XrdOssFile Class Reference

#include <XrdOssApi.hh>

Inheritance diagram for XrdOssFile:

Collaboration diagram for XrdOssFile:

Public Member Functions
	XrdOssFile (const char *tid, int fdnum=-1)
virtual	~XrdOssFile ()
int	Clone (const std::vector< XrdOucCloneSeg > &cVec)
int	Clone (XrdOssDF &srcFile)
virtual int	Close (long long *retsz=0)
int	Fchmod (mode_t mode)
int	Fctl (int cmd, int alen, const char *args, char **resp=0)
void	Flush ()
	Flush filesystem cached pages for this file (used for checksums).
int	Fstat (struct stat *)
int	Fsync ()
int	Fsync (XrdSfsAio *aiop)
int	Ftruncate (unsigned long long)
int	getFD ()
off_t	getMmap (void **addr)
int	isCompressed (char *cxidp=0)
virtual int	Open (const char *, int, mode_t, XrdOucEnv &)
ssize_t	Read (off_t, size_t)
ssize_t	Read (void *, off_t, size_t)
int	Read (XrdSfsAio *aiop)
ssize_t	ReadRaw (void *, off_t, size_t)
ssize_t	ReadV (XrdOucIOVec *readV, int)
ssize_t	Write (const void *, off_t, size_t)
int	Write (XrdSfsAio *aiop)
Public Member Functions inherited from XrdOssDF
	XrdOssDF (const char *tid="", uint16_t dftype=0, int fdnum=-1)
virtual	~XrdOssDF ()
uint16_t	DFType ()
virtual bool	getErrMsg (std::string &eText)
virtual const char *	getTID ()
virtual int	Opendir (const char *path, XrdOucEnv &env)
virtual ssize_t	pgRead (void *buffer, off_t offset, size_t rdlen, uint32_t *csvec, uint64_t opts)
virtual int	pgRead (XrdSfsAio *aioparm, uint64_t opts)
virtual ssize_t	pgWrite (void *buffer, off_t offset, size_t wrlen, uint32_t *csvec, uint64_t opts)
virtual int	pgWrite (XrdSfsAio *aioparm, uint64_t opts)
virtual ssize_t	Read (XrdOucRangeList &rlist)
virtual int	Readdir (char *buff, int blen)
virtual int	StatRet (struct stat *buff)
virtual ssize_t	WriteV (XrdOucIOVec *writeV, int wrvcnt)

Additional Inherited Members
Static Public Attributes inherited from XrdOssDF
static const uint16_t	DF_isDir = 0x0001
	Object is for a directory.
static const uint16_t	DF_isFile = 0x0002
	Object is for a file.
static const uint16_t	DF_isProxy = 0x0010
	Object is a proxy object.
static const uint64_t	doCalc = 0x4000000000000000ULL
	pgw: Calculate checksums
static const int	Fctl_ckpObj = 0
static const int	Fctl_QFinfo = 3
static const int	Fctl_setFD = 2
static const int	Fctl_utimes = 1
static const uint64_t	Verify = 0x8000000000000000ULL
	all: Verify checksums
Protected Attributes inherited from XrdOssDF
uint16_t	dfType
int	fd
off_t	pgwEOF
short	rsvd
const char *	tident

Detailed Description

Definition at line 89 of file XrdOssApi.hh.

Constructor & Destructor Documentation

XrdOssFile()

XrdOssFile::XrdOssFile ( const char * tid, int fdnum = -1 )

inline

Definition at line 122 of file XrdOssApi.hh.

                  : XrdOssDF(tid, DF_isFile, fdnum),
                    cxobj(0), cacheP(0), mmFile(0),
                    rawio(0), cxpgsz(0),
                    canClone(false)  {cxid[0] = '\0';}

References XrdOssDF::XrdOssDF(), and XrdOssDF::DF_isFile.

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~XrdOssFile()

virtual XrdOssFile::~XrdOssFile ( )

inlinevirtual

Definition at line 128 of file XrdOssApi.hh.

