Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1 | #include <linux/ceph/ceph_debug.h> |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2 | |
Sage Weil | 496e595 | 2010-09-22 19:57:10 -0700 | [diff] [blame] | 3 | #include <linux/fs.h> |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 4 | #include <linux/wait.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 5 | #include <linux/slab.h> |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 6 | #include <linux/sched.h> |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 7 | #include <linux/debugfs.h> |
| 8 | #include <linux/seq_file.h> |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 9 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 10 | #include "super.h" |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 11 | #include "mds_client.h" |
| 12 | |
| 13 | #include <linux/ceph/messenger.h> |
| 14 | #include <linux/ceph/decode.h> |
| 15 | #include <linux/ceph/pagelist.h> |
| 16 | #include <linux/ceph/auth.h> |
| 17 | #include <linux/ceph/debugfs.h> |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 18 | |
| 19 | /* |
| 20 | * A cluster of MDS (metadata server) daemons is responsible for |
| 21 | * managing the file system namespace (the directory hierarchy and |
| 22 | * inodes) and for coordinating shared access to storage. Metadata is |
| 23 | * partitioning hierarchically across a number of servers, and that |
| 24 | * partition varies over time as the cluster adjusts the distribution |
| 25 | * in order to balance load. |
| 26 | * |
| 27 | * The MDS client is primarily responsible to managing synchronous |
| 28 | * metadata requests for operations like open, unlink, and so forth. |
| 29 | * If there is a MDS failure, we find out about it when we (possibly |
| 30 | * request and) receive a new MDS map, and can resubmit affected |
| 31 | * requests. |
| 32 | * |
| 33 | * For the most part, though, we take advantage of a lossless |
| 34 | * communications channel to the MDS, and do not need to worry about |
| 35 | * timing out or resubmitting requests. |
| 36 | * |
| 37 | * We maintain a stateful "session" with each MDS we interact with. |
| 38 | * Within each session, we sent periodic heartbeat messages to ensure |
| 39 | * any capabilities or leases we have been issues remain valid. If |
| 40 | * the session times out and goes stale, our leases and capabilities |
| 41 | * are no longer valid. |
| 42 | */ |
| 43 | |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 44 | struct ceph_reconnect_state { |
| 45 | struct ceph_pagelist *pagelist; |
| 46 | bool flock; |
| 47 | }; |
| 48 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 49 | static void __wake_requests(struct ceph_mds_client *mdsc, |
| 50 | struct list_head *head); |
| 51 | |
Tobias Klauser | 9e32789 | 2010-05-20 10:40:19 +0200 | [diff] [blame] | 52 | static const struct ceph_connection_operations mds_con_ops; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 53 | |
| 54 | |
| 55 | /* |
| 56 | * mds reply parsing |
| 57 | */ |
| 58 | |
| 59 | /* |
| 60 | * parse individual inode info |
| 61 | */ |
| 62 | static int parse_reply_info_in(void **p, void *end, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 63 | struct ceph_mds_reply_info_in *info, |
| 64 | int features) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 65 | { |
| 66 | int err = -EIO; |
| 67 | |
| 68 | info->in = *p; |
| 69 | *p += sizeof(struct ceph_mds_reply_inode) + |
| 70 | sizeof(*info->in->fragtree.splits) * |
| 71 | le32_to_cpu(info->in->fragtree.nsplits); |
| 72 | |
| 73 | ceph_decode_32_safe(p, end, info->symlink_len, bad); |
| 74 | ceph_decode_need(p, end, info->symlink_len, bad); |
| 75 | info->symlink = *p; |
| 76 | *p += info->symlink_len; |
| 77 | |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 78 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
| 79 | ceph_decode_copy_safe(p, end, &info->dir_layout, |
| 80 | sizeof(info->dir_layout), bad); |
| 81 | else |
| 82 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); |
| 83 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 84 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
| 85 | ceph_decode_need(p, end, info->xattr_len, bad); |
| 86 | info->xattr_data = *p; |
| 87 | *p += info->xattr_len; |
| 88 | return 0; |
| 89 | bad: |
| 90 | return err; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * parse a normal reply, which may contain a (dir+)dentry and/or a |
| 95 | * target inode. |
| 96 | */ |
| 97 | static int parse_reply_info_trace(void **p, void *end, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 98 | struct ceph_mds_reply_info_parsed *info, |
| 99 | int features) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 100 | { |
| 101 | int err; |
| 102 | |
| 103 | if (info->head->is_dentry) { |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 104 | err = parse_reply_info_in(p, end, &info->diri, features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 105 | if (err < 0) |
| 106 | goto out_bad; |
| 107 | |
| 108 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) |
| 109 | goto bad; |
| 110 | info->dirfrag = *p; |
| 111 | *p += sizeof(*info->dirfrag) + |
| 112 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); |
| 113 | if (unlikely(*p > end)) |
| 114 | goto bad; |
| 115 | |
| 116 | ceph_decode_32_safe(p, end, info->dname_len, bad); |
| 117 | ceph_decode_need(p, end, info->dname_len, bad); |
| 118 | info->dname = *p; |
| 119 | *p += info->dname_len; |
| 120 | info->dlease = *p; |
| 121 | *p += sizeof(*info->dlease); |
| 122 | } |
| 123 | |
| 124 | if (info->head->is_target) { |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 125 | err = parse_reply_info_in(p, end, &info->targeti, features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 126 | if (err < 0) |
| 127 | goto out_bad; |
| 128 | } |
| 129 | |
| 130 | if (unlikely(*p != end)) |
| 131 | goto bad; |
| 132 | return 0; |
| 133 | |
| 134 | bad: |
| 135 | err = -EIO; |
| 136 | out_bad: |
| 137 | pr_err("problem parsing mds trace %d\n", err); |
| 138 | return err; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * parse readdir results |
| 143 | */ |
| 144 | static int parse_reply_info_dir(void **p, void *end, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 145 | struct ceph_mds_reply_info_parsed *info, |
| 146 | int features) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 147 | { |
| 148 | u32 num, i = 0; |
| 149 | int err; |
| 150 | |
| 151 | info->dir_dir = *p; |
| 152 | if (*p + sizeof(*info->dir_dir) > end) |
| 153 | goto bad; |
| 154 | *p += sizeof(*info->dir_dir) + |
| 155 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); |
| 156 | if (*p > end) |
| 157 | goto bad; |
| 158 | |
| 159 | ceph_decode_need(p, end, sizeof(num) + 2, bad); |
Sage Weil | c89136e | 2009-10-14 09:59:09 -0700 | [diff] [blame] | 160 | num = ceph_decode_32(p); |
| 161 | info->dir_end = ceph_decode_8(p); |
| 162 | info->dir_complete = ceph_decode_8(p); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 163 | if (num == 0) |
| 164 | goto done; |
| 165 | |
| 166 | /* alloc large array */ |
| 167 | info->dir_nr = num; |
| 168 | info->dir_in = kcalloc(num, sizeof(*info->dir_in) + |
| 169 | sizeof(*info->dir_dname) + |
| 170 | sizeof(*info->dir_dname_len) + |
| 171 | sizeof(*info->dir_dlease), |
| 172 | GFP_NOFS); |
| 173 | if (info->dir_in == NULL) { |
| 174 | err = -ENOMEM; |
| 175 | goto out_bad; |
| 176 | } |
| 177 | info->dir_dname = (void *)(info->dir_in + num); |
| 178 | info->dir_dname_len = (void *)(info->dir_dname + num); |
| 179 | info->dir_dlease = (void *)(info->dir_dname_len + num); |
| 180 | |
| 181 | while (num) { |
| 182 | /* dentry */ |
| 183 | ceph_decode_need(p, end, sizeof(u32)*2, bad); |
Sage Weil | c89136e | 2009-10-14 09:59:09 -0700 | [diff] [blame] | 184 | info->dir_dname_len[i] = ceph_decode_32(p); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 185 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
| 186 | info->dir_dname[i] = *p; |
| 187 | *p += info->dir_dname_len[i]; |
| 188 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], |
| 189 | info->dir_dname[i]); |
| 190 | info->dir_dlease[i] = *p; |
| 191 | *p += sizeof(struct ceph_mds_reply_lease); |
| 192 | |
| 193 | /* inode */ |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 194 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 195 | if (err < 0) |
| 196 | goto out_bad; |
| 197 | i++; |
| 198 | num--; |
| 199 | } |
| 200 | |
| 201 | done: |
| 202 | if (*p != end) |
| 203 | goto bad; |
| 204 | return 0; |
| 205 | |
| 206 | bad: |
| 207 | err = -EIO; |
| 208 | out_bad: |
| 209 | pr_err("problem parsing dir contents %d\n", err); |
| 210 | return err; |
| 211 | } |
| 212 | |
| 213 | /* |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 214 | * parse fcntl F_GETLK results |
| 215 | */ |
| 216 | static int parse_reply_info_filelock(void **p, void *end, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 217 | struct ceph_mds_reply_info_parsed *info, |
| 218 | int features) |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 219 | { |
| 220 | if (*p + sizeof(*info->filelock_reply) > end) |
| 221 | goto bad; |
| 222 | |
| 223 | info->filelock_reply = *p; |
| 224 | *p += sizeof(*info->filelock_reply); |
| 225 | |
| 226 | if (unlikely(*p != end)) |
| 227 | goto bad; |
| 228 | return 0; |
| 229 | |
| 230 | bad: |
| 231 | return -EIO; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * parse extra results |
| 236 | */ |
| 237 | static int parse_reply_info_extra(void **p, void *end, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 238 | struct ceph_mds_reply_info_parsed *info, |
| 239 | int features) |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 240 | { |
| 241 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 242 | return parse_reply_info_filelock(p, end, info, features); |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 243 | else |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 244 | return parse_reply_info_dir(p, end, info, features); |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | /* |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 248 | * parse entire mds reply |
| 249 | */ |
| 250 | static int parse_reply_info(struct ceph_msg *msg, |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 251 | struct ceph_mds_reply_info_parsed *info, |
| 252 | int features) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 253 | { |
| 254 | void *p, *end; |
| 255 | u32 len; |
| 256 | int err; |
| 257 | |
| 258 | info->head = msg->front.iov_base; |
| 259 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); |
| 260 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); |
| 261 | |
| 262 | /* trace */ |
| 263 | ceph_decode_32_safe(&p, end, len, bad); |
| 264 | if (len > 0) { |
Xi Wang | 32852a8 | 2012-01-14 22:20:59 -0500 | [diff] [blame] | 265 | ceph_decode_need(&p, end, len, bad); |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 266 | err = parse_reply_info_trace(&p, p+len, info, features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 267 | if (err < 0) |
| 268 | goto out_bad; |
| 269 | } |
| 270 | |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 271 | /* extra */ |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 272 | ceph_decode_32_safe(&p, end, len, bad); |
| 273 | if (len > 0) { |
Xi Wang | 32852a8 | 2012-01-14 22:20:59 -0500 | [diff] [blame] | 274 | ceph_decode_need(&p, end, len, bad); |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 275 | err = parse_reply_info_extra(&p, p+len, info, features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 276 | if (err < 0) |
| 277 | goto out_bad; |
| 278 | } |
| 279 | |
| 280 | /* snap blob */ |
| 281 | ceph_decode_32_safe(&p, end, len, bad); |
| 282 | info->snapblob_len = len; |
| 283 | info->snapblob = p; |
| 284 | p += len; |
| 285 | |
| 286 | if (p != end) |
| 287 | goto bad; |
| 288 | return 0; |
| 289 | |
| 290 | bad: |
| 291 | err = -EIO; |
| 292 | out_bad: |
| 293 | pr_err("mds parse_reply err %d\n", err); |
| 294 | return err; |
| 295 | } |
| 296 | |
| 297 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) |
| 298 | { |
| 299 | kfree(info->dir_in); |
| 300 | } |
| 301 | |
| 302 | |
| 303 | /* |
| 304 | * sessions |
| 305 | */ |
| 306 | static const char *session_state_name(int s) |
| 307 | { |
| 308 | switch (s) { |
| 309 | case CEPH_MDS_SESSION_NEW: return "new"; |
| 310 | case CEPH_MDS_SESSION_OPENING: return "opening"; |
| 311 | case CEPH_MDS_SESSION_OPEN: return "open"; |
| 312 | case CEPH_MDS_SESSION_HUNG: return "hung"; |
| 313 | case CEPH_MDS_SESSION_CLOSING: return "closing"; |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 314 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 315 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
| 316 | default: return "???"; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) |
| 321 | { |
| 322 | if (atomic_inc_not_zero(&s->s_ref)) { |
| 323 | dout("mdsc get_session %p %d -> %d\n", s, |
| 324 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); |
| 325 | return s; |
| 326 | } else { |
| 327 | dout("mdsc get_session %p 0 -- FAIL", s); |
| 328 | return NULL; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | void ceph_put_mds_session(struct ceph_mds_session *s) |
| 333 | { |
| 334 | dout("mdsc put_session %p %d -> %d\n", s, |
| 335 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 336 | if (atomic_dec_and_test(&s->s_ref)) { |
| 337 | if (s->s_authorizer) |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 338 | s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer( |
| 339 | s->s_mdsc->fsc->client->monc.auth, |
| 340 | s->s_authorizer); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 341 | kfree(s); |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 342 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 343 | } |
| 344 | |
| 345 | /* |
| 346 | * called under mdsc->mutex |
| 347 | */ |
| 348 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, |
| 349 | int mds) |
| 350 | { |
| 351 | struct ceph_mds_session *session; |
| 352 | |
| 353 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) |
| 354 | return NULL; |
| 355 | session = mdsc->sessions[mds]; |
| 356 | dout("lookup_mds_session %p %d\n", session, |
| 357 | atomic_read(&session->s_ref)); |
| 358 | get_session(session); |
| 359 | return session; |
| 360 | } |
| 361 | |
| 362 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) |
| 363 | { |
| 364 | if (mds >= mdsc->max_sessions) |
| 365 | return false; |
| 366 | return mdsc->sessions[mds]; |
| 367 | } |
| 368 | |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 369 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
| 370 | struct ceph_mds_session *s) |
| 371 | { |
| 372 | if (s->s_mds >= mdsc->max_sessions || |
| 373 | mdsc->sessions[s->s_mds] != s) |
| 374 | return -ENOENT; |
| 375 | return 0; |
| 376 | } |
| 377 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 378 | /* |
| 379 | * create+register a new session for given mds. |
| 380 | * called under mdsc->mutex. |
| 381 | */ |
| 382 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, |
| 383 | int mds) |
| 384 | { |
| 385 | struct ceph_mds_session *s; |
| 386 | |
| 387 | s = kzalloc(sizeof(*s), GFP_NOFS); |
Dan Carpenter | 4736b00 | 2010-03-20 15:30:16 +0300 | [diff] [blame] | 388 | if (!s) |
| 389 | return ERR_PTR(-ENOMEM); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 390 | s->s_mdsc = mdsc; |
| 391 | s->s_mds = mds; |
| 392 | s->s_state = CEPH_MDS_SESSION_NEW; |
| 393 | s->s_ttl = 0; |
| 394 | s->s_seq = 0; |
| 395 | mutex_init(&s->s_mutex); |
| 396 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 397 | ceph_con_init(mdsc->fsc->client->msgr, &s->s_con); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 398 | s->s_con.private = s; |
| 399 | s->s_con.ops = &mds_con_ops; |
| 400 | s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS; |
| 401 | s->s_con.peer_name.num = cpu_to_le64(mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 402 | |
Alex Elder | d8fb02a | 2012-01-12 17:48:10 -0800 | [diff] [blame] | 403 | spin_lock_init(&s->s_gen_ttl_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 404 | s->s_cap_gen = 0; |
Alex Elder | 1ce208a | 2012-01-12 17:48:11 -0800 | [diff] [blame] | 405 | s->s_cap_ttl = jiffies - 1; |
Alex Elder | d8fb02a | 2012-01-12 17:48:10 -0800 | [diff] [blame] | 406 | |
| 407 | spin_lock_init(&s->s_cap_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 408 | s->s_renew_requested = 0; |
| 409 | s->s_renew_seq = 0; |
| 410 | INIT_LIST_HEAD(&s->s_caps); |
| 411 | s->s_nr_caps = 0; |
Sage Weil | 5dacf09 | 2009-12-21 20:40:34 -0800 | [diff] [blame] | 412 | s->s_trim_caps = 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 413 | atomic_set(&s->s_ref, 1); |
| 414 | INIT_LIST_HEAD(&s->s_waiting); |
| 415 | INIT_LIST_HEAD(&s->s_unsafe); |
| 416 | s->s_num_cap_releases = 0; |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 417 | s->s_cap_iterator = NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 418 | INIT_LIST_HEAD(&s->s_cap_releases); |
| 419 | INIT_LIST_HEAD(&s->s_cap_releases_done); |
| 420 | INIT_LIST_HEAD(&s->s_cap_flushing); |
| 421 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); |
| 422 | |
| 423 | dout("register_session mds%d\n", mds); |
| 424 | if (mds >= mdsc->max_sessions) { |
| 425 | int newmax = 1 << get_count_order(mds+1); |
| 426 | struct ceph_mds_session **sa; |
| 427 | |
| 428 | dout("register_session realloc to %d\n", newmax); |
| 429 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); |
| 430 | if (sa == NULL) |
Sage Weil | 42ce56e | 2009-11-18 11:22:36 -0800 | [diff] [blame] | 431 | goto fail_realloc; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 432 | if (mdsc->sessions) { |
| 433 | memcpy(sa, mdsc->sessions, |
| 434 | mdsc->max_sessions * sizeof(void *)); |
| 435 | kfree(mdsc->sessions); |
| 436 | } |
| 437 | mdsc->sessions = sa; |
| 438 | mdsc->max_sessions = newmax; |
| 439 | } |
| 440 | mdsc->sessions[mds] = s; |
| 441 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ |
Sage Weil | 42ce56e | 2009-11-18 11:22:36 -0800 | [diff] [blame] | 442 | |
| 443 | ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); |
| 444 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 445 | return s; |
Sage Weil | 42ce56e | 2009-11-18 11:22:36 -0800 | [diff] [blame] | 446 | |
| 447 | fail_realloc: |
| 448 | kfree(s); |
| 449 | return ERR_PTR(-ENOMEM); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /* |
| 453 | * called under mdsc->mutex |
| 454 | */ |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 455 | static void __unregister_session(struct ceph_mds_client *mdsc, |
Sage Weil | 42ce56e | 2009-11-18 11:22:36 -0800 | [diff] [blame] | 456 | struct ceph_mds_session *s) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 457 | { |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 458 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
| 459 | BUG_ON(mdsc->sessions[s->s_mds] != s); |
Sage Weil | 42ce56e | 2009-11-18 11:22:36 -0800 | [diff] [blame] | 460 | mdsc->sessions[s->s_mds] = NULL; |
| 461 | ceph_con_close(&s->s_con); |
| 462 | ceph_put_mds_session(s); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* |
| 466 | * drop session refs in request. |
| 467 | * |
| 468 | * should be last request ref, or hold mdsc->mutex |
| 469 | */ |
| 470 | static void put_request_session(struct ceph_mds_request *req) |
| 471 | { |
| 472 | if (req->r_session) { |
| 473 | ceph_put_mds_session(req->r_session); |
| 474 | req->r_session = NULL; |
| 475 | } |
| 476 | } |
