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ceph: convert to use le32_add_cpu()
[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);
0d59ab81 142 if (req->r_con_filling_msg) {
8921d114 143 dout("%s revoking pages %p from con %p\n", __func__,
0d59ab81 144 req->r_pages, req->r_con_filling_msg);
8921d114 145 ceph_msg_revoke_incoming(req->r_reply);
0d47766f 146 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
350b1c32 147 }
ab8cb34a
AE		 148 if (req->r_reply)
149 ceph_msg_put(req->r_reply);
415e49a9
SW		 150 if (req->r_own_pages)
151 ceph_release_page_vector(req->r_pages,
152 req->r_num_pages);
68b4476b
YS		 153#ifdef CONFIG_BLOCK
154 if (req->r_bio)
155 bio_put(req->r_bio);
156#endif
415e49a9 157 ceph_put_snap_context(req->r_snapc);
68b4476b
YS		 158 if (req->r_trail) {
159 ceph_pagelist_release(req->r_trail);
160 kfree(req->r_trail);
161 }
415e49a9
SW		 162 if (req->r_mempool)
163 mempool_free(req, req->r_osdc->req_mempool);
164 else
165 kfree(req);
f24e9980 166}
3d14c5d2 167EXPORT_SYMBOL(ceph_osdc_release_request);
68b4476b
YS		 168
169static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
170{
171 int i = 0;
172
173 if (needs_trail)
174 *needs_trail = 0;
175 while (ops[i].op) {
176 if (needs_trail && op_needs_trail(ops[i].op))
177 *needs_trail = 1;
178 i++;
179 }
180
181 return i;
182}
183
3499e8a5
YS		 184struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
185 int flags,
f24e9980 186 struct ceph_snap_context *snapc,
68b4476b 187 struct ceph_osd_req_op *ops,
3499e8a5
YS		 188 bool use_mempool,
189 gfp_t gfp_flags,
68b4476b
YS		 190 struct page **pages,
191 struct bio *bio)
f24e9980
SW		 192{
193 struct ceph_osd_request *req;
194 struct ceph_msg *msg;
68b4476b
YS		 195 int needs_trail;
196 int num_op = get_num_ops(ops, &needs_trail);
197 size_t msg_size = sizeof(struct ceph_osd_request_head);
3499e8a5 198
68b4476b 199 msg_size += num_op*sizeof(struct ceph_osd_op);
f24e9980
SW		 200
201 if (use_mempool) {
3499e8a5 202 req = mempool_alloc(osdc->req_mempool, gfp_flags);
f24e9980
SW		 203 memset(req, 0, sizeof(*req));
204 } else {
3499e8a5 205 req = kzalloc(sizeof(*req), gfp_flags);
f24e9980
SW		 206 }
207 if (req == NULL)
a79832f2 208 return NULL;
f24e9980 209
f24e9980
SW		 210 req->r_osdc = osdc;
211 req->r_mempool = use_mempool;
68b4476b 212
415e49a9 213 kref_init(&req->r_kref);
f24e9980
SW		 214 init_completion(&req->r_completion);
215 init_completion(&req->r_safe_completion);
cd43045c 216 rb_init_node(&req->r_node);
f24e9980 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);
cd43045c
SW		 221 INIT_LIST_HEAD(&req->r_osd_item);
222
f24e9980
SW		 223 req->r_flags = flags;
224
225 WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
226
c16e7869
SW		 227 /* create reply message */
228 if (use_mempool)
229 msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
230 else
231 msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
b61c2763 232 OSD_OPREPLY_FRONT_LEN, gfp_flags, true);
a79832f2 233 if (!msg) {
c16e7869 234 ceph_osdc_put_request(req);
a79832f2 235 return NULL;
c16e7869
SW		 236 }
237 req->r_reply = msg;
238
68b4476b
YS		 239 /* allocate space for the trailing data */
240 if (needs_trail) {
241 req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
242 if (!req->r_trail) {
243 ceph_osdc_put_request(req);
244 return NULL;
245 }
246 ceph_pagelist_init(req->r_trail);
247 }
d50b409f 248
c16e7869 249 /* create request message; allow space for oid */
224736d9 250 msg_size += MAX_OBJ_NAME_SIZE;
f24e9980
SW		 251 if (snapc)
252 msg_size += sizeof(u64) * snapc->num_snaps;
253 if (use_mempool)
8f3bc053 254 msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
f24e9980 255 else
b61c2763 256 msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags, true);
a79832f2 257 if (!msg) {
f24e9980 258 ceph_osdc_put_request(req);
a79832f2 259 return NULL;
f24e9980 260 }
68b4476b 261
f24e9980 262 memset(msg->front.iov_base, 0, msg->front.iov_len);
3499e8a5
YS		 263
264 req->r_request = msg;
265 req->r_pages = pages;
68b4476b
YS		 266#ifdef CONFIG_BLOCK
267 if (bio) {
268 req->r_bio = bio;
269 bio_get(req->r_bio);
270 }
271#endif
3499e8a5
YS		 272
273 return req;
274}
3d14c5d2 275EXPORT_SYMBOL(ceph_osdc_alloc_request);
3499e8a5 276
68b4476b
YS		 277static void osd_req_encode_op(struct ceph_osd_request *req,
278 struct ceph_osd_op *dst,
279 struct ceph_osd_req_op *src)
280{
281 dst->op = cpu_to_le16(src->op);
282
065a68f9 283 switch (src->op) {
68b4476b
YS		 284 case CEPH_OSD_OP_READ:
285 case CEPH_OSD_OP_WRITE:
286 dst->extent.offset =
287 cpu_to_le64(src->extent.offset);
288 dst->extent.length =
289 cpu_to_le64(src->extent.length);
290 dst->extent.truncate_size =
291 cpu_to_le64(src->extent.truncate_size);
292 dst->extent.truncate_seq =
293 cpu_to_le32(src->extent.truncate_seq);
294 break;
295
296 case CEPH_OSD_OP_GETXATTR:
297 case CEPH_OSD_OP_SETXATTR:
298 case CEPH_OSD_OP_CMPXATTR:
299 BUG_ON(!req->r_trail);
300
301 dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
302 dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
303 dst->xattr.cmp_op = src->xattr.cmp_op;
304 dst->xattr.cmp_mode = src->xattr.cmp_mode;
305 ceph_pagelist_append(req->r_trail, src->xattr.name,
306 src->xattr.name_len);
307 ceph_pagelist_append(req->r_trail, src->xattr.val,
308 src->xattr.value_len);
309 break;
ae1533b6
YS		 310 case CEPH_OSD_OP_CALL:
311 BUG_ON(!req->r_trail);
312
313 dst->cls.class_len = src->cls.class_len;
314 dst->cls.method_len = src->cls.method_len;
315 dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
316
317 ceph_pagelist_append(req->r_trail, src->cls.class_name,
318 src->cls.class_len);
319 ceph_pagelist_append(req->r_trail, src->cls.method_name,
320 src->cls.method_len);
321 ceph_pagelist_append(req->r_trail, src->cls.indata,
322 src->cls.indata_len);
323 break;
324 case CEPH_OSD_OP_ROLLBACK:
325 dst->snap.snapid = cpu_to_le64(src->snap.snapid);
326 break;
68b4476b
YS		 327 case CEPH_OSD_OP_STARTSYNC:
328 break;
a40c4f10
YS		 329 case CEPH_OSD_OP_NOTIFY:
330 {
331 __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
332 __le32 timeout = cpu_to_le32(src->watch.timeout);
333
334 BUG_ON(!req->r_trail);
335
336 ceph_pagelist_append(req->r_trail,
337 &prot_ver, sizeof(prot_ver));
338 ceph_pagelist_append(req->r_trail,
339 &timeout, sizeof(timeout));
340 }
341 case CEPH_OSD_OP_NOTIFY_ACK:
342 case CEPH_OSD_OP_WATCH:
343 dst->watch.cookie = cpu_to_le64(src->watch.cookie);
344 dst->watch.ver = cpu_to_le64(src->watch.ver);
345 dst->watch.flag = src->watch.flag;
346 break;
68b4476b
YS		 347 default:
348 pr_err("unrecognized osd opcode %d\n", dst->op);
349 WARN_ON(1);
350 break;
351 }
352 dst->payload_len = cpu_to_le32(src->payload_len);
353}
354
3499e8a5
YS		 355/*
356 * build new request AND message
357 *
358 */
359void ceph_osdc_build_request(struct ceph_osd_request *req,
68b4476b
YS		 360 u64 off, u64 *plen,
361 struct ceph_osd_req_op *src_ops,
362 struct ceph_snap_context *snapc,
363 struct timespec *mtime,
364 const char *oid,
365 int oid_len)
3499e8a5
YS		 366{
367 struct ceph_msg *msg = req->r_request;
368 struct ceph_osd_request_head *head;
68b4476b 369 struct ceph_osd_req_op *src_op;
3499e8a5
YS		 370 struct ceph_osd_op *op;
371 void *p;
68b4476b 372 int num_op = get_num_ops(src_ops, NULL);
3499e8a5 373 size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
3499e8a5 374 int flags = req->r_flags;
68b4476b
YS		 375 u64 data_len = 0;
376 int i;
3499e8a5 377
f24e9980
SW		 378 head = msg->front.iov_base;
379 op = (void *)(head + 1);
380 p = (void *)(op + num_op);
381
f24e9980
SW		 382 req->r_snapc = ceph_get_snap_context(snapc);
383
384 head->client_inc = cpu_to_le32(1); /* always, for now. */
385 head->flags = cpu_to_le32(flags);
386 if (flags & CEPH_OSD_FLAG_WRITE)
387 ceph_encode_timespec(&head->mtime, mtime);
388 head->num_ops = cpu_to_le16(num_op);
f24e9980 389
f24e9980
SW		 390
391 /* fill in oid */
3499e8a5
YS		 392 head->object_len = cpu_to_le32(oid_len);
393 memcpy(p, oid, oid_len);
394 p += oid_len;
f24e9980 395
68b4476b
YS		 396 src_op = src_ops;
397 while (src_op->op) {
398 osd_req_encode_op(req, op, src_op);
399 src_op++;
f24e9980 400 op++;
f24e9980 401 }
68b4476b
YS		 402
403 if (req->r_trail)
404 data_len += req->r_trail->length;
405
f24e9980
SW		 406 if (snapc) {
407 head->snap_seq = cpu_to_le64(snapc->seq);
408 head->num_snaps = cpu_to_le32(snapc->num_snaps);
409 for (i = 0; i < snapc->num_snaps; i++) {
410 put_unaligned_le64(snapc->snaps[i], p);
411 p += sizeof(u64);
412 }
413 }
414
68b4476b
YS		 415 if (flags & CEPH_OSD_FLAG_WRITE) {
416 req->r_request->hdr.data_off = cpu_to_le16(off);
417 req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
418 } else if (data_len) {
419 req->r_request->hdr.data_off = 0;
420 req->r_request->hdr.data_len = cpu_to_le32(data_len);
421 }
422
c5c6b19d
SW		 423 req->r_request->page_alignment = req->r_page_alignment;
424
f24e9980 425 BUG_ON(p > msg->front.iov_base + msg->front.iov_len);
6f863e71
SW		 426 msg_size = p - msg->front.iov_base;
427 msg->front.iov_len = msg_size;
428 msg->hdr.front_len = cpu_to_le32(msg_size);
3499e8a5
YS		 429 return;
430}
3d14c5d2 431EXPORT_SYMBOL(ceph_osdc_build_request);
3499e8a5
YS		 432
433/*
434 * build new request AND message, calculate layout, and adjust file
435 * extent as needed.
