Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * dlmglue.c |
| 5 | * |
| 6 | * Code which implements an OCFS2 specific interface to our DLM. |
| 7 | * |
| 8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public |
| 21 | * License along with this program; if not, write to the |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | * Boston, MA 021110-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/highmem.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/smp_lock.h> |
| 31 | #include <linux/crc32.h> |
| 32 | #include <linux/kthread.h> |
| 33 | #include <linux/pagemap.h> |
| 34 | #include <linux/debugfs.h> |
| 35 | #include <linux/seq_file.h> |
| 36 | |
| 37 | #include <cluster/heartbeat.h> |
| 38 | #include <cluster/nodemanager.h> |
| 39 | #include <cluster/tcp.h> |
| 40 | |
| 41 | #include <dlm/dlmapi.h> |
| 42 | |
| 43 | #define MLOG_MASK_PREFIX ML_DLM_GLUE |
| 44 | #include <cluster/masklog.h> |
| 45 | |
| 46 | #include "ocfs2.h" |
| 47 | |
| 48 | #include "alloc.h" |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 49 | #include "dcache.h" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 50 | #include "dlmglue.h" |
| 51 | #include "extent_map.h" |
| 52 | #include "heartbeat.h" |
| 53 | #include "inode.h" |
| 54 | #include "journal.h" |
| 55 | #include "slot_map.h" |
| 56 | #include "super.h" |
| 57 | #include "uptodate.h" |
| 58 | #include "vote.h" |
| 59 | |
| 60 | #include "buffer_head_io.h" |
| 61 | |
| 62 | struct ocfs2_mask_waiter { |
| 63 | struct list_head mw_item; |
| 64 | int mw_status; |
| 65 | struct completion mw_complete; |
| 66 | unsigned long mw_mask; |
| 67 | unsigned long mw_goal; |
| 68 | }; |
| 69 | |
| 70 | static void ocfs2_inode_ast_func(void *opaque); |
| 71 | static void ocfs2_inode_bast_func(void *opaque, |
| 72 | int level); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 73 | static void ocfs2_dentry_ast_func(void *opaque); |
| 74 | static void ocfs2_dentry_bast_func(void *opaque, |
| 75 | int level); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 76 | static void ocfs2_super_ast_func(void *opaque); |
| 77 | static void ocfs2_super_bast_func(void *opaque, |
| 78 | int level); |
| 79 | static void ocfs2_rename_ast_func(void *opaque); |
| 80 | static void ocfs2_rename_bast_func(void *opaque, |
| 81 | int level); |
| 82 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 83 | /* |
| 84 | * Return value from ocfs2_convert_worker_t functions. |
| 85 | * |
| 86 | * These control the precise actions of ocfs2_generic_unblock_lock() |
| 87 | * and ocfs2_process_blocked_lock() |
| 88 | * |
| 89 | */ |
| 90 | enum ocfs2_unblock_action { |
| 91 | UNBLOCK_CONTINUE = 0, /* Continue downconvert */ |
| 92 | UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire |
| 93 | * ->post_unlock callback */ |
| 94 | UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire |
| 95 | * ->post_unlock() callback. */ |
| 96 | }; |
| 97 | |
| 98 | struct ocfs2_unblock_ctl { |
| 99 | int requeue; |
| 100 | enum ocfs2_unblock_action unblock_action; |
| 101 | }; |
| 102 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 103 | /* so far, all locks have gotten along with the same unlock ast */ |
| 104 | static void ocfs2_unlock_ast_func(void *opaque, |
| 105 | enum dlm_status status); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 106 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 107 | struct ocfs2_unblock_ctl *ctl); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 108 | static int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 109 | struct ocfs2_unblock_ctl *ctl); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 110 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 111 | struct ocfs2_unblock_ctl *ctl); |
| 112 | static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, |
| 113 | struct ocfs2_unblock_ctl *ctl); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 114 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 115 | struct ocfs2_unblock_ctl *ctl); |
| 116 | |
| 117 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, |
| 118 | struct ocfs2_lock_res *lockres); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 119 | |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 120 | /* |
| 121 | * OCFS2 Lock Resource Operations |
| 122 | * |
| 123 | * These fine tune the behavior of the generic dlmglue locking infrastructure. |
| 124 | */ |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 125 | struct ocfs2_lock_res_ops { |
| 126 | void (*ast)(void *); |
| 127 | void (*bast)(void *, int); |
| 128 | void (*unlock_ast)(void *, enum dlm_status); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 129 | int (*unblock)(struct ocfs2_lock_res *, struct ocfs2_unblock_ctl *); |
| 130 | void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 131 | |
| 132 | /* |
| 133 | * LOCK_TYPE_* flags which describe the specific requirements |
| 134 | * of a lock type. Descriptions of each individual flag follow. |
| 135 | */ |
| 136 | int flags; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 137 | }; |
| 138 | |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 139 | /* |
| 140 | * Some locks want to "refresh" potentially stale data when a |
| 141 | * meaningful (PRMODE or EXMODE) lock level is first obtained. If this |
| 142 | * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the |
| 143 | * individual lockres l_flags member from the ast function. It is |
| 144 | * expected that the locking wrapper will clear the |
| 145 | * OCFS2_LOCK_NEEDS_REFRESH flag when done. |
| 146 | */ |
| 147 | #define LOCK_TYPE_REQUIRES_REFRESH 0x1 |
| 148 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 149 | typedef int (ocfs2_convert_worker_t)(struct ocfs2_lock_res *, int); |
| 150 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, |
| 151 | struct ocfs2_lock_res *lockres, |
| 152 | struct ocfs2_unblock_ctl *ctl, |
| 153 | ocfs2_convert_worker_t *worker); |
| 154 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 155 | static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { |
| 156 | .ast = ocfs2_inode_ast_func, |
| 157 | .bast = ocfs2_inode_bast_func, |
| 158 | .unlock_ast = ocfs2_unlock_ast_func, |
| 159 | .unblock = ocfs2_unblock_inode_lock, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 160 | .flags = 0, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 161 | }; |
| 162 | |
| 163 | static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { |
| 164 | .ast = ocfs2_inode_ast_func, |
| 165 | .bast = ocfs2_inode_bast_func, |
| 166 | .unlock_ast = ocfs2_unlock_ast_func, |
| 167 | .unblock = ocfs2_unblock_meta, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 168 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 169 | }; |
| 170 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 171 | static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { |
| 172 | .ast = ocfs2_inode_ast_func, |
| 173 | .bast = ocfs2_inode_bast_func, |
| 174 | .unlock_ast = ocfs2_unlock_ast_func, |
| 175 | .unblock = ocfs2_unblock_data, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 176 | .flags = 0, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 177 | }; |
| 178 | |
| 179 | static struct ocfs2_lock_res_ops ocfs2_super_lops = { |
| 180 | .ast = ocfs2_super_ast_func, |
| 181 | .bast = ocfs2_super_bast_func, |
| 182 | .unlock_ast = ocfs2_unlock_ast_func, |
| 183 | .unblock = ocfs2_unblock_osb_lock, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 184 | .flags = LOCK_TYPE_REQUIRES_REFRESH, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 185 | }; |
| 186 | |
| 187 | static struct ocfs2_lock_res_ops ocfs2_rename_lops = { |
| 188 | .ast = ocfs2_rename_ast_func, |
| 189 | .bast = ocfs2_rename_bast_func, |
| 190 | .unlock_ast = ocfs2_unlock_ast_func, |
| 191 | .unblock = ocfs2_unblock_osb_lock, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 192 | .flags = 0, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 193 | }; |
| 194 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 195 | static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { |
| 196 | .ast = ocfs2_dentry_ast_func, |
| 197 | .bast = ocfs2_dentry_bast_func, |
| 198 | .unlock_ast = ocfs2_unlock_ast_func, |
| 199 | .unblock = ocfs2_unblock_dentry_lock, |
| 200 | .post_unlock = ocfs2_dentry_post_unlock, |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 201 | .flags = 0, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 202 | }; |
| 203 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 204 | static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) |
| 205 | { |
| 206 | return lockres->l_type == OCFS2_LOCK_TYPE_META || |
| 207 | lockres->l_type == OCFS2_LOCK_TYPE_DATA || |
| 208 | lockres->l_type == OCFS2_LOCK_TYPE_RW; |
| 209 | } |
| 210 | |
| 211 | static inline int ocfs2_is_super_lock(struct ocfs2_lock_res *lockres) |
| 212 | { |
| 213 | return lockres->l_type == OCFS2_LOCK_TYPE_SUPER; |
| 214 | } |
| 215 | |
| 216 | static inline int ocfs2_is_rename_lock(struct ocfs2_lock_res *lockres) |
| 217 | { |
| 218 | return lockres->l_type == OCFS2_LOCK_TYPE_RENAME; |
| 219 | } |
| 220 | |
| 221 | static inline struct ocfs2_super *ocfs2_lock_res_super(struct ocfs2_lock_res *lockres) |
| 222 | { |
| 223 | BUG_ON(!ocfs2_is_super_lock(lockres) |
| 224 | && !ocfs2_is_rename_lock(lockres)); |
| 225 | |
| 226 | return (struct ocfs2_super *) lockres->l_priv; |
| 227 | } |
| 228 | |
| 229 | static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) |
| 230 | { |
| 231 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 232 | |
| 233 | return (struct inode *) lockres->l_priv; |
| 234 | } |
| 235 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 236 | static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) |
| 237 | { |
| 238 | BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); |
| 239 | |
| 240 | return (struct ocfs2_dentry_lock *)lockres->l_priv; |
| 241 | } |
| 242 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 243 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
| 244 | struct ocfs2_lock_res *lockres, |
| 245 | int level, |
| 246 | int dlm_flags); |
| 247 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
| 248 | int wanted); |
| 249 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, |
| 250 | struct ocfs2_lock_res *lockres, |
| 251 | int level); |
| 252 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); |
| 253 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); |
| 254 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); |
| 255 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); |
| 256 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
| 257 | struct ocfs2_lock_res *lockres); |
| 258 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
| 259 | int convert); |
| 260 | #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ |
| 261 | mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ |
| 262 | "resource %s: %s\n", dlm_errname(_stat), _func, \ |
| 263 | _lockres->l_name, dlm_errmsg(_stat)); \ |
| 264 | } while (0) |
| 265 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, |
| 266 | struct ocfs2_lock_res *lockres); |
| 267 | static int ocfs2_meta_lock_update(struct inode *inode, |
| 268 | struct buffer_head **bh); |
| 269 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); |
| 270 | static inline int ocfs2_highest_compat_lock_level(int level); |
| 271 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, |
| 272 | struct ocfs2_lock_res *lockres, |
| 273 | int new_level); |
| 274 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 275 | static void ocfs2_build_lock_name(enum ocfs2_lock_type type, |
| 276 | u64 blkno, |
| 277 | u32 generation, |
| 278 | char *name) |
| 279 | { |
| 280 | int len; |
| 281 | |
| 282 | mlog_entry_void(); |
| 283 | |
| 284 | BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); |
| 285 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 286 | len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", |
| 287 | ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, |
| 288 | (long long)blkno, generation); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 289 | |
| 290 | BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); |
| 291 | |
| 292 | mlog(0, "built lock resource with name: %s\n", name); |
| 293 | |
| 294 | mlog_exit_void(); |
| 295 | } |
| 296 | |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 297 | static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 298 | |
| 299 | static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, |
| 300 | struct ocfs2_dlm_debug *dlm_debug) |
| 301 | { |
| 302 | mlog(0, "Add tracking for lockres %s\n", res->l_name); |
| 303 | |
| 304 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 305 | list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); |
| 306 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 307 | } |
| 308 | |
| 309 | static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) |
| 310 | { |
| 311 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 312 | if (!list_empty(&res->l_debug_list)) |
| 313 | list_del_init(&res->l_debug_list); |
| 314 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 315 | } |
| 316 | |
| 317 | static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, |
| 318 | struct ocfs2_lock_res *res, |
| 319 | enum ocfs2_lock_type type, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 320 | struct ocfs2_lock_res_ops *ops, |
| 321 | void *priv) |
| 322 | { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 323 | res->l_type = type; |
| 324 | res->l_ops = ops; |
| 325 | res->l_priv = priv; |
| 326 | |
| 327 | res->l_level = LKM_IVMODE; |
| 328 | res->l_requested = LKM_IVMODE; |
| 329 | res->l_blocking = LKM_IVMODE; |
| 330 | res->l_action = OCFS2_AST_INVALID; |
| 331 | res->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 332 | |
| 333 | res->l_flags = OCFS2_LOCK_INITIALIZED; |
| 334 | |
| 335 | ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); |
| 336 | } |
| 337 | |
| 338 | void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) |
| 339 | { |
| 340 | /* This also clears out the lock status block */ |
| 341 | memset(res, 0, sizeof(struct ocfs2_lock_res)); |
| 342 | spin_lock_init(&res->l_lock); |
| 343 | init_waitqueue_head(&res->l_event); |
| 344 | INIT_LIST_HEAD(&res->l_blocked_list); |
| 345 | INIT_LIST_HEAD(&res->l_mask_waiters); |
| 346 | } |
| 347 | |
| 348 | void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, |
| 349 | enum ocfs2_lock_type type, |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 350 | unsigned int generation, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 351 | struct inode *inode) |
| 352 | { |
| 353 | struct ocfs2_lock_res_ops *ops; |
| 354 | |
| 355 | switch(type) { |
| 356 | case OCFS2_LOCK_TYPE_RW: |
| 357 | ops = &ocfs2_inode_rw_lops; |
| 358 | break; |
| 359 | case OCFS2_LOCK_TYPE_META: |
| 360 | ops = &ocfs2_inode_meta_lops; |
| 361 | break; |
| 362 | case OCFS2_LOCK_TYPE_DATA: |
| 363 | ops = &ocfs2_inode_data_lops; |
| 364 | break; |
| 365 | default: |
| 366 | mlog_bug_on_msg(1, "type: %d\n", type); |
| 367 | ops = NULL; /* thanks, gcc */ |
| 368 | break; |
| 369 | }; |
| 370 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 371 | ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 372 | generation, res->l_name); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 373 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); |
