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filesystem: use sendfile for faster FS_FileCopy on Linux

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This commit is contained in:
Alibek Omarov
2026-05-27 00:34:43 +05:00
parent d44e6d5db7
commit 8ee3544507
1 changed files with 69 additions and 1 deletions
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70
filesystem/io.c
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@@ -24,6 +24,9 @@ GNU General Public License for more details.
#if XASH_WIN32
#include <io.h>
#endif
#if XASH_LINUX
#include <sys/sendfile.h>
#endif
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
@@ -1027,10 +1030,75 @@ FS_FileCopy
*/
qboolean FS_FileCopy( file_t *pOutput, file_t *pInput, int fileSize )
{
char *buf = Mem_Malloc( fs_mempool, FILE_COPY_SIZE );
char *buf;
int size, readSize;
qboolean done = true;
#if XASH_LINUX && !defined( XASH_REDUCE_FD )
// sendfile can't decompress, and we'd skip past userspace-buffered bytes
if( !FBitSet( pInput->flags, FILE_DEFLATED ) && pInput->ungetc == EOF && pInput->buff_ind == pInput->buff_len )
{
off_t out_pos;
// mirror FS_Write's pre-write fixup so the output fd offset matches file_t's position
if( pOutput->buff_ind != pOutput->buff_len )
lseek( pOutput->handle, pOutput->buff_ind - pOutput->buff_len, SEEK_CUR );
FS_Purge( pOutput );
off_t in_off = pInput->offset + pInput->position;
while( fileSize > 0 )
{
ssize_t sent = sendfile( pOutput->handle, pInput->handle, &in_off, fileSize );
if( sent < 0 )
{
if( errno == EINTR )
continue;
// some kernels/filesystems don't support sendfile between these fds
if( errno == EINVAL || errno == ENOSYS || errno == EOPNOTSUPP )
break;
Con_Reportf( S_ERROR "%s: sendfile failed: %s\n", __func__, strerror( errno ));
done = false;
fileSize = 0;
break;
}
if( sent == 0 )
{
Con_Reportf( S_ERROR "%s: unexpected end of input file\n", __func__ );
done = false;
fileSize = 0;
break;
}
fileSize -= sent;
}
pInput->position = in_off - pInput->offset;
out_pos = lseek( pOutput->handle, 0, SEEK_CUR );
if( out_pos < 0 )
{
Con_Reportf( S_ERROR "%s: lseek failed: %s\n", __func__, strerror( errno ));
done = false;
fileSize = 0;
}
else
{
pOutput->position = out_pos;
if( pOutput->real_length < pOutput->position )
pOutput->real_length = pOutput->position;
}
if( fileSize <= 0 )
return done;
}
#endif
buf = Mem_Malloc( fs_mempool, FILE_COPY_SIZE );
while( fileSize > 0 )
{
if( fileSize > FILE_COPY_SIZE )