func (fh *FileHandle) ReadAt(p []byte, offset int64) (int, error) {
if !fl.IsReadAllowed(fh.flags) {
return 0, EBADF
}
return fh.of.ReadAt(p, offset)
}
func (bh *CachedBlobHandle) PRead(p []byte, offset int64) error {
if !fl.IsReadAllowed(bh.flags) {
return EPERM
}
return bh.be.PRead(p, offset)
}
func (fh *FileHandle) PRead(offset int64, p []byte) error {
if !fl.IsReadAllowed(fh.flags) {
return EBADF
}
return fh.of.PRead(offset, p)
}
func (fs *FileSystem) OpenFile(id inodedb.ID, flags int) (*FileHandle, error) {
logger.Infof(fslog, "OpenFile(id: %v, flags rok: %t wok: %t)", id, fl.IsReadAllowed(flags), fl.IsWriteAllowed(flags))
tryLock := fl.IsWriteAllowed(flags)
if tryLock && !fl.IsWriteAllowed(fs.bs.Flags()) {
return nil, EACCES
}
of := fs.getOrCreateOpenFile(id)
of.mu.Lock()
defer of.mu.Unlock()
ofIsInitialized := of.nlock.ID != 0
if ofIsInitialized && (of.nlock.HasTicket() || !tryLock) {
// No need to upgrade lock. Just use cached filehandle.
logger.Infof(fslog, "Using cached of for inode id: %v", id)
return of.OpenHandleWithoutLock(flags), nil
}
// upgrade lock or acquire new lock...
v, nlock, err := fs.idb.QueryNode(id, tryLock)
if err != nil {
return nil, err
}
if v.GetType() != inodedb.FileNodeT {
if err := fs.idb.UnlockNode(nlock); err != nil {
logger.Warningf(fslog, "Unlock node failed for non-file node: %v", err)
}
if v.GetType() == inodedb.DirNodeT {
return nil, EISDIR
}
return nil, fmt.Errorf("Specified node not file but has type %v", v.GetType())
}
of.nlock = nlock
caio := NewINodeDBChunksArrayIO(fs.idb, nlock)
of.cfio = chunkstore.NewChunkedFileIO(fs.bs, fs.c, caio)
of.cfio.SetOrigFilename(fs.tryGetOrigPath(nlock.ID))
if fl.IsWriteTruncate(flags) {
if err := of.truncateWithLock(0); err != nil {
return nil, fmt.Errorf("Failed to truncate file: %v", err)
}
}
fh := of.OpenHandleWithoutLock(flags)
return fh, nil
}
func (f *FileBlobStore) OpenReader(blobpath string) (io.ReadCloser, error) {
if !fl.IsReadAllowed(f.flags) {
return nil, EPERM
}
realpath := path.Join(f.base, blobpath)
rc, err := os.Open(realpath)
if err != nil {
if os.IsNotExist(err) {
return nil, ENOENT
}
return nil, err
}
return rc, nil
}
func (s *CacheUsageStats) ObserveOpen(blobpath string, flags int) {
s.mu.Lock()
defer s.mu.Unlock()
e := s.entries[blobpath]
if fl.IsReadAllowed(flags) {
e.readCount++
}
if fl.IsWriteAllowed(flags) {
e.writeCount++
}
e.lastUsed = time.Now()
s.entries[blobpath] = e
}
func (cfio *ChunkedFileIO) ReadAt(p []byte, offset int64) (int, error) {
remo := offset
remp := p
if offset < 0 {
return 0, fmt.Errorf("negative offset %d given", offset)
}
cs, err := cfio.caio.Read()
if err != nil {
return 0, fmt.Errorf("Failed to read cs array: %v", err)
}
if !fl.IsReadAllowed(cfio.bs.Flags()) {
return 0, EPERM
}
// fmt.Printf("cs: %v\n", cs)
for i := 0; i < len(cs) && len(remp) > 0; i++ {
c := cs[i]
if c.Left() > remo+int64(len(remp)) {
break
}
if c.Right() <= remo {
continue
}
coff := remo - c.Left()
if coff < 0 {
// Fill gap with zero
n := util.Int64Min(int64(len(remp)), -coff)
for j := int64(0); j < n; j++ {
remp[j] = 0
}
remo += n
coff = 0
if len(remp) == 0 {
return int(remo - offset), nil
}
}
bh, err := cfio.bs.Open(c.BlobPath, fl.O_RDONLY)
if err != nil {
return int(remo - offset), fmt.Errorf("Failed to open path \"%s\" for reading: %v", c.BlobPath, err)
}
defer func() {
if err := bh.Close(); err != nil {
logger.Criticalf(mylog, "blobhandle Close failed: %v", err)
}
}()
cio := cfio.newChunkIO(bh, cfio.c, c.Offset)
defer func() {
if err := cio.Close(); err != nil {
logger.Criticalf(mylog, "cio Close failed: %v", err)
}
}()
n := util.Int64Min(int64(len(p)), c.Length-coff)
if err := cio.PRead(remp[:n], coff); err != nil {
return int(remo - offset), err
}
remo += n
remp = remp[n:]
if len(remp) == 0 {
return int(remo - offset), nil
}
}
// logger.Debugf(mylog, "cs: %+v", cs)
return int(remo - offset), nil
}
func (cfio *ChunkedFileIO) PRead(offset int64, p []byte) error {
remo := offset
remp := p
if offset < 0 {
return fmt.Errorf("negative offset %d given", offset)
}
cs, err := cfio.caio.Read()
if err != nil {
return fmt.Errorf("Failed to read cs array: %v", err)
}
// fmt.Printf("cs: %v\n", cs)
for i := 0; i < len(cs) && len(remp) > 0; i++ {
c := cs[i]
if c.Left() > remo+int64(len(remp)) {
break
}
if c.Right() <= remo {
continue
}
coff := remo - c.Left()
if coff < 0 {
// Fill gap with zero
n := Int64Min(int64(len(remp)), -coff)
for j := int64(0); j < n; j++ {
remp[j] = 0
}
remo += n
coff = 0
if len(remp) == 0 {
return nil
}
}
if !fl.IsReadAllowed(cfio.bs.Flags()) {
return EPERM
}
bh, err := cfio.bs.Open(c.BlobPath, fl.O_RDONLY)
if err != nil {
return fmt.Errorf("Failed to open path \"%s\" for reading: %v", c.BlobPath, err)
}
defer func() {
if err := bh.Close(); err != nil {
log.Printf("blobhandle Close failed: %v", err)
}
}()
cio := cfio.newChunkIO(bh, cfio.c, c.Offset)
defer func() {
if err := cio.Close(); err != nil {
log.Printf("cio Close failed: %v", err)
}
}()
n := Int64Min(int64(len(p)), c.Length-coff)
if err := cio.PRead(coff, remp[:n]); err != nil {
return err
}
remo += n
remp = remp[n:]
if len(remp) == 0 {
return nil
}
}
log.Printf("cs: %+v", cs)
return fmt.Errorf("Attempt to read over file size by %d", len(remp))
}