436 *
437 * if the file was recently truncated, we include information about its
438 * old and new size so that the object can be updated appropriately. (we
439 * avoid synchronously deleting truncated objects because it's slow.)
440 *
441 * if @do_sync, include a 'startsync' command so that the osd will flush
442 * data quickly.
443 */
444struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
445 struct ceph_file_layout *layout,
446 struct ceph_vino vino,
447 u64 off, u64 *plen,
448 int opcode, int flags,
449 struct ceph_snap_context *snapc,
450 int do_sync,
451 u32 truncate_seq,
452 u64 truncate_size,
453 struct timespec *mtime,
b7495fc2
SW		 454 bool use_mempool, int num_reply,
455 int page_align)
3499e8a5 456{
68b4476b
YS		 457 struct ceph_osd_req_op ops[3];
458 struct ceph_osd_request *req;
459
460 ops[0].op = opcode;
461 ops[0].extent.truncate_seq = truncate_seq;
462 ops[0].extent.truncate_size = truncate_size;
463 ops[0].payload_len = 0;
464
465 if (do_sync) {
466 ops[1].op = CEPH_OSD_OP_STARTSYNC;
467 ops[1].payload_len = 0;
468 ops[2].op = 0;
469 } else
470 ops[1].op = 0;
471
472 req = ceph_osdc_alloc_request(osdc, flags,
473 snapc, ops,
3499e8a5 474 use_mempool,
68b4476b 475 GFP_NOFS, NULL, NULL);
4ad12621
SW		 476 if (!req)
477 return NULL;
3499e8a5
YS		 478
479 /* calculate max write size */
68b4476b 480 calc_layout(osdc, vino, layout, off, plen, req, ops);
3499e8a5
YS		 481 req->r_file_layout = *layout; /* keep a copy */
482
9bb0ce2b
SW		 483 /* in case it differs from natural (file) alignment that
484 calc_layout filled in for us */
485 req->r_num_pages = calc_pages_for(page_align, *plen);
b7495fc2
SW		 486 req->r_page_alignment = page_align;
487
68b4476b
YS		 488 ceph_osdc_build_request(req, off, plen, ops,
489 snapc,
3499e8a5
YS		 490 mtime,
491 req->r_oid, req->r_oid_len);
492
f24e9980
SW		 493 return req;
494}
3d14c5d2 495EXPORT_SYMBOL(ceph_osdc_new_request);
f24e9980
SW		 496
497/*
498 * We keep osd requests in an rbtree, sorted by ->r_tid.
499 */
500static void __insert_request(struct ceph_osd_client *osdc,
501 struct ceph_osd_request *new)
502{
503 struct rb_node **p = &osdc->requests.rb_node;
504 struct rb_node *parent = NULL;
505 struct ceph_osd_request *req = NULL;
506
507 while (*p) {
508 parent = *p;
509 req = rb_entry(parent, struct ceph_osd_request, r_node);
510 if (new->r_tid < req->r_tid)
511 p = &(*p)->rb_left;
512 else if (new->r_tid > req->r_tid)
513 p = &(*p)->rb_right;
514 else
515 BUG();
516 }
517
518 rb_link_node(&new->r_node, parent, p);
519 rb_insert_color(&new->r_node, &osdc->requests);
520}
521
522static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc,
523 u64 tid)
524{
525 struct ceph_osd_request *req;
526 struct rb_node *n = osdc->requests.rb_node;
527
528 while (n) {
529 req = rb_entry(n, struct ceph_osd_request, r_node);
530 if (tid < req->r_tid)
531 n = n->rb_left;
532 else if (tid > req->r_tid)
533 n = n->rb_right;
534 else
535 return req;
536 }
537 return NULL;
538}
539
540static struct ceph_osd_request *
541__lookup_request_ge(struct ceph_osd_client *osdc,
542 u64 tid)
543{
544 struct ceph_osd_request *req;
545 struct rb_node *n = osdc->requests.rb_node;
546
547 while (n) {
548 req = rb_entry(n, struct ceph_osd_request, r_node);
549 if (tid < req->r_tid) {
550 if (!n->rb_left)
551 return req;
552 n = n->rb_left;
553 } else if (tid > req->r_tid) {
554 n = n->rb_right;
555 } else {
556 return req;
557 }
558 }
559 return NULL;
560}
561
6f6c7006
SW		 562/*
563 * Resubmit requests pending on the given osd.
564 */
565static void __kick_osd_requests(struct ceph_osd_client *osdc,
566 struct ceph_osd *osd)
567{
a40c4f10 568 struct ceph_osd_request *req, *nreq;
6f6c7006
SW		 569 int err;
570
571 dout("__kick_osd_requests osd%d\n", osd->o_osd);
572 err = __reset_osd(osdc, osd);
573 if (err == -EAGAIN)
574 return;
575
576 list_for_each_entry(req, &osd->o_requests, r_osd_item) {
577 list_move(&req->r_req_lru_item, &osdc->req_unsent);
578 dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
579 osd->o_osd);
a40c4f10
YS		 580 if (!req->r_linger)
581 req->r_flags |= CEPH_OSD_FLAG_RETRY;
582 }
583
584 list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
585 r_linger_osd) {
77f38e0e
SW		 586 /*
587 * reregister request prior to unregistering linger so
588 * that r_osd is preserved.
589 */
590 BUG_ON(!list_empty(&req->r_req_lru_item));
a40c4f10 591 __register_request(osdc, req);
77f38e0e
SW		 592 list_add(&req->r_req_lru_item, &osdc->req_unsent);
593 list_add(&req->r_osd_item, &req->r_osd->o_requests);
594 __unregister_linger_request(osdc, req);
a40c4f10
YS		 595 dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
596 osd->o_osd);
6f6c7006
SW		 597 }
598}
599
600static void kick_osd_requests(struct ceph_osd_client *osdc,
601 struct ceph_osd *kickosd)
602{
603 mutex_lock(&osdc->request_mutex);
604 __kick_osd_requests(osdc, kickosd);
605 mutex_unlock(&osdc->request_mutex);
606}
f24e9980
SW		 607
608/*
81b024e7 609 * If the osd connection drops, we need to resubmit all requests.
f24e9980
SW		 610 */
611static void osd_reset(struct ceph_connection *con)
612{
613 struct ceph_osd *osd = con->private;
614 struct ceph_osd_client *osdc;
615
616 if (!osd)
617 return;
618 dout("osd_reset osd%d\n", osd->o_osd);
619 osdc = osd->o_osdc;
f24e9980 620 down_read(&osdc->map_sem);
6f6c7006
SW		 621 kick_osd_requests(osdc, osd);
622 send_queued(osdc);
f24e9980
SW		 623 up_read(&osdc->map_sem);
624}
625
626/*
627 * Track open sessions with osds.
