XrdSfsFile Class Reference

#include <XrdSfsInterface.hh>

Inheritance diagram for XrdSfsFile:

Collaboration diagram for XrdSfsFile:

Public Types
enum	cpAct {   cpCreate =0 ,   cpDelete ,   cpRestore ,   cpQuery ,   cpTrunc ,   cpWrite }

Public Member Functions
	XrdSfsFile (const char *user=0, int MonID=0)
	XrdSfsFile (XrdOucErrInfo &eInfo)
	XrdSfsFile (XrdSfsFile &wrapF)
virtual	~XrdSfsFile ()
	Destructor.
virtual int	checkpoint (cpAct act, struct iov *range=0, int n=0)
virtual int	Clone (const std::vector< XrdOucCloneSeg > &cVec)
virtual int	Clone (XrdSfsFile &srcFile)
virtual int	close ()=0
virtual int	fctl (const int cmd, const char *args, XrdOucErrInfo &eInfo)=0
virtual int	fctl (const int cmd, int alen, const char *args, const XrdSecEntity *client=0)
virtual const char *	FName ()=0
virtual int	getCXinfo (char cxtype[4], int &cxrsz)=0
virtual int	getMmap (void **Addr, off_t &Size)=0
virtual int	open (const char *fileName, XrdSfsFileOpenMode openMode, mode_t createMode, const XrdSecEntity *client=0, const char *opaque=0)=0
virtual int	pgRead (XrdSfsAio *aioparm, uint64_t opts=0)
virtual XrdSfsXferSize	pgRead (XrdSfsFileOffset offset, char *buffer, XrdSfsXferSize rdlen, uint32_t *csvec, uint64_t opts=0)
virtual int	pgWrite (XrdSfsAio *aioparm, uint64_t opts=0)
virtual XrdSfsXferSize	pgWrite (XrdSfsFileOffset offset, char *buffer, XrdSfsXferSize wrlen, uint32_t *csvec, uint64_t opts=0)
virtual XrdSfsXferSize	read (XrdOucRangeList &rlist)
virtual int	read (XrdSfsAio *aioparm)=0
virtual XrdSfsXferSize	read (XrdSfsFileOffset offset, char *buffer, XrdSfsXferSize size)=0
virtual XrdSfsXferSize	read (XrdSfsFileOffset offset, XrdSfsXferSize size)=0
virtual XrdSfsXferSize	readv (XrdOucIOVec *readV, int rdvCnt)
virtual int	SendData (XrdSfsDio *sfDio, XrdSfsFileOffset offset, XrdSfsXferSize size)
virtual void	setXio (XrdSfsXio *xioP)
virtual int	stat (struct stat *buf)=0
virtual int	sync ()=0
virtual int	sync (XrdSfsAio *aiop)=0
virtual int	truncate (XrdSfsFileOffset fsize)=0
virtual int	write (XrdSfsAio *aioparm)=0
virtual XrdSfsXferSize	write (XrdSfsFileOffset offset, const char *buffer, XrdSfsXferSize size)=0
virtual XrdSfsXferSize	writev (XrdOucIOVec *writeV, int wdvCnt)

Public Attributes
XrdOucErrInfo &	error

Static Public Attributes
static const uint64_t	Verify = 0x8000000000000000ULL
	Options for pgRead() and pgWrite() as noted below.

Detailed Description

Definition at line 375 of file XrdSfsInterface.hh.

Member Enumeration Documentation

cpAct

enum XrdSfsFile::cpAct

Create, delete, query, rollback a file checkpoint or perform an action.

Parameters

act	- The operation to be performed (see cpAct enum below).
range	- Use and requirement vary by function: cpCreate - Create a new checkpoint, one must not exist. Parameters ignored, not applicable. cpDelete - Delete an existing checkpoint, one must exist. Parameters ignored, not applicable. cpQuery - Where result is to be returned: range[0].offset - Amount currently in use. range[0].length - Maximum total length cpRestore - Restore data from checkpoint and delete it. Parameters ignored, not applicable. cpTrunc - Offset target for truncation. range[0].offset - Offset for truncations. cpWrite - Offset/lengths of the file to be checkpointed. The checkpoint must exist via previous cpCreate.
n	- Number of elements in range. Applies only to cpWrite.