| 374 | } |
| 375 | |
| 376 | static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) |
| 377 | { |
| 378 | __be64 inode_blkno_be; |
| 379 | |
| 380 | memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], |
| 381 | sizeof(__be64)); |
| 382 | |
| 383 | return be64_to_cpu(inode_blkno_be); |
| 384 | } |
| 385 | |
| 386 | void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, |
| 387 | u64 parent, struct inode *inode) |
| 388 | { |
| 389 | int len; |
| 390 | u64 inode_blkno = OCFS2_I(inode)->ip_blkno; |
| 391 | __be64 inode_blkno_be = cpu_to_be64(inode_blkno); |
| 392 | struct ocfs2_lock_res *lockres = &dl->dl_lockres; |
| 393 | |
| 394 | ocfs2_lock_res_init_once(lockres); |
| 395 | |
| 396 | /* |
| 397 | * Unfortunately, the standard lock naming scheme won't work |
| 398 | * here because we have two 16 byte values to use. Instead, |
| 399 | * we'll stuff the inode number as a binary value. We still |
| 400 | * want error prints to show something without garbling the |
| 401 | * display, so drop a null byte in there before the inode |
| 402 | * number. A future version of OCFS2 will likely use all |
| 403 | * binary lock names. The stringified names have been a |
| 404 | * tremendous aid in debugging, but now that the debugfs |
| 405 | * interface exists, we can mangle things there if need be. |
| 406 | * |
| 407 | * NOTE: We also drop the standard "pad" value (the total lock |
| 408 | * name size stays the same though - the last part is all |
| 409 | * zeros due to the memset in ocfs2_lock_res_init_once() |
| 410 | */ |
| 411 | len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, |
| 412 | "%c%016llx", |
| 413 | ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), |
| 414 | (long long)parent); |
| 415 | |
| 416 | BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); |
| 417 | |
| 418 | memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, |
| 419 | sizeof(__be64)); |
| 420 | |
| 421 | ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, |
| 422 | OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, |
| 423 | dl); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, |
| 427 | struct ocfs2_super *osb) |
| 428 | { |
| 429 | /* Superblock lockres doesn't come from a slab so we call init |
| 430 | * once on it manually. */ |
| 431 | ocfs2_lock_res_init_once(res); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 432 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, |
| 433 | 0, res->l_name); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 434 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 435 | &ocfs2_super_lops, osb); |
| 436 | } |
| 437 | |
| 438 | static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, |
| 439 | struct ocfs2_super *osb) |
| 440 | { |
| 441 | /* Rename lockres doesn't come from a slab so we call init |
| 442 | * once on it manually. */ |
| 443 | ocfs2_lock_res_init_once(res); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 444 | ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); |
| 445 | ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 446 | &ocfs2_rename_lops, osb); |
| 447 | } |
| 448 | |
| 449 | void ocfs2_lock_res_free(struct ocfs2_lock_res *res) |
| 450 | { |
| 451 | mlog_entry_void(); |
| 452 | |
| 453 | if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) |
| 454 | return; |
| 455 | |
| 456 | ocfs2_remove_lockres_tracking(res); |
| 457 | |
| 458 | mlog_bug_on_msg(!list_empty(&res->l_blocked_list), |
| 459 | "Lockres %s is on the blocked list\n", |
| 460 | res->l_name); |
| 461 | mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), |
| 462 | "Lockres %s has mask waiters pending\n", |
| 463 | res->l_name); |
| 464 | mlog_bug_on_msg(spin_is_locked(&res->l_lock), |
| 465 | "Lockres %s is locked\n", |
| 466 | res->l_name); |
| 467 | mlog_bug_on_msg(res->l_ro_holders, |
| 468 | "Lockres %s has %u ro holders\n", |
| 469 | res->l_name, res->l_ro_holders); |
| 470 | mlog_bug_on_msg(res->l_ex_holders, |
| 471 | "Lockres %s has %u ex holders\n", |
| 472 | res->l_name, res->l_ex_holders); |
| 473 | |
| 474 | /* Need to clear out the lock status block for the dlm */ |
| 475 | memset(&res->l_lksb, 0, sizeof(res->l_lksb)); |
| 476 | |
| 477 | res->l_flags = 0UL; |
| 478 | mlog_exit_void(); |
| 479 | } |
| 480 | |
| 481 | static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, |
| 482 | int level) |
| 483 | { |
| 484 | mlog_entry_void(); |
| 485 | |
| 486 | BUG_ON(!lockres); |
| 487 | |
| 488 | switch(level) { |
| 489 | case LKM_EXMODE: |
| 490 | lockres->l_ex_holders++; |
| 491 | break; |
| 492 | case LKM_PRMODE: |
| 493 | lockres->l_ro_holders++; |
| 494 | break; |
| 495 | default: |
| 496 | BUG(); |
| 497 | } |
| 498 | |
| 499 | mlog_exit_void(); |
| 500 | } |
| 501 | |
| 502 | static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, |
| 503 | int level) |
| 504 | { |
| 505 | mlog_entry_void(); |
| 506 | |
| 507 | BUG_ON(!lockres); |
| 508 | |
| 509 | switch(level) { |
| 510 | case LKM_EXMODE: |
| 511 | BUG_ON(!lockres->l_ex_holders); |
| 512 | lockres->l_ex_holders--; |
| 513 | break; |
| 514 | case LKM_PRMODE: |
| 515 | BUG_ON(!lockres->l_ro_holders); |
| 516 | lockres->l_ro_holders--; |
| 517 | break; |
| 518 | default: |
| 519 | BUG(); |
| 520 | } |
| 521 | mlog_exit_void(); |
| 522 | } |
| 523 | |
| 524 | /* WARNING: This function lives in a world where the only three lock |
| 525 | * levels are EX, PR, and NL. It *will* have to be adjusted when more |
| 526 | * lock types are added. */ |
| 527 | static inline int ocfs2_highest_compat_lock_level(int level) |
| 528 | { |
| 529 | int new_level = LKM_EXMODE; |
| 530 | |
| 531 | if (level == LKM_EXMODE) |
| 532 | new_level = LKM_NLMODE; |
| 533 | else if (level == LKM_PRMODE) |
| 534 | new_level = LKM_PRMODE; |
| 535 | return new_level; |
| 536 | } |
| 537 | |
| 538 | static void lockres_set_flags(struct ocfs2_lock_res *lockres, |
| 539 | unsigned long newflags) |
| 540 | { |
| 541 | struct list_head *pos, *tmp; |
| 542 | struct ocfs2_mask_waiter *mw; |
| 543 | |
| 544 | assert_spin_locked(&lockres->l_lock); |
| 545 | |
| 546 | lockres->l_flags = newflags; |
| 547 | |
| 548 | list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { |
| 549 | mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); |
| 550 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
| 551 | continue; |
| 552 | |
| 553 | list_del_init(&mw->mw_item); |
| 554 | mw->mw_status = 0; |
| 555 | complete(&mw->mw_complete); |
| 556 | } |
| 557 | } |
| 558 | static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) |
| 559 | { |
| 560 | lockres_set_flags(lockres, lockres->l_flags | or); |
| 561 | } |
| 562 | static void lockres_clear_flags(struct ocfs2_lock_res *lockres, |
| 563 | unsigned long clear) |
| 564 | { |
| 565 | lockres_set_flags(lockres, lockres->l_flags & ~clear); |
| 566 | } |
| 567 | |
| 568 | static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) |
| 569 | { |
| 570 | mlog_entry_void(); |
| 571 | |
| 572 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 573 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
| 574 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 575 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); |
| 576 | |
| 577 | lockres->l_level = lockres->l_requested; |
| 578 | if (lockres->l_level <= |
| 579 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) { |
| 580 | lockres->l_blocking = LKM_NLMODE; |
| 581 | lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); |
| 582 | } |
| 583 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 584 | |
| 585 | mlog_exit_void(); |
| 586 | } |
| 587 | |
| 588 | static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) |
| 589 | { |
| 590 | mlog_entry_void(); |
| 591 | |
| 592 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 593 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); |
| 594 | |
| 595 | /* Convert from RO to EX doesn't really need anything as our |
| 596 | * information is already up to data. Convert from NL to |
| 597 | * *anything* however should mark ourselves as needing an |
| 598 | * update */ |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 599 | if (lockres->l_level == LKM_NLMODE && |
| 600 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 601 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 602 | |
| 603 | lockres->l_level = lockres->l_requested; |
| 604 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 605 | |
| 606 | mlog_exit_void(); |
| 607 | } |
| 608 | |
| 609 | static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) |
| 610 | { |
| 611 | mlog_entry_void(); |
| 612 | |
| 613 | BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); |
| 614 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
| 615 | |
| 616 | if (lockres->l_requested > LKM_NLMODE && |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 617 | !(lockres->l_flags & OCFS2_LOCK_LOCAL) && |
| 618 | lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 619 | lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 620 | |
| 621 | lockres->l_level = lockres->l_requested; |
| 622 | lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); |
| 623 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 624 | |
| 625 | mlog_exit_void(); |
| 626 | } |
| 627 | |
| 628 | static void ocfs2_inode_ast_func(void *opaque) |
| 629 | { |
| 630 | struct ocfs2_lock_res *lockres = opaque; |
| 631 | struct inode *inode; |
| 632 | struct dlm_lockstatus *lksb; |
| 633 | unsigned long flags; |
| 634 | |
| 635 | mlog_entry_void(); |
| 636 | |
| 637 | inode = ocfs2_lock_res_inode(lockres); |
| 638 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 639 | mlog(0, "AST fired for inode %llu, l_action = %u, type = %s\n", |
| 640 | (unsigned long long)OCFS2_I(inode)->ip_blkno, lockres->l_action, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 641 | ocfs2_lock_type_string(lockres->l_type)); |
| 642 | |
| 643 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 644 | |
| 645 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 646 | |
| 647 | lksb = &(lockres->l_lksb); |
| 648 | if (lksb->status != DLM_NORMAL) { |
| 649 | mlog(ML_ERROR, "ocfs2_inode_ast_func: lksb status value of %u " |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 650 | "on inode %llu\n", lksb->status, |
| 651 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 652 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 653 | mlog_exit_void(); |
| 654 | return; |
| 655 | } |
| 656 | |
| 657 | switch(lockres->l_action) { |
| 658 | case OCFS2_AST_ATTACH: |
| 659 | ocfs2_generic_handle_attach_action(lockres); |
| 660 | lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); |
| 661 | break; |
| 662 | case OCFS2_AST_CONVERT: |
| 663 | ocfs2_generic_handle_convert_action(lockres); |
| 664 | break; |
| 665 | case OCFS2_AST_DOWNCONVERT: |
| 666 | ocfs2_generic_handle_downconvert_action(lockres); |
| 667 | break; |
| 668 | default: |
| 669 | mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " |
| 670 | "lockres flags = 0x%lx, unlock action: %u\n", |
| 671 | lockres->l_name, lockres->l_action, lockres->l_flags, |
| 672 | lockres->l_unlock_action); |
| 673 | |
| 674 | BUG(); |
| 675 | } |
| 676 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 677 | /* set it to something invalid so if we get called again we |
| 678 | * can catch it. */ |
| 679 | lockres->l_action = OCFS2_AST_INVALID; |
| 680 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 681 | wake_up(&lockres->l_event); |
| 682 | |
| 683 | mlog_exit_void(); |
| 684 | } |
| 685 | |
| 686 | static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, |
| 687 | int level) |
| 688 | { |
| 689 | int needs_downconvert = 0; |
| 690 | mlog_entry_void(); |
| 691 | |
| 692 | assert_spin_locked(&lockres->l_lock); |
| 693 | |
| 694 | lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); |
| 695 | |
| 696 | if (level > lockres->l_blocking) { |
| 697 | /* only schedule a downconvert if we haven't already scheduled |
| 698 | * one that goes low enough to satisfy the level we're |
| 699 | * blocking. this also catches the case where we get |
| 700 | * duplicate BASTs */ |
| 701 | if (ocfs2_highest_compat_lock_level(level) < |
| 702 | ocfs2_highest_compat_lock_level(lockres->l_blocking)) |
| 703 | needs_downconvert = 1; |
| 704 | |
| 705 | lockres->l_blocking = level; |
| 706 | } |
| 707 | |
| 708 | mlog_exit(needs_downconvert); |
| 709 | return needs_downconvert; |
| 710 | } |
| 711 | |
| 712 | static void ocfs2_generic_bast_func(struct ocfs2_super *osb, |
| 713 | struct ocfs2_lock_res *lockres, |
| 714 | int level) |
| 715 | { |
| 716 | int needs_downconvert; |
| 717 | unsigned long flags; |
| 718 | |
| 719 | mlog_entry_void(); |
| 720 | |
| 721 | BUG_ON(level <= LKM_NLMODE); |
| 722 | |
| 723 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 724 | needs_downconvert = ocfs2_generic_handle_bast(lockres, level); |
| 725 | if (needs_downconvert) |
| 726 | ocfs2_schedule_blocked_lock(osb, lockres); |
| 727 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 728 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 729 | wake_up(&lockres->l_event); |
| 730 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 731 | ocfs2_kick_vote_thread(osb); |
| 732 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 733 | mlog_exit_void(); |
| 734 | } |
| 735 | |
| 736 | static void ocfs2_inode_bast_func(void *opaque, int level) |
| 737 | { |
| 738 | struct ocfs2_lock_res *lockres = opaque; |
| 739 | struct inode *inode; |
| 740 | struct ocfs2_super *osb; |
| 741 | |
| 742 | mlog_entry_void(); |
| 743 | |
| 744 | BUG_ON(!ocfs2_is_inode_lock(lockres)); |
| 745 | |
| 746 | inode = ocfs2_lock_res_inode(lockres); |
| 747 | osb = OCFS2_SB(inode->i_sb); |
| 748 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 749 | mlog(0, "BAST fired for inode %llu, blocking %d, level %d type %s\n", |
| 750 | (unsigned long long)OCFS2_I(inode)->ip_blkno, level, |
| 751 | lockres->l_level, ocfs2_lock_type_string(lockres->l_type)); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 752 | |
| 753 | ocfs2_generic_bast_func(osb, lockres, level); |
| 754 | |
| 755 | mlog_exit_void(); |
| 756 | } |
| 757 | |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 758 | static void ocfs2_generic_ast_func(struct ocfs2_lock_res *lockres) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 759 | { |
| 760 | struct dlm_lockstatus *lksb = &lockres->l_lksb; |
| 761 | unsigned long flags; |
| 762 | |
| 763 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 764 | |
| 765 | if (lksb->status != DLM_NORMAL) { |
| 766 | mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", |
| 767 | lockres->l_name, lksb->status); |
| 768 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 769 | return; |
| 770 | } |
| 771 | |
| 772 | switch(lockres->l_action) { |
| 773 | case OCFS2_AST_ATTACH: |
| 774 | ocfs2_generic_handle_attach_action(lockres); |
| 775 | break; |
| 776 | case OCFS2_AST_CONVERT: |
| 777 | ocfs2_generic_handle_convert_action(lockres); |
| 778 | break; |
| 779 | case OCFS2_AST_DOWNCONVERT: |
| 780 | ocfs2_generic_handle_downconvert_action(lockres); |
| 781 | break; |
| 782 | default: |
| 783 | BUG(); |
| 784 | } |
| 785 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 786 | /* set it to something invalid so if we get called again we |
| 787 | * can catch it. */ |
