590 lines
13 KiB
C
590 lines
13 KiB
C
/******************************************************************************
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* $Id$
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*
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* Copyright (c) 2005-2008 Transmission authors and contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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#ifndef WIN32
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#define HAVE_GETRLIMIT
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#endif
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#include <assert.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef SYS_DARWIN
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#include <fcntl.h>
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#endif
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#ifdef HAVE_FALLOCATE
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#include <linux/falloc.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef HAVE_GETRLIMIT
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#include <sys/time.h> /* getrlimit */
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#include <sys/resource.h> /* getrlimit */
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#endif
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#include <unistd.h>
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#include <fcntl.h> /* O_LARGEFILE */
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#include <event.h>
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#include <evutil.h>
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#include "transmission.h"
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#include "fdlimit.h"
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#include "list.h"
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#include "net.h"
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#include "platform.h" /* tr_lock */
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#include "utils.h"
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#define dbgmsg( ... ) \
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do { \
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if( tr_deepLoggingIsActive( ) ) \
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tr_deepLog( __FILE__, __LINE__, NULL, __VA_ARGS__ ); \
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} while( 0 )
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/**
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***
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**/
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enum
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{
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TR_MAX_OPEN_FILES = 16, /* real files, not sockets */
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NOFILE_BUFFER = 512, /* the process' number of open files is
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globalMaxPeers + NOFILE_BUFFER */
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};
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struct tr_openfile
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{
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unsigned int isCheckedOut : 1;
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unsigned int isWritable : 1;
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unsigned int closeWhenDone : 1;
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char filename[MAX_PATH_LENGTH];
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int fd;
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uint64_t date;
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};
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struct tr_fd_s
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{
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int socketCount;
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int socketMax;
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tr_lock * lock;
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struct tr_openfile open[TR_MAX_OPEN_FILES];
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};
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static struct tr_fd_s * gFd = NULL;
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/***
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****
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**** Local Files
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****
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***/
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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static int
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preallocateFile( const char * filename, uint64_t length )
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{
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int success = 0;
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#ifdef WIN32
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HANDLE hFile = CreateFile( filename, GENERIC_WRITE, 0, 0, CREATE_NEW, 0, 0 );
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if( hFile != INVALID_HANDLE_VALUE )
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{
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LARGE_INTEGER li;
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li.QuadPart = length;
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success = SetFilePointerEx( hFile, li, NULL, FILE_BEGIN ) && SetEndOfFile( hFile );
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CloseHandle( hFile );
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}
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#else
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int flags = O_RDWR | O_CREAT | O_LARGEFILE;
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int fd = open( filename, flags, 0666 );
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if( fd >= 0 )
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{
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# ifdef HAVE_FALLOCATE
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success = !fallocate( fd, FALLOC_FL_KEEP_SIZE, 0, length );
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# elif defined(HAVE_POSIX_FALLOCATE)
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success = !posix_fallocate( fd, 0, length );
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# elif defined(SYS_DARWIN)
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fstore_t fst;
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fst.fst_flags = F_ALLOCATECONTIG;
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fst.fst_posmode = F_PEOFPOSMODE;
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fst.fst_offset = 0;
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fst.fst_length = length;
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fst.fst_bytesalloc = 0;
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success = !fcntl( fd, F_PREALLOCATE, &fst );
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# else
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#warning no known method to preallocate files on this platform
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success = 0;
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# endif
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close( fd );
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}
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#endif
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return success;
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}
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/**
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* returns 0 on success, or an errno value on failure.
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* errno values include ENOENT if the parent folder doesn't exist,
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* plus the errno values set by tr_mkdirp() and open().