| 477 | |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 478 | void ceph_mdsc_release_request(struct kref *kref) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 479 | { |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 480 | struct ceph_mds_request *req = container_of(kref, |
| 481 | struct ceph_mds_request, |
| 482 | r_kref); |
| 483 | if (req->r_request) |
| 484 | ceph_msg_put(req->r_request); |
| 485 | if (req->r_reply) { |
| 486 | ceph_msg_put(req->r_reply); |
| 487 | destroy_reply_info(&req->r_reply_info); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 488 | } |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 489 | if (req->r_inode) { |
Sage Weil | 41b02e1 | 2011-07-26 11:31:14 -0700 | [diff] [blame] | 490 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 491 | iput(req->r_inode); |
| 492 | } |
| 493 | if (req->r_locked_dir) |
Sage Weil | 41b02e1 | 2011-07-26 11:31:14 -0700 | [diff] [blame] | 494 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 495 | if (req->r_target_inode) |
| 496 | iput(req->r_target_inode); |
| 497 | if (req->r_dentry) |
| 498 | dput(req->r_dentry); |
| 499 | if (req->r_old_dentry) { |
Sage Weil | 41b02e1 | 2011-07-26 11:31:14 -0700 | [diff] [blame] | 500 | /* |
| 501 | * track (and drop pins for) r_old_dentry_dir |
| 502 | * separately, since r_old_dentry's d_parent may have |
| 503 | * changed between the dir mutex being dropped and |
| 504 | * this request being freed. |
| 505 | */ |
| 506 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), |
| 507 | CEPH_CAP_PIN); |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 508 | dput(req->r_old_dentry); |
Sage Weil | 41b02e1 | 2011-07-26 11:31:14 -0700 | [diff] [blame] | 509 | iput(req->r_old_dentry_dir); |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 510 | } |
| 511 | kfree(req->r_path1); |
| 512 | kfree(req->r_path2); |
| 513 | put_request_session(req); |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 514 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 515 | kfree(req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | /* |
| 519 | * lookup session, bump ref if found. |
| 520 | * |
| 521 | * called under mdsc->mutex. |
| 522 | */ |
| 523 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, |
| 524 | u64 tid) |
| 525 | { |
| 526 | struct ceph_mds_request *req; |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 527 | struct rb_node *n = mdsc->request_tree.rb_node; |
| 528 | |
| 529 | while (n) { |
| 530 | req = rb_entry(n, struct ceph_mds_request, r_node); |
| 531 | if (tid < req->r_tid) |
| 532 | n = n->rb_left; |
| 533 | else if (tid > req->r_tid) |
| 534 | n = n->rb_right; |
| 535 | else { |
| 536 | ceph_mdsc_get_request(req); |
| 537 | return req; |
| 538 | } |
| 539 | } |
| 540 | return NULL; |
| 541 | } |
| 542 | |
| 543 | static void __insert_request(struct ceph_mds_client *mdsc, |
| 544 | struct ceph_mds_request *new) |
| 545 | { |
| 546 | struct rb_node **p = &mdsc->request_tree.rb_node; |
| 547 | struct rb_node *parent = NULL; |
| 548 | struct ceph_mds_request *req = NULL; |
| 549 | |
| 550 | while (*p) { |
| 551 | parent = *p; |
| 552 | req = rb_entry(parent, struct ceph_mds_request, r_node); |
| 553 | if (new->r_tid < req->r_tid) |
| 554 | p = &(*p)->rb_left; |
| 555 | else if (new->r_tid > req->r_tid) |
| 556 | p = &(*p)->rb_right; |
| 557 | else |
| 558 | BUG(); |
| 559 | } |
| 560 | |
| 561 | rb_link_node(&new->r_node, parent, p); |
| 562 | rb_insert_color(&new->r_node, &mdsc->request_tree); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | /* |
| 566 | * Register an in-flight request, and assign a tid. Link to directory |
| 567 | * are modifying (if any). |
| 568 | * |
| 569 | * Called under mdsc->mutex. |
| 570 | */ |
| 571 | static void __register_request(struct ceph_mds_client *mdsc, |
| 572 | struct ceph_mds_request *req, |
| 573 | struct inode *dir) |
| 574 | { |
| 575 | req->r_tid = ++mdsc->last_tid; |
| 576 | if (req->r_num_caps) |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 577 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
| 578 | req->r_num_caps); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 579 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
| 580 | ceph_mdsc_get_request(req); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 581 | __insert_request(mdsc, req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 582 | |
Sage Weil | cb4276c | 2010-11-08 07:28:52 -0800 | [diff] [blame] | 583 | req->r_uid = current_fsuid(); |
| 584 | req->r_gid = current_fsgid(); |
| 585 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 586 | if (dir) { |
| 587 | struct ceph_inode_info *ci = ceph_inode(dir); |
| 588 | |
Sage Weil | 3b66378 | 2011-05-18 16:12:12 -0700 | [diff] [blame] | 589 | ihold(dir); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 590 | spin_lock(&ci->i_unsafe_lock); |
| 591 | req->r_unsafe_dir = dir; |
| 592 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); |
| 593 | spin_unlock(&ci->i_unsafe_lock); |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | static void __unregister_request(struct ceph_mds_client *mdsc, |
| 598 | struct ceph_mds_request *req) |
| 599 | { |
| 600 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 601 | rb_erase(&req->r_node, &mdsc->request_tree); |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 602 | RB_CLEAR_NODE(&req->r_node); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 603 | |
| 604 | if (req->r_unsafe_dir) { |
| 605 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); |
| 606 | |
| 607 | spin_lock(&ci->i_unsafe_lock); |
| 608 | list_del_init(&req->r_unsafe_dir_item); |
| 609 | spin_unlock(&ci->i_unsafe_lock); |
Sage Weil | 3b66378 | 2011-05-18 16:12:12 -0700 | [diff] [blame] | 610 | |
| 611 | iput(req->r_unsafe_dir); |
| 612 | req->r_unsafe_dir = NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 613 | } |
Sage Weil | 94aa8ae | 2010-03-28 21:22:50 -0700 | [diff] [blame] | 614 | |
| 615 | ceph_mdsc_put_request(req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Choose mds to send request to next. If there is a hint set in the |
| 620 | * request (e.g., due to a prior forward hint from the mds), use that. |
| 621 | * Otherwise, consult frag tree and/or caps to identify the |
| 622 | * appropriate mds. If all else fails, choose randomly. |
| 623 | * |
| 624 | * Called under mdsc->mutex. |
| 625 | */ |
H Hartley Sweeten | 7fd7d10 | 2011-09-23 13:22:11 -0700 | [diff] [blame] | 626 | static struct dentry *get_nonsnap_parent(struct dentry *dentry) |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 627 | { |
Sage Weil | d79698d | 2011-07-26 11:31:26 -0700 | [diff] [blame] | 628 | /* |
| 629 | * we don't need to worry about protecting the d_parent access |
| 630 | * here because we never renaming inside the snapped namespace |
| 631 | * except to resplice to another snapdir, and either the old or new |
| 632 | * result is a valid result. |
| 633 | */ |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 634 | while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) |
| 635 | dentry = dentry->d_parent; |
| 636 | return dentry; |
| 637 | } |
| 638 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 639 | static int __choose_mds(struct ceph_mds_client *mdsc, |
| 640 | struct ceph_mds_request *req) |
| 641 | { |
| 642 | struct inode *inode; |
| 643 | struct ceph_inode_info *ci; |
| 644 | struct ceph_cap *cap; |
| 645 | int mode = req->r_direct_mode; |
| 646 | int mds = -1; |
| 647 | u32 hash = req->r_direct_hash; |
| 648 | bool is_hash = req->r_direct_is_hash; |
| 649 | |
| 650 | /* |
| 651 | * is there a specific mds we should try? ignore hint if we have |
| 652 | * no session and the mds is not up (active or recovering). |
| 653 | */ |
| 654 | if (req->r_resend_mds >= 0 && |
| 655 | (__have_session(mdsc, req->r_resend_mds) || |
| 656 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { |
| 657 | dout("choose_mds using resend_mds mds%d\n", |
| 658 | req->r_resend_mds); |
| 659 | return req->r_resend_mds; |
| 660 | } |
| 661 | |
| 662 | if (mode == USE_RANDOM_MDS) |
| 663 | goto random; |
| 664 | |
| 665 | inode = NULL; |
| 666 | if (req->r_inode) { |
| 667 | inode = req->r_inode; |
| 668 | } else if (req->r_dentry) { |
Sage Weil | d79698d | 2011-07-26 11:31:26 -0700 | [diff] [blame] | 669 | /* ignore race with rename; old or new d_parent is okay */ |
| 670 | struct dentry *parent = req->r_dentry->d_parent; |
| 671 | struct inode *dir = parent->d_inode; |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 672 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 673 | if (dir->i_sb != mdsc->fsc->sb) { |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 674 | /* not this fs! */ |
| 675 | inode = req->r_dentry->d_inode; |
| 676 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { |
| 677 | /* direct snapped/virtual snapdir requests |
| 678 | * based on parent dir inode */ |
Sage Weil | d79698d | 2011-07-26 11:31:26 -0700 | [diff] [blame] | 679 | struct dentry *dn = get_nonsnap_parent(parent); |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 680 | inode = dn->d_inode; |
| 681 | dout("__choose_mds using nonsnap parent %p\n", inode); |
| 682 | } else if (req->r_dentry->d_inode) { |
| 683 | /* dentry target */ |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 684 | inode = req->r_dentry->d_inode; |
| 685 | } else { |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 686 | /* dir + name */ |
| 687 | inode = dir; |
Sage Weil | e5f86dc | 2011-07-26 11:30:55 -0700 | [diff] [blame] | 688 | hash = ceph_dentry_hash(dir, req->r_dentry); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 689 | is_hash = true; |
| 690 | } |
| 691 | } |
Sage Weil | eb6bb1c | 2010-08-16 09:21:27 -0700 | [diff] [blame] | 692 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 693 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
| 694 | (int)hash, mode); |
| 695 | if (!inode) |
| 696 | goto random; |
| 697 | ci = ceph_inode(inode); |
| 698 | |
| 699 | if (is_hash && S_ISDIR(inode->i_mode)) { |
| 700 | struct ceph_inode_frag frag; |
| 701 | int found; |
| 702 | |
| 703 | ceph_choose_frag(ci, hash, &frag, &found); |
| 704 | if (found) { |
| 705 | if (mode == USE_ANY_MDS && frag.ndist > 0) { |
| 706 | u8 r; |
| 707 | |
| 708 | /* choose a random replica */ |
| 709 | get_random_bytes(&r, 1); |
| 710 | r %= frag.ndist; |
| 711 | mds = frag.dist[r]; |
| 712 | dout("choose_mds %p %llx.%llx " |
| 713 | "frag %u mds%d (%d/%d)\n", |
| 714 | inode, ceph_vinop(inode), |
Sage Weil | d66bbd4 | 2011-01-21 21:16:46 -0800 | [diff] [blame] | 715 | frag.frag, mds, |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 716 | (int)r, frag.ndist); |
Sage Weil | d66bbd4 | 2011-01-21 21:16:46 -0800 | [diff] [blame] | 717 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
| 718 | CEPH_MDS_STATE_ACTIVE) |
| 719 | return mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 720 | } |
| 721 | |
| 722 | /* since this file/dir wasn't known to be |
| 723 | * replicated, then we want to look for the |
| 724 | * authoritative mds. */ |
| 725 | mode = USE_AUTH_MDS; |
| 726 | if (frag.mds >= 0) { |
| 727 | /* choose auth mds */ |
| 728 | mds = frag.mds; |
| 729 | dout("choose_mds %p %llx.%llx " |
| 730 | "frag %u mds%d (auth)\n", |
| 731 | inode, ceph_vinop(inode), frag.frag, mds); |
Sage Weil | d66bbd4 | 2011-01-21 21:16:46 -0800 | [diff] [blame] | 732 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
| 733 | CEPH_MDS_STATE_ACTIVE) |
| 734 | return mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 735 | } |
| 736 | } |
| 737 | } |
| 738 | |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 739 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 740 | cap = NULL; |
| 741 | if (mode == USE_AUTH_MDS) |
| 742 | cap = ci->i_auth_cap; |
| 743 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) |
| 744 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); |
| 745 | if (!cap) { |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 746 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 747 | goto random; |
| 748 | } |
| 749 | mds = cap->session->s_mds; |
| 750 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", |
| 751 | inode, ceph_vinop(inode), mds, |
| 752 | cap == ci->i_auth_cap ? "auth " : "", cap); |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 753 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 754 | return mds; |
| 755 | |
| 756 | random: |
| 757 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); |
| 758 | dout("choose_mds chose random mds%d\n", mds); |
| 759 | return mds; |
| 760 | } |
| 761 | |
| 762 | |
| 763 | /* |
| 764 | * session messages |
| 765 | */ |
| 766 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) |
| 767 | { |
| 768 | struct ceph_msg *msg; |
| 769 | struct ceph_mds_session_head *h; |
| 770 | |
Sage Weil | b61c276 | 2011-08-09 15:03:46 -0700 | [diff] [blame] | 771 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
| 772 | false); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 773 | if (!msg) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 774 | pr_err("create_session_msg ENOMEM creating msg\n"); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 775 | return NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 776 | } |
| 777 | h = msg->front.iov_base; |
| 778 | h->op = cpu_to_le32(op); |
| 779 | h->seq = cpu_to_le64(seq); |
| 780 | return msg; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * send session open request. |
| 785 | * |
| 786 | * called under mdsc->mutex |
| 787 | */ |
| 788 | static int __open_session(struct ceph_mds_client *mdsc, |
| 789 | struct ceph_mds_session *session) |
| 790 | { |
| 791 | struct ceph_msg *msg; |
| 792 | int mstate; |
| 793 | int mds = session->s_mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 794 | |
| 795 | /* wait for mds to go active? */ |
| 796 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); |
| 797 | dout("open_session to mds%d (%s)\n", mds, |
| 798 | ceph_mds_state_name(mstate)); |
| 799 | session->s_state = CEPH_MDS_SESSION_OPENING; |
| 800 | session->s_renew_requested = jiffies; |
| 801 | |
| 802 | /* send connect message */ |
| 803 | msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 804 | if (!msg) |
| 805 | return -ENOMEM; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 806 | ceph_con_send(&session->s_con, msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | /* |
Sage Weil | ed0552a | 2010-06-21 13:38:25 -0700 | [diff] [blame] | 811 | * open sessions for any export targets for the given mds |
| 812 | * |
| 813 | * called under mdsc->mutex |
| 814 | */ |
| 815 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
| 816 | struct ceph_mds_session *session) |
| 817 | { |
| 818 | struct ceph_mds_info *mi; |
| 819 | struct ceph_mds_session *ts; |
| 820 | int i, mds = session->s_mds; |
| 821 | int target; |
| 822 | |
| 823 | if (mds >= mdsc->mdsmap->m_max_mds) |
| 824 | return; |
| 825 | mi = &mdsc->mdsmap->m_info[mds]; |
| 826 | dout("open_export_target_sessions for mds%d (%d targets)\n", |
| 827 | session->s_mds, mi->num_export_targets); |
| 828 | |
| 829 | for (i = 0; i < mi->num_export_targets; i++) { |
| 830 | target = mi->export_targets[i]; |
| 831 | ts = __ceph_lookup_mds_session(mdsc, target); |
| 832 | if (!ts) { |
| 833 | ts = register_session(mdsc, target); |
| 834 | if (IS_ERR(ts)) |
| 835 | return; |
| 836 | } |
| 837 | if (session->s_state == CEPH_MDS_SESSION_NEW || |
| 838 | session->s_state == CEPH_MDS_SESSION_CLOSING) |
| 839 | __open_session(mdsc, session); |
| 840 | else |
| 841 | dout(" mds%d target mds%d %p is %s\n", session->s_mds, |
| 842 | i, ts, session_state_name(ts->s_state)); |
| 843 | ceph_put_mds_session(ts); |
| 844 | } |
| 845 | } |
| 846 | |
Sage Weil | 154f42c | 2010-06-21 13:45:04 -0700 | [diff] [blame] | 847 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
| 848 | struct ceph_mds_session *session) |
| 849 | { |
| 850 | mutex_lock(&mdsc->mutex); |
| 851 | __open_export_target_sessions(mdsc, session); |
| 852 | mutex_unlock(&mdsc->mutex); |
| 853 | } |
| 854 | |
Sage Weil | ed0552a | 2010-06-21 13:38:25 -0700 | [diff] [blame] | 855 | /* |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 856 | * session caps |
| 857 | */ |
| 858 | |
| 859 | /* |
| 860 | * Free preallocated cap messages assigned to this session |
| 861 | */ |
| 862 | static void cleanup_cap_releases(struct ceph_mds_session *session) |
| 863 | { |
| 864 | struct ceph_msg *msg; |
| 865 | |
| 866 | spin_lock(&session->s_cap_lock); |
| 867 | while (!list_empty(&session->s_cap_releases)) { |
| 868 | msg = list_first_entry(&session->s_cap_releases, |
| 869 | struct ceph_msg, list_head); |
| 870 | list_del_init(&msg->list_head); |
| 871 | ceph_msg_put(msg); |
| 872 | } |
| 873 | while (!list_empty(&session->s_cap_releases_done)) { |
| 874 | msg = list_first_entry(&session->s_cap_releases_done, |
| 875 | struct ceph_msg, list_head); |
| 876 | list_del_init(&msg->list_head); |
| 877 | ceph_msg_put(msg); |
| 878 | } |
| 879 | spin_unlock(&session->s_cap_lock); |
| 880 | } |
| 881 | |
| 882 | /* |
Sage Weil | f818a73 | 2010-05-11 20:56:31 -0700 | [diff] [blame] | 883 | * Helper to safely iterate over all caps associated with a session, with |
| 884 | * special care taken to handle a racing __ceph_remove_cap(). |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 885 | * |
Sage Weil | f818a73 | 2010-05-11 20:56:31 -0700 | [diff] [blame] | 886 | * Caller must hold session s_mutex. |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 887 | */ |
| 888 | static int iterate_session_caps(struct ceph_mds_session *session, |
| 889 | int (*cb)(struct inode *, struct ceph_cap *, |
| 890 | void *), void *arg) |
| 891 | { |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 892 | struct list_head *p; |
| 893 | struct ceph_cap *cap; |
| 894 | struct inode *inode, *last_inode = NULL; |
| 895 | struct ceph_cap *old_cap = NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 896 | int ret; |
| 897 | |
| 898 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); |
| 899 | spin_lock(&session->s_cap_lock); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 900 | p = session->s_caps.next; |
| 901 | while (p != &session->s_caps) { |
| 902 | cap = list_entry(p, struct ceph_cap, session_caps); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 903 | inode = igrab(&cap->ci->vfs_inode); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 904 | if (!inode) { |
| 905 | p = p->next; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 906 | continue; |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 907 | } |
| 908 | session->s_cap_iterator = cap; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 909 | spin_unlock(&session->s_cap_lock); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 910 | |
| 911 | if (last_inode) { |
| 912 | iput(last_inode); |
| 913 | last_inode = NULL; |
| 914 | } |
| 915 | if (old_cap) { |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 916 | ceph_put_cap(session->s_mdsc, old_cap); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 917 | old_cap = NULL; |
| 918 | } |
| 919 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 920 | ret = cb(inode, cap, arg); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 921 | last_inode = inode; |
| 922 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 923 | spin_lock(&session->s_cap_lock); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 924 | p = p->next; |
| 925 | if (cap->ci == NULL) { |
| 926 | dout("iterate_session_caps finishing cap %p removal\n", |
