2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
9 * Portions Copyright (c) 2006,2008 Sine Nomine Associates
15 Institution: The Information Technology Center, Carnegie-Mellon University
19 #ifndef AFS_PTHREAD_ENV
20 #define USUAL_PRIORITY (LWP_MAX_PRIORITY - 2)
23 * stack size increased from 8K because the HP machine seemed to have trouble
24 * with the smaller stack
26 #define USUAL_STACK_SIZE (24 * 1024)
27 #endif /* !AFS_PTHREAD_ENV */
31 File server synchronization with external volume utilities.
32 client-side implementation
35 #include <afsconfig.h>
36 #include <afs/param.h>
40 #include <afs/afs_assert.h>
42 #include <afs/afsint.h>
43 #include <afs/errors.h>
44 #include <afs/afssyscalls.h>
47 #include "daemon_com.h"
54 #include "partition.h"
57 #ifdef FSSYNC_BUILD_CLIENT
61 static SYNC_client_state fssync_state =
62 { -1, /* file descriptor */
63 FSSYNC_ENDPOINT_DECL, /* server endpoint */
64 FSYNC_PROTO_VERSION, /* protocol version */
65 5, /* connect retry limit */
66 120, /* hard timeout */
67 "FSSYNC", /* protocol name string */
70 #ifdef AFS_PTHREAD_ENV
71 static pthread_mutex_t vol_fsync_mutex;
72 static volatile int vol_fsync_mutex_init = 0;
73 #define VFSYNC_LOCK MUTEX_ENTER(&vol_fsync_mutex)
74 #define VFSYNC_UNLOCK MUTEX_EXIT(&vol_fsync_mutex)
81 FSYNC_clientInit(void)
83 #ifdef AFS_PTHREAD_ENV
84 /* this is safe since it gets called with VOL_LOCK held, or before we go multithreaded */
85 if (!vol_fsync_mutex_init) {
86 MUTEX_INIT(&vol_fsync_mutex, "vol fsync", MUTEX_DEFAULT, 0);
87 vol_fsync_mutex_init = 1;
90 return SYNC_connect(&fssync_state);
94 FSYNC_clientFinis(void)
96 SYNC_closeChannel(&fssync_state);
100 FSYNC_clientChildProcReconnect(void)
102 return SYNC_reconnect(&fssync_state);
105 /* fsync client interface */
107 FSYNC_askfs(SYNC_command * com, SYNC_response * res)
112 code = SYNC_ask(&fssync_state, com, res);
120 case SYNC_BAD_COMMAND:
121 Log("FSYNC_askfs: fatal FSSYNC protocol error; volume management functionality disabled until next fileserver restart\n");
124 Log("FSYNC_askfs: FSSYNC request denied for reason=%d\n", res->hdr.reason);
127 Log("FSYNC_askfs: unknown protocol response %d\n", code);
135 * FSSYNC volume operations client interface.
137 * @param[in] volume volume id
138 * @param[in] partName partition name string
139 * @param[in] com FSSYNC command code
140 * @param[in] reason FSSYNC reason sub-code
141 * @param[out] res response message
143 * @return operation status
144 * @retval SYNC_OK success
147 FSYNC_GenericOp(void * ext_hdr, size_t ext_len,
148 int command, int reason,
149 SYNC_response * res_in)
151 SYNC_response res_l, *res;
158 res_l.payload.buf = NULL;
159 res_l.payload.len = 0;
162 memset(&com, 0, sizeof(com));
164 com.hdr.programType = programType;
165 com.hdr.command = command;
166 com.hdr.reason = reason;
167 com.hdr.command_len = sizeof(com.hdr) + ext_len;
168 com.payload.buf = ext_hdr;
169 com.payload.len = ext_len;
171 return FSYNC_askfs(&com, res);
175 FSYNC_VolOp(VolumeId volume, char * partition,
176 int command, int reason,
179 FSSYNC_VolOp_hdr vcom;
181 memset(&vcom, 0, sizeof(vcom));
183 vcom.volume = volume;
185 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
187 return FSYNC_GenericOp(&vcom, sizeof(vcom), command, reason, res);
191 * verify that the fileserver still thinks we have a volume checked out.
193 * In DAFS, a non-fileserver program accesses a volume by checking it out from
194 * the fileserver (FSYNC_VOL_OFF or FSYNC_VOL_NEEDVOLUME), and then locks the
195 * volume. There is a possibility that the fileserver crashes or restarts for
196 * some reason between volume checkout and locking; if this happens, the
197 * fileserver could attach the volume before we had a chance to lock it. This
198 * function serves to detect if this has happened; it must be called after
199 * volume checkout and locking to make sure the fileserver still thinks we
200 * have the volume. (If it doesn't, we should try to check it out again.)