| 788 | lockres->l_action = OCFS2_AST_INVALID; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 789 | |
| 790 | wake_up(&lockres->l_event); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 791 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | static void ocfs2_super_ast_func(void *opaque) |
| 795 | { |
| 796 | struct ocfs2_lock_res *lockres = opaque; |
| 797 | |
| 798 | mlog_entry_void(); |
| 799 | mlog(0, "Superblock AST fired\n"); |
| 800 | |
| 801 | BUG_ON(!ocfs2_is_super_lock(lockres)); |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 802 | ocfs2_generic_ast_func(lockres); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 803 | |
| 804 | mlog_exit_void(); |
| 805 | } |
| 806 | |
| 807 | static void ocfs2_super_bast_func(void *opaque, |
| 808 | int level) |
| 809 | { |
| 810 | struct ocfs2_lock_res *lockres = opaque; |
| 811 | struct ocfs2_super *osb; |
| 812 | |
| 813 | mlog_entry_void(); |
| 814 | mlog(0, "Superblock BAST fired\n"); |
| 815 | |
| 816 | BUG_ON(!ocfs2_is_super_lock(lockres)); |
| 817 | osb = ocfs2_lock_res_super(lockres); |
| 818 | ocfs2_generic_bast_func(osb, lockres, level); |
| 819 | |
| 820 | mlog_exit_void(); |
| 821 | } |
| 822 | |
| 823 | static void ocfs2_rename_ast_func(void *opaque) |
| 824 | { |
| 825 | struct ocfs2_lock_res *lockres = opaque; |
| 826 | |
| 827 | mlog_entry_void(); |
| 828 | |
| 829 | mlog(0, "Rename AST fired\n"); |
| 830 | |
| 831 | BUG_ON(!ocfs2_is_rename_lock(lockres)); |
| 832 | |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 833 | ocfs2_generic_ast_func(lockres); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 834 | |
| 835 | mlog_exit_void(); |
| 836 | } |
| 837 | |
| 838 | static void ocfs2_rename_bast_func(void *opaque, |
| 839 | int level) |
| 840 | { |
| 841 | struct ocfs2_lock_res *lockres = opaque; |
| 842 | struct ocfs2_super *osb; |
| 843 | |
| 844 | mlog_entry_void(); |
| 845 | |
| 846 | mlog(0, "Rename BAST fired\n"); |
| 847 | |
| 848 | BUG_ON(!ocfs2_is_rename_lock(lockres)); |
| 849 | |
| 850 | osb = ocfs2_lock_res_super(lockres); |
| 851 | ocfs2_generic_bast_func(osb, lockres, level); |
| 852 | |
| 853 | mlog_exit_void(); |
| 854 | } |
| 855 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 856 | static void ocfs2_dentry_ast_func(void *opaque) |
| 857 | { |
| 858 | struct ocfs2_lock_res *lockres = opaque; |
| 859 | |
| 860 | BUG_ON(!lockres); |
| 861 | |
Mark Fasheh | f625c97 | 2006-09-12 21:24:53 -0700 | [diff] [blame^] | 862 | ocfs2_generic_ast_func(lockres); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 863 | } |
| 864 | |
| 865 | static void ocfs2_dentry_bast_func(void *opaque, int level) |
| 866 | { |
| 867 | struct ocfs2_lock_res *lockres = opaque; |
| 868 | struct ocfs2_dentry_lock *dl = lockres->l_priv; |
| 869 | struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb); |
| 870 | |
| 871 | mlog(0, "Dentry bast: level: %d, name: %s\n", level, |
| 872 | lockres->l_name); |
| 873 | |
| 874 | ocfs2_generic_bast_func(osb, lockres, level); |
| 875 | } |
| 876 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 877 | static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, |
| 878 | int convert) |
| 879 | { |
| 880 | unsigned long flags; |
| 881 | |
| 882 | mlog_entry_void(); |
| 883 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 884 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 885 | if (convert) |
| 886 | lockres->l_action = OCFS2_AST_INVALID; |
| 887 | else |
| 888 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 889 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 890 | |
| 891 | wake_up(&lockres->l_event); |
| 892 | mlog_exit_void(); |
| 893 | } |
| 894 | |
| 895 | /* Note: If we detect another process working on the lock (i.e., |
| 896 | * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller |
| 897 | * to do the right thing in that case. |
| 898 | */ |
| 899 | static int ocfs2_lock_create(struct ocfs2_super *osb, |
| 900 | struct ocfs2_lock_res *lockres, |
| 901 | int level, |
| 902 | int dlm_flags) |
| 903 | { |
| 904 | int ret = 0; |
| 905 | enum dlm_status status; |
| 906 | unsigned long flags; |
| 907 | |
| 908 | mlog_entry_void(); |
| 909 | |
| 910 | mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, |
| 911 | dlm_flags); |
| 912 | |
| 913 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 914 | if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || |
| 915 | (lockres->l_flags & OCFS2_LOCK_BUSY)) { |
| 916 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 917 | goto bail; |
| 918 | } |
| 919 | |
| 920 | lockres->l_action = OCFS2_AST_ATTACH; |
| 921 | lockres->l_requested = level; |
| 922 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 923 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 924 | |
| 925 | status = dlmlock(osb->dlm, |
| 926 | level, |
| 927 | &lockres->l_lksb, |
| 928 | dlm_flags, |
| 929 | lockres->l_name, |
Mark Fasheh | f068106 | 2006-09-08 11:40:10 -0700 | [diff] [blame] | 930 | OCFS2_LOCK_ID_MAX_LEN - 1, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 931 | lockres->l_ops->ast, |
| 932 | lockres, |
| 933 | lockres->l_ops->bast); |
| 934 | if (status != DLM_NORMAL) { |
| 935 | ocfs2_log_dlm_error("dlmlock", status, lockres); |
| 936 | ret = -EINVAL; |
| 937 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 938 | } |
| 939 | |
| 940 | mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); |
| 941 | |
| 942 | bail: |
| 943 | mlog_exit(ret); |
| 944 | return ret; |
| 945 | } |
| 946 | |
| 947 | static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, |
| 948 | int flag) |
| 949 | { |
| 950 | unsigned long flags; |
| 951 | int ret; |
| 952 | |
| 953 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 954 | ret = lockres->l_flags & flag; |
| 955 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 956 | |
| 957 | return ret; |
| 958 | } |
| 959 | |
| 960 | static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) |
| 961 | |
| 962 | { |
| 963 | wait_event(lockres->l_event, |
| 964 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); |
| 965 | } |
| 966 | |
| 967 | static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) |
| 968 | |
| 969 | { |
| 970 | wait_event(lockres->l_event, |
| 971 | !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); |
| 972 | } |
| 973 | |
| 974 | /* predict what lock level we'll be dropping down to on behalf |
| 975 | * of another node, and return true if the currently wanted |
| 976 | * level will be compatible with it. */ |
| 977 | static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, |
| 978 | int wanted) |
| 979 | { |
| 980 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 981 | |
| 982 | return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 983 | } |
| 984 | |
| 985 | static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) |
| 986 | { |
| 987 | INIT_LIST_HEAD(&mw->mw_item); |
| 988 | init_completion(&mw->mw_complete); |
| 989 | } |
| 990 | |
| 991 | static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) |
| 992 | { |
| 993 | wait_for_completion(&mw->mw_complete); |
| 994 | /* Re-arm the completion in case we want to wait on it again */ |
| 995 | INIT_COMPLETION(mw->mw_complete); |
| 996 | return mw->mw_status; |
| 997 | } |
| 998 | |
| 999 | static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, |
| 1000 | struct ocfs2_mask_waiter *mw, |
| 1001 | unsigned long mask, |
| 1002 | unsigned long goal) |
| 1003 | { |
| 1004 | BUG_ON(!list_empty(&mw->mw_item)); |
| 1005 | |
| 1006 | assert_spin_locked(&lockres->l_lock); |
| 1007 | |
| 1008 | list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); |
| 1009 | mw->mw_mask = mask; |
| 1010 | mw->mw_goal = goal; |
| 1011 | } |
| 1012 | |
| 1013 | /* returns 0 if the mw that was removed was already satisfied, -EBUSY |
| 1014 | * if the mask still hadn't reached its goal */ |
| 1015 | static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, |
| 1016 | struct ocfs2_mask_waiter *mw) |
| 1017 | { |
| 1018 | unsigned long flags; |
| 1019 | int ret = 0; |
| 1020 | |
| 1021 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1022 | if (!list_empty(&mw->mw_item)) { |
| 1023 | if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) |
| 1024 | ret = -EBUSY; |
| 1025 | |
| 1026 | list_del_init(&mw->mw_item); |
| 1027 | init_completion(&mw->mw_complete); |
| 1028 | } |
| 1029 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1030 | |
| 1031 | return ret; |
| 1032 | |
| 1033 | } |
| 1034 | |
| 1035 | static int ocfs2_cluster_lock(struct ocfs2_super *osb, |
| 1036 | struct ocfs2_lock_res *lockres, |
| 1037 | int level, |
| 1038 | int lkm_flags, |
| 1039 | int arg_flags) |
| 1040 | { |
| 1041 | struct ocfs2_mask_waiter mw; |
| 1042 | enum dlm_status status; |
| 1043 | int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); |
| 1044 | int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ |
| 1045 | unsigned long flags; |
| 1046 | |
| 1047 | mlog_entry_void(); |
| 1048 | |
| 1049 | ocfs2_init_mask_waiter(&mw); |
| 1050 | |
| 1051 | again: |
| 1052 | wait = 0; |
| 1053 | |
| 1054 | if (catch_signals && signal_pending(current)) { |
| 1055 | ret = -ERESTARTSYS; |
| 1056 | goto out; |
| 1057 | } |
| 1058 | |
| 1059 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1060 | |
| 1061 | mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, |
| 1062 | "Cluster lock called on freeing lockres %s! flags " |
| 1063 | "0x%lx\n", lockres->l_name, lockres->l_flags); |
| 1064 | |
| 1065 | /* We only compare against the currently granted level |
| 1066 | * here. If the lock is blocked waiting on a downconvert, |
| 1067 | * we'll get caught below. */ |
| 1068 | if (lockres->l_flags & OCFS2_LOCK_BUSY && |
| 1069 | level > lockres->l_level) { |
| 1070 | /* is someone sitting in dlm_lock? If so, wait on |
| 1071 | * them. */ |
| 1072 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); |
| 1073 | wait = 1; |
| 1074 | goto unlock; |
| 1075 | } |
| 1076 | |
| 1077 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
| 1078 | /* lock has not been created yet. */ |
| 1079 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1080 | |
| 1081 | ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); |
| 1082 | if (ret < 0) { |
| 1083 | mlog_errno(ret); |
| 1084 | goto out; |
| 1085 | } |
| 1086 | goto again; |
| 1087 | } |
| 1088 | |
| 1089 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED && |
| 1090 | !ocfs2_may_continue_on_blocked_lock(lockres, level)) { |
| 1091 | /* is the lock is currently blocked on behalf of |
| 1092 | * another node */ |
| 1093 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); |
| 1094 | wait = 1; |
| 1095 | goto unlock; |
| 1096 | } |
| 1097 | |
| 1098 | if (level > lockres->l_level) { |
| 1099 | if (lockres->l_action != OCFS2_AST_INVALID) |
| 1100 | mlog(ML_ERROR, "lockres %s has action %u pending\n", |
| 1101 | lockres->l_name, lockres->l_action); |
| 1102 | |
| 1103 | lockres->l_action = OCFS2_AST_CONVERT; |
| 1104 | lockres->l_requested = level; |
| 1105 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 1106 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1107 | |
| 1108 | BUG_ON(level == LKM_IVMODE); |
| 1109 | BUG_ON(level == LKM_NLMODE); |
| 1110 | |
| 1111 | mlog(0, "lock %s, convert from %d to level = %d\n", |
| 1112 | lockres->l_name, lockres->l_level, level); |
| 1113 | |
| 1114 | /* call dlm_lock to upgrade lock now */ |
| 1115 | status = dlmlock(osb->dlm, |
| 1116 | level, |
| 1117 | &lockres->l_lksb, |
| 1118 | lkm_flags|LKM_CONVERT|LKM_VALBLK, |
| 1119 | lockres->l_name, |
Mark Fasheh | f068106 | 2006-09-08 11:40:10 -0700 | [diff] [blame] | 1120 | OCFS2_LOCK_ID_MAX_LEN - 1, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1121 | lockres->l_ops->ast, |
| 1122 | lockres, |
| 1123 | lockres->l_ops->bast); |
| 1124 | if (status != DLM_NORMAL) { |
| 1125 | if ((lkm_flags & LKM_NOQUEUE) && |
| 1126 | (status == DLM_NOTQUEUED)) |
| 1127 | ret = -EAGAIN; |
| 1128 | else { |
| 1129 | ocfs2_log_dlm_error("dlmlock", status, |
| 1130 | lockres); |
| 1131 | ret = -EINVAL; |
| 1132 | } |
| 1133 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 1134 | goto out; |
| 1135 | } |
| 1136 | |
| 1137 | mlog(0, "lock %s, successfull return from dlmlock\n", |
| 1138 | lockres->l_name); |
| 1139 | |
| 1140 | /* At this point we've gone inside the dlm and need to |
| 1141 | * complete our work regardless. */ |
| 1142 | catch_signals = 0; |
| 1143 | |
| 1144 | /* wait for busy to clear and carry on */ |
| 1145 | goto again; |
| 1146 | } |
| 1147 | |
| 1148 | /* Ok, if we get here then we're good to go. */ |
| 1149 | ocfs2_inc_holders(lockres, level); |
| 1150 | |
| 1151 | ret = 0; |
| 1152 | unlock: |
| 1153 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1154 | out: |
| 1155 | /* |
| 1156 | * This is helping work around a lock inversion between the page lock |
| 1157 | * and dlm locks. One path holds the page lock while calling aops |
| 1158 | * which block acquiring dlm locks. The voting thread holds dlm |
| 1159 | * locks while acquiring page locks while down converting data locks. |
| 1160 | * This block is helping an aop path notice the inversion and back |
| 1161 | * off to unlock its page lock before trying the dlm lock again. |
| 1162 | */ |
| 1163 | if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && |
| 1164 | mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { |
| 1165 | wait = 0; |
| 1166 | if (lockres_remove_mask_waiter(lockres, &mw)) |
| 1167 | ret = -EAGAIN; |
| 1168 | else |
| 1169 | goto again; |
| 1170 | } |
| 1171 | if (wait) { |
| 1172 | ret = ocfs2_wait_for_mask(&mw); |
| 1173 | if (ret == 0) |
| 1174 | goto again; |
| 1175 | mlog_errno(ret); |
| 1176 | } |
| 1177 | |
| 1178 | mlog_exit(ret); |
| 1179 | return ret; |
| 1180 | } |
| 1181 | |
| 1182 | static void ocfs2_cluster_unlock(struct ocfs2_super *osb, |
| 1183 | struct ocfs2_lock_res *lockres, |
| 1184 | int level) |
| 1185 | { |
| 1186 | unsigned long flags; |
| 1187 | |
| 1188 | mlog_entry_void(); |
| 1189 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1190 | ocfs2_dec_holders(lockres, level); |
| 1191 | ocfs2_vote_on_unlock(osb, lockres); |
| 1192 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1193 | mlog_exit_void(); |
| 1194 | } |
| 1195 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 1196 | int ocfs2_create_new_lock(struct ocfs2_super *osb, |
| 1197 | struct ocfs2_lock_res *lockres, |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1198 | int ex, |
| 1199 | int local) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1200 | { |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 1201 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1202 | unsigned long flags; |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1203 | int lkm_flags = local ? LKM_LOCAL : 0; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1204 | |
| 1205 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1206 | BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); |
| 1207 | lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); |
| 1208 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1209 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1210 | return ocfs2_lock_create(osb, lockres, level, lkm_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1211 | } |
| 1212 | |
| 1213 | /* Grants us an EX lock on the data and metadata resources, skipping |
| 1214 | * the normal cluster directory lookup. Use this ONLY on newly created |
