projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
libceph: start tracking connection socket state
[linux-2.6-block.git] / net / ceph / osd_client.c
CommitLineData
3d14c5d2 1#include <linux/ceph/ceph_debug.h>
f24e9980 2
3d14c5d2 3#include <linux/module.h>
f24e9980
SW		 4#include <linux/err.h>
5#include <linux/highmem.h>
6#include <linux/mm.h>
7#include <linux/pagemap.h>
8#include <linux/slab.h>
9#include <linux/uaccess.h>
68b4476b
YS		 10#ifdef CONFIG_BLOCK
11#include <linux/bio.h>
12#endif
f24e9980 13
3d14c5d2
YS		 14#include <linux/ceph/libceph.h>
15#include <linux/ceph/osd_client.h>
16#include <linux/ceph/messenger.h>
17#include <linux/ceph/decode.h>
18#include <linux/ceph/auth.h>
19#include <linux/ceph/pagelist.h>
f24e9980 20
c16e7869
SW		 21#define OSD_OP_FRONT_LEN 4096
22#define OSD_OPREPLY_FRONT_LEN 512
0d59ab81 23
9e32789f 24static const struct ceph_connection_operations osd_con_ops;
f24e9980 25
6f6c7006
SW		 26static void send_queued(struct ceph_osd_client *osdc);
27static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
a40c4f10
YS		 28static void __register_request(struct ceph_osd_client *osdc,
29 struct ceph_osd_request *req);
30static void __unregister_linger_request(struct ceph_osd_client *osdc,
31 struct ceph_osd_request *req);
56e925b6
SW		 32static void __send_request(struct ceph_osd_client *osdc,
33 struct ceph_osd_request *req);
f24e9980 34
68b4476b
YS		 35static int op_needs_trail(int op)
36{
37 switch (op) {
38 case CEPH_OSD_OP_GETXATTR:
39 case CEPH_OSD_OP_SETXATTR:
40 case CEPH_OSD_OP_CMPXATTR:
41 case CEPH_OSD_OP_CALL:
a40c4f10 42 case CEPH_OSD_OP_NOTIFY:
68b4476b
YS		 43 return 1;
44 default:
45 return 0;
46 }
47}
48
49static int op_has_extent(int op)
50{
51 return (op == CEPH_OSD_OP_READ ||
52 op == CEPH_OSD_OP_WRITE);
53}
54
3499e8a5
YS		 55void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
56 struct ceph_file_layout *layout,
57 u64 snapid,
68b4476b
YS		 58 u64 off, u64 *plen, u64 *bno,
59 struct ceph_osd_request *req,
60 struct ceph_osd_req_op *op)
3499e8a5
YS		 61{
62 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
68b4476b 63 u64 orig_len = *plen;
3499e8a5
YS		 64 u64 objoff, objlen; /* extent in object */
65
66 reqhead->snapid = cpu_to_le64(snapid);
67
68 /* object extent? */
68b4476b 69 ceph_calc_file_object_mapping(layout, off, plen, bno,
3499e8a5 70 &objoff, &objlen);
68b4476b 71 if (*plen < orig_len)
3499e8a5 72 dout(" skipping last %llu, final file extent %llu~%llu\n",
68b4476b 73 orig_len - *plen, off, *plen);
3499e8a5 74
68b4476b
YS		 75 if (op_has_extent(op->op)) {
76 op->extent.offset = objoff;
77 op->extent.length = objlen;
78 }
79 req->r_num_pages = calc_pages_for(off, *plen);
b7495fc2 80 req->r_page_alignment = off & ~PAGE_MASK;
3d14c5d2
YS		 81 if (op->op == CEPH_OSD_OP_WRITE)
82 op->payload_len = *plen;
3499e8a5
YS		 83
84 dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
85 *bno, objoff, objlen, req->r_num_pages);
86
87}
3d14c5d2 88EXPORT_SYMBOL(ceph_calc_raw_layout);
3499e8a5 89
f24e9980
SW		 90/*
91 * Implement client access to distributed object storage cluster.
92 *
93 * All data objects are stored within a cluster/cloud of OSDs, or
94 * "object storage devices." (Note that Ceph OSDs have _nothing_ to
95 * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply
96 * remote daemons serving up and coordinating consistent and safe
97 * access to storage.
98 *
99 * Cluster membership and the mapping of data objects onto storage devices
100 * are described by the osd map.
101 *
102 * We keep track of pending OSD requests (read, write), resubmit
103 * requests to different OSDs when the cluster topology/data layout
104 * change, or retry the affected requests when the communications
105 * channel with an OSD is reset.
106 */
107
108/*
109 * calculate the mapping of a file extent onto an object, and fill out the
110 * request accordingly. shorten extent as necessary if it crosses an
111 * object boundary.
112 *
113 * fill osd op in request message.
114 */
115static void calc_layout(struct ceph_osd_client *osdc,
3499e8a5
YS		 116 struct ceph_vino vino,
117 struct ceph_file_layout *layout,
f24e9980 118 u64 off, u64 *plen,
68b4476b
YS		 119 struct ceph_osd_request *req,
120 struct ceph_osd_req_op *op)
f24e9980 121{
f24e9980
SW		 122 u64 bno;
123
68b4476b
YS		 124 ceph_calc_raw_layout(osdc, layout, vino.snap, off,
125 plen, &bno, req, op);
f24e9980 126
2dab036b 127 snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno);
f24e9980 128 req->r_oid_len = strlen(req->r_oid);
f24e9980
SW		 129}
130
f24e9980
SW		 131/*
132 * requests
133 */
415e49a9 134void ceph_osdc_release_request(struct kref *kref)
f24e9980 135{
415e49a9
SW		 136 struct ceph_osd_request *req = container_of(kref,
137 struct ceph_osd_request,
138 r_kref);
139
140 if (req->r_request)
141 ceph_msg_put(req->r_request);
142 if (req->r_reply)
143 ceph_msg_put(req->r_reply);
0d59ab81 144 if (req->r_con_filling_msg) {
350b1c32 145 dout("release_request revoking pages %p from con %p\n",
0d59ab81
YS		 146 req->r_pages, req->r_con_filling_msg);
147 ceph_con_revoke_message(req->r_con_filling_msg,
148 req->r_reply);
149 ceph_con_put(req->r_con_filling_msg);
350b1c32 150 }
415e49a9
SW		 151 if (req->r_own_pages)
152 ceph_release_page_vector(req->r_pages,
153 req->r_num_pages);
68b4476b
YS		 154#ifdef CONFIG_BLOCK
155 if (req->r_bio)
156 bio_put(req->r_bio);
157#endif
415e49a9 158 ceph_put_snap_context(req->r_snapc);
68b4476b
YS		 159 if (req->r_trail) {
160 ceph_pagelist_release(req->r_trail);
161 kfree(req->r_trail);
162 }
415e49a9
SW		 163 if (req->r_mempool)
164 mempool_free(req, req->r_osdc->req_mempool);
165 else
166 kfree(req);
f24e9980 167}
3d14c5d2 168EXPORT_SYMBOL(ceph_osdc_release_request);
68b4476b
YS		 169
170static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
171{
172 int i = 0;
173
174 if (needs_trail)
175 *needs_trail = 0;
176 while (ops[i].op) {
177 if (needs_trail && op_needs_trail(ops[i].op))
178 *needs_trail = 1;
179 i++;
180 }
181
182 return i;
183}
184
3499e8a5
YS		 185struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
186 int flags,
f24e9980 187 struct ceph_snap_context *snapc,
68b4476b 188 struct ceph_osd_req_op *ops,
3499e8a5
YS		 189 bool use_mempool,
190 gfp_t gfp_flags,
68b4476b
YS		 191 struct page **pages,
192 struct bio *bio)
f24e9980
SW		 193{
194 struct ceph_osd_request *req;
195 struct ceph_msg *msg;
68b4476b
YS		 196 int needs_trail;
197 int num_op = get_num_ops(ops, &needs_trail);
198 size_t msg_size = sizeof(struct ceph_osd_request_head);
3499e8a5 199
68b4476b 200 msg_size += num_op*sizeof(struct ceph_osd_op);
f24e9980
SW		 201
202 if (use_mempool) {
3499e8a5 203 req = mempool_alloc(osdc->req_mempool, gfp_flags);
f24e9980
SW		 204 memset(req, 0, sizeof(*req));
205 } else {
3499e8a5 206 req = kzalloc(sizeof(*req), gfp_flags);
f24e9980
SW		 207 }
208 if (req == NULL)
a79832f2 209 return NULL;
f24e9980 210
f24e9980
SW		 211 req->r_osdc = osdc;
212 req->r_mempool = use_mempool;
68b4476b 213
415e49a9 214 kref_init(&req->r_kref);
f24e9980
SW		 215 init_completion(&req->r_completion);
216 init_completion(&req->r_safe_completion);
217 INIT_LIST_HEAD(&req->r_unsafe_item);
a40c4f10
YS		 218 INIT_LIST_HEAD(&req->r_linger_item);
219 INIT_LIST_HEAD(&req->r_linger_osd);
935b639a 220 INIT_LIST_HEAD(&req->r_req_lru_item);
f24e9980
SW		 221 req->r_flags = flags;
222
223 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
224
c16e7869
SW		 225 /* create reply message */
226 if (use_mempool)
227 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
228 else
229 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
b61c2763 230 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
a79832f2 231 if (!msg) {
c16e7869 232 ceph_osdc_put_request(req);
a79832f2 233 return NULL;
c16e7869
SW		 234 }
235 req->r_reply = msg;
236
68b4476b
YS		 237 /* allocate space for the trailing data */
238 if (needs_trail) {
239 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
240 if (!req->r_trail) {
241 ceph_osdc_put_request(req);
242 return NULL;
243 }
244 ceph_pagelist_init(req->r_trail);
245 }
c16e7869 246 /* create request message; allow space for oid */
224736d9 247 msg_size += MAX_OBJ_NAME_SIZE;
f24e9980
SW		 248 if (snapc)
249 msg_size += sizeof(u64) * snapc->num_snaps;
250 if (use_mempool)
8f3bc053 251 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
f24e9980 252 else
b61c2763 253 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
a79832f2 254 if (!msg) {
f24e9980 255 ceph_osdc_put_request(req);
a79832f2 256 return NULL;
f24e9980 257 }
68b4476b 258
f24e9980
SW		 259 msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
260 memset(msg->front.iov_base, 0, msg->front.iov_len);
3499e8a5
YS		 261
262 req->r_request = msg;
263 req->r_pages = pages;
68b4476b
