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>
41 #include <afs/afsint.h>
42 #include <afs/errors.h>
43 #include <afs/afssyscalls.h>
46 #include "daemon_com.h"
53 #include "partition.h"
56 #ifdef FSSYNC_BUILD_CLIENT
60 static SYNC_client_state fssync_state =
61 { -1, /* file descriptor */
62 FSSYNC_ENDPOINT_DECL, /* server endpoint */
63 FSYNC_PROTO_VERSION, /* protocol version */
64 5, /* connect retry limit */
65 120, /* hard timeout */
66 "FSSYNC", /* protocol name string */
69 #ifdef AFS_PTHREAD_ENV
70 static pthread_mutex_t vol_fsync_mutex;
71 static volatile int vol_fsync_mutex_init = 0;
72 #define VFSYNC_LOCK MUTEX_ENTER(&vol_fsync_mutex)
73 #define VFSYNC_UNLOCK MUTEX_EXIT(&vol_fsync_mutex)
80 FSYNC_clientInit(void)
82 #ifdef AFS_PTHREAD_ENV
83 /* this is safe since it gets called with VOL_LOCK held, or before we go multithreaded */
84 if (!vol_fsync_mutex_init) {
85 MUTEX_INIT(&vol_fsync_mutex, "vol fsync", MUTEX_DEFAULT, 0);
86 vol_fsync_mutex_init = 1;
89 return SYNC_connect(&fssync_state);
93 FSYNC_clientFinis(void)
95 SYNC_closeChannel(&fssync_state);
99 FSYNC_clientChildProcReconnect(void)
101 return SYNC_reconnect(&fssync_state);
104 /* fsync client interface */
106 FSYNC_askfs(SYNC_command * com, SYNC_response * res)
111 code = SYNC_ask(&fssync_state, com, res);
119 case SYNC_BAD_COMMAND:
120 Log("FSYNC_askfs: fatal FSSYNC protocol error; volume management functionality disabled until next fileserver restart\n");
123 Log("FSYNC_askfs: FSSYNC request denied for reason=%d\n", res->hdr.reason);
126 Log("FSYNC_askfs: unknown protocol response %d\n", code);
134 * FSSYNC volume operations client interface.
136 * @param[in] volume volume id
137 * @param[in] partName partition name string
138 * @param[in] com FSSYNC command code
139 * @param[in] reason FSSYNC reason sub-code
140 * @param[out] res response message
142 * @return operation status
143 * @retval SYNC_OK success
146 FSYNC_GenericOp(void * ext_hdr, size_t ext_len,
147 int command, int reason,
148 SYNC_response * res_in)
150 SYNC_response res_l, *res;
157 res_l.payload.buf = NULL;
158 res_l.payload.len = 0;
161 memset(&com, 0, sizeof(com));
163 com.hdr.programType = programType;
164 com.hdr.command = command;
165 com.hdr.reason = reason;
166 com.hdr.command_len = sizeof(com.hdr) + ext_len;
167 com.payload.buf = ext_hdr;
168 com.payload.len = ext_len;
170 return FSYNC_askfs(&com, res);
174 FSYNC_VolOp(VolumeId volume, char * partition,
175 int command, int reason,
178 FSSYNC_VolOp_hdr vcom;
180 memset(&vcom, 0, sizeof(vcom));
182 vcom.volume = volume;
184 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
186 return FSYNC_GenericOp(&vcom, sizeof(vcom), command, reason, res);
190 * verify that the fileserver still thinks we have a volume checked out.
192 * In DAFS, a non-fileserver program accesses a volume by checking it out from
193 * the fileserver (FSYNC_VOL_OFF or FSYNC_VOL_NEEDVOLUME), and then locks the
194 * volume. There is a possibility that the fileserver crashes or restarts for
195 * some reason between volume checkout and locking; if this happens, the
196 * fileserver could attach the volume before we had a chance to lock it. This
197 * function serves to detect if this has happened; it must be called after
198 * volume checkout and locking to make sure the fileserver still thinks we
199 * have the volume. (If it doesn't, we should try to check it out again.)