| 1215 | * inodes which other nodes can't possibly see, and which haven't been |
| 1216 | * hashed in the inode hash yet. This can give us a good performance |
| 1217 | * increase as it'll skip the network broadcast normally associated |
| 1218 | * with creating a new lock resource. */ |
| 1219 | int ocfs2_create_new_inode_locks(struct inode *inode) |
| 1220 | { |
| 1221 | int ret; |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 1222 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1223 | |
| 1224 | BUG_ON(!inode); |
| 1225 | BUG_ON(!ocfs2_inode_is_new(inode)); |
| 1226 | |
| 1227 | mlog_entry_void(); |
| 1228 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1229 | mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1230 | |
| 1231 | /* NOTE: That we don't increment any of the holder counts, nor |
| 1232 | * do we add anything to a journal handle. Since this is |
| 1233 | * supposed to be a new inode which the cluster doesn't know |
| 1234 | * about yet, there is no need to. As far as the LVB handling |
| 1235 | * is concerned, this is basically like acquiring an EX lock |
| 1236 | * on a resource which has an invalid one -- we'll set it |
| 1237 | * valid when we release the EX. */ |
| 1238 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1239 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1240 | if (ret) { |
| 1241 | mlog_errno(ret); |
| 1242 | goto bail; |
| 1243 | } |
| 1244 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1245 | /* |
| 1246 | * We don't want to use LKM_LOCAL on a meta data lock as they |
| 1247 | * don't use a generation in their lock names. |
| 1248 | */ |
| 1249 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1250 | if (ret) { |
| 1251 | mlog_errno(ret); |
| 1252 | goto bail; |
| 1253 | } |
| 1254 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1255 | ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1256 | if (ret) { |
| 1257 | mlog_errno(ret); |
| 1258 | goto bail; |
| 1259 | } |
| 1260 | |
| 1261 | bail: |
| 1262 | mlog_exit(ret); |
| 1263 | return ret; |
| 1264 | } |
| 1265 | |
| 1266 | int ocfs2_rw_lock(struct inode *inode, int write) |
| 1267 | { |
| 1268 | int status, level; |
| 1269 | struct ocfs2_lock_res *lockres; |
| 1270 | |
| 1271 | BUG_ON(!inode); |
| 1272 | |
| 1273 | mlog_entry_void(); |
| 1274 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1275 | mlog(0, "inode %llu take %s RW lock\n", |
| 1276 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1277 | write ? "EXMODE" : "PRMODE"); |
| 1278 | |
| 1279 | lockres = &OCFS2_I(inode)->ip_rw_lockres; |
| 1280 | |
| 1281 | level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1282 | |
| 1283 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, |
| 1284 | 0); |
| 1285 | if (status < 0) |
| 1286 | mlog_errno(status); |
| 1287 | |
| 1288 | mlog_exit(status); |
| 1289 | return status; |
| 1290 | } |
| 1291 | |
| 1292 | void ocfs2_rw_unlock(struct inode *inode, int write) |
| 1293 | { |
| 1294 | int level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1295 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; |
| 1296 | |
| 1297 | mlog_entry_void(); |
| 1298 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1299 | mlog(0, "inode %llu drop %s RW lock\n", |
| 1300 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1301 | write ? "EXMODE" : "PRMODE"); |
| 1302 | |
| 1303 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1304 | |
| 1305 | mlog_exit_void(); |
| 1306 | } |
| 1307 | |
| 1308 | int ocfs2_data_lock_full(struct inode *inode, |
| 1309 | int write, |
| 1310 | int arg_flags) |
| 1311 | { |
| 1312 | int status = 0, level; |
| 1313 | struct ocfs2_lock_res *lockres; |
| 1314 | |
| 1315 | BUG_ON(!inode); |
| 1316 | |
| 1317 | mlog_entry_void(); |
| 1318 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1319 | mlog(0, "inode %llu take %s DATA lock\n", |
| 1320 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1321 | write ? "EXMODE" : "PRMODE"); |
| 1322 | |
| 1323 | /* We'll allow faking a readonly data lock for |
| 1324 | * rodevices. */ |
| 1325 | if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { |
| 1326 | if (write) { |
| 1327 | status = -EROFS; |
| 1328 | mlog_errno(status); |
| 1329 | } |
| 1330 | goto out; |
| 1331 | } |
| 1332 | |
| 1333 | lockres = &OCFS2_I(inode)->ip_data_lockres; |
| 1334 | |
| 1335 | level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1336 | |
| 1337 | status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, |
| 1338 | 0, arg_flags); |
| 1339 | if (status < 0 && status != -EAGAIN) |
| 1340 | mlog_errno(status); |
| 1341 | |
| 1342 | out: |
| 1343 | mlog_exit(status); |
| 1344 | return status; |
| 1345 | } |
| 1346 | |
| 1347 | /* see ocfs2_meta_lock_with_page() */ |
| 1348 | int ocfs2_data_lock_with_page(struct inode *inode, |
| 1349 | int write, |
| 1350 | struct page *page) |
| 1351 | { |
| 1352 | int ret; |
| 1353 | |
| 1354 | ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); |
| 1355 | if (ret == -EAGAIN) { |
| 1356 | unlock_page(page); |
| 1357 | if (ocfs2_data_lock(inode, write) == 0) |
| 1358 | ocfs2_data_unlock(inode, write); |
| 1359 | ret = AOP_TRUNCATED_PAGE; |
| 1360 | } |
| 1361 | |
| 1362 | return ret; |
| 1363 | } |
| 1364 | |
| 1365 | static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, |
| 1366 | struct ocfs2_lock_res *lockres) |
| 1367 | { |
| 1368 | int kick = 0; |
| 1369 | |
| 1370 | mlog_entry_void(); |
| 1371 | |
| 1372 | /* If we know that another node is waiting on our lock, kick |
| 1373 | * the vote thread * pre-emptively when we reach a release |
| 1374 | * condition. */ |
| 1375 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { |
| 1376 | switch(lockres->l_blocking) { |
| 1377 | case LKM_EXMODE: |
| 1378 | if (!lockres->l_ex_holders && !lockres->l_ro_holders) |
| 1379 | kick = 1; |
| 1380 | break; |
| 1381 | case LKM_PRMODE: |
| 1382 | if (!lockres->l_ex_holders) |
| 1383 | kick = 1; |
| 1384 | break; |
| 1385 | default: |
| 1386 | BUG(); |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | if (kick) |
| 1391 | ocfs2_kick_vote_thread(osb); |
| 1392 | |
| 1393 | mlog_exit_void(); |
| 1394 | } |
| 1395 | |
| 1396 | void ocfs2_data_unlock(struct inode *inode, |
| 1397 | int write) |
| 1398 | { |
| 1399 | int level = write ? LKM_EXMODE : LKM_PRMODE; |
| 1400 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; |
| 1401 | |
| 1402 | mlog_entry_void(); |
| 1403 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1404 | mlog(0, "inode %llu drop %s DATA lock\n", |
| 1405 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1406 | write ? "EXMODE" : "PRMODE"); |
| 1407 | |
| 1408 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) |
| 1409 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1410 | |
| 1411 | mlog_exit_void(); |
| 1412 | } |
| 1413 | |
| 1414 | #define OCFS2_SEC_BITS 34 |
| 1415 | #define OCFS2_SEC_SHIFT (64 - 34) |
| 1416 | #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) |
| 1417 | |
| 1418 | /* LVB only has room for 64 bits of time here so we pack it for |
| 1419 | * now. */ |
| 1420 | static u64 ocfs2_pack_timespec(struct timespec *spec) |
| 1421 | { |
| 1422 | u64 res; |
| 1423 | u64 sec = spec->tv_sec; |
| 1424 | u32 nsec = spec->tv_nsec; |
| 1425 | |
| 1426 | res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); |
| 1427 | |
| 1428 | return res; |
| 1429 | } |
| 1430 | |
| 1431 | /* Call this with the lockres locked. I am reasonably sure we don't |
| 1432 | * need ip_lock in this function as anyone who would be changing those |
| 1433 | * values is supposed to be blocked in ocfs2_meta_lock right now. */ |
| 1434 | static void __ocfs2_stuff_meta_lvb(struct inode *inode) |
| 1435 | { |
| 1436 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1437 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; |
| 1438 | struct ocfs2_meta_lvb *lvb; |
| 1439 | |
| 1440 | mlog_entry_void(); |
| 1441 | |
| 1442 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1443 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1444 | /* |
| 1445 | * Invalidate the LVB of a deleted inode - this way other |
| 1446 | * nodes are forced to go to disk and discover the new inode |
| 1447 | * status. |
| 1448 | */ |
| 1449 | if (oi->ip_flags & OCFS2_INODE_DELETED) { |
| 1450 | lvb->lvb_version = 0; |
| 1451 | goto out; |
| 1452 | } |
| 1453 | |
Mark Fasheh | 4d3b83f | 2006-09-12 15:22:18 -0700 | [diff] [blame] | 1454 | lvb->lvb_version = OCFS2_LVB_VERSION; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1455 | lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); |
| 1456 | lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); |
| 1457 | lvb->lvb_iuid = cpu_to_be32(inode->i_uid); |
| 1458 | lvb->lvb_igid = cpu_to_be32(inode->i_gid); |
| 1459 | lvb->lvb_imode = cpu_to_be16(inode->i_mode); |
| 1460 | lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); |
| 1461 | lvb->lvb_iatime_packed = |
| 1462 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); |
| 1463 | lvb->lvb_ictime_packed = |
| 1464 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); |
| 1465 | lvb->lvb_imtime_packed = |
| 1466 | cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); |
Herbert Poetzl | ca4d147 | 2006-07-03 17:27:12 -0700 | [diff] [blame] | 1467 | lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); |
Mark Fasheh | f9e2d82 | 2006-09-12 15:35:49 -0700 | [diff] [blame] | 1468 | lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1469 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1470 | out: |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1471 | mlog_meta_lvb(0, lockres); |
| 1472 | |
| 1473 | mlog_exit_void(); |
| 1474 | } |
| 1475 | |
| 1476 | static void ocfs2_unpack_timespec(struct timespec *spec, |
| 1477 | u64 packed_time) |
| 1478 | { |
| 1479 | spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; |
| 1480 | spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; |
| 1481 | } |
| 1482 | |
| 1483 | static void ocfs2_refresh_inode_from_lvb(struct inode *inode) |
| 1484 | { |
| 1485 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1486 | struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; |
| 1487 | struct ocfs2_meta_lvb *lvb; |
| 1488 | |
| 1489 | mlog_entry_void(); |
| 1490 | |
| 1491 | mlog_meta_lvb(0, lockres); |
| 1492 | |
| 1493 | lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1494 | |
| 1495 | /* We're safe here without the lockres lock... */ |
| 1496 | spin_lock(&oi->ip_lock); |
| 1497 | oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); |
| 1498 | i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); |
| 1499 | |
Herbert Poetzl | ca4d147 | 2006-07-03 17:27:12 -0700 | [diff] [blame] | 1500 | oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); |
| 1501 | ocfs2_set_inode_flags(inode); |
| 1502 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1503 | /* fast-symlinks are a special case */ |
| 1504 | if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) |
| 1505 | inode->i_blocks = 0; |
| 1506 | else |
| 1507 | inode->i_blocks = |
| 1508 | ocfs2_align_bytes_to_sectors(i_size_read(inode)); |
| 1509 | |
| 1510 | inode->i_uid = be32_to_cpu(lvb->lvb_iuid); |
| 1511 | inode->i_gid = be32_to_cpu(lvb->lvb_igid); |
| 1512 | inode->i_mode = be16_to_cpu(lvb->lvb_imode); |
| 1513 | inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); |
| 1514 | ocfs2_unpack_timespec(&inode->i_atime, |
| 1515 | be64_to_cpu(lvb->lvb_iatime_packed)); |
| 1516 | ocfs2_unpack_timespec(&inode->i_mtime, |
| 1517 | be64_to_cpu(lvb->lvb_imtime_packed)); |
| 1518 | ocfs2_unpack_timespec(&inode->i_ctime, |
| 1519 | be64_to_cpu(lvb->lvb_ictime_packed)); |
| 1520 | spin_unlock(&oi->ip_lock); |
| 1521 | |
| 1522 | mlog_exit_void(); |
| 1523 | } |
| 1524 | |
Mark Fasheh | f9e2d82 | 2006-09-12 15:35:49 -0700 | [diff] [blame] | 1525 | static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, |
| 1526 | struct ocfs2_lock_res *lockres) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1527 | { |
| 1528 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 1529 | |
Mark Fasheh | f9e2d82 | 2006-09-12 15:35:49 -0700 | [diff] [blame] | 1530 | if (lvb->lvb_version == OCFS2_LVB_VERSION |
| 1531 | && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1532 | return 1; |
| 1533 | return 0; |
| 1534 | } |
| 1535 | |
| 1536 | /* Determine whether a lock resource needs to be refreshed, and |
| 1537 | * arbitrate who gets to refresh it. |
| 1538 | * |
| 1539 | * 0 means no refresh needed. |
| 1540 | * |
| 1541 | * > 0 means you need to refresh this and you MUST call |
| 1542 | * ocfs2_complete_lock_res_refresh afterwards. */ |
| 1543 | static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) |
| 1544 | { |
| 1545 | unsigned long flags; |
| 1546 | int status = 0; |
| 1547 | |
| 1548 | mlog_entry_void(); |
| 1549 | |
| 1550 | refresh_check: |
| 1551 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1552 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { |
| 1553 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1554 | goto bail; |
| 1555 | } |
| 1556 | |
| 1557 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { |
| 1558 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1559 | |
| 1560 | ocfs2_wait_on_refreshing_lock(lockres); |
| 1561 | goto refresh_check; |
| 1562 | } |
| 1563 | |
| 1564 | /* Ok, I'll be the one to refresh this lock. */ |
| 1565 | lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); |
| 1566 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1567 | |
| 1568 | status = 1; |
| 1569 | bail: |
| 1570 | mlog_exit(status); |
| 1571 | return status; |
| 1572 | } |
| 1573 | |
| 1574 | /* If status is non zero, I'll mark it as not being in refresh |
| 1575 | * anymroe, but i won't clear the needs refresh flag. */ |
| 1576 | static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, |
| 1577 | int status) |
| 1578 | { |
| 1579 | unsigned long flags; |
| 1580 | mlog_entry_void(); |
| 1581 | |
| 1582 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 1583 | lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); |
| 1584 | if (!status) |
| 1585 | lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); |
| 1586 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 1587 | |
| 1588 | wake_up(&lockres->l_event); |
| 1589 | |
| 1590 | mlog_exit_void(); |
| 1591 | } |
| 1592 | |
| 1593 | /* may or may not return a bh if it went to disk. */ |
| 1594 | static int ocfs2_meta_lock_update(struct inode *inode, |
| 1595 | struct buffer_head **bh) |
| 1596 | { |
| 1597 | int status = 0; |
| 1598 | struct ocfs2_inode_info *oi = OCFS2_I(inode); |
| 1599 | struct ocfs2_lock_res *lockres; |
| 1600 | struct ocfs2_dinode *fe; |
| 1601 | |
| 1602 | mlog_entry_void(); |
| 1603 | |
| 1604 | spin_lock(&oi->ip_lock); |
| 1605 | if (oi->ip_flags & OCFS2_INODE_DELETED) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1606 | mlog(0, "Orphaned inode %llu was deleted while we " |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1607 | "were waiting on a lock. ip_flags = 0x%x\n", |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1608 | (unsigned long long)oi->ip_blkno, oi->ip_flags); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1609 | spin_unlock(&oi->ip_lock); |
| 1610 | status = -ENOENT; |
| 1611 | goto bail; |
| 1612 | } |
| 1613 | spin_unlock(&oi->ip_lock); |
| 1614 | |
| 1615 | lockres = &oi->ip_meta_lockres; |
