David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| 3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. |
| 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 8 | */ |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 9 | |
| 10 | #include "lock_dlm.h" |
| 11 | |
| 12 | /* A lock placed on this queue is re-submitted to DLM as soon as the lock_dlm |
| 13 | thread gets to it. */ |
| 14 | |
| 15 | static void queue_submit(struct gdlm_lock *lp) |
| 16 | { |
| 17 | struct gdlm_ls *ls = lp->ls; |
| 18 | |
| 19 | spin_lock(&ls->async_lock); |
| 20 | list_add_tail(&lp->delay_list, &ls->submit); |
| 21 | spin_unlock(&ls->async_lock); |
| 22 | wake_up(&ls->thread_wait); |
| 23 | } |
| 24 | |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 25 | static void process_blocking(struct gdlm_lock *lp, int bast_mode) |
| 26 | { |
| 27 | struct gdlm_ls *ls = lp->ls; |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 28 | unsigned int cb = 0; |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 29 | |
| 30 | switch (gdlm_make_lmstate(bast_mode)) { |
| 31 | case LM_ST_EXCLUSIVE: |
| 32 | cb = LM_CB_NEED_E; |
| 33 | break; |
| 34 | case LM_ST_DEFERRED: |
| 35 | cb = LM_CB_NEED_D; |
| 36 | break; |
| 37 | case LM_ST_SHARED: |
| 38 | cb = LM_CB_NEED_S; |
| 39 | break; |
| 40 | default: |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 41 | gdlm_assert(0, "unknown bast mode %u", lp->bast_mode); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 42 | } |
| 43 | |
Steven Whitehouse | 1c089c3 | 2006-09-07 15:50:20 -0400 | [diff] [blame] | 44 | ls->fscb(ls->sdp, cb, &lp->lockname); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 45 | } |
| 46 | |
Steven Whitehouse | 41d7db0 | 2007-05-14 17:43:26 +0100 | [diff] [blame] | 47 | static void wake_up_ast(struct gdlm_lock *lp) |
| 48 | { |
| 49 | clear_bit(LFL_AST_WAIT, &lp->flags); |
| 50 | smp_mb__after_clear_bit(); |
| 51 | wake_up_bit(&lp->flags, LFL_AST_WAIT); |
| 52 | } |
| 53 | |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 54 | static void process_complete(struct gdlm_lock *lp) |
| 55 | { |
| 56 | struct gdlm_ls *ls = lp->ls; |
| 57 | struct lm_async_cb acb; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 58 | s16 prev_mode = lp->cur; |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 59 | |
| 60 | memset(&acb, 0, sizeof(acb)); |
| 61 | |
| 62 | if (lp->lksb.sb_status == -DLM_ECANCEL) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 63 | log_info("complete dlm cancel %x,%llx flags %lx", |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 64 | lp->lockname.ln_type, |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 65 | (unsigned long long)lp->lockname.ln_number, |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 66 | lp->flags); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 67 | |
| 68 | lp->req = lp->cur; |
| 69 | acb.lc_ret |= LM_OUT_CANCELED; |
| 70 | if (lp->cur == DLM_LOCK_IV) |
| 71 | lp->lksb.sb_lkid = 0; |
| 72 | goto out; |
| 73 | } |
| 74 | |
| 75 | if (test_and_clear_bit(LFL_DLM_UNLOCK, &lp->flags)) { |
| 76 | if (lp->lksb.sb_status != -DLM_EUNLOCK) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 77 | log_info("unlock sb_status %d %x,%llx flags %lx", |
| 78 | lp->lksb.sb_status, lp->lockname.ln_type, |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 79 | (unsigned long long)lp->lockname.ln_number, |
| 80 | lp->flags); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 81 | return; |
| 82 | } |
| 83 | |
| 84 | lp->cur = DLM_LOCK_IV; |
| 85 | lp->req = DLM_LOCK_IV; |
| 86 | lp->lksb.sb_lkid = 0; |
| 87 | |
| 88 | if (test_and_clear_bit(LFL_UNLOCK_DELETE, &lp->flags)) { |
| 89 | gdlm_delete_lp(lp); |
| 90 | return; |
| 91 | } |
