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Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001#include <linux/ceph/ceph_debug.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07002
Sage Weil496e5952010-09-22 19:57:10 -07003#include <linux/fs.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07004#include <linux/wait.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09005#include <linux/slab.h>
Yan, Zheng54008392014-03-29 13:41:15 +08006#include <linux/gfp.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07007#include <linux/sched.h>
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07008#include <linux/debugfs.h>
9#include <linux/seq_file.h>
John Spraydbd0c8b2014-09-09 19:26:01 +010010#include <linux/utsname.h>
Yan, Zheng3e0708b2015-05-22 16:38:02 +080011#include <linux/ratelimit.h>
Sage Weil2f2dc052009-10-06 11:31:09 -070012
Sage Weil2f2dc052009-10-06 11:31:09 -070013#include "super.h"
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070014#include "mds_client.h"
15
Sage Weil1fe60e52012-07-30 16:23:22 -070016#include <linux/ceph/ceph_features.h>
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -070017#include <linux/ceph/messenger.h>
18#include <linux/ceph/decode.h>
19#include <linux/ceph/pagelist.h>
20#include <linux/ceph/auth.h>
21#include <linux/ceph/debugfs.h>
Sage Weil2f2dc052009-10-06 11:31:09 -070022
23/*
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
30 *
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
35 * requests.
36 *
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
40 *
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
46 */
47
Sage Weil20cb34a2010-05-12 15:21:32 -070048struct ceph_reconnect_state {
Yan, Zheng44c99752013-09-22 10:28:10 +080049 int nr_caps;
Sage Weil20cb34a2010-05-12 15:21:32 -070050 struct ceph_pagelist *pagelist;
Yan, Zheng121f22a2016-07-04 22:05:18 +080051 unsigned msg_version;
Sage Weil20cb34a2010-05-12 15:21:32 -070052};
53
Sage Weil2f2dc052009-10-06 11:31:09 -070054static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
56
Tobias Klauser9e327892010-05-20 10:40:19 +020057static const struct ceph_connection_operations mds_con_ops;
Sage Weil2f2dc052009-10-06 11:31:09 -070058
59
60/*
61 * mds reply parsing
62 */
63
64/*
65 * parse individual inode info
66 */
67static int parse_reply_info_in(void **p, void *end,
Sage Weil14303d22010-12-14 17:37:52 -080068 struct ceph_mds_reply_info_in *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +020069 u64 features)
Sage Weil2f2dc052009-10-06 11:31:09 -070070{
71 int err = -EIO;
72
73 info->in = *p;
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
77
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
80 info->symlink = *p;
81 *p += info->symlink_len;
82
Sage Weil14303d22010-12-14 17:37:52 -080083 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
86 else
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88
Sage Weil2f2dc052009-10-06 11:31:09 -070089 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
Yan, Zhengfb01d1f2014-11-14 21:29:55 +080093
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
100 } else
101 info->inline_version = CEPH_INLINE_NONE;
102
Yan, Zheng779fe0f2016-03-07 09:35:06 +0800103 info->pool_ns_len = 0;
104 info->pool_ns_data = NULL;
Yan, Zheng5ea5c5e2016-02-14 18:06:41 +0800105 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
106 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
Yan, Zheng779fe0f2016-03-07 09:35:06 +0800107 if (info->pool_ns_len > 0) {
108 ceph_decode_need(p, end, info->pool_ns_len, bad);
109 info->pool_ns_data = *p;
110 *p += info->pool_ns_len;
111 }
Yan, Zheng5ea5c5e2016-02-14 18:06:41 +0800112 }
113
Sage Weil2f2dc052009-10-06 11:31:09 -0700114 return 0;
115bad:
116 return err;
117}
118
119/*
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
121 * target inode.
122 */
123static int parse_reply_info_trace(void **p, void *end,
Sage Weil14303d22010-12-14 17:37:52 -0800124 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200125 u64 features)
Sage Weil2f2dc052009-10-06 11:31:09 -0700126{
127 int err;
128
129 if (info->head->is_dentry) {
Sage Weil14303d22010-12-14 17:37:52 -0800130 err = parse_reply_info_in(p, end, &info->diri, features);
Sage Weil2f2dc052009-10-06 11:31:09 -0700131 if (err < 0)
132 goto out_bad;
133
134 if (unlikely(*p + sizeof(*info->dirfrag) > end))
135 goto bad;
136 info->dirfrag = *p;
137 *p += sizeof(*info->dirfrag) +
138 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
139 if (unlikely(*p > end))
140 goto bad;
141
142 ceph_decode_32_safe(p, end, info->dname_len, bad);
143 ceph_decode_need(p, end, info->dname_len, bad);
144 info->dname = *p;
145 *p += info->dname_len;
146 info->dlease = *p;
147 *p += sizeof(*info->dlease);
148 }
149
150 if (info->head->is_target) {
Sage Weil14303d22010-12-14 17:37:52 -0800151 err = parse_reply_info_in(p, end, &info->targeti, features);
Sage Weil2f2dc052009-10-06 11:31:09 -0700152 if (err < 0)
153 goto out_bad;
154 }
155
156 if (unlikely(*p != end))
157 goto bad;
158 return 0;
159
160bad:
161 err = -EIO;
162out_bad:
163 pr_err("problem parsing mds trace %d\n", err);
164 return err;
165}
166
167/*
168 * parse readdir results
169 */
170static int parse_reply_info_dir(void **p, void *end,
Sage Weil14303d22010-12-14 17:37:52 -0800171 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200172 u64 features)
Sage Weil2f2dc052009-10-06 11:31:09 -0700173{
174 u32 num, i = 0;
175 int err;
176
177 info->dir_dir = *p;
178 if (*p + sizeof(*info->dir_dir) > end)
179 goto bad;
180 *p += sizeof(*info->dir_dir) +
181 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
182 if (*p > end)
183 goto bad;
184
185 ceph_decode_need(p, end, sizeof(num) + 2, bad);
Sage Weilc89136e2009-10-14 09:59:09 -0700186 num = ceph_decode_32(p);
Yan, Zheng956d39d2016-04-27 17:48:30 +0800187 {
188 u16 flags = ceph_decode_16(p);
189 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
190 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
Yan, Zhengf3c4ebe2016-04-29 11:27:30 +0800191 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
Yan, Zheng956d39d2016-04-27 17:48:30 +0800192 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700193 if (num == 0)
194 goto done;
195
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800196 BUG_ON(!info->dir_entries);
197 if ((unsigned long)(info->dir_entries + num) >
198 (unsigned long)info->dir_entries + info->dir_buf_size) {
Yan, Zheng54008392014-03-29 13:41:15 +0800199 pr_err("dir contents are larger than expected\n");
200 WARN_ON(1);
201 goto bad;
202 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700203
Yan, Zheng54008392014-03-29 13:41:15 +0800204 info->dir_nr = num;
Sage Weil2f2dc052009-10-06 11:31:09 -0700205 while (num) {
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800206 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
Sage Weil2f2dc052009-10-06 11:31:09 -0700207 /* dentry */
208 ceph_decode_need(p, end, sizeof(u32)*2, bad);
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800209 rde->name_len = ceph_decode_32(p);
210 ceph_decode_need(p, end, rde->name_len, bad);
211 rde->name = *p;
212 *p += rde->name_len;
213 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
214 rde->lease = *p;
Sage Weil2f2dc052009-10-06 11:31:09 -0700215 *p += sizeof(struct ceph_mds_reply_lease);
216
217 /* inode */
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800218 err = parse_reply_info_in(p, end, &rde->inode, features);
Sage Weil2f2dc052009-10-06 11:31:09 -0700219 if (err < 0)
220 goto out_bad;
Yan, Zheng8974eeb2016-04-28 15:17:40 +0800221 /* ceph_readdir_prepopulate() will update it */
222 rde->offset = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -0700223 i++;
224 num--;
225 }
226
227done:
228 if (*p != end)
229 goto bad;
230 return 0;
231
232bad:
233 err = -EIO;
234out_bad:
235 pr_err("problem parsing dir contents %d\n", err);
236 return err;
237}
238
239/*
Herb Shiu25933ab2010-12-01 14:14:38 -0800240 * parse fcntl F_GETLK results
241 */
242static int parse_reply_info_filelock(void **p, void *end,
Sage Weil14303d22010-12-14 17:37:52 -0800243 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200244 u64 features)
Herb Shiu25933ab2010-12-01 14:14:38 -0800245{
246 if (*p + sizeof(*info->filelock_reply) > end)
247 goto bad;
248
249 info->filelock_reply = *p;
250 *p += sizeof(*info->filelock_reply);
251
252 if (unlikely(*p != end))
253 goto bad;
254 return 0;
255
256bad:
257 return -EIO;
258}
259
260/*
Sam Lang6e8575f2012-12-28 09:56:46 -0800261 * parse create results
262 */
263static int parse_reply_info_create(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200265 u64 features)
Sam Lang6e8575f2012-12-28 09:56:46 -0800266{
267 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
268 if (*p == end) {
269 info->has_create_ino = false;
270 } else {
271 info->has_create_ino = true;
272 info->ino = ceph_decode_64(p);
273 }
274 }
275
276 if (unlikely(*p != end))
277 goto bad;
278 return 0;
279
280bad:
281 return -EIO;
282}
283
284/*
Herb Shiu25933ab2010-12-01 14:14:38 -0800285 * parse extra results
286 */
287static int parse_reply_info_extra(void **p, void *end,
Sage Weil14303d22010-12-14 17:37:52 -0800288 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200289 u64 features)
Herb Shiu25933ab2010-12-01 14:14:38 -0800290{
Jeff Layton6df8c9d2017-01-12 14:42:41 -0500291 u32 op = le32_to_cpu(info->head->op);
292
293 if (op == CEPH_MDS_OP_GETFILELOCK)
Sage Weil14303d22010-12-14 17:37:52 -0800294 return parse_reply_info_filelock(p, end, info, features);
Jeff Layton6df8c9d2017-01-12 14:42:41 -0500295 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
Sage Weil14303d22010-12-14 17:37:52 -0800296 return parse_reply_info_dir(p, end, info, features);
Jeff Layton6df8c9d2017-01-12 14:42:41 -0500297 else if (op == CEPH_MDS_OP_CREATE)
Sam Lang6e8575f2012-12-28 09:56:46 -0800298 return parse_reply_info_create(p, end, info, features);
299 else
300 return -EIO;
Herb Shiu25933ab2010-12-01 14:14:38 -0800301}
302
303/*
Sage Weil2f2dc052009-10-06 11:31:09 -0700304 * parse entire mds reply
305 */
306static int parse_reply_info(struct ceph_msg *msg,
Sage Weil14303d22010-12-14 17:37:52 -0800307 struct ceph_mds_reply_info_parsed *info,
Ilya Dryomov12b46292013-12-24 21:19:23 +0200308 u64 features)
Sage Weil2f2dc052009-10-06 11:31:09 -0700309{
310 void *p, *end;
311 u32 len;
312 int err;
313
314 info->head = msg->front.iov_base;
315 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
316 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
317
318 /* trace */
319 ceph_decode_32_safe(&p, end, len, bad);
320 if (len > 0) {
Xi Wang32852a82012-01-14 22:20:59 -0500321 ceph_decode_need(&p, end, len, bad);
Sage Weil14303d22010-12-14 17:37:52 -0800322 err = parse_reply_info_trace(&p, p+len, info, features);
Sage Weil2f2dc052009-10-06 11:31:09 -0700323 if (err < 0)
324 goto out_bad;
325 }
326
Herb Shiu25933ab2010-12-01 14:14:38 -0800327 /* extra */
Sage Weil2f2dc052009-10-06 11:31:09 -0700328 ceph_decode_32_safe(&p, end, len, bad);
329 if (len > 0) {
Xi Wang32852a82012-01-14 22:20:59 -0500330 ceph_decode_need(&p, end, len, bad);
Sage Weil14303d22010-12-14 17:37:52 -0800331 err = parse_reply_info_extra(&p, p+len, info, features);
Sage Weil2f2dc052009-10-06 11:31:09 -0700332 if (err < 0)
333 goto out_bad;
334 }
335
336 /* snap blob */
337 ceph_decode_32_safe(&p, end, len, bad);
338 info->snapblob_len = len;
339 info->snapblob = p;
340 p += len;
341
342 if (p != end)
343 goto bad;
344 return 0;
345
346bad:
347 err = -EIO;
348out_bad:
349 pr_err("mds parse_reply err %d\n", err);
350 return err;
351}
352
353static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
354{
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800355 if (!info->dir_entries)
Yan, Zheng54008392014-03-29 13:41:15 +0800356 return;
Yan, Zheng2a5beea2016-04-28 09:37:39 +0800357 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
Sage Weil2f2dc052009-10-06 11:31:09 -0700358}
359
360
361/*
362 * sessions
363 */
John Spraya687eca2014-09-19 13:51:08 +0100364const char *ceph_session_state_name(int s)
Sage Weil2f2dc052009-10-06 11:31:09 -0700365{
366 switch (s) {
367 case CEPH_MDS_SESSION_NEW: return "new";
368 case CEPH_MDS_SESSION_OPENING: return "opening";
369 case CEPH_MDS_SESSION_OPEN: return "open";
370 case CEPH_MDS_SESSION_HUNG: return "hung";
371 case CEPH_MDS_SESSION_CLOSING: return "closing";
Sage Weil44ca18f2010-02-15 12:08:46 -0800372 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
Sage Weil2f2dc052009-10-06 11:31:09 -0700373 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
Yan, Zhengfcff4152016-09-14 16:39:51 +0800374 case CEPH_MDS_SESSION_REJECTED: return "rejected";
Sage Weil2f2dc052009-10-06 11:31:09 -0700375 default: return "???";
376 }
377}
378
379static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
380{
381 if (atomic_inc_not_zero(&s->s_ref)) {
382 dout("mdsc get_session %p %d -> %d\n", s,
383 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
384 return s;
385 } else {
386 dout("mdsc get_session %p 0 -- FAIL", s);
387 return NULL;
388 }
389}
390
391void ceph_put_mds_session(struct ceph_mds_session *s)
392{
393 dout("mdsc put_session %p %d -> %d\n", s,
394 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800395 if (atomic_dec_and_test(&s->s_ref)) {
Alex Elder6c4a1912012-05-16 15:16:38 -0500396 if (s->s_auth.authorizer)
Ilya Dryomov6c1ea262016-04-11 19:34:49 +0200397 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
Sage Weil2f2dc052009-10-06 11:31:09 -0700398 kfree(s);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800399 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700400}
401
402/*
403 * called under mdsc->mutex
404 */
405struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
406 int mds)
407{
408 struct ceph_mds_session *session;
409
410 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
411 return NULL;
412 session = mdsc->sessions[mds];
413 dout("lookup_mds_session %p %d\n", session,
414 atomic_read(&session->s_ref));
415 get_session(session);
416 return session;
417}
418
419static bool __have_session(struct ceph_mds_client *mdsc, int mds)
420{
421 if (mds >= mdsc->max_sessions)
422 return false;
423 return mdsc->sessions[mds];
424}
425
Sage Weil2600d2d2010-02-22 15:12:16 -0800426static int __verify_registered_session(struct ceph_mds_client *mdsc,
427 struct ceph_mds_session *s)
428{
429 if (s->s_mds >= mdsc->max_sessions ||
430 mdsc->sessions[s->s_mds] != s)
431 return -ENOENT;
432 return 0;
433}
434
Sage Weil2f2dc052009-10-06 11:31:09 -0700435/*
436 * create+register a new session for given mds.
437 * called under mdsc->mutex.
438 */
439static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
440 int mds)
441{
442 struct ceph_mds_session *s;
443
Nathaniel Yazdanic338c072013-08-04 21:04:30 -0700444 if (mds >= mdsc->mdsmap->m_max_mds)
445 return ERR_PTR(-EINVAL);
446
Sage Weil2f2dc052009-10-06 11:31:09 -0700447 s = kzalloc(sizeof(*s), GFP_NOFS);
Dan Carpenter4736b002010-03-20 15:30:16 +0300448 if (!s)
449 return ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -0700450 s->s_mdsc = mdsc;
451 s->s_mds = mds;
452 s->s_state = CEPH_MDS_SESSION_NEW;
453 s->s_ttl = 0;
454 s->s_seq = 0;
455 mutex_init(&s->s_mutex);
456
Sage Weilb7a9e5d2012-06-27 12:24:08 -0700457 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
Sage Weil2f2dc052009-10-06 11:31:09 -0700458
Alex Elderd8fb02a2012-01-12 17:48:10 -0800459 spin_lock_init(&s->s_gen_ttl_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -0700460 s->s_cap_gen = 0;
Alex Elder1ce208a2012-01-12 17:48:11 -0800461 s->s_cap_ttl = jiffies - 1;
Alex Elderd8fb02a2012-01-12 17:48:10 -0800462
463 spin_lock_init(&s->s_cap_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -0700464 s->s_renew_requested = 0;
465 s->s_renew_seq = 0;
466 INIT_LIST_HEAD(&s->s_caps);
467 s->s_nr_caps = 0;
Sage Weil5dacf092009-12-21 20:40:34 -0800468 s->s_trim_caps = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -0700469 atomic_set(&s->s_ref, 1);
470 INIT_LIST_HEAD(&s->s_waiting);
471 INIT_LIST_HEAD(&s->s_unsafe);
472 s->s_num_cap_releases = 0;
Yan, Zheng99a9c272013-09-22 11:08:14 +0800473 s->s_cap_reconnect = 0;
Sage Weil7c1332b2010-02-16 11:39:45 -0800474 s->s_cap_iterator = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700475 INIT_LIST_HEAD(&s->s_cap_releases);
Sage Weil2f2dc052009-10-06 11:31:09 -0700476 INIT_LIST_HEAD(&s->s_cap_flushing);
Sage Weil2f2dc052009-10-06 11:31:09 -0700477
478 dout("register_session mds%d\n", mds);
479 if (mds >= mdsc->max_sessions) {
480 int newmax = 1 << get_count_order(mds+1);
481 struct ceph_mds_session **sa;
482
483 dout("register_session realloc to %d\n", newmax);
484 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
485 if (sa == NULL)
Sage Weil42ce56e2009-11-18 11:22:36 -0800486 goto fail_realloc;
Sage Weil2f2dc052009-10-06 11:31:09 -0700487 if (mdsc->sessions) {
488 memcpy(sa, mdsc->sessions,
489 mdsc->max_sessions * sizeof(void *));
490 kfree(mdsc->sessions);
491 }
492 mdsc->sessions = sa;
493 mdsc->max_sessions = newmax;
494 }
495 mdsc->sessions[mds] = s;
Yan, Zheng86d8f672015-01-09 17:00:42 +0800496 atomic_inc(&mdsc->num_sessions);
Sage Weil2f2dc052009-10-06 11:31:09 -0700497 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
Sage Weil42ce56e2009-11-18 11:22:36 -0800498
Sage Weilb7a9e5d2012-06-27 12:24:08 -0700499 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
500 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
Sage Weil42ce56e2009-11-18 11:22:36 -0800501
Sage Weil2f2dc052009-10-06 11:31:09 -0700502 return s;
Sage Weil42ce56e2009-11-18 11:22:36 -0800503
504fail_realloc:
505 kfree(s);
506 return ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -0700507}
508
509/*
510 * called under mdsc->mutex
511 */
Sage Weil2600d2d2010-02-22 15:12:16 -0800512static void __unregister_session(struct ceph_mds_client *mdsc,
Sage Weil42ce56e2009-11-18 11:22:36 -0800513 struct ceph_mds_session *s)
Sage Weil2f2dc052009-10-06 11:31:09 -0700514{
Sage Weil2600d2d2010-02-22 15:12:16 -0800515 dout("__unregister_session mds%d %p\n", s->s_mds, s);
516 BUG_ON(mdsc->sessions[s->s_mds] != s);
Sage Weil42ce56e2009-11-18 11:22:36 -0800517 mdsc->sessions[s->s_mds] = NULL;
518 ceph_con_close(&s->s_con);
519 ceph_put_mds_session(s);
Yan, Zheng86d8f672015-01-09 17:00:42 +0800520 atomic_dec(&mdsc->num_sessions);
Sage Weil2f2dc052009-10-06 11:31:09 -0700521}
522
523/*
524 * drop session refs in request.
525 *
526 * should be last request ref, or hold mdsc->mutex
527 */
528static void put_request_session(struct ceph_mds_request *req)
529{
530 if (req->r_session) {
531 ceph_put_mds_session(req->r_session);
532 req->r_session = NULL;
533 }
534}
535
Sage Weil153c8e62009-12-07 12:31:09 -0800536void ceph_mdsc_release_request(struct kref *kref)
Sage Weil2f2dc052009-10-06 11:31:09 -0700537{
Sage Weil153c8e62009-12-07 12:31:09 -0800538 struct ceph_mds_request *req = container_of(kref,
539 struct ceph_mds_request,
540 r_kref);
Yan, Zheng54008392014-03-29 13:41:15 +0800541 destroy_reply_info(&req->r_reply_info);
Sage Weil153c8e62009-12-07 12:31:09 -0800542 if (req->r_request)
543 ceph_msg_put(req->r_request);
Yan, Zheng54008392014-03-29 13:41:15 +0800544 if (req->r_reply)
Sage Weil153c8e62009-12-07 12:31:09 -0800545 ceph_msg_put(req->r_reply);
Sage Weil153c8e62009-12-07 12:31:09 -0800546 if (req->r_inode) {
Sage Weil41b02e12011-07-26 11:31:14 -0700547 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
Sage Weil153c8e62009-12-07 12:31:09 -0800548 iput(req->r_inode);
549 }
550 if (req->r_locked_dir)
Sage Weil41b02e12011-07-26 11:31:14 -0700551 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
SF Markus Elfringe96a6502014-11-02 15:20:59 +0100552 iput(req->r_target_inode);
Sage Weil153c8e62009-12-07 12:31:09 -0800553 if (req->r_dentry)
554 dput(req->r_dentry);
Sage Weil844d87c2013-02-05 13:40:09 -0800555 if (req->r_old_dentry)
556 dput(req->r_old_dentry);
557 if (req->r_old_dentry_dir) {
Sage Weil41b02e12011-07-26 11:31:14 -0700558 /*
559 * track (and drop pins for) r_old_dentry_dir
560 * separately, since r_old_dentry's d_parent may have
561 * changed between the dir mutex being dropped and
562 * this request being freed.
563 */
564 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
565 CEPH_CAP_PIN);
Sage Weil41b02e12011-07-26 11:31:14 -0700566 iput(req->r_old_dentry_dir);
Sage Weil153c8e62009-12-07 12:31:09 -0800567 }
568 kfree(req->r_path1);
569 kfree(req->r_path2);
Yan, Zheng25e6bae2014-09-16 19:15:28 +0800570 if (req->r_pagelist)
571 ceph_pagelist_release(req->r_pagelist);
Sage Weil153c8e62009-12-07 12:31:09 -0800572 put_request_session(req);
Yehuda Sadeh37151662010-06-17 16:16:12 -0700573 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
Sage Weil153c8e62009-12-07 12:31:09 -0800574 kfree(req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700575}
576
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200577DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
578
Sage Weil2f2dc052009-10-06 11:31:09 -0700579/*
580 * lookup session, bump ref if found.
581 *
582 * called under mdsc->mutex.
583 */
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200584static struct ceph_mds_request *
585lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
Sage Weil2f2dc052009-10-06 11:31:09 -0700586{
587 struct ceph_mds_request *req;
Sage Weil44ca18f2010-02-15 12:08:46 -0800588
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200589 req = lookup_request(&mdsc->request_tree, tid);
590 if (req)
591 ceph_mdsc_get_request(req);
Sage Weil44ca18f2010-02-15 12:08:46 -0800592
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200593 return req;
Sage Weil2f2dc052009-10-06 11:31:09 -0700594}
595
596/*
597 * Register an in-flight request, and assign a tid. Link to directory
598 * are modifying (if any).
