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;
99 struct file_id fileid;
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.
142 * NOTE: this doesn't work if any VFS modules overloads
143 * the file_id_create() hook!
146 fileid = file_id_create_dev((SMB_DEV_T)os.os_dev,
147 (SMB_INO_T)os.os_ino);
148 if ((fsp = file_find_di_first(fileid)) == NULL) {
149 DEBUG(0,("irix_oplock_receive_message: unable to find open "
150 "file with dev = %x, inode = %.0f\n",
151 (unsigned int)os.os_dev, (double)os.os_ino ));
155 DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
156 "received for file_id %s gen_id = %ul",
157 file_id_string_tos(&fsp->file_id),
163 /****************************************************************************
164 Attempt to set an kernel oplock on a file.
165 ****************************************************************************/
167 static BOOL irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
169 if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
170 if(errno != EAGAIN) {
171 DEBUG(0,("irix_set_kernel_oplock: Unable to get "
172 "kernel oplock on file %s, file_id %s "
173 "gen_id = %ul. Error was %s\n",
174 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
178 DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
179 "file %s, fd = %d, file_id = 5s, "
180 "gen_id = %ul. Another process had the file "
182 fsp->fsp_name, fsp->fh->fd,
183 file_id_string_tos(&fsp->file_id),
189 DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
191 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
197 /****************************************************************************
198 Release a kernel oplock on a file.
199 ****************************************************************************/
201 static void irix_release_kernel_oplock(files_struct *fsp)
205 * Check and print out the current kernel
206 * oplock state of this file.
208 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
209 dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
210 "gen_id = %ul, has kernel oplock state "
211 "of %x.\n", fsp->fsp_name, file_id_string_tos(&fsp->file_id),
212 fsp->fh->gen_id, state );
216 * Remove the kernel oplock on this file.
218 if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
220 dbgtext("irix_release_kernel_oplock: Error when "
221 "removing kernel oplock on file " );
222 dbgtext("%s, file_id = %s gen_id = %ul. "
224 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
231 /****************************************************************************
232 See if there is a message waiting in this fd set.
233 Note that fds MAY BE NULL ! If so we must do our own select.
234 ****************************************************************************/
236 static BOOL irix_oplock_msg_waiting(fd_set *fds)
242 if (oplock_pipe_read == -1)
246 return FD_ISSET(oplock_pipe_read, fds);
249 /* Do a zero-time select. We just need to find out if there
250 * are any outstanding messages. We use sys_select_intr as
251 * we need to ignore any signals. */
254 FD_SET(oplock_pipe_read, &myfds);
256 to = timeval_set(0, 0);
257 selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
258 return (selrtn == 1) ? True : False;
261 /****************************************************************************
262 Setup kernel oplocks.
263 ****************************************************************************/
265 struct kernel_oplocks *irix_init_kernel_oplocks(void)
268 static struct kernel_oplocks koplocks;
270 if (!irix_oplocks_available())
274 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
275 "Error was %s\n", strerror(errno) ));
279 oplock_pipe_read = pfd[0];
280 oplock_pipe_write = pfd[1];
282 koplocks.receive_message = irix_oplock_receive_message;
283 koplocks.set_oplock = irix_set_kernel_oplock;
284 koplocks.release_oplock = irix_release_kernel_oplock;
285 koplocks.msg_waiting = irix_oplock_msg_waiting;
286 koplocks.notification_fd = oplock_pipe_read;
291 void oplock_irix_dummy(void);
292 void oplock_irix_dummy(void) {}
293 #endif /* HAVE_KERNEL_OPLOCKS_IRIX */