| 1616 | |
| 1617 | if (!ocfs2_should_refresh_lock_res(lockres)) |
| 1618 | goto bail; |
| 1619 | |
| 1620 | /* This will discard any caching information we might have had |
| 1621 | * for the inode metadata. */ |
| 1622 | ocfs2_metadata_cache_purge(inode); |
| 1623 | |
| 1624 | /* will do nothing for inode types that don't use the extent |
| 1625 | * map (directories, bitmap files, etc) */ |
| 1626 | ocfs2_extent_map_trunc(inode, 0); |
| 1627 | |
Mark Fasheh | f9e2d82 | 2006-09-12 15:35:49 -0700 | [diff] [blame] | 1628 | if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1629 | mlog(0, "Trusting LVB on inode %llu\n", |
| 1630 | (unsigned long long)oi->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1631 | ocfs2_refresh_inode_from_lvb(inode); |
| 1632 | } else { |
| 1633 | /* Boo, we have to go to disk. */ |
| 1634 | /* read bh, cast, ocfs2_refresh_inode */ |
| 1635 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, |
| 1636 | bh, OCFS2_BH_CACHED, inode); |
| 1637 | if (status < 0) { |
| 1638 | mlog_errno(status); |
| 1639 | goto bail_refresh; |
| 1640 | } |
| 1641 | fe = (struct ocfs2_dinode *) (*bh)->b_data; |
| 1642 | |
| 1643 | /* This is a good chance to make sure we're not |
| 1644 | * locking an invalid object. |
| 1645 | * |
| 1646 | * We bug on a stale inode here because we checked |
| 1647 | * above whether it was wiped from disk. The wiping |
| 1648 | * node provides a guarantee that we receive that |
| 1649 | * message and can mark the inode before dropping any |
| 1650 | * locks associated with it. */ |
| 1651 | if (!OCFS2_IS_VALID_DINODE(fe)) { |
| 1652 | OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); |
| 1653 | status = -EIO; |
| 1654 | goto bail_refresh; |
| 1655 | } |
| 1656 | mlog_bug_on_msg(inode->i_generation != |
| 1657 | le32_to_cpu(fe->i_generation), |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1658 | "Invalid dinode %llu disk generation: %u " |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1659 | "inode->i_generation: %u\n", |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1660 | (unsigned long long)oi->ip_blkno, |
| 1661 | le32_to_cpu(fe->i_generation), |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1662 | inode->i_generation); |
| 1663 | mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || |
| 1664 | !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1665 | "Stale dinode %llu dtime: %llu flags: 0x%x\n", |
| 1666 | (unsigned long long)oi->ip_blkno, |
| 1667 | (unsigned long long)le64_to_cpu(fe->i_dtime), |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1668 | le32_to_cpu(fe->i_flags)); |
| 1669 | |
| 1670 | ocfs2_refresh_inode(inode, fe); |
| 1671 | } |
| 1672 | |
| 1673 | status = 0; |
| 1674 | bail_refresh: |
| 1675 | ocfs2_complete_lock_res_refresh(lockres, status); |
| 1676 | bail: |
| 1677 | mlog_exit(status); |
| 1678 | return status; |
| 1679 | } |
| 1680 | |
| 1681 | static int ocfs2_assign_bh(struct inode *inode, |
| 1682 | struct buffer_head **ret_bh, |
| 1683 | struct buffer_head *passed_bh) |
| 1684 | { |
| 1685 | int status; |
| 1686 | |
| 1687 | if (passed_bh) { |
| 1688 | /* Ok, the update went to disk for us, use the |
| 1689 | * returned bh. */ |
| 1690 | *ret_bh = passed_bh; |
| 1691 | get_bh(*ret_bh); |
| 1692 | |
| 1693 | return 0; |
| 1694 | } |
| 1695 | |
| 1696 | status = ocfs2_read_block(OCFS2_SB(inode->i_sb), |
| 1697 | OCFS2_I(inode)->ip_blkno, |
| 1698 | ret_bh, |
| 1699 | OCFS2_BH_CACHED, |
| 1700 | inode); |
| 1701 | if (status < 0) |
| 1702 | mlog_errno(status); |
| 1703 | |
| 1704 | return status; |
| 1705 | } |
| 1706 | |
| 1707 | /* |
| 1708 | * returns < 0 error if the callback will never be called, otherwise |
| 1709 | * the result of the lock will be communicated via the callback. |
| 1710 | */ |
| 1711 | int ocfs2_meta_lock_full(struct inode *inode, |
| 1712 | struct ocfs2_journal_handle *handle, |
| 1713 | struct buffer_head **ret_bh, |
| 1714 | int ex, |
| 1715 | int arg_flags) |
| 1716 | { |
| 1717 | int status, level, dlm_flags, acquired; |
| 1718 | struct ocfs2_lock_res *lockres; |
| 1719 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 1720 | struct buffer_head *local_bh = NULL; |
| 1721 | |
| 1722 | BUG_ON(!inode); |
| 1723 | |
| 1724 | mlog_entry_void(); |
| 1725 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1726 | mlog(0, "inode %llu, take %s META lock\n", |
| 1727 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1728 | ex ? "EXMODE" : "PRMODE"); |
| 1729 | |
| 1730 | status = 0; |
| 1731 | acquired = 0; |
| 1732 | /* We'll allow faking a readonly metadata lock for |
| 1733 | * rodevices. */ |
| 1734 | if (ocfs2_is_hard_readonly(osb)) { |
| 1735 | if (ex) |
| 1736 | status = -EROFS; |
| 1737 | goto bail; |
| 1738 | } |
| 1739 | |
| 1740 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
| 1741 | wait_event(osb->recovery_event, |
| 1742 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); |
| 1743 | |
| 1744 | acquired = 0; |
| 1745 | lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 1746 | level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1747 | dlm_flags = 0; |
| 1748 | if (arg_flags & OCFS2_META_LOCK_NOQUEUE) |
| 1749 | dlm_flags |= LKM_NOQUEUE; |
| 1750 | |
| 1751 | status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); |
| 1752 | if (status < 0) { |
| 1753 | if (status != -EAGAIN && status != -EIOCBRETRY) |
| 1754 | mlog_errno(status); |
| 1755 | goto bail; |
| 1756 | } |
| 1757 | |
| 1758 | /* Notify the error cleanup path to drop the cluster lock. */ |
| 1759 | acquired = 1; |
| 1760 | |
| 1761 | /* We wait twice because a node may have died while we were in |
| 1762 | * the lower dlm layers. The second time though, we've |
| 1763 | * committed to owning this lock so we don't allow signals to |
| 1764 | * abort the operation. */ |
| 1765 | if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) |
| 1766 | wait_event(osb->recovery_event, |
| 1767 | ocfs2_node_map_is_empty(osb, &osb->recovery_map)); |
| 1768 | |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 1769 | /* |
| 1770 | * We only see this flag if we're being called from |
| 1771 | * ocfs2_read_locked_inode(). It means we're locking an inode |
| 1772 | * which hasn't been populated yet, so clear the refresh flag |
| 1773 | * and let the caller handle it. |
| 1774 | */ |
| 1775 | if (inode->i_state & I_NEW) { |
| 1776 | status = 0; |
| 1777 | ocfs2_complete_lock_res_refresh(lockres, 0); |
| 1778 | goto bail; |
| 1779 | } |
| 1780 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1781 | /* This is fun. The caller may want a bh back, or it may |
| 1782 | * not. ocfs2_meta_lock_update definitely wants one in, but |
| 1783 | * may or may not read one, depending on what's in the |
| 1784 | * LVB. The result of all of this is that we've *only* gone to |
| 1785 | * disk if we have to, so the complexity is worthwhile. */ |
| 1786 | status = ocfs2_meta_lock_update(inode, &local_bh); |
| 1787 | if (status < 0) { |
| 1788 | if (status != -ENOENT) |
| 1789 | mlog_errno(status); |
| 1790 | goto bail; |
| 1791 | } |
| 1792 | |
| 1793 | if (ret_bh) { |
| 1794 | status = ocfs2_assign_bh(inode, ret_bh, local_bh); |
| 1795 | if (status < 0) { |
| 1796 | mlog_errno(status); |
| 1797 | goto bail; |
| 1798 | } |
| 1799 | } |
| 1800 | |
| 1801 | if (handle) { |
| 1802 | status = ocfs2_handle_add_lock(handle, inode); |
| 1803 | if (status < 0) |
| 1804 | mlog_errno(status); |
| 1805 | } |
| 1806 | |
| 1807 | bail: |
| 1808 | if (status < 0) { |
| 1809 | if (ret_bh && (*ret_bh)) { |
| 1810 | brelse(*ret_bh); |
| 1811 | *ret_bh = NULL; |
| 1812 | } |
| 1813 | if (acquired) |
| 1814 | ocfs2_meta_unlock(inode, ex); |
| 1815 | } |
| 1816 | |
| 1817 | if (local_bh) |
| 1818 | brelse(local_bh); |
| 1819 | |
| 1820 | mlog_exit(status); |
| 1821 | return status; |
| 1822 | } |
| 1823 | |
| 1824 | /* |
| 1825 | * This is working around a lock inversion between tasks acquiring DLM locks |
| 1826 | * while holding a page lock and the vote thread which blocks dlm lock acquiry |
| 1827 | * while acquiring page locks. |
| 1828 | * |
| 1829 | * ** These _with_page variantes are only intended to be called from aop |
| 1830 | * methods that hold page locks and return a very specific *positive* error |
| 1831 | * code that aop methods pass up to the VFS -- test for errors with != 0. ** |
| 1832 | * |
| 1833 | * The DLM is called such that it returns -EAGAIN if it would have blocked |
| 1834 | * waiting for the vote thread. In that case we unlock our page so the vote |
| 1835 | * thread can make progress. Once we've done this we have to return |
| 1836 | * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up |
| 1837 | * into the VFS who will then immediately retry the aop call. |
| 1838 | * |
| 1839 | * We do a blocking lock and immediate unlock before returning, though, so that |
| 1840 | * the lock has a great chance of being cached on this node by the time the VFS |
| 1841 | * calls back to retry the aop. This has a potential to livelock as nodes |
| 1842 | * ping locks back and forth, but that's a risk we're willing to take to avoid |
| 1843 | * the lock inversion simply. |
| 1844 | */ |
| 1845 | int ocfs2_meta_lock_with_page(struct inode *inode, |
| 1846 | struct ocfs2_journal_handle *handle, |
| 1847 | struct buffer_head **ret_bh, |
| 1848 | int ex, |
| 1849 | struct page *page) |
| 1850 | { |
| 1851 | int ret; |
| 1852 | |
| 1853 | ret = ocfs2_meta_lock_full(inode, handle, ret_bh, ex, |
| 1854 | OCFS2_LOCK_NONBLOCK); |
| 1855 | if (ret == -EAGAIN) { |
| 1856 | unlock_page(page); |
| 1857 | if (ocfs2_meta_lock(inode, handle, ret_bh, ex) == 0) |
| 1858 | ocfs2_meta_unlock(inode, ex); |
| 1859 | ret = AOP_TRUNCATED_PAGE; |
| 1860 | } |
| 1861 | |
| 1862 | return ret; |
| 1863 | } |
| 1864 | |
| 1865 | void ocfs2_meta_unlock(struct inode *inode, |
| 1866 | int ex) |
| 1867 | { |
| 1868 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1869 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 1870 | |
| 1871 | mlog_entry_void(); |
| 1872 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 1873 | mlog(0, "inode %llu drop %s META lock\n", |
| 1874 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1875 | ex ? "EXMODE" : "PRMODE"); |
| 1876 | |
| 1877 | if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) |
| 1878 | ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); |
| 1879 | |
| 1880 | mlog_exit_void(); |
| 1881 | } |
| 1882 | |
| 1883 | int ocfs2_super_lock(struct ocfs2_super *osb, |
| 1884 | int ex) |
| 1885 | { |
| 1886 | int status; |
| 1887 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1888 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
| 1889 | struct buffer_head *bh; |
| 1890 | struct ocfs2_slot_info *si = osb->slot_info; |
| 1891 | |
| 1892 | mlog_entry_void(); |
| 1893 | |
| 1894 | if (ocfs2_is_hard_readonly(osb)) |
| 1895 | return -EROFS; |
| 1896 | |
| 1897 | status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); |
| 1898 | if (status < 0) { |
| 1899 | mlog_errno(status); |
| 1900 | goto bail; |
| 1901 | } |
| 1902 | |
| 1903 | /* The super block lock path is really in the best position to |
| 1904 | * know when resources covered by the lock need to be |
| 1905 | * refreshed, so we do it here. Of course, making sense of |
| 1906 | * everything is up to the caller :) */ |
| 1907 | status = ocfs2_should_refresh_lock_res(lockres); |
| 1908 | if (status < 0) { |
| 1909 | mlog_errno(status); |
| 1910 | goto bail; |
| 1911 | } |
| 1912 | if (status) { |
| 1913 | bh = si->si_bh; |
| 1914 | status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, |
| 1915 | si->si_inode); |
| 1916 | if (status == 0) |
| 1917 | ocfs2_update_slot_info(si); |
| 1918 | |
| 1919 | ocfs2_complete_lock_res_refresh(lockres, status); |
| 1920 | |
| 1921 | if (status < 0) |
| 1922 | mlog_errno(status); |
| 1923 | } |
| 1924 | bail: |
| 1925 | mlog_exit(status); |
| 1926 | return status; |
| 1927 | } |
| 1928 | |
| 1929 | void ocfs2_super_unlock(struct ocfs2_super *osb, |
| 1930 | int ex) |
| 1931 | { |
| 1932 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1933 | struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; |
| 1934 | |
| 1935 | ocfs2_cluster_unlock(osb, lockres, level); |
| 1936 | } |
| 1937 | |
| 1938 | int ocfs2_rename_lock(struct ocfs2_super *osb) |
| 1939 | { |
| 1940 | int status; |
| 1941 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
| 1942 | |
| 1943 | if (ocfs2_is_hard_readonly(osb)) |
| 1944 | return -EROFS; |
| 1945 | |
| 1946 | status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); |
| 1947 | if (status < 0) |
| 1948 | mlog_errno(status); |
| 1949 | |
| 1950 | return status; |
| 1951 | } |
| 1952 | |
| 1953 | void ocfs2_rename_unlock(struct ocfs2_super *osb) |
| 1954 | { |
| 1955 | struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; |
| 1956 | |
| 1957 | ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); |
| 1958 | } |
| 1959 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 1960 | int ocfs2_dentry_lock(struct dentry *dentry, int ex) |
| 1961 | { |
| 1962 | int ret; |
| 1963 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1964 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
| 1965 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
| 1966 | |
| 1967 | BUG_ON(!dl); |
| 1968 | |
| 1969 | if (ocfs2_is_hard_readonly(osb)) |
| 1970 | return -EROFS; |
| 1971 | |
| 1972 | ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); |
| 1973 | if (ret < 0) |
| 1974 | mlog_errno(ret); |
| 1975 | |
| 1976 | return ret; |
| 1977 | } |
| 1978 | |
| 1979 | void ocfs2_dentry_unlock(struct dentry *dentry, int ex) |
| 1980 | { |
| 1981 | int level = ex ? LKM_EXMODE : LKM_PRMODE; |
| 1982 | struct ocfs2_dentry_lock *dl = dentry->d_fsdata; |
| 1983 | struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); |
| 1984 | |
| 1985 | ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); |
| 1986 | } |
| 1987 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 1988 | /* Reference counting of the dlm debug structure. We want this because |
| 1989 | * open references on the debug inodes can live on after a mount, so |
| 1990 | * we can't rely on the ocfs2_super to always exist. */ |
| 1991 | static void ocfs2_dlm_debug_free(struct kref *kref) |
| 1992 | { |
| 1993 | struct ocfs2_dlm_debug *dlm_debug; |
| 1994 | |
| 1995 | dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); |
| 1996 | |
| 1997 | kfree(dlm_debug); |
| 1998 | } |
| 1999 | |
| 2000 | void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) |
| 2001 | { |
| 2002 | if (dlm_debug) |
| 2003 | kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); |
| 2004 | } |
| 2005 | |
| 2006 | static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) |
| 2007 | { |
| 2008 | kref_get(&debug->d_refcnt); |
| 2009 | } |
| 2010 | |
| 2011 | struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) |
| 2012 | { |
| 2013 | struct ocfs2_dlm_debug *dlm_debug; |
| 2014 | |
| 2015 | dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); |
| 2016 | if (!dlm_debug) { |
| 2017 | mlog_errno(-ENOMEM); |
| 2018 | goto out; |
| 2019 | } |
| 2020 | |
| 2021 | kref_init(&dlm_debug->d_refcnt); |
| 2022 | INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); |
| 2023 | dlm_debug->d_locking_state = NULL; |
| 2024 | out: |
| 2025 | return dlm_debug; |
| 2026 | } |
| 2027 | |