599 *
600 * Called under mdsc->mutex.
601 */
602static void __register_request(struct ceph_mds_client *mdsc,
603 struct ceph_mds_request *req,
604 struct inode *dir)
605{
606 req->r_tid = ++mdsc->last_tid;
607 if (req->r_num_caps)
Yehuda Sadeh37151662010-06-17 16:16:12 -0700608 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
609 req->r_num_caps);
Sage Weil2f2dc052009-10-06 11:31:09 -0700610 dout("__register_request %p tid %lld\n", req, req->r_tid);
611 ceph_mdsc_get_request(req);
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200612 insert_request(&mdsc->request_tree, req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700613
Sage Weilcb4276c2010-11-08 07:28:52 -0800614 req->r_uid = current_fsuid();
615 req->r_gid = current_fsgid();
616
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +0800617 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
618 mdsc->oldest_tid = req->r_tid;
619
Sage Weil2f2dc052009-10-06 11:31:09 -0700620 if (dir) {
Sage Weil3b663782011-05-18 16:12:12 -0700621 ihold(dir);
Sage Weil2f2dc052009-10-06 11:31:09 -0700622 req->r_unsafe_dir = dir;
Sage Weil2f2dc052009-10-06 11:31:09 -0700623 }
624}
625
626static void __unregister_request(struct ceph_mds_client *mdsc,
627 struct ceph_mds_request *req)
628{
629 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +0800630
631 if (req->r_tid == mdsc->oldest_tid) {
632 struct rb_node *p = rb_next(&req->r_node);
633 mdsc->oldest_tid = 0;
634 while (p) {
635 struct ceph_mds_request *next_req =
636 rb_entry(p, struct ceph_mds_request, r_node);
637 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
638 mdsc->oldest_tid = next_req->r_tid;
639 break;
640 }
641 p = rb_next(p);
642 }
643 }
644
Ilya Dryomovfcd00b62016-04-28 16:07:22 +0200645 erase_request(&mdsc->request_tree, req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700646
Yan, Zheng4c06ace2015-10-27 17:18:00 +0800647 if (req->r_unsafe_dir && req->r_got_unsafe) {
Sage Weil2f2dc052009-10-06 11:31:09 -0700648 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
Sage Weil2f2dc052009-10-06 11:31:09 -0700649 spin_lock(&ci->i_unsafe_lock);
650 list_del_init(&req->r_unsafe_dir_item);
651 spin_unlock(&ci->i_unsafe_lock);
Yan, Zheng4c06ace2015-10-27 17:18:00 +0800652 }
Yan, Zheng68cd5b42015-10-27 18:36:06 +0800653 if (req->r_target_inode && req->r_got_unsafe) {
654 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
655 spin_lock(&ci->i_unsafe_lock);
656 list_del_init(&req->r_unsafe_target_item);
657 spin_unlock(&ci->i_unsafe_lock);
658 }
Sage Weil3b663782011-05-18 16:12:12 -0700659
Yan, Zheng4c06ace2015-10-27 17:18:00 +0800660 if (req->r_unsafe_dir) {
Sage Weil3b663782011-05-18 16:12:12 -0700661 iput(req->r_unsafe_dir);
662 req->r_unsafe_dir = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700663 }
Sage Weil94aa8ae2010-03-28 21:22:50 -0700664
Yan, Zhengfc55d2c2013-10-31 09:10:47 +0800665 complete_all(&req->r_safe_completion);
666
Sage Weil94aa8ae2010-03-28 21:22:50 -0700667 ceph_mdsc_put_request(req);
Sage Weil2f2dc052009-10-06 11:31:09 -0700668}
669
670/*
671 * Choose mds to send request to next. If there is a hint set in the
672 * request (e.g., due to a prior forward hint from the mds), use that.
673 * Otherwise, consult frag tree and/or caps to identify the
674 * appropriate mds. If all else fails, choose randomly.
675 *
676 * Called under mdsc->mutex.
677 */
H Hartley Sweeten7fd7d102011-09-23 13:22:11 -0700678static struct dentry *get_nonsnap_parent(struct dentry *dentry)
Sage Weileb6bb1c2010-08-16 09:21:27 -0700679{
Sage Weild79698d2011-07-26 11:31:26 -0700680 /*
681 * we don't need to worry about protecting the d_parent access
682 * here because we never renaming inside the snapped namespace
683 * except to resplice to another snapdir, and either the old or new
684 * result is a valid result.
685 */
David Howells2b0143b2015-03-17 22:25:59 +0000686 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
Sage Weileb6bb1c2010-08-16 09:21:27 -0700687 dentry = dentry->d_parent;
688 return dentry;
689}
690
Sage Weil2f2dc052009-10-06 11:31:09 -0700691static int __choose_mds(struct ceph_mds_client *mdsc,
692 struct ceph_mds_request *req)
693{
694 struct inode *inode;
695 struct ceph_inode_info *ci;
696 struct ceph_cap *cap;
697 int mode = req->r_direct_mode;
698 int mds = -1;
699 u32 hash = req->r_direct_hash;
700 bool is_hash = req->r_direct_is_hash;
701
702 /*
703 * is there a specific mds we should try? ignore hint if we have
704 * no session and the mds is not up (active or recovering).
705 */
706 if (req->r_resend_mds >= 0 &&
707 (__have_session(mdsc, req->r_resend_mds) ||
708 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
709 dout("choose_mds using resend_mds mds%d\n",
710 req->r_resend_mds);
711 return req->r_resend_mds;
712 }
713
714 if (mode == USE_RANDOM_MDS)
715 goto random;
716
717 inode = NULL;
718 if (req->r_inode) {
719 inode = req->r_inode;
720 } else if (req->r_dentry) {
Sage Weild79698d2011-07-26 11:31:26 -0700721 /* ignore race with rename; old or new d_parent is okay */
722 struct dentry *parent = req->r_dentry->d_parent;
David Howells2b0143b2015-03-17 22:25:59 +0000723 struct inode *dir = d_inode(parent);
Sage Weileb6bb1c2010-08-16 09:21:27 -0700724
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -0700725 if (dir->i_sb != mdsc->fsc->sb) {
Sage Weileb6bb1c2010-08-16 09:21:27 -0700726 /* not this fs! */
David Howells2b0143b2015-03-17 22:25:59 +0000727 inode = d_inode(req->r_dentry);
Sage Weileb6bb1c2010-08-16 09:21:27 -0700728 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
729 /* direct snapped/virtual snapdir requests
730 * based on parent dir inode */
Sage Weild79698d2011-07-26 11:31:26 -0700731 struct dentry *dn = get_nonsnap_parent(parent);
David Howells2b0143b2015-03-17 22:25:59 +0000732 inode = d_inode(dn);
Sage Weileb6bb1c2010-08-16 09:21:27 -0700733 dout("__choose_mds using nonsnap parent %p\n", inode);
Yan, Zhengca18bed2013-11-22 14:21:44 +0800734 } else {
Sage Weileb6bb1c2010-08-16 09:21:27 -0700735 /* dentry target */
David Howells2b0143b2015-03-17 22:25:59 +0000736 inode = d_inode(req->r_dentry);
Yan, Zhengca18bed2013-11-22 14:21:44 +0800737 if (!inode || mode == USE_AUTH_MDS) {
738 /* dir + name */
739 inode = dir;
740 hash = ceph_dentry_hash(dir, req->r_dentry);
741 is_hash = true;
742 }
Sage Weil2f2dc052009-10-06 11:31:09 -0700743 }
744 }
Sage Weileb6bb1c2010-08-16 09:21:27 -0700745
Sage Weil2f2dc052009-10-06 11:31:09 -0700746 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
747 (int)hash, mode);
748 if (!inode)
749 goto random;
750 ci = ceph_inode(inode);
751
752 if (is_hash && S_ISDIR(inode->i_mode)) {
753 struct ceph_inode_frag frag;
754 int found;
755
756 ceph_choose_frag(ci, hash, &frag, &found);
757 if (found) {
758 if (mode == USE_ANY_MDS && frag.ndist > 0) {
759 u8 r;
760
761 /* choose a random replica */
762 get_random_bytes(&r, 1);
763 r %= frag.ndist;
764 mds = frag.dist[r];
765 dout("choose_mds %p %llx.%llx "
766 "frag %u mds%d (%d/%d)\n",
767 inode, ceph_vinop(inode),
Sage Weild66bbd42011-01-21 21:16:46 -0800768 frag.frag, mds,
Sage Weil2f2dc052009-10-06 11:31:09 -0700769 (int)r, frag.ndist);
Sage Weild66bbd42011-01-21 21:16:46 -0800770 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
771 CEPH_MDS_STATE_ACTIVE)
772 return mds;
Sage Weil2f2dc052009-10-06 11:31:09 -0700773 }
774
775 /* since this file/dir wasn't known to be
776 * replicated, then we want to look for the
777 * authoritative mds. */
778 mode = USE_AUTH_MDS;
779 if (frag.mds >= 0) {
780 /* choose auth mds */
781 mds = frag.mds;
782 dout("choose_mds %p %llx.%llx "
783 "frag %u mds%d (auth)\n",
784 inode, ceph_vinop(inode), frag.frag, mds);
Sage Weild66bbd42011-01-21 21:16:46 -0800785 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
786 CEPH_MDS_STATE_ACTIVE)
787 return mds;
Sage Weil2f2dc052009-10-06 11:31:09 -0700788 }
789 }
790 }
791
Sage Weilbe655592011-11-30 09:47:09 -0800792 spin_lock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -0700793 cap = NULL;
794 if (mode == USE_AUTH_MDS)
795 cap = ci->i_auth_cap;
796 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
797 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
798 if (!cap) {
Sage Weilbe655592011-11-30 09:47:09 -0800799 spin_unlock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -0700800 goto random;
801 }
802 mds = cap->session->s_mds;
803 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
804 inode, ceph_vinop(inode), mds,
805 cap == ci->i_auth_cap ? "auth " : "", cap);
Sage Weilbe655592011-11-30 09:47:09 -0800806 spin_unlock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -0700807 return mds;
808
809random:
810 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
811 dout("choose_mds chose random mds%d\n", mds);
812 return mds;
813}
814
815
816/*
817 * session messages
818 */
819static struct ceph_msg *create_session_msg(u32 op, u64 seq)
820{
821 struct ceph_msg *msg;
822 struct ceph_mds_session_head *h;
823
Sage Weilb61c2762011-08-09 15:03:46 -0700824 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
825 false);
Sage Weila79832f2010-04-01 16:06:19 -0700826 if (!msg) {
Sage Weil2f2dc052009-10-06 11:31:09 -0700827 pr_err("create_session_msg ENOMEM creating msg\n");
Sage Weila79832f2010-04-01 16:06:19 -0700828 return NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -0700829 }
830 h = msg->front.iov_base;
831 h->op = cpu_to_le32(op);
832 h->seq = cpu_to_le64(seq);
John Spraydbd0c8b2014-09-09 19:26:01 +0100833
834 return msg;
835}
836
837/*
838 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
839 * to include additional client metadata fields.
840 */
841static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
842{
843 struct ceph_msg *msg;
844 struct ceph_mds_session_head *h;
845 int i = -1;
846 int metadata_bytes = 0;
847 int metadata_key_count = 0;
848 struct ceph_options *opt = mdsc->fsc->client->options;
Yan, Zheng3f384952016-04-21 11:09:55 +0800849 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
John Spraydbd0c8b2014-09-09 19:26:01 +0100850 void *p;
851
Yan, Zhenga6a5ce42015-01-16 10:54:43 +0800852 const char* metadata[][2] = {
John Spraydbd0c8b2014-09-09 19:26:01 +0100853 {"hostname", utsname()->nodename},
Yan, Zhenga6a5ce42015-01-16 10:54:43 +0800854 {"kernel_version", utsname()->release},
Yan, Zheng3f384952016-04-21 11:09:55 +0800855 {"entity_id", opt->name ? : ""},
856 {"root", fsopt->server_path ? : "/"},
John Spraydbd0c8b2014-09-09 19:26:01 +0100857 {NULL, NULL}
858 };
859
860 /* Calculate serialized length of metadata */
861 metadata_bytes = 4; /* map length */
862 for (i = 0; metadata[i][0] != NULL; ++i) {
863 metadata_bytes += 8 + strlen(metadata[i][0]) +
864 strlen(metadata[i][1]);
865 metadata_key_count++;
866 }
867
868 /* Allocate the message */
869 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
870 GFP_NOFS, false);
871 if (!msg) {
872 pr_err("create_session_msg ENOMEM creating msg\n");
873 return NULL;
874 }
875 h = msg->front.iov_base;
876 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
877 h->seq = cpu_to_le64(seq);
878
879 /*
880 * Serialize client metadata into waiting buffer space, using
881 * the format that userspace expects for map<string, string>
John Spray7cfa0312014-10-30 17:15:26 +0000882 *
883 * ClientSession messages with metadata are v2
John Spraydbd0c8b2014-09-09 19:26:01 +0100884 */
John Spray7cfa0312014-10-30 17:15:26 +0000885 msg->hdr.version = cpu_to_le16(2);
886 msg->hdr.compat_version = cpu_to_le16(1);
John Spraydbd0c8b2014-09-09 19:26:01 +0100887
888 /* The write pointer, following the session_head structure */
889 p = msg->front.iov_base + sizeof(*h);
890
891 /* Number of entries in the map */
892 ceph_encode_32(&p, metadata_key_count);
893
894 /* Two length-prefixed strings for each entry in the map */
895 for (i = 0; metadata[i][0] != NULL; ++i) {
896 size_t const key_len = strlen(metadata[i][0]);
897 size_t const val_len = strlen(metadata[i][1]);
898
899 ceph_encode_32(&p, key_len);
900 memcpy(p, metadata[i][0], key_len);
901 p += key_len;
902 ceph_encode_32(&p, val_len);
903 memcpy(p, metadata[i][1], val_len);
904 p += val_len;
905 }
906
Sage Weil2f2dc052009-10-06 11:31:09 -0700907 return msg;
908}
909
910/*
911 * send session open request.
912 *
913 * called under mdsc->mutex
914 */
915static int __open_session(struct ceph_mds_client *mdsc,
916 struct ceph_mds_session *session)
917{
918 struct ceph_msg *msg;
919 int mstate;
920 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -0700921
922 /* wait for mds to go active? */
923 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
924 dout("open_session to mds%d (%s)\n", mds,
925 ceph_mds_state_name(mstate));
926 session->s_state = CEPH_MDS_SESSION_OPENING;
927 session->s_renew_requested = jiffies;
928
929 /* send connect message */
John Spraydbd0c8b2014-09-09 19:26:01 +0100930 msg = create_session_open_msg(mdsc, session->s_seq);
Sage Weila79832f2010-04-01 16:06:19 -0700931 if (!msg)
932 return -ENOMEM;
Sage Weil2f2dc052009-10-06 11:31:09 -0700933 ceph_con_send(&session->s_con, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -0700934 return 0;
935}
936
937/*
Sage Weiled0552a2010-06-21 13:38:25 -0700938 * open sessions for any export targets for the given mds
939 *
940 * called under mdsc->mutex
941 */
Yan, Zheng5d72d132013-11-24 14:33:01 +0800942static struct ceph_mds_session *
943__open_export_target_session(struct ceph_mds_client *mdsc, int target)
944{
945 struct ceph_mds_session *session;
946
947 session = __ceph_lookup_mds_session(mdsc, target);
948 if (!session) {
949 session = register_session(mdsc, target);
950 if (IS_ERR(session))
951 return session;
952 }
953 if (session->s_state == CEPH_MDS_SESSION_NEW ||
954 session->s_state == CEPH_MDS_SESSION_CLOSING)
955 __open_session(mdsc, session);
956
957 return session;
958}
959
960struct ceph_mds_session *
961ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
962{
963 struct ceph_mds_session *session;
964
965 dout("open_export_target_session to mds%d\n", target);
966
967 mutex_lock(&mdsc->mutex);
968 session = __open_export_target_session(mdsc, target);
969 mutex_unlock(&mdsc->mutex);
970
971 return session;
972}
973
Sage Weiled0552a2010-06-21 13:38:25 -0700974static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
975 struct ceph_mds_session *session)
976{
977 struct ceph_mds_info *mi;
978 struct ceph_mds_session *ts;
979 int i, mds = session->s_mds;
Sage Weiled0552a2010-06-21 13:38:25 -0700980
981 if (mds >= mdsc->mdsmap->m_max_mds)
982 return;
Yan, Zheng5d72d132013-11-24 14:33:01 +0800983
Sage Weiled0552a2010-06-21 13:38:25 -0700984 mi = &mdsc->mdsmap->m_info[mds];
985 dout("open_export_target_sessions for mds%d (%d targets)\n",
986 session->s_mds, mi->num_export_targets);
987
988 for (i = 0; i < mi->num_export_targets; i++) {
Yan, Zheng5d72d132013-11-24 14:33:01 +0800989 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
990 if (!IS_ERR(ts))
991 ceph_put_mds_session(ts);
Sage Weiled0552a2010-06-21 13:38:25 -0700992 }
993}
994
Sage Weil154f42c2010-06-21 13:45:04 -0700995void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
996 struct ceph_mds_session *session)
997{
998 mutex_lock(&mdsc->mutex);
999 __open_export_target_sessions(mdsc, session);
1000 mutex_unlock(&mdsc->mutex);
1001}
1002
Sage Weiled0552a2010-06-21 13:38:25 -07001003/*
Sage Weil2f2dc052009-10-06 11:31:09 -07001004 * session caps
1005 */
1006
Yan, Zheng745a8e32015-05-14 17:22:42 +08001007/* caller holds s_cap_lock, we drop it */
1008static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1009 struct ceph_mds_session *session)
1010 __releases(session->s_cap_lock)
Sage Weil2f2dc052009-10-06 11:31:09 -07001011{
Yan, Zheng745a8e32015-05-14 17:22:42 +08001012 LIST_HEAD(tmp_list);
1013 list_splice_init(&session->s_cap_releases, &tmp_list);
1014 session->s_num_cap_releases = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07001015 spin_unlock(&session->s_cap_lock);
Yan, Zheng745a8e32015-05-14 17:22:42 +08001016
1017 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1018 while (!list_empty(&tmp_list)) {
1019 struct ceph_cap *cap;
1020 /* zero out the in-progress message */
1021 cap = list_first_entry(&tmp_list,
1022 struct ceph_cap, session_caps);
1023 list_del(&cap->session_caps);
1024 ceph_put_cap(mdsc, cap);
1025 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001026}
1027
Yan, Zheng1c841a92015-03-24 20:15:36 +08001028static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1029 struct ceph_mds_session *session)
1030{
1031 struct ceph_mds_request *req;
1032 struct rb_node *p;
1033
1034 dout("cleanup_session_requests mds%d\n", session->s_mds);
1035 mutex_lock(&mdsc->mutex);
1036 while (!list_empty(&session->s_unsafe)) {
1037 req = list_first_entry(&session->s_unsafe,
1038 struct ceph_mds_request, r_unsafe_item);
1039 list_del_init(&req->r_unsafe_item);
Yan, Zheng3e0708b2015-05-22 16:38:02 +08001040 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1041 req->r_tid);
Yan, Zheng1c841a92015-03-24 20:15:36 +08001042 __unregister_request(mdsc, req);
1043 }
1044 /* zero r_attempts, so kick_requests() will re-send requests */
1045 p = rb_first(&mdsc->request_tree);
1046 while (p) {
1047 req = rb_entry(p, struct ceph_mds_request, r_node);
1048 p = rb_next(p);
1049 if (req->r_session &&
1050 req->r_session->s_mds == session->s_mds)
1051 req->r_attempts = 0;
1052 }
1053 mutex_unlock(&mdsc->mutex);
1054}
1055
Sage Weil2f2dc052009-10-06 11:31:09 -07001056/*
Sage Weilf818a732010-05-11 20:56:31 -07001057 * Helper to safely iterate over all caps associated with a session, with
1058 * special care taken to handle a racing __ceph_remove_cap().
Sage Weil2f2dc052009-10-06 11:31:09 -07001059 *
Sage Weilf818a732010-05-11 20:56:31 -07001060 * Caller must hold session s_mutex.
