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Diffstat (limited to 'source3/smbd/predict.c')
| -rw-r--r-- | source3/smbd/predict.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/source3/smbd/predict.c b/source3/smbd/predict.c deleted file mode 100644 index 34044b82f2..0000000000 --- a/source3/smbd/predict.c +++ /dev/null @@ -1,162 +0,0 @@ -/* - Unix SMB/Netbios implementation. - Version 1.9. - file read prediction routines - Copyright (C) Andrew Tridgell 1992-1998 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include "includes.h" - -extern int DEBUGLEVEL; - -#if USE_READ_PREDICTION - -/* variables used by the read prediction module */ -static int rp_fd = -1; -static SMB_OFF_T rp_offset = 0; -static ssize_t rp_length = 0; -static ssize_t rp_alloced = 0; -static int rp_predict_fd = -1; -static SMB_OFF_T rp_predict_offset = 0; -static size_t rp_predict_length = 0; -static int rp_timeout = 5; -static time_t rp_time = 0; -static char *rp_buffer = NULL; -static BOOL predict_skip=False; -extern struct timeval smb_last_time; - -/**************************************************************************** -handle read prediction on a file -****************************************************************************/ -ssize_t read_predict(files_struct *fsp, int fd,SMB_OFF_T offset,char *buf,char **ptr,size_t num) -{ - ssize_t ret = 0; - ssize_t possible = rp_length - (offset - rp_offset); - - possible = MIN(possible,num); - - /* give data if possible */ - if (fd == rp_fd && - offset >= rp_offset && - possible>0 && - smb_last_time.tv_secs - rp_time < rp_timeout) - { - ret = possible; - if (buf) - memcpy(buf,rp_buffer + (offset-rp_offset),possible); - else - *ptr = rp_buffer + (offset-rp_offset); - DEBUG(5,("read-prediction gave %d bytes of %d\n",ret,num)); - } - - if (ret == num) { - predict_skip = True; - } else { - SMB_STRUCT_STAT rp_stat; - - /* Find the end of the file - ensure we don't - read predict beyond it. */ - if(fsp->conn->vfs_ops.fstat(fd,&rp_stat) < 0) - { - DEBUG(0,("read-prediction failed on fstat. Error was %s\n", strerror(errno))); - predict_skip = True; - } - else - { - predict_skip = False; - - /* prepare the next prediction */ - rp_predict_fd = fd; - /* Make sure we don't seek beyond the end of the file. */ - rp_predict_offset = MIN((offset + num),rp_stat.st_size); - rp_predict_length = num; - } - } - - if (ret < 0) ret = 0; - - return(ret); -} - -/**************************************************************************** -pre-read some data -****************************************************************************/ -void do_read_prediction(connection_struct *conn) -{ - static size_t readsize = 0; - - if (predict_skip) return; - - if (rp_predict_fd == -1) - return; - - rp_fd = rp_predict_fd; - rp_offset = rp_predict_offset; - rp_length = 0; - - rp_predict_fd = -1; - - if (readsize == 0) { - readsize = lp_readsize(); - readsize = MAX(readsize,1024); - } - - rp_predict_length = MIN(rp_predict_length,2*readsize); - rp_predict_length = MAX(rp_predict_length,1024); - rp_offset = (rp_offset/1024)*1024; - rp_predict_length = (rp_predict_length/1024)*1024; - - if (rp_predict_length > rp_alloced) - { - rp_buffer = Realloc(rp_buffer,rp_predict_length); - rp_alloced = rp_predict_length; - if (!rp_buffer) - { - DEBUG(0,("can't allocate read-prediction buffer\n")); - rp_predict_fd = -1; - rp_fd = -1; - rp_alloced = 0; - return; - } - } - - if (conn->vfs_ops.lseek(rp_fd,rp_offset,SEEK_SET) != rp_offset) { - rp_fd = -1; - rp_predict_fd = -1; - return; - } - - rp_length = conn->vfs_ops.read(rp_fd,rp_buffer,rp_predict_length); - rp_time = time(NULL); - if (rp_length < 0) - rp_length = 0; -} - -/**************************************************************************** -invalidate read-prediction on a fd -****************************************************************************/ -void invalidate_read_prediction(int fd) -{ - if (rp_fd == fd) - rp_fd = -1; - if (rp_predict_fd == fd) - rp_predict_fd = -1; -} - -#else - void read_prediction_dummy(void) ; -#endif |