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>
39 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/socket.h>
47 #include <netinet/in.h>
52 #include <afs/afs_assert.h>
57 #include <afs/afsint.h>
59 #include <afs/errors.h>
60 #include "daemon_com.h"
64 #include <afs/afssyscalls.h>
68 #include "partition.h"
71 #ifdef FSSYNC_BUILD_CLIENT
75 static SYNC_client_state fssync_state =
76 { -1, /* file descriptor */
77 FSSYNC_ENDPOINT_DECL, /* server endpoint */
78 FSYNC_PROTO_VERSION, /* protocol version */
79 5, /* connect retry limit */
80 120, /* hard timeout */
81 "FSSYNC", /* protocol name string */
84 #ifdef AFS_PTHREAD_ENV
85 static pthread_mutex_t vol_fsync_mutex;
86 static volatile int vol_fsync_mutex_init = 0;
87 #define VFSYNC_LOCK MUTEX_ENTER(&vol_fsync_mutex)
88 #define VFSYNC_UNLOCK MUTEX_EXIT(&vol_fsync_mutex)
95 FSYNC_clientInit(void)
97 #ifdef AFS_PTHREAD_ENV
98 /* this is safe since it gets called with VOL_LOCK held, or before we go multithreaded */
99 if (!vol_fsync_mutex_init) {
100 MUTEX_INIT(&vol_fsync_mutex, "vol fsync", MUTEX_DEFAULT, 0);
101 vol_fsync_mutex_init = 1;
104 return SYNC_connect(&fssync_state);
108 FSYNC_clientFinis(void)
110 SYNC_closeChannel(&fssync_state);
114 FSYNC_clientChildProcReconnect(void)
116 return SYNC_reconnect(&fssync_state);
119 /* fsync client interface */
121 FSYNC_askfs(SYNC_command * com, SYNC_response * res)
126 code = SYNC_ask(&fssync_state, com, res);
134 case SYNC_BAD_COMMAND:
135 Log("FSYNC_askfs: fatal FSSYNC protocol error; volume management functionality disabled until next fileserver restart\n");
138 Log("FSYNC_askfs: FSSYNC request denied for reason=%d\n", res->hdr.reason);
141 Log("FSYNC_askfs: unknown protocol response %d\n", code);
149 * FSSYNC volume operations client interface.
151 * @param[in] volume volume id
152 * @param[in] partName partition name string
153 * @param[in] com FSSYNC command code
154 * @param[in] reason FSSYNC reason sub-code
155 * @param[out] res response message
157 * @return operation status
158 * @retval SYNC_OK success
161 FSYNC_GenericOp(void * ext_hdr, size_t ext_len,
162 int command, int reason,
163 SYNC_response * res_in)
165 SYNC_response res_l, *res;
172 res_l.payload.buf = NULL;
173 res_l.payload.len = 0;
176 memset(&com, 0, sizeof(com));
178 com.hdr.programType = programType;
179 com.hdr.command = command;
180 com.hdr.reason = reason;
181 com.hdr.command_len = sizeof(com.hdr) + ext_len;
182 com.payload.buf = ext_hdr;
183 com.payload.len = ext_len;
185 return FSYNC_askfs(&com, res);
189 FSYNC_VolOp(VolumeId volume, char * partition,
190 int command, int reason,
193 FSSYNC_VolOp_hdr vcom;
195 memset(&vcom, 0, sizeof(vcom));
197 vcom.volume = volume;
199 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
201 return FSYNC_GenericOp(&vcom, sizeof(vcom), command, reason, res);
205 * verify that the fileserver still thinks we have a volume checked out.
207 * In DAFS, a non-fileserver program accesses a volume by checking it out from
208 * the fileserver (FSYNC_VOL_OFF or FSYNC_VOL_NEEDVOLUME), and then locks the
209 * volume. There is a possibility that the fileserver crashes or restarts for
210 * some reason between volume checkout and locking; if this happens, the
211 * fileserver could attach the volume before we had a chance to lock it. This
212 * function serves to detect if this has happened; it must be called after
213 * volume checkout and locking to make sure the fileserver still thinks we
214 * have the volume. (If it doesn't, we should try to check it out again.)