Returns

One of SFS_OK or SFS_ERROR only.

Enumerator
cpCreate	Create a checkpoint, one must not be active.
cpDelete	Delete an existing checkpoint.
cpRestore	Restore an active checkpoint and delete it.
cpQuery	Return checkpoint limits.
cpTrunc	Truncate a file within checkpoint.
cpWrite	Add data to an existing checkpoint.

Definition at line 444 of file XrdSfsInterface.hh.

           {cpCreate=0,   
            cpDelete,     
            cpRestore,    
            cpQuery,      
            cpTrunc,      
            cpWrite       
           };

Constructor & Destructor Documentation

XrdSfsFile() [1/3]

XrdSfsFile::XrdSfsFile ( const char * user = 0, int MonID = 0 )

inline

Constructor (user and MonID are the ones passed to newFile()!). This constructor should only be used by base plugins. Plugins that wrap an SfsFile should use the second version of the constructor shown below.

Parameters

user	- Text identifying the client responsible for this call. The pointer may be null if identification is missing.
MonID	- The monitoring identifier assigned to this and all future requests using the returned object.

Definition at line 822 of file XrdSfsInterface.hh.

                                 : error(*(new XrdOucErrInfo(user, MonID)))
                                 {lclEI = &error; pgwrEOF = 0;}

References error.

Referenced by XrdBwmFile::XrdBwmFile(), XrdDigFile::XrdDigFile(), XrdOfsFile::XrdOfsFile(), XrdSfsFile(), XrdSfsNativeFile::XrdSfsNativeFile(), XrdSsiFile::XrdSsiFile(), XrdOfsFile::Clone(), and Clone().

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XrdSfsFile() [2/3]

XrdSfsFile::XrdSfsFile ( XrdSfsFile & wrapF )

inline

Constructor for plugins that wrap another SFS plugin. This constructor inherits the error object from a wrapped XrdSfsFile object so that only one identical error object exists for all file objects in the chain.

Parameters

wrapF

- Reference to the file object being wrapped.

Definition at line 834 of file XrdSfsInterface.hh.

                                 : error(wrapF.error), lclEI(0), pgwrEOF(0) {}

References XrdSfsFile(), and error.

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XrdSfsFile() [3/3]

XrdSfsFile::XrdSfsFile ( XrdOucErrInfo & eInfo )

inline

Constructor for base plugins that predefined an error object. This is a convenience constructor for base plugins only.

Parameters

eInfo

- Reference to the error object to use.

Definition at line 844 of file XrdSfsInterface.hh.

                                 : error(eInfo), lclEI(0), pgwrEOF(0) {}

References error.

~XrdSfsFile()

virtual XrdSfsFile::~XrdSfsFile ( )

inlinevirtual

Destructor.

Definition at line 851 of file XrdSfsInterface.hh.

{if (lclEI) delete lclEI;}

Member Function Documentation

checkpoint()

int XrdSfsFile::checkpoint ( cpAct act, struct iov * range = 0, int n = 0 )

virtual

Reimplemented in XrdOfsFile, and XrdThrottle::File.

Definition at line 61 of file XrdSfsInterface.cc.

{
// Provide reasonable answers
//
   switch(act)
         {case cpCreate:  error.setErrInfo(EDQUOT,"Checkpoint quota exceeded.");
                          break;
          case cpDelete:
          case cpRestore: error.setErrInfo(ENOENT,"Checkpoint does not exist.");
                          break;
          default:        error.setErrInfo(EINVAL,"Invalid checkpoint request.");
                          break;
         }
   return SFS_ERROR;
}

References cpCreate, cpDelete, cpRestore, error, and SFS_ERROR.

Clone() [1/2]

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

virtual

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

Parameters

cVec	- A vector of struct XrdOucCloneSeg describing the action.

Returns

One of SFS_OK or SFS_ERROR.

Reimplemented in XrdOfsFile.

