source3/smbd/oplock_irix.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    IRIX kernel oplock processing
   4    Copyright (C) Andrew Tridgell 1992-1998
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include "includes.h"
  22
  23 #if HAVE_KERNEL_OPLOCKS_IRIX
  24
  25 static int oplock_pipe_write = -1;
  26 static int oplock_pipe_read = -1;
  27
  28 /****************************************************************************
  29  Test to see if IRIX kernel oplocks work.
  30 ****************************************************************************/
  31
  32 static BOOL irix_oplocks_available(void)
  33 {
  34         int fd;
  35         int pfd[2];
  36         pstring tmpname;
  37
  38         oplock_set_capability(True, False);
  39
  40         slprintf(tmpname,sizeof(tmpname)-1, "%s/koplock.%d", lp_lockdir(), (int)sys_getpid());
  41
  42         if(pipe(pfd) != 0) {
  43                 DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error was %s\n",
  44                          strerror(errno) ));
  45                 return False;
  46         }
  47
  48         if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
  49                 DEBUG(0,("check_kernel_oplocks: Unable to open temp test file %s. Error was %s\n",
  50                          tmpname, strerror(errno) ));
  51                 unlink( tmpname );
  52                 close(pfd[0]);
  53                 close(pfd[1]);
  54                 return False;
  55         }
  56
  57         unlink(tmpname);
  58
  59         if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
  60                 DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not available on this machine. \
  61 Disabling kernel oplock support.\n" ));
  62                 close(pfd[0]);
  63                 close(pfd[1]);
  64                 close(fd);
  65                 return False;
  66         }
  67
  68         if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
  69                 DEBUG(0,("check_kernel_oplocks: Error when removing kernel oplock. Error was %s. \
  70 Disabling kernel oplock support.\n", strerror(errno) ));
  71                 close(pfd[0]);
  72                 close(pfd[1]);
  73                 close(fd);
  74                 return False;
  75         }
  76
  77         close(pfd[0]);
  78         close(pfd[1]);
  79         close(fd);
  80
  81         return True;
  82 }
  83
  84 /****************************************************************************
  85  * Deal with the IRIX kernel <--> smbd
  86  * oplock break protocol.
  87 ****************************************************************************/
  88
  89 static files_struct *irix_oplock_receive_message(fd_set *fds)
  90 {
  91         extern int smb_read_error;
  92         oplock_stat_t os;
  93         char dummy;
  94         files_struct *fsp;
  95
  96         /*
  97          * Read one byte of zero to clear the
  98          * kernel break notify message.
  99          */
 100
 101         if(read(oplock_pipe_read, &dummy, 1) != 1) {
 102                 DEBUG(0,("irix_oplock_receive_message: read of kernel "
 103                          "notification failed. Error was %s.\n",
 104                          strerror(errno) ));
 105                 smb_read_error = READ_ERROR;
 106                 return NULL;
 107         }
 108
 109         /*
 110          * Do a query to get the
 111          * device and inode of the file that has the break
 112          * request outstanding.
 113          */
 114
 115         if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
 116                 DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
 117                          "notification failed. Error was %s.\n",
 118                          strerror(errno) ));
 119                 if(errno == EAGAIN) {
 120                         /*
 121                          * Duplicate kernel break message - ignore.
 122                          */
 123                         return NULL;
 124                 }
 125                 smb_read_error = READ_ERROR;
 126                 return NULL;
 127         }
 128
 129         /*
 130          * We only have device and inode info here - we have to guess that this
 131          * is the first fsp open with this dev,ino pair.