Sage Weil2f2dc052009-10-06 11:31:09 -07001061 */
1062static int iterate_session_caps(struct ceph_mds_session *session,
1063 int (*cb)(struct inode *, struct ceph_cap *,
1064 void *), void *arg)
1065{
Sage Weil7c1332b2010-02-16 11:39:45 -08001066 struct list_head *p;
1067 struct ceph_cap *cap;
1068 struct inode *inode, *last_inode = NULL;
1069 struct ceph_cap *old_cap = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -07001070 int ret;
1071
1072 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1073 spin_lock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -08001074 p = session->s_caps.next;
1075 while (p != &session->s_caps) {
1076 cap = list_entry(p, struct ceph_cap, session_caps);
Sage Weil2f2dc052009-10-06 11:31:09 -07001077 inode = igrab(&cap->ci->vfs_inode);
Sage Weil7c1332b2010-02-16 11:39:45 -08001078 if (!inode) {
1079 p = p->next;
Sage Weil2f2dc052009-10-06 11:31:09 -07001080 continue;
Sage Weil7c1332b2010-02-16 11:39:45 -08001081 }
1082 session->s_cap_iterator = cap;
Sage Weil2f2dc052009-10-06 11:31:09 -07001083 spin_unlock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -08001084
1085 if (last_inode) {
1086 iput(last_inode);
1087 last_inode = NULL;
1088 }
1089 if (old_cap) {
Yehuda Sadeh37151662010-06-17 16:16:12 -07001090 ceph_put_cap(session->s_mdsc, old_cap);
Sage Weil7c1332b2010-02-16 11:39:45 -08001091 old_cap = NULL;
1092 }
1093
Sage Weil2f2dc052009-10-06 11:31:09 -07001094 ret = cb(inode, cap, arg);
Sage Weil7c1332b2010-02-16 11:39:45 -08001095 last_inode = inode;
1096
Sage Weil2f2dc052009-10-06 11:31:09 -07001097 spin_lock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -08001098 p = p->next;
1099 if (cap->ci == NULL) {
1100 dout("iterate_session_caps finishing cap %p removal\n",
1101 cap);
1102 BUG_ON(cap->session != session);
Yan, Zheng745a8e32015-05-14 17:22:42 +08001103 cap->session = NULL;
Sage Weil7c1332b2010-02-16 11:39:45 -08001104 list_del_init(&cap->session_caps);
1105 session->s_nr_caps--;
Yan, Zheng745a8e32015-05-14 17:22:42 +08001106 if (cap->queue_release) {
1107 list_add_tail(&cap->session_caps,
1108 &session->s_cap_releases);
1109 session->s_num_cap_releases++;
1110 } else {
1111 old_cap = cap; /* put_cap it w/o locks held */
1112 }
Sage Weil7c1332b2010-02-16 11:39:45 -08001113 }
Sage Weil5dacf092009-12-21 20:40:34 -08001114 if (ret < 0)
1115 goto out;
Sage Weil2f2dc052009-10-06 11:31:09 -07001116 }
Sage Weil5dacf092009-12-21 20:40:34 -08001117 ret = 0;
1118out:
Sage Weil7c1332b2010-02-16 11:39:45 -08001119 session->s_cap_iterator = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -07001120 spin_unlock(&session->s_cap_lock);
Sage Weil7c1332b2010-02-16 11:39:45 -08001121
SF Markus Elfringe96a6502014-11-02 15:20:59 +01001122 iput(last_inode);
Sage Weil7c1332b2010-02-16 11:39:45 -08001123 if (old_cap)
Yehuda Sadeh37151662010-06-17 16:16:12 -07001124 ceph_put_cap(session->s_mdsc, old_cap);
Sage Weil7c1332b2010-02-16 11:39:45 -08001125
Sage Weil5dacf092009-12-21 20:40:34 -08001126 return ret;
Sage Weil2f2dc052009-10-06 11:31:09 -07001127}
1128
1129static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
Sage Weil6c99f252010-05-10 16:12:25 -07001130 void *arg)
Sage Weil2f2dc052009-10-06 11:31:09 -07001131{
Yan, Zheng6c93df52016-04-15 13:56:12 +08001132 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
Sage Weil2f2dc052009-10-06 11:31:09 -07001133 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng553adfd2015-06-09 15:48:57 +08001134 LIST_HEAD(to_remove);
Yan, Zheng6c93df52016-04-15 13:56:12 +08001135 bool drop = false;
1136 bool invalidate = false;
Sage Weil6c99f252010-05-10 16:12:25 -07001137
Sage Weil2f2dc052009-10-06 11:31:09 -07001138 dout("removing cap %p, ci is %p, inode is %p\n",
1139 cap, ci, &ci->vfs_inode);
Sage Weilbe655592011-11-30 09:47:09 -08001140 spin_lock(&ci->i_ceph_lock);
Yan, Zhenga096b092013-09-22 10:15:58 +08001141 __ceph_remove_cap(cap, false);
Yan, Zheng571ade32015-03-24 11:36:08 +08001142 if (!ci->i_auth_cap) {
Yan, Zheng553adfd2015-06-09 15:48:57 +08001143 struct ceph_cap_flush *cf;
Yan, Zheng6c93df52016-04-15 13:56:12 +08001144 struct ceph_mds_client *mdsc = fsc->mdsc;
Sage Weil6c99f252010-05-10 16:12:25 -07001145
Yan, Zheng77310322016-04-08 15:27:16 +08001146 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1147
Yan, Zheng6c93df52016-04-15 13:56:12 +08001148 if (ci->i_wrbuffer_ref > 0 &&
1149 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1150 invalidate = true;
1151
Yan, Zhenge4500b52016-07-06 11:12:56 +08001152 while (!list_empty(&ci->i_cap_flush_list)) {
1153 cf = list_first_entry(&ci->i_cap_flush_list,
1154 struct ceph_cap_flush, i_list);
Wei Yongjun8cdcc072016-08-13 09:10:28 +00001155 list_move(&cf->i_list, &to_remove);
Yan, Zheng553adfd2015-06-09 15:48:57 +08001156 }
1157
Sage Weil6c99f252010-05-10 16:12:25 -07001158 spin_lock(&mdsc->cap_dirty_lock);
Yan, Zheng8310b082015-06-09 17:20:12 +08001159
Yan, Zhenge4500b52016-07-06 11:12:56 +08001160 list_for_each_entry(cf, &to_remove, i_list)
1161 list_del(&cf->g_list);
Yan, Zheng8310b082015-06-09 17:20:12 +08001162
Sage Weil6c99f252010-05-10 16:12:25 -07001163 if (!list_empty(&ci->i_dirty_item)) {
Yan, Zheng3e0708b2015-05-22 16:38:02 +08001164 pr_warn_ratelimited(
1165 " dropping dirty %s state for %p %lld\n",
Sage Weil6c99f252010-05-10 16:12:25 -07001166 ceph_cap_string(ci->i_dirty_caps),
1167 inode, ceph_ino(inode));
1168 ci->i_dirty_caps = 0;
1169 list_del_init(&ci->i_dirty_item);
Yan, Zheng6c93df52016-04-15 13:56:12 +08001170 drop = true;
Sage Weil6c99f252010-05-10 16:12:25 -07001171 }
1172 if (!list_empty(&ci->i_flushing_item)) {
Yan, Zheng3e0708b2015-05-22 16:38:02 +08001173 pr_warn_ratelimited(
1174 " dropping dirty+flushing %s state for %p %lld\n",
Sage Weil6c99f252010-05-10 16:12:25 -07001175 ceph_cap_string(ci->i_flushing_caps),
1176 inode, ceph_ino(inode));
1177 ci->i_flushing_caps = 0;
1178 list_del_init(&ci->i_flushing_item);
1179 mdsc->num_cap_flushing--;
Yan, Zheng6c93df52016-04-15 13:56:12 +08001180 drop = true;
Sage Weil6c99f252010-05-10 16:12:25 -07001181 }
Sage Weil6c99f252010-05-10 16:12:25 -07001182 spin_unlock(&mdsc->cap_dirty_lock);
Yan, Zheng553adfd2015-06-09 15:48:57 +08001183
Yan, Zhengf66fd9f2015-06-10 17:26:13 +08001184 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
Yan, Zhenge4500b52016-07-06 11:12:56 +08001185 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
Yan, Zhengf66fd9f2015-06-10 17:26:13 +08001186 ci->i_prealloc_cap_flush = NULL;
1187 }
Sage Weil6c99f252010-05-10 16:12:25 -07001188 }
Sage Weilbe655592011-11-30 09:47:09 -08001189 spin_unlock(&ci->i_ceph_lock);
Yan, Zheng553adfd2015-06-09 15:48:57 +08001190 while (!list_empty(&to_remove)) {
1191 struct ceph_cap_flush *cf;
1192 cf = list_first_entry(&to_remove,
Yan, Zhenge4500b52016-07-06 11:12:56 +08001193 struct ceph_cap_flush, i_list);
1194 list_del(&cf->i_list);
Yan, Zhengf66fd9f2015-06-10 17:26:13 +08001195 ceph_free_cap_flush(cf);
Yan, Zheng553adfd2015-06-09 15:48:57 +08001196 }
Yan, Zheng77310322016-04-08 15:27:16 +08001197
1198 wake_up_all(&ci->i_cap_wq);
Yan, Zheng6c93df52016-04-15 13:56:12 +08001199 if (invalidate)
1200 ceph_queue_invalidate(inode);
Yan, Zheng77310322016-04-08 15:27:16 +08001201 if (drop)
Sage Weil6c99f252010-05-10 16:12:25 -07001202 iput(inode);
Sage Weil2f2dc052009-10-06 11:31:09 -07001203 return 0;
1204}
1205
1206/*
1207 * caller must hold session s_mutex
1208 */
1209static void remove_session_caps(struct ceph_mds_session *session)
1210{
Yan, Zheng6c93df52016-04-15 13:56:12 +08001211 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1212 struct super_block *sb = fsc->sb;
Sage Weil2f2dc052009-10-06 11:31:09 -07001213 dout("remove_session_caps on %p\n", session);
Yan, Zheng6c93df52016-04-15 13:56:12 +08001214 iterate_session_caps(session, remove_session_caps_cb, fsc);
Yan, Zheng6f60f882013-07-24 12:22:11 +08001215
Yan, Zhengc8799fc2016-07-07 15:22:38 +08001216 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1217
Yan, Zheng6f60f882013-07-24 12:22:11 +08001218 spin_lock(&session->s_cap_lock);
1219 if (session->s_nr_caps > 0) {
Yan, Zheng6f60f882013-07-24 12:22:11 +08001220 struct inode *inode;
1221 struct ceph_cap *cap, *prev = NULL;
1222 struct ceph_vino vino;
1223 /*
1224 * iterate_session_caps() skips inodes that are being
1225 * deleted, we need to wait until deletions are complete.
1226 * __wait_on_freeing_inode() is designed for the job,
1227 * but it is not exported, so use lookup inode function
1228 * to access it.
1229 */
1230 while (!list_empty(&session->s_caps)) {
1231 cap = list_entry(session->s_caps.next,
1232 struct ceph_cap, session_caps);
1233 if (cap == prev)
1234 break;
1235 prev = cap;
1236 vino = cap->ci->i_vino;
1237 spin_unlock(&session->s_cap_lock);
1238
Yan, Zhenged284c42013-09-02 15:19:53 +08001239 inode = ceph_find_inode(sb, vino);
Yan, Zheng6f60f882013-07-24 12:22:11 +08001240 iput(inode);
1241
1242 spin_lock(&session->s_cap_lock);
1243 }
1244 }
Yan, Zheng745a8e32015-05-14 17:22:42 +08001245
1246 // drop cap expires and unlock s_cap_lock
1247 cleanup_cap_releases(session->s_mdsc, session);
Yan, Zheng6f60f882013-07-24 12:22:11 +08001248
Sage Weil2f2dc052009-10-06 11:31:09 -07001249 BUG_ON(session->s_nr_caps > 0);
Sage Weil6c99f252010-05-10 16:12:25 -07001250 BUG_ON(!list_empty(&session->s_cap_flushing));
Sage Weil2f2dc052009-10-06 11:31:09 -07001251}
1252
1253/*
1254 * wake up any threads waiting on this session's caps. if the cap is
1255 * old (didn't get renewed on the client reconnect), remove it now.
1256 *
1257 * caller must hold s_mutex.
1258 */
1259static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1260 void *arg)
1261{
Sage Weil0dc25702009-11-20 13:43:45 -08001262 struct ceph_inode_info *ci = ceph_inode(inode);
1263
Sage Weil0dc25702009-11-20 13:43:45 -08001264 if (arg) {
Sage Weilbe655592011-11-30 09:47:09 -08001265 spin_lock(&ci->i_ceph_lock);
Sage Weil0dc25702009-11-20 13:43:45 -08001266 ci->i_wanted_max_size = 0;
1267 ci->i_requested_max_size = 0;
Sage Weilbe655592011-11-30 09:47:09 -08001268 spin_unlock(&ci->i_ceph_lock);
Sage Weil0dc25702009-11-20 13:43:45 -08001269 }
Yan, Zhenge5360302016-05-19 19:15:19 +08001270 wake_up_all(&ci->i_cap_wq);
Sage Weil2f2dc052009-10-06 11:31:09 -07001271 return 0;
1272}
1273
Sage Weil0dc25702009-11-20 13:43:45 -08001274static void wake_up_session_caps(struct ceph_mds_session *session,
1275 int reconnect)
Sage Weil2f2dc052009-10-06 11:31:09 -07001276{
1277 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
Sage Weil0dc25702009-11-20 13:43:45 -08001278 iterate_session_caps(session, wake_up_session_cb,
1279 (void *)(unsigned long)reconnect);
Sage Weil2f2dc052009-10-06 11:31:09 -07001280}
1281
1282/*
1283 * Send periodic message to MDS renewing all currently held caps. The
1284 * ack will reset the expiration for all caps from this session.
1285 *
1286 * caller holds s_mutex
1287 */
1288static int send_renew_caps(struct ceph_mds_client *mdsc,
1289 struct ceph_mds_session *session)
1290{
1291 struct ceph_msg *msg;
1292 int state;
1293
1294 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1295 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1296 pr_info("mds%d caps stale\n", session->s_mds);
Sage Weile4cb4cb2010-03-18 13:43:09 -07001297 session->s_renew_requested = jiffies;
Sage Weil2f2dc052009-10-06 11:31:09 -07001298
1299 /* do not try to renew caps until a recovering mds has reconnected
1300 * with its clients. */
1301 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1302 if (state < CEPH_MDS_STATE_RECONNECT) {
1303 dout("send_renew_caps ignoring mds%d (%s)\n",
1304 session->s_mds, ceph_mds_state_name(state));
1305 return 0;
1306 }
1307
1308 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1309 ceph_mds_state_name(state));
Sage Weil2f2dc052009-10-06 11:31:09 -07001310 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1311 ++session->s_renew_seq);
Sage Weila79832f2010-04-01 16:06:19 -07001312 if (!msg)
1313 return -ENOMEM;
Sage Weil2f2dc052009-10-06 11:31:09 -07001314 ceph_con_send(&session->s_con, msg);
1315 return 0;
1316}
1317
Yan, Zheng186e4f72013-11-22 14:48:37 +08001318static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1319 struct ceph_mds_session *session, u64 seq)
1320{
1321 struct ceph_msg *msg;
1322
1323 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
John Spraya687eca2014-09-19 13:51:08 +01001324 session->s_mds, ceph_session_state_name(session->s_state), seq);
Yan, Zheng186e4f72013-11-22 14:48:37 +08001325 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1326 if (!msg)
1327 return -ENOMEM;
1328 ceph_con_send(&session->s_con, msg);
1329 return 0;
1330}
1331
1332
Sage Weil2f2dc052009-10-06 11:31:09 -07001333/*
1334 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
Sage Weil0dc25702009-11-20 13:43:45 -08001335 *
1336 * Called under session->s_mutex
Sage Weil2f2dc052009-10-06 11:31:09 -07001337 */
1338static void renewed_caps(struct ceph_mds_client *mdsc,
1339 struct ceph_mds_session *session, int is_renew)
1340{
1341 int was_stale;
1342 int wake = 0;
1343
1344 spin_lock(&session->s_cap_lock);
Alex Elder1ce208a2012-01-12 17:48:11 -08001345 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
Sage Weil2f2dc052009-10-06 11:31:09 -07001346
1347 session->s_cap_ttl = session->s_renew_requested +
1348 mdsc->mdsmap->m_session_timeout*HZ;
1349
1350 if (was_stale) {
1351 if (time_before(jiffies, session->s_cap_ttl)) {
1352 pr_info("mds%d caps renewed\n", session->s_mds);
1353 wake = 1;
1354 } else {
1355 pr_info("mds%d caps still stale\n", session->s_mds);
1356 }
1357 }
1358 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1359 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1360 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1361 spin_unlock(&session->s_cap_lock);
1362
1363 if (wake)
Sage Weil0dc25702009-11-20 13:43:45 -08001364 wake_up_session_caps(session, 0);
Sage Weil2f2dc052009-10-06 11:31:09 -07001365}
1366
1367/*
1368 * send a session close request
1369 */
1370static int request_close_session(struct ceph_mds_client *mdsc,
1371 struct ceph_mds_session *session)
1372{
1373 struct ceph_msg *msg;
Sage Weil2f2dc052009-10-06 11:31:09 -07001374
1375 dout("request_close_session mds%d state %s seq %lld\n",
John Spraya687eca2014-09-19 13:51:08 +01001376 session->s_mds, ceph_session_state_name(session->s_state),
Sage Weil2f2dc052009-10-06 11:31:09 -07001377 session->s_seq);
1378 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
Sage Weila79832f2010-04-01 16:06:19 -07001379 if (!msg)
1380 return -ENOMEM;
1381 ceph_con_send(&session->s_con, msg);
Yan, Zhengfcff4152016-09-14 16:39:51 +08001382 return 1;
Sage Weil2f2dc052009-10-06 11:31:09 -07001383}
1384
1385/*
1386 * Called with s_mutex held.
1387 */
1388static int __close_session(struct ceph_mds_client *mdsc,
1389 struct ceph_mds_session *session)
1390{
1391 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1392 return 0;
1393 session->s_state = CEPH_MDS_SESSION_CLOSING;
1394 return request_close_session(mdsc, session);
1395}
1396
1397/*
1398 * Trim old(er) caps.
1399 *
1400 * Because we can't cache an inode without one or more caps, we do
1401 * this indirectly: if a cap is unused, we prune its aliases, at which
1402 * point the inode will hopefully get dropped to.
1403 *
1404 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1405 * memory pressure from the MDS, though, so it needn't be perfect.
1406 */
1407static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1408{
1409 struct ceph_mds_session *session = arg;
1410 struct ceph_inode_info *ci = ceph_inode(inode);
Yan, Zheng979abfd2013-11-22 13:56:24 +08001411 int used, wanted, oissued, mine;
Sage Weil2f2dc052009-10-06 11:31:09 -07001412
1413 if (session->s_trim_caps <= 0)
1414 return -1;
1415
Sage Weilbe655592011-11-30 09:47:09 -08001416 spin_lock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001417 mine = cap->issued | cap->implemented;
1418 used = __ceph_caps_used(ci);
Yan, Zheng979abfd2013-11-22 13:56:24 +08001419 wanted = __ceph_caps_file_wanted(ci);
Sage Weil2f2dc052009-10-06 11:31:09 -07001420 oissued = __ceph_caps_issued_other(ci, cap);
1421
Yan, Zheng979abfd2013-11-22 13:56:24 +08001422 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07001423 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
Yan, Zheng979abfd2013-11-22 13:56:24 +08001424 ceph_cap_string(used), ceph_cap_string(wanted));
1425 if (cap == ci->i_auth_cap) {
Yan, Zheng622f3e22015-05-07 10:59:47 +08001426 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1427 !list_empty(&ci->i_cap_snaps))
Yan, Zheng979abfd2013-11-22 13:56:24 +08001428 goto out;
1429 if ((used | wanted) & CEPH_CAP_ANY_WR)
1430 goto out;
1431 }
Yan, Zheng5e804ac2015-10-26 16:08:43 +08001432 /* The inode has cached pages, but it's no longer used.
1433 * we can safely drop it */
1434 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1435 !(oissued & CEPH_CAP_FILE_CACHE)) {
1436 used = 0;
1437 oissued = 0;
1438 }
Yan, Zheng979abfd2013-11-22 13:56:24 +08001439 if ((used | wanted) & ~oissued & mine)
Sage Weil2f2dc052009-10-06 11:31:09 -07001440 goto out; /* we need these caps */
1441
1442 session->s_trim_caps--;
1443 if (oissued) {
1444 /* we aren't the only cap.. just remove us */
Yan, Zhenga096b092013-09-22 10:15:58 +08001445 __ceph_remove_cap(cap, true);
Sage Weil2f2dc052009-10-06 11:31:09 -07001446 } else {
Yan, Zheng5e804ac2015-10-26 16:08:43 +08001447 /* try dropping referring dentries */
Sage Weilbe655592011-11-30 09:47:09 -08001448 spin_unlock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001449 d_prune_aliases(inode);
1450 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1451 inode, cap, atomic_read(&inode->i_count));
1452 return 0;
1453 }
1454
1455out:
Sage Weilbe655592011-11-30 09:47:09 -08001456 spin_unlock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001457 return 0;
1458}
1459
1460/*
1461 * Trim session cap count down to some max number.
1462 */
1463static int trim_caps(struct ceph_mds_client *mdsc,
1464 struct ceph_mds_session *session,
1465 int max_caps)
1466{
1467 int trim_caps = session->s_nr_caps - max_caps;
1468
1469 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1470 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1471 if (trim_caps > 0) {
1472 session->s_trim_caps = trim_caps;
1473 iterate_session_caps(session, trim_caps_cb, session);
1474 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1475 session->s_mds, session->s_nr_caps, max_caps,
1476 trim_caps - session->s_trim_caps);
Sage Weil5dacf092009-12-21 20:40:34 -08001477 session->s_trim_caps = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07001478 }
Yan, Zhenga56371d2014-04-01 20:34:56 +08001479
Yan, Zhenga56371d2014-04-01 20:34:56 +08001480 ceph_send_cap_releases(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07001481 return 0;
1482}
1483
Yan, Zheng8310b082015-06-09 17:20:12 +08001484static int check_caps_flush(struct ceph_mds_client *mdsc,
1485 u64 want_flush_tid)
1486{
Yan, Zheng8310b082015-06-09 17:20:12 +08001487 int ret = 1;
1488
1489 spin_lock(&mdsc->cap_dirty_lock);
Yan, Zhenge4500b52016-07-06 11:12:56 +08001490 if (!list_empty(&mdsc->cap_flush_list)) {
1491 struct ceph_cap_flush *cf =
1492 list_first_entry(&mdsc->cap_flush_list,
1493 struct ceph_cap_flush, g_list);
1494 if (cf->tid <= want_flush_tid) {
1495 dout("check_caps_flush still flushing tid "
1496 "%llu <= %llu\n", cf->tid, want_flush_tid);
1497 ret = 0;
1498 }
Yan, Zheng8310b082015-06-09 17:20:12 +08001499 }
1500 spin_unlock(&mdsc->cap_dirty_lock);
1501 return ret;
Yan, Zhengd3383a82015-01-08 21:30:12 +08001502}
1503
Sage Weil2f2dc052009-10-06 11:31:09 -07001504/*
1505 * flush all dirty inode data to disk.
1506 *
Yan, Zheng8310b082015-06-09 17:20:12 +08001507 * returns true if we've flushed through want_flush_tid
Sage Weil2f2dc052009-10-06 11:31:09 -07001508 */
Yan, Zhengaffbc192015-05-05 21:22:13 +08001509static void wait_caps_flush(struct ceph_mds_client *mdsc,
Yan, Zheng0e294382016-07-04 18:06:41 +08001510 u64 want_flush_tid)
Sage Weil2f2dc052009-10-06 11:31:09 -07001511{
Yan, Zheng0e294382016-07-04 18:06:41 +08001512 dout("check_caps_flush want %llu\n", want_flush_tid);
Yan, Zheng8310b082015-06-09 17:20:12 +08001513
1514 wait_event(mdsc->cap_flushing_wq,
1515 check_caps_flush(mdsc, want_flush_tid));
1516
1517 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07001518}
1519
1520/*
1521 * called under s_mutex
1522 */
Sage Weil3d7ded42010-06-09 16:47:10 -07001523void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1524 struct ceph_mds_session *session)
Sage Weil2f2dc052009-10-06 11:31:09 -07001525{
Yan, Zheng745a8e32015-05-14 17:22:42 +08001526 struct ceph_msg *msg = NULL;
1527 struct ceph_mds_cap_release *head;
1528 struct ceph_mds_cap_item *item;
1529 struct ceph_cap *cap;
1530 LIST_HEAD(tmp_list);
1531 int num_cap_releases;
Sage Weil2f2dc052009-10-06 11:31:09 -07001532
Sage Weil0f8605f2010-05-05 15:51:35 -07001533 spin_lock(&session->s_cap_lock);
Yan, Zheng745a8e32015-05-14 17:22:42 +08001534again:
1535 list_splice_init(&session->s_cap_releases, &tmp_list);
1536 num_cap_releases = session->s_num_cap_releases;
1537 session->s_num_cap_releases = 0;
1538 spin_unlock(&session->s_cap_lock);
1539
1540 while (!list_empty(&tmp_list)) {
1541 if (!msg) {
1542 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001543 PAGE_SIZE, GFP_NOFS, false);
Yan, Zheng745a8e32015-05-14 17:22:42 +08001544 if (!msg)
1545 goto out_err;
1546 head = msg->front.iov_base;
1547 head->num = cpu_to_le32(0);
1548 msg->front.iov_len = sizeof(*head);
1549 }
1550 cap = list_first_entry(&tmp_list, struct ceph_cap,
1551 session_caps);
1552 list_del(&cap->session_caps);
1553 num_cap_releases--;
1554
1555 head = msg->front.iov_base;
1556 le32_add_cpu(&head->num, 1);
1557 item = msg->front.iov_base + msg->front.iov_len;
1558 item->ino = cpu_to_le64(cap->cap_ino);
1559 item->cap_id = cpu_to_le64(cap->cap_id);
1560 item->migrate_seq = cpu_to_le32(cap->mseq);
1561 item->seq = cpu_to_le32(cap->issue_seq);
1562 msg->front.iov_len += sizeof(*item);
1563
1564 ceph_put_cap(mdsc, cap);
1565
1566 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1567 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1568 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1569 ceph_con_send(&session->s_con, msg);
1570 msg = NULL;
1571 }
1572 }
1573
1574 BUG_ON(num_cap_releases != 0);
1575
1576 spin_lock(&session->s_cap_lock);
1577 if (!list_empty(&session->s_cap_releases))
1578 goto again;
1579 spin_unlock(&session->s_cap_lock);
1580
1581 if (msg) {
Sage Weil2f2dc052009-10-06 11:31:09 -07001582 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1583 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1584 ceph_con_send(&session->s_con, msg);
1585 }
Yan, Zheng745a8e32015-05-14 17:22:42 +08001586 return;
1587out_err:
1588 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1589 session->s_mds);
1590 spin_lock(&session->s_cap_lock);
1591 list_splice(&tmp_list, &session->s_cap_releases);
1592 session->s_num_cap_releases += num_cap_releases;
Sage Weil2f2dc052009-10-06 11:31:09 -07001593 spin_unlock(&session->s_cap_lock);
1594}
1595
1596/*
1597 * requests
1598 */
1599
Yan, Zheng54008392014-03-29 13:41:15 +08001600int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1601 struct inode *dir)
1602{
1603 struct ceph_inode_info *ci = ceph_inode(dir);
1604 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1605 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
Yan, Zheng2a5beea2016-04-28 09:37:39 +08001606 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
Yan, Zheng54008392014-03-29 13:41:15 +08001607 int order, num_entries;
1608
1609 spin_lock(&ci->i_ceph_lock);
1610 num_entries = ci->i_files + ci->i_subdirs;
1611 spin_unlock(&ci->i_ceph_lock);
1612 num_entries = max(num_entries, 1);
1613 num_entries = min(num_entries, opt->max_readdir);
1614
1615 order = get_order(size * num_entries);
1616 while (order >= 0) {
Yan, Zheng2a5beea2016-04-28 09:37:39 +08001617 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1618 __GFP_NOWARN,
1619 order);
1620 if (rinfo->dir_entries)
Yan, Zheng54008392014-03-29 13:41:15 +08001621 break;
1622 order--;
1623 }
Yan, Zheng2a5beea2016-04-28 09:37:39 +08001624 if (!rinfo->dir_entries)
Yan, Zheng54008392014-03-29 13:41:15 +08001625 return -ENOMEM;
1626
1627 num_entries = (PAGE_SIZE << order) / size;
1628 num_entries = min(num_entries, opt->max_readdir);
1629
1630 rinfo->dir_buf_size = PAGE_SIZE << order;
1631 req->r_num_caps = num_entries + 1;
1632 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1633 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1634 return 0;
1635}
1636
Sage Weil2f2dc052009-10-06 11:31:09 -07001637/*
1638 * Create an mds request.