{if (fd >= 0) Close();}

References Close(), and XrdOssDF::fd.

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Member Function Documentation

Clone() [1/2]

int XrdOssFile::Clone ( const std::vector< XrdOucCloneSeg > & cVec )

virtual

Clone contents of a file from one or more oher files.

Parameters

cVec	- A vector of struct XrdOucCloneSeg describing the action.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 293 of file XrdOssApi.cc.

{
#if defined(FICLONERANGE)
  if (!canClone)
    return -EPERM;
 
  if (fd<0)
     return -EBADF;
 
  for(auto &seg: cVec)
    {struct file_clone_range fr;
     fr.src_fd      = seg.srcFD;
     fr.src_offset  = seg.srcOffs;
     fr.src_length  = seg.srcLen;
     fr.dest_offset = seg.dstOffs;
     if (ioctl(fd, FICLONERANGE, &fr) == -1) return -errno;
    }
 
  return XrdOssOK;
#else
  return -ENOTSUP;
#endif
}

References XrdOssDF::fd, and XrdOssOK.

Clone() [2/2]

int XrdOssFile::Clone ( XrdOssDF & srcFile )

virtual

Clone contents of a file from another file.

Parameters

srcFile

- Reference to the file to used to clone contents of this file.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 273 of file XrdOssApi.cc.

{
#if defined(FICLONE)
  if (!canClone)
    return -EPERM;
 
  if (fd<0)
     return -EBADF;
  if (srcFile.getFD() < 0)
     return -EBADF;
 
  if (ioctl(fd, FICLONE, srcFile.getFD())==-1)
    return -errno;
 
  return XrdOssOK;
#else
  return -ENOTSUP;
#endif
}

References XrdOssDF::XrdOssDF(), XrdOssDF::fd, XrdOssDF::getFD(), and XrdOssOK.

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Close()

int XrdOssFile::Close ( long long * retsz = 0 )

virtual

Close a directory or file.

Parameters

retsz

If not nil, where the size of the file is to be returned.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Implements XrdOssDF.

Definition at line 912 of file XrdOssApi.cc.

{
    if (fd < 0) return -XRDOSS_E8004;
    if (retsz || cacheP)
       {struct stat buf;
        int retc;
        do {retc = fstat(fd, &buf);} while(retc && errno == EINTR);
        if (cacheP && FSize != buf.st_size)
           XrdOssCache::Adjust(cacheP, buf.st_size - FSize);
        if (retsz) *retsz = buf.st_size;
       }
    if (close(fd)) return -errno;
    if (mmFile) {XrdOssMio::Recycle(mmFile); mmFile = 0;}
#ifdef XRDOSSCX
    if (cxobj) {delete cxobj; cxobj = 0;}
#endif
    fd = -1; FSize = -1; cacheP = 0;
    return XrdOssOK;
}

References XrdOssCache::Adjust(), close, XrdOssDF::fd, fstat, XrdOssMio::Recycle(), stat, XRDOSS_E8004, and XrdOssOK.

Referenced by ~XrdOssFile().

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Fchmod()

int XrdOssFile::Fchmod ( mode_t mode )

virtual

Change file mode settings.

Parameters

mode	- The new file mode setting.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1149 of file XrdOssApi.cc.

{
    return (fchmod(fd, Mode) ? -errno : XrdOssOK);
}

References XrdOssDF::fd, Mode, and XrdOssOK.

Fctl()

int XrdOssFile::Fctl ( int cmd, int alen, const char * args, char ** resp = 0 )

virtual

Reimplemented from XrdOssDF.

Definition at line 1168 of file XrdOssApi.cc.

