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(libT) get file preallocation working on Windows by copying how fsutil does it. (source: http://social.msdn.microsoft.com/forums/en-US/vclanguage/thread/4dabec8e-2909-40b3-b398-66bd4c587b9b/)

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This commit is contained in:
Charles Kerr 2008-11-15 19:59:18 +00:00
parent 3548135711
commit 10714dc224
1 changed files with 54 additions and 22 deletions
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76
libtransmission/fdlimit.c
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@ -95,33 +95,65 @@ static struct tr_fd_s * gFd = NULL;
****
***/
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
static int
preallocateFile( int fd UNUSED, uint64_t length UNUSED )
preallocateFile( const char * filename, uint64_t length )
{
#ifdef HAVE_FALLOCATE
int success = 0;
return fallocate( fd, FALLOC_FL_KEEP_SIZE, 0, length );
#ifdef WIN32
#elif defined(HAVE_POSIX_FALLOCATE)
return posix_fallocate( fd, 0, length );
#elif defined(SYS_DARWIN)
fstore_t fst;
fst.fst_flags = F_ALLOCATECONTIG;
fst.fst_posmode = F_PEOFPOSMODE;
fst.fst_offset = 0;
fst.fst_length = length;
fst.fst_bytesalloc = 0;
return fcntl( fd, F_PREALLOCATE, &fst );
HANDLE hFile = CreateFile( filename, GENERIC_WRITE, 0, 0, CREATE_NEW, 0, 0 );
if( hFile != INVALID_HANDLE_VALUE )
{
LARGE_INTEGER li;
li.QuadPart = desiredFileSize;
success = SetFilePointerEx( hFile, desiredFileSize, NULL, FILE_BEGIN )
&& SetEndOfFile( hFile );
CloseHandle( hFile );
}
#else
#warning no known method to preallocate files on this platform
return -1;
int flags = O_RDWR | O_CREAT | O_LARGEFILE;
int fd = open( filename, flags, 0666 );
if( fd >= 0 )
{
# ifdef HAVE_FALLOCATE
success = !fallocate( fd, FALLOC_FL_KEEP_SIZE, 0, length );
# elif defined(HAVE_POSIX_FALLOCATE)
success = !posix_fallocate( fd, 0, length );
# elif defined(SYS_DARWIN)
fstore_t fst;
fst.fst_flags = F_ALLOCATECONTIG;
fst.fst_posmode = F_PEOFPOSMODE;
fst.fst_offset = 0;
fst.fst_length = length;
fst.fst_bytesalloc = 0;
success = !fcntl( fd, F_PREALLOCATE, &fst );
# else
#warning no known method to preallocate files on this platform
success = 0;
# endif
close( fd );
}
#endif
return success;
}
/**
@ -162,6 +194,10 @@ TrOpenFile( int i,
alreadyExisted = !stat( filename, &sb ) && S_ISREG( sb.st_mode );
if( doWrite && !alreadyExisted && doPreallocate )
if( preallocateFile( filename, desiredFileSize ) )
tr_inf( _( "Preallocated file \"%s\"" ), filename );
/* open the file */
flags = doWrite ? ( O_RDWR | O_CREAT ) : O_RDONLY;
#ifdef O_LARGEFILE
@ -180,10 +216,6 @@ TrOpenFile( int i,
return err;
}
if( ( file->fd >= 0 ) && !alreadyExisted && doPreallocate )
if( !preallocateFile( file->fd, desiredFileSize ) )
tr_inf( _( "Preallocated file \"%s\"" ), filename );
tr_free( filename );
return 0;
}