Definition at line 88 of file XrdSfsInterface.cc.

{
   (void)cVec;
   error.setErrInfo(ENOTSUP, "Not supported.");
   return SFS_ERROR;
}

References error, and SFS_ERROR.

Clone() [2/2]

int XrdSfsFile::Clone ( XrdSfsFile & 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

One of SFS_OK or SFS_ERROR.

Reimplemented in XrdOfsFile.

Definition at line 81 of file XrdSfsInterface.cc.

{
   (void)srcFile;
   error.setErrInfo(ENOTSUP, "Not supported.");
   return SFS_ERROR;
}

References XrdSfsFile(), error, and SFS_ERROR.

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close()

virtual int XrdSfsFile::close ( )

pure virtual

Close the file.

Returns

One of SFS_OK or SFS_ERROR.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

fctl() [1/2]

virtual int XrdSfsFile::fctl ( const int cmd, const char * args, XrdOucErrInfo & eInfo )

pure virtual

Execute a special operation on the file (version 1)

Parameters

cmd	- The operation to be performed (see below). SFS_FCTL_GETFD Return file descriptor if possible SFS_FCTL_STATV Reserved for future use.
args	- specific arguments to cmd SFS_FCTL_GETFD Set to zero.
eInfo	- The object where error info or results are to be returned. This is legacy and the error onject may be used as well.

Returns

If an error occurs or the operation is not support, SFS_ERROR should be returned with error.code set to errno. Otherwise, SFS_FCTL_GETFD error.code holds the real file descriptor number If the value is negative, sendfile() is not used. If the value is SFS_SFIO_FDVAL then the SendData() method is used for future read requests.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

Referenced by XrdXrootdFile::XrdXrootdFile(), and XrdThrottle::File::FileSystem.

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fctl() [2/2]

int XrdSfsFile::fctl ( const int cmd, int alen, const char * args, const XrdSecEntity * client = 0 )

virtual

Execute a special operation on the file (version 2)

Parameters

cmd	- The operation to be performed: SFS_FCTL_SPEC1 Perform implementation defined action V1 SFS_FCTL_SPEC2 Perform implementation defined action V2
alen	- Length of data pointed to by args.
args	- Data sent with request, zero if alen is zero.
client	- Client's identify (see common description).

Returns

SFS_OK a null response is sent.

SFS_DATA error.code length of the data to be sent. error.message contains the data to be sent. o/w one of SFS_ERROR, SFS_REDIRECT, or SFS_STALL.

Reimplemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

Definition at line 99 of file XrdSfsInterface.cc.

{
  (void)cmd; (void)alen; (void)args; (void)client;
  return SFS_OK;
}

References SFS_OK.

FName()

virtual const char * XrdSfsFile::FName ( )

pure virtual

Get the file path.

Returns

Null terminated string of the path used in open().

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

getCXinfo()

virtual int XrdSfsFile::getCXinfo ( char cxtype[4], int & cxrsz )

pure virtual

Get compression information for the file.

Parameters

cxtype	- Place where the compression algorithm name is to be placed
cxrsz	- Place where the compression page size is to be returned

Returns

One of the valid SFS return codes described above. If the file is not compressed or an error is returned, cxrsz must be set to 0.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

getMmap()

virtual int XrdSfsFile::getMmap ( void ** Addr, off_t & Size )

pure virtual

Get file's memory mapping if one exists (memory mapped files only).

Parameters

Addr	- Place where the starting memory address is returned.
Size	- Place where the file's size is returned.

Returns

SFS_OK when the file is memory mapped or any other code otherwise.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

Referenced by XrdXrootdFile::XrdXrootdFile().

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open()

virtual int XrdSfsFile::open ( const char * fileName, XrdSfsFileOpenMode openMode, mode_t createMode, const XrdSecEntity * client = 0, const char * opaque = 0 )

pure virtual

Open a file.