YS		 264#ifdef CONFIG_BLOCK
265 if (bio) {
266 req->r_bio = bio;
267 bio_get(req->r_bio);
268 }
269#endif
3499e8a5
YS		 270
271 return req;
272}
3d14c5d2 273EXPORT_SYMBOL(ceph_osdc_alloc_request);
3499e8a5 274
68b4476b
YS		 275static void osd_req_encode_op(struct ceph_osd_request *req,
276 struct ceph_osd_op *dst,
277 struct ceph_osd_req_op *src)
278{
279 dst->op = cpu_to_le16(src->op);
280
065a68f9 281 switch (src->op) {
68b4476b
YS		 282 case CEPH_OSD_OP_READ:
283 case CEPH_OSD_OP_WRITE:
284 dst->extent.offset =
285 cpu_to_le64(src->extent.offset);
286 dst->extent.length =
287 cpu_to_le64(src->extent.length);
288 dst->extent.truncate_size =
289 cpu_to_le64(src->extent.truncate_size);
290 dst->extent.truncate_seq =
291 cpu_to_le32(src->extent.truncate_seq);
292 break;
293
294 case CEPH_OSD_OP_GETXATTR:
295 case CEPH_OSD_OP_SETXATTR:
296 case CEPH_OSD_OP_CMPXATTR:
297 BUG_ON(!req->r_trail);
298
299 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
300 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
301 dst->xattr.cmp_op = src->xattr.cmp_op;
302 dst->xattr.cmp_mode = src->xattr.cmp_mode;
303 ceph_pagelist_append(req->r_trail, src->xattr.name,
304 src->xattr.name_len);
305 ceph_pagelist_append(req->r_trail, src->xattr.val,
306 src->xattr.value_len);
307 break;
ae1533b6
YS		 308 case CEPH_OSD_OP_CALL:
309 BUG_ON(!req->r_trail);
310
311 dst->cls.class_len = src->cls.class_len;
312 dst->cls.method_len = src->cls.method_len;
313 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
314
315 ceph_pagelist_append(req->r_trail, src->cls.class_name,
316 src->cls.class_len);
317 ceph_pagelist_append(req->r_trail, src->cls.method_name,
318 src->cls.method_len);
319 ceph_pagelist_append(req->r_trail, src->cls.indata,
320 src->cls.indata_len);
321 break;
322 case CEPH_OSD_OP_ROLLBACK:
323 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
324 break;
68b4476b
YS		 325 case CEPH_OSD_OP_STARTSYNC:
326 break;
a40c4f10
YS		 327 case CEPH_OSD_OP_NOTIFY:
328 {
329 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
330 __le32 timeout = cpu_to_le32(src->watch.timeout);
331
332 BUG_ON(!req->r_trail);
333
334 ceph_pagelist_append(req->r_trail,
335 &prot_ver, sizeof(prot_ver));
336 ceph_pagelist_append(req->r_trail,
337 &timeout, sizeof(timeout));
338 }
339 case CEPH_OSD_OP_NOTIFY_ACK:
340 case CEPH_OSD_OP_WATCH:
341 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
342 dst->watch.ver = cpu_to_le64(src->watch.ver);
343 dst->watch.flag = src->watch.flag;
344 break;
68b4476b
YS		 345 default:
346 pr_err("unrecognized osd opcode %d\n", dst->op);
347 WARN_ON(1);
348 break;
349 }
350 dst->payload_len = cpu_to_le32(src->payload_len);
351}
352
3499e8a5
YS		 353/*
354 * build new request AND message
355 *
356 */
357void ceph_osdc_build_request(struct ceph_osd_request *req,
68b4476b
YS		 358 u64 off, u64 *plen,
359 struct ceph_osd_req_op *src_ops,
360 struct ceph_snap_context *snapc,
361 struct timespec *mtime,
362 const char *oid,
363 int oid_len)
3499e8a5
YS		 364{
365 struct ceph_msg *msg = req->r_request;
366 struct ceph_osd_request_head *head;
68b4476b 367 struct ceph_osd_req_op *src_op;
3499e8a5
YS		 368 struct ceph_osd_op *op;
369 void *p;
68b4476b 370 int num_op = get_num_ops(src_ops, NULL);
3499e8a5 371 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
3499e8a5 372 int flags = req->r_flags;
68b4476b
YS		 373 u64 data_len = 0;
374 int i;
3499e8a5 375
f24e9980
SW		 376 head = msg->front.iov_base;
377 op = (void *)(head + 1);
378 p = (void *)(op + num_op);
379
f24e9980
SW		 380 req->r_snapc = ceph_get_snap_context(snapc);
381
382 head->client_inc = cpu_to_le32(1); /* always, for now. */
383 head->flags = cpu_to_le32(flags);
384 if (flags & CEPH_OSD_FLAG_WRITE)
385 ceph_encode_timespec(&head->mtime, mtime);
386 head->num_ops = cpu_to_le16(num_op);
f24e9980 387
f24e9980
SW		 388
389 /* fill in oid */
3499e8a5
YS		 390 head->object_len = cpu_to_le32(oid_len);
391 memcpy(p, oid, oid_len);
392 p += oid_len;
f24e9980 393
68b4476b
YS		 394 src_op = src_ops;
395 while (src_op->op) {
396 osd_req_encode_op(req, op, src_op);
397 src_op++;
f24e9980 398 op++;
f24e9980 399 }
68b4476b
YS		 400
401 if (req->r_trail)
402 data_len += req->r_trail->length;
403
f24e9980
SW		 404 if (snapc) {
405 head->snap_seq = cpu_to_le64(snapc->seq);
406 head->num_snaps = cpu_to_le32(snapc->num_snaps);
407 for (i = 0; i < snapc->num_snaps; i++) {
408 put_unaligned_le64(snapc->snaps[i], p);
409 p += sizeof(u64);
410 }
411 }
412
68b4476b
YS		 413 if (flags & CEPH_OSD_FLAG_WRITE) {
414 req->r_request->hdr.data_off = cpu_to_le16(off);
415 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
416 } else if (data_len) {
417 req->r_request->hdr.data_off = 0;
418 req->r_request->hdr.data_len = cpu_to_le32(data_len);
419 }
420
c5c6b19d
SW		 421 req->r_request->page_alignment = req->r_page_alignment;
422
f24e9980 423 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
6f863e71
SW		 424 msg_size = p - msg->front.iov_base;
425 msg->front.iov_len = msg_size;
426 msg->hdr.front_len = cpu_to_le32(msg_size);
3499e8a5
YS		 427 return;
428}
3d14c5d2 429EXPORT_SYMBOL(ceph_osdc_build_request);
3499e8a5
YS		 430
431/*
432 * build new request AND message, calculate layout, and adjust file
433 * extent as needed.
434 *
435 * if the file was recently truncated, we include information about its
436 * old and new size so that the object can be updated appropriately. (we
437 * avoid synchronously deleting truncated objects because it's slow.)
438 *
439 * if @do_sync, include a 'startsync' command so that the osd will flush
440 * data quickly.
441 */
442struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
443 struct ceph_file_layout *layout,
444 struct ceph_vino vino,
445 u64 off, u64 *plen,
446 int opcode, int flags,
447 struct ceph_snap_context *snapc,
448 int do_sync,
449 u32 truncate_seq,
450 u64 truncate_size,
451 struct timespec *mtime,
b7495fc2
SW		 452 bool use_mempool, int num_reply,
453 int page_align)
3499e8a5 454{
68b4476b
YS		 455 struct ceph_osd_req_op ops[3];
456 struct ceph_osd_request *req;
457
458 ops[0].op = opcode;
459 ops[0].extent.truncate_seq = truncate_seq;
460 ops[0].extent.truncate_size = truncate_size;
461 ops[0].payload_len = 0;
462
463 if (do_sync) {
464 ops[1].op = CEPH_OSD_OP_STARTSYNC;
465 ops[1].payload_len = 0;
466 ops[2].op = 0;
467 } else
468 ops[1].op = 0;
469
470 req = ceph_osdc_alloc_request(osdc, flags,
471 snapc, ops,
3499e8a5 472 use_mempool,
68b4476b 473 GFP_NOFS, NULL, NULL);
4ad12621
SW		 474 if (!req)
475 return NULL;
3499e8a5
YS		 476
477 /* calculate max write size */
68b4476b 478 calc_layout(osdc, vino, layout, off, plen, req, ops);
3499e8a5
YS		 479 req->r_file_layout = *layout; /* keep a copy */
480
9bb0ce2b
SW		 481 /* in case it differs from natural (file) alignment that
482 calc_layout filled in for us */
483 req->r_num_pages = calc_pages_for(page_align, *plen);
b7495fc2
SW		 484 req->r_page_alignment = page_align;
485
68b4476b
YS		 486 ceph_osdc_build_request(req, off, plen, ops,
487 snapc,
3499e8a5
YS		 488 mtime,
489 req->r_oid, req->r_oid_len);
490
f24e9980
SW		 491 return req;
492}
3d14c5d2 493EXPORT_SYMBOL(ceph_osdc_new_request);
f24e9980
SW		 494
495/*
496 * We keep osd requests in an rbtree, sorted by ->r_tid.
497 */
498static void __insert_request(struct ceph_osd_client *osdc,
499 struct ceph_osd_request *new)
500{
501 struct rb_node **p = &osdc->requests.rb_node;
502 struct rb_node *parent = NULL;
503 struct ceph_osd_request *req = NULL;
504
505 while (*p) {
506 parent = *p;
507 req = rb_entry(parent, struct ceph_osd_request, r_node);
508 if (new->r_tid < req->r_tid)
509 p = &(*p)->rb_left;
510 else if (new->r_tid > req->r_tid)
511 p = &(*p)->rb_right;
512 else
513 BUG();
514 }
515
516 rb_link_node(&new->r_node, parent, p);
517 rb_insert_color(&new->r_node, &osdc->requests);
518}
519
520static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
521 u64 tid)
522{
523 struct ceph_osd_request *req;
524 struct rb_node *n = osdc->requests.rb_node;
525
526 while (n) {
527 req = rb_entry(n, struct ceph_osd_request, r_node);
528 if (tid < req->r_tid)
529 n = n->rb_left;
530 else if (tid > req->r_tid)
531 n = n->rb_right;
532 else
533 return req;
534 }
535 return NULL;
536}
537
538static struct ceph_osd_request *
539__lookup_request_ge(struct ceph_osd_client *osdc,
540 u64 tid)
541{
542 struct ceph_osd_request *req;
543 struct rb_node *n = osdc->requests.rb_node;
544
545 while (n) {
546 req = rb_entry(n, struct ceph_osd_request, r_node);
547 if (tid < req->r_tid) {
548 if (!n->rb_left)
549 return req;
550 n = n->rb_left;
551 } else if (tid > req->r_tid) {
552 n = n->rb_right;
553 } else {
554 return req;
555 }
556 }
557 return NULL;
558}
559
6f6c7006
SW		 560/*
561 * Resubmit requests pending on the given osd.