{
   const struct timeval *utArgs;
 
   switch(cmd)
         {case XrdOssDF::Fctl_utimes:
               if (alen != sizeof(struct timeval)*2 || !args) return -EINVAL;
               utArgs = (const struct timeval *)args;
               if (futimes(fd, utArgs)) return -errno;
               return XrdOssOK;
               break;
          case XrdOssDF::Fctl_setFD:
               if (dfType != DF_isFile) return -ENOTBLK;
               if (fd >= 0) return -EALREADY;
               if (alen != (int)sizeof(int)) return -EINVAL;
               int retc, newFD;
               memcpy(&newFD, args, sizeof(int));
               struct stat buf;
               do {retc = fstat(newFD, &buf);} while(retc && errno == EINTR);
               if (retc) return -errno;
               fd = newFD;
               FSize = buf.st_size;
               return XrdOssOK;
               break;
          default: break;
         }
   return -ENOTSUP;
}

References XrdOssDF::DF_isFile, XrdOssDF::dfType, XrdOssDF::Fctl_setFD, XrdOssDF::Fctl_utimes, XrdOssDF::fd, fstat, stat, and XrdOssOK.

Flush()

void XrdOssFile::Flush ( )

virtual

Flush filesystem cached pages for this file (used for checksums).

Reimplemented from XrdOssDF.

Definition at line 1207 of file XrdOssApi.cc.

{
// This actually only works in Linux so we punt otherwise
//
#if defined(__linux__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__))
   if (fd>= 0)
      {fdatasync(fd);
       posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
      }
#endif
}

References XrdOssDF::fd, and fdatasync().

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Fstat()

int XrdOssFile::Fstat ( struct stat * buf )

virtual

Return state information for this file.

Parameters

buf	- Pointer to the structure where info it to be returned.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1231 of file XrdOssApi.cc.

{
    return (fstat(fd, buff) ? -errno : XrdOssOK);
}

References XrdOssDF::fd, fstat, stat, and XrdOssOK.

Fsync() [1/2]

int XrdOssFile::Fsync ( void )

virtual

Synchronize associated file with media (synchronous).

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1247 of file XrdOssApi.cc.

{
    return (fsync(fd) ? -errno : XrdOssOK);
}

References XrdOssDF::fd, fsync, and XrdOssOK.

Referenced by Fsync().

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Fsync() [2/2]

int XrdOssFile::Fsync ( XrdSfsAio * aiop )

virtual

Synchronize associated file with media (asynchronous).

Parameters

aiop	- Pointer to async I/O request object.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 102 of file XrdOssAio.cc.

{
 
#ifdef _POSIX_ASYNCHRONOUS_IO
   int rc;
 
// Complete the aio request block and do the operation
//
   if (XrdOssSys::AioAllOk)
      {aiop->sfsAio.aio_fildes = fd;
       aiop->sfsAio.aio_sigevent.sigev_signo  = OSS_AIO_WRITE_DONE;
       aiop->TIdent = tident;
 
      // Start the operation
      //
         if (!(rc = aio_fsync(O_SYNC, &aiop->sfsAio))) return 0;
         if (errno != EAGAIN && errno != ENOSYS) return -errno;
 
      // Aio failed keep track of the problem (msg every 1024 events). Note
      // that the handling of the counter is sloppy because we do not lock it.
      //
         {int fcnt = AioFailure++;
          if ((fcnt & 0x3ff) == 1) OssEroute.Emsg("aio", errno, "fsync async");
         }
     }
#endif
 
// Execute this request in a synchronous fashion
//
   if ((aiop->Result = Fsync())) aiop->Result = -errno;
 
// Simply call the write completion routine and return as if all went well
//
   aiop->doneWrite();
   return 0;
}

References aiocb::aio_fildes, aiocb::aio_sigevent, XrdOssSys::AioAllOk, XrdSfsAio::doneWrite(), XrdOssDF::fd, Fsync(), OssEroute, XrdSfsAio::Result, XrdSfsAio::sfsAio, XrdSfsAio::TIdent, and XrdOssDF::tident.

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Ftruncate()

int XrdOssFile::Ftruncate ( unsigned long long flen )

virtual

Set the size of the associated file.