1639 */
1640struct ceph_mds_request *
1641ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1642{
1643 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1644
1645 if (!req)
1646 return ERR_PTR(-ENOMEM);
1647
Sage Weilb4556392010-05-13 12:01:13 -07001648 mutex_init(&req->r_fill_mutex);
Yehuda Sadeh37151662010-06-17 16:16:12 -07001649 req->r_mdsc = mdsc;
Sage Weil2f2dc052009-10-06 11:31:09 -07001650 req->r_started = jiffies;
1651 req->r_resend_mds = -1;
1652 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
Yan, Zheng68cd5b42015-10-27 18:36:06 +08001653 INIT_LIST_HEAD(&req->r_unsafe_target_item);
Sage Weil2f2dc052009-10-06 11:31:09 -07001654 req->r_fmode = -1;
Sage Weil153c8e62009-12-07 12:31:09 -08001655 kref_init(&req->r_kref);
Ilya Dryomovfcd00b62016-04-28 16:07:22 +02001656 RB_CLEAR_NODE(&req->r_node);
Sage Weil2f2dc052009-10-06 11:31:09 -07001657 INIT_LIST_HEAD(&req->r_wait);
1658 init_completion(&req->r_completion);
1659 init_completion(&req->r_safe_completion);
1660 INIT_LIST_HEAD(&req->r_unsafe_item);
1661
Deepa Dinamani8bbd4712016-02-02 22:07:48 -08001662 req->r_stamp = current_fs_time(mdsc->fsc->sb);
Sage Weilb8e69062014-05-21 17:41:08 -07001663
Sage Weil2f2dc052009-10-06 11:31:09 -07001664 req->r_op = op;
1665 req->r_direct_mode = mode;
1666 return req;
1667}
1668
1669/*
Sage Weil44ca18f2010-02-15 12:08:46 -08001670 * return oldest (lowest) request, tid in request tree, 0 if none.
Sage Weil2f2dc052009-10-06 11:31:09 -07001671 *
1672 * called under mdsc->mutex.
1673 */
Sage Weil44ca18f2010-02-15 12:08:46 -08001674static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1675{
1676 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1677 return NULL;
1678 return rb_entry(rb_first(&mdsc->request_tree),
1679 struct ceph_mds_request, r_node);
1680}
1681
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +08001682static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
Sage Weil2f2dc052009-10-06 11:31:09 -07001683{
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +08001684 return mdsc->oldest_tid;
Sage Weil2f2dc052009-10-06 11:31:09 -07001685}
1686
1687/*
1688 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1689 * on build_path_from_dentry in fs/cifs/dir.c.
1690 *
1691 * If @stop_on_nosnap, generate path relative to the first non-snapped
1692 * inode.
1693 *
1694 * Encode hidden .snap dirs as a double /, i.e.
1695 * foo/.snap/bar -> foo//bar
1696 */
1697char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1698 int stop_on_nosnap)
1699{
1700 struct dentry *temp;
1701 char *path;
1702 int len, pos;
Al Viro1b71fe22011-07-16 23:43:58 -04001703 unsigned seq;
Sage Weil2f2dc052009-10-06 11:31:09 -07001704
1705 if (dentry == NULL)
1706 return ERR_PTR(-EINVAL);
1707
1708retry:
1709 len = 0;
Al Viro1b71fe22011-07-16 23:43:58 -04001710 seq = read_seqbegin(&rename_lock);
1711 rcu_read_lock();
Sage Weil2f2dc052009-10-06 11:31:09 -07001712 for (temp = dentry; !IS_ROOT(temp);) {
David Howells2b0143b2015-03-17 22:25:59 +00001713 struct inode *inode = d_inode(temp);
Sage Weil2f2dc052009-10-06 11:31:09 -07001714 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1715 len++; /* slash only */
1716 else if (stop_on_nosnap && inode &&
1717 ceph_snap(inode) == CEPH_NOSNAP)
1718 break;
1719 else
1720 len += 1 + temp->d_name.len;
1721 temp = temp->d_parent;
Sage Weil2f2dc052009-10-06 11:31:09 -07001722 }
Al Viro1b71fe22011-07-16 23:43:58 -04001723 rcu_read_unlock();
Sage Weil2f2dc052009-10-06 11:31:09 -07001724 if (len)
1725 len--; /* no leading '/' */
1726
1727 path = kmalloc(len+1, GFP_NOFS);
1728 if (path == NULL)
1729 return ERR_PTR(-ENOMEM);
1730 pos = len;
1731 path[pos] = 0; /* trailing null */
Al Viro1b71fe22011-07-16 23:43:58 -04001732 rcu_read_lock();
Sage Weil2f2dc052009-10-06 11:31:09 -07001733 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
Al Viro1b71fe22011-07-16 23:43:58 -04001734 struct inode *inode;
Sage Weil2f2dc052009-10-06 11:31:09 -07001735
Al Viro1b71fe22011-07-16 23:43:58 -04001736 spin_lock(&temp->d_lock);
David Howells2b0143b2015-03-17 22:25:59 +00001737 inode = d_inode(temp);
Sage Weil2f2dc052009-10-06 11:31:09 -07001738 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
Sage Weil104648a2010-03-18 10:14:30 -07001739 dout("build_path path+%d: %p SNAPDIR\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07001740 pos, temp);
1741 } else if (stop_on_nosnap && inode &&
1742 ceph_snap(inode) == CEPH_NOSNAP) {
Yehuda Sadeh9d5a09e2011-12-13 09:57:44 -08001743 spin_unlock(&temp->d_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001744 break;
1745 } else {
1746 pos -= temp->d_name.len;
Al Viro1b71fe22011-07-16 23:43:58 -04001747 if (pos < 0) {
1748 spin_unlock(&temp->d_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001749 break;
Al Viro1b71fe22011-07-16 23:43:58 -04001750 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001751 strncpy(path + pos, temp->d_name.name,
1752 temp->d_name.len);
Sage Weil2f2dc052009-10-06 11:31:09 -07001753 }
Al Viro1b71fe22011-07-16 23:43:58 -04001754 spin_unlock(&temp->d_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07001755 if (pos)
1756 path[--pos] = '/';
1757 temp = temp->d_parent;
Sage Weil2f2dc052009-10-06 11:31:09 -07001758 }
Al Viro1b71fe22011-07-16 23:43:58 -04001759 rcu_read_unlock();
1760 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
Sage Weil104648a2010-03-18 10:14:30 -07001761 pr_err("build_path did not end path lookup where "
Sage Weil2f2dc052009-10-06 11:31:09 -07001762 "expected, namelen is %d, pos is %d\n", len, pos);
1763 /* presumably this is only possible if racing with a
1764 rename of one of the parent directories (we can not
1765 lock the dentries above us to prevent this, but
1766 retrying should be harmless) */
1767 kfree(path);
1768 goto retry;
1769 }
1770
David Howells2b0143b2015-03-17 22:25:59 +00001771 *base = ceph_ino(d_inode(temp));
Sage Weil2f2dc052009-10-06 11:31:09 -07001772 *plen = len;
Sage Weil104648a2010-03-18 10:14:30 -07001773 dout("build_path on %p %d built %llx '%.*s'\n",
Al Viro84d08fa2013-07-05 18:59:33 +04001774 dentry, d_count(dentry), *base, len, path);
Sage Weil2f2dc052009-10-06 11:31:09 -07001775 return path;
1776}
1777
1778static int build_dentry_path(struct dentry *dentry,
1779 const char **ppath, int *ppathlen, u64 *pino,
1780 int *pfreepath)
1781{
1782 char *path;
1783
David Howells2b0143b2015-03-17 22:25:59 +00001784 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1785 *pino = ceph_ino(d_inode(dentry->d_parent));
Sage Weil2f2dc052009-10-06 11:31:09 -07001786 *ppath = dentry->d_name.name;
1787 *ppathlen = dentry->d_name.len;
1788 return 0;
1789 }
1790 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1791 if (IS_ERR(path))
1792 return PTR_ERR(path);
1793 *ppath = path;
1794 *pfreepath = 1;
1795 return 0;
1796}
1797
1798static int build_inode_path(struct inode *inode,
1799 const char **ppath, int *ppathlen, u64 *pino,
1800 int *pfreepath)
1801{
1802 struct dentry *dentry;
1803 char *path;
1804
1805 if (ceph_snap(inode) == CEPH_NOSNAP) {
1806 *pino = ceph_ino(inode);
1807 *ppathlen = 0;
1808 return 0;
1809 }
1810 dentry = d_find_alias(inode);
1811 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1812 dput(dentry);
1813 if (IS_ERR(path))
1814 return PTR_ERR(path);
1815 *ppath = path;
1816 *pfreepath = 1;
1817 return 0;
1818}
1819
1820/*
1821 * request arguments may be specified via an inode *, a dentry *, or
1822 * an explicit ino+path.
1823 */
1824static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1825 const char *rpath, u64 rino,
1826 const char **ppath, int *pathlen,
1827 u64 *ino, int *freepath)
1828{
1829 int r = 0;
1830
1831 if (rinode) {
1832 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1833 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1834 ceph_snap(rinode));
1835 } else if (rdentry) {
1836 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1837 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1838 *ppath);
Sage Weil795858d2011-08-15 13:02:37 -07001839 } else if (rpath || rino) {
Sage Weil2f2dc052009-10-06 11:31:09 -07001840 *ino = rino;
1841 *ppath = rpath;
David Zafmanb0000562012-10-25 10:23:46 -07001842 *pathlen = rpath ? strlen(rpath) : 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07001843 dout(" path %.*s\n", *pathlen, rpath);
1844 }
1845
1846 return r;
1847}
1848
1849/*
1850 * called under mdsc->mutex
1851 */
1852static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1853 struct ceph_mds_request *req,
Yan, Zheng6e6f0922015-02-27 08:54:08 +08001854 int mds, bool drop_cap_releases)
Sage Weil2f2dc052009-10-06 11:31:09 -07001855{
1856 struct ceph_msg *msg;
1857 struct ceph_mds_request_head *head;
1858 const char *path1 = NULL;
1859 const char *path2 = NULL;
1860 u64 ino1 = 0, ino2 = 0;
1861 int pathlen1 = 0, pathlen2 = 0;
1862 int freepath1 = 0, freepath2 = 0;
1863 int len;
1864 u16 releases;
1865 void *p, *end;
1866 int ret;
1867
1868 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1869 req->r_path1, req->r_ino1.ino,
1870 &path1, &pathlen1, &ino1, &freepath1);
1871 if (ret < 0) {
1872 msg = ERR_PTR(ret);
1873 goto out;
1874 }
1875
1876 ret = set_request_path_attr(NULL, req->r_old_dentry,
1877 req->r_path2, req->r_ino2.ino,
1878 &path2, &pathlen2, &ino2, &freepath2);
1879 if (ret < 0) {
1880 msg = ERR_PTR(ret);
1881 goto out_free1;
1882 }
1883
1884 len = sizeof(*head) +
Sage Weilb8e69062014-05-21 17:41:08 -07001885 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
Arnd Bergmann777d7382015-09-30 15:04:42 +02001886 sizeof(struct ceph_timespec);
Sage Weil2f2dc052009-10-06 11:31:09 -07001887
1888 /* calculate (max) length for cap releases */
1889 len += sizeof(struct ceph_mds_request_release) *
1890 (!!req->r_inode_drop + !!req->r_dentry_drop +
1891 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1892 if (req->r_dentry_drop)
1893 len += req->r_dentry->d_name.len;
1894 if (req->r_old_dentry_drop)
1895 len += req->r_old_dentry->d_name.len;
1896
Sage Weilb61c2762011-08-09 15:03:46 -07001897 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -07001898 if (!msg) {
1899 msg = ERR_PTR(-ENOMEM);
Sage Weil2f2dc052009-10-06 11:31:09 -07001900 goto out_free2;
Sage Weila79832f2010-04-01 16:06:19 -07001901 }
Sage Weil2f2dc052009-10-06 11:31:09 -07001902
John Spray7cfa0312014-10-30 17:15:26 +00001903 msg->hdr.version = cpu_to_le16(2);
Sage Weil6df058c2009-12-22 11:24:33 -08001904 msg->hdr.tid = cpu_to_le64(req->r_tid);
1905
Sage Weil2f2dc052009-10-06 11:31:09 -07001906 head = msg->front.iov_base;
1907 p = msg->front.iov_base + sizeof(*head);
1908 end = msg->front.iov_base + msg->front.iov_len;
1909
1910 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1911 head->op = cpu_to_le32(req->r_op);
Eric W. Biedermanff3d0042013-01-31 04:01:53 -08001912 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1913 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
Sage Weil2f2dc052009-10-06 11:31:09 -07001914 head->args = req->r_args;
1915
1916 ceph_encode_filepath(&p, end, ino1, path1);
1917 ceph_encode_filepath(&p, end, ino2, path2);
1918
Sage Weile979cf52010-07-15 14:58:39 -07001919 /* make note of release offset, in case we need to replay */
1920 req->r_request_release_offset = p - msg->front.iov_base;
1921
Sage Weil2f2dc052009-10-06 11:31:09 -07001922 /* cap releases */
1923 releases = 0;
1924 if (req->r_inode_drop)
1925 releases += ceph_encode_inode_release(&p,
David Howells2b0143b2015-03-17 22:25:59 +00001926 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
Sage Weil2f2dc052009-10-06 11:31:09 -07001927 mds, req->r_inode_drop, req->r_inode_unless, 0);
1928 if (req->r_dentry_drop)
1929 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1930 mds, req->r_dentry_drop, req->r_dentry_unless);
1931 if (req->r_old_dentry_drop)
1932 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1933 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1934 if (req->r_old_inode_drop)
1935 releases += ceph_encode_inode_release(&p,
David Howells2b0143b2015-03-17 22:25:59 +00001936 d_inode(req->r_old_dentry),
Sage Weil2f2dc052009-10-06 11:31:09 -07001937 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
Yan, Zheng6e6f0922015-02-27 08:54:08 +08001938
1939 if (drop_cap_releases) {
1940 releases = 0;
1941 p = msg->front.iov_base + req->r_request_release_offset;
1942 }
1943
Sage Weil2f2dc052009-10-06 11:31:09 -07001944 head->num_releases = cpu_to_le16(releases);
1945
Sage Weilb8e69062014-05-21 17:41:08 -07001946 /* time stamp */
Yan, Zheng1f041a82015-01-13 15:20:52 +08001947 {
1948 struct ceph_timespec ts;
1949 ceph_encode_timespec(&ts, &req->r_stamp);
1950 ceph_encode_copy(&p, &ts, sizeof(ts));
1951 }
Sage Weilb8e69062014-05-21 17:41:08 -07001952
Sage Weil2f2dc052009-10-06 11:31:09 -07001953 BUG_ON(p > end);
1954 msg->front.iov_len = p - msg->front.iov_base;
1955 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1956
Yan, Zheng25e6bae2014-09-16 19:15:28 +08001957 if (req->r_pagelist) {
1958 struct ceph_pagelist *pagelist = req->r_pagelist;
1959 atomic_inc(&pagelist->refcnt);
1960 ceph_msg_data_add_pagelist(msg, pagelist);
1961 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1962 } else {
1963 msg->hdr.data_len = 0;
Alex Elderebf18f42013-03-04 22:29:57 -06001964 }
Alex Elder02afca62013-02-14 12:16:43 -06001965
Sage Weil2f2dc052009-10-06 11:31:09 -07001966 msg->hdr.data_off = cpu_to_le16(0);
1967
1968out_free2:
1969 if (freepath2)
1970 kfree((char *)path2);
1971out_free1:
1972 if (freepath1)
1973 kfree((char *)path1);
1974out:
1975 return msg;
1976}
1977
1978/*
1979 * called under mdsc->mutex if error, under no mutex if
1980 * success.
1981 */
1982static void complete_request(struct ceph_mds_client *mdsc,
1983 struct ceph_mds_request *req)
1984{
1985 if (req->r_callback)
1986 req->r_callback(mdsc, req);
1987 else
Yehuda Sadeh03066f22010-07-27 13:11:08 -07001988 complete_all(&req->r_completion);
Sage Weil2f2dc052009-10-06 11:31:09 -07001989}
1990
1991/*
1992 * called under mdsc->mutex
1993 */
1994static int __prepare_send_request(struct ceph_mds_client *mdsc,
1995 struct ceph_mds_request *req,
Yan, Zheng6e6f0922015-02-27 08:54:08 +08001996 int mds, bool drop_cap_releases)
Sage Weil2f2dc052009-10-06 11:31:09 -07001997{
1998 struct ceph_mds_request_head *rhead;
1999 struct ceph_msg *msg;
2000 int flags = 0;
2001
Sage Weil2f2dc052009-10-06 11:31:09 -07002002 req->r_attempts++;
Greg Farnume55b71f2010-06-22 15:58:01 -07002003 if (req->r_inode) {
2004 struct ceph_cap *cap =
2005 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2006
2007 if (cap)
2008 req->r_sent_on_mseq = cap->mseq;
2009 else
2010 req->r_sent_on_mseq = -1;
2011 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002012 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2013 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2014
Sage Weil01a92f12010-07-15 13:24:32 -07002015 if (req->r_got_unsafe) {
Yan, Zhengc5c9a0b2014-07-01 16:54:34 +08002016 void *p;
Sage Weil01a92f12010-07-15 13:24:32 -07002017 /*
2018 * Replay. Do not regenerate message (and rebuild
2019 * paths, etc.); just use the original message.
2020 * Rebuilding paths will break for renames because
2021 * d_move mangles the src name.
2022 */
2023 msg = req->r_request;
2024 rhead = msg->front.iov_base;
2025
2026 flags = le32_to_cpu(rhead->flags);
2027 flags |= CEPH_MDS_FLAG_REPLAY;
2028 rhead->flags = cpu_to_le32(flags);
2029
2030 if (req->r_target_inode)
2031 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2032
2033 rhead->num_retry = req->r_attempts - 1;
Sage Weile979cf52010-07-15 14:58:39 -07002034
2035 /* remove cap/dentry releases from message */
2036 rhead->num_releases = 0;
Yan, Zhengc5c9a0b2014-07-01 16:54:34 +08002037
2038 /* time stamp */
2039 p = msg->front.iov_base + req->r_request_release_offset;
Yan, Zheng1f041a82015-01-13 15:20:52 +08002040 {
2041 struct ceph_timespec ts;
2042 ceph_encode_timespec(&ts, &req->r_stamp);
2043 ceph_encode_copy(&p, &ts, sizeof(ts));
2044 }
Yan, Zhengc5c9a0b2014-07-01 16:54:34 +08002045
2046 msg->front.iov_len = p - msg->front.iov_base;
2047 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
Sage Weil01a92f12010-07-15 13:24:32 -07002048 return 0;
2049 }
2050
Sage Weil2f2dc052009-10-06 11:31:09 -07002051 if (req->r_request) {
2052 ceph_msg_put(req->r_request);
2053 req->r_request = NULL;
2054 }
Yan, Zheng6e6f0922015-02-27 08:54:08 +08002055 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
Sage Weil2f2dc052009-10-06 11:31:09 -07002056 if (IS_ERR(msg)) {
Sage Weile1518c72010-05-13 11:19:06 -07002057 req->r_err = PTR_ERR(msg);
Sage Weila79832f2010-04-01 16:06:19 -07002058 return PTR_ERR(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002059 }
2060 req->r_request = msg;
2061
2062 rhead = msg->front.iov_base;
Sage Weil2f2dc052009-10-06 11:31:09 -07002063 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2064 if (req->r_got_unsafe)
2065 flags |= CEPH_MDS_FLAG_REPLAY;
2066 if (req->r_locked_dir)
2067 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2068 rhead->flags = cpu_to_le32(flags);
2069 rhead->num_fwd = req->r_num_fwd;
2070 rhead->num_retry = req->r_attempts - 1;
Sage Weil01a92f12010-07-15 13:24:32 -07002071 rhead->ino = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002072
2073 dout(" r_locked_dir = %p\n", req->r_locked_dir);
Sage Weil2f2dc052009-10-06 11:31:09 -07002074 return 0;
2075}
2076
2077/*
2078 * send request, or put it on the appropriate wait list.