562 */
563static void __kick_osd_requests(struct ceph_osd_client *osdc,
564 struct ceph_osd *osd)
565{
a40c4f10 566 struct ceph_osd_request *req, *nreq;
6f6c7006
SW		 567 int err;
568
569 dout("__kick_osd_requests osd%d\n", osd->o_osd);
570 err = __reset_osd(osdc, osd);
571 if (err == -EAGAIN)
572 return;
573
574 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
575 list_move(&req->r_req_lru_item, &osdc->req_unsent);
576 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
577 osd->o_osd);
a40c4f10
YS		 578 if (!req->r_linger)
579 req->r_flags |= CEPH_OSD_FLAG_RETRY;
580 }
581
582 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
583 r_linger_osd) {
77f38e0e
SW		 584 /*
585 * reregister request prior to unregistering linger so
586 * that r_osd is preserved.
587 */
588 BUG_ON(!list_empty(&req->r_req_lru_item));
a40c4f10 589 __register_request(osdc, req);
77f38e0e
SW		 590 list_add(&req->r_req_lru_item, &osdc->req_unsent);
591 list_add(&req->r_osd_item, &req->r_osd->o_requests);
592 __unregister_linger_request(osdc, req);
a40c4f10
YS		 593 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
594 osd->o_osd);
6f6c7006
SW		 595 }
596}
597
598static void kick_osd_requests(struct ceph_osd_client *osdc,
599 struct ceph_osd *kickosd)
600{
601 mutex_lock(&osdc->request_mutex);
602 __kick_osd_requests(osdc, kickosd);
603 mutex_unlock(&osdc->request_mutex);
604}
f24e9980
SW		 605
606/*
81b024e7 607 * If the osd connection drops, we need to resubmit all requests.
f24e9980
SW		 608 */
609static void osd_reset(struct ceph_connection *con)
610{
611 struct ceph_osd *osd = con->private;
612 struct ceph_osd_client *osdc;
613
614 if (!osd)
615 return;
616 dout("osd_reset osd%d\n", osd->o_osd);
617 osdc = osd->o_osdc;
f24e9980 618 down_read(&osdc->map_sem);
6f6c7006
SW		 619 kick_osd_requests(osdc, osd);
620 send_queued(osdc);
f24e9980
SW		 621 up_read(&osdc->map_sem);
622}
623
624/*
625 * Track open sessions with osds.
626 */
627static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
628{
629 struct ceph_osd *osd;
630
631 osd = kzalloc(sizeof(*osd), GFP_NOFS);
632 if (!osd)
633 return NULL;
634
635 atomic_set(&osd->o_ref, 1);
636 osd->o_osdc = osdc;
637 INIT_LIST_HEAD(&osd->o_requests);
a40c4f10 638 INIT_LIST_HEAD(&osd->o_linger_requests);
f5a2041b 639 INIT_LIST_HEAD(&osd->o_osd_lru);
f24e9980
SW		 640 osd->o_incarnation = 1;
641
15d9882c 642 ceph_con_init(&osdc->client->msgr, &osd->o_con);
f24e9980
SW		 643 osd->o_con.private = osd;
644 osd->o_con.ops = &osd_con_ops;
645 osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD;
4e7a5dcd 646
422d2cb8 647 INIT_LIST_HEAD(&osd->o_keepalive_item);
f24e9980
SW		 648 return osd;
649}
650
651static struct ceph_osd *get_osd(struct ceph_osd *osd)
652{
653 if (atomic_inc_not_zero(&osd->o_ref)) {
654 dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1,
655 atomic_read(&osd->o_ref));
656 return osd;
657 } else {
658 dout("get_osd %p FAIL\n", osd);
659 return NULL;
660 }
661}
662
663static void put_osd(struct ceph_osd *osd)
664{
665 dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref),
666 atomic_read(&osd->o_ref) - 1);
a255651d 667 if (atomic_dec_and_test(&osd->o_ref) && osd->o_auth.authorizer) {
79494d1b
SW		 668 struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth;
669
a255651d 670 if (ac->ops && ac->ops->destroy_authorizer)
6c4a1915 671 ac->ops->destroy_authorizer(ac, osd->o_auth.authorizer);
f24e9980 672 kfree(osd);
79494d1b 673 }
f24e9980
SW		 674}
675
676/*
677 * remove an osd from our map
678 */
f5a2041b 679static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
f24e9980 680{
f5a2041b 681 dout("__remove_osd %p\n", osd);
f24e9980
SW		 682 BUG_ON(!list_empty(&osd->o_requests));
683 rb_erase(&osd->o_node, &osdc->osds);
f5a2041b 684 list_del_init(&osd->o_osd_lru);
f24e9980
SW		 685 ceph_con_close(&osd->o_con);
686 put_osd(osd);
687}
688
aca420bc
SW		 689static void remove_all_osds(struct ceph_osd_client *osdc)
690{
691 dout("__remove_old_osds %p\n", osdc);
692 mutex_lock(&osdc->request_mutex);
693 while (!RB_EMPTY_ROOT(&osdc->osds)) {
694 struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds),
695 struct ceph_osd, o_node);
696 __remove_osd(osdc, osd);
697 }
698 mutex_unlock(&osdc->request_mutex);
699}
700
f5a2041b
YS		 701static void __move_osd_to_lru(struct ceph_osd_client *osdc,
702 struct ceph_osd *osd)
703{
704 dout("__move_osd_to_lru %p\n", osd);
705 BUG_ON(!list_empty(&osd->o_osd_lru));
706 list_add_tail(&osd->o_osd_lru, &osdc->osd_lru);
3d14c5d2 707 osd->lru_ttl = jiffies + osdc->client->options->osd_idle_ttl * HZ;
f5a2041b
YS		 708}
709
710static void __remove_osd_from_lru(struct ceph_osd *osd)
711{
712 dout("__remove_osd_from_lru %p\n", osd);
713 if (!list_empty(&osd->o_osd_lru))
714 list_del_init(&osd->o_osd_lru);
715}
716
aca420bc 717static void remove_old_osds(struct ceph_osd_client *osdc)
f5a2041b
YS		 718{
719 struct ceph_osd *osd, *nosd;
720
721 dout("__remove_old_osds %p\n", osdc);
722 mutex_lock(&osdc->request_mutex);
723 list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) {
aca420bc 724 if (time_before(jiffies, osd->lru_ttl))
f5a2041b
YS		 725 break;
726 __remove_osd(osdc, osd);
727 }
728 mutex_unlock(&osdc->request_mutex);
729}
730
f24e9980
SW		 731/*
732 * reset osd connect
733 */
f5a2041b 734static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
f24e9980 735{
87b315a5 736 struct ceph_osd_request *req;
f24e9980
SW		 737 int ret = 0;
738
f5a2041b 739 dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
a40c4f10
YS		 740 if (list_empty(&osd->o_requests) &&
741 list_empty(&osd->o_linger_requests)) {
f5a2041b 742 __remove_osd(osdc, osd);
87b315a5
SW		 743 } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
744 &osd->o_con.peer_addr,
745 sizeof(osd->o_con.peer_addr)) == 0 &&
746 !ceph_con_opened(&osd->o_con)) {
747 dout(" osd addr hasn't changed and connection never opened,"
748 " letting msgr retry");
749 /* touch each r_stamp for handle_timeout()'s benfit */
750 list_for_each_entry(req, &osd->o_requests, r_osd_item)
751 req->r_stamp = jiffies;
752 ret = -EAGAIN;
f24e9980
SW		 753 } else {
754 ceph_con_close(&osd->o_con);
755 ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]);
756 osd->o_incarnation++;
757 }
758 return ret;
759}
760
761static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
762{
763 struct rb_node **p = &osdc->osds.rb_node;
764 struct rb_node *parent = NULL;
765 struct ceph_osd *osd = NULL;
766
aca420bc 767 dout("__insert_osd %p osd%d\n", new, new->o_osd);
f24e9980
SW		 768 while (*p) {
769 parent = *p;
770 osd = rb_entry(parent, struct ceph_osd, o_node);
771 if (new->o_osd < osd->o_osd)
772 p = &(*p)->rb_left;
773 else if (new->o_osd > osd->o_osd)
774 p = &(*p)->rb_right;
775 else
776 BUG();
777 }
778
779 rb_link_node(&new->o_node, parent, p);
780 rb_insert_color(&new->o_node, &osdc->osds);
781}
782
783static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
784{
785 struct ceph_osd *osd;
786 struct rb_node *n = osdc->osds.rb_node;
787
788 while (n) {
789 osd = rb_entry(n, struct ceph_osd, o_node);
790 if (o < osd->o_osd)
791 n = n->rb_left;
792 else if (o > osd->o_osd)
793 n = n->rb_right;
794 else
795 return osd;
796 }
797 return NULL;
798}
799
422d2cb8
YS		 800static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
801{
802 schedule_delayed_work(&osdc->timeout_work,
3d14c5d2 803 osdc->client->options->osd_keepalive_timeout * HZ);
422d2cb8
YS		 804}
805
806static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
807{
808 cancel_delayed_work(&osdc->timeout_work);
809}
f24e9980
SW		 810
811/*
812 * Register request, assign tid. If this is the first request, set up
813 * the timeout event.