| 927 | cap); |
| 928 | BUG_ON(cap->session != session); |
| 929 | list_del_init(&cap->session_caps); |
| 930 | session->s_nr_caps--; |
| 931 | cap->session = NULL; |
| 932 | old_cap = cap; /* put_cap it w/o locks held */ |
| 933 | } |
Sage Weil | 5dacf09 | 2009-12-21 20:40:34 -0800 | [diff] [blame] | 934 | if (ret < 0) |
| 935 | goto out; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 936 | } |
Sage Weil | 5dacf09 | 2009-12-21 20:40:34 -0800 | [diff] [blame] | 937 | ret = 0; |
| 938 | out: |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 939 | session->s_cap_iterator = NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 940 | spin_unlock(&session->s_cap_lock); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 941 | |
| 942 | if (last_inode) |
| 943 | iput(last_inode); |
| 944 | if (old_cap) |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 945 | ceph_put_cap(session->s_mdsc, old_cap); |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 946 | |
Sage Weil | 5dacf09 | 2009-12-21 20:40:34 -0800 | [diff] [blame] | 947 | return ret; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 951 | void *arg) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 952 | { |
| 953 | struct ceph_inode_info *ci = ceph_inode(inode); |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 954 | int drop = 0; |
| 955 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 956 | dout("removing cap %p, ci is %p, inode is %p\n", |
| 957 | cap, ci, &ci->vfs_inode); |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 958 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 959 | __ceph_remove_cap(cap); |
| 960 | if (!__ceph_is_any_real_caps(ci)) { |
| 961 | struct ceph_mds_client *mdsc = |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 962 | ceph_sb_to_client(inode->i_sb)->mdsc; |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 963 | |
| 964 | spin_lock(&mdsc->cap_dirty_lock); |
| 965 | if (!list_empty(&ci->i_dirty_item)) { |
| 966 | pr_info(" dropping dirty %s state for %p %lld\n", |
| 967 | ceph_cap_string(ci->i_dirty_caps), |
| 968 | inode, ceph_ino(inode)); |
| 969 | ci->i_dirty_caps = 0; |
| 970 | list_del_init(&ci->i_dirty_item); |
| 971 | drop = 1; |
| 972 | } |
| 973 | if (!list_empty(&ci->i_flushing_item)) { |
| 974 | pr_info(" dropping dirty+flushing %s state for %p %lld\n", |
| 975 | ceph_cap_string(ci->i_flushing_caps), |
| 976 | inode, ceph_ino(inode)); |
| 977 | ci->i_flushing_caps = 0; |
| 978 | list_del_init(&ci->i_flushing_item); |
| 979 | mdsc->num_cap_flushing--; |
| 980 | drop = 1; |
| 981 | } |
| 982 | if (drop && ci->i_wrbuffer_ref) { |
| 983 | pr_info(" dropping dirty data for %p %lld\n", |
| 984 | inode, ceph_ino(inode)); |
| 985 | ci->i_wrbuffer_ref = 0; |
| 986 | ci->i_wrbuffer_ref_head = 0; |
| 987 | drop++; |
| 988 | } |
| 989 | spin_unlock(&mdsc->cap_dirty_lock); |
| 990 | } |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 991 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 992 | while (drop--) |
| 993 | iput(inode); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 994 | return 0; |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * caller must hold session s_mutex |
| 999 | */ |
| 1000 | static void remove_session_caps(struct ceph_mds_session *session) |
| 1001 | { |
| 1002 | dout("remove_session_caps on %p\n", session); |
| 1003 | iterate_session_caps(session, remove_session_caps_cb, NULL); |
| 1004 | BUG_ON(session->s_nr_caps > 0); |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 1005 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1006 | cleanup_cap_releases(session); |
| 1007 | } |
| 1008 | |
| 1009 | /* |
| 1010 | * wake up any threads waiting on this session's caps. if the cap is |
| 1011 | * old (didn't get renewed on the client reconnect), remove it now. |
| 1012 | * |
| 1013 | * caller must hold s_mutex. |
| 1014 | */ |
| 1015 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, |
| 1016 | void *arg) |
| 1017 | { |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1018 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1019 | |
Yehuda Sadeh | 03066f2 | 2010-07-27 13:11:08 -0700 | [diff] [blame] | 1020 | wake_up_all(&ci->i_cap_wq); |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1021 | if (arg) { |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1022 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1023 | ci->i_wanted_max_size = 0; |
| 1024 | ci->i_requested_max_size = 0; |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1025 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1026 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1027 | return 0; |
| 1028 | } |
| 1029 | |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1030 | static void wake_up_session_caps(struct ceph_mds_session *session, |
| 1031 | int reconnect) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1032 | { |
| 1033 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1034 | iterate_session_caps(session, wake_up_session_cb, |
| 1035 | (void *)(unsigned long)reconnect); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * Send periodic message to MDS renewing all currently held caps. The |
| 1040 | * ack will reset the expiration for all caps from this session. |
| 1041 | * |
| 1042 | * caller holds s_mutex |
| 1043 | */ |
| 1044 | static int send_renew_caps(struct ceph_mds_client *mdsc, |
| 1045 | struct ceph_mds_session *session) |
| 1046 | { |
| 1047 | struct ceph_msg *msg; |
| 1048 | int state; |
| 1049 | |
| 1050 | if (time_after_eq(jiffies, session->s_cap_ttl) && |
| 1051 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) |
| 1052 | pr_info("mds%d caps stale\n", session->s_mds); |
Sage Weil | e4cb4cb | 2010-03-18 13:43:09 -0700 | [diff] [blame] | 1053 | session->s_renew_requested = jiffies; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1054 | |
| 1055 | /* do not try to renew caps until a recovering mds has reconnected |
| 1056 | * with its clients. */ |
| 1057 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); |
| 1058 | if (state < CEPH_MDS_STATE_RECONNECT) { |
| 1059 | dout("send_renew_caps ignoring mds%d (%s)\n", |
| 1060 | session->s_mds, ceph_mds_state_name(state)); |
| 1061 | return 0; |
| 1062 | } |
| 1063 | |
| 1064 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, |
| 1065 | ceph_mds_state_name(state)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1066 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
| 1067 | ++session->s_renew_seq); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 1068 | if (!msg) |
| 1069 | return -ENOMEM; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1070 | ceph_con_send(&session->s_con, msg); |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1076 | * |
| 1077 | * Called under session->s_mutex |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1078 | */ |
| 1079 | static void renewed_caps(struct ceph_mds_client *mdsc, |
| 1080 | struct ceph_mds_session *session, int is_renew) |
| 1081 | { |
| 1082 | int was_stale; |
| 1083 | int wake = 0; |
| 1084 | |
| 1085 | spin_lock(&session->s_cap_lock); |
Alex Elder | 1ce208a | 2012-01-12 17:48:11 -0800 | [diff] [blame] | 1086 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1087 | |
| 1088 | session->s_cap_ttl = session->s_renew_requested + |
| 1089 | mdsc->mdsmap->m_session_timeout*HZ; |
| 1090 | |
| 1091 | if (was_stale) { |
| 1092 | if (time_before(jiffies, session->s_cap_ttl)) { |
| 1093 | pr_info("mds%d caps renewed\n", session->s_mds); |
| 1094 | wake = 1; |
| 1095 | } else { |
| 1096 | pr_info("mds%d caps still stale\n", session->s_mds); |
| 1097 | } |
| 1098 | } |
| 1099 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", |
| 1100 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", |
| 1101 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); |
| 1102 | spin_unlock(&session->s_cap_lock); |
| 1103 | |
| 1104 | if (wake) |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 1105 | wake_up_session_caps(session, 0); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1106 | } |
| 1107 | |
| 1108 | /* |
| 1109 | * send a session close request |
| 1110 | */ |
| 1111 | static int request_close_session(struct ceph_mds_client *mdsc, |
| 1112 | struct ceph_mds_session *session) |
| 1113 | { |
| 1114 | struct ceph_msg *msg; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1115 | |
| 1116 | dout("request_close_session mds%d state %s seq %lld\n", |
| 1117 | session->s_mds, session_state_name(session->s_state), |
| 1118 | session->s_seq); |
| 1119 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 1120 | if (!msg) |
| 1121 | return -ENOMEM; |
| 1122 | ceph_con_send(&session->s_con, msg); |
| 1123 | return 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | /* |
| 1127 | * Called with s_mutex held. |
| 1128 | */ |
| 1129 | static int __close_session(struct ceph_mds_client *mdsc, |
| 1130 | struct ceph_mds_session *session) |
| 1131 | { |
| 1132 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) |
| 1133 | return 0; |
| 1134 | session->s_state = CEPH_MDS_SESSION_CLOSING; |
| 1135 | return request_close_session(mdsc, session); |
| 1136 | } |
| 1137 | |
| 1138 | /* |
| 1139 | * Trim old(er) caps. |
| 1140 | * |
| 1141 | * Because we can't cache an inode without one or more caps, we do |
| 1142 | * this indirectly: if a cap is unused, we prune its aliases, at which |
| 1143 | * point the inode will hopefully get dropped to. |
| 1144 | * |
| 1145 | * Yes, this is a bit sloppy. Our only real goal here is to respond to |
| 1146 | * memory pressure from the MDS, though, so it needn't be perfect. |
| 1147 | */ |
| 1148 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) |
| 1149 | { |
| 1150 | struct ceph_mds_session *session = arg; |
| 1151 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 1152 | int used, oissued, mine; |
| 1153 | |
| 1154 | if (session->s_trim_caps <= 0) |
| 1155 | return -1; |
| 1156 | |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1157 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1158 | mine = cap->issued | cap->implemented; |
| 1159 | used = __ceph_caps_used(ci); |
| 1160 | oissued = __ceph_caps_issued_other(ci, cap); |
| 1161 | |
| 1162 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n", |
| 1163 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
| 1164 | ceph_cap_string(used)); |
| 1165 | if (ci->i_dirty_caps) |
| 1166 | goto out; /* dirty caps */ |
| 1167 | if ((used & ~oissued) & mine) |
| 1168 | goto out; /* we need these caps */ |
| 1169 | |
| 1170 | session->s_trim_caps--; |
| 1171 | if (oissued) { |
| 1172 | /* we aren't the only cap.. just remove us */ |
Sage Weil | 7c1332b | 2010-02-16 11:39:45 -0800 | [diff] [blame] | 1173 | __ceph_remove_cap(cap); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1174 | } else { |
| 1175 | /* try to drop referring dentries */ |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1176 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1177 | d_prune_aliases(inode); |
| 1178 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", |
| 1179 | inode, cap, atomic_read(&inode->i_count)); |
| 1180 | return 0; |
| 1181 | } |
| 1182 | |
| 1183 | out: |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1184 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1185 | return 0; |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * Trim session cap count down to some max number. |
| 1190 | */ |
| 1191 | static int trim_caps(struct ceph_mds_client *mdsc, |
| 1192 | struct ceph_mds_session *session, |
| 1193 | int max_caps) |
| 1194 | { |
| 1195 | int trim_caps = session->s_nr_caps - max_caps; |
| 1196 | |
| 1197 | dout("trim_caps mds%d start: %d / %d, trim %d\n", |
| 1198 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); |
| 1199 | if (trim_caps > 0) { |
| 1200 | session->s_trim_caps = trim_caps; |
| 1201 | iterate_session_caps(session, trim_caps_cb, session); |
| 1202 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", |
| 1203 | session->s_mds, session->s_nr_caps, max_caps, |
| 1204 | trim_caps - session->s_trim_caps); |
Sage Weil | 5dacf09 | 2009-12-21 20:40:34 -0800 | [diff] [blame] | 1205 | session->s_trim_caps = 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1206 | } |
| 1207 | return 0; |
| 1208 | } |
| 1209 | |
| 1210 | /* |
| 1211 | * Allocate cap_release messages. If there is a partially full message |
| 1212 | * in the queue, try to allocate enough to cover it's remainder, so that |
| 1213 | * we can send it immediately. |
| 1214 | * |
| 1215 | * Called under s_mutex. |
| 1216 | */ |
Sage Weil | 2b2300d | 2010-06-09 16:52:04 -0700 | [diff] [blame] | 1217 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
Sage Weil | ee6b272 | 2010-06-10 12:55:52 -0700 | [diff] [blame] | 1218 | struct ceph_mds_session *session) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1219 | { |
Sage Weil | 38e8883 | 2010-06-10 12:57:11 -0700 | [diff] [blame] | 1220 | struct ceph_msg *msg, *partial = NULL; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1221 | struct ceph_mds_cap_release *head; |
| 1222 | int err = -ENOMEM; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 1223 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
Sage Weil | 38e8883 | 2010-06-10 12:57:11 -0700 | [diff] [blame] | 1224 | int num; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1225 | |
Sage Weil | 38e8883 | 2010-06-10 12:57:11 -0700 | [diff] [blame] | 1226 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
| 1227 | extra); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1228 | |
| 1229 | spin_lock(&session->s_cap_lock); |
| 1230 | |
| 1231 | if (!list_empty(&session->s_cap_releases)) { |
| 1232 | msg = list_first_entry(&session->s_cap_releases, |
| 1233 | struct ceph_msg, |
| 1234 | list_head); |
| 1235 | head = msg->front.iov_base; |
Sage Weil | 38e8883 | 2010-06-10 12:57:11 -0700 | [diff] [blame] | 1236 | num = le32_to_cpu(head->num); |
| 1237 | if (num) { |
| 1238 | dout(" partial %p with (%d/%d)\n", msg, num, |
| 1239 | (int)CEPH_CAPS_PER_RELEASE); |
| 1240 | extra += CEPH_CAPS_PER_RELEASE - num; |
| 1241 | partial = msg; |
| 1242 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1243 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1244 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
| 1245 | spin_unlock(&session->s_cap_lock); |
Yehuda Sadeh | 34d2376 | 2010-04-06 14:33:58 -0700 | [diff] [blame] | 1246 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
Sage Weil | b61c276 | 2011-08-09 15:03:46 -0700 | [diff] [blame] | 1247 | GFP_NOFS, false); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1248 | if (!msg) |
| 1249 | goto out_unlocked; |
| 1250 | dout("add_cap_releases %p msg %p now %d\n", session, msg, |
| 1251 | (int)msg->front.iov_len); |
| 1252 | head = msg->front.iov_base; |
| 1253 | head->num = cpu_to_le32(0); |
| 1254 | msg->front.iov_len = sizeof(*head); |
| 1255 | spin_lock(&session->s_cap_lock); |
| 1256 | list_add(&msg->list_head, &session->s_cap_releases); |
| 1257 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; |
| 1258 | } |
| 1259 | |
Sage Weil | 38e8883 | 2010-06-10 12:57:11 -0700 | [diff] [blame] | 1260 | if (partial) { |
| 1261 | head = partial->front.iov_base; |
| 1262 | num = le32_to_cpu(head->num); |
| 1263 | dout(" queueing partial %p with %d/%d\n", partial, num, |
| 1264 | (int)CEPH_CAPS_PER_RELEASE); |
| 1265 | list_move_tail(&partial->list_head, |
| 1266 | &session->s_cap_releases_done); |
| 1267 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1268 | } |
| 1269 | err = 0; |
| 1270 | spin_unlock(&session->s_cap_lock); |
| 1271 | out_unlocked: |
| 1272 | return err; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * flush all dirty inode data to disk. |
| 1277 | * |
| 1278 | * returns true if we've flushed through want_flush_seq |
| 1279 | */ |
| 1280 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) |
| 1281 | { |
| 1282 | int mds, ret = 1; |
| 1283 | |
| 1284 | dout("check_cap_flush want %lld\n", want_flush_seq); |
| 1285 | mutex_lock(&mdsc->mutex); |
| 1286 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { |
| 1287 | struct ceph_mds_session *session = mdsc->sessions[mds]; |
| 1288 | |
| 1289 | if (!session) |
| 1290 | continue; |
| 1291 | get_session(session); |
| 1292 | mutex_unlock(&mdsc->mutex); |
| 1293 | |
| 1294 | mutex_lock(&session->s_mutex); |
| 1295 | if (!list_empty(&session->s_cap_flushing)) { |
| 1296 | struct ceph_inode_info *ci = |
| 1297 | list_entry(session->s_cap_flushing.next, |
| 1298 | struct ceph_inode_info, |
| 1299 | i_flushing_item); |
| 1300 | struct inode *inode = &ci->vfs_inode; |
| 1301 | |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1302 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1303 | if (ci->i_cap_flush_seq <= want_flush_seq) { |
| 1304 | dout("check_cap_flush still flushing %p " |
| 1305 | "seq %lld <= %lld to mds%d\n", inode, |
| 1306 | ci->i_cap_flush_seq, want_flush_seq, |
| 1307 | session->s_mds); |
| 1308 | ret = 0; |
| 1309 | } |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 1310 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1311 | } |
| 1312 | mutex_unlock(&session->s_mutex); |
| 1313 | ceph_put_mds_session(session); |
| 1314 | |
| 1315 | if (!ret) |
| 1316 | return ret; |
| 1317 | mutex_lock(&mdsc->mutex); |
| 1318 | } |
| 1319 | |
| 1320 | mutex_unlock(&mdsc->mutex); |
| 1321 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); |
| 1322 | return ret; |
| 1323 | } |
| 1324 | |
| 1325 | /* |
| 1326 | * called under s_mutex |
| 1327 | */ |
Sage Weil | 3d7ded4 | 2010-06-09 16:47:10 -0700 | [diff] [blame] | 1328 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
| 1329 | struct ceph_mds_session *session) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1330 | { |
| 1331 | struct ceph_msg *msg; |
| 1332 | |
| 1333 | dout("send_cap_releases mds%d\n", session->s_mds); |
Sage Weil | 0f8605f | 2010-05-05 15:51:35 -0700 | [diff] [blame] | 1334 | spin_lock(&session->s_cap_lock); |
| 1335 | while (!list_empty(&session->s_cap_releases_done)) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1336 | msg = list_first_entry(&session->s_cap_releases_done, |
| 1337 | struct ceph_msg, list_head); |
| 1338 | list_del_init(&msg->list_head); |
| 1339 | spin_unlock(&session->s_cap_lock); |
| 1340 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
| 1341 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); |
| 1342 | ceph_con_send(&session->s_con, msg); |
Sage Weil | 0f8605f | 2010-05-05 15:51:35 -0700 | [diff] [blame] | 1343 | spin_lock(&session->s_cap_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1344 | } |
| 1345 | spin_unlock(&session->s_cap_lock); |
| 1346 | } |
| 1347 | |
Sage Weil | e01a594 | 2010-05-10 15:36:44 -0700 | [diff] [blame] | 1348 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
| 1349 | struct ceph_mds_session *session) |
| 1350 | { |
| 1351 | struct ceph_msg *msg; |
| 1352 | struct ceph_mds_cap_release *head; |
| 1353 | unsigned num; |
| 1354 | |
| 1355 | dout("discard_cap_releases mds%d\n", session->s_mds); |
| 1356 | spin_lock(&session->s_cap_lock); |
| 1357 | |
| 1358 | /* zero out the in-progress message */ |
| 1359 | msg = list_first_entry(&session->s_cap_releases, |
| 1360 | struct ceph_msg, list_head); |
| 1361 | head = msg->front.iov_base; |
| 1362 | num = le32_to_cpu(head->num); |
| 1363 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num); |
| 1364 | head->num = cpu_to_le32(0); |
| 1365 | session->s_num_cap_releases += num; |
| 1366 | |
| 1367 | /* requeue completed messages */ |
| 1368 | while (!list_empty(&session->s_cap_releases_done)) { |