 132          */
 133
 134         if ((fsp = file_find_di_first((SMB_DEV_T)os.os_dev,
 135                                       (SMB_INO_T)os.os_ino)) == NULL) {
 136                 DEBUG(0,("irix_oplock_receive_message: unable to find open "
 137                          "file with dev = %x, inode = %.0f\n",
 138                          (unsigned int)os.os_dev, (double)os.os_ino ));
 139                 return NULL;
 140         }
 141
 142         DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
 143                  "received for dev = %x, inode = %.0f\n, file_id = %ul",
 144                  (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id ));
 145
 146         return fsp;
 147 }
 148
 149 /****************************************************************************
 150  Attempt to set an kernel oplock on a file.
 151 ****************************************************************************/
 152
 153 static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
 154 {
 155         if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
 156                 if(errno != EAGAIN) {
 157                         DEBUG(0,("irix_set_kernel_oplock: Unable to get kernel oplock on file %s, dev = %x, \
 158 inode = %.0f, file_id = %ul. Error was %s\n",
 159                                  fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id,
 160                                  strerror(errno) ));
 161                 } else {
 162                         DEBUG(5,("irix_set_kernel_oplock: Refused oplock on file %s, fd = %d, dev = %x, \
 163 inode = %.0f, file_id = %ul. Another process had the file open.\n",
 164                                  fsp->fsp_name, fsp->fh->fd, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id ));
 165                 }
 166                 return False;
 167         }
 168
 169         DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, dev = %x, inode = %.0f, file_id = %ul\n",
 170                   fsp->fsp_name, (unsigned int)fsp->dev, (double)fsp->inode, fsp->file_id));
 171
 172         return True;
 173 }
 174
 175 /****************************************************************************
 176  Release a kernel oplock on a file.
 177 ****************************************************************************/
 178
 179 static void irix_release_kernel_oplock(files_struct *fsp)
 180 {
 181         if (DEBUGLVL(10)) {
 182                 /*
 183                  * Check and print out the current kernel
 184                  * oplock state of this file.
 185                  */
 186                 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
 187                 dbgtext("irix_release_kernel_oplock: file %s, dev = %x, inode = %.0f file_id = %ul, has kernel \
 188 oplock state of %x.\n", fsp->fsp_name, (unsigned int)fsp->dev,
 189                         (double)fsp->inode, fsp->file_id, state );
 190         }
 191
 192         /*
 193          * Remove the kernel oplock on this file.
 194          */
 195         if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
 196                 if( DEBUGLVL( 0 )) {
 197                         dbgtext("irix_release_kernel_oplock: Error when removing kernel oplock on file " );
 198                         dbgtext("%s, dev = %x, inode = %.0f, file_id = %ul. Error was %s\n",
 199                                 fsp->fsp_name, (unsigned int)fsp->dev,
 200                                 (double)fsp->inode, fsp->file_id, strerror(errno) );
 201                 }
 202         }
 203 }
 204
 205 /****************************************************************************
 206  Set *maxfd to include oplock read pipe.
 207 ****************************************************************************/
 208
 209 static BOOL irix_oplock_msg_waiting(fd_set *fds)
 210 {
 211         if (oplock_pipe_read == -1)
 212                 return False;
 213
 214         return FD_ISSET(oplock_pipe_read,fds);
 215 }
 216
 217 /****************************************************************************
 218  Setup kernel oplocks.
 219 ****************************************************************************/
 220
 221 struct kernel_oplocks *irix_init_kernel_oplocks(void)
 222 {
 223         int pfd[2];
 224         static struct kernel_oplocks koplocks;
 225
 226         if (!irix_oplocks_available())
 227                 return NULL;
 228
 229         if(pipe(pfd) != 0) {
 230                 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. Error was %s\n",
 231                          strerror(errno) ));
 232                 return False;
 233         }
 234
 235         oplock_pipe_read = pfd[0];
 236         oplock_pipe_write = pfd[1];
 237
 238         koplocks.receive_message = irix_oplock_receive_message;
 239         koplocks.set_oplock = irix_set_kernel_oplock;
 240         koplocks.release_oplock = irix_release_kernel_oplock;
 241         koplocks.msg_waiting = irix_oplock_msg_waiting;
 242         koplocks.notification_fd = oplock_pipe_read;
 243
 244         return &koplocks;
 245 }
 246 #else
 247  void oplock_irix_dummy(void) {}
 248 #endif /* HAVE_KERNEL_OPLOCKS_IRIX */