814 */
a40c4f10
YS		 815static void __register_request(struct ceph_osd_client *osdc,
816 struct ceph_osd_request *req)
f24e9980 817{
f24e9980 818 req->r_tid = ++osdc->last_tid;
6df058c0 819 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
77f38e0e 820 dout("__register_request %p tid %lld\n", req, req->r_tid);
f24e9980
SW		 821 __insert_request(osdc, req);
822 ceph_osdc_get_request(req);
823 osdc->num_requests++;
f24e9980 824 if (osdc->num_requests == 1) {
422d2cb8
YS		 825 dout(" first request, scheduling timeout\n");
826 __schedule_osd_timeout(osdc);
f24e9980 827 }
a40c4f10
YS		 828}
829
830static void register_request(struct ceph_osd_client *osdc,
831 struct ceph_osd_request *req)
832{
833 mutex_lock(&osdc->request_mutex);
834 __register_request(osdc, req);
f24e9980
SW		 835 mutex_unlock(&osdc->request_mutex);
836}
837
838/*
839 * called under osdc->request_mutex
840 */
841static void __unregister_request(struct ceph_osd_client *osdc,
842 struct ceph_osd_request *req)
843{
35f9f8a0
SW		 844 if (RB_EMPTY_NODE(&req->r_node)) {
845 dout("__unregister_request %p tid %lld not registered\n",
846 req, req->r_tid);
847 return;
848 }
849
f24e9980
SW		 850 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
851 rb_erase(&req->r_node, &osdc->requests);
852 osdc->num_requests--;
853
0ba6478d
SW		 854 if (req->r_osd) {
855 /* make sure the original request isn't in flight. */
856 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
857
858 list_del_init(&req->r_osd_item);
a40c4f10
YS		 859 if (list_empty(&req->r_osd->o_requests) &&
860 list_empty(&req->r_osd->o_linger_requests)) {
861 dout("moving osd to %p lru\n", req->r_osd);
f5a2041b 862 __move_osd_to_lru(osdc, req->r_osd);
a40c4f10 863 }
fbdb9190 864 if (list_empty(&req->r_linger_item))
a40c4f10 865 req->r_osd = NULL;
0ba6478d 866 }
f24e9980
SW		 867
868 ceph_osdc_put_request(req);
869
422d2cb8
YS		 870 list_del_init(&req->r_req_lru_item);
871 if (osdc->num_requests == 0) {
872 dout(" no requests, canceling timeout\n");
873 __cancel_osd_timeout(osdc);
f24e9980
SW		 874 }
875}
876
877/*
878 * Cancel a previously queued request message
879 */
880static void __cancel_request(struct ceph_osd_request *req)
881{
6bc18876 882 if (req->r_sent && req->r_osd) {
f24e9980
SW		 883 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
884 req->r_sent = 0;
885 }
886}
887
a40c4f10
YS		 888static void __register_linger_request(struct ceph_osd_client *osdc,
889 struct ceph_osd_request *req)
890{
891 dout("__register_linger_request %p\n", req);
892 list_add_tail(&req->r_linger_item, &osdc->req_linger);
893 list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
894}
895
896static void __unregister_linger_request(struct ceph_osd_client *osdc,
897 struct ceph_osd_request *req)
898{
899 dout("__unregister_linger_request %p\n", req);
900 if (req->r_osd) {
901 list_del_init(&req->r_linger_item);
902 list_del_init(&req->r_linger_osd);
903
904 if (list_empty(&req->r_osd->o_requests) &&
905 list_empty(&req->r_osd->o_linger_requests)) {
906 dout("moving osd to %p lru\n", req->r_osd);
907 __move_osd_to_lru(osdc, req->r_osd);
908 }
fbdb9190
SW		 909 if (list_empty(&req->r_osd_item))
910 req->r_osd = NULL;
a40c4f10
YS		 911 }
912}
913
914void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
915 struct ceph_osd_request *req)
916{
917 mutex_lock(&osdc->request_mutex);
918 if (req->r_linger) {
919 __unregister_linger_request(osdc, req);
920 ceph_osdc_put_request(req);
921 }
922 mutex_unlock(&osdc->request_mutex);
923}
924EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
925
926void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
927 struct ceph_osd_request *req)
928{
929 if (!req->r_linger) {
930 dout("set_request_linger %p\n", req);
931 req->r_linger = 1;
932 /*
933 * caller is now responsible for calling
934 * unregister_linger_request
935 */
936 ceph_osdc_get_request(req);
937 }
938}
939EXPORT_SYMBOL(ceph_osdc_set_request_linger);
940
f24e9980
SW		 941/*
942 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
943 * (as needed), and set the request r_osd appropriately. If there is
25985edc 944 * no up osd, set r_osd to NULL. Move the request to the appropriate list
6f6c7006 945 * (unsent, homeless) or leave on in-flight lru.
f24e9980
SW		 946 *
947 * Return 0 if unchanged, 1 if changed, or negative on error.
948 *
949 * Caller should hold map_sem for read and request_mutex.
950 */
6f6c7006 951static int __map_request(struct ceph_osd_client *osdc,
38d6453c 952 struct ceph_osd_request *req, int force_resend)
f24e9980
SW		 953{
954 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
51042122 955 struct ceph_pg pgid;
d85b7056
SW		 956 int acting[CEPH_PG_MAX_SIZE];
957 int o = -1, num = 0;
f24e9980 958 int err;
f24e9980 959
6f6c7006 960 dout("map_request %p tid %lld\n", req, req->r_tid);
f24e9980
SW		 961 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
962 &req->r_file_layout, osdc->osdmap);
6f6c7006
SW		 963 if (err) {
964 list_move(&req->r_req_lru_item, &osdc->req_notarget);
f24e9980 965 return err;
6f6c7006 966 }
51042122 967 pgid = reqhead->layout.ol_pgid;
7740a42f
SW		 968 req->r_pgid = pgid;
969
d85b7056
SW		 970 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
971 if (err > 0) {
972 o = acting[0];
973 num = err;
974 }
f24e9980 975
38d6453c
SW		 976 if ((!force_resend &&
977 req->r_osd && req->r_osd->o_osd == o &&
d85b7056
SW		 978 req->r_sent >= req->r_osd->o_incarnation &&
979 req->r_num_pg_osds == num &&
980 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
f24e9980
SW		 981 (req->r_osd == NULL && o == -1))
982 return 0; /* no change */
983
6f6c7006 984 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
51042122 985 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
f24e9980
SW		 986 req->r_osd ? req->r_osd->o_osd : -1);
987
d85b7056
SW		 988 /* record full pg acting set */
989 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
990 req->r_num_pg_osds = num;
991
f24e9980
SW		 992 if (req->r_osd) {
993 __cancel_request(req);
994 list_del_init(&req->r_osd_item);
f24e9980
SW		 995 req->r_osd = NULL;
996 }
997
998 req->r_osd = __lookup_osd(osdc, o);
999 if (!req->r_osd && o >= 0) {
c99eb1c7
SW		 1000 err = -ENOMEM;
1001 req->r_osd = create_osd(osdc);
6f6c7006
SW		 1002 if (!req->r_osd) {
1003 list_move(&req->r_req_lru_item, &osdc->req_notarget);
c99eb1c7 1004 goto out;
6f6c7006 1005 }
f24e9980 1006
6f6c7006 1007 dout("map_request osd %p is osd%d\n", req->r_osd, o);
f24e9980
SW		 1008 req->r_osd->o_osd = o;
1009 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
1010 __insert_osd(osdc, req->r_osd);
1011
1012 ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]);
1013 }
1014
f5a2041b
YS		 1015 if (req->r_osd) {
1016 __remove_osd_from_lru(req->r_osd);
f24e9980 1017 list_add(&req->r_osd_item, &req->r_osd->o_requests);
6f6c7006
SW		 1018 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1019 } else {
1020 list_move(&req->r_req_lru_item, &osdc->req_notarget);
f5a2041b 1021 }
d85b7056 1022 err = 1; /* osd or pg changed */
f24e9980
SW		 1023
1024out:
f24e9980
SW		 1025 return err;
1026}
1027
1028/*
1029 * caller should hold map_sem (for read) and request_mutex
1030 */
56e925b6
SW		 1031static void __send_request(struct ceph_osd_client *osdc,
1032 struct ceph_osd_request *req)
f24e9980
SW		 1033{
1034 struct ceph_osd_request_head *reqhead;
f24e9980
SW		 1035
1036 dout("send_request %p tid %llu to osd%d flags %d\n",
1037 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1038
1039 reqhead = req->r_request->front.iov_base;
1040 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1041 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1042 reqhead->reassert_version = req->r_reassert_version;
1043
3dd72fc0 1044 req->r_stamp = jiffies;
07a27e22 1045 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
f24e9980
SW		 1046
1047 ceph_msg_get(req->r_request); /* send consumes a ref */
1048 ceph_con_send(&req->r_osd->o_con, req->r_request);
1049 req->r_sent = req->r_osd->o_incarnation;
f24e9980
SW		 1050}
1051
6f6c7006
SW		 1052/*
1053 * Send any requests in the queue (req_unsent).
1054 */
1055static void send_queued(struct ceph_osd_client *osdc)
1056{
1057 struct ceph_osd_request *req, *tmp;
1058
1059 dout("send_queued\n");
1060 mutex_lock(&osdc->request_mutex);
1061 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1062 __send_request(osdc, req);
1063 }
1064 mutex_unlock(&osdc->request_mutex);
1065}
1066
f24e9980
SW		 1067/*
1068 * Timeout callback, called every N seconds when 1 or more osd
1069 * requests has been active for more than N seconds. When this
1070 * happens, we ping all OSDs with requests who have timed out to
1071 * ensure any communications channel reset is detected. Reset the
1072 * request timeouts another N seconds in the future as we go.
1073 * Reschedule the timeout event another N seconds in future (unless
1074 * there are no open requests).
1075 */
1076static void handle_timeout(struct work_struct *work)
1077{
1078 struct ceph_osd_client *osdc =
1079 container_of(work, struct ceph_osd_client, timeout_work.work);
422d2cb8 1080 struct ceph_osd_request *req, *last_req = NULL;
f24e9980 1081 struct ceph_osd *osd;
3d14c5d2 1082 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
422d2cb8 1083 unsigned long keepalive =
3d14c5d2 1084 osdc->client->options->osd_keepalive_timeout * HZ;
3dd72fc0 1085 unsigned long last_stamp = 0;
422d2cb8 1086 struct list_head slow_osds;
f24e9980
SW		 1087 dout("timeout\n");
1088 down_read(&osdc->map_sem);
1089
1090 ceph_monc_request_next_osdmap(&osdc->client->monc);
1091
1092 mutex_lock(&osdc->request_mutex);
f24e9980 1093
422d2cb8
YS		 1094 /*
1095 * reset osds that appear to be _really_ unresponsive. this
1096 * is a failsafe measure.. we really shouldn't be getting to
1097 * this point if the system is working properly. the monitors
1098 * should mark the osd as failed and we should find out about
1099 * it from an updated osd map.
