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 3 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, see <http://www.gnu.org/licenses/>.
20 #define DBGC_CLASS DBGC_LOCKING
23 #if HAVE_KERNEL_OPLOCKS_IRIX
25 static int oplock_pipe_write = -1;
26 static int oplock_pipe_read = -1;
28 /****************************************************************************
29 Test to see if IRIX kernel oplocks work.
30 ****************************************************************************/
32 static BOOL irix_oplocks_available(void)
38 set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
40 slprintf(tmpname,sizeof(tmpname)-1, "%s/koplock.%d", lp_lockdir(),
44 DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
50 if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
51 DEBUG(0,("check_kernel_oplocks: Unable to open temp test file "
53 tmpname, strerror(errno) ));
62 if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
63 DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not "
64 "available on this machine. Disabling kernel oplock "
72 if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
73 DEBUG(0,("check_kernel_oplocks: Error when removing kernel "
74 "oplock. Error was %s. Disabling kernel oplock "
75 "support.\n", strerror(errno) ));
89 /****************************************************************************
90 * Deal with the IRIX kernel <--> smbd
91 * oplock break protocol.
92 ****************************************************************************/
94 static files_struct *irix_oplock_receive_message(fd_set *fds)
96 extern int smb_read_error;
101 /* Ensure we only get one call per select fd set. */
102 FD_CLR(oplock_pipe_read, fds);
105 * Read one byte of zero to clear the
106 * kernel break notify message.
109 if(read(oplock_pipe_read, &dummy, 1) != 1) {
110 DEBUG(0,("irix_oplock_receive_message: read of kernel "
111 "notification failed. Error was %s.\n",
113 smb_read_error = READ_ERROR;
118 * Do a query to get the
119 * device and inode of the file that has the break
120 * request outstanding.
123 if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
124 DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
125 "notification failed. Error was %s.\n",
127 if(errno == EAGAIN) {
129 * Duplicate kernel break message - ignore.
133 smb_read_error = READ_ERROR;
138 * We only have device and inode info here - we have to guess that this
139 * is the first fsp open with this dev,ino pair.
142 if ((fsp = file_find_di_first(
143 file_id_create((SMB_DEV_T)os.os_dev,
144 (SMB_INO_T)os.os_ino))) == NULL) {
145 DEBUG(0,("irix_oplock_receive_message: unable to find open "
146 "file with dev = %x, inode = %.0f\n",
147 (unsigned int)os.os_dev, (double)os.os_ino ));
151 DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
152 "received for file_id %s gen_id = %ul",
153 file_id_static_string(&fsp->file_id),
159 /****************************************************************************
160 Attempt to set an kernel oplock on a file.
161 ****************************************************************************/
163 static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
165 if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
166 if(errno != EAGAIN) {
167 DEBUG(0,("irix_set_kernel_oplock: Unable to get "
168 "kernel oplock on file %s, file_id %s "
169 "gen_id = %ul. Error was %s\n",
170 fsp->fsp_name, file_id_static_string(&fsp->file_id),
174 DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
175 "file %s, fd = %d, file_id = 5s, "
176 "gen_id = %ul. Another process had the file "
178 fsp->fsp_name, fsp->fh->fd,
179 file_id_static_string(&fsp->file_id),
185 DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
187 fsp->fsp_name, file_id_static_string(&fsp->file_id),
193 /****************************************************************************
194 Release a kernel oplock on a file.
195 ****************************************************************************/
197 static void irix_release_kernel_oplock(files_struct *fsp)
201 * Check and print out the current kernel
202 * oplock state of this file.
204 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
205 dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
206 "gen_id = %ul, has kernel oplock state "
207 "of %x.\n", fsp->fsp_name, file_id_static_string(&fsp->file_id),
208 fsp->fh->gen_id, state );
212 * Remove the kernel oplock on this file.
214 if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
216 dbgtext("irix_release_kernel_oplock: Error when "
217 "removing kernel oplock on file " );
218 dbgtext("%s, file_id = %s gen_id = %ul. "
220 fsp->fsp_name, file_id_static_string(&fsp->file_id),
227 /****************************************************************************
228 See if there is a message waiting in this fd set.
229 Note that fds MAY BE NULL ! If so we must do our own select.
230 ****************************************************************************/
232 static BOOL irix_oplock_msg_waiting(fd_set *fds)
238 if (oplock_pipe_read == -1)
242 return FD_ISSET(oplock_pipe_read, fds);
245 /* Do a zero-time select. We just need to find out if there
246 * are any outstanding messages. We use sys_select_intr as
247 * we need to ignore any signals. */
250 FD_SET(oplock_pipe_read, &myfds);
252 to = timeval_set(0, 0);
253 selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
254 return (selrtn == 1) ? True : False;
257 /****************************************************************************
258 Setup kernel oplocks.
259 ****************************************************************************/
261 struct kernel_oplocks *irix_init_kernel_oplocks(void)
264 static struct kernel_oplocks koplocks;
266 if (!irix_oplocks_available())
270 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
271 "Error was %s\n", strerror(errno) ));
275 oplock_pipe_read = pfd[0];
276 oplock_pipe_write = pfd[1];
278 koplocks.receive_message = irix_oplock_receive_message;
279 koplocks.set_oplock = irix_set_kernel_oplock;
280 koplocks.release_oplock = irix_release_kernel_oplock;
281 koplocks.msg_waiting = irix_oplock_msg_waiting;
282 koplocks.notification_fd = oplock_pipe_read;
287 void oplock_irix_dummy(void);
288 void oplock_irix_dummy(void) {}
289 #endif /* HAVE_KERNEL_OPLOCKS_IRIX */