| 92 | goto out; |
| 93 | } |
| 94 | |
| 95 | if (lp->lksb.sb_flags & DLM_SBF_VALNOTVALID) |
| 96 | memset(lp->lksb.sb_lvbptr, 0, GDLM_LVB_SIZE); |
| 97 | |
| 98 | if (lp->lksb.sb_flags & DLM_SBF_ALTMODE) { |
| 99 | if (lp->req == DLM_LOCK_PR) |
| 100 | lp->req = DLM_LOCK_CW; |
| 101 | else if (lp->req == DLM_LOCK_CW) |
| 102 | lp->req = DLM_LOCK_PR; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * A canceled lock request. The lock was just taken off the delayed |
| 107 | * list and was never even submitted to dlm. |
| 108 | */ |
| 109 | |
| 110 | if (test_and_clear_bit(LFL_CANCEL, &lp->flags)) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 111 | log_info("complete internal cancel %x,%llx", |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 112 | lp->lockname.ln_type, |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 113 | (unsigned long long)lp->lockname.ln_number); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 114 | lp->req = lp->cur; |
| 115 | acb.lc_ret |= LM_OUT_CANCELED; |
| 116 | goto out; |
| 117 | } |
| 118 | |
| 119 | /* |
| 120 | * An error occured. |
| 121 | */ |
| 122 | |
| 123 | if (lp->lksb.sb_status) { |
| 124 | /* a "normal" error */ |
| 125 | if ((lp->lksb.sb_status == -EAGAIN) && |
| 126 | (lp->lkf & DLM_LKF_NOQUEUE)) { |
| 127 | lp->req = lp->cur; |
| 128 | if (lp->cur == DLM_LOCK_IV) |
| 129 | lp->lksb.sb_lkid = 0; |
| 130 | goto out; |
| 131 | } |
| 132 | |
| 133 | /* this could only happen with cancels I think */ |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 134 | log_info("ast sb_status %d %x,%llx flags %lx", |
| 135 | lp->lksb.sb_status, lp->lockname.ln_type, |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 136 | (unsigned long long)lp->lockname.ln_number, |
| 137 | lp->flags); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 138 | return; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * This is an AST for an EX->EX conversion for sync_lvb from GFS. |
| 143 | */ |
| 144 | |
| 145 | if (test_and_clear_bit(LFL_SYNC_LVB, &lp->flags)) { |
Steven Whitehouse | 41d7db0 | 2007-05-14 17:43:26 +0100 | [diff] [blame] | 146 | wake_up_ast(lp); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 147 | return; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * A lock has been demoted to NL because it initially completed during |
| 152 | * BLOCK_LOCKS. Now it must be requested in the originally requested |
| 153 | * mode. |
| 154 | */ |
| 155 | |
| 156 | if (test_and_clear_bit(LFL_REREQUEST, &lp->flags)) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 157 | gdlm_assert(lp->req == DLM_LOCK_NL, "%x,%llx", |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 158 | lp->lockname.ln_type, |
| 159 | (unsigned long long)lp->lockname.ln_number); |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 160 | gdlm_assert(lp->prev_req > DLM_LOCK_NL, "%x,%llx", |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 161 | lp->lockname.ln_type, |
| 162 | (unsigned long long)lp->lockname.ln_number); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 163 | |
| 164 | lp->cur = DLM_LOCK_NL; |
| 165 | lp->req = lp->prev_req; |
| 166 | lp->prev_req = DLM_LOCK_IV; |
| 167 | lp->lkf &= ~DLM_LKF_CONVDEADLK; |
| 168 | |
| 169 | set_bit(LFL_NOCACHE, &lp->flags); |
| 170 | |
| 171 | if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) && |
| 172 | !test_bit(LFL_NOBLOCK, &lp->flags)) |
| 173 | gdlm_queue_delayed(lp); |
| 174 | else |
| 175 | queue_submit(lp); |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * A request is granted during dlm recovery. It may be granted |
| 181 | * because the locks of a failed node were cleared. In that case, |
| 182 | * there may be inconsistent data beneath this lock and we must wait |