216 * @param[in] volume volume ID
217 * @param[in] partition partition name string
218 * @param[in] command the command that was used to checkout the volume
219 * @param[in] reason the reason code used to checkout the volume
221 * @return operation status
222 * @retval SYNC_OK the fileserver could not have attached the volume since
223 * it was checked out (either it thinks it is still checked
224 * out, or it doesn't know about the volume)
225 * @retval SYNC_DENIED fileserver may have restarted since checkout; checkout
226 * should be reattempted
227 * @retval SYNC_COM_ERROR internal/fatal error
230 FSYNC_VerifyCheckout(VolumeId volume, char * partition,
231 afs_int32 command, afs_int32 reason)
234 FSSYNC_VolOp_info vop;
238 res.hdr.response_len = sizeof(res.hdr);
239 res.payload.buf = &vop;
240 res.payload.len = sizeof(vop);
242 code = FSYNC_VolOp(volume, partition, FSYNC_VOL_QUERY_VOP, FSYNC_WHATEVER, &res);
243 if (code != SYNC_OK) {
244 if (res.hdr.reason == FSYNC_NO_PENDING_VOL_OP) {
245 Log("FSYNC_VerifyCheckout: fileserver claims no vop for vol %lu "
246 "part %s; fileserver may have restarted since checkout\n",
247 afs_printable_uint32_lu(volume), partition);
251 if (res.hdr.reason == FSYNC_UNKNOWN_VOLID) {
252 /* if the fileserver does not know about this volume, there's no
253 * way it could have attached it, so we're fine */
257 Log("FSYNC_VerifyCheckout: FSYNC_VOL_QUERY_VOP failed for vol %lu "
258 "part %s with code %ld reason %ld\n",
259 afs_printable_uint32_lu(volume), partition,
260 afs_printable_int32_ld(code),
261 afs_printable_int32_ld(res.hdr.reason));
262 return SYNC_COM_ERROR;
267 /* Check if the current vol op is us. Checking pid is probably enough, but
268 * be a little bit paranoid. We could also probably check tid, but I'm not
269 * completely confident of its reliability on all platforms (on pthread
270 * envs, we coerce a pthread_t to an afs_int32, which is not guaranteed
271 * to mean anything significant). */
273 if (vop.com.programType == programType && vop.com.pid == pid &&
274 vop.com.command == command && vop.com.reason == reason) {
276 /* looks like the current pending vol op is the same one as the one
277 * with which we checked it out. success. */
281 Log("FSYNC_VerifyCheckout: vop for vol %lu part %s does not match "
282 "expectations (got pt %ld pid %ld cmd %ld reason %ld, but expected "
283 "pt %ld pid %ld cmd %ld reason %ld); fileserver may have restarted "
284 "since checkout\n", afs_printable_uint32_lu(volume), partition,
285 afs_printable_int32_ld(vop.com.programType),
286 afs_printable_int32_ld(vop.com.pid),
287 afs_printable_int32_ld(vop.com.command),
288 afs_printable_int32_ld(vop.com.reason),
289 afs_printable_int32_ld(programType),
290 afs_printable_int32_ld(pid),
291 afs_printable_int32_ld(command),
292 afs_printable_int32_ld(reason));
298 FSYNC_StatsOp(FSSYNC_StatsOp_hdr * scom, int command, int reason,
301 return FSYNC_GenericOp(scom, sizeof(*scom), command, reason, res);
305 * query the volume group cache.
307 * @param[in] part vice partition path
308 * @param[in] volid volume id
309 * @param[out] qry query response object
310 * @param[out] res SYNC response message
312 * @return operation status
313 * @retval SYNC_OK success
316 FSYNC_VGCQuery(char * part,
318 FSSYNC_VGQry_response_t * qry,
327 res->hdr.response_len = sizeof(res->hdr);
328 res->payload.buf = qry;
329 res->payload.len = sizeof(*qry);
331 return FSYNC_VolOp(volid, part, FSYNC_VG_QUERY, 0, res);
335 * perform an update operation on the VGC.
337 * @param[in] parent rw volume
338 * @param[in] child volume id to add
339 * @param[in] partition name of vice partition on which this VG resides
340 * @param[in] opcode FSSYNC VG cache opcode
341 * @param[in] reason FSSYNC reason code
342 * @param[out] res SYNC response message
344 * @return operation status
345 * @retval SYNC_OK success
350 _FSYNC_VGCUpdate(char * partition,
357 FSSYNC_VGUpdate_command_t vcom;
359 memset(&vcom, 0, sizeof(vcom));
361 vcom.parent = parent;
364 strlcpy(vcom.partName, partition, sizeof(vcom.partName));
366 return FSYNC_GenericOp(&vcom, sizeof(vcom), opcode, reason, res);
370 * Add volume to volume group cache.
372 * @param[in] parent rw volume
373 * @param[in] child volume id to add
374 * @param[in] partition name of vice partition on which this VG resides
375 * @param[in] reason FSSYNC reason code
376 * @param[out] res SYNC response message
378 * @return operation status
379 * @retval SYNC_OK success
382 FSYNC_VGCAdd(char * partition,
388 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_ADD, reason, res);
392 * Delete volume from volume group cache.
394 * @param[in] parent rw volume
395 * @param[in] child volume id to add
396 * @param[in] partition name of vice partition on which this VG resides
397 * @param[in] reason FSSYNC reason code
398 * @param[out] res SYNC response message
400 * @return operation status
401 * @retval SYNC_OK success
404 FSYNC_VGCDel(char * partition,
410 return _FSYNC_VGCUpdate(partition, parent, child, FSYNC_VG_DEL, reason, res);
414 * perform an asynchronous volume group scan.
416 * @param[in] partition vice partition string
417 * @param[in] reason FSSYNC reason code
419 * @note if partition is NULL, all vice partitions will be scanned.
421 * @return operation status
422 * @retval SYNC_OK success
425 FSYNC_VGCScan(char * partition, int reason)
429 if (partition == NULL) {
430 command = FSYNC_VG_SCAN_ALL;
433 command = FSYNC_VG_SCAN;
436 return FSYNC_VolOp(0, partition, command, reason, NULL);
439 #endif /* FSSYNC_BUILD_CLIENT */