Parameters

flen	- The new size of the file.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1318 of file XrdOssApi.cc.

                                                 {
    off_t newlen = flen;
 
    if (sizeof(newlen) < sizeof(flen) && (flen>>31)) return -XRDOSS_E8008;
 
// Note that space adjustment will occur when the file is closed, not here
//
    return (ftruncate(fd, newlen) ?  -errno : XrdOssOK);
    }

References XrdOssDF::fd, ftruncate, XRDOSS_E8008, and XrdOssOK.

getFD()

int XrdOssFile::getFD ( )

inlinevirtual

Return the underlying file descriptor.

Returns

-1 if there is no file descriptor or a non-negative FD number.

Reimplemented from XrdOssDF.

Definition at line 110 of file XrdOssApi.hh.

{return fd;}

References XrdOssDF::fd.

getMmap()

off_t XrdOssFile::getMmap ( void ** addr )

virtual

Return the memory mapped characteristics of the file.

Parameters

addr	- Pointer to where the memory mapped address is to be returned.

Returns

If mapped, the size of the file is returned and it memory location is placed in addr. Otherwise, addr is set to zero and zero is returned. Note that zero length files cannot be memory mapped.

Reimplemented from XrdOssDF.

Definition at line 1266 of file XrdOssApi.cc.

{
   if (mmFile) return (addr ? mmFile->Export(addr) : 1);
   if (addr) *addr = 0;
   return 0;
}

isCompressed()

int XrdOssFile::isCompressed ( char * cxidp = 0 )

virtual

Return file compression charectistics.

Parameters

cxidp

- Pointer to where the compression algorithm name returned.

Returns

If the file is compressed, the region size if returned. Otherwise, zero is returned (file not compressed).

Reimplemented from XrdOssDF.

Definition at line 1287 of file XrdOssApi.cc.

{
    if (cxpgsz)
       {cxidp[0] = cxid[0]; cxidp[1] = cxid[1];
        cxidp[2] = cxid[2]; cxidp[3] = cxid[3];
       }
    return cxpgsz;
}

Open()

int XrdOssFile::Open ( const char * path, int Oflag, mode_t Mode, XrdOucEnv & env )

virtual

Open a file.

Parameters

path	- Pointer to the path of the file to be opened.
Oflag	- Standard open flags.
Mode	- File open mode (ignored unless creating a file).
env	- Reference to environmental information.

Returns

0 upon success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 816 of file XrdOssApi.cc.

{
   unsigned long long popts;
   int retc, mopts;
   char actual_path[MAXPATHLEN+1], *local_path;
   struct stat buf;
 
// Return an error if this object is already open
//
   if (fd >= 0) return -XRDOSS_E8003;
      else cxobj = 0;
 
// Construct the processing options for this path.
//
   popts = XrdOssSS->PathOpts(path);
   if (popts & XRDEXP_STAGE && Env.Get("oss.lcl")) popts &= ~XRDEXP_STAGE;
 
// Generate local path
//
   if (XrdOssSS->lcl_N2N)
      if ((retc = XrdOssSS->lcl_N2N->lfn2pfn(path, actual_path, sizeof(actual_path))))
         return retc;
         else local_path = actual_path;
      else local_path = (char *)path;
 
// Check if this is a read/only filesystem
//
   if (((Oflag & O_ACCMODE) != O_RDONLY) && (popts & XRDEXP_NOTRW))
      {if (popts & XRDEXP_FORCERO) Oflag = O_RDONLY;
          else return OssEroute.Emsg("Open",-XRDOSS_E8005,"open r/w",path);
      }
 
// If we can open the local copy. If not found, try to stage it in if possible.
// Note that stage will regenerate the right local and remote paths.
//
   if ( (fd = (int)Open_ufs(local_path, Oflag, Mode, popts)) == -ENOENT
   && (popts & XRDEXP_REMOTE))
      {if (!(popts & XRDEXP_STAGE))
          return OssEroute.Emsg("Open",-XRDOSS_E8006,"open",path);
       if ((retc = XrdOssSS->Stage(tident, path, Env, Oflag, Mode, popts)))
          return retc;
       fd = (int)Open_ufs(local_path, Oflag, Mode, popts & ~XRDEXP_REMOTE);
      }
 
