2 Unix SMB/CIFS implementation.
3 IRIX kernel oplock processing
4 Copyright (C) Andrew Tridgell 1992-1998
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.
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.
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.
21 #define DBGC_CLASS DBGC_LOCKING
24 #if HAVE_KERNEL_OPLOCKS_IRIX
26 static int oplock_pipe_write = -1;
27 static int oplock_pipe_read = -1;
29 /****************************************************************************
30 Test to see if IRIX kernel oplocks work.
31 ****************************************************************************/
33 static BOOL irix_oplocks_available(void)
39 set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
41 slprintf(tmpname,sizeof(tmpname)-1, "%s/koplock.%d", lp_lockdir(),
45 DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
51 if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
52 DEBUG(0,("check_kernel_oplocks: Unable to open temp test file "
54 tmpname, strerror(errno) ));
63 if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
64 DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not "
65 "available on this machine. Disabling kernel oplock "
73 if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
74 DEBUG(0,("check_kernel_oplocks: Error when removing kernel "
75 "oplock. Error was %s. Disabling kernel oplock "
76 "support.\n", strerror(errno) ));
90 /****************************************************************************
91 * Deal with the IRIX kernel <--> smbd
92 * oplock break protocol.
93 ****************************************************************************/
95 static files_struct *irix_oplock_receive_message(fd_set *fds)
97 extern int smb_read_error;
102 /* Ensure we only get one call per select fd set. */
103 FD_CLR(oplock_pipe_read, fds);
106 * Read one byte of zero to clear the
107 * kernel break notify message.
110 if(read(oplock_pipe_read, &dummy, 1) != 1) {
111 DEBUG(0,("irix_oplock_receive_message: read of kernel "
112 "notification failed. Error was %s.\n",
114 smb_read_error = READ_ERROR;
119 * Do a query to get the
120 * device and inode of the file that has the break
121 * request outstanding.
124 if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
125 DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
126 "notification failed. Error was %s.\n",
128 if(errno == EAGAIN) {
130 * Duplicate kernel break message - ignore.
134 smb_read_error = READ_ERROR;
139 * We only have device and inode info here - we have to guess that this
140 * is the first fsp open with this dev,ino pair.
143 if ((fsp = file_find_di_first(
144 file_id_create((SMB_DEV_T)os.os_dev,
145 (SMB_INO_T)os.os_ino))) == NULL) {
146 DEBUG(0,("irix_oplock_receive_message: unable to find open "
147 "file with dev = %x, inode = %.0f\n",
148 (unsigned int)os.os_dev, (double)os.os_ino ));
152 DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
153 "received for file_id %s gen_id = %ul",
154 file_id_static_string(&fsp->file_id),
160 /****************************************************************************
161 Attempt to set an kernel oplock on a file.
162 ****************************************************************************/
164 static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
166 if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
167 if(errno != EAGAIN) {
168 DEBUG(0,("irix_set_kernel_oplock: Unable to get "
169 "kernel oplock on file %s, file_id %s "
170 "gen_id = %ul. Error was %s\n",
171 fsp->fsp_name, file_id_static_string(&fsp->file_id),
175 DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
176 "file %s, fd = %d, file_id = 5s, "
177 "gen_id = %ul. Another process had the file "
179 fsp->fsp_name, fsp->fh->fd,
180 file_id_static_string(&fsp->file_id),
186 DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
188 fsp->fsp_name, file_id_static_string(&fsp->file_id),
194 /****************************************************************************
195 Release a kernel oplock on a file.
196 ****************************************************************************/
198 static void irix_release_kernel_oplock(files_struct *fsp)
202 * Check and print out the current kernel
203 * oplock state of this file.
205 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
206 dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
207 "gen_id = %ul, has kernel oplock state "
208 "of %x.\n", fsp->fsp_name, file_id_static_string(&fsp->file_id),
209 fsp->fh->gen_id, state );
213 * Remove the kernel oplock on this file.
215 if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
217 dbgtext("irix_release_kernel_oplock: Error when "
218 "removing kernel oplock on file " );
219 dbgtext("%s, file_id = %s gen_id = %ul. "
221 fsp->fsp_name, file_id_static_string(&fsp->file_id),
228 /****************************************************************************
229 See if there is a message waiting in this fd set.
230 Note that fds MAY BE NULL ! If so we must do our own select.
231 ****************************************************************************/
233 static BOOL irix_oplock_msg_waiting(fd_set *fds)
239 if (oplock_pipe_read == -1)
243 return FD_ISSET(oplock_pipe_read, fds);
246 /* Do a zero-time select. We just need to find out if there
247 * are any outstanding messages. We use sys_select_intr as
248 * we need to ignore any signals. */
251 FD_SET(oplock_pipe_read, &myfds);
253 to = timeval_set(0, 0);
254 selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
255 return (selrtn == 1) ? True : False;
258 /****************************************************************************
259 Setup kernel oplocks.
260 ****************************************************************************/
262 struct kernel_oplocks *irix_init_kernel_oplocks(void)
265 static struct kernel_oplocks koplocks;
267 if (!irix_oplocks_available())
271 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
272 "Error was %s\n", strerror(errno) ));
276 oplock_pipe_read = pfd[0];
277 oplock_pipe_write = pfd[1];
279 koplocks.receive_message = irix_oplock_receive_message;
280 koplocks.set_oplock = irix_set_kernel_oplock;
281 koplocks.release_oplock = irix_release_kernel_oplock;
282 koplocks.msg_waiting = irix_oplock_msg_waiting;
283 koplocks.notification_fd = oplock_pipe_read;
288 void oplock_irix_dummy(void);
289 void oplock_irix_dummy(void) {}
290 #endif /* HAVE_KERNEL_OPLOCKS_IRIX */