Parameters

fileName	- Pointer to the path of the file to be opened.
openMode	- Flags indicating how the open is to be handled. SFS_O_CREAT create the file SFS_O_CREATAT create the file in a perticular FS SFS_O_MKPTH Make directory path if missing SFS_O_NOWAIT do not impose operational delays SFS_O_NOTPC do not allow TPC operation SFS_O_POSC persist only on successful close SFS_O_RAWIO allow client-side decompression SFS_O_RDONLY open read/only SFS_O_RDWR open read/write SFS_O_REPLICA Open for replication SFS_O_RESET Reset any cached information SFS_O_TRUNC truncate existing file to zero length SFS_O_WRONLY open write/only
createMode	- The file's mode if it will be created.
client	- Client's identify (see common description).
opaque	- path's CGI information (see common description).

Returns

One of SFS_OK, SFS_ERROR, SFS_REDIRECT, SFS_STALL, or SFS_STARTED

Note

When SFS_O_CREATAT is specified, the CGI should contain an element oss.coloc=<path> where <path> is URL encoded and determines the filesystem in which the new file should be created.

Implemented in XrdBwmFile, XrdOfsFile, XrdSsiFile, and XrdThrottle::File.

pgRead() [1/2]

XrdSfsXferSize XrdSfsFile::pgRead ( XrdSfsAio * aioparm, uint64_t opts = 0 )

virtual

Read file pages and checksums using asynchronous I/O.

Parameters

aioparm	- Pointer to async I/O object controlling the I/O.
opts	- Processing options (see above).

Returns

SFS_OK Request accepted and will be scheduled.

SFS_ERROR File could not be read, error holds the reason.

Reimplemented in XrdOfsFile, and XrdThrottle::File.

Definition at line 135 of file XrdSfsInterface.cc.

{
   aioparm->Result = this->pgRead((XrdSfsFileOffset)aioparm->sfsAio.aio_offset,
                                            (char *)aioparm->sfsAio.aio_buf,
                                    (XrdSfsXferSize)aioparm->sfsAio.aio_nbytes,
                                                    aioparm->cksVec, opts);
   aioparm->doneRead();
   return SFS_OK;
}

References aiocb::aio_buf, aiocb::aio_nbytes, aiocb::aio_offset, XrdSfsAio::cksVec, XrdSfsAio::doneRead(), opts, pgRead(), XrdSfsAio::Result, SFS_OK, and XrdSfsAio::sfsAio.

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pgRead() [2/2]

XrdSfsXferSize XrdSfsFile::pgRead ( XrdSfsFileOffset offset, char * buffer, XrdSfsXferSize rdlen, uint32_t * csvec, uint64_t opts = 0 )

virtual

Read file pages into a buffer and return corresponding checksums.

Parameters

offset	- The offset where the read is to start. It may be unaligned with certain caveats relative to csvec.
buffer	- pointer to buffer where the bytes are to be placed.
rdlen	- The number of bytes to read. The amount must be an integral number of XrdSfsPage::Size bytes.
csvec	- A vector of entries to be filled with the cooresponding CRC32C checksum for each page. However, if the offset is unaligned, then csvec[0] contains the crc for the page fragment that brings it to alignment for csvec[1]. It must be sized to hold all aligned XrdSys::Pagesize crc's plus additional ones for leading and ending page fragments, if any.
opts	- Processing options (see above).

Returns

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

SFS_ERROR File could not be read, error holds the reason.

Reimplemented in XrdOfsFile, and XrdThrottle::File.

Definition at line 112 of file XrdSfsInterface.cc.

{
   XrdSfsXferSize bytes;
 
// Read the data into the buffer
//
   if ((bytes = read(offset, buffer, rdlen)) <= 0) return bytes;
 
// Generate the crc's.
//
   XrdOucPgrwUtils::csCalc(buffer, offset, bytes, csvec);
 
// All done
//
   return bytes;
}

References XrdOucPgrwUtils::csCalc(), opts, and read.

Referenced by pgRead().

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pgWrite() [1/2]

XrdSfsXferSize XrdSfsFile::pgWrite ( XrdSfsAio * aioparm, uint64_t opts = 0 )

virtual

Write file pages and checksums using asynchronous I/O.