628 */
e10006f8 629static struct ceph_osd *create_osd(struct ceph_osd_client *osdc, int onum)
f24e9980
SW		 630{
631 struct ceph_osd *osd;
632
633 osd = kzalloc(sizeof(*osd), GFP_NOFS);
634 if (!osd)
635 return NULL;
636
637 atomic_set(&osd->o_ref, 1);
638 osd->o_osdc = osdc;
e10006f8 639 osd->o_osd = onum;
f24e9980 640 INIT_LIST_HEAD(&osd->o_requests);
a40c4f10 641 INIT_LIST_HEAD(&osd->o_linger_requests);
f5a2041b 642 INIT_LIST_HEAD(&osd->o_osd_lru);
f24e9980
SW		 643 osd->o_incarnation = 1;
644
b7a9e5dd 645 ceph_con_init(&osd->o_con, osd, &osd_con_ops, &osdc->client->msgr);
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{
048a9d2d 691 dout("%s %p\n", __func__, osdc);
aca420bc
SW		 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);
b7a9e5dd
SW		 755 ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
756 &osdc->osdmap->osd_addr[osd->o_osd]);
f24e9980
SW		 757 osd->o_incarnation++;
758 }
759 return ret;
760}
761
762static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
763{
764 struct rb_node **p = &osdc->osds.rb_node;
765 struct rb_node *parent = NULL;
766 struct ceph_osd *osd = NULL;
767
aca420bc 768 dout("__insert_osd %p osd%d\n", new, new->o_osd);
f24e9980
SW		 769 while (*p) {
770 parent = *p;
771 osd = rb_entry(parent, struct ceph_osd, o_node);
772 if (new->o_osd < osd->o_osd)
773 p = &(*p)->rb_left;
774 else if (new->o_osd > osd->o_osd)
775 p = &(*p)->rb_right;
776 else
777 BUG();
778 }
779
780 rb_link_node(&new->o_node, parent, p);
781 rb_insert_color(&new->o_node, &osdc->osds);
782}
783
784static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o)
785{
786 struct ceph_osd *osd;
787 struct rb_node *n = osdc->osds.rb_node;
788
789 while (n) {
790 osd = rb_entry(n, struct ceph_osd, o_node);
791 if (o < osd->o_osd)
792 n = n->rb_left;
793 else if (o > osd->o_osd)
794 n = n->rb_right;
795 else
796 return osd;
797 }
798 return NULL;
799}
800
422d2cb8
YS		 801static void __schedule_osd_timeout(struct ceph_osd_client *osdc)
802{
803 schedule_delayed_work(&osdc->timeout_work,
3d14c5d2 804 osdc->client->options->osd_keepalive_timeout * HZ);
422d2cb8
YS		 805}
806
807static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
808{
809 cancel_delayed_work(&osdc->timeout_work);
810}
f24e9980
SW		 811
812/*
813 * Register request, assign tid. If this is the first request, set up
814 * the timeout event.
815 */
a40c4f10
YS		 816static void __register_request(struct ceph_osd_client *osdc,
817 struct ceph_osd_request *req)
f24e9980 818{
f24e9980 819 req->r_tid = ++osdc->last_tid;
6df058c0 820 req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
77f38e0e 821 dout("__register_request %p tid %lld\n", req, req->r_tid);
f24e9980
SW		 822 __insert_request(osdc, req);
823 ceph_osdc_get_request(req);
824 osdc->num_requests++;
f24e9980 825 if (osdc->num_requests == 1) {
422d2cb8
YS		 826 dout(" first request, scheduling timeout\n");
827 __schedule_osd_timeout(osdc);
f24e9980 828 }
a40c4f10
YS		 829}
830
831static void register_request(struct ceph_osd_client *osdc,
832 struct ceph_osd_request *req)
833{
834 mutex_lock(&osdc->request_mutex);
835 __register_request(osdc, req);
f24e9980
SW		 836 mutex_unlock(&osdc->request_mutex);
837}
838
839/*
840 * called under osdc->request_mutex
841 */
842static void __unregister_request(struct ceph_osd_client *osdc,
843 struct ceph_osd_request *req)
844{
35f9f8a0
SW		 845 if (RB_EMPTY_NODE(&req->r_node)) {
846 dout("__unregister_request %p tid %lld not registered\n",
847 req, req->r_tid);
848 return;
849 }
850
f24e9980
SW		 851 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
852 rb_erase(&req->r_node, &osdc->requests);
853 osdc->num_requests--;
854
0ba6478d
SW		 855 if (req->r_osd) {
856 /* make sure the original request isn't in flight. */
6740a845 857 ceph_msg_revoke(req->r_request);
0ba6478d
SW		 858
859 list_del_init(&req->r_osd_item);
a40c4f10
YS		 860 if (list_empty(&req->r_osd->o_requests) &&
861 list_empty(&req->r_osd->o_linger_requests)) {
862 dout("moving osd to %p lru\n", req->r_osd);
f5a2041b 863 __move_osd_to_lru(osdc, req->r_osd);
a40c4f10 864 }
fbdb9190 865 if (list_empty(&req->r_linger_item))
a40c4f10 866 req->r_osd = NULL;
0ba6478d 867 }
f24e9980
SW		 868
869 ceph_osdc_put_request(req);
870
422d2cb8
YS		 871 list_del_init(&req->r_req_lru_item);
872 if (osdc->num_requests == 0) {
873 dout(" no requests, canceling timeout\n");
874 __cancel_osd_timeout(osdc);
f24e9980
SW		 875 }
876}
877
878/*
879 * Cancel a previously queued request message
880 */
881static void __cancel_request(struct ceph_osd_request *req)
882{
6bc18876 883 if (req->r_sent && req->r_osd) {
6740a845 884 ceph_msg_revoke(req->r_request);
f24e9980
SW		 885 req->r_sent = 0;
886 }
887}
888
a40c4f10
YS		 889static void __register_linger_request(struct ceph_osd_client *osdc,
890 struct ceph_osd_request *req)
891{
892 dout("__register_linger_request %p\n", req);
893 list_add_tail(&req->r_linger_item, &osdc->req_linger);
6194ea89
SW		 894 if (req->r_osd)
895 list_add_tail(&req->r_linger_osd,
896 &req->r_osd->o_linger_requests);
a40c4f10
YS		 897}
898
899static void __unregister_linger_request(struct ceph_osd_client *osdc,
900 struct ceph_osd_request *req)
901{
902 dout("__unregister_linger_request %p\n", req);
903 if (req->r_osd) {
904 list_del_init(&req->r_linger_item);
905 list_del_init(&req->r_linger_osd);
906
907 if (list_empty(&req->r_osd->o_requests) &&
908 list_empty(&req->r_osd->o_linger_requests)) {
909 dout("moving osd to %p lru\n", req->r_osd);
910 __move_osd_to_lru(osdc, req->r_osd);
911 }
fbdb9190
SW		 912 if (list_empty(&req->r_osd_item))
913 req->r_osd = NULL;
a40c4f10
YS		 914 }
915}
916
917void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
918 struct ceph_osd_request *req)
919{
920 mutex_lock(&osdc->request_mutex);
921 if (req->r_linger) {
922 __unregister_linger_request(osdc, req);
923 ceph_osdc_put_request(req);
924 }
925 mutex_unlock(&osdc->request_mutex);
926}
927EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
928
929void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
930 struct ceph_osd_request *req)
931{
932 if (!req->r_linger) {
933 dout("set_request_linger %p\n", req);
934 req->r_linger = 1;
935 /*
936 * caller is now responsible for calling
937 * unregister_linger_request
938 */
939 ceph_osdc_get_request(req);
940 }
941}
942EXPORT_SYMBOL(ceph_osdc_set_request_linger);
943
f24e9980
SW		 944/*
945 * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
946 * (as needed), and set the request r_osd appropriately. If there is
25985edc 947 * no up osd, set r_osd to NULL. Move the request to the appropriate list
6f6c7006 948 * (unsent, homeless) or leave on in-flight lru.
f24e9980
SW		 949 *
950 * Return 0 if unchanged, 1 if changed, or negative on error.
951 *
952 * Caller should hold map_sem for read and request_mutex.
953 */
6f6c7006 954static int __map_request(struct ceph_osd_client *osdc,
38d6453c 955 struct ceph_osd_request *req, int force_resend)
f24e9980
SW		 956{
957 struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
51042122 958 struct ceph_pg pgid;
d85b7056
SW		 959 int acting[CEPH_PG_MAX_SIZE];
960 int o = -1, num = 0;
f24e9980 961 int err;
f24e9980 962
6f6c7006 963 dout("map_request %p tid %lld\n", req, req->r_tid);
f24e9980
SW		 964 err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
965 &req->r_file_layout, osdc->osdmap);
6f6c7006
SW		 966 if (err) {
967 list_move(&req->r_req_lru_item, &osdc->req_notarget);
f24e9980 968 return err;
6f6c7006 969 }
51042122 970 pgid = reqhead->layout.ol_pgid;
7740a42f
SW		 971 req->r_pgid = pgid;
972
d85b7056
SW		 973 err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
974 if (err > 0) {
975 o = acting[0];
976 num = err;
977 }
f24e9980 978
38d6453c
SW		 979 if ((!force_resend &&
980 req->r_osd && req->r_osd->o_osd == o &&
d85b7056
SW		 981 req->r_sent >= req->r_osd->o_incarnation &&
982 req->r_num_pg_osds == num &&
983 memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) ||
f24e9980
SW		 984 (req->r_osd == NULL && o == -1))
985 return 0; /* no change */
986
6f6c7006 987 dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
51042122 988 req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
f24e9980
SW		 989 req->r_osd ? req->r_osd->o_osd : -1);
990
d85b7056
SW		 991 /* record full pg acting set */
992 memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num);
993 req->r_num_pg_osds = num;
994
f24e9980
SW		 995 if (req->r_osd) {
996 __cancel_request(req);
997 list_del_init(&req->r_osd_item);
f24e9980
SW		 998 req->r_osd = NULL;
999 }
1000
1001 req->r_osd = __lookup_osd(osdc, o);
1002 if (!req->r_osd && o >= 0) {
c99eb1c7 1003 err = -ENOMEM;
e10006f8 1004 req->r_osd = create_osd(osdc, o);
6f6c7006
SW		 1005 if (!req->r_osd) {
1006 list_move(&req->r_req_lru_item, &osdc->req_notarget);
c99eb1c7 1007 goto out;
6f6c7006 1008 }
f24e9980 1009
6f6c7006 1010 dout("map_request osd %p is osd%d\n", req->r_osd, o);
f24e9980
SW		 1011 __insert_osd(osdc, req->r_osd);
1012
b7a9e5dd
SW		 1013 ceph_con_open(&req->r_osd->o_con,
1014 CEPH_ENTITY_TYPE_OSD, o,
1015 &osdc->osdmap->osd_addr[o]);
f24e9980
SW		 1016 }
1017
f5a2041b
YS		 1018 if (req->r_osd) {
1019 __remove_osd_from_lru(req->r_osd);
f24e9980 1020 list_add(&req->r_osd_item, &req->r_osd->o_requests);
6f6c7006
SW		 1021 list_move(&req->r_req_lru_item, &osdc->req_unsent);
1022 } else {
1023 list_move(&req->r_req_lru_item, &osdc->req_notarget);
f5a2041b 1024 }
d85b7056 1025 err = 1; /* osd or pg changed */
f24e9980
SW		 1026
1027out:
f24e9980
SW		 1028 return err;
1029}
1030
1031/*
1032 * caller should hold map_sem (for read) and request_mutex
1033 */
56e925b6
SW		 1034static void __send_request(struct ceph_osd_client *osdc,
1035 struct ceph_osd_request *req)
f24e9980
SW		 1036{
1037 struct ceph_osd_request_head *reqhead;
f24e9980
SW		 1038
1039 dout("send_request %p tid %llu to osd%d flags %d\n",
1040 req, req->r_tid, req->r_osd->o_osd, req->r_flags);
1041
1042 reqhead = req->r_request->front.iov_base;
1043 reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch);
1044 reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */
1045 reqhead->reassert_version = req->r_reassert_version;
1046
3dd72fc0 1047 req->r_stamp = jiffies;
07a27e22 1048 list_move_tail(&req->r_req_lru_item, &osdc->req_lru);
f24e9980
SW		 1049
1050 ceph_msg_get(req->r_request); /* send consumes a ref */
1051 ceph_con_send(&req->r_osd->o_con, req->r_request);
1052 req->r_sent = req->r_osd->o_incarnation;
f24e9980
SW		 1053}
1054
6f6c7006
SW		 1055/*
1056 * Send any requests in the queue (req_unsent).