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*/
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static int
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TrOpenFile( int i,
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const char * folder,
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const char * torrentFile,
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int doWrite,
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int doPreallocate,
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uint64_t desiredFileSize )
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{
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struct tr_openfile * file = &gFd->open[i];
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int flags;
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char * filename;
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struct stat sb;
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int alreadyExisted;
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/* confirm the parent folder exists */
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if( stat( folder, &sb ) || !S_ISDIR( sb.st_mode ) )
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return ENOENT;
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/* create subfolders, if any */
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filename = tr_buildPath( folder, torrentFile, NULL );
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if( doWrite )
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{
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char * tmp = tr_dirname( filename );
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const int err = tr_mkdirp( tmp, 0777 ) ? errno : 0;
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tr_free( tmp );
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if( err ) {
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tr_free( filename );
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return err;
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}
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}
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alreadyExisted = !stat( filename, &sb ) && S_ISREG( sb.st_mode );
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if( doWrite && !alreadyExisted && doPreallocate )
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if( preallocateFile( filename, desiredFileSize ) )
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tr_inf( _( "Preallocated file \"%s\"" ), filename );
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/* open the file */
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flags = doWrite ? ( O_RDWR | O_CREAT ) : O_RDONLY;
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#ifdef O_LARGEFILE
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flags |= O_LARGEFILE;
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#endif
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#ifdef WIN32
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flags |= O_BINARY;
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#endif
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file->fd = open( filename, flags, 0666 );
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if( file->fd == -1 )
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{
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const int err = errno;
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tr_err( _( "Couldn't open \"%1$s\": %2$s" ), filename,
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tr_strerror( err ) );
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tr_free( filename );
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return err;
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}
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tr_free( filename );
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return 0;
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}
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static int
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fileIsOpen( const struct tr_openfile * o )
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{
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return o->fd >= 0;
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}
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static void
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TrCloseFile( int i )
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{
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struct tr_openfile * o = &gFd->open[i];
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assert( i >= 0 );
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assert( i < TR_MAX_OPEN_FILES );
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assert( fileIsOpen( o ) );
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close( o->fd );
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o->fd = -1;
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o->isCheckedOut = 0;
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}
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static int
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fileIsCheckedOut( const struct tr_openfile * o )
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{
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return fileIsOpen( o ) && o->isCheckedOut;
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}
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/* returns an fd on success, or a -1 on failure and sets errno */
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int
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tr_fdFileCheckout( const char * folder,
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const char * torrentFile,
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int doWrite,
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int doPreallocate,
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uint64_t desiredFileSize )
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{
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int i, winner = -1;
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struct tr_openfile * o;
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char * filename;
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assert( folder && *folder );
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assert( torrentFile && *torrentFile );
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assert( doWrite == 0 || doWrite == 1 );
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filename = tr_buildPath( folder, torrentFile, NULL );
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dbgmsg( "looking for file '%s', writable %c", filename,
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doWrite ? 'y' : 'n' );
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tr_lockLock( gFd->lock );
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/* Is it already open? */
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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{
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o = &gFd->open[i];
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if( !fileIsOpen( o ) )
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continue;
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if( strcmp( filename, o->filename ) )
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continue;
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if( fileIsCheckedOut( o ) )
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{
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dbgmsg( "found it! it's open, but checked out. waiting..." );
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tr_lockUnlock( gFd->lock );
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tr_wait( 200 );
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tr_lockLock( gFd->lock );
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i = -1; /* reloop */
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continue;
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}
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if( doWrite && !o->isWritable )
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{
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dbgmsg(
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"found it! it's open and available, but isn't writable. closing..." );
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TrCloseFile( i );
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break;
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}
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dbgmsg( "found it! it's ready for use!" );
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winner = i;
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break;
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}
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dbgmsg(
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"it's not already open. looking for an open slot or an old file." );
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while( winner < 0 )
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{
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uint64_t date = tr_date( ) + 1;
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/* look for the file that's been open longest */
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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{
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o = &gFd->open[i];
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if( !fileIsOpen( o ) )
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{
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winner = i;
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dbgmsg( "found an empty slot in %d", winner );
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break;
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}
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if( date > o->date )
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{
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date = o->date;
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winner = i;
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}
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}
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if( winner >= 0 )
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{
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if( fileIsOpen( &gFd->open[winner] ) )
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{
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dbgmsg( "closing file '%s', slot #%d",
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gFd->open[winner].filename,
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winner );
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TrCloseFile( winner );
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}
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}
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else
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{
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dbgmsg(
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"everything's full! waiting for someone else to finish something" );
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tr_lockUnlock( gFd->lock );
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tr_wait( 200 );
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tr_lockLock( gFd->lock );
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}
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}
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assert( winner >= 0 );
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o = &gFd->open[winner];
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if( !fileIsOpen( o ) )
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{
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const int err = TrOpenFile( winner, folder, torrentFile, doWrite, doPreallocate, desiredFileSize );
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if( err ) {
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tr_lockUnlock( gFd->lock );
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tr_free( filename );
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errno = err;
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return -1;
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}
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dbgmsg( "opened '%s' in slot %d, doWrite %c", filename, winner,