Parameters

aioparm	- Pointer to async I/O object controlling the I/O.
opts	- Processing options (see above).

Returns

SFS_OK Request accepted and will be scheduled.

SFS_ERROR File could not be read, error holds the reason.

Reimplemented in XrdOfsFile, and XrdThrottle::File.

Definition at line 178 of file XrdSfsInterface.cc.

{
   aioparm->Result = this->pgWrite((XrdSfsFileOffset)aioparm->sfsAio.aio_offset,
                                             (char *)aioparm->sfsAio.aio_buf,
                                     (XrdSfsXferSize)aioparm->sfsAio.aio_nbytes,
                                                     aioparm->cksVec, opts);
   aioparm->doneWrite();
   return SFS_OK;
}

References aiocb::aio_buf, aiocb::aio_nbytes, aiocb::aio_offset, XrdSfsAio::cksVec, XrdSfsAio::doneWrite(), opts, pgWrite(), XrdSfsAio::Result, SFS_OK, and XrdSfsAio::sfsAio.

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pgWrite() [2/2]

XrdSfsXferSize XrdSfsFile::pgWrite ( XrdSfsFileOffset offset, char * buffer, XrdSfsXferSize wrlen, uint32_t * csvec, uint64_t opts = 0 )

virtual

Write file pages into a file with corresponding checksums.

Parameters

offset	- The offset where the write is to start. It may be unaligned with certain caveats relative to csvec.
buffer	- pointer to buffer containing the bytes to write.
wrlen	- The number of bytes to write. If amount is not an integral number of XrdSys::PageSize bytes, then this must be the last write to the file at or above the offset.
csvec	- A vector which contains the corresponding CRC32 checksum for each page or page fragment. If offset is unaligned then csvec[0] is the crc of the leading fragment to align the subsequent full page who's crc is in csvec[1]. It must be sized to hold all aligned XrdSys::Pagesize crc's plus additional ones for leading and ending page fragments, if any.
opts	- Processing options (see above).

Returns

>= 0 The number of bytes written.

SFS_ERROR File could not be read, error holds the reason.

Reimplemented in XrdOfsFile, and XrdThrottle::File.

Definition at line 149 of file XrdSfsInterface.cc.

{
 
// If we have a checksum vector and verify is on, do verification.
//
   if (opts & Verify)
      {XrdOucPgrwUtils::dataInfo dInfo(buffer, csvec, offset, wrlen);
       off_t badoff;
       int   badlen;
 
       if (!XrdOucPgrwUtils::csVer(dInfo, badoff, badlen))
          {char eMsg[512];
           snprintf(eMsg, sizeof(eMsg), "Checksum error at offset %lld.", (long long) badoff);
           error.setErrInfo(EDOM, eMsg);
           return SFS_ERROR;
          }
      }
 
// Now just return the result of a plain write
//
   return write(offset, buffer, wrlen);
}

References XrdOucPgrwUtils::csVer(), eMsg, error, opts, SFS_ERROR, Verify, and write.

Referenced by pgWrite().

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read() [1/4]

XrdSfsXferSize XrdSfsFile::read ( XrdOucRangeList & rlist )

virtual

Preread a list of file blocks into the file system cache.

Parameters

rlist

- A list of byte ranges to pre-read.

Returns

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

SFS_ERROR File could not be preread, error holds the reason.

Definition at line 192 of file XrdSfsInterface.cc.

{
   for (auto it = rlist.begin(); it != rlist.end(); it++)
       if (read(it->offset, it->size) == SFS_ERROR) return SFS_ERROR;
   return 1;
}

References read, and SFS_ERROR.

read() [2/4]

virtual int XrdSfsFile::read ( XrdSfsAio * aioparm )

pure virtual

Read file bytes using asynchronous I/O.

Parameters

aioparm

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

Returns

SFS_OK Request accepted and will be scheduled.

SFS_ERROR File could not be read, error holds the reason.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

read() [3/4]

virtual XrdSfsXferSize XrdSfsFile::read ( XrdSfsFileOffset offset, char * buffer, XrdSfsXferSize size )

pure virtual

Read file bytes into a buffer.

