source: branches/samba-3.2.x/source/smbd/oplock_irix.c@ 579

Last change on this file since 579 was 141, checked in by Paul Smedley, 17 years ago

Update trunk to 3.2.1
File size: 8.4 KB
Line 
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 3 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, see <http://www.gnu.org/licenses/>.
18*/
19
20#define DBGC_CLASS DBGC_LOCKING
21#include "includes.h"
22
23#if HAVE_KERNEL_OPLOCKS_IRIX
24
25static int oplock_pipe_write = -1;
26static int oplock_pipe_read = -1;
27
28/****************************************************************************
29 Test to see if IRIX kernel oplocks work.
30****************************************************************************/
31
32static bool irix_oplocks_available(void)
33{
34 int fd;
35 int pfd[2];
36 TALLOC_CTX *ctx = talloc_stackframe();
37 char *tmpname = NULL;
38
39 set_effective_capability(KERNEL_OPLOCK_CAPABILITY);
40
41 tmpname = talloc_asprintf(ctx,
42 "%s/koplock.%d",
43 lp_lockdir(),
44 (int)sys_getpid());
45 if (!tmpname) {
46 TALLOC_FREE(ctx);
47 return False;
48 }
49
50 if(pipe(pfd) != 0) {
51 DEBUG(0,("check_kernel_oplocks: Unable to create pipe. Error "
52 "was %s\n",
53 strerror(errno) ));
54 TALLOC_FREE(ctx);
55 return False;
56 }
57
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 "
60 "%s. Error was %s\n",
61 tmpname, strerror(errno) ));
62 unlink( tmpname );
63 close(pfd[0]);
64 close(pfd[1]);
65 TALLOC_FREE(ctx);
66 return False;
67 }
68
69 unlink(tmpname);
70
71 TALLOC_FREE(ctx);
72
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 "
76 "support.\n" ));
77 close(pfd[0]);
78 close(pfd[1]);
79 close(fd);
80 return False;
81 }
82
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) ));
87 close(pfd[0]);
88 close(pfd[1]);
89 close(fd);
90 return False;
91 }
92
93 close(pfd[0]);
94 close(pfd[1]);
95 close(fd);
96
97 return True;
98}
99
100/****************************************************************************
101 * Deal with the IRIX kernel <--> smbd
102 * oplock break protocol.
103****************************************************************************/
104
105static files_struct *irix_oplock_receive_message(fd_set *fds)
106{
107 oplock_stat_t os;
108 char dummy;
109 struct file_id fileid;
110 files_struct *fsp;
111
112 /* Ensure we only get one call per select fd set. */
113 FD_CLR(oplock_pipe_read, fds);
114
115 /*
116 * Read one byte of zero to clear the
117 * kernel break notify message.
118 */
119
120 if(read(oplock_pipe_read, &dummy, 1) != 1) {
121 DEBUG(0,("irix_oplock_receive_message: read of kernel "
122 "notification failed. Error was %s.\n",
123 strerror(errno) ));
124 return NULL;
125 }
126
127 /*
128 * Do a query to get the
129 * device and inode of the file that has the break
130 * request outstanding.
131 */
132
133 if(sys_fcntl_ptr(oplock_pipe_read, F_OPLKSTAT, &os) < 0) {
134 DEBUG(0,("irix_oplock_receive_message: fcntl of kernel "
135 "notification failed. Error was %s.\n",
136 strerror(errno) ));
137 if(errno == EAGAIN) {
138 /*
139 * Duplicate kernel break message - ignore.
140 */
141 return NULL;
142 }
143 return NULL;
144 }
145
146 /*
147 * We only have device and inode info here - we have to guess that this
148 * is the first fsp open with this dev,ino pair.
149 *
150 * NOTE: this doesn't work if any VFS modules overloads
151 * the file_id_create() hook!
152 */
153
154 fileid = file_id_create_dev((SMB_DEV_T)os.os_dev,
155 (SMB_INO_T)os.os_ino);
156 if ((fsp = file_find_di_first(fileid)) == NULL) {
157 DEBUG(0,("irix_oplock_receive_message: unable to find open "
158 "file with dev = %x, inode = %.0f\n",
159 (unsigned int)os.os_dev, (double)os.os_ino ));
160 return NULL;
161 }
162
163 DEBUG(5,("irix_oplock_receive_message: kernel oplock break request "
164 "received for file_id %s gen_id = %ul",
165 file_id_string_tos(&fsp->file_id),
166 fsp->fh->gen_id ));
167
168 return fsp;