| 1369 | msg = list_first_entry(&session->s_cap_releases_done, |
| 1370 | struct ceph_msg, list_head); |
| 1371 | list_del_init(&msg->list_head); |
| 1372 | |
| 1373 | head = msg->front.iov_base; |
| 1374 | num = le32_to_cpu(head->num); |
| 1375 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, |
| 1376 | num); |
| 1377 | session->s_num_cap_releases += num; |
| 1378 | head->num = cpu_to_le32(0); |
| 1379 | msg->front.iov_len = sizeof(*head); |
| 1380 | list_add(&msg->list_head, &session->s_cap_releases); |
| 1381 | } |
| 1382 | |
| 1383 | spin_unlock(&session->s_cap_lock); |
| 1384 | } |
| 1385 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1386 | /* |
| 1387 | * requests |
| 1388 | */ |
| 1389 | |
| 1390 | /* |
| 1391 | * Create an mds request. |
| 1392 | */ |
| 1393 | struct ceph_mds_request * |
| 1394 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) |
| 1395 | { |
| 1396 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); |
| 1397 | |
| 1398 | if (!req) |
| 1399 | return ERR_PTR(-ENOMEM); |
| 1400 | |
Sage Weil | b455639 | 2010-05-13 12:01:13 -0700 | [diff] [blame] | 1401 | mutex_init(&req->r_fill_mutex); |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 1402 | req->r_mdsc = mdsc; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1403 | req->r_started = jiffies; |
| 1404 | req->r_resend_mds = -1; |
| 1405 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); |
| 1406 | req->r_fmode = -1; |
Sage Weil | 153c8e6 | 2009-12-07 12:31:09 -0800 | [diff] [blame] | 1407 | kref_init(&req->r_kref); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1408 | INIT_LIST_HEAD(&req->r_wait); |
| 1409 | init_completion(&req->r_completion); |
| 1410 | init_completion(&req->r_safe_completion); |
| 1411 | INIT_LIST_HEAD(&req->r_unsafe_item); |
| 1412 | |
| 1413 | req->r_op = op; |
| 1414 | req->r_direct_mode = mode; |
| 1415 | return req; |
| 1416 | } |
| 1417 | |
| 1418 | /* |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1419 | * return oldest (lowest) request, tid in request tree, 0 if none. |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1420 | * |
| 1421 | * called under mdsc->mutex. |
| 1422 | */ |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1423 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
| 1424 | { |
| 1425 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) |
| 1426 | return NULL; |
| 1427 | return rb_entry(rb_first(&mdsc->request_tree), |
| 1428 | struct ceph_mds_request, r_node); |
| 1429 | } |
| 1430 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1431 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
| 1432 | { |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1433 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
| 1434 | |
| 1435 | if (req) |
| 1436 | return req->r_tid; |
| 1437 | return 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1438 | } |
| 1439 | |
| 1440 | /* |
| 1441 | * Build a dentry's path. Allocate on heap; caller must kfree. Based |
| 1442 | * on build_path_from_dentry in fs/cifs/dir.c. |
| 1443 | * |
| 1444 | * If @stop_on_nosnap, generate path relative to the first non-snapped |
| 1445 | * inode. |
| 1446 | * |
| 1447 | * Encode hidden .snap dirs as a double /, i.e. |
| 1448 | * foo/.snap/bar -> foo//bar |
| 1449 | */ |
| 1450 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, |
| 1451 | int stop_on_nosnap) |
| 1452 | { |
| 1453 | struct dentry *temp; |
| 1454 | char *path; |
| 1455 | int len, pos; |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1456 | unsigned seq; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1457 | |
| 1458 | if (dentry == NULL) |
| 1459 | return ERR_PTR(-EINVAL); |
| 1460 | |
| 1461 | retry: |
| 1462 | len = 0; |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1463 | seq = read_seqbegin(&rename_lock); |
| 1464 | rcu_read_lock(); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1465 | for (temp = dentry; !IS_ROOT(temp);) { |
| 1466 | struct inode *inode = temp->d_inode; |
| 1467 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) |
| 1468 | len++; /* slash only */ |
| 1469 | else if (stop_on_nosnap && inode && |
| 1470 | ceph_snap(inode) == CEPH_NOSNAP) |
| 1471 | break; |
| 1472 | else |
| 1473 | len += 1 + temp->d_name.len; |
| 1474 | temp = temp->d_parent; |
| 1475 | if (temp == NULL) { |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1476 | rcu_read_unlock(); |
Sage Weil | 6c99f25 | 2010-05-10 16:12:25 -0700 | [diff] [blame] | 1477 | pr_err("build_path corrupt dentry %p\n", dentry); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1478 | return ERR_PTR(-EINVAL); |
| 1479 | } |
| 1480 | } |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1481 | rcu_read_unlock(); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1482 | if (len) |
| 1483 | len--; /* no leading '/' */ |
| 1484 | |
| 1485 | path = kmalloc(len+1, GFP_NOFS); |
| 1486 | if (path == NULL) |
| 1487 | return ERR_PTR(-ENOMEM); |
| 1488 | pos = len; |
| 1489 | path[pos] = 0; /* trailing null */ |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1490 | rcu_read_lock(); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1491 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1492 | struct inode *inode; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1493 | |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1494 | spin_lock(&temp->d_lock); |
| 1495 | inode = temp->d_inode; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1496 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
Sage Weil | 104648a | 2010-03-18 10:14:30 -0700 | [diff] [blame] | 1497 | dout("build_path path+%d: %p SNAPDIR\n", |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1498 | pos, temp); |
| 1499 | } else if (stop_on_nosnap && inode && |
| 1500 | ceph_snap(inode) == CEPH_NOSNAP) { |
Yehuda Sadeh | 9d5a09e | 2011-12-13 09:57:44 -0800 | [diff] [blame] | 1501 | spin_unlock(&temp->d_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1502 | break; |
| 1503 | } else { |
| 1504 | pos -= temp->d_name.len; |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1505 | if (pos < 0) { |
| 1506 | spin_unlock(&temp->d_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1507 | break; |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1508 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1509 | strncpy(path + pos, temp->d_name.name, |
| 1510 | temp->d_name.len); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1511 | } |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1512 | spin_unlock(&temp->d_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1513 | if (pos) |
| 1514 | path[--pos] = '/'; |
| 1515 | temp = temp->d_parent; |
| 1516 | if (temp == NULL) { |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1517 | rcu_read_unlock(); |
Sage Weil | 104648a | 2010-03-18 10:14:30 -0700 | [diff] [blame] | 1518 | pr_err("build_path corrupt dentry\n"); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1519 | kfree(path); |
| 1520 | return ERR_PTR(-EINVAL); |
| 1521 | } |
| 1522 | } |
Al Viro | 1b71fe2 | 2011-07-16 23:43:58 -0400 | [diff] [blame] | 1523 | rcu_read_unlock(); |
| 1524 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { |
Sage Weil | 104648a | 2010-03-18 10:14:30 -0700 | [diff] [blame] | 1525 | pr_err("build_path did not end path lookup where " |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1526 | "expected, namelen is %d, pos is %d\n", len, pos); |
| 1527 | /* presumably this is only possible if racing with a |
| 1528 | rename of one of the parent directories (we can not |
| 1529 | lock the dentries above us to prevent this, but |
| 1530 | retrying should be harmless) */ |
| 1531 | kfree(path); |
| 1532 | goto retry; |
| 1533 | } |
| 1534 | |
| 1535 | *base = ceph_ino(temp->d_inode); |
| 1536 | *plen = len; |
Sage Weil | 104648a | 2010-03-18 10:14:30 -0700 | [diff] [blame] | 1537 | dout("build_path on %p %d built %llx '%.*s'\n", |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 1538 | dentry, dentry->d_count, *base, len, path); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1539 | return path; |
| 1540 | } |
| 1541 | |
| 1542 | static int build_dentry_path(struct dentry *dentry, |
| 1543 | const char **ppath, int *ppathlen, u64 *pino, |
| 1544 | int *pfreepath) |
| 1545 | { |
| 1546 | char *path; |
| 1547 | |
| 1548 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { |
| 1549 | *pino = ceph_ino(dentry->d_parent->d_inode); |
| 1550 | *ppath = dentry->d_name.name; |
| 1551 | *ppathlen = dentry->d_name.len; |
| 1552 | return 0; |
| 1553 | } |
| 1554 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); |
| 1555 | if (IS_ERR(path)) |
| 1556 | return PTR_ERR(path); |
| 1557 | *ppath = path; |
| 1558 | *pfreepath = 1; |
| 1559 | return 0; |
| 1560 | } |
| 1561 | |
| 1562 | static int build_inode_path(struct inode *inode, |
| 1563 | const char **ppath, int *ppathlen, u64 *pino, |
| 1564 | int *pfreepath) |
| 1565 | { |
| 1566 | struct dentry *dentry; |
| 1567 | char *path; |
| 1568 | |
| 1569 | if (ceph_snap(inode) == CEPH_NOSNAP) { |
| 1570 | *pino = ceph_ino(inode); |
| 1571 | *ppathlen = 0; |
| 1572 | return 0; |
| 1573 | } |
| 1574 | dentry = d_find_alias(inode); |
| 1575 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); |
| 1576 | dput(dentry); |
| 1577 | if (IS_ERR(path)) |
| 1578 | return PTR_ERR(path); |
| 1579 | *ppath = path; |
| 1580 | *pfreepath = 1; |
| 1581 | return 0; |
| 1582 | } |
| 1583 | |
| 1584 | /* |
| 1585 | * request arguments may be specified via an inode *, a dentry *, or |
| 1586 | * an explicit ino+path. |
| 1587 | */ |
| 1588 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, |
| 1589 | const char *rpath, u64 rino, |
| 1590 | const char **ppath, int *pathlen, |
| 1591 | u64 *ino, int *freepath) |
| 1592 | { |
| 1593 | int r = 0; |
| 1594 | |
| 1595 | if (rinode) { |
| 1596 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); |
| 1597 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), |
| 1598 | ceph_snap(rinode)); |
| 1599 | } else if (rdentry) { |
| 1600 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); |
| 1601 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, |
| 1602 | *ppath); |
Sage Weil | 795858d | 2011-08-15 13:02:37 -0700 | [diff] [blame] | 1603 | } else if (rpath || rino) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1604 | *ino = rino; |
| 1605 | *ppath = rpath; |
| 1606 | *pathlen = strlen(rpath); |
| 1607 | dout(" path %.*s\n", *pathlen, rpath); |
| 1608 | } |
| 1609 | |
| 1610 | return r; |
| 1611 | } |
| 1612 | |
| 1613 | /* |
| 1614 | * called under mdsc->mutex |
| 1615 | */ |
| 1616 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, |
| 1617 | struct ceph_mds_request *req, |
| 1618 | int mds) |
| 1619 | { |
| 1620 | struct ceph_msg *msg; |
| 1621 | struct ceph_mds_request_head *head; |
| 1622 | const char *path1 = NULL; |
| 1623 | const char *path2 = NULL; |
| 1624 | u64 ino1 = 0, ino2 = 0; |
| 1625 | int pathlen1 = 0, pathlen2 = 0; |
| 1626 | int freepath1 = 0, freepath2 = 0; |
| 1627 | int len; |
| 1628 | u16 releases; |
| 1629 | void *p, *end; |
| 1630 | int ret; |
| 1631 | |
| 1632 | ret = set_request_path_attr(req->r_inode, req->r_dentry, |
| 1633 | req->r_path1, req->r_ino1.ino, |
| 1634 | &path1, &pathlen1, &ino1, &freepath1); |
| 1635 | if (ret < 0) { |
| 1636 | msg = ERR_PTR(ret); |
| 1637 | goto out; |
| 1638 | } |
| 1639 | |
| 1640 | ret = set_request_path_attr(NULL, req->r_old_dentry, |
| 1641 | req->r_path2, req->r_ino2.ino, |
| 1642 | &path2, &pathlen2, &ino2, &freepath2); |
| 1643 | if (ret < 0) { |
| 1644 | msg = ERR_PTR(ret); |
| 1645 | goto out_free1; |
| 1646 | } |
| 1647 | |
| 1648 | len = sizeof(*head) + |
Sage Weil | ac8839d | 2010-01-27 14:28:10 -0800 | [diff] [blame] | 1649 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1650 | |
| 1651 | /* calculate (max) length for cap releases */ |
| 1652 | len += sizeof(struct ceph_mds_request_release) * |
| 1653 | (!!req->r_inode_drop + !!req->r_dentry_drop + |
| 1654 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); |
| 1655 | if (req->r_dentry_drop) |
| 1656 | len += req->r_dentry->d_name.len; |
| 1657 | if (req->r_old_dentry_drop) |
| 1658 | len += req->r_old_dentry->d_name.len; |
| 1659 | |
Sage Weil | b61c276 | 2011-08-09 15:03:46 -0700 | [diff] [blame] | 1660 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 1661 | if (!msg) { |
| 1662 | msg = ERR_PTR(-ENOMEM); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1663 | goto out_free2; |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 1664 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1665 | |
Sage Weil | 6df058c | 2009-12-22 11:24:33 -0800 | [diff] [blame] | 1666 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
| 1667 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1668 | head = msg->front.iov_base; |
| 1669 | p = msg->front.iov_base + sizeof(*head); |
| 1670 | end = msg->front.iov_base + msg->front.iov_len; |
| 1671 | |
| 1672 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); |
| 1673 | head->op = cpu_to_le32(req->r_op); |
Sage Weil | cb4276c | 2010-11-08 07:28:52 -0800 | [diff] [blame] | 1674 | head->caller_uid = cpu_to_le32(req->r_uid); |
| 1675 | head->caller_gid = cpu_to_le32(req->r_gid); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1676 | head->args = req->r_args; |
| 1677 | |
| 1678 | ceph_encode_filepath(&p, end, ino1, path1); |
| 1679 | ceph_encode_filepath(&p, end, ino2, path2); |
| 1680 | |
Sage Weil | e979cf5 | 2010-07-15 14:58:39 -0700 | [diff] [blame] | 1681 | /* make note of release offset, in case we need to replay */ |
| 1682 | req->r_request_release_offset = p - msg->front.iov_base; |
| 1683 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1684 | /* cap releases */ |
| 1685 | releases = 0; |
| 1686 | if (req->r_inode_drop) |
| 1687 | releases += ceph_encode_inode_release(&p, |
| 1688 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, |
| 1689 | mds, req->r_inode_drop, req->r_inode_unless, 0); |
| 1690 | if (req->r_dentry_drop) |
| 1691 | releases += ceph_encode_dentry_release(&p, req->r_dentry, |
| 1692 | mds, req->r_dentry_drop, req->r_dentry_unless); |
| 1693 | if (req->r_old_dentry_drop) |
| 1694 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, |
| 1695 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); |
| 1696 | if (req->r_old_inode_drop) |
| 1697 | releases += ceph_encode_inode_release(&p, |
| 1698 | req->r_old_dentry->d_inode, |
| 1699 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); |
| 1700 | head->num_releases = cpu_to_le16(releases); |
| 1701 | |
| 1702 | BUG_ON(p > end); |
| 1703 | msg->front.iov_len = p - msg->front.iov_base; |
| 1704 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
| 1705 | |
| 1706 | msg->pages = req->r_pages; |
| 1707 | msg->nr_pages = req->r_num_pages; |
| 1708 | msg->hdr.data_len = cpu_to_le32(req->r_data_len); |
| 1709 | msg->hdr.data_off = cpu_to_le16(0); |
| 1710 | |
| 1711 | out_free2: |
| 1712 | if (freepath2) |
| 1713 | kfree((char *)path2); |
| 1714 | out_free1: |
| 1715 | if (freepath1) |
| 1716 | kfree((char *)path1); |
| 1717 | out: |
| 1718 | return msg; |
| 1719 | } |
| 1720 | |
| 1721 | /* |
| 1722 | * called under mdsc->mutex if error, under no mutex if |
| 1723 | * success. |
| 1724 | */ |
| 1725 | static void complete_request(struct ceph_mds_client *mdsc, |
| 1726 | struct ceph_mds_request *req) |
| 1727 | { |
| 1728 | if (req->r_callback) |
| 1729 | req->r_callback(mdsc, req); |
| 1730 | else |
Yehuda Sadeh | 03066f2 | 2010-07-27 13:11:08 -0700 | [diff] [blame] | 1731 | complete_all(&req->r_completion); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1732 | } |
| 1733 | |
| 1734 | /* |
| 1735 | * called under mdsc->mutex |
| 1736 | */ |
| 1737 | static int __prepare_send_request(struct ceph_mds_client *mdsc, |
| 1738 | struct ceph_mds_request *req, |
| 1739 | int mds) |
| 1740 | { |
| 1741 | struct ceph_mds_request_head *rhead; |
| 1742 | struct ceph_msg *msg; |
| 1743 | int flags = 0; |
| 1744 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1745 | req->r_attempts++; |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 1746 | if (req->r_inode) { |
| 1747 | struct ceph_cap *cap = |
| 1748 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); |
| 1749 | |
| 1750 | if (cap) |
| 1751 | req->r_sent_on_mseq = cap->mseq; |
| 1752 | else |
| 1753 | req->r_sent_on_mseq = -1; |
| 1754 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1755 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
| 1756 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); |
| 1757 | |
Sage Weil | 01a92f1 | 2010-07-15 13:24:32 -0700 | [diff] [blame] | 1758 | if (req->r_got_unsafe) { |
| 1759 | /* |
| 1760 | * Replay. Do not regenerate message (and rebuild |
| 1761 | * paths, etc.); just use the original message. |
| 1762 | * Rebuilding paths will break for renames because |
| 1763 | * d_move mangles the src name. |
| 1764 | */ |
| 1765 | msg = req->r_request; |
| 1766 | rhead = msg->front.iov_base; |
| 1767 | |
| 1768 | flags = le32_to_cpu(rhead->flags); |
| 1769 | flags |= CEPH_MDS_FLAG_REPLAY; |
| 1770 | rhead->flags = cpu_to_le32(flags); |
| 1771 | |
| 1772 | if (req->r_target_inode) |
| 1773 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); |
| 1774 | |
| 1775 | rhead->num_retry = req->r_attempts - 1; |
Sage Weil | e979cf5 | 2010-07-15 14:58:39 -0700 | [diff] [blame] | 1776 | |
| 1777 | /* remove cap/dentry releases from message */ |
| 1778 | rhead->num_releases = 0; |
| 1779 | msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset); |
| 1780 | msg->front.iov_len = req->r_request_release_offset; |
Sage Weil | 01a92f1 | 2010-07-15 13:24:32 -0700 | [diff] [blame] | 1781 | return 0; |
| 1782 | } |
| 1783 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1784 | if (req->r_request) { |
| 1785 | ceph_msg_put(req->r_request); |
| 1786 | req->r_request = NULL; |
| 1787 | } |
| 1788 | msg = create_request_message(mdsc, req, mds); |
| 1789 | if (IS_ERR(msg)) { |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1790 | req->r_err = PTR_ERR(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1791 | complete_request(mdsc, req); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 1792 | return PTR_ERR(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1793 | } |
| 1794 | req->r_request = msg; |
| 1795 | |
| 1796 | rhead = msg->front.iov_base; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1797 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
| 1798 | if (req->r_got_unsafe) |
| 1799 | flags |= CEPH_MDS_FLAG_REPLAY; |
| 1800 | if (req->r_locked_dir) |
| 1801 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; |
| 1802 | rhead->flags = cpu_to_le32(flags); |
| 1803 | rhead->num_fwd = req->r_num_fwd; |
| 1804 | rhead->num_retry = req->r_attempts - 1; |
Sage Weil | 01a92f1 | 2010-07-15 13:24:32 -0700 | [diff] [blame] | 1805 | rhead->ino = 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1806 | |
| 1807 | dout(" r_locked_dir = %p\n", req->r_locked_dir); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1808 | return 0; |
| 1809 | } |
| 1810 | |
| 1811 | /* |
| 1812 | * send request, or put it on the appropriate wait list. |
| 1813 | */ |
| 1814 | static int __do_request(struct ceph_mds_client *mdsc, |
| 1815 | struct ceph_mds_request *req) |
| 1816 | { |
| 1817 | struct ceph_mds_session *session = NULL; |
| 1818 | int mds = -1; |
| 1819 | int err = -EAGAIN; |
| 1820 | |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1821 | if (req->r_err || req->r_got_result) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1822 | goto out; |