Parameters

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

Returns

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

SFS_ERROR File could not be read, error holds the reason.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

read() [4/4]

virtual XrdSfsXferSize XrdSfsFile::read ( XrdSfsFileOffset offset, XrdSfsXferSize size )

pure virtual

Preread a file block 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.

SFS_ERROR File could not be preread, error holds the reason.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

readv()

XrdSfsXferSize XrdSfsFile::readv ( XrdOucIOVec * readV, int rdvCnt )

virtual

Given an array of read requests (size rdvCnt), read them from the file and place the contents consecutively in the provided buffer. A dumb default implementation is supplied but should be replaced to increase performance.

Parameters

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

Returns

>=0 The numbe of bytes placed into the buffer.

SFS_ERROR File could not be read, error holds the reason.

Reimplemented in XrdDigFile, XrdOfsFile, XrdSfsNativeFile, and XrdSsiFile.

Definition at line 203 of file XrdSfsInterface.cc.

{
   XrdSfsXferSize rdsz, totbytes = 0;
 
   for (int i = 0; i < rdvCnt; i++)
       {rdsz = read(readV[i].offset,
                    readV[i].data, readV[i].size);
        if (rdsz != readV[i].size)
           {if (rdsz < 0) return rdsz;
            error.setErrInfo(ESPIPE,"read past eof");
            return SFS_ERROR;
           }
        totbytes += rdsz;
       }
   return totbytes;
}

References error, read, and SFS_ERROR.

SendData()

int XrdSfsFile::SendData ( XrdSfsDio * sfDio, XrdSfsFileOffset offset, XrdSfsXferSize size )

virtual

Send file bytes via a XrdSfsDio sendfile object to a client (optional).

Parameters

sfDio	- Pointer to the sendfile object for data transfer.
offset	- The offset where the read is to start.
size	- The number of bytes to read and send.

Returns

SFS_ERROR File not read, error object has reason.

SFS_OK Either data has been successfully sent via sfDio or no data has been sent and a normal read() should be issued.

Reimplemented in XrdSsiFile, and XrdThrottle::File.

Definition at line 225 of file XrdSfsInterface.cc.

{
   (void)sfDio; (void)offset; (void)size;
   return SFS_OK;
}

References SFS_OK.

setXio()

virtual void XrdSfsFile::setXio ( XrdSfsXio * xioP )

inlinevirtual

Enable exchange buffer I/O for write calls.

Parameters

xioP	- Pointer to the XrdSfsXio object to be used for buffer exchanges.

Reimplemented in XrdSsiFile.

Definition at line 809 of file XrdSfsInterface.hh.

{ (void)xioP; }

stat()

virtual int XrdSfsFile::stat ( struct stat * buf )

pure virtual

Return state information on the file.

Parameters

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

Returns

One of SFS_OK, SFS_ERROR, SFS_REDIRECT, or SFS_STALL. When SFS_OK is returned, buf must hold stat information.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

References stat().

Referenced by XrdXrootdFile::XrdXrootdFile(), and stat().

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sync() [1/2]

virtual int XrdSfsFile::sync ( )

pure virtual

Make sure all outstanding data is actually written to the file (sync).

Returns

One of SFS_OK, SFS_ERROR, SFS_REDIRECT, SFS_STALL, or SFS_STARTED

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

sync() [2/2]

virtual int XrdSfsFile::sync ( XrdSfsAio * aiop )

pure virtual

Make sure all outstanding data is actually written to the file (async).

Returns

SFS_OK Request accepted and will be scheduled.

SFS_ERROR Request could not be accepted, return error has reason.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

truncate()

virtual int XrdSfsFile::truncate ( XrdSfsFileOffset fsize )

pure virtual

Truncate the file.

Parameters

fsize

- The size that the file is to have.

Returns

One of SFS_OK, SFS_ERROR, SFS_REDIRECT, or SFS_STALL

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

write() [1/2]

virtual int XrdSfsFile::write ( XrdSfsAio * aioparm )

pure virtual

Write file bytes using asynchronous I/O.

