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)
36 TALLOC_CTX *ctx = talloc_stackframe();
39 set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
41 tmpname = talloc_asprintf(ctx,
51 DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
58 if((fd = sys_open(tmpname, O_RDWR|O_CREAT|O_EXCL|O_TRUNC, 0600)) < 0) {
59 DEBUG(0,("check_kernel_oplocks: Unable to open temp test file "
61 tmpname, strerror(errno) ));
73 if(sys_fcntl_long(fd, F_OPLKREG, pfd[1]) == -1) {
74 DEBUG(0,("check_kernel_oplocks: Kernel oplocks are not "
75 "available on this machine. Disabling kernel oplock "
83 if(sys_fcntl_long(fd, F_OPLKACK, OP_REVOKE) < 0 ) {
84 DEBUG(0,("check_kernel_oplocks: Error when removing kernel "
85 "oplock. Error was %s. Disabling kernel oplock "
86 "support.\n", strerror(errno) ));
100 /****************************************************************************
101 * Deal with the IRIX kernel <--> smbd
102 * oplock break protocol.
103 ****************************************************************************/
105 static files_struct *irix_oplock_receive_message(fd_set *fds)
107 extern int smb_read_error;
110 struct file_id fileid;
113 /* Ensure we only get one call per select fd set. */
114 FD_CLR(oplock_pipe_read, fds);
117 * Read one byte of zero to clear the
118 * kernel break notify message.
121 if(read(oplock_pipe_read, &dummy, 1) != 1) {
122 DEBUG(0,("irix_oplock_receive_message: read of kernel "
123 "notification failed. Error was %s.\n",
125 smb_read_error = READ_ERROR;
130 * Do a query to get the
131 * device and inode of the file that has the break
132 * request outstanding.
135 if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
136 DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
137 "notification failed. Error was %s.\n",
139 if(errno == EAGAIN) {
141 * Duplicate kernel break message - ignore.
145 smb_read_error = READ_ERROR;
150 * We only have device and inode info here - we have to guess that this
151 * is the first fsp open with this dev,ino pair.
153 * NOTE: this doesn't work if any VFS modules overloads
154 * the file_id_create() hook!
157 fileid = file_id_create_dev((SMB_DEV_T)os.os_dev,
158 (SMB_INO_T)os.os_ino);
159 if ((fsp = file_find_di_first(fileid)) == NULL) {
160 DEBUG(0,("irix_oplock_receive_message: unable to find open "
161 "file with dev = %x, inode = %.0f\n",
162 (unsigned int)os.os_dev, (double)os.os_ino ));
166 DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
167 "received for file_id %s gen_id = %ul",
168 file_id_string_tos(&fsp->file_id),
174 /****************************************************************************
175 Attempt to set an kernel oplock on a file.
176 ****************************************************************************/
178 static bool irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
180 if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
181 if(errno != EAGAIN) {
182 DEBUG(0,("irix_set_kernel_oplock: Unable to get "
183 "kernel oplock on file %s, file_id %s "
184 "gen_id = %ul. Error was %s\n",
185 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
189 DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
190 "file %s, fd = %d, file_id = 5s, "
191 "gen_id = %ul. Another process had the file "
193 fsp->fsp_name, fsp->fh->fd,
194 file_id_string_tos(&fsp->file_id),
200 DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
202 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
208 /****************************************************************************
209 Release a kernel oplock on a file.
210 ****************************************************************************/
212 static void irix_release_kernel_oplock(files_struct *fsp)
216 * Check and print out the current kernel
217 * oplock state of this file.
219 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
220 dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
221 "gen_id = %ul, has kernel oplock state "
222 "of %x.\n", fsp->fsp_name, file_id_string_tos(&fsp->file_id),
223 fsp->fh->gen_id, state );
227 * Remove the kernel oplock on this file.
229 if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
231 dbgtext("irix_release_kernel_oplock: Error when "
232 "removing kernel oplock on file " );
233 dbgtext("%s, file_id = %s gen_id = %ul. "
235 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
242 /****************************************************************************
243 See if there is a message waiting in this fd set.
244 Note that fds MAY BE NULL ! If so we must do our own select.
245 ****************************************************************************/
247 static bool irix_oplock_msg_waiting(fd_set *fds)
253 if (oplock_pipe_read == -1)
257 return FD_ISSET(oplock_pipe_read, fds);
260 /* Do a zero-time select. We just need to find out if there
261 * are any outstanding messages. We use sys_select_intr as
262 * we need to ignore any signals. */
265 FD_SET(oplock_pipe_read, &myfds);
267 to = timeval_set(0, 0);
268 selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
269 return (selrtn == 1) ? True : False;
272 /****************************************************************************
273 Setup kernel oplocks.
274 ****************************************************************************/
276 struct kernel_oplocks *irix_init_kernel_oplocks(void)
279 static struct kernel_oplocks koplocks;
281 if (!irix_oplocks_available())
285 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
286 "Error was %s\n", strerror(errno) ));
290 oplock_pipe_read = pfd[0];
291 oplock_pipe_write = pfd[1];
293 koplocks.receive_message = irix_oplock_receive_message;
294 koplocks.set_oplock = irix_set_kernel_oplock;
295 koplocks.release_oplock = irix_release_kernel_oplock;
296 koplocks.msg_waiting = irix_oplock_msg_waiting;
297 koplocks.notification_fd = oplock_pipe_read;
302 void oplock_irix_dummy(void);
303 void oplock_irix_dummy(void) {}
304 #endif /* HAVE_KERNEL_OPLOCKS_IRIX */