1100 */
f26e681d 1101 while (timeout && !list_empty(&osdc->req_lru)) {
422d2cb8
YS		 1102 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1103 r_req_lru_item);
1104
4cf9d544 1105 /* hasn't been long enough since we sent it? */
3dd72fc0 1106 if (time_before(jiffies, req->r_stamp + timeout))
422d2cb8 1107 break;
4cf9d544
SW		 1108
1109 /* hasn't been long enough since it was acked? */
1110 if (req->r_request->ack_stamp == 0 ||
1111 time_before(jiffies, req->r_request->ack_stamp + timeout))
1112 break;
422d2cb8 1113
3dd72fc0 1114 BUG_ON(req == last_req && req->r_stamp == last_stamp);
422d2cb8 1115 last_req = req;
3dd72fc0 1116 last_stamp = req->r_stamp;
422d2cb8
YS		 1117
1118 osd = req->r_osd;
1119 BUG_ON(!osd);
1120 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1121 req->r_tid, osd->o_osd);
6f6c7006 1122 __kick_osd_requests(osdc, osd);
422d2cb8
YS		 1123 }
1124
1125 /*
1126 * ping osds that are a bit slow. this ensures that if there
1127 * is a break in the TCP connection we will notice, and reopen
1128 * a connection with that osd (from the fault callback).
1129 */
1130 INIT_LIST_HEAD(&slow_osds);
1131 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
3dd72fc0 1132 if (time_before(jiffies, req->r_stamp + keepalive))
422d2cb8
YS		 1133 break;
1134
1135 osd = req->r_osd;
1136 BUG_ON(!osd);
1137 dout(" tid %llu is slow, will send keepalive on osd%d\n",
f24e9980 1138 req->r_tid, osd->o_osd);
422d2cb8
YS		 1139 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1140 }
1141 while (!list_empty(&slow_osds)) {
1142 osd = list_entry(slow_osds.next, struct ceph_osd,
1143 o_keepalive_item);
1144 list_del_init(&osd->o_keepalive_item);
f24e9980
SW		 1145 ceph_con_keepalive(&osd->o_con);
1146 }
1147
422d2cb8 1148 __schedule_osd_timeout(osdc);
f24e9980 1149 mutex_unlock(&osdc->request_mutex);
6f6c7006 1150 send_queued(osdc);
f24e9980
SW		 1151 up_read(&osdc->map_sem);
1152}
1153
f5a2041b
YS		 1154static void handle_osds_timeout(struct work_struct *work)
1155{
1156 struct ceph_osd_client *osdc =
1157 container_of(work, struct ceph_osd_client,
1158 osds_timeout_work.work);
1159 unsigned long delay =
3d14c5d2 1160 osdc->client->options->osd_idle_ttl * HZ >> 2;
f5a2041b
YS		 1161
1162 dout("osds timeout\n");
1163 down_read(&osdc->map_sem);
aca420bc 1164 remove_old_osds(osdc);
f5a2041b
YS		 1165 up_read(&osdc->map_sem);
1166
1167 schedule_delayed_work(&osdc->osds_timeout_work,
1168 round_jiffies_relative(delay));
1169}
1170
25845472
SW		 1171static void complete_request(struct ceph_osd_request *req)
1172{
1173 if (req->r_safe_callback)
1174 req->r_safe_callback(req, NULL);
1175 complete_all(&req->r_safe_completion); /* fsync waiter */
1176}
1177
f24e9980
SW		 1178/*
1179 * handle osd op reply. either call the callback if it is specified,
1180 * or do the completion to wake up the waiting thread.
1181 */
350b1c32
SW		 1182static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1183 struct ceph_connection *con)
f24e9980
SW		 1184{
1185 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1186 struct ceph_osd_request *req;
1187 u64 tid;
1188 int numops, object_len, flags;
0ceed5db 1189 s32 result;
f24e9980 1190
6df058c0 1191 tid = le64_to_cpu(msg->hdr.tid);
f24e9980
SW		 1192 if (msg->front.iov_len < sizeof(*rhead))
1193 goto bad;
f24e9980
SW		 1194 numops = le32_to_cpu(rhead->num_ops);
1195 object_len = le32_to_cpu(rhead->object_len);
0ceed5db 1196 result = le32_to_cpu(rhead->result);
f24e9980
SW		 1197 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1198 numops * sizeof(struct ceph_osd_op))
1199 goto bad;
0ceed5db 1200 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
f24e9980
SW		 1201 /* lookup */
1202 mutex_lock(&osdc->request_mutex);
1203 req = __lookup_request(osdc, tid);
1204 if (req == NULL) {
1205 dout("handle_reply tid %llu dne\n", tid);
1206 mutex_unlock(&osdc->request_mutex);
1207 return;
1208 }
1209 ceph_osdc_get_request(req);
1210 flags = le32_to_cpu(rhead->flags);
1211
350b1c32 1212 /*
0d59ab81 1213 * if this connection filled our message, drop our reference now, to
350b1c32
SW		 1214 * avoid a (safe but slower) revoke later.
1215 */
0d59ab81 1216 if (req->r_con_filling_msg == con && req->r_reply == msg) {
c16e7869 1217 dout(" dropping con_filling_msg ref %p\n", con);
0d59ab81 1218 req->r_con_filling_msg = NULL;
350b1c32
SW		 1219 ceph_con_put(con);
1220 }
1221
f24e9980
SW		 1222 if (!req->r_got_reply) {
1223 unsigned bytes;
1224
1225 req->r_result = le32_to_cpu(rhead->result);
1226 bytes = le32_to_cpu(msg->hdr.data_len);
1227 dout("handle_reply result %d bytes %d\n", req->r_result,
1228 bytes);
1229 if (req->r_result == 0)
1230 req->r_result = bytes;
1231
1232 /* in case this is a write and we need to replay, */
1233 req->r_reassert_version = rhead->reassert_version;
1234
1235 req->r_got_reply = 1;
1236 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1237 dout("handle_reply tid %llu dup ack\n", tid);
34b43a56 1238 mutex_unlock(&osdc->request_mutex);
f24e9980
SW		 1239 goto done;
1240 }
1241
1242 dout("handle_reply tid %llu flags %d\n", tid, flags);
1243
a40c4f10
YS		 1244 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1245 __register_linger_request(osdc, req);
1246
f24e9980 1247 /* either this is a read, or we got the safe response */
0ceed5db
SW		 1248 if (result < 0 ||
1249 (flags & CEPH_OSD_FLAG_ONDISK) ||
f24e9980
SW		 1250 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1251 __unregister_request(osdc, req);
1252
1253 mutex_unlock(&osdc->request_mutex);
1254
1255 if (req->r_callback)
1256 req->r_callback(req, msg);
1257 else
03066f23 1258 complete_all(&req->r_completion);
f24e9980 1259
25845472
SW		 1260 if (flags & CEPH_OSD_FLAG_ONDISK)
1261 complete_request(req);
f24e9980
SW		 1262
1263done:
a40c4f10 1264 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
f24e9980
SW		 1265 ceph_osdc_put_request(req);
1266 return;
1267
1268bad:
1269 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1270 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1271 (int)sizeof(*rhead));
9ec7cab1 1272 ceph_msg_dump(msg);
f24e9980
SW		 1273}
1274
6f6c7006 1275static void reset_changed_osds(struct ceph_osd_client *osdc)
f24e9980 1276{
f24e9980 1277 struct rb_node *p, *n;
f24e9980 1278
6f6c7006
SW		 1279 for (p = rb_first(&osdc->osds); p; p = n) {
1280 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
f24e9980 1281
6f6c7006
SW		 1282 n = rb_next(p);
1283 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1284 memcmp(&osd->o_con.peer_addr,
1285 ceph_osd_addr(osdc->osdmap,
1286 osd->o_osd),
1287 sizeof(struct ceph_entity_addr)) != 0)
1288 __reset_osd(osdc, osd);
f24e9980 1289 }
422d2cb8
YS		 1290}
1291
1292/*
6f6c7006
SW		 1293 * Requeue requests whose mapping to an OSD has changed. If requests map to
1294 * no osd, request a new map.
422d2cb8
YS		 1295 *
1296 * Caller should hold map_sem for read and request_mutex.
1297 */
38d6453c 1298static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
422d2cb8 1299{
a40c4f10 1300 struct ceph_osd_request *req, *nreq;
6f6c7006
SW		 1301 struct rb_node *p;
1302 int needmap = 0;
1303 int err;
422d2cb8 1304
38d6453c 1305 dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
422d2cb8 1306 mutex_lock(&osdc->request_mutex);
6f6c7006
SW		 1307 for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
1308 req = rb_entry(p, struct ceph_osd_request, r_node);
38d6453c 1309 err = __map_request(osdc, req, force_resend);
6f6c7006
SW		 1310 if (err < 0)
1311 continue; /* error */
1312 if (req->r_osd == NULL) {
1313 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1314 needmap++; /* request a newer map */
1315 } else if (err > 0) {
1316 dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
1317 req->r_osd ? req->r_osd->o_osd : -1);
a40c4f10
YS		 1318 if (!req->r_linger)
1319 req->r_flags |= CEPH_OSD_FLAG_RETRY;
1320 }
1321 }
1322
1323 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1324 r_linger_item) {
1325 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1326
38d6453c 1327 err = __map_request(osdc, req, force_resend);
a40c4f10
YS		 1328 if (err == 0)
1329 continue; /* no change and no osd was specified */
1330 if (err < 0)
1331 continue; /* hrm! */
1332 if (req->r_osd == NULL) {
1333 dout("tid %llu maps to no valid osd\n", req->r_tid);
1334 needmap++; /* request a newer map */
1335 continue;
6f6c7006 1336 }
a40c4f10
YS		 1337
1338 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1339 req->r_osd ? req->r_osd->o_osd : -1);
1340 __unregister_linger_request(osdc, req);
1341 __register_request(osdc, req);
6f6c7006 1342 }
f24e9980
SW		 1343 mutex_unlock(&osdc->request_mutex);
1344
1345 if (needmap) {
1346 dout("%d requests for down osds, need new map\n", needmap);
1347 ceph_monc_request_next_osdmap(&osdc->client->monc);
1348 }
422d2cb8 1349}
6f6c7006
SW		 1350
1351
f24e9980
SW		 1352/*
1353 * Process updated osd map.
1354 *
1355 * The message contains any number of incremental and full maps, normally
1356 * indicating some sort of topology change in the cluster. Kick requests
1357 * off to different OSDs as needed.