// This interface supports only regular files. Complain if this is not one.
//
   if (fd >= 0)
      {do {retc = fstat(fd, &buf);} while(retc && errno == EINTR);
       if (!retc && !(buf.st_mode & S_IFREG))
          {close(fd); fd = (buf.st_mode & S_IFDIR ? -EISDIR : -ENOTBLK);}
       if ((Oflag & O_ACCMODE) != O_RDONLY)
          {FSize = buf.st_size; cacheP = XrdOssCache::Find(local_path);}
          else {if (buf.st_mode & XRDSFS_POSCPEND && fd >= 0)
                   {close(fd); fd=-ETXTBSY;}
                FSize = -1; cacheP = 0;
               }
      } else if (fd == -EEXIST)
                {do {retc = stat(local_path,&buf);} while(retc && errno==EINTR);
                 if (!retc && (buf.st_mode & S_IFDIR)) fd = -EISDIR;
                }
 
// See if should memory map this file. For now, extended attributes are only
// needed when memory mapping is enabled and can apply only to specific files.
// So, we read them here should we need them.
//
   if (fd >= 0 && XrdOssSS->tryMmap)
      {XrdOucXAttr<XrdFrcXAttrMem> Info;
       mopts = 0;
       if (!(popts & XRDEXP_NOXATTR) && XrdOssSS->chkMmap)
          Info.Get(local_path, fd);
       if (popts & XRDEXP_MKEEP || Info.Attr.Flags & XrdFrcXAttrMem::memKeep)
          mopts |= OSSMIO_MPRM;
       if (popts & XRDEXP_MLOK  || Info.Attr.Flags & XrdFrcXAttrMem::memLock)
          mopts |= OSSMIO_MLOK;
       if (popts & XRDEXP_MMAP  || Info.Attr.Flags & XrdFrcXAttrMem::memMap)
          mopts |= OSSMIO_MMAP;
       if (mopts) mmFile = XrdOssMio::Map(local_path, fd, mopts);
      } else mmFile = 0;
 
   canClone = !(popts & XRDEXP_NOFICL);
// Return the result of this open
//
   return (fd < 0 ? fd : XrdOssOK);
}

References close, XrdOssDF::fd, XrdOssCache::Find(), fstat, XrdOucEnv::Get(), XrdOssMio::Map(), XrdFrcXAttrMem::memKeep, XrdFrcXAttrMem::memLock, XrdFrcXAttrMem::memMap, Mode, OssEroute, OSSMIO_MLOK, OSSMIO_MMAP, OSSMIO_MPRM, stat, XrdOssDF::tident, XRDEXP_FORCERO, XRDEXP_MKEEP, XRDEXP_MLOK, XRDEXP_MMAP, XRDEXP_NOFICL, XRDEXP_NOTRW, XRDEXP_NOXATTR, XRDEXP_REMOTE, XRDEXP_STAGE, XRDOSS_E8003, XRDOSS_E8005, XRDOSS_E8006, XrdOssOK, XrdOssSS, and XRDSFS_POSCPEND.

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Read() [1/3]

ssize_t XrdOssFile::Read ( off_t offset, size_t size )

virtual

Preread file blocks into the file system cache.

Parameters

offset	- The offset where the read is to start.
size	- The number of bytes to pre-read.

Returns

>= 0 When 0, the request was ignored; otherwise, it has been accepted.

< 0 Failed with -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 945 of file XrdOssApi.cc.

{
 
     if (fd < 0) return (ssize_t)-XRDOSS_E8004;
 
#if defined(__linux__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__))
     posix_fadvise(fd, offset, blen, POSIX_FADV_WILLNEED);
#endif
 
     return 0;  // We haven't implemented this yet!
}

References XrdOssDF::fd, and XRDOSS_E8004.