201 * @param[in] volume volume ID
202 * @param[in] partition partition name string
203 * @param[in] command the command that was used to checkout the volume
204 * @param[in] reason the reason code used to checkout the volume
206 * @return operation status
207 * @retval SYNC_OK the fileserver could not have attached the volume since
208 * it was checked out (either it thinks it is still checked
209 * out, or it doesn't know about the volume)
210 * @retval SYNC_DENIED fileserver may have restarted since checkout; checkout
211 * should be reattempted
212 * @retval SYNC_COM_ERROR internal/fatal error
215 FSYNC_VerifyCheckout(VolumeId volume, char * partition,
216 afs_int32 command, afs_int32 reason)
219 FSSYNC_VolOp_info vop;
223 res.hdr.response_len = sizeof(res.hdr);
224 res.payload.buf = &vop;
225 res.payload.len = sizeof(vop);
227 code = FSYNC_VolOp(volume, partition, FSYNC_VOL_QUERY_VOP, FSYNC_WHATEVER, &res);
228 if (code != SYNC_OK) {
229 if (res.hdr.reason == FSYNC_NO_PENDING_VOL_OP) {
230 Log("FSYNC_VerifyCheckout: fileserver claims no vop for vol %lu "
231 "part %s; fileserver may have restarted since checkout\n",
232 afs_printable_uint32_lu(volume), partition);
236 if (res.hdr.reason == FSYNC_UNKNOWN_VOLID ||
237 res.hdr.reason == FSYNC_WRONG_PART) {
238 /* if the fileserver does not know about this volume on this
239 * partition, there's no way it could have attached it, so we're
244 Log("FSYNC_VerifyCheckout: FSYNC_VOL_QUERY_VOP failed for vol %lu "
245 "part %s with code %ld reason %ld\n",
246 afs_printable_uint32_lu(volume), partition,
247 afs_printable_int32_ld(code),
248 afs_printable_int32_ld(res.hdr.reason));
249 return SYNC_COM_ERROR;
254 /* Check if the current vol op is us. Checking pid is probably enough, but
255 * be a little bit paranoid. We could also probably check tid, but I'm not
256 * completely confident of its reliability on all platforms (on pthread
257 * envs, we coerce a pthread_t to an afs_int32, which is not guaranteed
258 * to mean anything significant). */
260 if (vop.com.programType == programType && vop.com.pid == pid &&
261 vop.com.command == command && vop.com.reason == reason) {
263 /* looks like the current pending vol op is the same one as the one
264 * with which we checked it out. success. */
268 Log("FSYNC_VerifyCheckout: vop for vol %lu part %s does not match "
269 "expectations (got pt %ld pid %ld cmd %ld reason %ld, but expected "
270 "pt %ld pid %ld cmd %ld reason %ld); fileserver may have restarted "
271 "since checkout\n", afs_printable_uint32_lu(volume), partition,
272 afs_printable_int32_ld(vop.com.programType),
273 afs_printable_int32_ld(vop.com.pid),
274 afs_printable_int32_ld(vop.com.command),
275 afs_printable_int32_ld(vop.com.reason),
276 afs_printable_int32_ld(programType),
277 afs_printable_int32_ld(pid),
278 afs_printable_int32_ld(command),
279 afs_printable_int32_ld(reason));
285 FSYNC_StatsOp(FSSYNC_StatsOp_hdr * scom, int command, int reason,
288 return FSYNC_GenericOp(scom, sizeof(*scom), command, reason, res);
292 * query the volume group cache.
294 * @param[in] part vice partition path
295 * @param[in] volid volume id
296 * @param[out] qry query response object
297 * @param[out] res SYNC response message
299 * @return operation status
300 * @retval SYNC_OK success
303 FSYNC_VGCQuery(char * part,
305 FSSYNC_VGQry_response_t * qry,
314 res->hdr.response_len = sizeof(res->hdr);
315 res->payload.buf = qry;
316 res->payload.len = sizeof(*qry);
318 return FSYNC_VolOp(volid, part, FSYNC_VG_QUERY, 0, res);
322 * perform an update operation on the VGC.
324 * @param[in] parent rw volume
325 * @param[in] child volume id to add
326 * @param[in] partition name of vice partition on which this VG resides
327 * @param[in] opcode FSSYNC VG cache opcode
328 * @param[in] reason FSSYNC reason code
329 * @param[out] res SYNC response message
331 * @return operation status
332 * @retval SYNC_OK success
337 _FSYNC_VGCUpdate(char * partition,
344 FSSYNC_VGUpdate_command_t vcom;
346 memset(&vcom, 0, sizeof(vcom));
348 vcom.parent = parent;
351 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
353 return FSYNC_GenericOp(&vcom, sizeof(vcom), opcode, reason, res);
357 * Add volume to volume group cache.
359 * @param[in] parent rw volume
360 * @param[in] child volume id to add
361 * @param[in] partition name of vice partition on which this VG resides
362 * @param[in] reason FSSYNC reason code
363 * @param[out] res SYNC response message
365 * @return operation status
366 * @retval SYNC_OK success
369 FSYNC_VGCAdd(char * partition,
375 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_ADD, reason, res);
379 * Delete volume from volume group cache.
381 * @param[in] parent rw volume
382 * @param[in] child volume id to add
383 * @param[in] partition name of vice partition on which this VG resides
384 * @param[in] reason FSSYNC reason code
385 * @param[out] res SYNC response message
387 * @return operation status
388 * @retval SYNC_OK success
391 FSYNC_VGCDel(char * partition,
397 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_DEL, reason, res);
401 * perform an asynchronous volume group scan.
403 * @param[in] partition vice partition string
404 * @param[in] reason FSSYNC reason code
406 * @note if partition is NULL, all vice partitions will be scanned.
408 * @return operation status
409 * @retval SYNC_OK success
412 FSYNC_VGCScan(char * partition, int reason)
416 if (partition == NULL) {
417 command = FSYNC_VG_SCAN_ALL;
420 command = FSYNC_VG_SCAN;
423 return FSYNC_VolOp(0, partition, command, reason, NULL);
426 #endif /* FSSYNC_BUILD_CLIENT */