1358 */
1359void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1360{
1361 void *p, *end, *next;
1362 u32 nr_maps, maplen;
1363 u32 epoch;
1364 struct ceph_osdmap *newmap = NULL, *oldmap;
1365 int err;
1366 struct ceph_fsid fsid;
1367
1368 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1369 p = msg->front.iov_base;
1370 end = p + msg->front.iov_len;
1371
1372 /* verify fsid */
1373 ceph_decode_need(&p, end, sizeof(fsid), bad);
1374 ceph_decode_copy(&p, &fsid, sizeof(fsid));
0743304d
SW		 1375 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1376 return;
f24e9980
SW		 1377
1378 down_write(&osdc->map_sem);
1379
1380 /* incremental maps */
1381 ceph_decode_32_safe(&p, end, nr_maps, bad);
1382 dout(" %d inc maps\n", nr_maps);
1383 while (nr_maps > 0) {
1384 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 1385 epoch = ceph_decode_32(&p);
1386 maplen = ceph_decode_32(&p);
f24e9980
SW		 1387 ceph_decode_need(&p, end, maplen, bad);
1388 next = p + maplen;
1389 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1390 dout("applying incremental map %u len %d\n",
1391 epoch, maplen);
1392 newmap = osdmap_apply_incremental(&p, next,
1393 osdc->osdmap,
15d9882c 1394 &osdc->client->msgr);
f24e9980
SW		 1395 if (IS_ERR(newmap)) {
1396 err = PTR_ERR(newmap);
1397 goto bad;
1398 }
30dc6381 1399 BUG_ON(!newmap);
f24e9980
SW		 1400 if (newmap != osdc->osdmap) {
1401 ceph_osdmap_destroy(osdc->osdmap);
1402 osdc->osdmap = newmap;
1403 }
38d6453c 1404 kick_requests(osdc, 0);
6f6c7006 1405 reset_changed_osds(osdc);
f24e9980
SW		 1406 } else {
1407 dout("ignoring incremental map %u len %d\n",
1408 epoch, maplen);
1409 }
1410 p = next;
1411 nr_maps--;
1412 }
1413 if (newmap)
1414 goto done;
1415
1416 /* full maps */
1417 ceph_decode_32_safe(&p, end, nr_maps, bad);
1418 dout(" %d full maps\n", nr_maps);
1419 while (nr_maps) {
1420 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 1421 epoch = ceph_decode_32(&p);
1422 maplen = ceph_decode_32(&p);
f24e9980
SW		 1423 ceph_decode_need(&p, end, maplen, bad);
1424 if (nr_maps > 1) {
1425 dout("skipping non-latest full map %u len %d\n",
1426 epoch, maplen);
1427 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1428 dout("skipping full map %u len %d, "
1429 "older than our %u\n", epoch, maplen,
1430 osdc->osdmap->epoch);
1431 } else {
38d6453c
SW		 1432 int skipped_map = 0;
1433
f24e9980
SW		 1434 dout("taking full map %u len %d\n", epoch, maplen);
1435 newmap = osdmap_decode(&p, p+maplen);
1436 if (IS_ERR(newmap)) {
1437 err = PTR_ERR(newmap);
1438 goto bad;
1439 }
30dc6381 1440 BUG_ON(!newmap);
f24e9980
SW		 1441 oldmap = osdc->osdmap;
1442 osdc->osdmap = newmap;
38d6453c
SW		 1443 if (oldmap) {
1444 if (oldmap->epoch + 1 < newmap->epoch)
1445 skipped_map = 1;
f24e9980 1446 ceph_osdmap_destroy(oldmap);
38d6453c
SW		 1447 }
1448 kick_requests(osdc, skipped_map);
f24e9980
SW		 1449 }
1450 p += maplen;
1451 nr_maps--;
1452 }
1453
1454done:
1455 downgrade_write(&osdc->map_sem);
1456 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
cd634fb6
SW		 1457
1458 /*
1459 * subscribe to subsequent osdmap updates if full to ensure
1460 * we find out when we are no longer full and stop returning
1461 * ENOSPC.
1462 */
1463 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1464 ceph_monc_request_next_osdmap(&osdc->client->monc);
1465
6f6c7006 1466 send_queued(osdc);
f24e9980 1467 up_read(&osdc->map_sem);
03066f23 1468 wake_up_all(&osdc->client->auth_wq);
f24e9980
SW		 1469 return;
1470
1471bad:
1472 pr_err("osdc handle_map corrupt msg\n");
9ec7cab1 1473 ceph_msg_dump(msg);
f24e9980
SW		 1474 up_write(&osdc->map_sem);
1475 return;
1476}
1477
a40c4f10
YS		 1478/*
1479 * watch/notify callback event infrastructure
1480 *
1481 * These callbacks are used both for watch and notify operations.
1482 */
1483static void __release_event(struct kref *kref)
1484{
1485 struct ceph_osd_event *event =
1486 container_of(kref, struct ceph_osd_event, kref);
1487
1488 dout("__release_event %p\n", event);
1489 kfree(event);
1490}
1491
1492static void get_event(struct ceph_osd_event *event)
1493{
1494 kref_get(&event->kref);
1495}
1496
1497void ceph_osdc_put_event(struct ceph_osd_event *event)
1498{
1499 kref_put(&event->kref, __release_event);
1500}
1501EXPORT_SYMBOL(ceph_osdc_put_event);
1502
1503static void __insert_event(struct ceph_osd_client *osdc,
1504 struct ceph_osd_event *new)
1505{
1506 struct rb_node **p = &osdc->event_tree.rb_node;
1507 struct rb_node *parent = NULL;
1508 struct ceph_osd_event *event = NULL;
1509
1510 while (*p) {
1511 parent = *p;
1512 event = rb_entry(parent, struct ceph_osd_event, node);
1513 if (new->cookie < event->cookie)
1514 p = &(*p)->rb_left;
1515 else if (new->cookie > event->cookie)
1516 p = &(*p)->rb_right;
1517 else
1518 BUG();
1519 }
1520
1521 rb_link_node(&new->node, parent, p);
1522 rb_insert_color(&new->node, &osdc->event_tree);
1523}
1524
1525static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1526 u64 cookie)
1527{
1528 struct rb_node **p = &osdc->event_tree.rb_node;
1529 struct rb_node *parent = NULL;
1530 struct ceph_osd_event *event = NULL;
1531
1532 while (*p) {
1533 parent = *p;
1534 event = rb_entry(parent, struct ceph_osd_event, node);
1535 if (cookie < event->cookie)
1536 p = &(*p)->rb_left;
1537 else if (cookie > event->cookie)
1538 p = &(*p)->rb_right;
1539 else
1540 return event;
1541 }
1542 return NULL;
1543}
1544
1545static void __remove_event(struct ceph_osd_event *event)
1546{
1547 struct ceph_osd_client *osdc = event->osdc;
1548
1549 if (!RB_EMPTY_NODE(&event->node)) {
1550 dout("__remove_event removed %p\n", event);
1551 rb_erase(&event->node, &osdc->event_tree);
1552 ceph_osdc_put_event(event);
1553 } else {
1554 dout("__remove_event didn't remove %p\n", event);
1555 }
1556}
1557
1558int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1559 void (*event_cb)(u64, u64, u8, void *),
1560 int one_shot, void *data,
1561 struct ceph_osd_event **pevent)
1562{
1563 struct ceph_osd_event *event;
1564
1565 event = kmalloc(sizeof(*event), GFP_NOIO);
1566 if (!event)
1567 return -ENOMEM;
1568
1569 dout("create_event %p\n", event);
1570 event->cb = event_cb;
1571 event->one_shot = one_shot;
1572 event->data = data;
1573 event->osdc = osdc;
1574 INIT_LIST_HEAD(&event->osd_node);
1575 kref_init(&event->kref); /* one ref for us */
1576 kref_get(&event->kref); /* one ref for the caller */
1577 init_completion(&event->completion);
1578
1579 spin_lock(&osdc->event_lock);
1580 event->cookie = ++osdc->event_count;
1581 __insert_event(osdc, event);
1582 spin_unlock(&osdc->event_lock);
1583
1584 *pevent = event;
1585 return 0;
1586}
1587EXPORT_SYMBOL(ceph_osdc_create_event);
1588
1589void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1590{
1591 struct ceph_osd_client *osdc = event->osdc;
1592
1593 dout("cancel_event %p\n", event);
1594 spin_lock(&osdc->event_lock);
1595 __remove_event(event);
1596 spin_unlock(&osdc->event_lock);
1597 ceph_osdc_put_event(event); /* caller's */
1598}
1599EXPORT_SYMBOL(ceph_osdc_cancel_event);
1600
1601
1602static void do_event_work(struct work_struct *work)
1603{
1604 struct ceph_osd_event_work *event_work =
1605 container_of(work, struct ceph_osd_event_work, work);
1606 struct ceph_osd_event *event = event_work->event;
1607 u64 ver = event_work->ver;
1608 u64 notify_id = event_work->notify_id;
1609 u8 opcode = event_work->opcode;
1610
1611 dout("do_event_work completing %p\n", event);
1612 event->cb(ver, notify_id, opcode, event->data);
1613 complete(&event->completion);
1614 dout("do_event_work completed %p\n", event);
1615 ceph_osdc_put_event(event);
1616 kfree(event_work);
1617}
1618
1619
1620/*
1621 * Process osd watch notifications
1622 */
1623void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1624{
1625 void *p, *end;
1626 u8 proto_ver;
1627 u64 cookie, ver, notify_id;
1628 u8 opcode;
1629 struct ceph_osd_event *event;
1630 struct ceph_osd_event_work *event_work;
1631
1632 p = msg->front.iov_base;
1633 end = p + msg->front.iov_len;
1634
1635 ceph_decode_8_safe(&p, end, proto_ver, bad);
1636 ceph_decode_8_safe(&p, end, opcode, bad);
1637 ceph_decode_64_safe(&p, end, cookie, bad);
1638 ceph_decode_64_safe(&p, end, ver, bad);
1639 ceph_decode_64_safe(&p, end, notify_id, bad);
1640
1641 spin_lock(&osdc->event_lock);
1642 event = __find_event(osdc, cookie);
1643 if (event) {
1644 get_event(event);
1645 if (event->one_shot)
1646 __remove_event(event);
1647 }
1648 spin_unlock(&osdc->event_lock);
1649 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1650 cookie, ver, event);
1651 if (event) {
1652 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
a40c4f10
YS		 1653 if (!event_work) {
1654 dout("ERROR: could not allocate event_work\n");
1655 goto done_err;
1656 }
6b0ae409 1657 INIT_WORK(&event_work->work, do_event_work);
a40c4f10
YS		 1658 event_work->event = event;
1659 event_work->ver = ver;
1660 event_work->notify_id = notify_id;
1661 event_work->opcode = opcode;
1662 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1663 dout("WARNING: failed to queue notify event work\n");
1664 goto done_err;
1665 }
1666 }
1667
1668 return;
1669
1670done_err:
1671 complete(&event->completion);
1672 ceph_osdc_put_event(event);
1673 return;
1674
1675bad:
1676 pr_err("osdc handle_watch_notify corrupt msg\n");
1677 return;
1678}
1679
1680int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1681{
1682 int err;
1683
1684 dout("wait_event %p\n", event);
1685 err = wait_for_completion_interruptible_timeout(&event->completion,
1686 timeout * HZ);
1687 ceph_osdc_put_event(event);
1688 if (err > 0)
1689 err = 0;
1690 dout("wait_event %p returns %d\n", event, err);
1691 return err;
1692}
1693EXPORT_SYMBOL(ceph_osdc_wait_event);
1694
f24e9980
SW		 1695/*
1696 * Register request, send initial attempt.