Referenced by Read().

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Read() [2/3]

ssize_t XrdOssFile::Read ( void * buffer, off_t offset, size_t size )

virtual

Read file bytes into a buffer.

Parameters

buffer	- pointer to buffer where the bytes are to be placed.
offset	- The offset where the read is to start.
size	- The number of bytes to read.

Returns

>= 0 The number of bytes that placed in buffer.

< 0 -errno or -osserr upon failure (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 974 of file XrdOssApi.cc.

{
     ssize_t retval;
 
     if (fd < 0) return (ssize_t)-XRDOSS_E8004;
 
#ifdef XRDOSSCX
     if (cxobj)  
        if (XrdOssSS->DirFlags & XrdOssNOSSDEC) return (ssize_t)-XRDOSS_E8021;
           else   retval = cxobj->Read((char *)buff, blen, offset);
        else 
#endif
             do { retval = pread(fd, buff, blen, offset); }
                while(retval < 0 && errno == EINTR);
 
     return (retval >= 0 ? retval : (ssize_t)-errno);
}

References XrdOssDF::fd, pread, XRDOSS_E8004, XRDOSS_E8021, and XrdOssSS.

Read() [3/3]

int XrdOssFile::Read ( XrdSfsAio * aiop )

virtual

Read file bytes using asynchronous I/O.

Parameters

aiop	- Pointer to async I/O object controlling the I/O.

Returns

0 upon if request started success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 154 of file XrdOssAio.cc.

{
 
#ifdef _POSIX_ASYNCHRONOUS_IO
   EPNAME("AioRead");
   int rc;
 
// Complete the aio request block and do the operation
//
   if (XrdOssSys::AioAllOk)
      {aiop->sfsAio.aio_fildes = fd;
       aiop->sfsAio.aio_sigevent.sigev_signo  = OSS_AIO_READ_DONE;
       aiop->TIdent = tident;
       TRACE(Debug,  "fd=" <<fd <<" read " <<aiop->sfsAio.aio_nbytes <<'@'
                           <<aiop->sfsAio.aio_offset <<" started; aiocb="
                           <<Xrd::hex1 <<aiop);
 
       // Start the operation
       //
          if (!(rc = aio_read(&aiop->sfsAio))) return 0;
          if (errno != EAGAIN && errno != ENOSYS) return -errno;
 
      // Aio failed keep track of the problem (msg every 1024 events). Note
      // that the handling of the counter is sloppy because we do not lock it.
      //
         {int fcnt = AioFailure++;
          if ((fcnt & 0x3ff) == 1) OssEroute.Emsg("aio", errno, "read async");
         }
     }
#endif
 
// Execute this request in a synchronous fashion
//
   aiop->Result = this->Read((void *)aiop->sfsAio.aio_buf,
                              (off_t)aiop->sfsAio.aio_offset,
                             (size_t)aiop->sfsAio.aio_nbytes);
 
// Simple call the read completion routine and return as if all went well
//
   aiop->doneRead();
   return 0;
}

References aiocb::aio_buf, aiocb::aio_fildes, aiocb::aio_nbytes, aiocb::aio_offset, aiocb::aio_sigevent, XrdOssSys::AioAllOk, Debug, XrdSfsAio::doneRead(), EPNAME, XrdOssDF::fd, Xrd::hex1, OssEroute, Read(), XrdSfsAio::Result, XrdSfsAio::sfsAio, XrdSfsAio::TIdent, XrdOssDF::tident, and TRACE.

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ReadRaw()

ssize_t XrdOssFile::ReadRaw ( void * buffer, off_t offset, size_t size )

virtual

Read uncompressed file bytes into a buffer.

Parameters

buffer	- pointer to buffer where the bytes are to be placed.
offset	- The offset where the read is to start.
size	- The number of bytes to read.

Returns

>= 0 The number of bytes that placed in buffer.