1057 */
1058static void send_queued(struct ceph_osd_client *osdc)
1059{
1060 struct ceph_osd_request *req, *tmp;
1061
1062 dout("send_queued\n");
1063 mutex_lock(&osdc->request_mutex);
1064 list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
1065 __send_request(osdc, req);
1066 }
1067 mutex_unlock(&osdc->request_mutex);
1068}
1069
f24e9980
SW		 1070/*
1071 * Timeout callback, called every N seconds when 1 or more osd
1072 * requests has been active for more than N seconds. When this
1073 * happens, we ping all OSDs with requests who have timed out to
1074 * ensure any communications channel reset is detected. Reset the
1075 * request timeouts another N seconds in the future as we go.
1076 * Reschedule the timeout event another N seconds in future (unless
1077 * there are no open requests).
1078 */
1079static void handle_timeout(struct work_struct *work)
1080{
1081 struct ceph_osd_client *osdc =
1082 container_of(work, struct ceph_osd_client, timeout_work.work);
422d2cb8 1083 struct ceph_osd_request *req, *last_req = NULL;
f24e9980 1084 struct ceph_osd *osd;
3d14c5d2 1085 unsigned long timeout = osdc->client->options->osd_timeout * HZ;
422d2cb8 1086 unsigned long keepalive =
3d14c5d2 1087 osdc->client->options->osd_keepalive_timeout * HZ;
3dd72fc0 1088 unsigned long last_stamp = 0;
422d2cb8 1089 struct list_head slow_osds;
f24e9980
SW		 1090 dout("timeout\n");
1091 down_read(&osdc->map_sem);
1092
1093 ceph_monc_request_next_osdmap(&osdc->client->monc);
1094
1095 mutex_lock(&osdc->request_mutex);
f24e9980 1096
422d2cb8
YS		 1097 /*
1098 * reset osds that appear to be _really_ unresponsive. this
1099 * is a failsafe measure.. we really shouldn't be getting to
1100 * this point if the system is working properly. the monitors
1101 * should mark the osd as failed and we should find out about
1102 * it from an updated osd map.
1103 */
f26e681d 1104 while (timeout && !list_empty(&osdc->req_lru)) {
422d2cb8
YS		 1105 req = list_entry(osdc->req_lru.next, struct ceph_osd_request,
1106 r_req_lru_item);
1107
4cf9d544 1108 /* hasn't been long enough since we sent it? */
3dd72fc0 1109 if (time_before(jiffies, req->r_stamp + timeout))
422d2cb8 1110 break;
4cf9d544
SW		 1111
1112 /* hasn't been long enough since it was acked? */
1113 if (req->r_request->ack_stamp == 0 ||
1114 time_before(jiffies, req->r_request->ack_stamp + timeout))
1115 break;
422d2cb8 1116
3dd72fc0 1117 BUG_ON(req == last_req && req->r_stamp == last_stamp);
422d2cb8 1118 last_req = req;
3dd72fc0 1119 last_stamp = req->r_stamp;
422d2cb8
YS		 1120
1121 osd = req->r_osd;
1122 BUG_ON(!osd);
1123 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
1124 req->r_tid, osd->o_osd);
6f6c7006 1125 __kick_osd_requests(osdc, osd);
422d2cb8
YS		 1126 }
1127
1128 /*
1129 * ping osds that are a bit slow. this ensures that if there
1130 * is a break in the TCP connection we will notice, and reopen
1131 * a connection with that osd (from the fault callback).
1132 */
1133 INIT_LIST_HEAD(&slow_osds);
1134 list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) {
3dd72fc0 1135 if (time_before(jiffies, req->r_stamp + keepalive))
422d2cb8
YS		 1136 break;
1137
1138 osd = req->r_osd;
1139 BUG_ON(!osd);
1140 dout(" tid %llu is slow, will send keepalive on osd%d\n",
f24e9980 1141 req->r_tid, osd->o_osd);
422d2cb8
YS		 1142 list_move_tail(&osd->o_keepalive_item, &slow_osds);
1143 }
1144 while (!list_empty(&slow_osds)) {
1145 osd = list_entry(slow_osds.next, struct ceph_osd,
1146 o_keepalive_item);
1147 list_del_init(&osd->o_keepalive_item);
f24e9980
SW		 1148 ceph_con_keepalive(&osd->o_con);
1149 }
1150
422d2cb8 1151 __schedule_osd_timeout(osdc);
f24e9980 1152 mutex_unlock(&osdc->request_mutex);
6f6c7006 1153 send_queued(osdc);
f24e9980
SW		 1154 up_read(&osdc->map_sem);
1155}
1156
f5a2041b
YS		 1157static void handle_osds_timeout(struct work_struct *work)
1158{
1159 struct ceph_osd_client *osdc =
1160 container_of(work, struct ceph_osd_client,
1161 osds_timeout_work.work);
1162 unsigned long delay =
3d14c5d2 1163 osdc->client->options->osd_idle_ttl * HZ >> 2;
f5a2041b
YS		 1164
1165 dout("osds timeout\n");
1166 down_read(&osdc->map_sem);
aca420bc 1167 remove_old_osds(osdc);
f5a2041b
YS		 1168 up_read(&osdc->map_sem);
1169
1170 schedule_delayed_work(&osdc->osds_timeout_work,
1171 round_jiffies_relative(delay));
1172}
1173
25845472
SW		 1174static void complete_request(struct ceph_osd_request *req)
1175{
1176 if (req->r_safe_callback)
1177 req->r_safe_callback(req, NULL);
1178 complete_all(&req->r_safe_completion); /* fsync waiter */
1179}
1180
f24e9980
SW		 1181/*
1182 * handle osd op reply. either call the callback if it is specified,
1183 * or do the completion to wake up the waiting thread.
1184 */
350b1c32
SW		 1185static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
1186 struct ceph_connection *con)
f24e9980
SW		 1187{
1188 struct ceph_osd_reply_head *rhead = msg->front.iov_base;
1189 struct ceph_osd_request *req;
1190 u64 tid;
1191 int numops, object_len, flags;
0ceed5db 1192 s32 result;
f24e9980 1193
6df058c0 1194 tid = le64_to_cpu(msg->hdr.tid);
f24e9980
SW		 1195 if (msg->front.iov_len < sizeof(*rhead))
1196 goto bad;
f24e9980
SW		 1197 numops = le32_to_cpu(rhead->num_ops);
1198 object_len = le32_to_cpu(rhead->object_len);
0ceed5db 1199 result = le32_to_cpu(rhead->result);
f24e9980
SW		 1200 if (msg->front.iov_len != sizeof(*rhead) + object_len +
1201 numops * sizeof(struct ceph_osd_op))
1202 goto bad;
0ceed5db 1203 dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
f24e9980
SW		 1204 /* lookup */
1205 mutex_lock(&osdc->request_mutex);
1206 req = __lookup_request(osdc, tid);
1207 if (req == NULL) {
1208 dout("handle_reply tid %llu dne\n", tid);
1209 mutex_unlock(&osdc->request_mutex);
1210 return;
1211 }
1212 ceph_osdc_get_request(req);
1213 flags = le32_to_cpu(rhead->flags);
1214
350b1c32 1215 /*
0d59ab81 1216 * if this connection filled our message, drop our reference now, to
350b1c32
SW		 1217 * avoid a (safe but slower) revoke later.