| 1823 | |
| 1824 | if (req->r_timeout && |
| 1825 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { |
| 1826 | dout("do_request timed out\n"); |
| 1827 | err = -EIO; |
| 1828 | goto finish; |
| 1829 | } |
| 1830 | |
Sage Weil | dc69e2e | 2010-11-02 13:49:00 -0700 | [diff] [blame] | 1831 | put_request_session(req); |
| 1832 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1833 | mds = __choose_mds(mdsc, req); |
| 1834 | if (mds < 0 || |
| 1835 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { |
| 1836 | dout("do_request no mds or not active, waiting for map\n"); |
| 1837 | list_add(&req->r_wait, &mdsc->waiting_for_map); |
| 1838 | goto out; |
| 1839 | } |
| 1840 | |
| 1841 | /* get, open session */ |
| 1842 | session = __ceph_lookup_mds_session(mdsc, mds); |
Sage Weil | 9c423956 | 2010-03-20 20:43:28 -0700 | [diff] [blame] | 1843 | if (!session) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1844 | session = register_session(mdsc, mds); |
Sage Weil | 9c423956 | 2010-03-20 20:43:28 -0700 | [diff] [blame] | 1845 | if (IS_ERR(session)) { |
| 1846 | err = PTR_ERR(session); |
| 1847 | goto finish; |
| 1848 | } |
| 1849 | } |
Sage Weil | dc69e2e | 2010-11-02 13:49:00 -0700 | [diff] [blame] | 1850 | req->r_session = get_session(session); |
| 1851 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1852 | dout("do_request mds%d session %p state %s\n", mds, session, |
| 1853 | session_state_name(session->s_state)); |
| 1854 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
| 1855 | session->s_state != CEPH_MDS_SESSION_HUNG) { |
| 1856 | if (session->s_state == CEPH_MDS_SESSION_NEW || |
| 1857 | session->s_state == CEPH_MDS_SESSION_CLOSING) |
| 1858 | __open_session(mdsc, session); |
| 1859 | list_add(&req->r_wait, &session->s_waiting); |
| 1860 | goto out_session; |
| 1861 | } |
| 1862 | |
| 1863 | /* send request */ |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1864 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
| 1865 | |
| 1866 | if (req->r_request_started == 0) /* note request start time */ |
| 1867 | req->r_request_started = jiffies; |
| 1868 | |
| 1869 | err = __prepare_send_request(mdsc, req, mds); |
| 1870 | if (!err) { |
| 1871 | ceph_msg_get(req->r_request); |
| 1872 | ceph_con_send(&session->s_con, req->r_request); |
| 1873 | } |
| 1874 | |
| 1875 | out_session: |
| 1876 | ceph_put_mds_session(session); |
| 1877 | out: |
| 1878 | return err; |
| 1879 | |
| 1880 | finish: |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1881 | req->r_err = err; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1882 | complete_request(mdsc, req); |
| 1883 | goto out; |
| 1884 | } |
| 1885 | |
| 1886 | /* |
| 1887 | * called under mdsc->mutex |
| 1888 | */ |
| 1889 | static void __wake_requests(struct ceph_mds_client *mdsc, |
| 1890 | struct list_head *head) |
| 1891 | { |
| 1892 | struct ceph_mds_request *req, *nreq; |
| 1893 | |
| 1894 | list_for_each_entry_safe(req, nreq, head, r_wait) { |
| 1895 | list_del_init(&req->r_wait); |
| 1896 | __do_request(mdsc, req); |
| 1897 | } |
| 1898 | } |
| 1899 | |
| 1900 | /* |
| 1901 | * Wake up threads with requests pending for @mds, so that they can |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 1902 | * resubmit their requests to a possibly different mds. |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1903 | */ |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 1904 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1905 | { |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1906 | struct ceph_mds_request *req; |
| 1907 | struct rb_node *p; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1908 | |
| 1909 | dout("kick_requests mds%d\n", mds); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1910 | for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
| 1911 | req = rb_entry(p, struct ceph_mds_request, r_node); |
| 1912 | if (req->r_got_unsafe) |
| 1913 | continue; |
| 1914 | if (req->r_session && |
| 1915 | req->r_session->s_mds == mds) { |
| 1916 | dout(" kicking tid %llu\n", req->r_tid); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 1917 | __do_request(mdsc, req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1918 | } |
| 1919 | } |
| 1920 | } |
| 1921 | |
| 1922 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, |
| 1923 | struct ceph_mds_request *req) |
| 1924 | { |
| 1925 | dout("submit_request on %p\n", req); |
| 1926 | mutex_lock(&mdsc->mutex); |
| 1927 | __register_request(mdsc, req, NULL); |
| 1928 | __do_request(mdsc, req); |
| 1929 | mutex_unlock(&mdsc->mutex); |
| 1930 | } |
| 1931 | |
| 1932 | /* |
| 1933 | * Synchrously perform an mds request. Take care of all of the |
| 1934 | * session setup, forwarding, retry details. |
| 1935 | */ |
| 1936 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, |
| 1937 | struct inode *dir, |
| 1938 | struct ceph_mds_request *req) |
| 1939 | { |
| 1940 | int err; |
| 1941 | |
| 1942 | dout("do_request on %p\n", req); |
| 1943 | |
| 1944 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ |
| 1945 | if (req->r_inode) |
| 1946 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
| 1947 | if (req->r_locked_dir) |
| 1948 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
| 1949 | if (req->r_old_dentry) |
Sage Weil | 41b02e1 | 2011-07-26 11:31:14 -0700 | [diff] [blame] | 1950 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
| 1951 | CEPH_CAP_PIN); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1952 | |
| 1953 | /* issue */ |
| 1954 | mutex_lock(&mdsc->mutex); |
| 1955 | __register_request(mdsc, req, dir); |
| 1956 | __do_request(mdsc, req); |
| 1957 | |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1958 | if (req->r_err) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1959 | err = req->r_err; |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1960 | __unregister_request(mdsc, req); |
| 1961 | dout("do_request early error %d\n", err); |
| 1962 | goto out; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1963 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 1964 | |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1965 | /* wait */ |
| 1966 | mutex_unlock(&mdsc->mutex); |
| 1967 | dout("do_request waiting\n"); |
| 1968 | if (req->r_timeout) { |
Sage Weil | aa91647 | 2010-05-24 11:15:51 -0700 | [diff] [blame] | 1969 | err = (long)wait_for_completion_killable_timeout( |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1970 | &req->r_completion, req->r_timeout); |
| 1971 | if (err == 0) |
| 1972 | err = -EIO; |
| 1973 | } else { |
Sage Weil | aa91647 | 2010-05-24 11:15:51 -0700 | [diff] [blame] | 1974 | err = wait_for_completion_killable(&req->r_completion); |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1975 | } |
| 1976 | dout("do_request waited, got %d\n", err); |
| 1977 | mutex_lock(&mdsc->mutex); |
| 1978 | |
| 1979 | /* only abort if we didn't race with a real reply */ |
| 1980 | if (req->r_got_result) { |
| 1981 | err = le32_to_cpu(req->r_reply_info.head->result); |
| 1982 | } else if (err < 0) { |
| 1983 | dout("aborted request %lld with %d\n", req->r_tid, err); |
Sage Weil | b455639 | 2010-05-13 12:01:13 -0700 | [diff] [blame] | 1984 | |
| 1985 | /* |
| 1986 | * ensure we aren't running concurrently with |
| 1987 | * ceph_fill_trace or ceph_readdir_prepopulate, which |
| 1988 | * rely on locks (dir mutex) held by our caller. |
| 1989 | */ |
| 1990 | mutex_lock(&req->r_fill_mutex); |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1991 | req->r_err = err; |
| 1992 | req->r_aborted = true; |
Sage Weil | b455639 | 2010-05-13 12:01:13 -0700 | [diff] [blame] | 1993 | mutex_unlock(&req->r_fill_mutex); |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1994 | |
| 1995 | if (req->r_locked_dir && |
Sage Weil | 167c9e3 | 2010-05-14 10:02:57 -0700 | [diff] [blame] | 1996 | (req->r_op & CEPH_MDS_OP_WRITE)) |
| 1997 | ceph_invalidate_dir_request(req); |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 1998 | } else { |
| 1999 | err = req->r_err; |
| 2000 | } |
| 2001 | |
| 2002 | out: |
| 2003 | mutex_unlock(&mdsc->mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2004 | dout("do_request %p done, result %d\n", req, err); |
| 2005 | return err; |
| 2006 | } |
| 2007 | |
| 2008 | /* |
Sage Weil | c6ffe10 | 2011-11-03 09:23:36 -0700 | [diff] [blame] | 2009 | * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS |
Sage Weil | 167c9e3 | 2010-05-14 10:02:57 -0700 | [diff] [blame] | 2010 | * namespace request. |
| 2011 | */ |
| 2012 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) |
| 2013 | { |
| 2014 | struct inode *inode = req->r_locked_dir; |
| 2015 | struct ceph_inode_info *ci = ceph_inode(inode); |
| 2016 | |
Sage Weil | c6ffe10 | 2011-11-03 09:23:36 -0700 | [diff] [blame] | 2017 | dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode); |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 2018 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | c6ffe10 | 2011-11-03 09:23:36 -0700 | [diff] [blame] | 2019 | ceph_dir_clear_complete(inode); |
Sage Weil | 167c9e3 | 2010-05-14 10:02:57 -0700 | [diff] [blame] | 2020 | ci->i_release_count++; |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 2021 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 167c9e3 | 2010-05-14 10:02:57 -0700 | [diff] [blame] | 2022 | |
| 2023 | if (req->r_dentry) |
| 2024 | ceph_invalidate_dentry_lease(req->r_dentry); |
| 2025 | if (req->r_old_dentry) |
| 2026 | ceph_invalidate_dentry_lease(req->r_old_dentry); |
| 2027 | } |
| 2028 | |
| 2029 | /* |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2030 | * Handle mds reply. |
| 2031 | * |
| 2032 | * We take the session mutex and parse and process the reply immediately. |
| 2033 | * This preserves the logical ordering of replies, capabilities, etc., sent |
| 2034 | * by the MDS as they are applied to our local cache. |
| 2035 | */ |
| 2036 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) |
| 2037 | { |
| 2038 | struct ceph_mds_client *mdsc = session->s_mdsc; |
| 2039 | struct ceph_mds_request *req; |
| 2040 | struct ceph_mds_reply_head *head = msg->front.iov_base; |
| 2041 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ |
| 2042 | u64 tid; |
| 2043 | int err, result; |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2044 | int mds = session->s_mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2045 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2046 | if (msg->front.iov_len < sizeof(*head)) { |
| 2047 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); |
Sage Weil | 9ec7cab | 2009-12-14 15:13:47 -0800 | [diff] [blame] | 2048 | ceph_msg_dump(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2049 | return; |
| 2050 | } |
| 2051 | |
| 2052 | /* get request, session */ |
Sage Weil | 6df058c | 2009-12-22 11:24:33 -0800 | [diff] [blame] | 2053 | tid = le64_to_cpu(msg->hdr.tid); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2054 | mutex_lock(&mdsc->mutex); |
| 2055 | req = __lookup_request(mdsc, tid); |
| 2056 | if (!req) { |
| 2057 | dout("handle_reply on unknown tid %llu\n", tid); |
| 2058 | mutex_unlock(&mdsc->mutex); |
| 2059 | return; |
| 2060 | } |
| 2061 | dout("handle_reply %p\n", req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2062 | |
| 2063 | /* correct session? */ |
Sage Weil | d96d604 | 2010-03-20 20:50:58 -0700 | [diff] [blame] | 2064 | if (req->r_session != session) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2065 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
| 2066 | " not mds%d\n", tid, session->s_mds, |
| 2067 | req->r_session ? req->r_session->s_mds : -1); |
| 2068 | mutex_unlock(&mdsc->mutex); |
| 2069 | goto out; |
| 2070 | } |
| 2071 | |
| 2072 | /* dup? */ |
| 2073 | if ((req->r_got_unsafe && !head->safe) || |
| 2074 | (req->r_got_safe && head->safe)) { |
| 2075 | pr_warning("got a dup %s reply on %llu from mds%d\n", |
| 2076 | head->safe ? "safe" : "unsafe", tid, mds); |
| 2077 | mutex_unlock(&mdsc->mutex); |
| 2078 | goto out; |
| 2079 | } |
Sage Weil | 85792d0d | 2010-05-13 09:06:02 -0700 | [diff] [blame] | 2080 | if (req->r_got_safe && !head->safe) { |
| 2081 | pr_warning("got unsafe after safe on %llu from mds%d\n", |
| 2082 | tid, mds); |
| 2083 | mutex_unlock(&mdsc->mutex); |
| 2084 | goto out; |
| 2085 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2086 | |
| 2087 | result = le32_to_cpu(head->result); |
| 2088 | |
| 2089 | /* |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2090 | * Handle an ESTALE |
| 2091 | * if we're not talking to the authority, send to them |
| 2092 | * if the authority has changed while we weren't looking, |
| 2093 | * send to new authority |
| 2094 | * Otherwise we just have to return an ESTALE |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2095 | */ |
| 2096 | if (result == -ESTALE) { |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2097 | dout("got ESTALE on request %llu", req->r_tid); |
Sage Weil | 213c99e | 2010-08-03 10:25:11 -0700 | [diff] [blame] | 2098 | if (!req->r_inode) { |
| 2099 | /* do nothing; not an authority problem */ |
| 2100 | } else if (req->r_direct_mode != USE_AUTH_MDS) { |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2101 | dout("not using auth, setting for that now"); |
| 2102 | req->r_direct_mode = USE_AUTH_MDS; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2103 | __do_request(mdsc, req); |
| 2104 | mutex_unlock(&mdsc->mutex); |
| 2105 | goto out; |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2106 | } else { |
| 2107 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); |
Sage Weil | 4af25fd | 2010-11-02 13:41:47 -0700 | [diff] [blame] | 2108 | struct ceph_cap *cap = NULL; |
| 2109 | |
| 2110 | if (req->r_session) |
| 2111 | cap = ceph_get_cap_for_mds(ci, |
| 2112 | req->r_session->s_mds); |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2113 | |
| 2114 | dout("already using auth"); |
| 2115 | if ((!cap || cap != ci->i_auth_cap) || |
| 2116 | (cap->mseq != req->r_sent_on_mseq)) { |
| 2117 | dout("but cap changed, so resending"); |
| 2118 | __do_request(mdsc, req); |
| 2119 | mutex_unlock(&mdsc->mutex); |
| 2120 | goto out; |
| 2121 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2122 | } |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2123 | dout("have to return ESTALE on request %llu", req->r_tid); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2124 | } |
| 2125 | |
Greg Farnum | e55b71f | 2010-06-22 15:58:01 -0700 | [diff] [blame] | 2126 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2127 | if (head->safe) { |
| 2128 | req->r_got_safe = true; |
| 2129 | __unregister_request(mdsc, req); |
Yehuda Sadeh | 03066f2 | 2010-07-27 13:11:08 -0700 | [diff] [blame] | 2130 | complete_all(&req->r_safe_completion); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2131 | |
| 2132 | if (req->r_got_unsafe) { |
| 2133 | /* |
| 2134 | * We already handled the unsafe response, now do the |
| 2135 | * cleanup. No need to examine the response; the MDS |
| 2136 | * doesn't include any result info in the safe |
| 2137 | * response. And even if it did, there is nothing |
| 2138 | * useful we could do with a revised return value. |
| 2139 | */ |
| 2140 | dout("got safe reply %llu, mds%d\n", tid, mds); |
| 2141 | list_del_init(&req->r_unsafe_item); |
| 2142 | |
| 2143 | /* last unsafe request during umount? */ |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 2144 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
Yehuda Sadeh | 03066f2 | 2010-07-27 13:11:08 -0700 | [diff] [blame] | 2145 | complete_all(&mdsc->safe_umount_waiters); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2146 | mutex_unlock(&mdsc->mutex); |
| 2147 | goto out; |
| 2148 | } |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 2149 | } else { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2150 | req->r_got_unsafe = true; |
| 2151 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); |
| 2152 | } |
| 2153 | |
| 2154 | dout("handle_reply tid %lld result %d\n", tid, result); |
| 2155 | rinfo = &req->r_reply_info; |
Sage Weil | 14303d2 | 2010-12-14 17:37:52 -0800 | [diff] [blame] | 2156 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2157 | mutex_unlock(&mdsc->mutex); |
| 2158 | |
| 2159 | mutex_lock(&session->s_mutex); |
| 2160 | if (err < 0) { |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 2161 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
Sage Weil | 9ec7cab | 2009-12-14 15:13:47 -0800 | [diff] [blame] | 2162 | ceph_msg_dump(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2163 | goto out_err; |
| 2164 | } |
| 2165 | |
| 2166 | /* snap trace */ |
| 2167 | if (rinfo->snapblob_len) { |
| 2168 | down_write(&mdsc->snap_rwsem); |
| 2169 | ceph_update_snap_trace(mdsc, rinfo->snapblob, |
| 2170 | rinfo->snapblob + rinfo->snapblob_len, |
| 2171 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); |
| 2172 | downgrade_write(&mdsc->snap_rwsem); |
| 2173 | } else { |
| 2174 | down_read(&mdsc->snap_rwsem); |
| 2175 | } |
| 2176 | |
| 2177 | /* insert trace into our cache */ |
Sage Weil | b455639 | 2010-05-13 12:01:13 -0700 | [diff] [blame] | 2178 | mutex_lock(&req->r_fill_mutex); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 2179 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2180 | if (err == 0) { |
Herb Shiu | 25933ab | 2010-12-01 14:14:38 -0800 | [diff] [blame] | 2181 | if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK && |
| 2182 | rinfo->dir_nr) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2183 | ceph_readdir_prepopulate(req, req->r_session); |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 2184 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2185 | } |
Sage Weil | b455639 | 2010-05-13 12:01:13 -0700 | [diff] [blame] | 2186 | mutex_unlock(&req->r_fill_mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2187 | |
| 2188 | up_read(&mdsc->snap_rwsem); |
| 2189 | out_err: |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 2190 | mutex_lock(&mdsc->mutex); |
| 2191 | if (!req->r_aborted) { |
| 2192 | if (err) { |
| 2193 | req->r_err = err; |
| 2194 | } else { |
| 2195 | req->r_reply = msg; |
| 2196 | ceph_msg_get(msg); |
| 2197 | req->r_got_result = true; |
| 2198 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2199 | } else { |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 2200 | dout("reply arrived after request %lld was aborted\n", tid); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2201 | } |
Sage Weil | e1518c7 | 2010-05-13 11:19:06 -0700 | [diff] [blame] | 2202 | mutex_unlock(&mdsc->mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2203 | |
Sage Weil | ee6b272 | 2010-06-10 12:55:52 -0700 | [diff] [blame] | 2204 | ceph_add_cap_releases(mdsc, req->r_session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2205 | mutex_unlock(&session->s_mutex); |
| 2206 | |
| 2207 | /* kick calling process */ |
| 2208 | complete_request(mdsc, req); |
| 2209 | out: |
| 2210 | ceph_mdsc_put_request(req); |
| 2211 | return; |
| 2212 | } |
| 2213 | |
| 2214 | |
| 2215 | |
| 2216 | /* |
| 2217 | * handle mds notification that our request has been forwarded. |
| 2218 | */ |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2219 | static void handle_forward(struct ceph_mds_client *mdsc, |
| 2220 | struct ceph_mds_session *session, |
| 2221 | struct ceph_msg *msg) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2222 | { |
| 2223 | struct ceph_mds_request *req; |
Sage Weil | a1ea787 | 2010-02-23 14:02:44 -0800 | [diff] [blame] | 2224 | u64 tid = le64_to_cpu(msg->hdr.tid); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2225 | u32 next_mds; |