Parameters

aioparm

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

Returns

0 Request accepted and will be scheduled.

!0 Request not accepted, returned value is errno.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

write() [2/2]

virtual XrdSfsXferSize XrdSfsFile::write ( XrdSfsFileOffset offset, const char * buffer, XrdSfsXferSize size )

pure virtual

Write file bytes from a buffer.

Parameters

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

Returns

>= 0 The number of bytes that were written.

SFS_ERROR File could not be written, error holds the reason.

Implemented in XrdBwmFile, XrdDigFile, XrdOfsFile, XrdSfsNativeFile, XrdSsiFile, and XrdThrottle::File.

writev()

XrdSfsXferSize XrdSfsFile::writev ( XrdOucIOVec * writeV, int wdvCnt )

virtual

Given an array of write requests (size wdvcnt), write them to the file from the provided associated buffer. A dumb default implementation is supplied but should be replaced to increase performance.

Parameters

writeV	pointer to the array of write requests.
wdvCnt	the number of elements in writeV.

Returns

>=0 The total number of bytes written to the file.

SFS_ERROR File could not be written, error holds the reason.

Definition at line 237 of file XrdSfsInterface.cc.

{
    XrdSfsXferSize wrsz, totbytes = 0;
 
    for (int i = 0; i < wdvCnt; i++)
        {wrsz = write(writeV[i].offset,
                      writeV[i].data, writeV[i].size);
         if (wrsz != writeV[i].size)
            {if (wrsz < 0) return wrsz;
            error.setErrInfo(ESPIPE,"write past eof");
            return SFS_ERROR;
           }
        totbytes += wrsz;
       }
   return totbytes;
}

References error, SFS_ERROR, and write.

Member Data Documentation

error

XrdOucErrInfo& XrdSfsFile::error

The error object is used to return details whenever something other than SFS_OK is returned from the methods in this class, when noted.

Definition at line 384 of file XrdSfsInterface.hh.

Referenced by XrdSfsFile(), XrdSfsFile(), XrdSfsFile(), XrdXrootdFile::XrdXrootdFile(), XrdOfsFile::checkpoint(), checkpoint(), XrdOfsFile::Clone(), XrdOfsFile::Clone(), Clone(), Clone(), XrdDigFile::close(), XrdOfsFile::close(), XrdSfsNativeFile::close(), XrdOfsFile::fctl(), XrdThrottle::File::fctl(), XrdThrottle::File::getMmap(), XrdBwmFile::open(), XrdDigFile::open(), XrdOfsFile::open(), XrdSfsNativeFile::open(), XrdSsiFile::open(), XrdThrottle::File::open(), XrdOfsFile::pgRead(), XrdOfsFile::pgRead(), XrdOfsFile::pgWrite(), XrdOfsFile::pgWrite(), pgWrite(), XrdDigFile::read(), XrdOfsFile::read(), XrdOfsFile::read(), XrdOfsFile::read(), XrdSfsNativeFile::read(), XrdDigFile::readv(), XrdOfsFile::readv(), readv(), XrdSfsNativeFile::readv(), XrdSsiFile::readv(), XrdDigFile::stat(), XrdOfsFile::stat(), XrdSfsNativeFile::stat(), XrdOfsFile::sync(), XrdSfsNativeFile::sync(), XrdSsiFile::sync(), XrdSsiFile::sync(), XrdBwmFile::truncate(), XrdOfsFile::truncate(), XrdSfsNativeFile::truncate(), XrdOfsFile::write(), XrdOfsFile::write(), XrdSfsNativeFile::write(), and writev().

Verify

const uint64_t XrdSfsFile::Verify = 0x8000000000000000ULL

static

Options for pgRead() and pgWrite() as noted below.

all: Verify checksums

Definition at line 550 of file XrdSfsInterface.hh.

Referenced by XrdOfsFile::pgRead(), XrdOfsFile::pgRead(), XrdOfsFile::pgWrite(), XrdOfsFile::pgWrite(), and pgWrite().

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

• XrdSfsInterface.hh
• XrdSfsInterface.cc