1218 */
0d59ab81 1219 if (req->r_con_filling_msg == con && req->r_reply == msg) {
c16e7869 1220 dout(" dropping con_filling_msg ref %p\n", con);
0d59ab81 1221 req->r_con_filling_msg = NULL;
0d47766f 1222 con->ops->put(con);
350b1c32
SW		 1223 }
1224
f24e9980 1225 if (!req->r_got_reply) {
95c96174 1226 unsigned int bytes;
f24e9980
SW		 1227
1228 req->r_result = le32_to_cpu(rhead->result);
1229 bytes = le32_to_cpu(msg->hdr.data_len);
1230 dout("handle_reply result %d bytes %d\n", req->r_result,
1231 bytes);
1232 if (req->r_result == 0)
1233 req->r_result = bytes;
1234
1235 /* in case this is a write and we need to replay, */
1236 req->r_reassert_version = rhead->reassert_version;
1237
1238 req->r_got_reply = 1;
1239 } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) {
1240 dout("handle_reply tid %llu dup ack\n", tid);
34b43a56 1241 mutex_unlock(&osdc->request_mutex);
f24e9980
SW		 1242 goto done;
1243 }
1244
1245 dout("handle_reply tid %llu flags %d\n", tid, flags);
1246
a40c4f10
YS		 1247 if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
1248 __register_linger_request(osdc, req);
1249
f24e9980 1250 /* either this is a read, or we got the safe response */
0ceed5db
SW		 1251 if (result < 0 ||
1252 (flags & CEPH_OSD_FLAG_ONDISK) ||
f24e9980
SW		 1253 ((flags & CEPH_OSD_FLAG_WRITE) == 0))
1254 __unregister_request(osdc, req);
1255
1256 mutex_unlock(&osdc->request_mutex);
1257
1258 if (req->r_callback)
1259 req->r_callback(req, msg);
1260 else
03066f23 1261 complete_all(&req->r_completion);
f24e9980 1262
25845472
SW		 1263 if (flags & CEPH_OSD_FLAG_ONDISK)
1264 complete_request(req);
f24e9980
SW		 1265
1266done:
a40c4f10 1267 dout("req=%p req->r_linger=%d\n", req, req->r_linger);
f24e9980
SW		 1268 ceph_osdc_put_request(req);
1269 return;
1270
1271bad:
1272 pr_err("corrupt osd_op_reply got %d %d expected %d\n",
1273 (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len),
1274 (int)sizeof(*rhead));
9ec7cab1 1275 ceph_msg_dump(msg);
f24e9980
SW		 1276}
1277
6f6c7006 1278static void reset_changed_osds(struct ceph_osd_client *osdc)
f24e9980 1279{
f24e9980 1280 struct rb_node *p, *n;
f24e9980 1281
6f6c7006
SW		 1282 for (p = rb_first(&osdc->osds); p; p = n) {
1283 struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
f24e9980 1284
6f6c7006
SW		 1285 n = rb_next(p);
1286 if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
1287 memcmp(&osd->o_con.peer_addr,
1288 ceph_osd_addr(osdc->osdmap,
1289 osd->o_osd),
1290 sizeof(struct ceph_entity_addr)) != 0)
1291 __reset_osd(osdc, osd);
f24e9980 1292 }
422d2cb8
YS		 1293}
1294
1295/*
6f6c7006
SW		 1296 * Requeue requests whose mapping to an OSD has changed. If requests map to
1297 * no osd, request a new map.
422d2cb8
YS		 1298 *
1299 * Caller should hold map_sem for read and request_mutex.
1300 */
38d6453c 1301static void kick_requests(struct ceph_osd_client *osdc, int force_resend)
422d2cb8 1302{
a40c4f10 1303 struct ceph_osd_request *req, *nreq;
6f6c7006
SW		 1304 struct rb_node *p;
1305 int needmap = 0;
1306 int err;
422d2cb8 1307
38d6453c 1308 dout("kick_requests %s\n", force_resend ? " (force resend)" : "");
422d2cb8 1309 mutex_lock(&osdc->request_mutex);
6194ea89 1310 for (p = rb_first(&osdc->requests); p; ) {
6f6c7006 1311 req = rb_entry(p, struct ceph_osd_request, r_node);
6194ea89 1312 p = rb_next(p);
38d6453c 1313 err = __map_request(osdc, req, force_resend);
6f6c7006
SW		 1314 if (err < 0)
1315 continue; /* error */
1316 if (req->r_osd == NULL) {
1317 dout("%p tid %llu maps to no osd\n", req, req->r_tid);
1318 needmap++; /* request a newer map */
1319 } else if (err > 0) {
6194ea89
SW		 1320 if (!req->r_linger) {
1321 dout("%p tid %llu requeued on osd%d\n", req,
1322 req->r_tid,
1323 req->r_osd ? req->r_osd->o_osd : -1);
a40c4f10 1324 req->r_flags |= CEPH_OSD_FLAG_RETRY;
6194ea89
SW		 1325 }
1326 }
1327 if (req->r_linger && list_empty(&req->r_linger_item)) {
1328 /*
1329 * register as a linger so that we will
1330 * re-submit below and get a new tid
1331 */
1332 dout("%p tid %llu restart on osd%d\n",
1333 req, req->r_tid,
1334 req->r_osd ? req->r_osd->o_osd : -1);
1335 __register_linger_request(osdc, req);
1336 __unregister_request(osdc, req);
a40c4f10
YS		 1337 }
1338 }
1339
1340 list_for_each_entry_safe(req, nreq, &osdc->req_linger,
1341 r_linger_item) {
1342 dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
1343
38d6453c 1344 err = __map_request(osdc, req, force_resend);
a40c4f10
YS		 1345 if (err == 0)
1346 continue; /* no change and no osd was specified */
1347 if (err < 0)
1348 continue; /* hrm! */
1349 if (req->r_osd == NULL) {
1350 dout("tid %llu maps to no valid osd\n", req->r_tid);
1351 needmap++; /* request a newer map */
1352 continue;
6f6c7006 1353 }
a40c4f10
YS		 1354
1355 dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
1356 req->r_osd ? req->r_osd->o_osd : -1);
1357 __unregister_linger_request(osdc, req);
1358 __register_request(osdc, req);
6f6c7006 1359 }
f24e9980
SW		 1360 mutex_unlock(&osdc->request_mutex);
1361
1362 if (needmap) {
1363 dout("%d requests for down osds, need new map\n", needmap);
1364 ceph_monc_request_next_osdmap(&osdc->client->monc);
1365 }
422d2cb8 1366}
6f6c7006
SW		 1367
1368
f24e9980
SW		 1369/*
1370 * Process updated osd map.
1371 *
1372 * The message contains any number of incremental and full maps, normally
1373 * indicating some sort of topology change in the cluster. Kick requests
1374 * off to different OSDs as needed.
1375 */
1376void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1377{
1378 void *p, *end, *next;
1379 u32 nr_maps, maplen;
1380 u32 epoch;
1381 struct ceph_osdmap *newmap = NULL, *oldmap;
1382 int err;
1383 struct ceph_fsid fsid;
1384
1385 dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0);
1386 p = msg->front.iov_base;
1387 end = p + msg->front.iov_len;
1388
1389 /* verify fsid */
1390 ceph_decode_need(&p, end, sizeof(fsid), bad);
1391 ceph_decode_copy(&p, &fsid, sizeof(fsid));
0743304d
SW		 1392 if (ceph_check_fsid(osdc->client, &fsid) < 0)
1393 return;
f24e9980
SW		 1394
1395 down_write(&osdc->map_sem);
1396
1397 /* incremental maps */
1398 ceph_decode_32_safe(&p, end, nr_maps, bad);
1399 dout(" %d inc maps\n", nr_maps);
1400 while (nr_maps > 0) {
1401 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 1402 epoch = ceph_decode_32(&p);
1403 maplen = ceph_decode_32(&p);
f24e9980
SW		 1404 ceph_decode_need(&p, end, maplen, bad);
1405 next = p + maplen;
1406 if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) {
1407 dout("applying incremental map %u len %d\n",
1408 epoch, maplen);
1409 newmap = osdmap_apply_incremental(&p, next,
1410 osdc->osdmap,
15d9882c 1411 &osdc->client->msgr);
f24e9980
SW		 1412 if (IS_ERR(newmap)) {
1413 err = PTR_ERR(newmap);
1414 goto bad;
1415 }
30dc6381 1416 BUG_ON(!newmap);
f24e9980
SW		 1417 if (newmap != osdc->osdmap) {
1418 ceph_osdmap_destroy(osdc->osdmap);
1419 osdc->osdmap = newmap;
1420 }
38d6453c 1421 kick_requests(osdc, 0);
6f6c7006 1422 reset_changed_osds(osdc);
f24e9980
SW		 1423 } else {
1424 dout("ignoring incremental map %u len %d\n",
1425 epoch, maplen);
1426 }
1427 p = next;
1428 nr_maps--;
1429 }
1430 if (newmap)
1431 goto done;
1432
1433 /* full maps */
1434 ceph_decode_32_safe(&p, end, nr_maps, bad);
1435 dout(" %d full maps\n", nr_maps);
1436 while (nr_maps) {
1437 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 1438 epoch = ceph_decode_32(&p);
1439 maplen = ceph_decode_32(&p);
f24e9980
SW		 1440 ceph_decode_need(&p, end, maplen, bad);
1441 if (nr_maps > 1) {
1442 dout("skipping non-latest full map %u len %d\n",
1443 epoch, maplen);
1444 } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) {
1445 dout("skipping full map %u len %d, "
1446 "older than our %u\n", epoch, maplen,
1447 osdc->osdmap->epoch);
1448 } else {
38d6453c
SW		 1449 int skipped_map = 0;
1450
f24e9980
SW		 1451 dout("taking full map %u len %d\n", epoch, maplen);
1452 newmap = osdmap_decode(&p, p+maplen);
1453 if (IS_ERR(newmap)) {
1454 err = PTR_ERR(newmap);
1455 goto bad;
1456 }
30dc6381 1457 BUG_ON(!newmap);
f24e9980
SW		 1458 oldmap = osdc->osdmap;
1459 osdc->osdmap = newmap;
38d6453c
SW		 1460 if (oldmap) {
1461 if (oldmap->epoch + 1 < newmap->epoch)
1462 skipped_map = 1;
f24e9980 1463 ceph_osdmap_destroy(oldmap);
38d6453c
SW		 1464 }
1465 kick_requests(osdc, skipped_map);
f24e9980
SW		 1466 }
1467 p += maplen;
1468 nr_maps--;
1469 }
1470
1471done:
1472 downgrade_write(&osdc->map_sem);
1473 ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
cd634fb6
SW		 1474
1475 /*
1476 * subscribe to subsequent osdmap updates if full to ensure
1477 * we find out when we are no longer full and stop returning
1478 * ENOSPC.