202 * @param[in] volume volume ID
203 * @param[in] partition partition name string
204 * @param[in] command the command that was used to checkout the volume
205 * @param[in] reason the reason code used to checkout the volume
207 * @return operation status
208 * @retval SYNC_OK the fileserver could not have attached the volume since
209 * it was checked out (either it thinks it is still checked
210 * out, or it doesn't know about the volume)
211 * @retval SYNC_DENIED fileserver may have restarted since checkout; checkout
212 * should be reattempted
213 * @retval SYNC_COM_ERROR internal/fatal error
216 FSYNC_VerifyCheckout(VolumeId volume, char * partition,
217 afs_int32 command, afs_int32 reason)
220 FSSYNC_VolOp_info vop;
224 res.hdr.response_len = sizeof(res.hdr);
225 res.payload.buf = &vop;
226 res.payload.len = sizeof(vop);
228 code = FSYNC_VolOp(volume, partition, FSYNC_VOL_QUERY_VOP, FSYNC_WHATEVER, &res);
229 if (code != SYNC_OK) {
230 if (res.hdr.reason == FSYNC_NO_PENDING_VOL_OP) {
231 Log("FSYNC_VerifyCheckout: fileserver claims no vop for vol %lu "
232 "part %s; fileserver may have restarted since checkout\n",
233 afs_printable_uint32_lu(volume), partition);
237 if (res.hdr.reason == FSYNC_UNKNOWN_VOLID ||
238 res.hdr.reason == FSYNC_WRONG_PART) {
239 /* if the fileserver does not know about this volume on this
240 * partition, there's no way it could have attached it, so we're
245 Log("FSYNC_VerifyCheckout: FSYNC_VOL_QUERY_VOP failed for vol %lu "
246 "part %s with code %ld reason %ld\n",
247 afs_printable_uint32_lu(volume), partition,
248 afs_printable_int32_ld(code),
249 afs_printable_int32_ld(res.hdr.reason));
250 return SYNC_COM_ERROR;
255 /* Check if the current vol op is us. Checking pid is probably enough, but
256 * be a little bit paranoid. We could also probably check tid, but I'm not
257 * completely confident of its reliability on all platforms (on pthread
258 * envs, we coerce a pthread_t to an afs_int32, which is not guaranteed
259 * to mean anything significant). */
261 if (vop.com.programType == programType && vop.com.pid == pid &&
262 vop.com.command == command && vop.com.reason == reason) {
264 /* looks like the current pending vol op is the same one as the one
265 * with which we checked it out. success. */
269 Log("FSYNC_VerifyCheckout: vop for vol %lu part %s does not match "
270 "expectations (got pt %ld pid %ld cmd %ld reason %ld, but expected "
271 "pt %ld pid %ld cmd %ld reason %ld); fileserver may have restarted "
272 "since checkout\n", afs_printable_uint32_lu(volume), partition,
273 afs_printable_int32_ld(vop.com.programType),
274 afs_printable_int32_ld(vop.com.pid),
275 afs_printable_int32_ld(vop.com.command),
276 afs_printable_int32_ld(vop.com.reason),
277 afs_printable_int32_ld(programType),
278 afs_printable_int32_ld(pid),
279 afs_printable_int32_ld(command),
280 afs_printable_int32_ld(reason));
286 FSYNC_StatsOp(FSSYNC_StatsOp_hdr * scom, int command, int reason,
289 return FSYNC_GenericOp(scom, sizeof(*scom), command, reason, res);
293 * query the volume group cache.
295 * @param[in] part vice partition path
296 * @param[in] volid volume id
297 * @param[out] qry query response object
298 * @param[out] res SYNC response message
300 * @return operation status
301 * @retval SYNC_OK success
304 FSYNC_VGCQuery(char * part,
306 FSSYNC_VGQry_response_t * qry,
315 res->hdr.response_len = sizeof(res->hdr);
316 res->payload.buf = qry;
317 res->payload.len = sizeof(*qry);
319 return FSYNC_VolOp(volid, part, FSYNC_VG_QUERY, 0, res);
323 * perform an update operation on the VGC.
325 * @param[in] parent rw volume
326 * @param[in] child volume id to add
327 * @param[in] partition name of vice partition on which this VG resides
328 * @param[in] opcode FSSYNC VG cache opcode
329 * @param[in] reason FSSYNC reason code
330 * @param[out] res SYNC response message
332 * @return operation status
333 * @retval SYNC_OK success
338 _FSYNC_VGCUpdate(char * partition,
345 FSSYNC_VGUpdate_command_t vcom;
347 memset(&vcom, 0, sizeof(vcom));
349 vcom.parent = parent;
352 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
354 return FSYNC_GenericOp(&vcom, sizeof(vcom), opcode, reason, res);
358 * Add volume to volume group cache.
360 * @param[in] parent rw volume
361 * @param[in] child volume id to add
362 * @param[in] partition name of vice partition on which this VG resides
363 * @param[in] reason FSSYNC reason code
364 * @param[out] res SYNC response message
366 * @return operation status
367 * @retval SYNC_OK success
370 FSYNC_VGCAdd(char * partition,
376 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_ADD, reason, res);
380 * Delete volume from volume group cache.
382 * @param[in] parent rw volume
383 * @param[in] child volume id to add
384 * @param[in] partition name of vice partition on which this VG resides
385 * @param[in] reason FSSYNC reason code
386 * @param[out] res SYNC response message
388 * @return operation status
389 * @retval SYNC_OK success
392 FSYNC_VGCDel(char * partition,
398 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_DEL, reason, res);
402 * perform an asynchronous volume group scan.
404 * @param[in] partition vice partition string
405 * @param[in] reason FSSYNC reason code
407 * @note if partition is NULL, all vice partitions will be scanned.
409 * @return operation status
410 * @retval SYNC_OK success
413 FSYNC_VGCScan(char * partition, int reason)
417 if (partition == NULL) {
418 command = FSYNC_VG_SCAN_ALL;
421 command = FSYNC_VG_SCAN;
424 return FSYNC_VolOp(0, partition, command, reason, NULL);
427 #endif /* FSSYNC_BUILD_CLIENT */