| 2226 | u32 fwd_seq; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2227 | int err = -EINVAL; |
| 2228 | void *p = msg->front.iov_base; |
| 2229 | void *end = p + msg->front.iov_len; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2230 | |
Sage Weil | a1ea787 | 2010-02-23 14:02:44 -0800 | [diff] [blame] | 2231 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
Sage Weil | c89136e | 2009-10-14 09:59:09 -0700 | [diff] [blame] | 2232 | next_mds = ceph_decode_32(&p); |
| 2233 | fwd_seq = ceph_decode_32(&p); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2234 | |
| 2235 | mutex_lock(&mdsc->mutex); |
| 2236 | req = __lookup_request(mdsc, tid); |
| 2237 | if (!req) { |
Sage Weil | 2a8e5e3 | 2010-05-28 16:43:16 -0700 | [diff] [blame] | 2238 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2239 | goto out; /* dup reply? */ |
| 2240 | } |
| 2241 | |
Sage Weil | 2a8e5e3 | 2010-05-28 16:43:16 -0700 | [diff] [blame] | 2242 | if (req->r_aborted) { |
| 2243 | dout("forward tid %llu aborted, unregistering\n", tid); |
| 2244 | __unregister_request(mdsc, req); |
| 2245 | } else if (fwd_seq <= req->r_num_fwd) { |
| 2246 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2247 | tid, next_mds, req->r_num_fwd, fwd_seq); |
| 2248 | } else { |
| 2249 | /* resend. forward race not possible; mds would drop */ |
Sage Weil | 2a8e5e3 | 2010-05-28 16:43:16 -0700 | [diff] [blame] | 2250 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
| 2251 | BUG_ON(req->r_err); |
| 2252 | BUG_ON(req->r_got_result); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2253 | req->r_num_fwd = fwd_seq; |
| 2254 | req->r_resend_mds = next_mds; |
| 2255 | put_request_session(req); |
| 2256 | __do_request(mdsc, req); |
| 2257 | } |
| 2258 | ceph_mdsc_put_request(req); |
| 2259 | out: |
| 2260 | mutex_unlock(&mdsc->mutex); |
| 2261 | return; |
| 2262 | |
| 2263 | bad: |
| 2264 | pr_err("mdsc_handle_forward decode error err=%d\n", err); |
| 2265 | } |
| 2266 | |
| 2267 | /* |
| 2268 | * handle a mds session control message |
| 2269 | */ |
| 2270 | static void handle_session(struct ceph_mds_session *session, |
| 2271 | struct ceph_msg *msg) |
| 2272 | { |
| 2273 | struct ceph_mds_client *mdsc = session->s_mdsc; |
| 2274 | u32 op; |
| 2275 | u64 seq; |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2276 | int mds = session->s_mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2277 | struct ceph_mds_session_head *h = msg->front.iov_base; |
| 2278 | int wake = 0; |
| 2279 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2280 | /* decode */ |
| 2281 | if (msg->front.iov_len != sizeof(*h)) |
| 2282 | goto bad; |
| 2283 | op = le32_to_cpu(h->op); |
| 2284 | seq = le64_to_cpu(h->seq); |
| 2285 | |
| 2286 | mutex_lock(&mdsc->mutex); |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2287 | if (op == CEPH_SESSION_CLOSE) |
| 2288 | __unregister_session(mdsc, session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2289 | /* FIXME: this ttl calculation is generous */ |
| 2290 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; |
| 2291 | mutex_unlock(&mdsc->mutex); |
| 2292 | |
| 2293 | mutex_lock(&session->s_mutex); |
| 2294 | |
| 2295 | dout("handle_session mds%d %s %p state %s seq %llu\n", |
| 2296 | mds, ceph_session_op_name(op), session, |
| 2297 | session_state_name(session->s_state), seq); |
| 2298 | |
| 2299 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { |
| 2300 | session->s_state = CEPH_MDS_SESSION_OPEN; |
| 2301 | pr_info("mds%d came back\n", session->s_mds); |
| 2302 | } |
| 2303 | |
| 2304 | switch (op) { |
| 2305 | case CEPH_SESSION_OPEN: |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2306 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
| 2307 | pr_info("mds%d reconnect success\n", session->s_mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2308 | session->s_state = CEPH_MDS_SESSION_OPEN; |
| 2309 | renewed_caps(mdsc, session, 0); |
| 2310 | wake = 1; |
| 2311 | if (mdsc->stopping) |
| 2312 | __close_session(mdsc, session); |
| 2313 | break; |
| 2314 | |
| 2315 | case CEPH_SESSION_RENEWCAPS: |
| 2316 | if (session->s_renew_seq == seq) |
| 2317 | renewed_caps(mdsc, session, 1); |
| 2318 | break; |
| 2319 | |
| 2320 | case CEPH_SESSION_CLOSE: |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2321 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
| 2322 | pr_info("mds%d reconnect denied\n", session->s_mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2323 | remove_session_caps(session); |
| 2324 | wake = 1; /* for good measure */ |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 2325 | wake_up_all(&mdsc->session_close_wq); |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2326 | kick_requests(mdsc, mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2327 | break; |
| 2328 | |
| 2329 | case CEPH_SESSION_STALE: |
| 2330 | pr_info("mds%d caps went stale, renewing\n", |
| 2331 | session->s_mds); |
Alex Elder | d8fb02a | 2012-01-12 17:48:10 -0800 | [diff] [blame] | 2332 | spin_lock(&session->s_gen_ttl_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2333 | session->s_cap_gen++; |
Alex Elder | 1ce208a | 2012-01-12 17:48:11 -0800 | [diff] [blame] | 2334 | session->s_cap_ttl = jiffies - 1; |
Alex Elder | d8fb02a | 2012-01-12 17:48:10 -0800 | [diff] [blame] | 2335 | spin_unlock(&session->s_gen_ttl_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2336 | send_renew_caps(mdsc, session); |
| 2337 | break; |
| 2338 | |
| 2339 | case CEPH_SESSION_RECALL_STATE: |
| 2340 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); |
| 2341 | break; |
| 2342 | |
| 2343 | default: |
| 2344 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); |
| 2345 | WARN_ON(1); |
| 2346 | } |
| 2347 | |
| 2348 | mutex_unlock(&session->s_mutex); |
| 2349 | if (wake) { |
| 2350 | mutex_lock(&mdsc->mutex); |
| 2351 | __wake_requests(mdsc, &session->s_waiting); |
| 2352 | mutex_unlock(&mdsc->mutex); |
| 2353 | } |
| 2354 | return; |
| 2355 | |
| 2356 | bad: |
| 2357 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, |
| 2358 | (int)msg->front.iov_len); |
Sage Weil | 9ec7cab | 2009-12-14 15:13:47 -0800 | [diff] [blame] | 2359 | ceph_msg_dump(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2360 | return; |
| 2361 | } |
| 2362 | |
| 2363 | |
| 2364 | /* |
| 2365 | * called under session->mutex. |
| 2366 | */ |
| 2367 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, |
| 2368 | struct ceph_mds_session *session) |
| 2369 | { |
| 2370 | struct ceph_mds_request *req, *nreq; |
| 2371 | int err; |
| 2372 | |
| 2373 | dout("replay_unsafe_requests mds%d\n", session->s_mds); |
| 2374 | |
| 2375 | mutex_lock(&mdsc->mutex); |
| 2376 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { |
| 2377 | err = __prepare_send_request(mdsc, req, session->s_mds); |
| 2378 | if (!err) { |
| 2379 | ceph_msg_get(req->r_request); |
| 2380 | ceph_con_send(&session->s_con, req->r_request); |
| 2381 | } |
| 2382 | } |
| 2383 | mutex_unlock(&mdsc->mutex); |
| 2384 | } |
| 2385 | |
| 2386 | /* |
| 2387 | * Encode information about a cap for a reconnect with the MDS. |
| 2388 | */ |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2389 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
| 2390 | void *arg) |
| 2391 | { |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2392 | union { |
| 2393 | struct ceph_mds_cap_reconnect v2; |
| 2394 | struct ceph_mds_cap_reconnect_v1 v1; |
| 2395 | } rec; |
| 2396 | size_t reclen; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2397 | struct ceph_inode_info *ci; |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2398 | struct ceph_reconnect_state *recon_state = arg; |
| 2399 | struct ceph_pagelist *pagelist = recon_state->pagelist; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2400 | char *path; |
| 2401 | int pathlen, err; |
| 2402 | u64 pathbase; |
| 2403 | struct dentry *dentry; |
| 2404 | |
| 2405 | ci = cap->ci; |
| 2406 | |
| 2407 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", |
| 2408 | inode, ceph_vinop(inode), cap, cap->cap_id, |
| 2409 | ceph_cap_string(cap->issued)); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2410 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
| 2411 | if (err) |
| 2412 | return err; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2413 | |
| 2414 | dentry = d_find_alias(inode); |
| 2415 | if (dentry) { |
| 2416 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); |
| 2417 | if (IS_ERR(path)) { |
| 2418 | err = PTR_ERR(path); |
Sage Weil | e072f8a | 2010-08-26 09:26:37 -0700 | [diff] [blame] | 2419 | goto out_dput; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2420 | } |
| 2421 | } else { |
| 2422 | path = NULL; |
| 2423 | pathlen = 0; |
| 2424 | } |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2425 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
| 2426 | if (err) |
Sage Weil | e072f8a | 2010-08-26 09:26:37 -0700 | [diff] [blame] | 2427 | goto out_free; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2428 | |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 2429 | spin_lock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2430 | cap->seq = 0; /* reset cap seq */ |
| 2431 | cap->issue_seq = 0; /* and issue_seq */ |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2432 | |
| 2433 | if (recon_state->flock) { |
| 2434 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); |
| 2435 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); |
| 2436 | rec.v2.issued = cpu_to_le32(cap->issued); |
| 2437 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); |
| 2438 | rec.v2.pathbase = cpu_to_le64(pathbase); |
| 2439 | rec.v2.flock_len = 0; |
| 2440 | reclen = sizeof(rec.v2); |
| 2441 | } else { |
| 2442 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); |
| 2443 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); |
| 2444 | rec.v1.issued = cpu_to_le32(cap->issued); |
| 2445 | rec.v1.size = cpu_to_le64(inode->i_size); |
| 2446 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); |
| 2447 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); |
| 2448 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); |
| 2449 | rec.v1.pathbase = cpu_to_le64(pathbase); |
| 2450 | reclen = sizeof(rec.v1); |
| 2451 | } |
Sage Weil | be65559 | 2011-11-30 09:47:09 -0800 | [diff] [blame] | 2452 | spin_unlock(&ci->i_ceph_lock); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2453 | |
Greg Farnum | 40819f6 | 2010-08-02 15:34:23 -0700 | [diff] [blame] | 2454 | if (recon_state->flock) { |
| 2455 | int num_fcntl_locks, num_flock_locks; |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2456 | struct ceph_pagelist_cursor trunc_point; |
Greg Farnum | 40819f6 | 2010-08-02 15:34:23 -0700 | [diff] [blame] | 2457 | |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2458 | ceph_pagelist_set_cursor(pagelist, &trunc_point); |
| 2459 | do { |
Sage Weil | 496e595 | 2010-09-22 19:57:10 -0700 | [diff] [blame] | 2460 | lock_flocks(); |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2461 | ceph_count_locks(inode, &num_fcntl_locks, |
| 2462 | &num_flock_locks); |
| 2463 | rec.v2.flock_len = (2*sizeof(u32) + |
| 2464 | (num_fcntl_locks+num_flock_locks) * |
| 2465 | sizeof(struct ceph_filelock)); |
Sage Weil | 496e595 | 2010-09-22 19:57:10 -0700 | [diff] [blame] | 2466 | unlock_flocks(); |
Greg Farnum | 40819f6 | 2010-08-02 15:34:23 -0700 | [diff] [blame] | 2467 | |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2468 | /* pre-alloc pagelist */ |
| 2469 | ceph_pagelist_truncate(pagelist, &trunc_point); |
| 2470 | err = ceph_pagelist_append(pagelist, &rec, reclen); |
| 2471 | if (!err) |
| 2472 | err = ceph_pagelist_reserve(pagelist, |
| 2473 | rec.v2.flock_len); |
| 2474 | |
| 2475 | /* encode locks */ |
| 2476 | if (!err) { |
Sage Weil | 496e595 | 2010-09-22 19:57:10 -0700 | [diff] [blame] | 2477 | lock_flocks(); |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2478 | err = ceph_encode_locks(inode, |
| 2479 | pagelist, |
| 2480 | num_fcntl_locks, |
| 2481 | num_flock_locks); |
Sage Weil | 496e595 | 2010-09-22 19:57:10 -0700 | [diff] [blame] | 2482 | unlock_flocks(); |
Greg Farnum | fca4451 | 2010-09-17 10:24:02 -0700 | [diff] [blame] | 2483 | } |
| 2484 | } while (err == -ENOSPC); |
Sage Weil | 3612abb | 2010-09-07 15:59:27 -0700 | [diff] [blame] | 2485 | } else { |
| 2486 | err = ceph_pagelist_append(pagelist, &rec, reclen); |
Greg Farnum | 40819f6 | 2010-08-02 15:34:23 -0700 | [diff] [blame] | 2487 | } |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2488 | |
Sage Weil | e072f8a | 2010-08-26 09:26:37 -0700 | [diff] [blame] | 2489 | out_free: |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2490 | kfree(path); |
Sage Weil | e072f8a | 2010-08-26 09:26:37 -0700 | [diff] [blame] | 2491 | out_dput: |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2492 | dput(dentry); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2493 | return err; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2494 | } |
| 2495 | |
| 2496 | |
| 2497 | /* |
| 2498 | * If an MDS fails and recovers, clients need to reconnect in order to |
| 2499 | * reestablish shared state. This includes all caps issued through |
| 2500 | * this session _and_ the snap_realm hierarchy. Because it's not |
| 2501 | * clear which snap realms the mds cares about, we send everything we |
| 2502 | * know about.. that ensures we'll then get any new info the |
| 2503 | * recovering MDS might have. |
| 2504 | * |
| 2505 | * This is a relatively heavyweight operation, but it's rare. |
| 2506 | * |
| 2507 | * called with mdsc->mutex held. |
| 2508 | */ |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2509 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
| 2510 | struct ceph_mds_session *session) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2511 | { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2512 | struct ceph_msg *reply; |
Sage Weil | a105f00 | 2010-02-15 14:37:55 -0800 | [diff] [blame] | 2513 | struct rb_node *p; |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2514 | int mds = session->s_mds; |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2515 | int err = -ENOMEM; |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2516 | struct ceph_pagelist *pagelist; |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2517 | struct ceph_reconnect_state recon_state; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2518 | |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2519 | pr_info("mds%d reconnect start\n", mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2520 | |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2521 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
| 2522 | if (!pagelist) |
| 2523 | goto fail_nopagelist; |
| 2524 | ceph_pagelist_init(pagelist); |
| 2525 | |
Sage Weil | b61c276 | 2011-08-09 15:03:46 -0700 | [diff] [blame] | 2526 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 2527 | if (!reply) |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2528 | goto fail_nomsg; |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2529 | |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2530 | mutex_lock(&session->s_mutex); |
| 2531 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; |
| 2532 | session->s_seq = 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2533 | |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2534 | ceph_con_open(&session->s_con, |
| 2535 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2536 | |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2537 | /* replay unsafe requests */ |
| 2538 | replay_unsafe_requests(mdsc, session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2539 | |
| 2540 | down_read(&mdsc->snap_rwsem); |
| 2541 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2542 | dout("session %p state %s\n", session, |
| 2543 | session_state_name(session->s_state)); |
| 2544 | |
Sage Weil | e01a594 | 2010-05-10 15:36:44 -0700 | [diff] [blame] | 2545 | /* drop old cap expires; we're about to reestablish that state */ |
| 2546 | discard_cap_releases(mdsc, session); |
| 2547 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2548 | /* traverse this session's caps */ |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2549 | err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps); |
| 2550 | if (err) |
| 2551 | goto fail; |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2552 | |
| 2553 | recon_state.pagelist = pagelist; |
| 2554 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; |
| 2555 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2556 | if (err < 0) |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2557 | goto fail; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2558 | |
| 2559 | /* |
| 2560 | * snaprealms. we provide mds with the ino, seq (version), and |
| 2561 | * parent for all of our realms. If the mds has any newer info, |
| 2562 | * it will tell us. |
| 2563 | */ |
Sage Weil | a105f00 | 2010-02-15 14:37:55 -0800 | [diff] [blame] | 2564 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
| 2565 | struct ceph_snap_realm *realm = |
| 2566 | rb_entry(p, struct ceph_snap_realm, node); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2567 | struct ceph_mds_snaprealm_reconnect sr_rec; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2568 | |
| 2569 | dout(" adding snap realm %llx seq %lld parent %llx\n", |
| 2570 | realm->ino, realm->seq, realm->parent_ino); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2571 | sr_rec.ino = cpu_to_le64(realm->ino); |
| 2572 | sr_rec.seq = cpu_to_le64(realm->seq); |
| 2573 | sr_rec.parent = cpu_to_le64(realm->parent_ino); |
| 2574 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); |
| 2575 | if (err) |
| 2576 | goto fail; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2577 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2578 | |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2579 | reply->pagelist = pagelist; |
Sage Weil | 20cb34a | 2010-05-12 15:21:32 -0700 | [diff] [blame] | 2580 | if (recon_state.flock) |
| 2581 | reply->hdr.version = cpu_to_le16(2); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2582 | reply->hdr.data_len = cpu_to_le32(pagelist->length); |
| 2583 | reply->nr_pages = calc_pages_for(0, pagelist->length); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2584 | ceph_con_send(&session->s_con, reply); |
| 2585 | |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2586 | mutex_unlock(&session->s_mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2587 | |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2588 | mutex_lock(&mdsc->mutex); |
| 2589 | __wake_requests(mdsc, &session->s_waiting); |
| 2590 | mutex_unlock(&mdsc->mutex); |
| 2591 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2592 | up_read(&mdsc->snap_rwsem); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2593 | return; |
| 2594 | |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2595 | fail: |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2596 | ceph_msg_put(reply); |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2597 | up_read(&mdsc->snap_rwsem); |
| 2598 | mutex_unlock(&session->s_mutex); |
Sage Weil | 93cea5b | 2009-12-23 12:21:51 -0800 | [diff] [blame] | 2599 | fail_nomsg: |
| 2600 | ceph_pagelist_release(pagelist); |
| 2601 | kfree(pagelist); |
| 2602 | fail_nopagelist: |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2603 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
Sage Weil | 9abf82b | 2010-05-10 21:58:38 -0700 | [diff] [blame] | 2604 | return; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2605 | } |