1479 */
1480 if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL))
1481 ceph_monc_request_next_osdmap(&osdc->client->monc);
1482
6f6c7006 1483 send_queued(osdc);
f24e9980 1484 up_read(&osdc->map_sem);
03066f23 1485 wake_up_all(&osdc->client->auth_wq);
f24e9980
SW		 1486 return;
1487
1488bad:
1489 pr_err("osdc handle_map corrupt msg\n");
9ec7cab1 1490 ceph_msg_dump(msg);
f24e9980
SW		 1491 up_write(&osdc->map_sem);
1492 return;
1493}
1494
a40c4f10
YS		 1495/*
1496 * watch/notify callback event infrastructure
1497 *
1498 * These callbacks are used both for watch and notify operations.
1499 */
1500static void __release_event(struct kref *kref)
1501{
1502 struct ceph_osd_event *event =
1503 container_of(kref, struct ceph_osd_event, kref);
1504
1505 dout("__release_event %p\n", event);
1506 kfree(event);
1507}
1508
1509static void get_event(struct ceph_osd_event *event)
1510{
1511 kref_get(&event->kref);
1512}
1513
1514void ceph_osdc_put_event(struct ceph_osd_event *event)
1515{
1516 kref_put(&event->kref, __release_event);
1517}
1518EXPORT_SYMBOL(ceph_osdc_put_event);
1519
1520static void __insert_event(struct ceph_osd_client *osdc,
1521 struct ceph_osd_event *new)
1522{
1523 struct rb_node **p = &osdc->event_tree.rb_node;
1524 struct rb_node *parent = NULL;
1525 struct ceph_osd_event *event = NULL;
1526
1527 while (*p) {
1528 parent = *p;
1529 event = rb_entry(parent, struct ceph_osd_event, node);
1530 if (new->cookie < event->cookie)
1531 p = &(*p)->rb_left;
1532 else if (new->cookie > event->cookie)
1533 p = &(*p)->rb_right;
1534 else
1535 BUG();
1536 }
1537
1538 rb_link_node(&new->node, parent, p);
1539 rb_insert_color(&new->node, &osdc->event_tree);
1540}
1541
1542static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
1543 u64 cookie)
1544{
1545 struct rb_node **p = &osdc->event_tree.rb_node;
1546 struct rb_node *parent = NULL;
1547 struct ceph_osd_event *event = NULL;
1548
1549 while (*p) {
1550 parent = *p;
1551 event = rb_entry(parent, struct ceph_osd_event, node);
1552 if (cookie < event->cookie)
1553 p = &(*p)->rb_left;
1554 else if (cookie > event->cookie)
1555 p = &(*p)->rb_right;
1556 else
1557 return event;
1558 }
1559 return NULL;
1560}
1561
1562static void __remove_event(struct ceph_osd_event *event)
1563{
1564 struct ceph_osd_client *osdc = event->osdc;
1565
1566 if (!RB_EMPTY_NODE(&event->node)) {
1567 dout("__remove_event removed %p\n", event);
1568 rb_erase(&event->node, &osdc->event_tree);
1569 ceph_osdc_put_event(event);
1570 } else {
1571 dout("__remove_event didn't remove %p\n", event);
1572 }
1573}
1574
1575int ceph_osdc_create_event(struct ceph_osd_client *osdc,
1576 void (*event_cb)(u64, u64, u8, void *),
1577 int one_shot, void *data,
1578 struct ceph_osd_event **pevent)
1579{
1580 struct ceph_osd_event *event;
1581
1582 event = kmalloc(sizeof(*event), GFP_NOIO);
1583 if (!event)
1584 return -ENOMEM;
1585
1586 dout("create_event %p\n", event);
1587 event->cb = event_cb;
1588 event->one_shot = one_shot;
1589 event->data = data;
1590 event->osdc = osdc;
1591 INIT_LIST_HEAD(&event->osd_node);
1592 kref_init(&event->kref); /* one ref for us */
1593 kref_get(&event->kref); /* one ref for the caller */
1594 init_completion(&event->completion);
1595
1596 spin_lock(&osdc->event_lock);
1597 event->cookie = ++osdc->event_count;
1598 __insert_event(osdc, event);
1599 spin_unlock(&osdc->event_lock);
1600
1601 *pevent = event;
1602 return 0;
1603}
1604EXPORT_SYMBOL(ceph_osdc_create_event);
1605
1606void ceph_osdc_cancel_event(struct ceph_osd_event *event)
1607{
1608 struct ceph_osd_client *osdc = event->osdc;
1609
1610 dout("cancel_event %p\n", event);
1611 spin_lock(&osdc->event_lock);
1612 __remove_event(event);
1613 spin_unlock(&osdc->event_lock);
1614 ceph_osdc_put_event(event); /* caller's */
1615}
1616EXPORT_SYMBOL(ceph_osdc_cancel_event);
1617
1618
1619static void do_event_work(struct work_struct *work)
1620{
1621 struct ceph_osd_event_work *event_work =
1622 container_of(work, struct ceph_osd_event_work, work);
1623 struct ceph_osd_event *event = event_work->event;
1624 u64 ver = event_work->ver;
1625 u64 notify_id = event_work->notify_id;
1626 u8 opcode = event_work->opcode;
1627
1628 dout("do_event_work completing %p\n", event);
1629 event->cb(ver, notify_id, opcode, event->data);
1630 complete(&event->completion);
1631 dout("do_event_work completed %p\n", event);
1632 ceph_osdc_put_event(event);
1633 kfree(event_work);
1634}
1635
1636
1637/*
1638 * Process osd watch notifications
1639 */
1640void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
1641{
1642 void *p, *end;
1643 u8 proto_ver;
1644 u64 cookie, ver, notify_id;
1645 u8 opcode;
1646 struct ceph_osd_event *event;
1647 struct ceph_osd_event_work *event_work;
1648
1649 p = msg->front.iov_base;
1650 end = p + msg->front.iov_len;
1651
1652 ceph_decode_8_safe(&p, end, proto_ver, bad);
1653 ceph_decode_8_safe(&p, end, opcode, bad);
1654 ceph_decode_64_safe(&p, end, cookie, bad);
1655 ceph_decode_64_safe(&p, end, ver, bad);
1656 ceph_decode_64_safe(&p, end, notify_id, bad);
1657
1658 spin_lock(&osdc->event_lock);
1659 event = __find_event(osdc, cookie);
1660 if (event) {
1661 get_event(event);
1662 if (event->one_shot)
1663 __remove_event(event);
1664 }
1665 spin_unlock(&osdc->event_lock);
1666 dout("handle_watch_notify cookie %lld ver %lld event %p\n",
1667 cookie, ver, event);
1668 if (event) {
1669 event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
a40c4f10
YS		 1670 if (!event_work) {
1671 dout("ERROR: could not allocate event_work\n");
1672 goto done_err;
1673 }
6b0ae409 1674 INIT_WORK(&event_work->work, do_event_work);
a40c4f10
YS		 1675 event_work->event = event;
1676 event_work->ver = ver;
1677 event_work->notify_id = notify_id;
1678 event_work->opcode = opcode;
1679 if (!queue_work(osdc->notify_wq, &event_work->work)) {
1680 dout("WARNING: failed to queue notify event work\n");
1681 goto done_err;
1682 }
1683 }
1684
1685 return;
1686
1687done_err:
1688 complete(&event->completion);
1689 ceph_osdc_put_event(event);
1690 return;
1691
1692bad:
1693 pr_err("osdc handle_watch_notify corrupt msg\n");
1694 return;
1695}
1696
1697int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
1698{
1699 int err;
1700
1701 dout("wait_event %p\n", event);
1702 err = wait_for_completion_interruptible_timeout(&event->completion,
1703 timeout * HZ);
1704 ceph_osdc_put_event(event);
1705 if (err > 0)
1706 err = 0;
1707 dout("wait_event %p returns %d\n", event, err);
1708 return err;
1709}
1710EXPORT_SYMBOL(ceph_osdc_wait_event);
1711
f24e9980
SW		 1712/*
1713 * Register request, send initial attempt.
1714 */
1715int ceph_osdc_start_request(struct ceph_osd_client *osdc,
1716 struct ceph_osd_request *req,
1717 bool nofail)
1718{
c1ea8823 1719 int rc = 0;
f24e9980
SW		 1720
1721 req->r_request->pages = req->r_pages;
1722 req->r_request->nr_pages = req->r_num_pages;
68b4476b
YS		 1723#ifdef CONFIG_BLOCK
1724 req->r_request->bio = req->r_bio;
1725#endif
1726 req->r_request->trail = req->r_trail;
f24e9980
SW		 1727
1728 register_request(osdc, req);
1729
1730 down_read(&osdc->map_sem);
1731 mutex_lock(&osdc->request_mutex);
c1ea8823
SW		 1732 /*
1733 * a racing kick_requests() may have sent the message for us
1734 * while we dropped request_mutex above, so only send now if
1735 * the request still han't been touched yet.