2079 */
2080static int __do_request(struct ceph_mds_client *mdsc,
2081 struct ceph_mds_request *req)
2082{
2083 struct ceph_mds_session *session = NULL;
2084 int mds = -1;
Yan, Zheng48fec5d2015-07-01 16:27:46 +08002085 int err = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002086
Yan, Zhengeb1b8af2013-09-26 14:25:36 +08002087 if (req->r_err || req->r_got_result) {
2088 if (req->r_aborted)
2089 __unregister_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07002090 goto out;
Yan, Zhengeb1b8af2013-09-26 14:25:36 +08002091 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002092
2093 if (req->r_timeout &&
2094 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2095 dout("do_request timed out\n");
2096 err = -EIO;
2097 goto finish;
2098 }
Yan, Zheng48fec5d2015-07-01 16:27:46 +08002099 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2100 dout("do_request forced umount\n");
2101 err = -EIO;
2102 goto finish;
2103 }
Yan, Zhenge9e427f2016-11-10 16:02:06 +08002104 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2105 if (mdsc->mdsmap_err) {
2106 err = mdsc->mdsmap_err;
2107 dout("do_request mdsmap err %d\n", err);
2108 goto finish;
2109 }
Yan, Zhengcc8e8342017-01-04 16:21:58 +08002110 if (mdsc->mdsmap->m_epoch == 0) {
2111 dout("do_request no mdsmap, waiting for map\n");
2112 list_add(&req->r_wait, &mdsc->waiting_for_map);
2113 goto finish;
2114 }
Yan, Zhenge9e427f2016-11-10 16:02:06 +08002115 if (!(mdsc->fsc->mount_options->flags &
2116 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2117 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2118 err = -ENOENT;
2119 pr_info("probably no mds server is up\n");
2120 goto finish;
2121 }
2122 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002123
Sage Weildc69e2e2010-11-02 13:49:00 -07002124 put_request_session(req);
2125
Sage Weil2f2dc052009-10-06 11:31:09 -07002126 mds = __choose_mds(mdsc, req);
2127 if (mds < 0 ||
2128 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2129 dout("do_request no mds or not active, waiting for map\n");
2130 list_add(&req->r_wait, &mdsc->waiting_for_map);
2131 goto out;
2132 }
2133
2134 /* get, open session */
2135 session = __ceph_lookup_mds_session(mdsc, mds);
Sage Weil9c4239562010-03-20 20:43:28 -07002136 if (!session) {
Sage Weil2f2dc052009-10-06 11:31:09 -07002137 session = register_session(mdsc, mds);
Sage Weil9c4239562010-03-20 20:43:28 -07002138 if (IS_ERR(session)) {
2139 err = PTR_ERR(session);
2140 goto finish;
2141 }
2142 }
Sage Weildc69e2e2010-11-02 13:49:00 -07002143 req->r_session = get_session(session);
2144
Sage Weil2f2dc052009-10-06 11:31:09 -07002145 dout("do_request mds%d session %p state %s\n", mds, session,
John Spraya687eca2014-09-19 13:51:08 +01002146 ceph_session_state_name(session->s_state));
Sage Weil2f2dc052009-10-06 11:31:09 -07002147 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2148 session->s_state != CEPH_MDS_SESSION_HUNG) {
Yan, Zhengfcff4152016-09-14 16:39:51 +08002149 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2150 err = -EACCES;
2151 goto out_session;
2152 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002153 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2154 session->s_state == CEPH_MDS_SESSION_CLOSING)
2155 __open_session(mdsc, session);
2156 list_add(&req->r_wait, &session->s_waiting);
2157 goto out_session;
2158 }
2159
2160 /* send request */
Sage Weil2f2dc052009-10-06 11:31:09 -07002161 req->r_resend_mds = -1; /* forget any previous mds hint */
2162
2163 if (req->r_request_started == 0) /* note request start time */
2164 req->r_request_started = jiffies;
2165
Yan, Zheng6e6f0922015-02-27 08:54:08 +08002166 err = __prepare_send_request(mdsc, req, mds, false);
Sage Weil2f2dc052009-10-06 11:31:09 -07002167 if (!err) {
2168 ceph_msg_get(req->r_request);
2169 ceph_con_send(&session->s_con, req->r_request);
2170 }
2171
2172out_session:
2173 ceph_put_mds_session(session);
Yan, Zheng48fec5d2015-07-01 16:27:46 +08002174finish:
2175 if (err) {
2176 dout("__do_request early error %d\n", err);
2177 req->r_err = err;
2178 complete_request(mdsc, req);
2179 __unregister_request(mdsc, req);
2180 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002181out:
2182 return err;
Sage Weil2f2dc052009-10-06 11:31:09 -07002183}
2184
2185/*
2186 * called under mdsc->mutex
2187 */
2188static void __wake_requests(struct ceph_mds_client *mdsc,
2189 struct list_head *head)
2190{
Yan, Zhenged75ec22012-11-19 10:49:06 +08002191 struct ceph_mds_request *req;
2192 LIST_HEAD(tmp_list);
Sage Weil2f2dc052009-10-06 11:31:09 -07002193
Yan, Zhenged75ec22012-11-19 10:49:06 +08002194 list_splice_init(head, &tmp_list);
2195
2196 while (!list_empty(&tmp_list)) {
2197 req = list_entry(tmp_list.next,
2198 struct ceph_mds_request, r_wait);
Sage Weil2f2dc052009-10-06 11:31:09 -07002199 list_del_init(&req->r_wait);
Sage Weil7971bd92013-05-01 21:15:58 -07002200 dout(" wake request %p tid %llu\n", req, req->r_tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002201 __do_request(mdsc, req);
2202 }
2203}
2204
2205/*
2206 * Wake up threads with requests pending for @mds, so that they can
Sage Weil29790f22010-03-18 14:45:05 -07002207 * resubmit their requests to a possibly different mds.
Sage Weil2f2dc052009-10-06 11:31:09 -07002208 */
Sage Weil29790f22010-03-18 14:45:05 -07002209static void kick_requests(struct ceph_mds_client *mdsc, int mds)
Sage Weil2f2dc052009-10-06 11:31:09 -07002210{
Sage Weil44ca18f2010-02-15 12:08:46 -08002211 struct ceph_mds_request *req;
Yan, Zheng282c1052014-07-30 10:12:47 +08002212 struct rb_node *p = rb_first(&mdsc->request_tree);
Sage Weil2f2dc052009-10-06 11:31:09 -07002213
2214 dout("kick_requests mds%d\n", mds);
Yan, Zheng282c1052014-07-30 10:12:47 +08002215 while (p) {
Sage Weil44ca18f2010-02-15 12:08:46 -08002216 req = rb_entry(p, struct ceph_mds_request, r_node);
Yan, Zheng282c1052014-07-30 10:12:47 +08002217 p = rb_next(p);
Sage Weil44ca18f2010-02-15 12:08:46 -08002218 if (req->r_got_unsafe)
2219 continue;
Yan, Zheng3de22be2015-02-04 14:26:22 +08002220 if (req->r_attempts > 0)
2221 continue; /* only new requests */
Sage Weil44ca18f2010-02-15 12:08:46 -08002222 if (req->r_session &&
2223 req->r_session->s_mds == mds) {
2224 dout(" kicking tid %llu\n", req->r_tid);
Yan, Zheng03974e82014-09-11 14:28:56 +08002225 list_del_init(&req->r_wait);
Sage Weil44ca18f2010-02-15 12:08:46 -08002226 __do_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07002227 }
2228 }
2229}
2230
2231void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2232 struct ceph_mds_request *req)
2233{
2234 dout("submit_request on %p\n", req);
2235 mutex_lock(&mdsc->mutex);
2236 __register_request(mdsc, req, NULL);
2237 __do_request(mdsc, req);
2238 mutex_unlock(&mdsc->mutex);
2239}
2240
2241/*
2242 * Synchrously perform an mds request. Take care of all of the
2243 * session setup, forwarding, retry details.
2244 */
2245int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2246 struct inode *dir,
2247 struct ceph_mds_request *req)
2248{
2249 int err;
2250
2251 dout("do_request on %p\n", req);
2252
2253 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2254 if (req->r_inode)
2255 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2256 if (req->r_locked_dir)
2257 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
Sage Weil844d87c2013-02-05 13:40:09 -08002258 if (req->r_old_dentry_dir)
Sage Weil41b02e12011-07-26 11:31:14 -07002259 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2260 CEPH_CAP_PIN);
Sage Weil2f2dc052009-10-06 11:31:09 -07002261
2262 /* issue */
2263 mutex_lock(&mdsc->mutex);
2264 __register_request(mdsc, req, dir);
2265 __do_request(mdsc, req);
2266
Sage Weile1518c72010-05-13 11:19:06 -07002267 if (req->r_err) {
Sage Weil2f2dc052009-10-06 11:31:09 -07002268 err = req->r_err;
Sage Weile1518c72010-05-13 11:19:06 -07002269 goto out;
Sage Weil2f2dc052009-10-06 11:31:09 -07002270 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002271
Sage Weile1518c72010-05-13 11:19:06 -07002272 /* wait */
2273 mutex_unlock(&mdsc->mutex);
2274 dout("do_request waiting\n");
Ilya Dryomov5be73032015-05-19 12:05:38 +03002275 if (!req->r_timeout && req->r_wait_for_completion) {
Yan, Zheng9280be22014-10-14 10:33:35 +08002276 err = req->r_wait_for_completion(mdsc, req);
Sage Weile1518c72010-05-13 11:19:06 -07002277 } else {
Ilya Dryomov5be73032015-05-19 12:05:38 +03002278 long timeleft = wait_for_completion_killable_timeout(
2279 &req->r_completion,
2280 ceph_timeout_jiffies(req->r_timeout));
2281 if (timeleft > 0)
2282 err = 0;
2283 else if (!timeleft)
2284 err = -EIO; /* timed out */
2285 else
2286 err = timeleft; /* killed */
Sage Weile1518c72010-05-13 11:19:06 -07002287 }
2288 dout("do_request waited, got %d\n", err);
2289 mutex_lock(&mdsc->mutex);
2290
2291 /* only abort if we didn't race with a real reply */
2292 if (req->r_got_result) {
2293 err = le32_to_cpu(req->r_reply_info.head->result);
2294 } else if (err < 0) {
2295 dout("aborted request %lld with %d\n", req->r_tid, err);
Sage Weilb4556392010-05-13 12:01:13 -07002296
2297 /*
2298 * ensure we aren't running concurrently with
2299 * ceph_fill_trace or ceph_readdir_prepopulate, which
2300 * rely on locks (dir mutex) held by our caller.
2301 */
2302 mutex_lock(&req->r_fill_mutex);
Sage Weile1518c72010-05-13 11:19:06 -07002303 req->r_err = err;
2304 req->r_aborted = true;
Sage Weilb4556392010-05-13 12:01:13 -07002305 mutex_unlock(&req->r_fill_mutex);
Sage Weile1518c72010-05-13 11:19:06 -07002306
2307 if (req->r_locked_dir &&
Sage Weil167c9e32010-05-14 10:02:57 -07002308 (req->r_op & CEPH_MDS_OP_WRITE))
2309 ceph_invalidate_dir_request(req);
Sage Weile1518c72010-05-13 11:19:06 -07002310 } else {
2311 err = req->r_err;
2312 }
2313
2314out:
2315 mutex_unlock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07002316 dout("do_request %p done, result %d\n", req, err);
2317 return err;
2318}
2319
2320/*
Yan, Zheng2f276c52013-03-13 19:44:32 +08002321 * Invalidate dir's completeness, dentry lease state on an aborted MDS
Sage Weil167c9e32010-05-14 10:02:57 -07002322 * namespace request.
2323 */
2324void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2325{
2326 struct inode *inode = req->r_locked_dir;
Sage Weil167c9e32010-05-14 10:02:57 -07002327
Yan, Zheng2f276c52013-03-13 19:44:32 +08002328 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
Sage Weil167c9e32010-05-14 10:02:57 -07002329
Yan, Zheng2f276c52013-03-13 19:44:32 +08002330 ceph_dir_clear_complete(inode);
Sage Weil167c9e32010-05-14 10:02:57 -07002331 if (req->r_dentry)
2332 ceph_invalidate_dentry_lease(req->r_dentry);
2333 if (req->r_old_dentry)
2334 ceph_invalidate_dentry_lease(req->r_old_dentry);
2335}
2336
2337/*
Sage Weil2f2dc052009-10-06 11:31:09 -07002338 * Handle mds reply.
2339 *
2340 * We take the session mutex and parse and process the reply immediately.
2341 * This preserves the logical ordering of replies, capabilities, etc., sent
2342 * by the MDS as they are applied to our local cache.
2343 */
2344static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2345{
2346 struct ceph_mds_client *mdsc = session->s_mdsc;
2347 struct ceph_mds_request *req;
2348 struct ceph_mds_reply_head *head = msg->front.iov_base;
2349 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
Yan, Zheng982d6012014-12-23 15:30:54 +08002350 struct ceph_snap_realm *realm;
Sage Weil2f2dc052009-10-06 11:31:09 -07002351 u64 tid;
2352 int err, result;
Sage Weil2600d2d2010-02-22 15:12:16 -08002353 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07002354
Sage Weil2f2dc052009-10-06 11:31:09 -07002355 if (msg->front.iov_len < sizeof(*head)) {
2356 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08002357 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002358 return;
2359 }
2360
2361 /* get request, session */
Sage Weil6df058c2009-12-22 11:24:33 -08002362 tid = le64_to_cpu(msg->hdr.tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002363 mutex_lock(&mdsc->mutex);
Ilya Dryomovfcd00b62016-04-28 16:07:22 +02002364 req = lookup_get_request(mdsc, tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002365 if (!req) {
2366 dout("handle_reply on unknown tid %llu\n", tid);
2367 mutex_unlock(&mdsc->mutex);
2368 return;
2369 }
2370 dout("handle_reply %p\n", req);
Sage Weil2f2dc052009-10-06 11:31:09 -07002371
2372 /* correct session? */
Sage Weild96d6042010-03-20 20:50:58 -07002373 if (req->r_session != session) {
Sage Weil2f2dc052009-10-06 11:31:09 -07002374 pr_err("mdsc_handle_reply got %llu on session mds%d"
2375 " not mds%d\n", tid, session->s_mds,
2376 req->r_session ? req->r_session->s_mds : -1);
2377 mutex_unlock(&mdsc->mutex);
2378 goto out;
2379 }
2380
2381 /* dup? */
2382 if ((req->r_got_unsafe && !head->safe) ||
2383 (req->r_got_safe && head->safe)) {
Fabian Frederickf3ae1b92014-06-06 14:35:37 -07002384 pr_warn("got a dup %s reply on %llu from mds%d\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07002385 head->safe ? "safe" : "unsafe", tid, mds);
2386 mutex_unlock(&mdsc->mutex);
2387 goto out;
2388 }
Brad Hubbard1550d342015-08-18 10:18:53 +08002389 if (req->r_got_safe) {
Fabian Frederickf3ae1b92014-06-06 14:35:37 -07002390 pr_warn("got unsafe after safe on %llu from mds%d\n",
Sage Weil85792d0d2010-05-13 09:06:02 -07002391 tid, mds);
2392 mutex_unlock(&mdsc->mutex);
2393 goto out;
2394 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002395
2396 result = le32_to_cpu(head->result);
2397
2398 /*
Greg Farnume55b71f2010-06-22 15:58:01 -07002399 * Handle an ESTALE
2400 * if we're not talking to the authority, send to them
2401 * if the authority has changed while we weren't looking,
2402 * send to new authority
2403 * Otherwise we just have to return an ESTALE
Sage Weil2f2dc052009-10-06 11:31:09 -07002404 */
2405 if (result == -ESTALE) {
Greg Farnume55b71f2010-06-22 15:58:01 -07002406 dout("got ESTALE on request %llu", req->r_tid);
Yan, Zheng51da8e82014-07-14 10:48:29 +08002407 req->r_resend_mds = -1;
Yan, Zhengca18bed2013-11-22 14:21:44 +08002408 if (req->r_direct_mode != USE_AUTH_MDS) {
Greg Farnume55b71f2010-06-22 15:58:01 -07002409 dout("not using auth, setting for that now");
2410 req->r_direct_mode = USE_AUTH_MDS;
Sage Weil2f2dc052009-10-06 11:31:09 -07002411 __do_request(mdsc, req);
2412 mutex_unlock(&mdsc->mutex);
2413 goto out;
Greg Farnume55b71f2010-06-22 15:58:01 -07002414 } else {
Yan, Zhengca18bed2013-11-22 14:21:44 +08002415 int mds = __choose_mds(mdsc, req);
2416 if (mds >= 0 && mds != req->r_session->s_mds) {
2417 dout("but auth changed, so resending");
Greg Farnume55b71f2010-06-22 15:58:01 -07002418 __do_request(mdsc, req);
2419 mutex_unlock(&mdsc->mutex);
2420 goto out;
2421 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002422 }
Greg Farnume55b71f2010-06-22 15:58:01 -07002423 dout("have to return ESTALE on request %llu", req->r_tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002424 }
2425
Greg Farnume55b71f2010-06-22 15:58:01 -07002426
Sage Weil2f2dc052009-10-06 11:31:09 -07002427 if (head->safe) {
2428 req->r_got_safe = true;
2429 __unregister_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07002430
2431 if (req->r_got_unsafe) {
2432 /*
2433 * We already handled the unsafe response, now do the
2434 * cleanup. No need to examine the response; the MDS
2435 * doesn't include any result info in the safe
2436 * response. And even if it did, there is nothing
2437 * useful we could do with a revised return value.
2438 */
2439 dout("got safe reply %llu, mds%d\n", tid, mds);
2440 list_del_init(&req->r_unsafe_item);
2441
2442 /* last unsafe request during umount? */
Sage Weil44ca18f2010-02-15 12:08:46 -08002443 if (mdsc->stopping && !__get_oldest_req(mdsc))
Yehuda Sadeh03066f22010-07-27 13:11:08 -07002444 complete_all(&mdsc->safe_umount_waiters);
Sage Weil2f2dc052009-10-06 11:31:09 -07002445 mutex_unlock(&mdsc->mutex);
2446 goto out;
2447 }
Sage Weile1518c72010-05-13 11:19:06 -07002448 } else {
Sage Weil2f2dc052009-10-06 11:31:09 -07002449 req->r_got_unsafe = true;
2450 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
Yan, Zheng4c06ace2015-10-27 17:18:00 +08002451 if (req->r_unsafe_dir) {
2452 struct ceph_inode_info *ci =
2453 ceph_inode(req->r_unsafe_dir);
2454 spin_lock(&ci->i_unsafe_lock);
2455 list_add_tail(&req->r_unsafe_dir_item,
2456 &ci->i_unsafe_dirops);
2457 spin_unlock(&ci->i_unsafe_lock);
2458 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002459 }
2460
2461 dout("handle_reply tid %lld result %d\n", tid, result);
2462 rinfo = &req->r_reply_info;
Sage Weil14303d22010-12-14 17:37:52 -08002463 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
Sage Weil2f2dc052009-10-06 11:31:09 -07002464 mutex_unlock(&mdsc->mutex);
2465
2466 mutex_lock(&session->s_mutex);
2467 if (err < 0) {
Herb Shiu25933ab2010-12-01 14:14:38 -08002468 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
Sage Weil9ec7cab2009-12-14 15:13:47 -08002469 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002470 goto out_err;
2471 }
2472
2473 /* snap trace */
Yan, Zheng982d6012014-12-23 15:30:54 +08002474 realm = NULL;
Sage Weil2f2dc052009-10-06 11:31:09 -07002475 if (rinfo->snapblob_len) {
2476 down_write(&mdsc->snap_rwsem);
2477 ceph_update_snap_trace(mdsc, rinfo->snapblob,
Yan, Zheng982d6012014-12-23 15:30:54 +08002478 rinfo->snapblob + rinfo->snapblob_len,
2479 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2480 &realm);
Sage Weil2f2dc052009-10-06 11:31:09 -07002481 downgrade_write(&mdsc->snap_rwsem);
2482 } else {
2483 down_read(&mdsc->snap_rwsem);
2484 }
2485
2486 /* insert trace into our cache */
Sage Weilb4556392010-05-13 12:01:13 -07002487 mutex_lock(&req->r_fill_mutex);
Yan, Zheng315f2402016-03-07 10:34:50 +08002488 current->journal_info = req;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07002489 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
Sage Weil2f2dc052009-10-06 11:31:09 -07002490 if (err == 0) {
Sam Lang6e8575f2012-12-28 09:56:46 -08002491 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
Yan, Zheng81c6aea2013-09-18 09:44:13 +08002492 req->r_op == CEPH_MDS_OP_LSSNAP))
Sage Weil2f2dc052009-10-06 11:31:09 -07002493 ceph_readdir_prepopulate(req, req->r_session);
Yehuda Sadeh37151662010-06-17 16:16:12 -07002494 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
Sage Weil2f2dc052009-10-06 11:31:09 -07002495 }
Yan, Zheng315f2402016-03-07 10:34:50 +08002496 current->journal_info = NULL;
Sage Weilb4556392010-05-13 12:01:13 -07002497 mutex_unlock(&req->r_fill_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07002498
2499 up_read(&mdsc->snap_rwsem);
Yan, Zheng982d6012014-12-23 15:30:54 +08002500 if (realm)
2501 ceph_put_snap_realm(mdsc, realm);
Yan, Zheng68cd5b42015-10-27 18:36:06 +08002502
2503 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2504 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2505 spin_lock(&ci->i_unsafe_lock);
2506 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2507 spin_unlock(&ci->i_unsafe_lock);
2508 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002509out_err:
Sage Weile1518c72010-05-13 11:19:06 -07002510 mutex_lock(&mdsc->mutex);
2511 if (!req->r_aborted) {
2512 if (err) {
2513 req->r_err = err;
2514 } else {
Jianpeng Ma5fdb1382015-08-18 10:30:38 +08002515 req->r_reply = ceph_msg_get(msg);
Sage Weile1518c72010-05-13 11:19:06 -07002516 req->r_got_result = true;
2517 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002518 } else {
Sage Weile1518c72010-05-13 11:19:06 -07002519 dout("reply arrived after request %lld was aborted\n", tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002520 }
Sage Weile1518c72010-05-13 11:19:06 -07002521 mutex_unlock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07002522
Sage Weil2f2dc052009-10-06 11:31:09 -07002523 mutex_unlock(&session->s_mutex);
2524
2525 /* kick calling process */
2526 complete_request(mdsc, req);
2527out:
2528 ceph_mdsc_put_request(req);
2529 return;
2530}
2531
2532
2533
2534/*
2535 * handle mds notification that our request has been forwarded.