| 183 | * for recovery to complete to use it. When gfs recovery is done this |
| 184 | * granted lock will be converted to NL and then reacquired in this |
| 185 | * granted state. |
| 186 | */ |
| 187 | |
| 188 | if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) && |
| 189 | !test_bit(LFL_NOBLOCK, &lp->flags) && |
| 190 | lp->req != DLM_LOCK_NL) { |
| 191 | |
| 192 | lp->cur = lp->req; |
| 193 | lp->prev_req = lp->req; |
| 194 | lp->req = DLM_LOCK_NL; |
| 195 | lp->lkf |= DLM_LKF_CONVERT; |
| 196 | lp->lkf &= ~DLM_LKF_CONVDEADLK; |
| 197 | |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 198 | log_debug("rereq %x,%llx id %x %d,%d", |
David Woodhouse | 0239c4a | 2006-06-20 13:48:31 +0100 | [diff] [blame] | 199 | lp->lockname.ln_type, |
| 200 | (unsigned long long)lp->lockname.ln_number, |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 201 | lp->lksb.sb_lkid, lp->cur, lp->req); |
| 202 | |
| 203 | set_bit(LFL_REREQUEST, &lp->flags); |
| 204 | queue_submit(lp); |
| 205 | return; |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * DLM demoted the lock to NL before it was granted so GFS must be |
| 210 | * told it cannot cache data for this lock. |
| 211 | */ |
| 212 | |
| 213 | if (lp->lksb.sb_flags & DLM_SBF_DEMOTED) |
| 214 | set_bit(LFL_NOCACHE, &lp->flags); |
| 215 | |
Steven Whitehouse | a91ea69 | 2006-09-04 12:04:26 -0400 | [diff] [blame] | 216 | out: |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 217 | /* |
| 218 | * This is an internal lock_dlm lock |
| 219 | */ |
| 220 | |
| 221 | if (test_bit(LFL_INLOCK, &lp->flags)) { |
| 222 | clear_bit(LFL_NOBLOCK, &lp->flags); |
| 223 | lp->cur = lp->req; |
Steven Whitehouse | 41d7db0 | 2007-05-14 17:43:26 +0100 | [diff] [blame] | 224 | wake_up_ast(lp); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 225 | return; |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Normal completion of a lock request. Tell GFS it now has the lock. |
| 230 | */ |
| 231 | |
| 232 | clear_bit(LFL_NOBLOCK, &lp->flags); |
| 233 | lp->cur = lp->req; |
| 234 | |
| 235 | acb.lc_name = lp->lockname; |
| 236 | acb.lc_ret |= gdlm_make_lmstate(lp->cur); |
| 237 | |
| 238 | if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) && |
| 239 | (lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL)) |
| 240 | acb.lc_ret |= LM_OUT_CACHEABLE; |
| 241 | |
Steven Whitehouse | 1c089c3 | 2006-09-07 15:50:20 -0400 | [diff] [blame] | 242 | ls->fscb(ls->sdp, LM_CB_ASYNC, &acb); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 243 | } |
| 244 | |
| 245 | static inline int no_work(struct gdlm_ls *ls, int blocking) |
| 246 | { |
| 247 | int ret; |
| 248 | |
| 249 | spin_lock(&ls->async_lock); |
| 250 | ret = list_empty(&ls->complete) && list_empty(&ls->submit); |
| 251 | if (ret && blocking) |
| 252 | ret = list_empty(&ls->blocking); |
| 253 | spin_unlock(&ls->async_lock); |
| 254 | |
| 255 | return ret; |
| 256 | } |
| 257 | |
| 258 | static inline int check_drop(struct gdlm_ls *ls) |
| 259 | { |
| 260 | if (!ls->drop_locks_count) |
| 261 | return 0; |
| 262 | |
| 263 | if (time_after(jiffies, ls->drop_time + ls->drop_locks_period * HZ)) { |
| 264 | ls->drop_time = jiffies; |
| 265 | if (ls->all_locks_count >= ls->drop_locks_count) |
| 266 | return 1; |
| 267 | } |
| 268 | return 0; |
| 269 | } |
| 270 | |
Bob Peterson | 55c0c4a | 2007-09-14 09:27:59 -0500 | [diff] [blame] | 271 | static int gdlm_thread(void *data, int blist) |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 272 | { |
| 273 | struct gdlm_ls *ls = (struct gdlm_ls *) data; |
| 274 | struct gdlm_lock *lp = NULL; |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 275 | uint8_t complete, blocking, submit, drop; |