| 2028 | /* Access to this is arbitrated for us via seq_file->sem. */ |
| 2029 | struct ocfs2_dlm_seq_priv { |
| 2030 | struct ocfs2_dlm_debug *p_dlm_debug; |
| 2031 | struct ocfs2_lock_res p_iter_res; |
| 2032 | struct ocfs2_lock_res p_tmp_res; |
| 2033 | }; |
| 2034 | |
| 2035 | static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, |
| 2036 | struct ocfs2_dlm_seq_priv *priv) |
| 2037 | { |
| 2038 | struct ocfs2_lock_res *iter, *ret = NULL; |
| 2039 | struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; |
| 2040 | |
| 2041 | assert_spin_locked(&ocfs2_dlm_tracking_lock); |
| 2042 | |
| 2043 | list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { |
| 2044 | /* discover the head of the list */ |
| 2045 | if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { |
| 2046 | mlog(0, "End of list found, %p\n", ret); |
| 2047 | break; |
| 2048 | } |
| 2049 | |
| 2050 | /* We track our "dummy" iteration lockres' by a NULL |
| 2051 | * l_ops field. */ |
| 2052 | if (iter->l_ops != NULL) { |
| 2053 | ret = iter; |
| 2054 | break; |
| 2055 | } |
| 2056 | } |
| 2057 | |
| 2058 | return ret; |
| 2059 | } |
| 2060 | |
| 2061 | static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) |
| 2062 | { |
| 2063 | struct ocfs2_dlm_seq_priv *priv = m->private; |
| 2064 | struct ocfs2_lock_res *iter; |
| 2065 | |
| 2066 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 2067 | iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); |
| 2068 | if (iter) { |
| 2069 | /* Since lockres' have the lifetime of their container |
| 2070 | * (which can be inodes, ocfs2_supers, etc) we want to |
| 2071 | * copy this out to a temporary lockres while still |
| 2072 | * under the spinlock. Obviously after this we can't |
| 2073 | * trust any pointers on the copy returned, but that's |
| 2074 | * ok as the information we want isn't typically held |
| 2075 | * in them. */ |
| 2076 | priv->p_tmp_res = *iter; |
| 2077 | iter = &priv->p_tmp_res; |
| 2078 | } |
| 2079 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 2080 | |
| 2081 | return iter; |
| 2082 | } |
| 2083 | |
| 2084 | static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) |
| 2085 | { |
| 2086 | } |
| 2087 | |
| 2088 | static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) |
| 2089 | { |
| 2090 | struct ocfs2_dlm_seq_priv *priv = m->private; |
| 2091 | struct ocfs2_lock_res *iter = v; |
| 2092 | struct ocfs2_lock_res *dummy = &priv->p_iter_res; |
| 2093 | |
| 2094 | spin_lock(&ocfs2_dlm_tracking_lock); |
| 2095 | iter = ocfs2_dlm_next_res(iter, priv); |
| 2096 | list_del_init(&dummy->l_debug_list); |
| 2097 | if (iter) { |
| 2098 | list_add(&dummy->l_debug_list, &iter->l_debug_list); |
| 2099 | priv->p_tmp_res = *iter; |
| 2100 | iter = &priv->p_tmp_res; |
| 2101 | } |
| 2102 | spin_unlock(&ocfs2_dlm_tracking_lock); |
| 2103 | |
| 2104 | return iter; |
| 2105 | } |
| 2106 | |
| 2107 | /* So that debugfs.ocfs2 can determine which format is being used */ |
| 2108 | #define OCFS2_DLM_DEBUG_STR_VERSION 1 |
| 2109 | static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) |
| 2110 | { |
| 2111 | int i; |
| 2112 | char *lvb; |
| 2113 | struct ocfs2_lock_res *lockres = v; |
| 2114 | |
| 2115 | if (!lockres) |
| 2116 | return -EINVAL; |
| 2117 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2118 | seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); |
| 2119 | |
| 2120 | if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) |
| 2121 | seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, |
| 2122 | lockres->l_name, |
| 2123 | (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); |
| 2124 | else |
| 2125 | seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); |
| 2126 | |
| 2127 | seq_printf(m, "%d\t" |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2128 | "0x%lx\t" |
| 2129 | "0x%x\t" |
| 2130 | "0x%x\t" |
| 2131 | "%u\t" |
| 2132 | "%u\t" |
| 2133 | "%d\t" |
| 2134 | "%d\t", |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2135 | lockres->l_level, |
| 2136 | lockres->l_flags, |
| 2137 | lockres->l_action, |
| 2138 | lockres->l_unlock_action, |
| 2139 | lockres->l_ro_holders, |
| 2140 | lockres->l_ex_holders, |
| 2141 | lockres->l_requested, |
| 2142 | lockres->l_blocking); |
| 2143 | |
| 2144 | /* Dump the raw LVB */ |
| 2145 | lvb = lockres->l_lksb.lvb; |
| 2146 | for(i = 0; i < DLM_LVB_LEN; i++) |
| 2147 | seq_printf(m, "0x%x\t", lvb[i]); |
| 2148 | |
| 2149 | /* End the line */ |
| 2150 | seq_printf(m, "\n"); |
| 2151 | return 0; |
| 2152 | } |
| 2153 | |
| 2154 | static struct seq_operations ocfs2_dlm_seq_ops = { |
| 2155 | .start = ocfs2_dlm_seq_start, |
| 2156 | .stop = ocfs2_dlm_seq_stop, |
| 2157 | .next = ocfs2_dlm_seq_next, |
| 2158 | .show = ocfs2_dlm_seq_show, |
| 2159 | }; |
| 2160 | |
| 2161 | static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) |
| 2162 | { |
| 2163 | struct seq_file *seq = (struct seq_file *) file->private_data; |
| 2164 | struct ocfs2_dlm_seq_priv *priv = seq->private; |
| 2165 | struct ocfs2_lock_res *res = &priv->p_iter_res; |
| 2166 | |
| 2167 | ocfs2_remove_lockres_tracking(res); |
| 2168 | ocfs2_put_dlm_debug(priv->p_dlm_debug); |
| 2169 | return seq_release_private(inode, file); |
| 2170 | } |
| 2171 | |
| 2172 | static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) |
| 2173 | { |
| 2174 | int ret; |
| 2175 | struct ocfs2_dlm_seq_priv *priv; |
| 2176 | struct seq_file *seq; |
| 2177 | struct ocfs2_super *osb; |
| 2178 | |
| 2179 | priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); |
| 2180 | if (!priv) { |
| 2181 | ret = -ENOMEM; |
| 2182 | mlog_errno(ret); |
| 2183 | goto out; |
| 2184 | } |
| 2185 | osb = (struct ocfs2_super *) inode->u.generic_ip; |
| 2186 | ocfs2_get_dlm_debug(osb->osb_dlm_debug); |
| 2187 | priv->p_dlm_debug = osb->osb_dlm_debug; |
| 2188 | INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); |
| 2189 | |
| 2190 | ret = seq_open(file, &ocfs2_dlm_seq_ops); |
| 2191 | if (ret) { |
| 2192 | kfree(priv); |
| 2193 | mlog_errno(ret); |
| 2194 | goto out; |
| 2195 | } |
| 2196 | |
| 2197 | seq = (struct seq_file *) file->private_data; |
| 2198 | seq->private = priv; |
| 2199 | |
| 2200 | ocfs2_add_lockres_tracking(&priv->p_iter_res, |
| 2201 | priv->p_dlm_debug); |
| 2202 | |
| 2203 | out: |
| 2204 | return ret; |
| 2205 | } |
| 2206 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 2207 | static const struct file_operations ocfs2_dlm_debug_fops = { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2208 | .open = ocfs2_dlm_debug_open, |
| 2209 | .release = ocfs2_dlm_debug_release, |
| 2210 | .read = seq_read, |
| 2211 | .llseek = seq_lseek, |
| 2212 | }; |
| 2213 | |
| 2214 | static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) |
| 2215 | { |
| 2216 | int ret = 0; |
| 2217 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
| 2218 | |
| 2219 | dlm_debug->d_locking_state = debugfs_create_file("locking_state", |
| 2220 | S_IFREG|S_IRUSR, |
| 2221 | osb->osb_debug_root, |
| 2222 | osb, |
| 2223 | &ocfs2_dlm_debug_fops); |
| 2224 | if (!dlm_debug->d_locking_state) { |
| 2225 | ret = -EINVAL; |
| 2226 | mlog(ML_ERROR, |
| 2227 | "Unable to create locking state debugfs file.\n"); |
| 2228 | goto out; |
| 2229 | } |
| 2230 | |
| 2231 | ocfs2_get_dlm_debug(dlm_debug); |
| 2232 | out: |
| 2233 | return ret; |
| 2234 | } |
| 2235 | |
| 2236 | static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) |
| 2237 | { |
| 2238 | struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; |
| 2239 | |
| 2240 | if (dlm_debug) { |
| 2241 | debugfs_remove(dlm_debug->d_locking_state); |
| 2242 | ocfs2_put_dlm_debug(dlm_debug); |
| 2243 | } |
| 2244 | } |
| 2245 | |
| 2246 | int ocfs2_dlm_init(struct ocfs2_super *osb) |
| 2247 | { |
| 2248 | int status; |
| 2249 | u32 dlm_key; |
| 2250 | struct dlm_ctxt *dlm; |
| 2251 | |
| 2252 | mlog_entry_void(); |
| 2253 | |
| 2254 | status = ocfs2_dlm_init_debug(osb); |
| 2255 | if (status < 0) { |
| 2256 | mlog_errno(status); |
| 2257 | goto bail; |
| 2258 | } |
| 2259 | |
| 2260 | /* launch vote thread */ |
Mark Fasheh | 7842704 | 2006-05-04 12:03:26 -0700 | [diff] [blame] | 2261 | osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2262 | if (IS_ERR(osb->vote_task)) { |
| 2263 | status = PTR_ERR(osb->vote_task); |
| 2264 | osb->vote_task = NULL; |
| 2265 | mlog_errno(status); |
| 2266 | goto bail; |
| 2267 | } |
| 2268 | |
| 2269 | /* used by the dlm code to make message headers unique, each |
| 2270 | * node in this domain must agree on this. */ |
| 2271 | dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); |
| 2272 | |
| 2273 | /* for now, uuid == domain */ |
| 2274 | dlm = dlm_register_domain(osb->uuid_str, dlm_key); |
| 2275 | if (IS_ERR(dlm)) { |
| 2276 | status = PTR_ERR(dlm); |
| 2277 | mlog_errno(status); |
| 2278 | goto bail; |
| 2279 | } |
| 2280 | |
| 2281 | ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); |
| 2282 | ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); |
| 2283 | |
| 2284 | dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); |
| 2285 | |
| 2286 | osb->dlm = dlm; |
| 2287 | |
| 2288 | status = 0; |
| 2289 | bail: |
| 2290 | if (status < 0) { |
| 2291 | ocfs2_dlm_shutdown_debug(osb); |
| 2292 | if (osb->vote_task) |
| 2293 | kthread_stop(osb->vote_task); |
| 2294 | } |
| 2295 | |
| 2296 | mlog_exit(status); |
| 2297 | return status; |
| 2298 | } |
| 2299 | |
| 2300 | void ocfs2_dlm_shutdown(struct ocfs2_super *osb) |
| 2301 | { |
| 2302 | mlog_entry_void(); |
| 2303 | |
| 2304 | dlm_unregister_eviction_cb(&osb->osb_eviction_cb); |
| 2305 | |
| 2306 | ocfs2_drop_osb_locks(osb); |
| 2307 | |
| 2308 | if (osb->vote_task) { |
| 2309 | kthread_stop(osb->vote_task); |
| 2310 | osb->vote_task = NULL; |
| 2311 | } |
| 2312 | |
| 2313 | ocfs2_lock_res_free(&osb->osb_super_lockres); |
| 2314 | ocfs2_lock_res_free(&osb->osb_rename_lockres); |
| 2315 | |
| 2316 | dlm_unregister_domain(osb->dlm); |
| 2317 | osb->dlm = NULL; |
| 2318 | |
| 2319 | ocfs2_dlm_shutdown_debug(osb); |
| 2320 | |
| 2321 | mlog_exit_void(); |
| 2322 | } |
| 2323 | |
| 2324 | static void ocfs2_unlock_ast_func(void *opaque, enum dlm_status status) |
| 2325 | { |
| 2326 | struct ocfs2_lock_res *lockres = opaque; |
| 2327 | unsigned long flags; |
| 2328 | |
| 2329 | mlog_entry_void(); |
| 2330 | |
| 2331 | mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, |
| 2332 | lockres->l_unlock_action); |
| 2333 | |
| 2334 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2335 | /* We tried to cancel a convert request, but it was already |
| 2336 | * granted. All we want to do here is clear our unlock |
| 2337 | * state. The wake_up call done at the bottom is redundant |
| 2338 | * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't |
| 2339 | * hurt anything anyway */ |
| 2340 | if (status == DLM_CANCELGRANT && |
| 2341 | lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
| 2342 | mlog(0, "Got cancelgrant for %s\n", lockres->l_name); |
| 2343 | |
| 2344 | /* We don't clear the busy flag in this case as it |
| 2345 | * should have been cleared by the ast which the dlm |
| 2346 | * has called. */ |
| 2347 | goto complete_unlock; |
| 2348 | } |
| 2349 | |
| 2350 | if (status != DLM_NORMAL) { |
| 2351 | mlog(ML_ERROR, "Dlm passes status %d for lock %s, " |
| 2352 | "unlock_action %d\n", status, lockres->l_name, |
| 2353 | lockres->l_unlock_action); |
| 2354 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2355 | return; |
| 2356 | } |
| 2357 | |
| 2358 | switch(lockres->l_unlock_action) { |
| 2359 | case OCFS2_UNLOCK_CANCEL_CONVERT: |
| 2360 | mlog(0, "Cancel convert success for %s\n", lockres->l_name); |
| 2361 | lockres->l_action = OCFS2_AST_INVALID; |
| 2362 | break; |
| 2363 | case OCFS2_UNLOCK_DROP_LOCK: |
| 2364 | lockres->l_level = LKM_IVMODE; |
| 2365 | break; |
| 2366 | default: |
| 2367 | BUG(); |
| 2368 | } |
| 2369 | |
| 2370 | lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); |
| 2371 | complete_unlock: |
| 2372 | lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; |
| 2373 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2374 | |
| 2375 | wake_up(&lockres->l_event); |
| 2376 | |
| 2377 | mlog_exit_void(); |
| 2378 | } |
| 2379 | |
| 2380 | typedef void (ocfs2_pre_drop_cb_t)(struct ocfs2_lock_res *, void *); |
| 2381 | |
| 2382 | struct drop_lock_cb { |
| 2383 | ocfs2_pre_drop_cb_t *drop_func; |
| 2384 | void *drop_data; |
| 2385 | }; |
| 2386 | |
| 2387 | static int ocfs2_drop_lock(struct ocfs2_super *osb, |
| 2388 | struct ocfs2_lock_res *lockres, |
| 2389 | struct drop_lock_cb *dcb) |
| 2390 | { |
| 2391 | enum dlm_status status; |
| 2392 | unsigned long flags; |
| 2393 | |
| 2394 | /* We didn't get anywhere near actually using this lockres. */ |
| 2395 | if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) |
| 2396 | goto out; |
| 2397 | |
| 2398 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2399 | |
| 2400 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), |
| 2401 | "lockres %s, flags 0x%lx\n", |
| 2402 | lockres->l_name, lockres->l_flags); |
| 2403 | |
| 2404 | while (lockres->l_flags & OCFS2_LOCK_BUSY) { |
| 2405 | mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " |
| 2406 | "%u, unlock_action = %u\n", |
| 2407 | lockres->l_name, lockres->l_flags, lockres->l_action, |
| 2408 | lockres->l_unlock_action); |
| 2409 | |
| 2410 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2411 | |
| 2412 | /* XXX: Today we just wait on any busy |
| 2413 | * locks... Perhaps we need to cancel converts in the |
| 2414 | * future? */ |
| 2415 | ocfs2_wait_on_busy_lock(lockres); |
| 2416 | |
| 2417 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2418 | } |
| 2419 | |
| 2420 | if (dcb) |
| 2421 | dcb->drop_func(lockres, dcb->drop_data); |
| 2422 | |
| 2423 | if (lockres->l_flags & OCFS2_LOCK_BUSY) |
| 2424 | mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", |
| 2425 | lockres->l_name); |
| 2426 | if (lockres->l_flags & OCFS2_LOCK_BLOCKED) |
| 2427 | mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); |
| 2428 | |
| 2429 | if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { |
| 2430 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2431 | goto out; |
| 2432 | } |
| 2433 | |
| 2434 | lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); |
| 2435 | |
| 2436 | /* make sure we never get here while waiting for an ast to |
| 2437 | * fire. */ |
| 2438 | BUG_ON(lockres->l_action != OCFS2_AST_INVALID); |
| 2439 | |
| 2440 | /* is this necessary? */ |
| 2441 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 2442 | lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; |
| 2443 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2444 | |
| 2445 | mlog(0, "lock %s\n", lockres->l_name); |
| 2446 | |
| 2447 | status = dlmunlock(osb->dlm, &lockres->l_lksb, LKM_VALBLK, |
| 2448 | lockres->l_ops->unlock_ast, lockres); |
| 2449 | if (status != DLM_NORMAL) { |
| 2450 | ocfs2_log_dlm_error("dlmunlock", status, lockres); |
| 2451 | mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); |
| 2452 | dlm_print_one_lock(lockres->l_lksb.lockid); |
| 2453 | BUG(); |
| 2454 | } |
| 2455 | mlog(0, "lock %s, successfull return from dlmunlock\n", |
| 2456 | lockres->l_name); |
| 2457 | |
| 2458 | ocfs2_wait_on_busy_lock(lockres); |
| 2459 | out: |
| 2460 | mlog_exit(0); |
| 2461 | return 0; |
| 2462 | } |
| 2463 | |
| 2464 | /* Mark the lockres as being dropped. It will no longer be |