2536 */
Sage Weil2600d2d2010-02-22 15:12:16 -08002537static void handle_forward(struct ceph_mds_client *mdsc,
2538 struct ceph_mds_session *session,
2539 struct ceph_msg *msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07002540{
2541 struct ceph_mds_request *req;
Sage Weila1ea7872010-02-23 14:02:44 -08002542 u64 tid = le64_to_cpu(msg->hdr.tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002543 u32 next_mds;
2544 u32 fwd_seq;
Sage Weil2f2dc052009-10-06 11:31:09 -07002545 int err = -EINVAL;
2546 void *p = msg->front.iov_base;
2547 void *end = p + msg->front.iov_len;
Sage Weil2f2dc052009-10-06 11:31:09 -07002548
Sage Weila1ea7872010-02-23 14:02:44 -08002549 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
Sage Weilc89136e2009-10-14 09:59:09 -07002550 next_mds = ceph_decode_32(&p);
2551 fwd_seq = ceph_decode_32(&p);
Sage Weil2f2dc052009-10-06 11:31:09 -07002552
2553 mutex_lock(&mdsc->mutex);
Ilya Dryomovfcd00b62016-04-28 16:07:22 +02002554 req = lookup_get_request(mdsc, tid);
Sage Weil2f2dc052009-10-06 11:31:09 -07002555 if (!req) {
Sage Weil2a8e5e32010-05-28 16:43:16 -07002556 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07002557 goto out; /* dup reply? */
2558 }
2559
Sage Weil2a8e5e32010-05-28 16:43:16 -07002560 if (req->r_aborted) {
2561 dout("forward tid %llu aborted, unregistering\n", tid);
2562 __unregister_request(mdsc, req);
2563 } else if (fwd_seq <= req->r_num_fwd) {
2564 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07002565 tid, next_mds, req->r_num_fwd, fwd_seq);
2566 } else {
2567 /* resend. forward race not possible; mds would drop */
Sage Weil2a8e5e32010-05-28 16:43:16 -07002568 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2569 BUG_ON(req->r_err);
2570 BUG_ON(req->r_got_result);
Yan, Zheng3de22be2015-02-04 14:26:22 +08002571 req->r_attempts = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002572 req->r_num_fwd = fwd_seq;
2573 req->r_resend_mds = next_mds;
2574 put_request_session(req);
2575 __do_request(mdsc, req);
2576 }
2577 ceph_mdsc_put_request(req);
2578out:
2579 mutex_unlock(&mdsc->mutex);
2580 return;
2581
2582bad:
2583 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2584}
2585
2586/*
2587 * handle a mds session control message
2588 */
2589static void handle_session(struct ceph_mds_session *session,
2590 struct ceph_msg *msg)
2591{
2592 struct ceph_mds_client *mdsc = session->s_mdsc;
2593 u32 op;
2594 u64 seq;
Sage Weil2600d2d2010-02-22 15:12:16 -08002595 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07002596 struct ceph_mds_session_head *h = msg->front.iov_base;
2597 int wake = 0;
2598
Sage Weil2f2dc052009-10-06 11:31:09 -07002599 /* decode */
2600 if (msg->front.iov_len != sizeof(*h))
2601 goto bad;
2602 op = le32_to_cpu(h->op);
2603 seq = le64_to_cpu(h->seq);
2604
2605 mutex_lock(&mdsc->mutex);
Sage Weil2600d2d2010-02-22 15:12:16 -08002606 if (op == CEPH_SESSION_CLOSE)
2607 __unregister_session(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07002608 /* FIXME: this ttl calculation is generous */
2609 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2610 mutex_unlock(&mdsc->mutex);
2611
2612 mutex_lock(&session->s_mutex);
2613
2614 dout("handle_session mds%d %s %p state %s seq %llu\n",
2615 mds, ceph_session_op_name(op), session,
John Spraya687eca2014-09-19 13:51:08 +01002616 ceph_session_state_name(session->s_state), seq);
Sage Weil2f2dc052009-10-06 11:31:09 -07002617
2618 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2619 session->s_state = CEPH_MDS_SESSION_OPEN;
2620 pr_info("mds%d came back\n", session->s_mds);
2621 }
2622
2623 switch (op) {
2624 case CEPH_SESSION_OPEN:
Sage Weil29790f22010-03-18 14:45:05 -07002625 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2626 pr_info("mds%d reconnect success\n", session->s_mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07002627 session->s_state = CEPH_MDS_SESSION_OPEN;
2628 renewed_caps(mdsc, session, 0);
2629 wake = 1;
2630 if (mdsc->stopping)
2631 __close_session(mdsc, session);
2632 break;
2633
2634 case CEPH_SESSION_RENEWCAPS:
2635 if (session->s_renew_seq == seq)
2636 renewed_caps(mdsc, session, 1);
2637 break;
2638
2639 case CEPH_SESSION_CLOSE:
Sage Weil29790f22010-03-18 14:45:05 -07002640 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2641 pr_info("mds%d reconnect denied\n", session->s_mds);
Yan, Zheng1c841a92015-03-24 20:15:36 +08002642 cleanup_session_requests(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07002643 remove_session_caps(session);
Yan, Zheng656e4382014-09-11 14:25:18 +08002644 wake = 2; /* for good measure */
Sage Weilf3c60c52010-08-11 14:51:23 -07002645 wake_up_all(&mdsc->session_close_wq);
Sage Weil2f2dc052009-10-06 11:31:09 -07002646 break;
2647
2648 case CEPH_SESSION_STALE:
2649 pr_info("mds%d caps went stale, renewing\n",
2650 session->s_mds);
Alex Elderd8fb02a2012-01-12 17:48:10 -08002651 spin_lock(&session->s_gen_ttl_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07002652 session->s_cap_gen++;
Alex Elder1ce208a2012-01-12 17:48:11 -08002653 session->s_cap_ttl = jiffies - 1;
Alex Elderd8fb02a2012-01-12 17:48:10 -08002654 spin_unlock(&session->s_gen_ttl_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07002655 send_renew_caps(mdsc, session);
2656 break;
2657
2658 case CEPH_SESSION_RECALL_STATE:
2659 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2660 break;
2661
Yan, Zheng186e4f72013-11-22 14:48:37 +08002662 case CEPH_SESSION_FLUSHMSG:
2663 send_flushmsg_ack(mdsc, session, seq);
2664 break;
2665
Yan, Zheng03f4fcb2015-01-05 11:04:04 +08002666 case CEPH_SESSION_FORCE_RO:
2667 dout("force_session_readonly %p\n", session);
2668 spin_lock(&session->s_cap_lock);
2669 session->s_readonly = true;
2670 spin_unlock(&session->s_cap_lock);
2671 wake_up_session_caps(session, 0);
2672 break;
2673
Yan, Zhengfcff4152016-09-14 16:39:51 +08002674 case CEPH_SESSION_REJECT:
2675 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2676 pr_info("mds%d rejected session\n", session->s_mds);
2677 session->s_state = CEPH_MDS_SESSION_REJECTED;
2678 cleanup_session_requests(mdsc, session);
2679 remove_session_caps(session);
2680 wake = 2; /* for good measure */
2681 break;
2682
Sage Weil2f2dc052009-10-06 11:31:09 -07002683 default:
2684 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2685 WARN_ON(1);
2686 }
2687
2688 mutex_unlock(&session->s_mutex);
2689 if (wake) {
2690 mutex_lock(&mdsc->mutex);
2691 __wake_requests(mdsc, &session->s_waiting);
Yan, Zheng656e4382014-09-11 14:25:18 +08002692 if (wake == 2)
2693 kick_requests(mdsc, mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07002694 mutex_unlock(&mdsc->mutex);
2695 }
2696 return;
2697
2698bad:
2699 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2700 (int)msg->front.iov_len);
Sage Weil9ec7cab2009-12-14 15:13:47 -08002701 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07002702 return;
2703}
2704
2705
2706/*
2707 * called under session->mutex.
2708 */
2709static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2710 struct ceph_mds_session *session)
2711{
2712 struct ceph_mds_request *req, *nreq;
Yan, Zheng3de22be2015-02-04 14:26:22 +08002713 struct rb_node *p;
Sage Weil2f2dc052009-10-06 11:31:09 -07002714 int err;
2715
2716 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2717
2718 mutex_lock(&mdsc->mutex);
2719 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
Yan, Zheng6e6f0922015-02-27 08:54:08 +08002720 err = __prepare_send_request(mdsc, req, session->s_mds, true);
Sage Weil2f2dc052009-10-06 11:31:09 -07002721 if (!err) {
2722 ceph_msg_get(req->r_request);
2723 ceph_con_send(&session->s_con, req->r_request);
2724 }
2725 }
Yan, Zheng3de22be2015-02-04 14:26:22 +08002726
2727 /*
2728 * also re-send old requests when MDS enters reconnect stage. So that MDS
2729 * can process completed request in clientreplay stage.
2730 */
2731 p = rb_first(&mdsc->request_tree);
2732 while (p) {
2733 req = rb_entry(p, struct ceph_mds_request, r_node);
2734 p = rb_next(p);
2735 if (req->r_got_unsafe)
2736 continue;
2737 if (req->r_attempts == 0)
2738 continue; /* only old requests */
2739 if (req->r_session &&
2740 req->r_session->s_mds == session->s_mds) {
Yan, Zheng6e6f0922015-02-27 08:54:08 +08002741 err = __prepare_send_request(mdsc, req,
2742 session->s_mds, true);
Yan, Zheng3de22be2015-02-04 14:26:22 +08002743 if (!err) {
2744 ceph_msg_get(req->r_request);
2745 ceph_con_send(&session->s_con, req->r_request);
2746 }
2747 }
2748 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002749 mutex_unlock(&mdsc->mutex);
2750}
2751
2752/*
2753 * Encode information about a cap for a reconnect with the MDS.
2754 */
Sage Weil2f2dc052009-10-06 11:31:09 -07002755static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2756 void *arg)
2757{
Sage Weil20cb34a2010-05-12 15:21:32 -07002758 union {
2759 struct ceph_mds_cap_reconnect v2;
2760 struct ceph_mds_cap_reconnect_v1 v1;
2761 } rec;
Sage Weil2f2dc052009-10-06 11:31:09 -07002762 struct ceph_inode_info *ci;
Sage Weil20cb34a2010-05-12 15:21:32 -07002763 struct ceph_reconnect_state *recon_state = arg;
2764 struct ceph_pagelist *pagelist = recon_state->pagelist;
Sage Weil2f2dc052009-10-06 11:31:09 -07002765 char *path;
2766 int pathlen, err;
2767 u64 pathbase;
Yan, Zheng3469ed02016-07-05 09:32:31 +08002768 u64 snap_follows;
Sage Weil2f2dc052009-10-06 11:31:09 -07002769 struct dentry *dentry;
2770
2771 ci = cap->ci;
2772
2773 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2774 inode, ceph_vinop(inode), cap, cap->cap_id,
2775 ceph_cap_string(cap->issued));
Sage Weil93cea5b2009-12-23 12:21:51 -08002776 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2777 if (err)
2778 return err;
Sage Weil2f2dc052009-10-06 11:31:09 -07002779
2780 dentry = d_find_alias(inode);
2781 if (dentry) {
2782 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2783 if (IS_ERR(path)) {
2784 err = PTR_ERR(path);
Sage Weile072f8a2010-08-26 09:26:37 -07002785 goto out_dput;
Sage Weil2f2dc052009-10-06 11:31:09 -07002786 }
2787 } else {
2788 path = NULL;
2789 pathlen = 0;
Ilya Dryomov4eacd4c2016-08-09 16:12:09 +02002790 pathbase = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002791 }
Sage Weil2f2dc052009-10-06 11:31:09 -07002792
Sage Weilbe655592011-11-30 09:47:09 -08002793 spin_lock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07002794 cap->seq = 0; /* reset cap seq */
2795 cap->issue_seq = 0; /* and issue_seq */
Yan, Zheng667ca052013-05-31 16:25:36 +08002796 cap->mseq = 0; /* and migrate_seq */
Yan, Zheng99a9c272013-09-22 11:08:14 +08002797 cap->cap_gen = cap->session->s_cap_gen;
Sage Weil20cb34a2010-05-12 15:21:32 -07002798
Yan, Zheng121f22a2016-07-04 22:05:18 +08002799 if (recon_state->msg_version >= 2) {
Sage Weil20cb34a2010-05-12 15:21:32 -07002800 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2801 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2802 rec.v2.issued = cpu_to_le32(cap->issued);
2803 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2804 rec.v2.pathbase = cpu_to_le64(pathbase);
2805 rec.v2.flock_len = 0;
Sage Weil20cb34a2010-05-12 15:21:32 -07002806 } else {
2807 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2808 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2809 rec.v1.issued = cpu_to_le32(cap->issued);
2810 rec.v1.size = cpu_to_le64(inode->i_size);
2811 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2812 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2813 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2814 rec.v1.pathbase = cpu_to_le64(pathbase);
Sage Weil20cb34a2010-05-12 15:21:32 -07002815 }
Yan, Zheng3469ed02016-07-05 09:32:31 +08002816
2817 if (list_empty(&ci->i_cap_snaps)) {
2818 snap_follows = 0;
2819 } else {
2820 struct ceph_cap_snap *capsnap =
2821 list_first_entry(&ci->i_cap_snaps,
2822 struct ceph_cap_snap, ci_item);
2823 snap_follows = capsnap->follows;
Sage Weil93cea5b2009-12-23 12:21:51 -08002824 }
Sage Weilbe655592011-11-30 09:47:09 -08002825 spin_unlock(&ci->i_ceph_lock);
Sage Weil2f2dc052009-10-06 11:31:09 -07002826
Yan, Zheng121f22a2016-07-04 22:05:18 +08002827 if (recon_state->msg_version >= 2) {
Greg Farnum40819f62010-08-02 15:34:23 -07002828 int num_fcntl_locks, num_flock_locks;
Jim Schutt39be95e2013-05-15 13:03:35 -05002829 struct ceph_filelock *flocks;
Yan, Zheng121f22a2016-07-04 22:05:18 +08002830 size_t struct_len, total_len = 0;
2831 u8 struct_v = 0;
Greg Farnum40819f62010-08-02 15:34:23 -07002832
Jim Schutt39be95e2013-05-15 13:03:35 -05002833encode_again:
Jim Schutt39be95e2013-05-15 13:03:35 -05002834 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
Jim Schutt39be95e2013-05-15 13:03:35 -05002835 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2836 sizeof(struct ceph_filelock), GFP_NOFS);
2837 if (!flocks) {
2838 err = -ENOMEM;
2839 goto out_free;
2840 }
Jim Schutt39be95e2013-05-15 13:03:35 -05002841 err = ceph_encode_locks_to_buffer(inode, flocks,
2842 num_fcntl_locks,
2843 num_flock_locks);
Jim Schutt39be95e2013-05-15 13:03:35 -05002844 if (err) {
2845 kfree(flocks);
2846 if (err == -ENOSPC)
2847 goto encode_again;
2848 goto out_free;
2849 }
Yan, Zheng121f22a2016-07-04 22:05:18 +08002850
2851 if (recon_state->msg_version >= 3) {
2852 /* version, compat_version and struct_len */
2853 total_len = 2 * sizeof(u8) + sizeof(u32);
Yan, Zheng3469ed02016-07-05 09:32:31 +08002854 struct_v = 2;
Yan, Zheng121f22a2016-07-04 22:05:18 +08002855 }
Jim Schutt39be95e2013-05-15 13:03:35 -05002856 /*
2857 * number of encoded locks is stable, so copy to pagelist
2858 */
Yan, Zheng121f22a2016-07-04 22:05:18 +08002859 struct_len = 2 * sizeof(u32) +
2860 (num_fcntl_locks + num_flock_locks) *
2861 sizeof(struct ceph_filelock);
2862 rec.v2.flock_len = cpu_to_le32(struct_len);
2863
2864 struct_len += sizeof(rec.v2);
2865 struct_len += sizeof(u32) + pathlen;
2866
Yan, Zheng3469ed02016-07-05 09:32:31 +08002867 if (struct_v >= 2)
2868 struct_len += sizeof(u64); /* snap_follows */
2869
Yan, Zheng121f22a2016-07-04 22:05:18 +08002870 total_len += struct_len;
2871 err = ceph_pagelist_reserve(pagelist, total_len);
2872
2873 if (!err) {
2874 if (recon_state->msg_version >= 3) {
2875 ceph_pagelist_encode_8(pagelist, struct_v);
2876 ceph_pagelist_encode_8(pagelist, 1);
2877 ceph_pagelist_encode_32(pagelist, struct_len);
2878 }
2879 ceph_pagelist_encode_string(pagelist, path, pathlen);
2880 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2881 ceph_locks_to_pagelist(flocks, pagelist,
2882 num_fcntl_locks,
2883 num_flock_locks);
Yan, Zheng3469ed02016-07-05 09:32:31 +08002884 if (struct_v >= 2)
2885 ceph_pagelist_encode_64(pagelist, snap_follows);
Yan, Zheng121f22a2016-07-04 22:05:18 +08002886 }
Jim Schutt39be95e2013-05-15 13:03:35 -05002887 kfree(flocks);
Sage Weil3612abb2010-09-07 15:59:27 -07002888 } else {
Yan, Zheng121f22a2016-07-04 22:05:18 +08002889 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2890 err = ceph_pagelist_reserve(pagelist, size);
2891 if (!err) {
2892 ceph_pagelist_encode_string(pagelist, path, pathlen);
2893 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2894 }
Greg Farnum40819f62010-08-02 15:34:23 -07002895 }
Yan, Zheng44c99752013-09-22 10:28:10 +08002896
2897 recon_state->nr_caps++;
Sage Weile072f8a2010-08-26 09:26:37 -07002898out_free:
Sage Weil2f2dc052009-10-06 11:31:09 -07002899 kfree(path);
Sage Weile072f8a2010-08-26 09:26:37 -07002900out_dput:
Sage Weil2f2dc052009-10-06 11:31:09 -07002901 dput(dentry);
Sage Weil93cea5b2009-12-23 12:21:51 -08002902 return err;
Sage Weil2f2dc052009-10-06 11:31:09 -07002903}
2904
2905
2906/*
2907 * If an MDS fails and recovers, clients need to reconnect in order to
2908 * reestablish shared state. This includes all caps issued through
2909 * this session _and_ the snap_realm hierarchy. Because it's not
2910 * clear which snap realms the mds cares about, we send everything we
2911 * know about.. that ensures we'll then get any new info the
2912 * recovering MDS might have.
2913 *
2914 * This is a relatively heavyweight operation, but it's rare.
2915 *
2916 * called with mdsc->mutex held.
2917 */
Sage Weil34b6c852010-05-10 16:31:25 -07002918static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2919 struct ceph_mds_session *session)
Sage Weil2f2dc052009-10-06 11:31:09 -07002920{
Sage Weil2f2dc052009-10-06 11:31:09 -07002921 struct ceph_msg *reply;
Sage Weila105f002010-02-15 14:37:55 -08002922 struct rb_node *p;
Sage Weil34b6c852010-05-10 16:31:25 -07002923 int mds = session->s_mds;
Sage Weil9abf82b2010-05-10 21:58:38 -07002924 int err = -ENOMEM;
Yan, Zheng44c99752013-09-22 10:28:10 +08002925 int s_nr_caps;
Sage Weil93cea5b2009-12-23 12:21:51 -08002926 struct ceph_pagelist *pagelist;
Sage Weil20cb34a2010-05-12 15:21:32 -07002927 struct ceph_reconnect_state recon_state;
Sage Weil2f2dc052009-10-06 11:31:09 -07002928
Sage Weil34b6c852010-05-10 16:31:25 -07002929 pr_info("mds%d reconnect start\n", mds);
Sage Weil2f2dc052009-10-06 11:31:09 -07002930
Sage Weil93cea5b2009-12-23 12:21:51 -08002931 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2932 if (!pagelist)
2933 goto fail_nopagelist;
2934 ceph_pagelist_init(pagelist);
2935
Sage Weilb61c2762011-08-09 15:03:46 -07002936 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -07002937 if (!reply)
Sage Weil93cea5b2009-12-23 12:21:51 -08002938 goto fail_nomsg;
Sage Weil93cea5b2009-12-23 12:21:51 -08002939
Sage Weil34b6c852010-05-10 16:31:25 -07002940 mutex_lock(&session->s_mutex);
2941 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2942 session->s_seq = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07002943
Sage Weil2f2dc052009-10-06 11:31:09 -07002944 dout("session %p state %s\n", session,
John Spraya687eca2014-09-19 13:51:08 +01002945 ceph_session_state_name(session->s_state));
Sage Weil2f2dc052009-10-06 11:31:09 -07002946
Yan, Zheng99a9c272013-09-22 11:08:14 +08002947 spin_lock(&session->s_gen_ttl_lock);
2948 session->s_cap_gen++;
2949 spin_unlock(&session->s_gen_ttl_lock);
2950
2951 spin_lock(&session->s_cap_lock);
Yan, Zheng03f4fcb2015-01-05 11:04:04 +08002952 /* don't know if session is readonly */
2953 session->s_readonly = 0;
Yan, Zheng99a9c272013-09-22 11:08:14 +08002954 /*
2955 * notify __ceph_remove_cap() that we are composing cap reconnect.
2956 * If a cap get released before being added to the cap reconnect,
2957 * __ceph_remove_cap() should skip queuing cap release.
2958 */
2959 session->s_cap_reconnect = 1;
Sage Weile01a5942010-05-10 15:36:44 -07002960 /* drop old cap expires; we're about to reestablish that state */
Yan, Zheng745a8e32015-05-14 17:22:42 +08002961 cleanup_cap_releases(mdsc, session);
Sage Weile01a5942010-05-10 15:36:44 -07002962
Yan, Zheng5d233712014-09-10 16:56:23 +08002963 /* trim unused caps to reduce MDS's cache rejoin time */
Yan, Zhengc0bd50e2015-04-07 15:51:08 +08002964 if (mdsc->fsc->sb->s_root)
2965 shrink_dcache_parent(mdsc->fsc->sb->s_root);
Yan, Zheng5d233712014-09-10 16:56:23 +08002966
2967 ceph_con_close(&session->s_con);
2968 ceph_con_open(&session->s_con,
2969 CEPH_ENTITY_TYPE_MDS, mds,
2970 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2971
2972 /* replay unsafe requests */
2973 replay_unsafe_requests(mdsc, session);
2974
2975 down_read(&mdsc->snap_rwsem);
2976
Sage Weil2f2dc052009-10-06 11:31:09 -07002977 /* traverse this session's caps */
Yan, Zheng44c99752013-09-22 10:28:10 +08002978 s_nr_caps = session->s_nr_caps;
2979 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
Sage Weil93cea5b2009-12-23 12:21:51 -08002980 if (err)
2981 goto fail;
Sage Weil20cb34a2010-05-12 15:21:32 -07002982
Yan, Zheng44c99752013-09-22 10:28:10 +08002983 recon_state.nr_caps = 0;
Sage Weil20cb34a2010-05-12 15:21:32 -07002984 recon_state.pagelist = pagelist;
Yan, Zheng121f22a2016-07-04 22:05:18 +08002985 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
2986 recon_state.msg_version = 3;
2987 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
2988 recon_state.msg_version = 2;
2989 else
2990 recon_state.msg_version = 1;
Sage Weil20cb34a2010-05-12 15:21:32 -07002991 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
Sage Weil2f2dc052009-10-06 11:31:09 -07002992 if (err < 0)
Sage Weil9abf82b2010-05-10 21:58:38 -07002993 goto fail;
Sage Weil2f2dc052009-10-06 11:31:09 -07002994
Yan, Zheng99a9c272013-09-22 11:08:14 +08002995 spin_lock(&session->s_cap_lock);
2996 session->s_cap_reconnect = 0;
2997 spin_unlock(&session->s_cap_lock);
2998
Sage Weil2f2dc052009-10-06 11:31:09 -07002999 /*
3000 * snaprealms. we provide mds with the ino, seq (version), and
3001 * parent for all of our realms. If the mds has any newer info,
3002 * it will tell us.