| 276 | DECLARE_WAITQUEUE(wait, current); |
| 277 | |
| 278 | /* Only thread1 is allowed to do blocking callbacks since gfs |
| 279 | may wait for a completion callback within a blocking cb. */ |
| 280 | |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 281 | while (!kthread_should_stop()) { |
| 282 | set_current_state(TASK_INTERRUPTIBLE); |
| 283 | add_wait_queue(&ls->thread_wait, &wait); |
| 284 | if (no_work(ls, blist)) |
| 285 | schedule(); |
| 286 | remove_wait_queue(&ls->thread_wait, &wait); |
| 287 | set_current_state(TASK_RUNNING); |
| 288 | |
| 289 | complete = blocking = submit = drop = 0; |
| 290 | |
| 291 | spin_lock(&ls->async_lock); |
| 292 | |
| 293 | if (blist && !list_empty(&ls->blocking)) { |
| 294 | lp = list_entry(ls->blocking.next, struct gdlm_lock, |
| 295 | blist); |
| 296 | list_del_init(&lp->blist); |
| 297 | blocking = lp->bast_mode; |
| 298 | lp->bast_mode = 0; |
| 299 | } else if (!list_empty(&ls->complete)) { |
| 300 | lp = list_entry(ls->complete.next, struct gdlm_lock, |
| 301 | clist); |
| 302 | list_del_init(&lp->clist); |
| 303 | complete = 1; |
| 304 | } else if (!list_empty(&ls->submit)) { |
| 305 | lp = list_entry(ls->submit.next, struct gdlm_lock, |
| 306 | delay_list); |
| 307 | list_del_init(&lp->delay_list); |
| 308 | submit = 1; |
| 309 | } |
| 310 | |
| 311 | drop = check_drop(ls); |
| 312 | spin_unlock(&ls->async_lock); |
| 313 | |
| 314 | if (complete) |
| 315 | process_complete(lp); |
| 316 | |
| 317 | else if (blocking) |
| 318 | process_blocking(lp, blocking); |
| 319 | |
| 320 | else if (submit) |
David Teigland | 8d3b35a | 2006-02-23 10:00:56 +0000 | [diff] [blame] | 321 | gdlm_do_lock(lp); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 322 | |
| 323 | if (drop) |
Steven Whitehouse | 1c089c3 | 2006-09-07 15:50:20 -0400 | [diff] [blame] | 324 | ls->fscb(ls->sdp, LM_CB_DROPLOCKS, NULL); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 325 | |
| 326 | schedule(); |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
Bob Peterson | 55c0c4a | 2007-09-14 09:27:59 -0500 | [diff] [blame] | 332 | static int gdlm_thread1(void *data) |
| 333 | { |
| 334 | return gdlm_thread(data, 1); |
| 335 | } |
| 336 | |
| 337 | static int gdlm_thread2(void *data) |
| 338 | { |
| 339 | return gdlm_thread(data, 0); |
| 340 | } |
| 341 | |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 342 | int gdlm_init_threads(struct gdlm_ls *ls) |
| 343 | { |
| 344 | struct task_struct *p; |
| 345 | int error; |
| 346 | |
Bob Peterson | 55c0c4a | 2007-09-14 09:27:59 -0500 | [diff] [blame] | 347 | p = kthread_run(gdlm_thread1, ls, "lock_dlm1"); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 348 | error = IS_ERR(p); |
| 349 | if (error) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 350 | log_error("can't start lock_dlm1 thread %d", error); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 351 | return error; |
| 352 | } |
| 353 | ls->thread1 = p; |
| 354 | |
Bob Peterson | 55c0c4a | 2007-09-14 09:27:59 -0500 | [diff] [blame] | 355 | p = kthread_run(gdlm_thread2, ls, "lock_dlm2"); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 356 | error = IS_ERR(p); |
| 357 | if (error) { |
David Teigland | 869d81d | 2006-01-17 08:47:12 +0000 | [diff] [blame] | 358 | log_error("can't start lock_dlm2 thread %d", error); |
David Teigland | 29b7998 | 2006-01-16 16:52:38 +0000 | [diff] [blame] | 359 | kthread_stop(ls->thread1); |
| 360 | return error; |
| 361 | } |
| 362 | ls->thread2 = p; |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | void gdlm_release_threads(struct gdlm_ls *ls) |
| 368 | { |
| 369 | kthread_stop(ls->thread1); |
| 370 | kthread_stop(ls->thread2); |
| 371 | } |
| 372 | |