1697 */
1698int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1699 struct ceph_osd_request *req,
1700 bool nofail)
1701{
c1ea8823 1702 int rc = 0;
f24e9980
SW		 1703
1704 req->r_request->pages = req->r_pages;
1705 req->r_request->nr_pages = req->r_num_pages;
68b4476b
YS		 1706#ifdef CONFIG_BLOCK
1707 req->r_request->bio = req->r_bio;
1708#endif
1709 req->r_request->trail = req->r_trail;
f24e9980
SW		 1710
1711 register_request(osdc, req);
1712
1713 down_read(&osdc->map_sem);
1714 mutex_lock(&osdc->request_mutex);
c1ea8823
SW		 1715 /*
1716 * a racing kick_requests() may have sent the message for us
1717 * while we dropped request_mutex above, so only send now if
1718 * the request still han't been touched yet.
1719 */
1720 if (req->r_sent == 0) {
38d6453c 1721 rc = __map_request(osdc, req, 0);
9d6fcb08
SW		 1722 if (rc < 0) {
1723 if (nofail) {
1724 dout("osdc_start_request failed map, "
1725 " will retry %lld\n", req->r_tid);
1726 rc = 0;
1727 }
234af26f 1728 goto out_unlock;
9d6fcb08 1729 }
6f6c7006
SW		 1730 if (req->r_osd == NULL) {
1731 dout("send_request %p no up osds in pg\n", req);
1732 ceph_monc_request_next_osdmap(&osdc->client->monc);
1733 } else {
56e925b6 1734 __send_request(osdc, req);
f24e9980 1735 }
56e925b6 1736 rc = 0;
f24e9980 1737 }
234af26f
DC		 1738
1739out_unlock:
f24e9980
SW		 1740 mutex_unlock(&osdc->request_mutex);
1741 up_read(&osdc->map_sem);
1742 return rc;
1743}
3d14c5d2 1744EXPORT_SYMBOL(ceph_osdc_start_request);
f24e9980
SW		 1745
1746/*
1747 * wait for a request to complete
1748 */
1749int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1750 struct ceph_osd_request *req)
1751{
1752 int rc;
1753
1754 rc = wait_for_completion_interruptible(&req->r_completion);
1755 if (rc < 0) {
1756 mutex_lock(&osdc->request_mutex);
1757 __cancel_request(req);
529cfcc4 1758 __unregister_request(osdc, req);
f24e9980 1759 mutex_unlock(&osdc->request_mutex);
25845472 1760 complete_request(req);
529cfcc4 1761 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
f24e9980
SW		 1762 return rc;
1763 }
1764
1765 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1766 return req->r_result;
1767}
3d14c5d2 1768EXPORT_SYMBOL(ceph_osdc_wait_request);
f24e9980
SW		 1769
1770/*
1771 * sync - wait for all in-flight requests to flush. avoid starvation.
1772 */
1773void ceph_osdc_sync(struct ceph_osd_client *osdc)
1774{
1775 struct ceph_osd_request *req;
1776 u64 last_tid, next_tid = 0;
1777
1778 mutex_lock(&osdc->request_mutex);
1779 last_tid = osdc->last_tid;
1780 while (1) {
1781 req = __lookup_request_ge(osdc, next_tid);
1782 if (!req)
1783 break;
1784 if (req->r_tid > last_tid)
1785 break;
1786
1787 next_tid = req->r_tid + 1;
1788 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1789 continue;
1790
1791 ceph_osdc_get_request(req);
1792 mutex_unlock(&osdc->request_mutex);
1793 dout("sync waiting on tid %llu (last is %llu)\n",
1794 req->r_tid, last_tid);
1795 wait_for_completion(&req->r_safe_completion);
1796 mutex_lock(&osdc->request_mutex);
1797 ceph_osdc_put_request(req);
1798 }
1799 mutex_unlock(&osdc->request_mutex);
1800 dout("sync done (thru tid %llu)\n", last_tid);
1801}
3d14c5d2 1802EXPORT_SYMBOL(ceph_osdc_sync);
f24e9980
SW		 1803
1804/*
1805 * init, shutdown
1806 */
1807int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1808{
1809 int err;
1810
1811 dout("init\n");
1812 osdc->client = client;
1813 osdc->osdmap = NULL;
1814 init_rwsem(&osdc->map_sem);
1815 init_completion(&osdc->map_waiters);
1816 osdc->last_requested_map = 0;
1817 mutex_init(&osdc->request_mutex);
f24e9980
SW		 1818 osdc->last_tid = 0;
1819 osdc->osds = RB_ROOT;
f5a2041b 1820 INIT_LIST_HEAD(&osdc->osd_lru);
f24e9980 1821 osdc->requests = RB_ROOT;
422d2cb8 1822 INIT_LIST_HEAD(&osdc->req_lru);
6f6c7006
SW		 1823 INIT_LIST_HEAD(&osdc->req_unsent);
1824 INIT_LIST_HEAD(&osdc->req_notarget);
a40c4f10 1825 INIT_LIST_HEAD(&osdc->req_linger);
f24e9980
SW		 1826 osdc->num_requests = 0;
1827 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
f5a2041b 1828 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
a40c4f10
YS		 1829 spin_lock_init(&osdc->event_lock);
1830 osdc->event_tree = RB_ROOT;
1831 osdc->event_count = 0;
f5a2041b
YS		 1832
1833 schedule_delayed_work(&osdc->osds_timeout_work,
3d14c5d2 1834 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
f24e9980 1835
5f44f142 1836 err = -ENOMEM;
f24e9980
SW		 1837 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1838 sizeof(struct ceph_osd_request));
1839 if (!osdc->req_mempool)
5f44f142 1840 goto out;
f24e9980 1841
4f48280e
SW		 1842 err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true,
1843 "osd_op");
f24e9980 1844 if (err < 0)
5f44f142 1845 goto out_mempool;
c16e7869 1846 err = ceph_msgpool_init(&osdc->msgpool_op_reply,
4f48280e
SW		 1847 OSD_OPREPLY_FRONT_LEN, 10, true,
1848 "osd_op_reply");
c16e7869
SW		 1849 if (err < 0)
1850 goto out_msgpool;
a40c4f10
YS		 1851
1852 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1853 if (IS_ERR(osdc->notify_wq)) {
1854 err = PTR_ERR(osdc->notify_wq);
1855 osdc->notify_wq = NULL;
1856 goto out_msgpool;
1857 }
f24e9980 1858 return 0;
5f44f142 1859
c16e7869
SW		 1860out_msgpool:
1861 ceph_msgpool_destroy(&osdc->msgpool_op);
5f44f142
SW		 1862out_mempool:
1863 mempool_destroy(osdc->req_mempool);
1864out:
1865 return err;
f24e9980 1866}
3d14c5d2 1867EXPORT_SYMBOL(ceph_osdc_init);
f24e9980
SW		 1868
1869void ceph_osdc_stop(struct ceph_osd_client *osdc)
1870{
a40c4f10
YS		 1871 flush_workqueue(osdc->notify_wq);
1872 destroy_workqueue(osdc->notify_wq);
f24e9980 1873 cancel_delayed_work_sync(&osdc->timeout_work);
f5a2041b 1874 cancel_delayed_work_sync(&osdc->osds_timeout_work);
f24e9980
SW		 1875 if (osdc->osdmap) {
1876 ceph_osdmap_destroy(osdc->osdmap);
1877 osdc->osdmap = NULL;
1878 }
aca420bc 1879 remove_all_osds(osdc);
f24e9980
SW		 1880 mempool_destroy(osdc->req_mempool);
1881 ceph_msgpool_destroy(&osdc->msgpool_op);
c16e7869 1882 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
f24e9980 1883}
3d14c5d2 1884EXPORT_SYMBOL(ceph_osdc_stop);
f24e9980
SW		 1885
1886/*
1887 * Read some contiguous pages. If we cross a stripe boundary, shorten
1888 * *plen. Return number of bytes read, or error.