3003 */
Sage Weila105f002010-02-15 14:37:55 -08003004 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3005 struct ceph_snap_realm *realm =
3006 rb_entry(p, struct ceph_snap_realm, node);
Sage Weil93cea5b2009-12-23 12:21:51 -08003007 struct ceph_mds_snaprealm_reconnect sr_rec;
Sage Weil2f2dc052009-10-06 11:31:09 -07003008
3009 dout(" adding snap realm %llx seq %lld parent %llx\n",
3010 realm->ino, realm->seq, realm->parent_ino);
Sage Weil93cea5b2009-12-23 12:21:51 -08003011 sr_rec.ino = cpu_to_le64(realm->ino);
3012 sr_rec.seq = cpu_to_le64(realm->seq);
3013 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3014 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3015 if (err)
3016 goto fail;
Sage Weil2f2dc052009-10-06 11:31:09 -07003017 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003018
Yan, Zheng121f22a2016-07-04 22:05:18 +08003019 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
Yan, Zheng44c99752013-09-22 10:28:10 +08003020
3021 /* raced with cap release? */
3022 if (s_nr_caps != recon_state.nr_caps) {
3023 struct page *page = list_first_entry(&pagelist->head,
3024 struct page, lru);
3025 __le32 *addr = kmap_atomic(page);
3026 *addr = cpu_to_le32(recon_state.nr_caps);
3027 kunmap_atomic(addr);
Alex Elderebf18f42013-03-04 22:29:57 -06003028 }
Yan, Zheng44c99752013-09-22 10:28:10 +08003029
3030 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3031 ceph_msg_data_add_pagelist(reply, pagelist);
Yan, Zhenge548e9b2015-06-10 15:17:56 +08003032
3033 ceph_early_kick_flushing_caps(mdsc, session);
3034
Sage Weil2f2dc052009-10-06 11:31:09 -07003035 ceph_con_send(&session->s_con, reply);
3036
Sage Weil9abf82b2010-05-10 21:58:38 -07003037 mutex_unlock(&session->s_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07003038
Sage Weil9abf82b2010-05-10 21:58:38 -07003039 mutex_lock(&mdsc->mutex);
3040 __wake_requests(mdsc, &session->s_waiting);
3041 mutex_unlock(&mdsc->mutex);
3042
Sage Weil2f2dc052009-10-06 11:31:09 -07003043 up_read(&mdsc->snap_rwsem);
Sage Weil2f2dc052009-10-06 11:31:09 -07003044 return;
3045
Sage Weil93cea5b2009-12-23 12:21:51 -08003046fail:
Sage Weil2f2dc052009-10-06 11:31:09 -07003047 ceph_msg_put(reply);
Sage Weil9abf82b2010-05-10 21:58:38 -07003048 up_read(&mdsc->snap_rwsem);
3049 mutex_unlock(&session->s_mutex);
Sage Weil93cea5b2009-12-23 12:21:51 -08003050fail_nomsg:
3051 ceph_pagelist_release(pagelist);
Sage Weil93cea5b2009-12-23 12:21:51 -08003052fail_nopagelist:
Sage Weil9abf82b2010-05-10 21:58:38 -07003053 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
Sage Weil9abf82b2010-05-10 21:58:38 -07003054 return;
Sage Weil2f2dc052009-10-06 11:31:09 -07003055}
3056
3057
3058/*
3059 * compare old and new mdsmaps, kicking requests
3060 * and closing out old connections as necessary
3061 *
3062 * called under mdsc->mutex.
3063 */
3064static void check_new_map(struct ceph_mds_client *mdsc,
3065 struct ceph_mdsmap *newmap,
3066 struct ceph_mdsmap *oldmap)
3067{
3068 int i;
3069 int oldstate, newstate;
3070 struct ceph_mds_session *s;
3071
3072 dout("check_new_map new %u old %u\n",
3073 newmap->m_epoch, oldmap->m_epoch);
3074
3075 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3076 if (mdsc->sessions[i] == NULL)
3077 continue;
3078 s = mdsc->sessions[i];
3079 oldstate = ceph_mdsmap_get_state(oldmap, i);
3080 newstate = ceph_mdsmap_get_state(newmap, i);
3081
Sage Weil0deb01c2010-06-17 14:19:01 -07003082 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
Sage Weil2f2dc052009-10-06 11:31:09 -07003083 i, ceph_mds_state_name(oldstate),
Sage Weil0deb01c2010-06-17 14:19:01 -07003084 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
Sage Weil2f2dc052009-10-06 11:31:09 -07003085 ceph_mds_state_name(newstate),
Sage Weil0deb01c2010-06-17 14:19:01 -07003086 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
John Spraya687eca2014-09-19 13:51:08 +01003087 ceph_session_state_name(s->s_state));
Sage Weil2f2dc052009-10-06 11:31:09 -07003088
Yan, Zheng3e8f43a2012-09-20 17:42:25 +08003089 if (i >= newmap->m_max_mds ||
3090 memcmp(ceph_mdsmap_get_addr(oldmap, i),
Sage Weil2f2dc052009-10-06 11:31:09 -07003091 ceph_mdsmap_get_addr(newmap, i),
3092 sizeof(struct ceph_entity_addr))) {
3093 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3094 /* the session never opened, just close it
3095 * out now */
3096 __wake_requests(mdsc, &s->s_waiting);
Sage Weil2600d2d2010-02-22 15:12:16 -08003097 __unregister_session(mdsc, s);
Sage Weil2f2dc052009-10-06 11:31:09 -07003098 } else {
3099 /* just close it */
3100 mutex_unlock(&mdsc->mutex);
3101 mutex_lock(&s->s_mutex);
3102 mutex_lock(&mdsc->mutex);
3103 ceph_con_close(&s->s_con);
3104 mutex_unlock(&s->s_mutex);
3105 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3106 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003107 } else if (oldstate == newstate) {
3108 continue; /* nothing new with this mds */
3109 }
3110
3111 /*
3112 * send reconnect?
3113 */
3114 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
Sage Weil34b6c852010-05-10 16:31:25 -07003115 newstate >= CEPH_MDS_STATE_RECONNECT) {
3116 mutex_unlock(&mdsc->mutex);
3117 send_mds_reconnect(mdsc, s);
3118 mutex_lock(&mdsc->mutex);
3119 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003120
3121 /*
Sage Weil29790f22010-03-18 14:45:05 -07003122 * kick request on any mds that has gone active.
Sage Weil2f2dc052009-10-06 11:31:09 -07003123 */
3124 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3125 newstate >= CEPH_MDS_STATE_ACTIVE) {
Sage Weil29790f22010-03-18 14:45:05 -07003126 if (oldstate != CEPH_MDS_STATE_CREATING &&
3127 oldstate != CEPH_MDS_STATE_STARTING)
3128 pr_info("mds%d recovery completed\n", s->s_mds);
3129 kick_requests(mdsc, i);
Sage Weil2f2dc052009-10-06 11:31:09 -07003130 ceph_kick_flushing_caps(mdsc, s);
Sage Weil0dc25702009-11-20 13:43:45 -08003131 wake_up_session_caps(s, 1);
Sage Weil2f2dc052009-10-06 11:31:09 -07003132 }
3133 }
Sage Weilcb170a22010-06-21 13:38:35 -07003134
3135 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3136 s = mdsc->sessions[i];
3137 if (!s)
3138 continue;
3139 if (!ceph_mdsmap_is_laggy(newmap, i))
3140 continue;
3141 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3142 s->s_state == CEPH_MDS_SESSION_HUNG ||
3143 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3144 dout(" connecting to export targets of laggy mds%d\n",
3145 i);
3146 __open_export_target_sessions(mdsc, s);
3147 }
3148 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003149}
3150
3151
3152
3153/*
3154 * leases
3155 */
3156
3157/*
3158 * caller must hold session s_mutex, dentry->d_lock
3159 */
3160void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3161{
3162 struct ceph_dentry_info *di = ceph_dentry(dentry);
3163
3164 ceph_put_mds_session(di->lease_session);
3165 di->lease_session = NULL;
3166}
3167
Sage Weil2600d2d2010-02-22 15:12:16 -08003168static void handle_lease(struct ceph_mds_client *mdsc,
3169 struct ceph_mds_session *session,
3170 struct ceph_msg *msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07003171{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003172 struct super_block *sb = mdsc->fsc->sb;
Sage Weil2f2dc052009-10-06 11:31:09 -07003173 struct inode *inode;
Sage Weil2f2dc052009-10-06 11:31:09 -07003174 struct dentry *parent, *dentry;
3175 struct ceph_dentry_info *di;
Sage Weil2600d2d2010-02-22 15:12:16 -08003176 int mds = session->s_mds;
Sage Weil2f2dc052009-10-06 11:31:09 -07003177 struct ceph_mds_lease *h = msg->front.iov_base;
Sage Weil1e5ea232010-06-04 10:05:40 -07003178 u32 seq;
Sage Weil2f2dc052009-10-06 11:31:09 -07003179 struct ceph_vino vino;
Sage Weil2f2dc052009-10-06 11:31:09 -07003180 struct qstr dname;
3181 int release = 0;
3182
Sage Weil2f2dc052009-10-06 11:31:09 -07003183 dout("handle_lease from mds%d\n", mds);
3184
3185 /* decode */
3186 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3187 goto bad;
3188 vino.ino = le64_to_cpu(h->ino);
3189 vino.snap = CEPH_NOSNAP;
Sage Weil1e5ea232010-06-04 10:05:40 -07003190 seq = le32_to_cpu(h->seq);
Sage Weil2f2dc052009-10-06 11:31:09 -07003191 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3192 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3193 if (dname.len != get_unaligned_le32(h+1))
3194 goto bad;
3195
Sage Weil2f2dc052009-10-06 11:31:09 -07003196 /* lookup inode */
3197 inode = ceph_find_inode(sb, vino);
Sage Weil2f90b852011-07-26 11:28:25 -07003198 dout("handle_lease %s, ino %llx %p %.*s\n",
3199 ceph_lease_op_name(h->action), vino.ino, inode,
Sage Weil1e5ea232010-06-04 10:05:40 -07003200 dname.len, dname.name);
Yan, Zheng6cd3bca2014-09-17 07:45:12 +08003201
3202 mutex_lock(&session->s_mutex);
3203 session->s_seq++;
3204
Sage Weil2f2dc052009-10-06 11:31:09 -07003205 if (inode == NULL) {
3206 dout("handle_lease no inode %llx\n", vino.ino);
3207 goto release;
3208 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003209
3210 /* dentry */
3211 parent = d_find_alias(inode);
3212 if (!parent) {
3213 dout("no parent dentry on inode %p\n", inode);
3214 WARN_ON(1);
3215 goto release; /* hrm... */
3216 }
Linus Torvalds8387ff22016-06-10 07:51:30 -07003217 dname.hash = full_name_hash(parent, dname.name, dname.len);
Sage Weil2f2dc052009-10-06 11:31:09 -07003218 dentry = d_lookup(parent, &dname);
3219 dput(parent);
3220 if (!dentry)
3221 goto release;
3222
3223 spin_lock(&dentry->d_lock);
3224 di = ceph_dentry(dentry);
3225 switch (h->action) {
3226 case CEPH_MDS_LEASE_REVOKE:
Sage Weil3d8eb7a2011-11-11 09:48:53 -08003227 if (di->lease_session == session) {
Sage Weil1e5ea232010-06-04 10:05:40 -07003228 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3229 h->seq = cpu_to_le32(di->lease_seq);
Sage Weil2f2dc052009-10-06 11:31:09 -07003230 __ceph_mdsc_drop_dentry_lease(dentry);
3231 }
3232 release = 1;
3233 break;
3234
3235 case CEPH_MDS_LEASE_RENEW:
Sage Weil3d8eb7a2011-11-11 09:48:53 -08003236 if (di->lease_session == session &&
Sage Weil2f2dc052009-10-06 11:31:09 -07003237 di->lease_gen == session->s_cap_gen &&
3238 di->lease_renew_from &&
3239 di->lease_renew_after == 0) {
3240 unsigned long duration =
Nicholas Mc Guire3563dbdd2015-02-06 06:52:17 -05003241 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
Sage Weil2f2dc052009-10-06 11:31:09 -07003242
Sage Weil1e5ea232010-06-04 10:05:40 -07003243 di->lease_seq = seq;
Miklos Szeredi9b16f03c2016-06-22 16:35:04 +02003244 di->time = di->lease_renew_from + duration;
Sage Weil2f2dc052009-10-06 11:31:09 -07003245 di->lease_renew_after = di->lease_renew_from +
3246 (duration >> 1);
3247 di->lease_renew_from = 0;
3248 }
3249 break;
3250 }
3251 spin_unlock(&dentry->d_lock);
3252 dput(dentry);
3253
3254 if (!release)
3255 goto out;
3256
3257release:
3258 /* let's just reuse the same message */
3259 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3260 ceph_msg_get(msg);
3261 ceph_con_send(&session->s_con, msg);
3262
3263out:
3264 iput(inode);
3265 mutex_unlock(&session->s_mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07003266 return;
3267
3268bad:
3269 pr_err("corrupt lease message\n");
Sage Weil9ec7cab2009-12-14 15:13:47 -08003270 ceph_msg_dump(msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07003271}
3272
3273void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3274 struct inode *inode,
3275 struct dentry *dentry, char action,
3276 u32 seq)
3277{
3278 struct ceph_msg *msg;
3279 struct ceph_mds_lease *lease;
3280 int len = sizeof(*lease) + sizeof(u32);
3281 int dnamelen = 0;
3282
3283 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3284 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3285 dnamelen = dentry->d_name.len;
3286 len += dnamelen;
3287
Sage Weilb61c2762011-08-09 15:03:46 -07003288 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
Sage Weila79832f2010-04-01 16:06:19 -07003289 if (!msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07003290 return;
3291 lease = msg->front.iov_base;
3292 lease->action = action;
Sage Weil2f2dc052009-10-06 11:31:09 -07003293 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3294 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3295 lease->seq = cpu_to_le32(seq);
3296 put_unaligned_le32(dnamelen, lease + 1);
3297 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3298
3299 /*
3300 * if this is a preemptive lease RELEASE, no need to
3301 * flush request stream, since the actual request will
3302 * soon follow.
3303 */
3304 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3305
3306 ceph_con_send(&session->s_con, msg);
3307}
3308
3309/*
Sage Weil2f2dc052009-10-06 11:31:09 -07003310 * drop all leases (and dentry refs) in preparation for umount
3311 */
3312static void drop_leases(struct ceph_mds_client *mdsc)
3313{
3314 int i;
3315
3316 dout("drop_leases\n");
3317 mutex_lock(&mdsc->mutex);
3318 for (i = 0; i < mdsc->max_sessions; i++) {
3319 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3320 if (!s)
3321 continue;
3322 mutex_unlock(&mdsc->mutex);
3323 mutex_lock(&s->s_mutex);
3324 mutex_unlock(&s->s_mutex);
3325 ceph_put_mds_session(s);
3326 mutex_lock(&mdsc->mutex);
3327 }
3328 mutex_unlock(&mdsc->mutex);
3329}
3330
3331
3332
3333/*
3334 * delayed work -- periodically trim expired leases, renew caps with mds
3335 */
3336static void schedule_delayed(struct ceph_mds_client *mdsc)
3337{
3338 int delay = 5;
3339 unsigned hz = round_jiffies_relative(HZ * delay);
3340 schedule_delayed_work(&mdsc->delayed_work, hz);
3341}
3342
3343static void delayed_work(struct work_struct *work)
3344{
3345 int i;
3346 struct ceph_mds_client *mdsc =
3347 container_of(work, struct ceph_mds_client, delayed_work.work);
3348 int renew_interval;
3349 int renew_caps;
3350
3351 dout("mdsc delayed_work\n");
Sage Weilafcdaea2009-10-14 14:27:38 -07003352 ceph_check_delayed_caps(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07003353
3354 mutex_lock(&mdsc->mutex);
3355 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3356 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3357 mdsc->last_renew_caps);
3358 if (renew_caps)
3359 mdsc->last_renew_caps = jiffies;
3360
3361 for (i = 0; i < mdsc->max_sessions; i++) {
3362 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3363 if (s == NULL)
3364 continue;
3365 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3366 dout("resending session close request for mds%d\n",
3367 s->s_mds);
3368 request_close_session(mdsc, s);
3369 ceph_put_mds_session(s);
3370 continue;
3371 }
3372 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3373 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3374 s->s_state = CEPH_MDS_SESSION_HUNG;
3375 pr_info("mds%d hung\n", s->s_mds);
3376 }
3377 }
3378 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3379 /* this mds is failed or recovering, just wait */
3380 ceph_put_mds_session(s);
3381 continue;
3382 }
3383 mutex_unlock(&mdsc->mutex);
3384
3385 mutex_lock(&s->s_mutex);
3386 if (renew_caps)
3387 send_renew_caps(mdsc, s);
3388 else
3389 ceph_con_keepalive(&s->s_con);
Sage Weilaab53dd2010-03-17 16:30:21 -07003390 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3391 s->s_state == CEPH_MDS_SESSION_HUNG)
Sage Weil3d7ded42010-06-09 16:47:10 -07003392 ceph_send_cap_releases(mdsc, s);
Sage Weil2f2dc052009-10-06 11:31:09 -07003393 mutex_unlock(&s->s_mutex);
3394 ceph_put_mds_session(s);
3395
3396 mutex_lock(&mdsc->mutex);
3397 }
3398 mutex_unlock(&mdsc->mutex);
3399
3400 schedule_delayed(mdsc);
3401}
3402
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003403int ceph_mdsc_init(struct ceph_fs_client *fsc)
Sage Weil2f2dc052009-10-06 11:31:09 -07003404
Sage Weil2f2dc052009-10-06 11:31:09 -07003405{
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003406 struct ceph_mds_client *mdsc;
3407
3408 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3409 if (!mdsc)
3410 return -ENOMEM;
3411 mdsc->fsc = fsc;
3412 fsc->mdsc = mdsc;
Sage Weil2f2dc052009-10-06 11:31:09 -07003413 mutex_init(&mdsc->mutex);
3414 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
majianpengfb3101b2013-06-25 14:48:19 +08003415 if (mdsc->mdsmap == NULL) {
3416 kfree(mdsc);
Cheng Renquan2d06eeb2010-03-26 18:04:40 +08003417 return -ENOMEM;
majianpengfb3101b2013-06-25 14:48:19 +08003418 }
Cheng Renquan2d06eeb2010-03-26 18:04:40 +08003419
Sage Weil2f2dc052009-10-06 11:31:09 -07003420 init_completion(&mdsc->safe_umount_waiters);
Sage Weilf3c60c52010-08-11 14:51:23 -07003421 init_waitqueue_head(&mdsc->session_close_wq);
Sage Weil2f2dc052009-10-06 11:31:09 -07003422 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3423 mdsc->sessions = NULL;
Yan, Zheng86d8f672015-01-09 17:00:42 +08003424 atomic_set(&mdsc->num_sessions, 0);
Sage Weil2f2dc052009-10-06 11:31:09 -07003425 mdsc->max_sessions = 0;
3426 mdsc->stopping = 0;
Yan, Zhengaffbc192015-05-05 21:22:13 +08003427 mdsc->last_snap_seq = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07003428 init_rwsem(&mdsc->snap_rwsem);
Sage Weila105f002010-02-15 14:37:55 -08003429 mdsc->snap_realms = RB_ROOT;
Sage Weil2f2dc052009-10-06 11:31:09 -07003430 INIT_LIST_HEAD(&mdsc->snap_empty);
3431 spin_lock_init(&mdsc->snap_empty_lock);
3432 mdsc->last_tid = 0;
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +08003433 mdsc->oldest_tid = 0;
Sage Weil44ca18f2010-02-15 12:08:46 -08003434 mdsc->request_tree = RB_ROOT;
Sage Weil2f2dc052009-10-06 11:31:09 -07003435 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3436 mdsc->last_renew_caps = jiffies;
3437 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3438 spin_lock_init(&mdsc->cap_delay_lock);
3439 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3440 spin_lock_init(&mdsc->snap_flush_lock);
Yan, Zheng553adfd2015-06-09 15:48:57 +08003441 mdsc->last_cap_flush_tid = 1;
Yan, Zhenge4500b52016-07-06 11:12:56 +08003442 INIT_LIST_HEAD(&mdsc->cap_flush_list);
Sage Weil2f2dc052009-10-06 11:31:09 -07003443 INIT_LIST_HEAD(&mdsc->cap_dirty);
Sage Weildb354052011-05-24 11:46:31 -07003444 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
Sage Weil2f2dc052009-10-06 11:31:09 -07003445 mdsc->num_cap_flushing = 0;
3446 spin_lock_init(&mdsc->cap_dirty_lock);
3447 init_waitqueue_head(&mdsc->cap_flushing_wq);
3448 spin_lock_init(&mdsc->dentry_lru_lock);
3449 INIT_LIST_HEAD(&mdsc->dentry_lru);
Cheng Renquan2d06eeb2010-03-26 18:04:40 +08003450
Yehuda Sadeh37151662010-06-17 16:16:12 -07003451 ceph_caps_init(mdsc);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003452 ceph_adjust_min_caps(mdsc, fsc->min_caps);
Yehuda Sadeh37151662010-06-17 16:16:12 -07003453
Yan, Zheng10183a62015-04-27 15:33:28 +08003454 init_rwsem(&mdsc->pool_perm_rwsem);
3455 mdsc->pool_perm_tree = RB_ROOT;
3456
Sage Weil5f44f142009-11-18 14:52:18 -08003457 return 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07003458}
3459
3460/*
3461 * Wait for safe replies on open mds requests. If we time out, drop
3462 * all requests from the tree to avoid dangling dentry refs.
3463 */
3464static void wait_requests(struct ceph_mds_client *mdsc)
3465{
Ilya Dryomova319bf52015-05-15 12:02:17 +03003466 struct ceph_options *opts = mdsc->fsc->client->options;
Sage Weil2f2dc052009-10-06 11:31:09 -07003467 struct ceph_mds_request *req;
Sage Weil2f2dc052009-10-06 11:31:09 -07003468
3469 mutex_lock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08003470 if (__get_oldest_req(mdsc)) {
Sage Weil2f2dc052009-10-06 11:31:09 -07003471 mutex_unlock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08003472
Sage Weil2f2dc052009-10-06 11:31:09 -07003473 dout("wait_requests waiting for requests\n");
3474 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
Ilya Dryomova319bf52015-05-15 12:02:17 +03003475 ceph_timeout_jiffies(opts->mount_timeout));
Sage Weil2f2dc052009-10-06 11:31:09 -07003476
3477 /* tear down remaining requests */
Sage Weil44ca18f2010-02-15 12:08:46 -08003478 mutex_lock(&mdsc->mutex);
3479 while ((req = __get_oldest_req(mdsc))) {
Sage Weil2f2dc052009-10-06 11:31:09 -07003480 dout("wait_requests timed out on tid %llu\n",
3481 req->r_tid);
Sage Weil44ca18f2010-02-15 12:08:46 -08003482 __unregister_request(mdsc, req);
Sage Weil2f2dc052009-10-06 11:31:09 -07003483 }
3484 }
3485 mutex_unlock(&mdsc->mutex);
3486 dout("wait_requests done\n");
3487}
3488
3489/*
3490 * called before mount is ro, and before dentries are torn down.
3491 * (hmm, does this still race with new lookups?)
3492 */
3493void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3494{
3495 dout("pre_umount\n");
3496 mdsc->stopping = 1;
3497
3498 drop_leases(mdsc);
Sage Weilafcdaea2009-10-14 14:27:38 -07003499 ceph_flush_dirty_caps(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07003500 wait_requests(mdsc);
Sage Weil17c688c2010-06-21 16:12:26 -07003501
3502 /*
3503 * wait for reply handlers to drop their request refs and
3504 * their inode/dcache refs
3505 */
3506 ceph_msgr_flush();
Sage Weil2f2dc052009-10-06 11:31:09 -07003507}
3508
3509/*
3510 * wait for all write mds requests to flush.