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doWrite ? 'y' : 'n' );
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tr_strlcpy( o->filename, filename, sizeof( o->filename ) );
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o->isWritable = doWrite;
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}
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dbgmsg( "checking out '%s' in slot %d", filename, winner );
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o->isCheckedOut = 1;
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o->closeWhenDone = 0;
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o->date = tr_date( );
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tr_free( filename );
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tr_lockUnlock( gFd->lock );
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return o->fd;
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}
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void
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tr_fdFileReturn( int fd )
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{
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int i;
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tr_lockLock( gFd->lock );
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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{
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struct tr_openfile * o = &gFd->open[i];
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if( o->fd != fd )
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continue;
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dbgmsg( "releasing file '%s' in slot #%d", o->filename, i );
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o->isCheckedOut = 0;
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if( o->closeWhenDone )
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TrCloseFile( i );
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break;
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}
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tr_lockUnlock( gFd->lock );
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}
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void
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tr_fdFileClose( const char * filename )
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{
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int i;
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tr_lockLock( gFd->lock );
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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{
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struct tr_openfile * o = &gFd->open[i];
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if( !fileIsOpen( o ) || strcmp( filename, o->filename ) )
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continue;
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dbgmsg( "tr_fdFileClose closing '%s'", filename );
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if( !o->isCheckedOut )
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{
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dbgmsg( "not checked out, so closing it now... '%s'", filename );
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TrCloseFile( i );
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}
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else
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{
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dbgmsg(
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"flagging file '%s', slot #%d to be closed when checked in",
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gFd->open[i].filename, i );
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o->closeWhenDone = 1;
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}
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}
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tr_lockUnlock( gFd->lock );
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}
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/***
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****
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**** Sockets
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****
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***/
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static int
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getSocketMax( struct tr_fd_s * gFd )
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{
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return gFd->socketMax;
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}
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int
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tr_fdSocketCreate( int type )
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{
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int s = -1;
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tr_lockLock( gFd->lock );
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if( gFd->socketCount < getSocketMax( gFd ) )
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if( ( s = socket( AF_INET, type, 0 ) ) < 0 )
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tr_err( _( "Couldn't create socket: %s" ),
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tr_strerror( sockerrno ) );
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if( s > -1 )
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++gFd->socketCount;
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assert( gFd->socketCount >= 0 );
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tr_lockUnlock( gFd->lock );
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return s;
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}
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int
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tr_fdSocketAccept( int b,
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struct in_addr * addr,
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tr_port_t * port )
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{
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int s = -1;
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unsigned int len;
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struct sockaddr_in sock;
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assert( addr );
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assert( port );
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tr_lockLock( gFd->lock );
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if( gFd->socketCount < getSocketMax( gFd ) )
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{
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len = sizeof( sock );
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s = accept( b, (struct sockaddr *) &sock, &len );
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}
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if( s > -1 )
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{
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*addr = sock.sin_addr;
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*port = sock.sin_port;
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++gFd->socketCount;
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}
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tr_lockUnlock( gFd->lock );
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return s;
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}
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static void
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socketClose( int fd )
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{
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#ifdef BEOS_NETSERVER
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closesocket( fd );
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#else
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EVUTIL_CLOSESOCKET( fd );
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#endif
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}
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void
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tr_fdSocketClose( int s )
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{
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tr_lockLock( gFd->lock );
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if( s >= 0 )
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{
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socketClose( s );
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--gFd->socketCount;
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}
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assert( gFd->socketCount >= 0 );
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tr_lockUnlock( gFd->lock );
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}
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/***
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****
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**** Startup / Shutdown
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****
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***/
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void
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tr_fdInit( int globalPeerLimit )
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{
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int i;
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assert( gFd == NULL );
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gFd = tr_new0( struct tr_fd_s, 1 );
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gFd->lock = tr_lockNew( );
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#ifdef HAVE_GETRLIMIT
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{
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struct rlimit rlim;
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getrlimit( RLIMIT_NOFILE, &rlim );
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rlim.rlim_cur = MIN( rlim.rlim_max,
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(rlim_t)( globalPeerLimit + NOFILE_BUFFER ) );
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setrlimit( RLIMIT_NOFILE, &rlim );
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gFd->socketMax = rlim.rlim_cur - NOFILE_BUFFER;
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tr_dbg( "setrlimit( RLIMIT_NOFILE, %d )", (int)rlim.rlim_cur );
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}
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#else
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gFd->socketMax = globalPeerLimit;
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#endif
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tr_dbg( "%d usable file descriptors", globalPeerLimit );
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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gFd->open[i].fd = -1;
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}
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void
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tr_fdClose( void )
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{
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int i = 0;
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for( i = 0; i < TR_MAX_OPEN_FILES; ++i )
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if( fileIsOpen( &gFd->open[i] ) )
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TrCloseFile( i );
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tr_lockFree( gFd->lock );
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tr_free( gFd );
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gFd = NULL;
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}
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void
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tr_fdSetPeerLimit( uint16_t n )
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{
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assert( gFd != NULL && "tr_fdInit() must be called first!" );
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gFd->socketMax = n;
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}
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uint16_t
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tr_fdGetPeerLimit( void )
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{
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return gFd ? gFd->socketMax : -1;
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}
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