1889 */
1890int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1891 struct ceph_vino vino, struct ceph_file_layout *layout,
1892 u64 off, u64 *plen,
1893 u32 truncate_seq, u64 truncate_size,
b7495fc2 1894 struct page **pages, int num_pages, int page_align)
f24e9980
SW		 1895{
1896 struct ceph_osd_request *req;
1897 int rc = 0;
1898
1899 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1900 vino.snap, off, *plen);
1901 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1902 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1903 NULL, 0, truncate_seq, truncate_size, NULL,
b7495fc2 1904 false, 1, page_align);
a79832f2
SW		 1905 if (!req)
1906 return -ENOMEM;
f24e9980
SW		 1907
1908 /* it may be a short read due to an object boundary */
1909 req->r_pages = pages;
f24e9980 1910
b7495fc2
SW		 1911 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1912 off, *plen, req->r_num_pages, page_align);
f24e9980
SW		 1913
1914 rc = ceph_osdc_start_request(osdc, req, false);
1915 if (!rc)
1916 rc = ceph_osdc_wait_request(osdc, req);
1917
1918 ceph_osdc_put_request(req);
1919 dout("readpages result %d\n", rc);
1920 return rc;
1921}
3d14c5d2 1922EXPORT_SYMBOL(ceph_osdc_readpages);
f24e9980
SW		 1923
1924/*
1925 * do a synchronous write on N pages
1926 */
1927int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1928 struct ceph_file_layout *layout,
1929 struct ceph_snap_context *snapc,
1930 u64 off, u64 len,
1931 u32 truncate_seq, u64 truncate_size,
1932 struct timespec *mtime,
1933 struct page **pages, int num_pages,
1934 int flags, int do_sync, bool nofail)
1935{
1936 struct ceph_osd_request *req;
1937 int rc = 0;
b7495fc2 1938 int page_align = off & ~PAGE_MASK;
f24e9980
SW		 1939
1940 BUG_ON(vino.snap != CEPH_NOSNAP);
1941 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1942 CEPH_OSD_OP_WRITE,
1943 flags | CEPH_OSD_FLAG_ONDISK |
1944 CEPH_OSD_FLAG_WRITE,
1945 snapc, do_sync,
1946 truncate_seq, truncate_size, mtime,
b7495fc2 1947 nofail, 1, page_align);
a79832f2
SW		 1948 if (!req)
1949 return -ENOMEM;
f24e9980
SW		 1950
1951 /* it may be a short write due to an object boundary */
1952 req->r_pages = pages;
f24e9980
SW		 1953 dout("writepages %llu~%llu (%d pages)\n", off, len,
1954 req->r_num_pages);
1955
1956 rc = ceph_osdc_start_request(osdc, req, nofail);
1957 if (!rc)
1958 rc = ceph_osdc_wait_request(osdc, req);
1959
1960 ceph_osdc_put_request(req);
1961 if (rc == 0)
1962 rc = len;
1963 dout("writepages result %d\n", rc);
1964 return rc;
1965}
3d14c5d2 1966EXPORT_SYMBOL(ceph_osdc_writepages);
f24e9980
SW		 1967
1968/*
1969 * handle incoming message
1970 */
1971static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1972{
1973 struct ceph_osd *osd = con->private;
32c895e7 1974 struct ceph_osd_client *osdc;
f24e9980
SW		 1975 int type = le16_to_cpu(msg->hdr.type);
1976
1977 if (!osd)
4a32f93d 1978 goto out;
32c895e7 1979 osdc = osd->o_osdc;
f24e9980
SW		 1980
1981 switch (type) {
1982 case CEPH_MSG_OSD_MAP:
1983 ceph_osdc_handle_map(osdc, msg);
1984 break;
1985 case CEPH_MSG_OSD_OPREPLY:
350b1c32 1986 handle_reply(osdc, msg, con);
f24e9980 1987 break;
a40c4f10
YS		 1988 case CEPH_MSG_WATCH_NOTIFY:
1989 handle_watch_notify(osdc, msg);
1990 break;
f24e9980
SW		 1991
1992 default:
1993 pr_err("received unknown message type %d %s\n", type,
1994 ceph_msg_type_name(type));
1995 }
4a32f93d 1996out:
f24e9980
SW		 1997 ceph_msg_put(msg);
1998}
1999
5b3a4db3 2000/*
21b667f6
SW		 2001 * lookup and return message for incoming reply. set up reply message
2002 * pages.
5b3a4db3
SW		 2003 */
2004static struct ceph_msg *get_reply(struct ceph_connection *con,
2450418c
YS		 2005 struct ceph_msg_header *hdr,
2006 int *skip)
f24e9980
SW		 2007{
2008 struct ceph_osd *osd = con->private;
2009 struct ceph_osd_client *osdc = osd->o_osdc;
2450418c 2010 struct ceph_msg *m;
0547a9b3 2011 struct ceph_osd_request *req;
5b3a4db3
SW		 2012 int front = le32_to_cpu(hdr->front_len);
2013 int data_len = le32_to_cpu(hdr->data_len);
0547a9b3 2014 u64 tid;
f24e9980 2015
0547a9b3
YS		 2016 tid = le64_to_cpu(hdr->tid);
2017 mutex_lock(&osdc->request_mutex);
2018 req = __lookup_request(osdc, tid);
2019 if (!req) {
2020 *skip = 1;
2021 m = NULL;
c16e7869 2022 pr_info("get_reply unknown tid %llu from osd%d\n", tid,
5b3a4db3 2023 osd->o_osd);
0547a9b3
YS		 2024 goto out;
2025 }
c16e7869
SW		 2026
2027 if (req->r_con_filling_msg) {
2028 dout("get_reply revoking msg %p from old con %p\n",
2029 req->r_reply, req->r_con_filling_msg);
2030 ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply);
2031 ceph_con_put(req->r_con_filling_msg);
6f46cb29 2032 req->r_con_filling_msg = NULL;
0547a9b3
YS		 2033 }
2034
c16e7869
SW		 2035 if (front > req->r_reply->front.iov_len) {
2036 pr_warning("get_reply front %d > preallocated %d\n",
2037 front, (int)req->r_reply->front.iov_len);
b61c2763 2038 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
a79832f2 2039 if (!m)
c16e7869
SW		 2040 goto out;
2041 ceph_msg_put(req->r_reply);
2042 req->r_reply = m;
2043 }
2044 m = ceph_msg_get(req->r_reply);
2045
0547a9b3 2046 if (data_len > 0) {
b7495fc2 2047 int want = calc_pages_for(req->r_page_alignment, data_len);
21b667f6
SW		 2048
2049 if (unlikely(req->r_num_pages < want)) {
9bb0ce2b
SW		 2050 pr_warning("tid %lld reply has %d bytes %d pages, we"
2051 " had only %d pages ready\n", tid, data_len,
2052 want, req->r_num_pages);
0547a9b3
YS		 2053 *skip = 1;
2054 ceph_msg_put(m);
a79832f2 2055 m = NULL;
21b667f6 2056 goto out;
0547a9b3 2057 }
21b667f6
SW		 2058 m->pages = req->r_pages;
2059 m->nr_pages = req->r_num_pages;
c5c6b19d 2060 m->page_alignment = req->r_page_alignment;
68b4476b
YS		 2061#ifdef CONFIG_BLOCK
2062 m->bio = req->r_bio;
2063#endif
0547a9b3 2064 }
5b3a4db3 2065 *skip = 0;
c16e7869
SW		 2066 req->r_con_filling_msg = ceph_con_get(con);
2067 dout("get_reply tid %lld %p\n", tid, m);
0547a9b3
YS		 2068
2069out:
2070 mutex_unlock(&osdc->request_mutex);
2450418c 2071 return m;
5b3a4db3
SW		 2072
2073}
2074
2075static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2076 struct ceph_msg_header *hdr,
2077 int *skip)
2078{
2079 struct ceph_osd *osd = con->private;
2080 int type = le16_to_cpu(hdr->type);
2081 int front = le32_to_cpu(hdr->front_len);
2082
2083 switch (type) {
2084 case CEPH_MSG_OSD_MAP:
a40c4f10 2085 case CEPH_MSG_WATCH_NOTIFY:
b61c2763 2086 return ceph_msg_new(type, front, GFP_NOFS, false);
5b3a4db3
SW		 2087 case CEPH_MSG_OSD_OPREPLY:
2088 return get_reply(con, hdr, skip);
2089 default:
2090 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2091 osd->o_osd);
2092 *skip = 1;
2093 return NULL;
2094 }
f24e9980
SW		 2095}
2096
2097/*
2098 * Wrappers to refcount containing ceph_osd struct
2099 */
2100static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2101{
2102 struct ceph_osd *osd = con->private;
2103 if (get_osd(osd))
2104 return con;
2105 return NULL;
2106}
2107
2108static void put_osd_con(struct ceph_connection *con)
2109{
2110 struct ceph_osd *osd = con->private;
2111 put_osd(osd);
2112}
2113
4e7a5dcd
SW		 2114/*
2115 * authentication
2116 */
a3530df3
AE		 2117/*
2118 * Note: returned pointer is the address of a structure that's
2119 * managed separately. Caller must *not* attempt to free it.
2120 */
2121static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 2122 int *proto, int force_new)
4e7a5dcd
SW		 2123{
2124 struct ceph_osd *o = con->private;
2125 struct ceph_osd_client *osdc = o->o_osdc;
2126 struct ceph_auth_client *ac = osdc->client->monc.auth;
74f1869f 2127 struct ceph_auth_handshake *auth = &o->o_auth;
4e7a5dcd 2128
74f1869f 2129 if (force_new && auth->authorizer) {
a255651d
AE		 2130 if (ac->ops && ac->ops->destroy_authorizer)
2131 ac->ops->destroy_authorizer(ac, auth->authorizer);
74f1869f
AE		 2132 auth->authorizer = NULL;
2133 }
a255651d 2134 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
a3530df3
AE		 2135 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2136 auth);
4e7a5dcd 2137 if (ret)
a3530df3 2138 return ERR_PTR(ret);
4e7a5dcd 2139 }
4e7a5dcd 2140 *proto = ac->protocol;
74f1869f 2141
a3530df3 2142 return auth;
4e7a5dcd
SW		 2143}
2144
2145
2146static int verify_authorizer_reply(struct ceph_connection *con, int len)
2147{
2148 struct ceph_osd *o = con->private;
2149 struct ceph_osd_client *osdc = o->o_osdc;
2150 struct ceph_auth_client *ac = osdc->client->monc.auth;
2151
a255651d
AE		 2152 /*
2153 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2154 * XXX which do we do: succeed or fail?
2155 */
6c4a1915 2156 return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
4e7a5dcd
SW		 2157}
2158
9bd2e6f8
SW		 2159static int invalidate_authorizer(struct ceph_connection *con)
2160{
2161 struct ceph_osd *o = con->private;
2162 struct ceph_osd_client *osdc = o->o_osdc;
2163 struct ceph_auth_client *ac = osdc->client->monc.auth;
2164
a255651d 2165 if (ac->ops && ac->ops->invalidate_authorizer)
9bd2e6f8
SW		 2166 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2167
2168 return ceph_monc_validate_auth(&osdc->client->monc);
2169}
4e7a5dcd 2170
9e32789f 2171static const struct ceph_connection_operations osd_con_ops = {
f24e9980
SW		 2172 .get = get_osd_con,
2173 .put = put_osd_con,
2174 .dispatch = dispatch,
4e7a5dcd
SW		 2175 .get_authorizer = get_authorizer,
2176 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 2177 .invalidate_authorizer = invalidate_authorizer,
f24e9980 2178 .alloc_msg = alloc_msg,
81b024e7 2179 .fault = osd_reset,
f24e9980 2180};
Linux 6.x block layer and io_uring tree(s)