169}
170
171/****************************************************************************
172 Attempt to set an kernel oplock on a file.
173****************************************************************************/
174
175static bool irix_set_kernel_oplock(files_struct *fsp, int oplock_type)
176{
177 if (sys_fcntl_long(fsp->fh->fd, F_OPLKREG, oplock_pipe_write) == -1) {
178 if(errno != EAGAIN) {
179 DEBUG(0,("irix_set_kernel_oplock: Unable to get "
180 "kernel oplock on file %s, file_id %s "
181 "gen_id = %ul. Error was %s\n",
182 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
183 fsp->fh->gen_id,
184 strerror(errno) ));
185 } else {
186 DEBUG(5,("irix_set_kernel_oplock: Refused oplock on "
187 "file %s, fd = %d, file_id = %s, "
188 "gen_id = %ul. Another process had the file "
189 "open.\n",
190 fsp->fsp_name, fsp->fh->fd,
191 file_id_string_tos(&fsp->file_id),
192 fsp->fh->gen_id ));
193 }
194 return False;
195 }
196
197 DEBUG(10,("irix_set_kernel_oplock: got kernel oplock on file %s, file_id = %s "
198 "gen_id = %ul\n",
199 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
200 fsp->fh->gen_id));
201
202 return True;
203}
204
205/****************************************************************************
206 Release a kernel oplock on a file.
207****************************************************************************/
208
209static void irix_release_kernel_oplock(files_struct *fsp)
210{
211 if (DEBUGLVL(10)) {
212 /*
213 * Check and print out the current kernel
214 * oplock state of this file.
215 */
216 int state = sys_fcntl_long(fsp->fh->fd, F_OPLKACK, -1);
217 dbgtext("irix_release_kernel_oplock: file %s, file_id = %s"
218 "gen_id = %ul, has kernel oplock state "
219 "of %x.\n", fsp->fsp_name, file_id_string_tos(&fsp->file_id),
220 fsp->fh->gen_id, state );
221 }
222
223 /*
224 * Remove the kernel oplock on this file.
225 */
226 if(sys_fcntl_long(fsp->fh->fd, F_OPLKACK, OP_REVOKE) < 0) {
227 if( DEBUGLVL( 0 )) {
228 dbgtext("irix_release_kernel_oplock: Error when "
229 "removing kernel oplock on file " );
230 dbgtext("%s, file_id = %s gen_id = %ul. "
231 "Error was %s\n",
232 fsp->fsp_name, file_id_string_tos(&fsp->file_id),
233 fsp->fh->gen_id,
234 strerror(errno) );
235 }
236 }
237}
238
239/****************************************************************************
240 See if there is a message waiting in this fd set.
241 Note that fds MAY BE NULL ! If so we must do our own select.
242****************************************************************************/
243
244static bool irix_oplock_msg_waiting(fd_set *fds)
245{
246 int selrtn;
247 fd_set myfds;
248 struct timeval to;
249
250 if (oplock_pipe_read == -1)
251 return False;
252
253 if (fds) {
254 return FD_ISSET(oplock_pipe_read, fds);
255 }
256
257 /* Do a zero-time select. We just need to find out if there
258 * are any outstanding messages. We use sys_select_intr as
259 * we need to ignore any signals. */
260
261 FD_ZERO(&myfds);
262 FD_SET(oplock_pipe_read, &myfds);
263
264 to = timeval_set(0, 0);
265 selrtn = sys_select_intr(oplock_pipe_read+1,&myfds,NULL,NULL,&to);
266 return (selrtn == 1) ? True : False;
267}
268
269/****************************************************************************
270 Setup kernel oplocks.
271****************************************************************************/
272
273struct kernel_oplocks *irix_init_kernel_oplocks(void)
274{
275 int pfd[2];
276 static struct kernel_oplocks koplocks;
277
278 if (!irix_oplocks_available())
279 return NULL;
280
281 if(pipe(pfd) != 0) {
282 DEBUG(0,("setup_kernel_oplock_pipe: Unable to create pipe. "
283 "Error was %s\n", strerror(errno) ));
284 return False;
285 }
286
287 oplock_pipe_read = pfd[0];
288 oplock_pipe_write = pfd[1];
289
290 koplocks.receive_message = irix_oplock_receive_message;
291 koplocks.set_oplock = irix_set_kernel_oplock;
292 koplocks.release_oplock = irix_release_kernel_oplock;
293 koplocks.msg_waiting = irix_oplock_msg_waiting;
294 koplocks.notification_fd = oplock_pipe_read;
295
296 return &koplocks;
297}
298#else
299 void oplock_irix_dummy(void);
300 void oplock_irix_dummy(void) {}
301#endif /* HAVE_KERNEL_OPLOCKS_IRIX */
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