| 2606 | |
| 2607 | |
| 2608 | /* |
| 2609 | * compare old and new mdsmaps, kicking requests |
| 2610 | * and closing out old connections as necessary |
| 2611 | * |
| 2612 | * called under mdsc->mutex. |
| 2613 | */ |
| 2614 | static void check_new_map(struct ceph_mds_client *mdsc, |
| 2615 | struct ceph_mdsmap *newmap, |
| 2616 | struct ceph_mdsmap *oldmap) |
| 2617 | { |
| 2618 | int i; |
| 2619 | int oldstate, newstate; |
| 2620 | struct ceph_mds_session *s; |
| 2621 | |
| 2622 | dout("check_new_map new %u old %u\n", |
| 2623 | newmap->m_epoch, oldmap->m_epoch); |
| 2624 | |
| 2625 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { |
| 2626 | if (mdsc->sessions[i] == NULL) |
| 2627 | continue; |
| 2628 | s = mdsc->sessions[i]; |
| 2629 | oldstate = ceph_mdsmap_get_state(oldmap, i); |
| 2630 | newstate = ceph_mdsmap_get_state(newmap, i); |
| 2631 | |
Sage Weil | 0deb01c | 2010-06-17 14:19:01 -0700 | [diff] [blame] | 2632 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2633 | i, ceph_mds_state_name(oldstate), |
Sage Weil | 0deb01c | 2010-06-17 14:19:01 -0700 | [diff] [blame] | 2634 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2635 | ceph_mds_state_name(newstate), |
Sage Weil | 0deb01c | 2010-06-17 14:19:01 -0700 | [diff] [blame] | 2636 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2637 | session_state_name(s->s_state)); |
| 2638 | |
| 2639 | if (memcmp(ceph_mdsmap_get_addr(oldmap, i), |
| 2640 | ceph_mdsmap_get_addr(newmap, i), |
| 2641 | sizeof(struct ceph_entity_addr))) { |
| 2642 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { |
| 2643 | /* the session never opened, just close it |
| 2644 | * out now */ |
| 2645 | __wake_requests(mdsc, &s->s_waiting); |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2646 | __unregister_session(mdsc, s); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2647 | } else { |
| 2648 | /* just close it */ |
| 2649 | mutex_unlock(&mdsc->mutex); |
| 2650 | mutex_lock(&s->s_mutex); |
| 2651 | mutex_lock(&mdsc->mutex); |
| 2652 | ceph_con_close(&s->s_con); |
| 2653 | mutex_unlock(&s->s_mutex); |
| 2654 | s->s_state = CEPH_MDS_SESSION_RESTARTING; |
| 2655 | } |
| 2656 | |
| 2657 | /* kick any requests waiting on the recovering mds */ |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2658 | kick_requests(mdsc, i); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2659 | } else if (oldstate == newstate) { |
| 2660 | continue; /* nothing new with this mds */ |
| 2661 | } |
| 2662 | |
| 2663 | /* |
| 2664 | * send reconnect? |
| 2665 | */ |
| 2666 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && |
Sage Weil | 34b6c85 | 2010-05-10 16:31:25 -0700 | [diff] [blame] | 2667 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
| 2668 | mutex_unlock(&mdsc->mutex); |
| 2669 | send_mds_reconnect(mdsc, s); |
| 2670 | mutex_lock(&mdsc->mutex); |
| 2671 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2672 | |
| 2673 | /* |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2674 | * kick request on any mds that has gone active. |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2675 | */ |
| 2676 | if (oldstate < CEPH_MDS_STATE_ACTIVE && |
| 2677 | newstate >= CEPH_MDS_STATE_ACTIVE) { |
Sage Weil | 29790f2 | 2010-03-18 14:45:05 -0700 | [diff] [blame] | 2678 | if (oldstate != CEPH_MDS_STATE_CREATING && |
| 2679 | oldstate != CEPH_MDS_STATE_STARTING) |
| 2680 | pr_info("mds%d recovery completed\n", s->s_mds); |
| 2681 | kick_requests(mdsc, i); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2682 | ceph_kick_flushing_caps(mdsc, s); |
Sage Weil | 0dc2570 | 2009-11-20 13:43:45 -0800 | [diff] [blame] | 2683 | wake_up_session_caps(s, 1); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2684 | } |
| 2685 | } |
Sage Weil | cb170a2 | 2010-06-21 13:38:35 -0700 | [diff] [blame] | 2686 | |
| 2687 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { |
| 2688 | s = mdsc->sessions[i]; |
| 2689 | if (!s) |
| 2690 | continue; |
| 2691 | if (!ceph_mdsmap_is_laggy(newmap, i)) |
| 2692 | continue; |
| 2693 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
| 2694 | s->s_state == CEPH_MDS_SESSION_HUNG || |
| 2695 | s->s_state == CEPH_MDS_SESSION_CLOSING) { |
| 2696 | dout(" connecting to export targets of laggy mds%d\n", |
| 2697 | i); |
| 2698 | __open_export_target_sessions(mdsc, s); |
| 2699 | } |
| 2700 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2701 | } |
| 2702 | |
| 2703 | |
| 2704 | |
| 2705 | /* |
| 2706 | * leases |
| 2707 | */ |
| 2708 | |
| 2709 | /* |
| 2710 | * caller must hold session s_mutex, dentry->d_lock |
| 2711 | */ |
| 2712 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) |
| 2713 | { |
| 2714 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
| 2715 | |
| 2716 | ceph_put_mds_session(di->lease_session); |
| 2717 | di->lease_session = NULL; |
| 2718 | } |
| 2719 | |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2720 | static void handle_lease(struct ceph_mds_client *mdsc, |
| 2721 | struct ceph_mds_session *session, |
| 2722 | struct ceph_msg *msg) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2723 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 2724 | struct super_block *sb = mdsc->fsc->sb; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2725 | struct inode *inode; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2726 | struct dentry *parent, *dentry; |
| 2727 | struct ceph_dentry_info *di; |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 2728 | int mds = session->s_mds; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2729 | struct ceph_mds_lease *h = msg->front.iov_base; |
Sage Weil | 1e5ea23 | 2010-06-04 10:05:40 -0700 | [diff] [blame] | 2730 | u32 seq; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2731 | struct ceph_vino vino; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2732 | struct qstr dname; |
| 2733 | int release = 0; |
| 2734 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2735 | dout("handle_lease from mds%d\n", mds); |
| 2736 | |
| 2737 | /* decode */ |
| 2738 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) |
| 2739 | goto bad; |
| 2740 | vino.ino = le64_to_cpu(h->ino); |
| 2741 | vino.snap = CEPH_NOSNAP; |
Sage Weil | 1e5ea23 | 2010-06-04 10:05:40 -0700 | [diff] [blame] | 2742 | seq = le32_to_cpu(h->seq); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2743 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
| 2744 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); |
| 2745 | if (dname.len != get_unaligned_le32(h+1)) |
| 2746 | goto bad; |
| 2747 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2748 | mutex_lock(&session->s_mutex); |
| 2749 | session->s_seq++; |
| 2750 | |
| 2751 | /* lookup inode */ |
| 2752 | inode = ceph_find_inode(sb, vino); |
Sage Weil | 2f90b85 | 2011-07-26 11:28:25 -0700 | [diff] [blame] | 2753 | dout("handle_lease %s, ino %llx %p %.*s\n", |
| 2754 | ceph_lease_op_name(h->action), vino.ino, inode, |
Sage Weil | 1e5ea23 | 2010-06-04 10:05:40 -0700 | [diff] [blame] | 2755 | dname.len, dname.name); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2756 | if (inode == NULL) { |
| 2757 | dout("handle_lease no inode %llx\n", vino.ino); |
| 2758 | goto release; |
| 2759 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2760 | |
| 2761 | /* dentry */ |
| 2762 | parent = d_find_alias(inode); |
| 2763 | if (!parent) { |
| 2764 | dout("no parent dentry on inode %p\n", inode); |
| 2765 | WARN_ON(1); |
| 2766 | goto release; /* hrm... */ |
| 2767 | } |
| 2768 | dname.hash = full_name_hash(dname.name, dname.len); |
| 2769 | dentry = d_lookup(parent, &dname); |
| 2770 | dput(parent); |
| 2771 | if (!dentry) |
| 2772 | goto release; |
| 2773 | |
| 2774 | spin_lock(&dentry->d_lock); |
| 2775 | di = ceph_dentry(dentry); |
| 2776 | switch (h->action) { |
| 2777 | case CEPH_MDS_LEASE_REVOKE: |
Sage Weil | 3d8eb7a | 2011-11-11 09:48:53 -0800 | [diff] [blame] | 2778 | if (di->lease_session == session) { |
Sage Weil | 1e5ea23 | 2010-06-04 10:05:40 -0700 | [diff] [blame] | 2779 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
| 2780 | h->seq = cpu_to_le32(di->lease_seq); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2781 | __ceph_mdsc_drop_dentry_lease(dentry); |
| 2782 | } |
| 2783 | release = 1; |
| 2784 | break; |
| 2785 | |
| 2786 | case CEPH_MDS_LEASE_RENEW: |
Sage Weil | 3d8eb7a | 2011-11-11 09:48:53 -0800 | [diff] [blame] | 2787 | if (di->lease_session == session && |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2788 | di->lease_gen == session->s_cap_gen && |
| 2789 | di->lease_renew_from && |
| 2790 | di->lease_renew_after == 0) { |
| 2791 | unsigned long duration = |
| 2792 | le32_to_cpu(h->duration_ms) * HZ / 1000; |
| 2793 | |
Sage Weil | 1e5ea23 | 2010-06-04 10:05:40 -0700 | [diff] [blame] | 2794 | di->lease_seq = seq; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2795 | dentry->d_time = di->lease_renew_from + duration; |
| 2796 | di->lease_renew_after = di->lease_renew_from + |
| 2797 | (duration >> 1); |
| 2798 | di->lease_renew_from = 0; |
| 2799 | } |
| 2800 | break; |
| 2801 | } |
| 2802 | spin_unlock(&dentry->d_lock); |
| 2803 | dput(dentry); |
| 2804 | |
| 2805 | if (!release) |
| 2806 | goto out; |
| 2807 | |
| 2808 | release: |
| 2809 | /* let's just reuse the same message */ |
| 2810 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; |
| 2811 | ceph_msg_get(msg); |
| 2812 | ceph_con_send(&session->s_con, msg); |
| 2813 | |
| 2814 | out: |
| 2815 | iput(inode); |
| 2816 | mutex_unlock(&session->s_mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2817 | return; |
| 2818 | |
| 2819 | bad: |
| 2820 | pr_err("corrupt lease message\n"); |
Sage Weil | 9ec7cab | 2009-12-14 15:13:47 -0800 | [diff] [blame] | 2821 | ceph_msg_dump(msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2822 | } |
| 2823 | |
| 2824 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, |
| 2825 | struct inode *inode, |
| 2826 | struct dentry *dentry, char action, |
| 2827 | u32 seq) |
| 2828 | { |
| 2829 | struct ceph_msg *msg; |
| 2830 | struct ceph_mds_lease *lease; |
| 2831 | int len = sizeof(*lease) + sizeof(u32); |
| 2832 | int dnamelen = 0; |
| 2833 | |
| 2834 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", |
| 2835 | inode, dentry, ceph_lease_op_name(action), session->s_mds); |
| 2836 | dnamelen = dentry->d_name.len; |
| 2837 | len += dnamelen; |
| 2838 | |
Sage Weil | b61c276 | 2011-08-09 15:03:46 -0700 | [diff] [blame] | 2839 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
Sage Weil | a79832f | 2010-04-01 16:06:19 -0700 | [diff] [blame] | 2840 | if (!msg) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2841 | return; |
| 2842 | lease = msg->front.iov_base; |
| 2843 | lease->action = action; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2844 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
| 2845 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); |
| 2846 | lease->seq = cpu_to_le32(seq); |
| 2847 | put_unaligned_le32(dnamelen, lease + 1); |
| 2848 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); |
| 2849 | |
| 2850 | /* |
| 2851 | * if this is a preemptive lease RELEASE, no need to |
| 2852 | * flush request stream, since the actual request will |
| 2853 | * soon follow. |
| 2854 | */ |
| 2855 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); |
| 2856 | |
| 2857 | ceph_con_send(&session->s_con, msg); |
| 2858 | } |
| 2859 | |
| 2860 | /* |
| 2861 | * Preemptively release a lease we expect to invalidate anyway. |
| 2862 | * Pass @inode always, @dentry is optional. |
| 2863 | */ |
| 2864 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, |
Sage Weil | 2f90b85 | 2011-07-26 11:28:25 -0700 | [diff] [blame] | 2865 | struct dentry *dentry) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2866 | { |
| 2867 | struct ceph_dentry_info *di; |
| 2868 | struct ceph_mds_session *session; |
| 2869 | u32 seq; |
| 2870 | |
| 2871 | BUG_ON(inode == NULL); |
| 2872 | BUG_ON(dentry == NULL); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2873 | |
| 2874 | /* is dentry lease valid? */ |
| 2875 | spin_lock(&dentry->d_lock); |
| 2876 | di = ceph_dentry(dentry); |
| 2877 | if (!di || !di->lease_session || |
| 2878 | di->lease_session->s_mds < 0 || |
| 2879 | di->lease_gen != di->lease_session->s_cap_gen || |
| 2880 | !time_before(jiffies, dentry->d_time)) { |
| 2881 | dout("lease_release inode %p dentry %p -- " |
Sage Weil | 2f90b85 | 2011-07-26 11:28:25 -0700 | [diff] [blame] | 2882 | "no lease\n", |
| 2883 | inode, dentry); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2884 | spin_unlock(&dentry->d_lock); |
| 2885 | return; |
| 2886 | } |
| 2887 | |
| 2888 | /* we do have a lease on this dentry; note mds and seq */ |
| 2889 | session = ceph_get_mds_session(di->lease_session); |
| 2890 | seq = di->lease_seq; |
| 2891 | __ceph_mdsc_drop_dentry_lease(dentry); |
| 2892 | spin_unlock(&dentry->d_lock); |
| 2893 | |
Sage Weil | 2f90b85 | 2011-07-26 11:28:25 -0700 | [diff] [blame] | 2894 | dout("lease_release inode %p dentry %p to mds%d\n", |
| 2895 | inode, dentry, session->s_mds); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2896 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
| 2897 | CEPH_MDS_LEASE_RELEASE, seq); |
| 2898 | ceph_put_mds_session(session); |
| 2899 | } |
| 2900 | |
| 2901 | /* |
| 2902 | * drop all leases (and dentry refs) in preparation for umount |
| 2903 | */ |
| 2904 | static void drop_leases(struct ceph_mds_client *mdsc) |
| 2905 | { |
| 2906 | int i; |
| 2907 | |
| 2908 | dout("drop_leases\n"); |
| 2909 | mutex_lock(&mdsc->mutex); |
| 2910 | for (i = 0; i < mdsc->max_sessions; i++) { |
| 2911 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); |
| 2912 | if (!s) |
| 2913 | continue; |
| 2914 | mutex_unlock(&mdsc->mutex); |
| 2915 | mutex_lock(&s->s_mutex); |
| 2916 | mutex_unlock(&s->s_mutex); |
| 2917 | ceph_put_mds_session(s); |
| 2918 | mutex_lock(&mdsc->mutex); |
| 2919 | } |
| 2920 | mutex_unlock(&mdsc->mutex); |
| 2921 | } |
| 2922 | |
| 2923 | |
| 2924 | |
| 2925 | /* |
| 2926 | * delayed work -- periodically trim expired leases, renew caps with mds |
| 2927 | */ |
| 2928 | static void schedule_delayed(struct ceph_mds_client *mdsc) |
| 2929 | { |
| 2930 | int delay = 5; |
| 2931 | unsigned hz = round_jiffies_relative(HZ * delay); |
| 2932 | schedule_delayed_work(&mdsc->delayed_work, hz); |
| 2933 | } |
| 2934 | |
| 2935 | static void delayed_work(struct work_struct *work) |
| 2936 | { |
| 2937 | int i; |
| 2938 | struct ceph_mds_client *mdsc = |
| 2939 | container_of(work, struct ceph_mds_client, delayed_work.work); |
| 2940 | int renew_interval; |
| 2941 | int renew_caps; |
| 2942 | |
| 2943 | dout("mdsc delayed_work\n"); |
Sage Weil | afcdaea | 2009-10-14 14:27:38 -0700 | [diff] [blame] | 2944 | ceph_check_delayed_caps(mdsc); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2945 | |
| 2946 | mutex_lock(&mdsc->mutex); |
| 2947 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; |
| 2948 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + |
| 2949 | mdsc->last_renew_caps); |
| 2950 | if (renew_caps) |
| 2951 | mdsc->last_renew_caps = jiffies; |
| 2952 | |
| 2953 | for (i = 0; i < mdsc->max_sessions; i++) { |
| 2954 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); |
| 2955 | if (s == NULL) |
| 2956 | continue; |
| 2957 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { |
| 2958 | dout("resending session close request for mds%d\n", |
| 2959 | s->s_mds); |
| 2960 | request_close_session(mdsc, s); |
| 2961 | ceph_put_mds_session(s); |
| 2962 | continue; |
| 2963 | } |
| 2964 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { |
| 2965 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { |
| 2966 | s->s_state = CEPH_MDS_SESSION_HUNG; |
| 2967 | pr_info("mds%d hung\n", s->s_mds); |
| 2968 | } |
| 2969 | } |
| 2970 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { |
| 2971 | /* this mds is failed or recovering, just wait */ |
| 2972 | ceph_put_mds_session(s); |
| 2973 | continue; |
| 2974 | } |
| 2975 | mutex_unlock(&mdsc->mutex); |
| 2976 | |
| 2977 | mutex_lock(&s->s_mutex); |
| 2978 | if (renew_caps) |
| 2979 | send_renew_caps(mdsc, s); |
| 2980 | else |
| 2981 | ceph_con_keepalive(&s->s_con); |
Sage Weil | ee6b272 | 2010-06-10 12:55:52 -0700 | [diff] [blame] | 2982 | ceph_add_cap_releases(mdsc, s); |
Sage Weil | aab53dd | 2010-03-17 16:30:21 -0700 | [diff] [blame] | 2983 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
| 2984 | s->s_state == CEPH_MDS_SESSION_HUNG) |
Sage Weil | 3d7ded4 | 2010-06-09 16:47:10 -0700 | [diff] [blame] | 2985 | ceph_send_cap_releases(mdsc, s); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2986 | mutex_unlock(&s->s_mutex); |
| 2987 | ceph_put_mds_session(s); |
| 2988 | |
| 2989 | mutex_lock(&mdsc->mutex); |
| 2990 | } |
| 2991 | mutex_unlock(&mdsc->mutex); |
| 2992 | |
| 2993 | schedule_delayed(mdsc); |
| 2994 | } |
| 2995 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 2996 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2997 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 2998 | { |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 2999 | struct ceph_mds_client *mdsc; |
| 3000 | |
| 3001 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); |
| 3002 | if (!mdsc) |
| 3003 | return -ENOMEM; |
| 3004 | mdsc->fsc = fsc; |
| 3005 | fsc->mdsc = mdsc; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3006 | mutex_init(&mdsc->mutex); |
| 3007 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); |
Cheng Renquan | 2d06eeb | 2010-03-26 18:04:40 +0800 | [diff] [blame] | 3008 | if (mdsc->mdsmap == NULL) |
| 3009 | return -ENOMEM; |
| 3010 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3011 | init_completion(&mdsc->safe_umount_waiters); |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3012 | init_waitqueue_head(&mdsc->session_close_wq); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3013 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
| 3014 | mdsc->sessions = NULL; |
| 3015 | mdsc->max_sessions = 0; |
| 3016 | mdsc->stopping = 0; |
| 3017 | init_rwsem(&mdsc->snap_rwsem); |
Sage Weil | a105f00 | 2010-02-15 14:37:55 -0800 | [diff] [blame] | 3018 | mdsc->snap_realms = RB_ROOT; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3019 | INIT_LIST_HEAD(&mdsc->snap_empty); |
| 3020 | spin_lock_init(&mdsc->snap_empty_lock); |
| 3021 | mdsc->last_tid = 0; |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3022 | mdsc->request_tree = RB_ROOT; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3023 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
| 3024 | mdsc->last_renew_caps = jiffies; |
| 3025 | INIT_LIST_HEAD(&mdsc->cap_delay_list); |
| 3026 | spin_lock_init(&mdsc->cap_delay_lock); |
| 3027 | INIT_LIST_HEAD(&mdsc->snap_flush_list); |
| 3028 | spin_lock_init(&mdsc->snap_flush_lock); |
| 3029 | mdsc->cap_flush_seq = 0; |
| 3030 | INIT_LIST_HEAD(&mdsc->cap_dirty); |
Sage Weil | db35405 | 2011-05-24 11:46:31 -0700 | [diff] [blame] | 3031 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3032 | mdsc->num_cap_flushing = 0; |
| 3033 | spin_lock_init(&mdsc->cap_dirty_lock); |
| 3034 | init_waitqueue_head(&mdsc->cap_flushing_wq); |
| 3035 | spin_lock_init(&mdsc->dentry_lru_lock); |
| 3036 | INIT_LIST_HEAD(&mdsc->dentry_lru); |
Cheng Renquan | 2d06eeb | 2010-03-26 18:04:40 +0800 | [diff] [blame] | 3037 | |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 3038 | ceph_caps_init(mdsc); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3039 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 3040 | |