< 0 -errno or -osserr upon failure (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1090 of file XrdOssApi.cc.

{
     ssize_t retval;
 
     if (fd < 0) return (ssize_t)-XRDOSS_E8004;
 
#ifdef XRDOSSCX
     if (cxobj)   retval = cxobj->ReadRaw((char *)buff, blen, offset);
        else 
#endif
             do { retval = pread(fd, buff, blen, offset); }
                while(retval < 0 && errno == EINTR);
 
     return (retval >= 0 ? retval : (ssize_t)-errno);
}

References XrdOssDF::fd, pread, and XRDOSS_E8004.

ReadV()

ssize_t XrdOssFile::ReadV ( XrdOucIOVec * readV, int rdvcnt )

virtual

Read file bytes as directed by the read vector.

Parameters

readV	pointer to the array of read requests.
rdvcnt	the number of elements in readV.

Returns

>=0 The numbe of bytes read.

< 0 -errno or -osserr upon failure (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1009 of file XrdOssApi.cc.

{
   ssize_t rdsz, totBytes = 0;
   int i;
 
// For platforms that support fadvise, pre-advise what we will be reading
//
#if (defined(__linux__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__))) && defined(HAVE_ATOMICS)
   EPNAME("ReadV");
   long long begOff, endOff, begLst = -1, endLst = -1;
   int nPR = n;
 
// Indicate we are in preread state and see if we have exceeded the limit
//
   if (XrdOssSS->prDepth
   && AtomicInc((XrdOssSS->prActive)) < XrdOssSS->prQSize && n > 2)
      {int faBytes = 0;
       for (nPR=0;nPR < XrdOssSS->prDepth && faBytes < XrdOssSS->prBytes;nPR++)
           if (readV[nPR].size > 0)
              {begOff = XrdOssSS->prPMask &  readV[nPR].offset;
               endOff = XrdOssSS->prPBits | (readV[nPR].offset+readV[nPR].size);
               rdsz = endOff - begOff + 1;
               if ((begOff > endLst || endOff < begLst)
               &&  rdsz < XrdOssSS->prBytes)
                  {posix_fadvise(fd, begOff, rdsz, POSIX_FADV_WILLNEED);
                   TRACE(Debug,"fadvise(" <<fd <<',' <<begOff <<',' <<rdsz <<')');
                   faBytes += rdsz;
                  }
               begLst = begOff; endLst = endOff;
              }
      }
#endif
 
// Read in the vector and do a pre-advise if we support that
//
   for (i = 0; i < n; i++)
       {do {rdsz = pread(fd, readV[i].data, readV[i].size, readV[i].offset);}
           while(rdsz < 0 && errno == EINTR);
        if (rdsz < 0 || rdsz != readV[i].size)
           {totBytes =  (rdsz < 0 ? -errno : -ESPIPE); break;}
        totBytes += rdsz;
#if (defined(__linux__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__))) && defined(HAVE_ATOMICS)
        if (nPR < n && readV[nPR].size > 0)
           {begOff = XrdOssSS->prPMask &  readV[nPR].offset;
            endOff = XrdOssSS->prPBits | (readV[nPR].offset+readV[nPR].size);
            rdsz = endOff - begOff + 1;
            if ((begOff > endLst || endOff < begLst)
            &&  rdsz <= XrdOssSS->prBytes)
               {posix_fadvise(fd, begOff, rdsz, POSIX_FADV_WILLNEED);
                TRACE(Debug,"fadvise(" <<fd <<',' <<begOff <<',' <<rdsz <<')');
               }
            begLst = begOff; endLst = endOff;
           }
        nPR++;
#endif
       }
 
// All done, return bytes read.
//
#if (defined(__linux__) || (defined(__FreeBSD_kernel__) && defined(__GLIBC__))) && defined(HAVE_ATOMICS)
   if (XrdOssSS->prDepth) AtomicDec((XrdOssSS->prActive));
#endif
   return totBytes;
}

References AtomicDec, AtomicInc, Debug, EPNAME, XrdOssDF::fd, XrdOucIOVec::offset, pread, XrdOucIOVec::size, TRACE, and XrdOssSS.