3511 */
3512static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3513{
Sage Weil80fc7312010-03-16 15:28:54 -07003514 struct ceph_mds_request *req = NULL, *nextreq;
Sage Weil44ca18f2010-02-15 12:08:46 -08003515 struct rb_node *n;
Sage Weil2f2dc052009-10-06 11:31:09 -07003516
3517 mutex_lock(&mdsc->mutex);
3518 dout("wait_unsafe_requests want %lld\n", want_tid);
Sage Weil80fc7312010-03-16 15:28:54 -07003519restart:
Sage Weil44ca18f2010-02-15 12:08:46 -08003520 req = __get_oldest_req(mdsc);
3521 while (req && req->r_tid <= want_tid) {
Sage Weil80fc7312010-03-16 15:28:54 -07003522 /* find next request */
3523 n = rb_next(&req->r_node);
3524 if (n)
3525 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3526 else
3527 nextreq = NULL;
Yan, Zhenge8a7b8b2015-05-19 18:54:40 +08003528 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3529 (req->r_op & CEPH_MDS_OP_WRITE)) {
Sage Weil44ca18f2010-02-15 12:08:46 -08003530 /* write op */
3531 ceph_mdsc_get_request(req);
Sage Weil80fc7312010-03-16 15:28:54 -07003532 if (nextreq)
3533 ceph_mdsc_get_request(nextreq);
Sage Weil44ca18f2010-02-15 12:08:46 -08003534 mutex_unlock(&mdsc->mutex);
3535 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3536 req->r_tid, want_tid);
3537 wait_for_completion(&req->r_safe_completion);
3538 mutex_lock(&mdsc->mutex);
Sage Weil44ca18f2010-02-15 12:08:46 -08003539 ceph_mdsc_put_request(req);
Sage Weil80fc7312010-03-16 15:28:54 -07003540 if (!nextreq)
3541 break; /* next dne before, so we're done! */
3542 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3543 /* next request was removed from tree */
3544 ceph_mdsc_put_request(nextreq);
3545 goto restart;
3546 }
3547 ceph_mdsc_put_request(nextreq); /* won't go away */
Sage Weil44ca18f2010-02-15 12:08:46 -08003548 }
Sage Weil80fc7312010-03-16 15:28:54 -07003549 req = nextreq;
Sage Weil2f2dc052009-10-06 11:31:09 -07003550 }
3551 mutex_unlock(&mdsc->mutex);
3552 dout("wait_unsafe_requests done\n");
3553}
3554
3555void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3556{
Yan, Zheng0e294382016-07-04 18:06:41 +08003557 u64 want_tid, want_flush;
Sage Weil2f2dc052009-10-06 11:31:09 -07003558
Yan, Zheng48fec5d2015-07-01 16:27:46 +08003559 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
Sage Weil56b7cf92010-05-03 15:22:00 -07003560 return;
3561
Sage Weil2f2dc052009-10-06 11:31:09 -07003562 dout("sync\n");
3563 mutex_lock(&mdsc->mutex);
3564 want_tid = mdsc->last_tid;
Sage Weil2f2dc052009-10-06 11:31:09 -07003565 mutex_unlock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07003566
Sage Weilafcdaea2009-10-14 14:27:38 -07003567 ceph_flush_dirty_caps(mdsc);
Yan, Zhengd3383a82015-01-08 21:30:12 +08003568 spin_lock(&mdsc->cap_dirty_lock);
Yan, Zheng8310b082015-06-09 17:20:12 +08003569 want_flush = mdsc->last_cap_flush_tid;
Yan, Zhengc8799fc2016-07-07 15:22:38 +08003570 if (!list_empty(&mdsc->cap_flush_list)) {
3571 struct ceph_cap_flush *cf =
3572 list_last_entry(&mdsc->cap_flush_list,
3573 struct ceph_cap_flush, g_list);
3574 cf->wake = true;
3575 }
Yan, Zhengd3383a82015-01-08 21:30:12 +08003576 spin_unlock(&mdsc->cap_dirty_lock);
3577
Yan, Zheng0e294382016-07-04 18:06:41 +08003578 dout("sync want tid %lld flush_seq %lld\n",
3579 want_tid, want_flush);
Sage Weil2f2dc052009-10-06 11:31:09 -07003580
3581 wait_unsafe_requests(mdsc, want_tid);
Yan, Zheng0e294382016-07-04 18:06:41 +08003582 wait_caps_flush(mdsc, want_flush);
Sage Weil2f2dc052009-10-06 11:31:09 -07003583}
3584
Sage Weilf3c60c52010-08-11 14:51:23 -07003585/*
3586 * true if all sessions are closed, or we force unmount
3587 */
Yan, Zhengfcff4152016-09-14 16:39:51 +08003588static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
Sage Weilf3c60c52010-08-11 14:51:23 -07003589{
Yan, Zheng48fec5d2015-07-01 16:27:46 +08003590 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
Sage Weilf3c60c52010-08-11 14:51:23 -07003591 return true;
Yan, Zhengfcff4152016-09-14 16:39:51 +08003592 return atomic_read(&mdsc->num_sessions) <= skipped;
Sage Weilf3c60c52010-08-11 14:51:23 -07003593}
Sage Weil2f2dc052009-10-06 11:31:09 -07003594
3595/*
3596 * called after sb is ro.
3597 */
3598void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3599{
Ilya Dryomova319bf52015-05-15 12:02:17 +03003600 struct ceph_options *opts = mdsc->fsc->client->options;
Sage Weil2f2dc052009-10-06 11:31:09 -07003601 struct ceph_mds_session *session;
3602 int i;
Yan, Zhengfcff4152016-09-14 16:39:51 +08003603 int skipped = 0;
Sage Weil2f2dc052009-10-06 11:31:09 -07003604
3605 dout("close_sessions\n");
3606
Sage Weil2f2dc052009-10-06 11:31:09 -07003607 /* close sessions */
Sage Weilf3c60c52010-08-11 14:51:23 -07003608 mutex_lock(&mdsc->mutex);
3609 for (i = 0; i < mdsc->max_sessions; i++) {
3610 session = __ceph_lookup_mds_session(mdsc, i);
3611 if (!session)
3612 continue;
Sage Weil2f2dc052009-10-06 11:31:09 -07003613 mutex_unlock(&mdsc->mutex);
Sage Weilf3c60c52010-08-11 14:51:23 -07003614 mutex_lock(&session->s_mutex);
Yan, Zhengfcff4152016-09-14 16:39:51 +08003615 if (__close_session(mdsc, session) <= 0)
3616 skipped++;
Sage Weilf3c60c52010-08-11 14:51:23 -07003617 mutex_unlock(&session->s_mutex);
3618 ceph_put_mds_session(session);
Sage Weil2f2dc052009-10-06 11:31:09 -07003619 mutex_lock(&mdsc->mutex);
3620 }
Sage Weilf3c60c52010-08-11 14:51:23 -07003621 mutex_unlock(&mdsc->mutex);
3622
3623 dout("waiting for sessions to close\n");
Yan, Zhengfcff4152016-09-14 16:39:51 +08003624 wait_event_timeout(mdsc->session_close_wq,
3625 done_closing_sessions(mdsc, skipped),
Ilya Dryomova319bf52015-05-15 12:02:17 +03003626 ceph_timeout_jiffies(opts->mount_timeout));
Sage Weil2f2dc052009-10-06 11:31:09 -07003627
3628 /* tear down remaining sessions */
Sage Weilf3c60c52010-08-11 14:51:23 -07003629 mutex_lock(&mdsc->mutex);
Sage Weil2f2dc052009-10-06 11:31:09 -07003630 for (i = 0; i < mdsc->max_sessions; i++) {
3631 if (mdsc->sessions[i]) {
3632 session = get_session(mdsc->sessions[i]);
Sage Weil2600d2d2010-02-22 15:12:16 -08003633 __unregister_session(mdsc, session);
Sage Weil2f2dc052009-10-06 11:31:09 -07003634 mutex_unlock(&mdsc->mutex);
3635 mutex_lock(&session->s_mutex);
3636 remove_session_caps(session);
3637 mutex_unlock(&session->s_mutex);
3638 ceph_put_mds_session(session);
3639 mutex_lock(&mdsc->mutex);
3640 }
3641 }
Sage Weil2f2dc052009-10-06 11:31:09 -07003642 WARN_ON(!list_empty(&mdsc->cap_delay_list));
Sage Weil2f2dc052009-10-06 11:31:09 -07003643 mutex_unlock(&mdsc->mutex);
3644
3645 ceph_cleanup_empty_realms(mdsc);
3646
3647 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3648
3649 dout("stopped\n");
3650}
3651
Yan, Zheng48fec5d2015-07-01 16:27:46 +08003652void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3653{
3654 struct ceph_mds_session *session;
3655 int mds;
3656
3657 dout("force umount\n");
3658
3659 mutex_lock(&mdsc->mutex);
3660 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3661 session = __ceph_lookup_mds_session(mdsc, mds);
3662 if (!session)
3663 continue;
3664 mutex_unlock(&mdsc->mutex);
3665 mutex_lock(&session->s_mutex);
3666 __close_session(mdsc, session);
3667 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3668 cleanup_session_requests(mdsc, session);
3669 remove_session_caps(session);
3670 }
3671 mutex_unlock(&session->s_mutex);
3672 ceph_put_mds_session(session);
3673 mutex_lock(&mdsc->mutex);
3674 kick_requests(mdsc, mds);
3675 }
3676 __wake_requests(mdsc, &mdsc->waiting_for_map);
3677 mutex_unlock(&mdsc->mutex);
3678}
3679
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003680static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
Sage Weil2f2dc052009-10-06 11:31:09 -07003681{
3682 dout("stop\n");
3683 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3684 if (mdsc->mdsmap)
3685 ceph_mdsmap_destroy(mdsc->mdsmap);
3686 kfree(mdsc->sessions);
Yehuda Sadeh37151662010-06-17 16:16:12 -07003687 ceph_caps_finalize(mdsc);
Yan, Zheng10183a62015-04-27 15:33:28 +08003688 ceph_pool_perm_destroy(mdsc);
Sage Weil2f2dc052009-10-06 11:31:09 -07003689}
3690
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003691void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3692{
3693 struct ceph_mds_client *mdsc = fsc->mdsc;
3694
Sage Weilef550f62011-03-25 13:27:48 -07003695 dout("mdsc_destroy %p\n", mdsc);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003696 ceph_mdsc_stop(mdsc);
Sage Weilef550f62011-03-25 13:27:48 -07003697
3698 /* flush out any connection work with references to us */
3699 ceph_msgr_flush();
3700
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003701 fsc->mdsc = NULL;
3702 kfree(mdsc);
Sage Weilef550f62011-03-25 13:27:48 -07003703 dout("mdsc_destroy %p done\n", mdsc);
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003704}
3705
Yan, Zheng430afba2016-07-08 11:25:38 +08003706void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3707{
3708 struct ceph_fs_client *fsc = mdsc->fsc;
3709 const char *mds_namespace = fsc->mount_options->mds_namespace;
3710 void *p = msg->front.iov_base;
3711 void *end = p + msg->front.iov_len;
3712 u32 epoch;
3713 u32 map_len;
3714 u32 num_fs;
3715 u32 mount_fscid = (u32)-1;
3716 u8 struct_v, struct_cv;
3717 int err = -EINVAL;
3718
3719 ceph_decode_need(&p, end, sizeof(u32), bad);
3720 epoch = ceph_decode_32(&p);
3721
3722 dout("handle_fsmap epoch %u\n", epoch);
3723
3724 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3725 struct_v = ceph_decode_8(&p);
3726 struct_cv = ceph_decode_8(&p);
3727 map_len = ceph_decode_32(&p);
3728
3729 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3730 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3731
3732 num_fs = ceph_decode_32(&p);
3733 while (num_fs-- > 0) {
3734 void *info_p, *info_end;
3735 u32 info_len;
3736 u8 info_v, info_cv;
3737 u32 fscid, namelen;
3738
3739 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3740 info_v = ceph_decode_8(&p);
3741 info_cv = ceph_decode_8(&p);
3742 info_len = ceph_decode_32(&p);
3743 ceph_decode_need(&p, end, info_len, bad);
3744 info_p = p;
3745 info_end = p + info_len;
3746 p = info_end;
3747
3748 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3749 fscid = ceph_decode_32(&info_p);
3750 namelen = ceph_decode_32(&info_p);
3751 ceph_decode_need(&info_p, info_end, namelen, bad);
3752
3753 if (mds_namespace &&
3754 strlen(mds_namespace) == namelen &&
3755 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3756 mount_fscid = fscid;
3757 break;
3758 }
3759 }
3760
3761 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3762 if (mount_fscid != (u32)-1) {
3763 fsc->client->monc.fs_cluster_id = mount_fscid;
3764 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3765 0, true);
3766 ceph_monc_renew_subs(&fsc->client->monc);
3767 } else {
3768 err = -ENOENT;
3769 goto err_out;
3770 }
3771 return;
3772bad:
3773 pr_err("error decoding fsmap\n");
3774err_out:
3775 mutex_lock(&mdsc->mutex);
3776 mdsc->mdsmap_err = -ENOENT;
3777 __wake_requests(mdsc, &mdsc->waiting_for_map);
3778 mutex_unlock(&mdsc->mutex);
3779 return;
3780}
Sage Weil2f2dc052009-10-06 11:31:09 -07003781
3782/*
3783 * handle mds map update.
3784 */
Yan, Zheng430afba2016-07-08 11:25:38 +08003785void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
Sage Weil2f2dc052009-10-06 11:31:09 -07003786{
3787 u32 epoch;
3788 u32 maplen;
3789 void *p = msg->front.iov_base;
3790 void *end = p + msg->front.iov_len;
3791 struct ceph_mdsmap *newmap, *oldmap;
3792 struct ceph_fsid fsid;
3793 int err = -EINVAL;
3794
3795 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3796 ceph_decode_copy(&p, &fsid, sizeof(fsid));
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003797 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
Sage Weil07433042009-11-18 16:50:41 -08003798 return;
Sage Weilc89136e2009-10-14 09:59:09 -07003799 epoch = ceph_decode_32(&p);
3800 maplen = ceph_decode_32(&p);
Sage Weil2f2dc052009-10-06 11:31:09 -07003801 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3802
3803 /* do we need it? */
Sage Weil2f2dc052009-10-06 11:31:09 -07003804 mutex_lock(&mdsc->mutex);
3805 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3806 dout("handle_map epoch %u <= our %u\n",
3807 epoch, mdsc->mdsmap->m_epoch);
3808 mutex_unlock(&mdsc->mutex);
3809 return;
3810 }
3811
3812 newmap = ceph_mdsmap_decode(&p, end);
3813 if (IS_ERR(newmap)) {
3814 err = PTR_ERR(newmap);
3815 goto bad_unlock;
3816 }
3817
3818 /* swap into place */
3819 if (mdsc->mdsmap) {
3820 oldmap = mdsc->mdsmap;
3821 mdsc->mdsmap = newmap;
3822 check_new_map(mdsc, newmap, oldmap);
3823 ceph_mdsmap_destroy(oldmap);
3824 } else {
3825 mdsc->mdsmap = newmap; /* first mds map */
3826 }
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003827 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
Sage Weil2f2dc052009-10-06 11:31:09 -07003828
3829 __wake_requests(mdsc, &mdsc->waiting_for_map);
Ilya Dryomov82dcaba2016-01-19 16:19:06 +01003830 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3831 mdsc->mdsmap->m_epoch);
Sage Weil2f2dc052009-10-06 11:31:09 -07003832
3833 mutex_unlock(&mdsc->mutex);
3834 schedule_delayed(mdsc);
3835 return;
3836
3837bad_unlock:
3838 mutex_unlock(&mdsc->mutex);
3839bad:
3840 pr_err("error decoding mdsmap %d\n", err);
3841 return;
3842}
3843
3844static struct ceph_connection *con_get(struct ceph_connection *con)
3845{
3846 struct ceph_mds_session *s = con->private;
3847
3848 if (get_session(s)) {
Sage Weil2600d2d2010-02-22 15:12:16 -08003849 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
Sage Weil2f2dc052009-10-06 11:31:09 -07003850 return con;
3851 }
3852 dout("mdsc con_get %p FAIL\n", s);
3853 return NULL;
3854}
3855
3856static void con_put(struct ceph_connection *con)
3857{
3858 struct ceph_mds_session *s = con->private;
3859
Henry C Chang7d8e18a2011-05-11 10:29:52 +00003860 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
Sage Weil2f2dc052009-10-06 11:31:09 -07003861 ceph_put_mds_session(s);
3862}
3863
3864/*
3865 * if the client is unresponsive for long enough, the mds will kill
3866 * the session entirely.
3867 */
3868static void peer_reset(struct ceph_connection *con)
3869{
3870 struct ceph_mds_session *s = con->private;
Sage Weil7e70f0e2010-03-18 13:59:12 -07003871 struct ceph_mds_client *mdsc = s->s_mdsc;
Sage Weil2f2dc052009-10-06 11:31:09 -07003872
Fabian Frederickf3ae1b92014-06-06 14:35:37 -07003873 pr_warn("mds%d closed our session\n", s->s_mds);
Sage Weil7e70f0e2010-03-18 13:59:12 -07003874 send_mds_reconnect(mdsc, s);
Sage Weil2f2dc052009-10-06 11:31:09 -07003875}
3876
3877static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3878{
3879 struct ceph_mds_session *s = con->private;
3880 struct ceph_mds_client *mdsc = s->s_mdsc;
3881 int type = le16_to_cpu(msg->hdr.type);
3882
Sage Weil2600d2d2010-02-22 15:12:16 -08003883 mutex_lock(&mdsc->mutex);
3884 if (__verify_registered_session(mdsc, s) < 0) {
3885 mutex_unlock(&mdsc->mutex);
3886 goto out;
3887 }
3888 mutex_unlock(&mdsc->mutex);
3889
Sage Weil2f2dc052009-10-06 11:31:09 -07003890 switch (type) {
3891 case CEPH_MSG_MDS_MAP:
Yan, Zheng430afba2016-07-08 11:25:38 +08003892 ceph_mdsc_handle_mdsmap(mdsc, msg);
3893 break;
3894 case CEPH_MSG_FS_MAP_USER:
3895 ceph_mdsc_handle_fsmap(mdsc, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07003896 break;
3897 case CEPH_MSG_CLIENT_SESSION:
3898 handle_session(s, msg);
3899 break;
3900 case CEPH_MSG_CLIENT_REPLY:
3901 handle_reply(s, msg);
3902 break;
3903 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
Sage Weil2600d2d2010-02-22 15:12:16 -08003904 handle_forward(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07003905 break;
3906 case CEPH_MSG_CLIENT_CAPS:
3907 ceph_handle_caps(s, msg);
3908 break;
3909 case CEPH_MSG_CLIENT_SNAP:
Sage Weil2600d2d2010-02-22 15:12:16 -08003910 ceph_handle_snap(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07003911 break;
3912 case CEPH_MSG_CLIENT_LEASE:
Sage Weil2600d2d2010-02-22 15:12:16 -08003913 handle_lease(mdsc, s, msg);
Sage Weil2f2dc052009-10-06 11:31:09 -07003914 break;
3915
3916 default:
3917 pr_err("received unknown message type %d %s\n", type,
3918 ceph_msg_type_name(type));
3919 }
Sage Weil2600d2d2010-02-22 15:12:16 -08003920out:
Sage Weil2f2dc052009-10-06 11:31:09 -07003921 ceph_msg_put(msg);
3922}
3923
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003924/*
3925 * authentication
3926 */
Alex Eldera3530df2012-05-16 15:16:39 -05003927
3928/*
3929 * Note: returned pointer is the address of a structure that's
3930 * managed separately. Caller must *not* attempt to free it.
3931 */
3932static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
Alex Elder8f43fb52012-05-16 15:16:39 -05003933 int *proto, int force_new)
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003934{
3935 struct ceph_mds_session *s = con->private;
3936 struct ceph_mds_client *mdsc = s->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003937 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
Alex Elder74f18692012-05-16 15:16:39 -05003938 struct ceph_auth_handshake *auth = &s->s_auth;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003939
Alex Elder74f18692012-05-16 15:16:39 -05003940 if (force_new && auth->authorizer) {
Ilya Dryomov6c1ea262016-04-11 19:34:49 +02003941 ceph_auth_destroy_authorizer(auth->authorizer);
Alex Elder74f18692012-05-16 15:16:39 -05003942 auth->authorizer = NULL;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003943 }
Sage Weil27859f92013-03-25 10:26:14 -07003944 if (!auth->authorizer) {
3945 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3946 auth);
Sage Weil0bed9b52013-03-25 10:26:01 -07003947 if (ret)
3948 return ERR_PTR(ret);
Sage Weil27859f92013-03-25 10:26:14 -07003949 } else {
3950 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3951 auth);
Alex Eldera2556512012-05-16 15:16:39 -05003952 if (ret)
Alex Eldera3530df2012-05-16 15:16:39 -05003953 return ERR_PTR(ret);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003954 }
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003955 *proto = ac->protocol;
Alex Elder74f18692012-05-16 15:16:39 -05003956
Alex Eldera3530df2012-05-16 15:16:39 -05003957 return auth;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003958}
3959
3960
Ilya Dryomov0dde5842016-12-02 16:35:09 +01003961static int verify_authorizer_reply(struct ceph_connection *con)
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003962{
3963 struct ceph_mds_session *s = con->private;
3964 struct ceph_mds_client *mdsc = s->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003965 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003966
Ilya Dryomov0dde5842016-12-02 16:35:09 +01003967 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
Sage Weil4e7a5dc2009-11-18 16:19:57 -08003968}
3969
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003970static int invalidate_authorizer(struct ceph_connection *con)
3971{
3972 struct ceph_mds_session *s = con->private;
3973 struct ceph_mds_client *mdsc = s->s_mdsc;
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003974 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003975
Sage Weil27859f92013-03-25 10:26:14 -07003976 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003977
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07003978 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
Sage Weil9bd2e6f2010-02-02 16:21:06 -08003979}
3980
Alex Elder53ded492013-03-01 18:00:14 -06003981static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3982 struct ceph_msg_header *hdr, int *skip)
3983{
3984 struct ceph_msg *msg;
3985 int type = (int) le16_to_cpu(hdr->type);
3986 int front_len = (int) le32_to_cpu(hdr->front_len);
3987
3988 if (con->in_msg)
3989 return con->in_msg;
3990
3991 *skip = 0;
3992 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3993 if (!msg) {
3994 pr_err("unable to allocate msg type %d len %d\n",
3995 type, front_len);
3996 return NULL;
3997 }
Alex Elder53ded492013-03-01 18:00:14 -06003998
3999 return msg;
4000}
4001
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004002static int mds_sign_message(struct ceph_msg *msg)
Yan, Zheng33d07332014-11-04 16:33:37 +08004003{
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004004 struct ceph_mds_session *s = msg->con->private;
Yan, Zheng33d07332014-11-04 16:33:37 +08004005 struct ceph_auth_handshake *auth = &s->s_auth;
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004006
Yan, Zheng33d07332014-11-04 16:33:37 +08004007 return ceph_auth_sign_message(auth, msg);
4008}
4009
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004010static int mds_check_message_signature(struct ceph_msg *msg)
Yan, Zheng33d07332014-11-04 16:33:37 +08004011{
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004012 struct ceph_mds_session *s = msg->con->private;
Yan, Zheng33d07332014-11-04 16:33:37 +08004013 struct ceph_auth_handshake *auth = &s->s_auth;
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004014
Yan, Zheng33d07332014-11-04 16:33:37 +08004015 return ceph_auth_check_message_signature(auth, msg);
4016}
4017
Tobias Klauser9e327892010-05-20 10:40:19 +02004018static const struct ceph_connection_operations mds_con_ops = {
Sage Weil2f2dc052009-10-06 11:31:09 -07004019 .get = con_get,
4020 .put = con_put,
4021 .dispatch = dispatch,
Sage Weil4e7a5dc2009-11-18 16:19:57 -08004022 .get_authorizer = get_authorizer,
4023 .verify_authorizer_reply = verify_authorizer_reply,
Sage Weil9bd2e6f2010-02-02 16:21:06 -08004024 .invalidate_authorizer = invalidate_authorizer,
Sage Weil2f2dc052009-10-06 11:31:09 -07004025 .peer_reset = peer_reset,
Alex Elder53ded492013-03-01 18:00:14 -06004026 .alloc_msg = mds_alloc_msg,
Ilya Dryomov79dbd1b2015-10-26 22:23:56 +01004027 .sign_message = mds_sign_message,
4028 .check_message_signature = mds_check_message_signature,
Sage Weil2f2dc052009-10-06 11:31:09 -07004029};
4030
Sage Weil2f2dc052009-10-06 11:31:09 -07004031/* eof */