Sage Weil | 5f44f14 | 2009-11-18 14:52:18 -0800 | [diff] [blame] | 3041 | return 0; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3042 | } |
| 3043 | |
| 3044 | /* |
| 3045 | * Wait for safe replies on open mds requests. If we time out, drop |
| 3046 | * all requests from the tree to avoid dangling dentry refs. |
| 3047 | */ |
| 3048 | static void wait_requests(struct ceph_mds_client *mdsc) |
| 3049 | { |
| 3050 | struct ceph_mds_request *req; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3051 | struct ceph_fs_client *fsc = mdsc->fsc; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3052 | |
| 3053 | mutex_lock(&mdsc->mutex); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3054 | if (__get_oldest_req(mdsc)) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3055 | mutex_unlock(&mdsc->mutex); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3056 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3057 | dout("wait_requests waiting for requests\n"); |
| 3058 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3059 | fsc->client->options->mount_timeout * HZ); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3060 | |
| 3061 | /* tear down remaining requests */ |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3062 | mutex_lock(&mdsc->mutex); |
| 3063 | while ((req = __get_oldest_req(mdsc))) { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3064 | dout("wait_requests timed out on tid %llu\n", |
| 3065 | req->r_tid); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3066 | __unregister_request(mdsc, req); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3067 | } |
| 3068 | } |
| 3069 | mutex_unlock(&mdsc->mutex); |
| 3070 | dout("wait_requests done\n"); |
| 3071 | } |
| 3072 | |
| 3073 | /* |
| 3074 | * called before mount is ro, and before dentries are torn down. |
| 3075 | * (hmm, does this still race with new lookups?) |
| 3076 | */ |
| 3077 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) |
| 3078 | { |
| 3079 | dout("pre_umount\n"); |
| 3080 | mdsc->stopping = 1; |
| 3081 | |
| 3082 | drop_leases(mdsc); |
Sage Weil | afcdaea | 2009-10-14 14:27:38 -0700 | [diff] [blame] | 3083 | ceph_flush_dirty_caps(mdsc); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3084 | wait_requests(mdsc); |
Sage Weil | 17c688c | 2010-06-21 16:12:26 -0700 | [diff] [blame] | 3085 | |
| 3086 | /* |
| 3087 | * wait for reply handlers to drop their request refs and |
| 3088 | * their inode/dcache refs |
| 3089 | */ |
| 3090 | ceph_msgr_flush(); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3091 | } |
| 3092 | |
| 3093 | /* |
| 3094 | * wait for all write mds requests to flush. |
| 3095 | */ |
| 3096 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) |
| 3097 | { |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3098 | struct ceph_mds_request *req = NULL, *nextreq; |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3099 | struct rb_node *n; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3100 | |
| 3101 | mutex_lock(&mdsc->mutex); |
| 3102 | dout("wait_unsafe_requests want %lld\n", want_tid); |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3103 | restart: |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3104 | req = __get_oldest_req(mdsc); |
| 3105 | while (req && req->r_tid <= want_tid) { |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3106 | /* find next request */ |
| 3107 | n = rb_next(&req->r_node); |
| 3108 | if (n) |
| 3109 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); |
| 3110 | else |
| 3111 | nextreq = NULL; |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3112 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
| 3113 | /* write op */ |
| 3114 | ceph_mdsc_get_request(req); |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3115 | if (nextreq) |
| 3116 | ceph_mdsc_get_request(nextreq); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3117 | mutex_unlock(&mdsc->mutex); |
| 3118 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", |
| 3119 | req->r_tid, want_tid); |
| 3120 | wait_for_completion(&req->r_safe_completion); |
| 3121 | mutex_lock(&mdsc->mutex); |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3122 | ceph_mdsc_put_request(req); |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3123 | if (!nextreq) |
| 3124 | break; /* next dne before, so we're done! */ |
| 3125 | if (RB_EMPTY_NODE(&nextreq->r_node)) { |
| 3126 | /* next request was removed from tree */ |
| 3127 | ceph_mdsc_put_request(nextreq); |
| 3128 | goto restart; |
| 3129 | } |
| 3130 | ceph_mdsc_put_request(nextreq); /* won't go away */ |
Sage Weil | 44ca18f | 2010-02-15 12:08:46 -0800 | [diff] [blame] | 3131 | } |
Sage Weil | 80fc731 | 2010-03-16 15:28:54 -0700 | [diff] [blame] | 3132 | req = nextreq; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3133 | } |
| 3134 | mutex_unlock(&mdsc->mutex); |
| 3135 | dout("wait_unsafe_requests done\n"); |
| 3136 | } |
| 3137 | |
| 3138 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) |
| 3139 | { |
| 3140 | u64 want_tid, want_flush; |
| 3141 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3142 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
Sage Weil | 56b7cf9 | 2010-05-03 15:22:00 -0700 | [diff] [blame] | 3143 | return; |
| 3144 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3145 | dout("sync\n"); |
| 3146 | mutex_lock(&mdsc->mutex); |
| 3147 | want_tid = mdsc->last_tid; |
| 3148 | want_flush = mdsc->cap_flush_seq; |
| 3149 | mutex_unlock(&mdsc->mutex); |
| 3150 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); |
| 3151 | |
Sage Weil | afcdaea | 2009-10-14 14:27:38 -0700 | [diff] [blame] | 3152 | ceph_flush_dirty_caps(mdsc); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3153 | |
| 3154 | wait_unsafe_requests(mdsc, want_tid); |
| 3155 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); |
| 3156 | } |
| 3157 | |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3158 | /* |
| 3159 | * true if all sessions are closed, or we force unmount |
| 3160 | */ |
H Hartley Sweeten | 7fd7d10 | 2011-09-23 13:22:11 -0700 | [diff] [blame] | 3161 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3162 | { |
| 3163 | int i, n = 0; |
| 3164 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3165 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3166 | return true; |
| 3167 | |
| 3168 | mutex_lock(&mdsc->mutex); |
| 3169 | for (i = 0; i < mdsc->max_sessions; i++) |
| 3170 | if (mdsc->sessions[i]) |
| 3171 | n++; |
| 3172 | mutex_unlock(&mdsc->mutex); |
| 3173 | return n == 0; |
| 3174 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3175 | |
| 3176 | /* |
| 3177 | * called after sb is ro. |
| 3178 | */ |
| 3179 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) |
| 3180 | { |
| 3181 | struct ceph_mds_session *session; |
| 3182 | int i; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3183 | struct ceph_fs_client *fsc = mdsc->fsc; |
| 3184 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3185 | |
| 3186 | dout("close_sessions\n"); |
| 3187 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3188 | /* close sessions */ |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3189 | mutex_lock(&mdsc->mutex); |
| 3190 | for (i = 0; i < mdsc->max_sessions; i++) { |
| 3191 | session = __ceph_lookup_mds_session(mdsc, i); |
| 3192 | if (!session) |
| 3193 | continue; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3194 | mutex_unlock(&mdsc->mutex); |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3195 | mutex_lock(&session->s_mutex); |
| 3196 | __close_session(mdsc, session); |
| 3197 | mutex_unlock(&session->s_mutex); |
| 3198 | ceph_put_mds_session(session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3199 | mutex_lock(&mdsc->mutex); |
| 3200 | } |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3201 | mutex_unlock(&mdsc->mutex); |
| 3202 | |
| 3203 | dout("waiting for sessions to close\n"); |
| 3204 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), |
| 3205 | timeout); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3206 | |
| 3207 | /* tear down remaining sessions */ |
Sage Weil | f3c60c5 | 2010-08-11 14:51:23 -0700 | [diff] [blame] | 3208 | mutex_lock(&mdsc->mutex); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3209 | for (i = 0; i < mdsc->max_sessions; i++) { |
| 3210 | if (mdsc->sessions[i]) { |
| 3211 | session = get_session(mdsc->sessions[i]); |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3212 | __unregister_session(mdsc, session); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3213 | mutex_unlock(&mdsc->mutex); |
| 3214 | mutex_lock(&session->s_mutex); |
| 3215 | remove_session_caps(session); |
| 3216 | mutex_unlock(&session->s_mutex); |
| 3217 | ceph_put_mds_session(session); |
| 3218 | mutex_lock(&mdsc->mutex); |
| 3219 | } |
| 3220 | } |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3221 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3222 | mutex_unlock(&mdsc->mutex); |
| 3223 | |
| 3224 | ceph_cleanup_empty_realms(mdsc); |
| 3225 | |
| 3226 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ |
| 3227 | |
| 3228 | dout("stopped\n"); |
| 3229 | } |
| 3230 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3231 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3232 | { |
| 3233 | dout("stop\n"); |
| 3234 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ |
| 3235 | if (mdsc->mdsmap) |
| 3236 | ceph_mdsmap_destroy(mdsc->mdsmap); |
| 3237 | kfree(mdsc->sessions); |
Yehuda Sadeh | 3715166 | 2010-06-17 16:16:12 -0700 | [diff] [blame] | 3238 | ceph_caps_finalize(mdsc); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3239 | } |
| 3240 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3241 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
| 3242 | { |
| 3243 | struct ceph_mds_client *mdsc = fsc->mdsc; |
| 3244 | |
Sage Weil | ef550f6 | 2011-03-25 13:27:48 -0700 | [diff] [blame] | 3245 | dout("mdsc_destroy %p\n", mdsc); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3246 | ceph_mdsc_stop(mdsc); |
Sage Weil | ef550f6 | 2011-03-25 13:27:48 -0700 | [diff] [blame] | 3247 | |
| 3248 | /* flush out any connection work with references to us */ |
| 3249 | ceph_msgr_flush(); |
| 3250 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3251 | fsc->mdsc = NULL; |
| 3252 | kfree(mdsc); |
Sage Weil | ef550f6 | 2011-03-25 13:27:48 -0700 | [diff] [blame] | 3253 | dout("mdsc_destroy %p done\n", mdsc); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3254 | } |
| 3255 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3256 | |
| 3257 | /* |
| 3258 | * handle mds map update. |
| 3259 | */ |
| 3260 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
| 3261 | { |
| 3262 | u32 epoch; |
| 3263 | u32 maplen; |
| 3264 | void *p = msg->front.iov_base; |
| 3265 | void *end = p + msg->front.iov_len; |
| 3266 | struct ceph_mdsmap *newmap, *oldmap; |
| 3267 | struct ceph_fsid fsid; |
| 3268 | int err = -EINVAL; |
| 3269 | |
| 3270 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); |
| 3271 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3272 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
Sage Weil | 0743304 | 2009-11-18 16:50:41 -0800 | [diff] [blame] | 3273 | return; |
Sage Weil | c89136e | 2009-10-14 09:59:09 -0700 | [diff] [blame] | 3274 | epoch = ceph_decode_32(&p); |
| 3275 | maplen = ceph_decode_32(&p); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3276 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
| 3277 | |
| 3278 | /* do we need it? */ |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3279 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3280 | mutex_lock(&mdsc->mutex); |
| 3281 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { |
| 3282 | dout("handle_map epoch %u <= our %u\n", |
| 3283 | epoch, mdsc->mdsmap->m_epoch); |
| 3284 | mutex_unlock(&mdsc->mutex); |
| 3285 | return; |
| 3286 | } |
| 3287 | |
| 3288 | newmap = ceph_mdsmap_decode(&p, end); |
| 3289 | if (IS_ERR(newmap)) { |
| 3290 | err = PTR_ERR(newmap); |
| 3291 | goto bad_unlock; |
| 3292 | } |
| 3293 | |
| 3294 | /* swap into place */ |
| 3295 | if (mdsc->mdsmap) { |
| 3296 | oldmap = mdsc->mdsmap; |
| 3297 | mdsc->mdsmap = newmap; |
| 3298 | check_new_map(mdsc, newmap, oldmap); |
| 3299 | ceph_mdsmap_destroy(oldmap); |
| 3300 | } else { |
| 3301 | mdsc->mdsmap = newmap; /* first mds map */ |
| 3302 | } |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3303 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3304 | |
| 3305 | __wake_requests(mdsc, &mdsc->waiting_for_map); |
| 3306 | |
| 3307 | mutex_unlock(&mdsc->mutex); |
| 3308 | schedule_delayed(mdsc); |
| 3309 | return; |
| 3310 | |
| 3311 | bad_unlock: |
| 3312 | mutex_unlock(&mdsc->mutex); |
| 3313 | bad: |
| 3314 | pr_err("error decoding mdsmap %d\n", err); |
| 3315 | return; |
| 3316 | } |
| 3317 | |
| 3318 | static struct ceph_connection *con_get(struct ceph_connection *con) |
| 3319 | { |
| 3320 | struct ceph_mds_session *s = con->private; |
| 3321 | |
| 3322 | if (get_session(s)) { |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3323 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3324 | return con; |
| 3325 | } |
| 3326 | dout("mdsc con_get %p FAIL\n", s); |
| 3327 | return NULL; |
| 3328 | } |
| 3329 | |
| 3330 | static void con_put(struct ceph_connection *con) |
| 3331 | { |
| 3332 | struct ceph_mds_session *s = con->private; |
| 3333 | |
Henry C Chang | 7d8e18a | 2011-05-11 10:29:52 +0000 | [diff] [blame] | 3334 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3335 | ceph_put_mds_session(s); |
| 3336 | } |
| 3337 | |
| 3338 | /* |
| 3339 | * if the client is unresponsive for long enough, the mds will kill |
| 3340 | * the session entirely. |
| 3341 | */ |
| 3342 | static void peer_reset(struct ceph_connection *con) |
| 3343 | { |
| 3344 | struct ceph_mds_session *s = con->private; |
Sage Weil | 7e70f0e | 2010-03-18 13:59:12 -0700 | [diff] [blame] | 3345 | struct ceph_mds_client *mdsc = s->s_mdsc; |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3346 | |
Sage Weil | 7e70f0e | 2010-03-18 13:59:12 -0700 | [diff] [blame] | 3347 | pr_warning("mds%d closed our session\n", s->s_mds); |
| 3348 | send_mds_reconnect(mdsc, s); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3349 | } |
| 3350 | |
| 3351 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) |
| 3352 | { |
| 3353 | struct ceph_mds_session *s = con->private; |
| 3354 | struct ceph_mds_client *mdsc = s->s_mdsc; |
| 3355 | int type = le16_to_cpu(msg->hdr.type); |
| 3356 | |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3357 | mutex_lock(&mdsc->mutex); |
| 3358 | if (__verify_registered_session(mdsc, s) < 0) { |
| 3359 | mutex_unlock(&mdsc->mutex); |
| 3360 | goto out; |
| 3361 | } |
| 3362 | mutex_unlock(&mdsc->mutex); |
| 3363 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3364 | switch (type) { |
| 3365 | case CEPH_MSG_MDS_MAP: |
| 3366 | ceph_mdsc_handle_map(mdsc, msg); |
| 3367 | break; |
| 3368 | case CEPH_MSG_CLIENT_SESSION: |
| 3369 | handle_session(s, msg); |
| 3370 | break; |
| 3371 | case CEPH_MSG_CLIENT_REPLY: |
| 3372 | handle_reply(s, msg); |
| 3373 | break; |
| 3374 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3375 | handle_forward(mdsc, s, msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3376 | break; |
| 3377 | case CEPH_MSG_CLIENT_CAPS: |
| 3378 | ceph_handle_caps(s, msg); |
| 3379 | break; |
| 3380 | case CEPH_MSG_CLIENT_SNAP: |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3381 | ceph_handle_snap(mdsc, s, msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3382 | break; |
| 3383 | case CEPH_MSG_CLIENT_LEASE: |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3384 | handle_lease(mdsc, s, msg); |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3385 | break; |
| 3386 | |
| 3387 | default: |
| 3388 | pr_err("received unknown message type %d %s\n", type, |
| 3389 | ceph_msg_type_name(type)); |
| 3390 | } |
Sage Weil | 2600d2d | 2010-02-22 15:12:16 -0800 | [diff] [blame] | 3391 | out: |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3392 | ceph_msg_put(msg); |
| 3393 | } |
| 3394 | |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 3395 | /* |
| 3396 | * authentication |
| 3397 | */ |
| 3398 | static int get_authorizer(struct ceph_connection *con, |
| 3399 | void **buf, int *len, int *proto, |
| 3400 | void **reply_buf, int *reply_len, int force_new) |
| 3401 | { |
| 3402 | struct ceph_mds_session *s = con->private; |
| 3403 | struct ceph_mds_client *mdsc = s->s_mdsc; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3404 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 3405 | int ret = 0; |
| 3406 | |
| 3407 | if (force_new && s->s_authorizer) { |
| 3408 | ac->ops->destroy_authorizer(ac, s->s_authorizer); |
| 3409 | s->s_authorizer = NULL; |
| 3410 | } |
| 3411 | if (s->s_authorizer == NULL) { |
| 3412 | if (ac->ops->create_authorizer) { |
| 3413 | ret = ac->ops->create_authorizer( |
| 3414 | ac, CEPH_ENTITY_TYPE_MDS, |
| 3415 | &s->s_authorizer, |
| 3416 | &s->s_authorizer_buf, |
| 3417 | &s->s_authorizer_buf_len, |
| 3418 | &s->s_authorizer_reply_buf, |
| 3419 | &s->s_authorizer_reply_buf_len); |
| 3420 | if (ret) |
| 3421 | return ret; |
| 3422 | } |
| 3423 | } |
| 3424 | |
| 3425 | *proto = ac->protocol; |
| 3426 | *buf = s->s_authorizer_buf; |
| 3427 | *len = s->s_authorizer_buf_len; |
| 3428 | *reply_buf = s->s_authorizer_reply_buf; |
| 3429 | *reply_len = s->s_authorizer_reply_buf_len; |
| 3430 | return 0; |
| 3431 | } |
| 3432 | |
| 3433 | |
| 3434 | static int verify_authorizer_reply(struct ceph_connection *con, int len) |
| 3435 | { |
| 3436 | struct ceph_mds_session *s = con->private; |
| 3437 | struct ceph_mds_client *mdsc = s->s_mdsc; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3438 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 3439 | |
| 3440 | return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len); |
| 3441 | } |
| 3442 | |
Sage Weil | 9bd2e6f | 2010-02-02 16:21:06 -0800 | [diff] [blame] | 3443 | static int invalidate_authorizer(struct ceph_connection *con) |
| 3444 | { |
| 3445 | struct ceph_mds_session *s = con->private; |
| 3446 | struct ceph_mds_client *mdsc = s->s_mdsc; |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3447 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
Sage Weil | 9bd2e6f | 2010-02-02 16:21:06 -0800 | [diff] [blame] | 3448 | |
| 3449 | if (ac->ops->invalidate_authorizer) |
| 3450 | ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
| 3451 | |
Yehuda Sadeh | 3d14c5d | 2010-04-06 15:14:15 -0700 | [diff] [blame] | 3452 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
Sage Weil | 9bd2e6f | 2010-02-02 16:21:06 -0800 | [diff] [blame] | 3453 | } |
| 3454 | |
Tobias Klauser | 9e32789 | 2010-05-20 10:40:19 +0200 | [diff] [blame] | 3455 | static const struct ceph_connection_operations mds_con_ops = { |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3456 | .get = con_get, |
| 3457 | .put = con_put, |
| 3458 | .dispatch = dispatch, |
Sage Weil | 4e7a5dc | 2009-11-18 16:19:57 -0800 | [diff] [blame] | 3459 | .get_authorizer = get_authorizer, |
| 3460 | .verify_authorizer_reply = verify_authorizer_reply, |
Sage Weil | 9bd2e6f | 2010-02-02 16:21:06 -0800 | [diff] [blame] | 3461 | .invalidate_authorizer = invalidate_authorizer, |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3462 | .peer_reset = peer_reset, |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3463 | }; |
| 3464 | |
Sage Weil | 2f2dc05 | 2009-10-06 11:31:09 -0700 | [diff] [blame] | 3465 | /* eof */ |