Write() [1/2]

ssize_t XrdOssFile::Write ( const void * buffer, off_t offset, size_t size )

virtual

Write file bytes from a buffer.

Parameters

buffer	- pointer to buffer where the bytes reside.
offset	- The offset where the write is to start.
size	- The number of bytes to write.

Returns

>= 0 The number of bytes that were written.

< 0 -errno or -osserr upon failure (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 1121 of file XrdOssApi.cc.

{
     ssize_t retval;
 
     if (fd < 0) return (ssize_t)-XRDOSS_E8004;
 
     if (XrdOssSS->MaxSize && (long long)(offset+blen) > XrdOssSS->MaxSize)
        return (ssize_t)-XRDOSS_E8007;
 
     do { retval = pwrite(fd, buff, blen, offset); }
          while(retval < 0 && errno == EINTR);
 
     if (retval < 0) retval = (retval == EBADF && cxobj ? -XRDOSS_E8022 : -errno);
     return retval;
}

References XrdOssDF::fd, pwrite, XRDOSS_E8004, XRDOSS_E8007, XRDOSS_E8022, and XrdOssSS.

Referenced by Write().

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Write() [2/2]

int XrdOssFile::Write ( XrdSfsAio * aiop )

virtual

Write file bytes using asynchronous I/O.

Parameters

aiop	- Pointer to async I/O object controlling the I/O.

Returns

0 upon if request started success or -errno or -osserr (see XrdOssError.hh).

Reimplemented from XrdOssDF.

Definition at line 212 of file XrdOssAio.cc.

{
#ifdef _POSIX_ASYNCHRONOUS_IO
   EPNAME("AioWrite");
   int rc;
 
// Complete the aio request block and do the operation
//
   if (XrdOssSys::AioAllOk)
      {aiop->sfsAio.aio_fildes = fd;
       aiop->sfsAio.aio_sigevent.sigev_signo  = OSS_AIO_WRITE_DONE;
       aiop->TIdent = tident;
       TRACE(Debug, "fd=" <<fd <<" write " <<aiop->sfsAio.aio_nbytes <<'@'
                          <<aiop->sfsAio.aio_offset <<" started; aiocb="
                          <<Xrd::hex1 <<aiop);
 
       // Start the operation
       //
          if (!(rc = aio_write(&aiop->sfsAio))) return 0;
          if (errno != EAGAIN && errno != ENOSYS) return -errno;
 
       // Aio failed keep track of the problem (msg every 1024 events). Note
       // that the handling of the counter is sloppy because we do not lock it.
       //
          {int fcnt = AioFailure++;
           if ((fcnt & 0x3ff) == 1) OssEroute.Emsg("Write",errno,"write async");
          }
      }
#endif
 
// Execute this request in a synchronous fashion
//
   aiop->Result = this->Write((const void *)aiop->sfsAio.aio_buf,
                                     (off_t)aiop->sfsAio.aio_offset,
                                    (size_t)aiop->sfsAio.aio_nbytes);
 
// Simply call the write completion routine and return as if all went well
//
   aiop->doneWrite();
   return 0;
}

References aiocb::aio_buf, aiocb::aio_fildes, aiocb::aio_nbytes, aiocb::aio_offset, aiocb::aio_sigevent, XrdOssSys::AioAllOk, Debug, XrdSfsAio::doneWrite(), EPNAME, XrdOssDF::fd, Xrd::hex1, OssEroute, XrdSfsAio::Result, XrdSfsAio::sfsAio, XrdSfsAio::TIdent, XrdOssDF::tident, TRACE, and Write().

Here is the call graph for this function:

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The documentation for this class was generated from the following files:

• XrdOssApi.hh
• XrdOssAio.cc
• XrdOssApi.cc