMetaLock(f);
/* check new name does not already exist */
if(strcmp(f->dir.elem, dir->elem) != 0){
for(ff = f->up->down; ff; ff=ff->next){
if(strcmp(dir->elem, ff->dir.elem) == 0 && !ff->removed){
vtSetError(EExists);
goto Err;
}
}
ff = dirLookup(f->up, dir->elem);
if(ff != nil){
fileDecRef(ff);
vtSetError(EExists);
goto Err;
}
}
if(!sourceLock2(f->source, f->msource, -1))
goto Err;
if(!fileIsDir(f)){
size = sourceGetSize(f->source);
if(size != dir->size){
if(!sourceSetSize(f->source, dir->size)){
sourceUnlock(f->source);
if(f->msource)
sourceUnlock(f->msource);
goto Err;
}
/* commited to changing it now */
}
}
/* commited to changing it now */
if((f->dir.mode&ModeTemporary) != (dir->mode&ModeTemporary))
fileSetTmp(f, dir->mode&ModeTemporary);
sourceUnlock(f->source);
if(f->msource)
sourceUnlock(f->msource);
oelem = nil;
if(strcmp(f->dir.elem, dir->elem) != 0){
oelem = f->dir.elem;
f->dir.elem = vtStrDup(dir->elem);
}
if(strcmp(f->dir.uid, dir->uid) != 0){
vtMemFree(f->dir.uid);
f->dir.uid = vtStrDup(dir->uid);
}
if(strcmp(f->dir.gid, dir->gid) != 0){
vtMemFree(f->dir.gid);
f->dir.gid = vtStrDup(dir->gid);
}
f->dir.mtime = dir->mtime;
f->dir.atime = dir->atime;
//fprint(2, "mode %x %x ", f->dir.mode, dir->mode);
mask = ~(ModeDir|ModeSnapshot);
f->dir.mode &= ~mask;
f->dir.mode |= mask & dir->mode;
f->dirty = 1;
//fprint(2, "->%x\n", f->dir.mode);
fileMetaFlush2(f, oelem);
vtMemFree(oelem);
fileMetaUnlock(f);
fileUnlock(f);
fileWAccess(f->up, uid);
return 1;
Err:
fileMetaUnlock(f);
fileUnlock(f);
return 0;
}
File *
_fileWalk(File *f, char *elem, int partial)
{
File *ff;
fileRAccess(f);
if(elem[0] == 0){
vtSetError(EBadPath);
return nil;
}
if(!fileIsDir(f)){
vtSetError(ENotDir);
return nil;
}
if(strcmp(elem, ".") == 0){
return fileIncRef(f);
}
if(strcmp(elem, "..") == 0){
if(fileIsRoot(f))
return fileIncRef(f);
return fileIncRef(f->up);
}
if(!fileLock(f))
return nil;
for(ff = f->down; ff; ff=ff->next){
if(strcmp(elem, ff->dir.elem) == 0 && !ff->removed){
ff->ref++;
goto Exit;
}
}
ff = dirLookup(f, elem);
if(ff == nil)
goto Err;
if(ff->dir.mode & ModeSnapshot){
ff->mode = OReadOnly;
ff->issnapshot = 1;
}
if(partial){
/*
* Do nothing. We're opening this file only so we can clri it.
* Usually the sources can't be opened, hence we won't even bother.
* Be VERY careful with the returned file. If you hand it to a routine
* expecting ff->source and/or ff->msource to be non-nil, we're
* likely to dereference nil. FileClri should be the only routine
* setting partial.
*/
ff->partial = 1;
}else if(ff->dir.mode & ModeDir){
ff->source = fileOpenSource(f, ff->dir.entry, ff->dir.gen,
1, ff->mode, ff->issnapshot);
ff->msource = fileOpenSource(f, ff->dir.mentry, ff->dir.mgen,
0, ff->mode, ff->issnapshot);
if(ff->source == nil || ff->msource == nil)
goto Err;
}else{
ff->source = fileOpenSource(f, ff->dir.entry, ff->dir.gen,
0, ff->mode, ff->issnapshot);
if(ff->source == nil)
goto Err;
}
/* link in and up parent ref count */
if (ff->source)
ff->source->file = ff; /* point back */
ff->next = f->down;
f->down = ff;
ff->up = f;
fileIncRef(f);
Exit:
fileUnlock(f);
return ff;
Err:
fileUnlock(f);
if(ff != nil)
fileDecRef(ff);
return nil;
}