1736 */
1737 if (req->r_sent == 0) {
38d6453c 1738 rc = __map_request(osdc, req, 0);
9d6fcb08
SW		 1739 if (rc < 0) {
1740 if (nofail) {
1741 dout("osdc_start_request failed map, "
1742 " will retry %lld\n", req->r_tid);
1743 rc = 0;
1744 }
234af26f 1745 goto out_unlock;
9d6fcb08 1746 }
6f6c7006
SW		 1747 if (req->r_osd == NULL) {
1748 dout("send_request %p no up osds in pg\n", req);
1749 ceph_monc_request_next_osdmap(&osdc->client->monc);
1750 } else {
56e925b6 1751 __send_request(osdc, req);
f24e9980 1752 }
56e925b6 1753 rc = 0;
f24e9980 1754 }
234af26f
DC		 1755
1756out_unlock:
f24e9980
SW		 1757 mutex_unlock(&osdc->request_mutex);
1758 up_read(&osdc->map_sem);
1759 return rc;
1760}
3d14c5d2 1761EXPORT_SYMBOL(ceph_osdc_start_request);
f24e9980
SW		 1762
1763/*
1764 * wait for a request to complete
1765 */
1766int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
1767 struct ceph_osd_request *req)
1768{
1769 int rc;
1770
1771 rc = wait_for_completion_interruptible(&req->r_completion);
1772 if (rc < 0) {
1773 mutex_lock(&osdc->request_mutex);
1774 __cancel_request(req);
529cfcc4 1775 __unregister_request(osdc, req);
f24e9980 1776 mutex_unlock(&osdc->request_mutex);
25845472 1777 complete_request(req);
529cfcc4 1778 dout("wait_request tid %llu canceled/timed out\n", req->r_tid);
f24e9980
SW		 1779 return rc;
1780 }
1781
1782 dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result);
1783 return req->r_result;
1784}
3d14c5d2 1785EXPORT_SYMBOL(ceph_osdc_wait_request);
f24e9980
SW		 1786
1787/*
1788 * sync - wait for all in-flight requests to flush. avoid starvation.
1789 */
1790void ceph_osdc_sync(struct ceph_osd_client *osdc)
1791{
1792 struct ceph_osd_request *req;
1793 u64 last_tid, next_tid = 0;
1794
1795 mutex_lock(&osdc->request_mutex);
1796 last_tid = osdc->last_tid;
1797 while (1) {
1798 req = __lookup_request_ge(osdc, next_tid);
1799 if (!req)
1800 break;
1801 if (req->r_tid > last_tid)
1802 break;
1803
1804 next_tid = req->r_tid + 1;
1805 if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0)
1806 continue;
1807
1808 ceph_osdc_get_request(req);
1809 mutex_unlock(&osdc->request_mutex);
1810 dout("sync waiting on tid %llu (last is %llu)\n",
1811 req->r_tid, last_tid);
1812 wait_for_completion(&req->r_safe_completion);
1813 mutex_lock(&osdc->request_mutex);
1814 ceph_osdc_put_request(req);
1815 }
1816 mutex_unlock(&osdc->request_mutex);
1817 dout("sync done (thru tid %llu)\n", last_tid);
1818}
3d14c5d2 1819EXPORT_SYMBOL(ceph_osdc_sync);
f24e9980
SW		 1820
1821/*
1822 * init, shutdown
1823 */
1824int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
1825{
1826 int err;
1827
1828 dout("init\n");
1829 osdc->client = client;
1830 osdc->osdmap = NULL;
1831 init_rwsem(&osdc->map_sem);
1832 init_completion(&osdc->map_waiters);
1833 osdc->last_requested_map = 0;
1834 mutex_init(&osdc->request_mutex);
f24e9980
SW		 1835 osdc->last_tid = 0;
1836 osdc->osds = RB_ROOT;
f5a2041b 1837 INIT_LIST_HEAD(&osdc->osd_lru);
f24e9980 1838 osdc->requests = RB_ROOT;
422d2cb8 1839 INIT_LIST_HEAD(&osdc->req_lru);
6f6c7006
SW		 1840 INIT_LIST_HEAD(&osdc->req_unsent);
1841 INIT_LIST_HEAD(&osdc->req_notarget);
a40c4f10 1842 INIT_LIST_HEAD(&osdc->req_linger);
f24e9980
SW		 1843 osdc->num_requests = 0;
1844 INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
f5a2041b 1845 INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
a40c4f10
YS		 1846 spin_lock_init(&osdc->event_lock);
1847 osdc->event_tree = RB_ROOT;
1848 osdc->event_count = 0;
f5a2041b
YS		 1849
1850 schedule_delayed_work(&osdc->osds_timeout_work,
3d14c5d2 1851 round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
f24e9980 1852
5f44f142 1853 err = -ENOMEM;
f24e9980
SW		 1854 osdc->req_mempool = mempool_create_kmalloc_pool(10,
1855 sizeof(struct ceph_osd_request));
1856 if (!osdc->req_mempool)
5f44f142 1857 goto out;
f24e9980 1858
d50b409f
SW		 1859 err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
1860 OSD_OP_FRONT_LEN, 10, true,
4f48280e 1861 "osd_op");
f24e9980 1862 if (err < 0)
5f44f142 1863 goto out_mempool;
d50b409f 1864 err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
4f48280e
SW		 1865 OSD_OPREPLY_FRONT_LEN, 10, true,
1866 "osd_op_reply");
c16e7869
SW		 1867 if (err < 0)
1868 goto out_msgpool;
a40c4f10
YS		 1869
1870 osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
1871 if (IS_ERR(osdc->notify_wq)) {
1872 err = PTR_ERR(osdc->notify_wq);
1873 osdc->notify_wq = NULL;
1874 goto out_msgpool;
1875 }
f24e9980 1876 return 0;
5f44f142 1877
c16e7869
SW		 1878out_msgpool:
1879 ceph_msgpool_destroy(&osdc->msgpool_op);
5f44f142
SW		 1880out_mempool:
1881 mempool_destroy(osdc->req_mempool);
1882out:
1883 return err;
f24e9980 1884}
3d14c5d2 1885EXPORT_SYMBOL(ceph_osdc_init);
f24e9980
SW		 1886
1887void ceph_osdc_stop(struct ceph_osd_client *osdc)
1888{
a40c4f10
YS		 1889 flush_workqueue(osdc->notify_wq);
1890 destroy_workqueue(osdc->notify_wq);
f24e9980 1891 cancel_delayed_work_sync(&osdc->timeout_work);
f5a2041b 1892 cancel_delayed_work_sync(&osdc->osds_timeout_work);
f24e9980
SW		 1893 if (osdc->osdmap) {
1894 ceph_osdmap_destroy(osdc->osdmap);
1895 osdc->osdmap = NULL;
1896 }
aca420bc 1897 remove_all_osds(osdc);
f24e9980
SW		 1898 mempool_destroy(osdc->req_mempool);
1899 ceph_msgpool_destroy(&osdc->msgpool_op);
c16e7869 1900 ceph_msgpool_destroy(&osdc->msgpool_op_reply);
f24e9980 1901}
3d14c5d2 1902EXPORT_SYMBOL(ceph_osdc_stop);
f24e9980
SW		 1903
1904/*
1905 * Read some contiguous pages. If we cross a stripe boundary, shorten
1906 * *plen. Return number of bytes read, or error.
1907 */
1908int ceph_osdc_readpages(struct ceph_osd_client *osdc,
1909 struct ceph_vino vino, struct ceph_file_layout *layout,
1910 u64 off, u64 *plen,
1911 u32 truncate_seq, u64 truncate_size,
b7495fc2 1912 struct page **pages, int num_pages, int page_align)
f24e9980
SW		 1913{
1914 struct ceph_osd_request *req;
1915 int rc = 0;
1916
1917 dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino,
1918 vino.snap, off, *plen);
1919 req = ceph_osdc_new_request(osdc, layout, vino, off, plen,
1920 CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ,
1921 NULL, 0, truncate_seq, truncate_size, NULL,
b7495fc2 1922 false, 1, page_align);
a79832f2
SW		 1923 if (!req)
1924 return -ENOMEM;
f24e9980
SW		 1925
1926 /* it may be a short read due to an object boundary */
1927 req->r_pages = pages;
f24e9980 1928
b7495fc2
SW		 1929 dout("readpages final extent is %llu~%llu (%d pages align %d)\n",
1930 off, *plen, req->r_num_pages, page_align);
f24e9980
SW		 1931
1932 rc = ceph_osdc_start_request(osdc, req, false);
1933 if (!rc)
1934 rc = ceph_osdc_wait_request(osdc, req);
1935
1936 ceph_osdc_put_request(req);
1937 dout("readpages result %d\n", rc);
1938 return rc;
1939}
3d14c5d2 1940EXPORT_SYMBOL(ceph_osdc_readpages);
f24e9980
SW		 1941
1942/*
1943 * do a synchronous write on N pages
1944 */
1945int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino,
1946 struct ceph_file_layout *layout,
1947 struct ceph_snap_context *snapc,
1948 u64 off, u64 len,
1949 u32 truncate_seq, u64 truncate_size,
1950 struct timespec *mtime,
1951 struct page **pages, int num_pages,
1952 int flags, int do_sync, bool nofail)
1953{
1954 struct ceph_osd_request *req;
1955 int rc = 0;
b7495fc2 1956 int page_align = off & ~PAGE_MASK;
f24e9980
SW		 1957
1958 BUG_ON(vino.snap != CEPH_NOSNAP);
1959 req = ceph_osdc_new_request(osdc, layout, vino, off, &len,
1960 CEPH_OSD_OP_WRITE,
1961 flags | CEPH_OSD_FLAG_ONDISK |
1962 CEPH_OSD_FLAG_WRITE,
1963 snapc, do_sync,
1964 truncate_seq, truncate_size, mtime,
b7495fc2 1965 nofail, 1, page_align);
a79832f2
SW		 1966 if (!req)
1967 return -ENOMEM;
f24e9980
SW		 1968
1969 /* it may be a short write due to an object boundary */
1970 req->r_pages = pages;
f24e9980
SW		 1971 dout("writepages %llu~%llu (%d pages)\n", off, len,
1972 req->r_num_pages);
1973
1974 rc = ceph_osdc_start_request(osdc, req, nofail);
1975 if (!rc)
1976 rc = ceph_osdc_wait_request(osdc, req);
1977
1978 ceph_osdc_put_request(req);
1979 if (rc == 0)
1980 rc = len;
1981 dout("writepages result %d\n", rc);
1982 return rc;
1983}
3d14c5d2 1984EXPORT_SYMBOL(ceph_osdc_writepages);
f24e9980
SW		 1985
1986/*
1987 * handle incoming message
1988 */
1989static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
1990{
1991 struct ceph_osd *osd = con->private;
32c895e7 1992 struct ceph_osd_client *osdc;
f24e9980
SW		 1993 int type = le16_to_cpu(msg->hdr.type);
1994
1995 if (!osd)
4a32f93d 1996 goto out;
32c895e7 1997 osdc = osd->o_osdc;
f24e9980
SW		 1998
1999 switch (type) {
2000 case CEPH_MSG_OSD_MAP:
2001 ceph_osdc_handle_map(osdc, msg);
2002 break;
2003 case CEPH_MSG_OSD_OPREPLY:
350b1c32 2004 handle_reply(osdc, msg, con);
f24e9980 2005 break;
a40c4f10
YS		 2006 case CEPH_MSG_WATCH_NOTIFY:
2007 handle_watch_notify(osdc, msg);
2008 break;
f24e9980
SW		 2009
2010 default:
2011 pr_err("received unknown message type %d %s\n", type,
2012 ceph_msg_type_name(type));
2013 }
4a32f93d 2014out:
f24e9980
SW		 2015 ceph_msg_put(msg);
2016}
2017
5b3a4db3 2018/*
21b667f6
SW		 2019 * lookup and return message for incoming reply. set up reply message
2020 * pages.