| 2465 | * queued if blocking, but we still may have to wait on it |
| 2466 | * being dequeued from the vote thread before we can consider |
| 2467 | * it safe to drop. |
| 2468 | * |
| 2469 | * You can *not* attempt to call cluster_lock on this lockres anymore. */ |
| 2470 | void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) |
| 2471 | { |
| 2472 | int status; |
| 2473 | struct ocfs2_mask_waiter mw; |
| 2474 | unsigned long flags; |
| 2475 | |
| 2476 | ocfs2_init_mask_waiter(&mw); |
| 2477 | |
| 2478 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2479 | lockres->l_flags |= OCFS2_LOCK_FREEING; |
| 2480 | while (lockres->l_flags & OCFS2_LOCK_QUEUED) { |
| 2481 | lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); |
| 2482 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2483 | |
| 2484 | mlog(0, "Waiting on lockres %s\n", lockres->l_name); |
| 2485 | |
| 2486 | status = ocfs2_wait_for_mask(&mw); |
| 2487 | if (status) |
| 2488 | mlog_errno(status); |
| 2489 | |
| 2490 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2491 | } |
| 2492 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2493 | } |
| 2494 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2495 | void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, |
| 2496 | struct ocfs2_lock_res *lockres) |
| 2497 | { |
| 2498 | int ret; |
| 2499 | |
| 2500 | ocfs2_mark_lockres_freeing(lockres); |
| 2501 | ret = ocfs2_drop_lock(osb, lockres, NULL); |
| 2502 | if (ret) |
| 2503 | mlog_errno(ret); |
| 2504 | } |
| 2505 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2506 | static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) |
| 2507 | { |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2508 | ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); |
| 2509 | ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2510 | } |
| 2511 | |
| 2512 | static void ocfs2_meta_pre_drop(struct ocfs2_lock_res *lockres, void *data) |
| 2513 | { |
| 2514 | struct inode *inode = data; |
| 2515 | |
| 2516 | /* the metadata lock requires a bit more work as we have an |
| 2517 | * LVB to worry about. */ |
| 2518 | if (lockres->l_flags & OCFS2_LOCK_ATTACHED && |
| 2519 | lockres->l_level == LKM_EXMODE && |
| 2520 | !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) |
| 2521 | __ocfs2_stuff_meta_lvb(inode); |
| 2522 | } |
| 2523 | |
| 2524 | int ocfs2_drop_inode_locks(struct inode *inode) |
| 2525 | { |
| 2526 | int status, err; |
| 2527 | struct drop_lock_cb meta_dcb = { ocfs2_meta_pre_drop, inode, }; |
| 2528 | |
| 2529 | mlog_entry_void(); |
| 2530 | |
| 2531 | /* No need to call ocfs2_mark_lockres_freeing here - |
| 2532 | * ocfs2_clear_inode has done it for us. */ |
| 2533 | |
| 2534 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2535 | &OCFS2_I(inode)->ip_data_lockres, |
| 2536 | NULL); |
| 2537 | if (err < 0) |
| 2538 | mlog_errno(err); |
| 2539 | |
| 2540 | status = err; |
| 2541 | |
| 2542 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2543 | &OCFS2_I(inode)->ip_meta_lockres, |
| 2544 | &meta_dcb); |
| 2545 | if (err < 0) |
| 2546 | mlog_errno(err); |
| 2547 | if (err < 0 && !status) |
| 2548 | status = err; |
| 2549 | |
| 2550 | err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), |
| 2551 | &OCFS2_I(inode)->ip_rw_lockres, |
| 2552 | NULL); |
| 2553 | if (err < 0) |
| 2554 | mlog_errno(err); |
| 2555 | if (err < 0 && !status) |
| 2556 | status = err; |
| 2557 | |
| 2558 | mlog_exit(status); |
| 2559 | return status; |
| 2560 | } |
| 2561 | |
| 2562 | static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, |
| 2563 | int new_level) |
| 2564 | { |
| 2565 | assert_spin_locked(&lockres->l_lock); |
| 2566 | |
| 2567 | BUG_ON(lockres->l_blocking <= LKM_NLMODE); |
| 2568 | |
| 2569 | if (lockres->l_level <= new_level) { |
| 2570 | mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", |
| 2571 | lockres->l_level, new_level); |
| 2572 | BUG(); |
| 2573 | } |
| 2574 | |
| 2575 | mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", |
| 2576 | lockres->l_name, new_level, lockres->l_blocking); |
| 2577 | |
| 2578 | lockres->l_action = OCFS2_AST_DOWNCONVERT; |
| 2579 | lockres->l_requested = new_level; |
| 2580 | lockres_or_flags(lockres, OCFS2_LOCK_BUSY); |
| 2581 | } |
| 2582 | |
| 2583 | static int ocfs2_downconvert_lock(struct ocfs2_super *osb, |
| 2584 | struct ocfs2_lock_res *lockres, |
| 2585 | int new_level, |
| 2586 | int lvb) |
| 2587 | { |
| 2588 | int ret, dlm_flags = LKM_CONVERT; |
| 2589 | enum dlm_status status; |
| 2590 | |
| 2591 | mlog_entry_void(); |
| 2592 | |
| 2593 | if (lvb) |
| 2594 | dlm_flags |= LKM_VALBLK; |
| 2595 | |
| 2596 | status = dlmlock(osb->dlm, |
| 2597 | new_level, |
| 2598 | &lockres->l_lksb, |
| 2599 | dlm_flags, |
| 2600 | lockres->l_name, |
Mark Fasheh | f068106 | 2006-09-08 11:40:10 -0700 | [diff] [blame] | 2601 | OCFS2_LOCK_ID_MAX_LEN - 1, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2602 | lockres->l_ops->ast, |
| 2603 | lockres, |
| 2604 | lockres->l_ops->bast); |
| 2605 | if (status != DLM_NORMAL) { |
| 2606 | ocfs2_log_dlm_error("dlmlock", status, lockres); |
| 2607 | ret = -EINVAL; |
| 2608 | ocfs2_recover_from_dlm_error(lockres, 1); |
| 2609 | goto bail; |
| 2610 | } |
| 2611 | |
| 2612 | ret = 0; |
| 2613 | bail: |
| 2614 | mlog_exit(ret); |
| 2615 | return ret; |
| 2616 | } |
| 2617 | |
| 2618 | /* returns 1 when the caller should unlock and call dlmunlock */ |
| 2619 | static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, |
| 2620 | struct ocfs2_lock_res *lockres) |
| 2621 | { |
| 2622 | assert_spin_locked(&lockres->l_lock); |
| 2623 | |
| 2624 | mlog_entry_void(); |
| 2625 | mlog(0, "lock %s\n", lockres->l_name); |
| 2626 | |
| 2627 | if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { |
| 2628 | /* If we're already trying to cancel a lock conversion |
| 2629 | * then just drop the spinlock and allow the caller to |
| 2630 | * requeue this lock. */ |
| 2631 | |
| 2632 | mlog(0, "Lockres %s, skip convert\n", lockres->l_name); |
| 2633 | return 0; |
| 2634 | } |
| 2635 | |
| 2636 | /* were we in a convert when we got the bast fire? */ |
| 2637 | BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && |
| 2638 | lockres->l_action != OCFS2_AST_DOWNCONVERT); |
| 2639 | /* set things up for the unlockast to know to just |
| 2640 | * clear out the ast_action and unset busy, etc. */ |
| 2641 | lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; |
| 2642 | |
| 2643 | mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), |
| 2644 | "lock %s, invalid flags: 0x%lx\n", |
| 2645 | lockres->l_name, lockres->l_flags); |
| 2646 | |
| 2647 | return 1; |
| 2648 | } |
| 2649 | |
| 2650 | static int ocfs2_cancel_convert(struct ocfs2_super *osb, |
| 2651 | struct ocfs2_lock_res *lockres) |
| 2652 | { |
| 2653 | int ret; |
| 2654 | enum dlm_status status; |
| 2655 | |
| 2656 | mlog_entry_void(); |
| 2657 | mlog(0, "lock %s\n", lockres->l_name); |
| 2658 | |
| 2659 | ret = 0; |
| 2660 | status = dlmunlock(osb->dlm, |
| 2661 | &lockres->l_lksb, |
| 2662 | LKM_CANCEL, |
| 2663 | lockres->l_ops->unlock_ast, |
| 2664 | lockres); |
| 2665 | if (status != DLM_NORMAL) { |
| 2666 | ocfs2_log_dlm_error("dlmunlock", status, lockres); |
| 2667 | ret = -EINVAL; |
| 2668 | ocfs2_recover_from_dlm_error(lockres, 0); |
| 2669 | } |
| 2670 | |
| 2671 | mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); |
| 2672 | |
| 2673 | mlog_exit(ret); |
| 2674 | return ret; |
| 2675 | } |
| 2676 | |
| 2677 | static inline int ocfs2_can_downconvert_meta_lock(struct inode *inode, |
| 2678 | struct ocfs2_lock_res *lockres, |
| 2679 | int new_level) |
| 2680 | { |
| 2681 | int ret; |
| 2682 | |
| 2683 | mlog_entry_void(); |
| 2684 | |
| 2685 | BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); |
| 2686 | |
| 2687 | if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { |
| 2688 | ret = 0; |
| 2689 | mlog(0, "lockres %s currently being refreshed -- backing " |
| 2690 | "off!\n", lockres->l_name); |
| 2691 | } else if (new_level == LKM_PRMODE) |
| 2692 | ret = !lockres->l_ex_holders && |
| 2693 | ocfs2_inode_fully_checkpointed(inode); |
| 2694 | else /* Must be NLMODE we're converting to. */ |
| 2695 | ret = !lockres->l_ro_holders && !lockres->l_ex_holders && |
| 2696 | ocfs2_inode_fully_checkpointed(inode); |
| 2697 | |
| 2698 | mlog_exit(ret); |
| 2699 | return ret; |
| 2700 | } |
| 2701 | |
| 2702 | static int ocfs2_do_unblock_meta(struct inode *inode, |
| 2703 | int *requeue) |
| 2704 | { |
| 2705 | int new_level; |
| 2706 | int set_lvb = 0; |
| 2707 | int ret = 0; |
| 2708 | struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; |
| 2709 | unsigned long flags; |
| 2710 | |
| 2711 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
| 2712 | |
| 2713 | mlog_entry_void(); |
| 2714 | |
| 2715 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2716 | |
| 2717 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 2718 | |
| 2719 | mlog(0, "l_level=%d, l_blocking=%d\n", lockres->l_level, |
| 2720 | lockres->l_blocking); |
| 2721 | |
| 2722 | BUG_ON(lockres->l_level != LKM_EXMODE && |
| 2723 | lockres->l_level != LKM_PRMODE); |
| 2724 | |
| 2725 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
| 2726 | *requeue = 1; |
| 2727 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
| 2728 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2729 | if (ret) { |
| 2730 | ret = ocfs2_cancel_convert(osb, lockres); |
| 2731 | if (ret < 0) |
| 2732 | mlog_errno(ret); |
| 2733 | } |
| 2734 | goto leave; |
| 2735 | } |
| 2736 | |
| 2737 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 2738 | |
| 2739 | mlog(0, "l_level=%d, l_blocking=%d, new_level=%d\n", |
| 2740 | lockres->l_level, lockres->l_blocking, new_level); |
| 2741 | |
| 2742 | if (ocfs2_can_downconvert_meta_lock(inode, lockres, new_level)) { |
| 2743 | if (lockres->l_level == LKM_EXMODE) |
| 2744 | set_lvb = 1; |
| 2745 | |
| 2746 | /* If the lock hasn't been refreshed yet (rare), then |
| 2747 | * our memory inode values are old and we skip |
| 2748 | * stuffing the lvb. There's no need to actually clear |
| 2749 | * out the lvb here as it's value is still valid. */ |
| 2750 | if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { |
| 2751 | if (set_lvb) |
| 2752 | __ocfs2_stuff_meta_lvb(inode); |
| 2753 | } else |
| 2754 | mlog(0, "lockres %s: downconverting stale lock!\n", |
| 2755 | lockres->l_name); |
| 2756 | |
| 2757 | mlog(0, "calling ocfs2_downconvert_lock with l_level=%d, " |
| 2758 | "l_blocking=%d, new_level=%d\n", |
| 2759 | lockres->l_level, lockres->l_blocking, new_level); |
| 2760 | |
| 2761 | ocfs2_prepare_downconvert(lockres, new_level); |
| 2762 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2763 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); |
| 2764 | goto leave; |
| 2765 | } |
| 2766 | if (!ocfs2_inode_fully_checkpointed(inode)) |
| 2767 | ocfs2_start_checkpoint(osb); |
| 2768 | |
| 2769 | *requeue = 1; |
| 2770 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2771 | ret = 0; |
| 2772 | leave: |
| 2773 | mlog_exit(ret); |
| 2774 | return ret; |
| 2775 | } |
| 2776 | |
| 2777 | static int ocfs2_generic_unblock_lock(struct ocfs2_super *osb, |
| 2778 | struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2779 | struct ocfs2_unblock_ctl *ctl, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2780 | ocfs2_convert_worker_t *worker) |
| 2781 | { |
| 2782 | unsigned long flags; |
| 2783 | int blocking; |
| 2784 | int new_level; |
| 2785 | int ret = 0; |
| 2786 | |
| 2787 | mlog_entry_void(); |
| 2788 | |
| 2789 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2790 | |
| 2791 | BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); |
| 2792 | |
| 2793 | recheck: |
| 2794 | if (lockres->l_flags & OCFS2_LOCK_BUSY) { |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2795 | ctl->requeue = 1; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2796 | ret = ocfs2_prepare_cancel_convert(osb, lockres); |
| 2797 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2798 | if (ret) { |
| 2799 | ret = ocfs2_cancel_convert(osb, lockres); |
| 2800 | if (ret < 0) |
| 2801 | mlog_errno(ret); |
| 2802 | } |
| 2803 | goto leave; |
| 2804 | } |
| 2805 | |
| 2806 | /* if we're blocking an exclusive and we have *any* holders, |
| 2807 | * then requeue. */ |
| 2808 | if ((lockres->l_blocking == LKM_EXMODE) |
| 2809 | && (lockres->l_ex_holders || lockres->l_ro_holders)) { |
| 2810 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2811 | ctl->requeue = 1; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2812 | ret = 0; |
| 2813 | goto leave; |
| 2814 | } |
| 2815 | |
| 2816 | /* If it's a PR we're blocking, then only |
| 2817 | * requeue if we've got any EX holders */ |
| 2818 | if (lockres->l_blocking == LKM_PRMODE && |
| 2819 | lockres->l_ex_holders) { |
| 2820 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2821 | ctl->requeue = 1; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2822 | ret = 0; |
| 2823 | goto leave; |
| 2824 | } |
| 2825 | |
| 2826 | /* If we get here, then we know that there are no more |
| 2827 | * incompatible holders (and anyone asking for an incompatible |
| 2828 | * lock is blocked). We can now downconvert the lock */ |
| 2829 | if (!worker) |
| 2830 | goto downconvert; |
| 2831 | |
| 2832 | /* Some lockres types want to do a bit of work before |
| 2833 | * downconverting a lock. Allow that here. The worker function |
| 2834 | * may sleep, so we save off a copy of what we're blocking as |
| 2835 | * it may change while we're not holding the spin lock. */ |
| 2836 | blocking = lockres->l_blocking; |
| 2837 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2838 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2839 | ctl->unblock_action = worker(lockres, blocking); |
| 2840 | |
| 2841 | if (ctl->unblock_action == UNBLOCK_STOP_POST) |
| 2842 | goto leave; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2843 | |
| 2844 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 2845 | if (blocking != lockres->l_blocking) { |
| 2846 | /* If this changed underneath us, then we can't drop |
| 2847 | * it just yet. */ |
| 2848 | goto recheck; |
| 2849 | } |
| 2850 | |
| 2851 | downconvert: |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2852 | ctl->requeue = 0; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2853 | new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); |
| 2854 | |
| 2855 | ocfs2_prepare_downconvert(lockres, new_level); |
| 2856 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 2857 | ret = ocfs2_downconvert_lock(osb, lockres, new_level, 0); |
| 2858 | leave: |
| 2859 | mlog_exit(ret); |
| 2860 | return ret; |
| 2861 | } |
| 2862 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2863 | static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, |
| 2864 | int blocking) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2865 | { |
| 2866 | struct inode *inode; |
| 2867 | struct address_space *mapping; |
| 2868 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2869 | inode = ocfs2_lock_res_inode(lockres); |
| 2870 | mapping = inode->i_mapping; |
| 2871 | |
| 2872 | if (filemap_fdatawrite(mapping)) { |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2873 | mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", |
| 2874 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2875 | } |
| 2876 | sync_mapping_buffers(mapping); |