5b3a4db3
SW		 2021 */
2022static struct ceph_msg *get_reply(struct ceph_connection *con,
2450418c
YS		 2023 struct ceph_msg_header *hdr,
2024 int *skip)
f24e9980
SW		 2025{
2026 struct ceph_osd *osd = con->private;
2027 struct ceph_osd_client *osdc = osd->o_osdc;
2450418c 2028 struct ceph_msg *m;
0547a9b3 2029 struct ceph_osd_request *req;
5b3a4db3
SW		 2030 int front = le32_to_cpu(hdr->front_len);
2031 int data_len = le32_to_cpu(hdr->data_len);
0547a9b3 2032 u64 tid;
f24e9980 2033
0547a9b3
YS		 2034 tid = le64_to_cpu(hdr->tid);
2035 mutex_lock(&osdc->request_mutex);
2036 req = __lookup_request(osdc, tid);
2037 if (!req) {
2038 *skip = 1;
2039 m = NULL;
756a16a5
SW		 2040 dout("get_reply unknown tid %llu from osd%d\n", tid,
2041 osd->o_osd);
0547a9b3
YS		 2042 goto out;
2043 }
c16e7869
SW		 2044
2045 if (req->r_con_filling_msg) {
8921d114 2046 dout("%s revoking msg %p from old con %p\n", __func__,
c16e7869 2047 req->r_reply, req->r_con_filling_msg);
8921d114 2048 ceph_msg_revoke_incoming(req->r_reply);
0d47766f 2049 req->r_con_filling_msg->ops->put(req->r_con_filling_msg);
6f46cb29 2050 req->r_con_filling_msg = NULL;
0547a9b3
YS		 2051 }
2052
c16e7869
SW		 2053 if (front > req->r_reply->front.iov_len) {
2054 pr_warning("get_reply front %d > preallocated %d\n",
2055 front, (int)req->r_reply->front.iov_len);
b61c2763 2056 m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS, false);
a79832f2 2057 if (!m)
c16e7869
SW		 2058 goto out;
2059 ceph_msg_put(req->r_reply);
2060 req->r_reply = m;
2061 }
2062 m = ceph_msg_get(req->r_reply);
2063
0547a9b3 2064 if (data_len > 0) {
b7495fc2 2065 int want = calc_pages_for(req->r_page_alignment, data_len);
21b667f6
SW		 2066
2067 if (unlikely(req->r_num_pages < want)) {
9bb0ce2b
SW		 2068 pr_warning("tid %lld reply has %d bytes %d pages, we"
2069 " had only %d pages ready\n", tid, data_len,
2070 want, req->r_num_pages);
0547a9b3
YS		 2071 *skip = 1;
2072 ceph_msg_put(m);
a79832f2 2073 m = NULL;
21b667f6 2074 goto out;
0547a9b3 2075 }
21b667f6
SW		 2076 m->pages = req->r_pages;
2077 m->nr_pages = req->r_num_pages;
c5c6b19d 2078 m->page_alignment = req->r_page_alignment;
68b4476b
YS		 2079#ifdef CONFIG_BLOCK
2080 m->bio = req->r_bio;
2081#endif
0547a9b3 2082 }
5b3a4db3 2083 *skip = 0;
0d47766f 2084 req->r_con_filling_msg = con->ops->get(con);
c16e7869 2085 dout("get_reply tid %lld %p\n", tid, m);
0547a9b3
YS		 2086
2087out:
2088 mutex_unlock(&osdc->request_mutex);
2450418c 2089 return m;
5b3a4db3
SW		 2090
2091}
2092
2093static struct ceph_msg *alloc_msg(struct ceph_connection *con,
2094 struct ceph_msg_header *hdr,
2095 int *skip)
2096{
2097 struct ceph_osd *osd = con->private;
2098 int type = le16_to_cpu(hdr->type);
2099 int front = le32_to_cpu(hdr->front_len);
2100
1c20f2d2 2101 *skip = 0;
5b3a4db3
SW		 2102 switch (type) {
2103 case CEPH_MSG_OSD_MAP:
a40c4f10 2104 case CEPH_MSG_WATCH_NOTIFY:
b61c2763 2105 return ceph_msg_new(type, front, GFP_NOFS, false);
5b3a4db3
SW		 2106 case CEPH_MSG_OSD_OPREPLY:
2107 return get_reply(con, hdr, skip);
2108 default:
2109 pr_info("alloc_msg unexpected msg type %d from osd%d\n", type,
2110 osd->o_osd);
2111 *skip = 1;
2112 return NULL;
2113 }
f24e9980
SW		 2114}
2115
2116/*
2117 * Wrappers to refcount containing ceph_osd struct
2118 */
2119static struct ceph_connection *get_osd_con(struct ceph_connection *con)
2120{
2121 struct ceph_osd *osd = con->private;
2122 if (get_osd(osd))
2123 return con;
2124 return NULL;
2125}
2126
2127static void put_osd_con(struct ceph_connection *con)
2128{
2129 struct ceph_osd *osd = con->private;
2130 put_osd(osd);
2131}
2132
4e7a5dcd
SW		 2133/*
2134 * authentication
2135 */
a3530df3
AE		 2136/*
2137 * Note: returned pointer is the address of a structure that's
2138 * managed separately. Caller must *not* attempt to free it.
2139 */
2140static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 2141 int *proto, int force_new)
4e7a5dcd
SW		 2142{
2143 struct ceph_osd *o = con->private;
2144 struct ceph_osd_client *osdc = o->o_osdc;
2145 struct ceph_auth_client *ac = osdc->client->monc.auth;
74f1869f 2146 struct ceph_auth_handshake *auth = &o->o_auth;
4e7a5dcd 2147
74f1869f 2148 if (force_new && auth->authorizer) {
a255651d
AE		 2149 if (ac->ops && ac->ops->destroy_authorizer)
2150 ac->ops->destroy_authorizer(ac, auth->authorizer);
74f1869f
AE		 2151 auth->authorizer = NULL;
2152 }
a255651d 2153 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
a3530df3
AE		 2154 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_OSD,
2155 auth);
4e7a5dcd 2156 if (ret)
a3530df3 2157 return ERR_PTR(ret);
4e7a5dcd 2158 }
4e7a5dcd 2159 *proto = ac->protocol;
74f1869f 2160
a3530df3 2161 return auth;
4e7a5dcd
SW		 2162}
2163
2164
2165static int verify_authorizer_reply(struct ceph_connection *con, int len)
2166{
2167 struct ceph_osd *o = con->private;
2168 struct ceph_osd_client *osdc = o->o_osdc;
2169 struct ceph_auth_client *ac = osdc->client->monc.auth;
2170
a255651d
AE		 2171 /*
2172 * XXX If ac->ops or ac->ops->verify_authorizer_reply is null,
2173 * XXX which do we do: succeed or fail?
2174 */
6c4a1915 2175 return ac->ops->verify_authorizer_reply(ac, o->o_auth.authorizer, len);
4e7a5dcd
SW		 2176}
2177
9bd2e6f8
SW		 2178static int invalidate_authorizer(struct ceph_connection *con)
2179{
2180 struct ceph_osd *o = con->private;
2181 struct ceph_osd_client *osdc = o->o_osdc;
2182 struct ceph_auth_client *ac = osdc->client->monc.auth;
2183
a255651d 2184 if (ac->ops && ac->ops->invalidate_authorizer)
9bd2e6f8
SW		 2185 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD);
2186
2187 return ceph_monc_validate_auth(&osdc->client->monc);
2188}
4e7a5dcd 2189
9e32789f 2190static const struct ceph_connection_operations osd_con_ops = {
f24e9980
SW		 2191 .get = get_osd_con,
2192 .put = put_osd_con,
2193 .dispatch = dispatch,
4e7a5dcd
SW		 2194 .get_authorizer = get_authorizer,
2195 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 2196 .invalidate_authorizer = invalidate_authorizer,
f24e9980 2197 .alloc_msg = alloc_msg,
81b024e7 2198 .fault = osd_reset,
f24e9980 2199};
Linux 6.x block layer and io_uring tree(s)