| 2877 | if (blocking == LKM_EXMODE) { |
| 2878 | truncate_inode_pages(mapping, 0); |
| 2879 | unmap_mapping_range(mapping, 0, 0, 0); |
| 2880 | } else { |
| 2881 | /* We only need to wait on the I/O if we're not also |
| 2882 | * truncating pages because truncate_inode_pages waits |
| 2883 | * for us above. We don't truncate pages if we're |
| 2884 | * blocking anything < EXMODE because we want to keep |
| 2885 | * them around in that case. */ |
| 2886 | filemap_fdatawait(mapping); |
| 2887 | } |
| 2888 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2889 | return UNBLOCK_CONTINUE; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2890 | } |
| 2891 | |
| 2892 | int ocfs2_unblock_data(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2893 | struct ocfs2_unblock_ctl *ctl) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2894 | { |
| 2895 | int status; |
| 2896 | struct inode *inode; |
| 2897 | struct ocfs2_super *osb; |
| 2898 | |
| 2899 | mlog_entry_void(); |
| 2900 | |
| 2901 | inode = ocfs2_lock_res_inode(lockres); |
| 2902 | osb = OCFS2_SB(inode->i_sb); |
| 2903 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2904 | mlog(0, "unblock inode %llu\n", |
| 2905 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2906 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2907 | status = ocfs2_generic_unblock_lock(osb, lockres, ctl, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2908 | ocfs2_data_convert_worker); |
| 2909 | if (status < 0) |
| 2910 | mlog_errno(status); |
| 2911 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2912 | mlog(0, "inode %llu, requeue = %d\n", |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2913 | (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2914 | |
| 2915 | mlog_exit(status); |
| 2916 | return status; |
| 2917 | } |
| 2918 | |
| 2919 | static int ocfs2_unblock_inode_lock(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2920 | struct ocfs2_unblock_ctl *ctl) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2921 | { |
| 2922 | int status; |
| 2923 | struct inode *inode; |
| 2924 | |
| 2925 | mlog_entry_void(); |
| 2926 | |
| 2927 | mlog(0, "Unblock lockres %s\n", lockres->l_name); |
| 2928 | |
| 2929 | inode = ocfs2_lock_res_inode(lockres); |
| 2930 | |
| 2931 | status = ocfs2_generic_unblock_lock(OCFS2_SB(inode->i_sb), |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2932 | lockres, ctl, NULL); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2933 | if (status < 0) |
| 2934 | mlog_errno(status); |
| 2935 | |
| 2936 | mlog_exit(status); |
| 2937 | return status; |
| 2938 | } |
| 2939 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2940 | static int ocfs2_unblock_meta(struct ocfs2_lock_res *lockres, |
| 2941 | struct ocfs2_unblock_ctl *ctl) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2942 | { |
| 2943 | int status; |
| 2944 | struct inode *inode; |
| 2945 | |
| 2946 | mlog_entry_void(); |
| 2947 | |
| 2948 | inode = ocfs2_lock_res_inode(lockres); |
| 2949 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2950 | mlog(0, "unblock inode %llu\n", |
| 2951 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2952 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2953 | status = ocfs2_do_unblock_meta(inode, &ctl->requeue); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2954 | if (status < 0) |
| 2955 | mlog_errno(status); |
| 2956 | |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 2957 | mlog(0, "inode %llu, requeue = %d\n", |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2958 | (unsigned long long)OCFS2_I(inode)->ip_blkno, ctl->requeue); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 2959 | |
| 2960 | mlog_exit(status); |
| 2961 | return status; |
| 2962 | } |
| 2963 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 2964 | /* |
| 2965 | * Does the final reference drop on our dentry lock. Right now this |
| 2966 | * happens in the vote thread, but we could choose to simplify the |
| 2967 | * dlmglue API and push these off to the ocfs2_wq in the future. |
| 2968 | */ |
| 2969 | static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, |
| 2970 | struct ocfs2_lock_res *lockres) |
| 2971 | { |
| 2972 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); |
| 2973 | ocfs2_dentry_lock_put(osb, dl); |
| 2974 | } |
| 2975 | |
| 2976 | /* |
| 2977 | * d_delete() matching dentries before the lock downconvert. |
| 2978 | * |
| 2979 | * At this point, any process waiting to destroy the |
| 2980 | * dentry_lock due to last ref count is stopped by the |
| 2981 | * OCFS2_LOCK_QUEUED flag. |
| 2982 | * |
| 2983 | * We have two potential problems |
| 2984 | * |
| 2985 | * 1) If we do the last reference drop on our dentry_lock (via dput) |
| 2986 | * we'll wind up in ocfs2_release_dentry_lock(), waiting on |
| 2987 | * the downconvert to finish. Instead we take an elevated |
| 2988 | * reference and push the drop until after we've completed our |
| 2989 | * unblock processing. |
| 2990 | * |
| 2991 | * 2) There might be another process with a final reference, |
| 2992 | * waiting on us to finish processing. If this is the case, we |
| 2993 | * detect it and exit out - there's no more dentries anyway. |
| 2994 | */ |
| 2995 | static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, |
| 2996 | int blocking) |
| 2997 | { |
| 2998 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); |
| 2999 | struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); |
| 3000 | struct dentry *dentry; |
| 3001 | unsigned long flags; |
| 3002 | int extra_ref = 0; |
| 3003 | |
| 3004 | /* |
| 3005 | * This node is blocking another node from getting a read |
| 3006 | * lock. This happens when we've renamed within a |
| 3007 | * directory. We've forced the other nodes to d_delete(), but |
| 3008 | * we never actually dropped our lock because it's still |
| 3009 | * valid. The downconvert code will retain a PR for this node, |
| 3010 | * so there's no further work to do. |
| 3011 | */ |
| 3012 | if (blocking == LKM_PRMODE) |
| 3013 | return UNBLOCK_CONTINUE; |
| 3014 | |
| 3015 | /* |
| 3016 | * Mark this inode as potentially orphaned. The code in |
| 3017 | * ocfs2_delete_inode() will figure out whether it actually |
| 3018 | * needs to be freed or not. |
| 3019 | */ |
| 3020 | spin_lock(&oi->ip_lock); |
| 3021 | oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; |
| 3022 | spin_unlock(&oi->ip_lock); |
| 3023 | |
| 3024 | /* |
| 3025 | * Yuck. We need to make sure however that the check of |
| 3026 | * OCFS2_LOCK_FREEING and the extra reference are atomic with |
| 3027 | * respect to a reference decrement or the setting of that |
| 3028 | * flag. |
| 3029 | */ |
| 3030 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 3031 | spin_lock(&dentry_attach_lock); |
| 3032 | if (!(lockres->l_flags & OCFS2_LOCK_FREEING) |
| 3033 | && dl->dl_count) { |
| 3034 | dl->dl_count++; |
| 3035 | extra_ref = 1; |
| 3036 | } |
| 3037 | spin_unlock(&dentry_attach_lock); |
| 3038 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 3039 | |
| 3040 | mlog(0, "extra_ref = %d\n", extra_ref); |
| 3041 | |
| 3042 | /* |
| 3043 | * We have a process waiting on us in ocfs2_dentry_iput(), |
| 3044 | * which means we can't have any more outstanding |
| 3045 | * aliases. There's no need to do any more work. |
| 3046 | */ |
| 3047 | if (!extra_ref) |
| 3048 | return UNBLOCK_CONTINUE; |
| 3049 | |
| 3050 | spin_lock(&dentry_attach_lock); |
| 3051 | while (1) { |
| 3052 | dentry = ocfs2_find_local_alias(dl->dl_inode, |
| 3053 | dl->dl_parent_blkno, 1); |
| 3054 | if (!dentry) |
| 3055 | break; |
| 3056 | spin_unlock(&dentry_attach_lock); |
| 3057 | |
| 3058 | mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, |
| 3059 | dentry->d_name.name); |
| 3060 | |
| 3061 | /* |
| 3062 | * The following dcache calls may do an |
| 3063 | * iput(). Normally we don't want that from the |
| 3064 | * downconverting thread, but in this case it's ok |
| 3065 | * because the requesting node already has an |
| 3066 | * exclusive lock on the inode, so it can't be queued |
| 3067 | * for a downconvert. |
| 3068 | */ |
| 3069 | d_delete(dentry); |
| 3070 | dput(dentry); |
| 3071 | |
| 3072 | spin_lock(&dentry_attach_lock); |
| 3073 | } |
| 3074 | spin_unlock(&dentry_attach_lock); |
| 3075 | |
| 3076 | /* |
| 3077 | * If we are the last holder of this dentry lock, there is no |
| 3078 | * reason to downconvert so skip straight to the unlock. |
| 3079 | */ |
| 3080 | if (dl->dl_count == 1) |
| 3081 | return UNBLOCK_STOP_POST; |
| 3082 | |
| 3083 | return UNBLOCK_CONTINUE_POST; |
| 3084 | } |
| 3085 | |
| 3086 | static int ocfs2_unblock_dentry_lock(struct ocfs2_lock_res *lockres, |
| 3087 | struct ocfs2_unblock_ctl *ctl) |
| 3088 | { |
| 3089 | int ret; |
| 3090 | struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); |
| 3091 | struct ocfs2_super *osb = OCFS2_SB(dl->dl_inode->i_sb); |
| 3092 | |
| 3093 | mlog(0, "unblock dentry lock: %llu\n", |
| 3094 | (unsigned long long)OCFS2_I(dl->dl_inode)->ip_blkno); |
| 3095 | |
| 3096 | ret = ocfs2_generic_unblock_lock(osb, |
| 3097 | lockres, |
| 3098 | ctl, |
| 3099 | ocfs2_dentry_convert_worker); |
| 3100 | if (ret < 0) |
| 3101 | mlog_errno(ret); |
| 3102 | |
| 3103 | mlog(0, "requeue = %d, post = %d\n", ctl->requeue, ctl->unblock_action); |
| 3104 | |
| 3105 | return ret; |
| 3106 | } |
| 3107 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3108 | /* Generic unblock function for any lockres whose private data is an |
| 3109 | * ocfs2_super pointer. */ |
| 3110 | static int ocfs2_unblock_osb_lock(struct ocfs2_lock_res *lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3111 | struct ocfs2_unblock_ctl *ctl) |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3112 | { |
| 3113 | int status; |
| 3114 | struct ocfs2_super *osb; |
| 3115 | |
| 3116 | mlog_entry_void(); |
| 3117 | |
| 3118 | mlog(0, "Unblock lockres %s\n", lockres->l_name); |
| 3119 | |
| 3120 | osb = ocfs2_lock_res_super(lockres); |
| 3121 | |
| 3122 | status = ocfs2_generic_unblock_lock(osb, |
| 3123 | lockres, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3124 | ctl, |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3125 | NULL); |
| 3126 | if (status < 0) |
| 3127 | mlog_errno(status); |
| 3128 | |
| 3129 | mlog_exit(status); |
| 3130 | return status; |
| 3131 | } |
| 3132 | |
| 3133 | void ocfs2_process_blocked_lock(struct ocfs2_super *osb, |
| 3134 | struct ocfs2_lock_res *lockres) |
| 3135 | { |
| 3136 | int status; |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3137 | struct ocfs2_unblock_ctl ctl = {0, 0,}; |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3138 | unsigned long flags; |
| 3139 | |
| 3140 | /* Our reference to the lockres in this function can be |
| 3141 | * considered valid until we remove the OCFS2_LOCK_QUEUED |
| 3142 | * flag. */ |
| 3143 | |
| 3144 | mlog_entry_void(); |
| 3145 | |
| 3146 | BUG_ON(!lockres); |
| 3147 | BUG_ON(!lockres->l_ops); |
| 3148 | BUG_ON(!lockres->l_ops->unblock); |
| 3149 | |
| 3150 | mlog(0, "lockres %s blocked.\n", lockres->l_name); |
| 3151 | |
| 3152 | /* Detect whether a lock has been marked as going away while |
| 3153 | * the vote thread was processing other things. A lock can |
| 3154 | * still be marked with OCFS2_LOCK_FREEING after this check, |
| 3155 | * but short circuiting here will still save us some |
| 3156 | * performance. */ |
| 3157 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 3158 | if (lockres->l_flags & OCFS2_LOCK_FREEING) |
| 3159 | goto unqueue; |
| 3160 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 3161 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3162 | status = lockres->l_ops->unblock(lockres, &ctl); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3163 | if (status < 0) |
| 3164 | mlog_errno(status); |
| 3165 | |
| 3166 | spin_lock_irqsave(&lockres->l_lock, flags); |
| 3167 | unqueue: |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3168 | if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3169 | lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); |
| 3170 | } else |
| 3171 | ocfs2_schedule_blocked_lock(osb, lockres); |
| 3172 | |
| 3173 | mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3174 | ctl.requeue ? "yes" : "no"); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3175 | spin_unlock_irqrestore(&lockres->l_lock, flags); |
| 3176 | |
Mark Fasheh | d680efe | 2006-09-08 14:14:34 -0700 | [diff] [blame] | 3177 | if (ctl.unblock_action != UNBLOCK_CONTINUE |
| 3178 | && lockres->l_ops->post_unlock) |
| 3179 | lockres->l_ops->post_unlock(osb, lockres); |
| 3180 | |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3181 | mlog_exit_void(); |
| 3182 | } |
| 3183 | |
| 3184 | static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, |
| 3185 | struct ocfs2_lock_res *lockres) |
| 3186 | { |
| 3187 | mlog_entry_void(); |
| 3188 | |
| 3189 | assert_spin_locked(&lockres->l_lock); |
| 3190 | |
| 3191 | if (lockres->l_flags & OCFS2_LOCK_FREEING) { |
| 3192 | /* Do not schedule a lock for downconvert when it's on |
| 3193 | * the way to destruction - any nodes wanting access |
| 3194 | * to the resource will get it soon. */ |
| 3195 | mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", |
| 3196 | lockres->l_name, lockres->l_flags); |
| 3197 | return; |
| 3198 | } |
| 3199 | |
| 3200 | lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); |
| 3201 | |
| 3202 | spin_lock(&osb->vote_task_lock); |
| 3203 | if (list_empty(&lockres->l_blocked_list)) { |
| 3204 | list_add_tail(&lockres->l_blocked_list, |
| 3205 | &osb->blocked_lock_list); |
| 3206 | osb->blocked_lock_count++; |
| 3207 | } |
| 3208 | spin_unlock(&osb->vote_task_lock); |
| 3209 | |
| 3210 | mlog_exit_void(); |
| 3211 | } |
| 3212 | |
| 3213 | /* This aids in debugging situations where a bad LVB might be involved. */ |
| 3214 | void ocfs2_dump_meta_lvb_info(u64 level, |
| 3215 | const char *function, |
| 3216 | unsigned int line, |
| 3217 | struct ocfs2_lock_res *lockres) |
| 3218 | { |
| 3219 | struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; |
| 3220 | |
| 3221 | mlog(level, "LVB information for %s (called from %s:%u):\n", |
| 3222 | lockres->l_name, function, line); |
Mark Fasheh | f9e2d82 | 2006-09-12 15:35:49 -0700 | [diff] [blame] | 3223 | mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", |
| 3224 | lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), |
| 3225 | be32_to_cpu(lvb->lvb_igeneration)); |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 3226 | mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", |
| 3227 | (unsigned long long)be64_to_cpu(lvb->lvb_isize), |
| 3228 | be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), |
| 3229 | be16_to_cpu(lvb->lvb_imode)); |
| 3230 | mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " |
Herbert Poetzl | ca4d147 | 2006-07-03 17:27:12 -0700 | [diff] [blame] | 3231 | "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), |
Mark Fasheh | b0697053 | 2006-03-03 10:24:33 -0800 | [diff] [blame] | 3232 | (long long)be64_to_cpu(lvb->lvb_iatime_packed), |
| 3233 | (long long)be64_to_cpu(lvb->lvb_ictime_packed), |
Herbert Poetzl | ca4d147 | 2006-07-03 17:27:12 -0700 | [diff] [blame] | 3234 | (long long)be64_to_cpu(lvb->lvb_imtime_packed), |
| 3235 | be32_to_cpu(lvb->lvb_iattr)); |
Mark Fasheh | ccd979b | 2005-12-15 14:31:24 -0800 | [diff] [blame] | 3236 | } |