1ccd979bdSMark Fasheh /* -*- mode: c; c-basic-offset: 8; -*- 2ccd979bdSMark Fasheh * vim: noexpandtab sw=8 ts=8 sts=0: 3ccd979bdSMark Fasheh * 4ccd979bdSMark Fasheh * dlmglue.c 5ccd979bdSMark Fasheh * 6ccd979bdSMark Fasheh * Code which implements an OCFS2 specific interface to our DLM. 7ccd979bdSMark Fasheh * 8ccd979bdSMark Fasheh * Copyright (C) 2003, 2004 Oracle. All rights reserved. 9ccd979bdSMark Fasheh * 10ccd979bdSMark Fasheh * This program is free software; you can redistribute it and/or 11ccd979bdSMark Fasheh * modify it under the terms of the GNU General Public 12ccd979bdSMark Fasheh * License as published by the Free Software Foundation; either 13ccd979bdSMark Fasheh * version 2 of the License, or (at your option) any later version. 14ccd979bdSMark Fasheh * 15ccd979bdSMark Fasheh * This program is distributed in the hope that it will be useful, 16ccd979bdSMark Fasheh * but WITHOUT ANY WARRANTY; without even the implied warranty of 17ccd979bdSMark Fasheh * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18ccd979bdSMark Fasheh * General Public License for more details. 19ccd979bdSMark Fasheh * 20ccd979bdSMark Fasheh * You should have received a copy of the GNU General Public 21ccd979bdSMark Fasheh * License along with this program; if not, write to the 22ccd979bdSMark Fasheh * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23ccd979bdSMark Fasheh * Boston, MA 021110-1307, USA. 24ccd979bdSMark Fasheh */ 25ccd979bdSMark Fasheh 26ccd979bdSMark Fasheh #include <linux/types.h> 27ccd979bdSMark Fasheh #include <linux/slab.h> 28ccd979bdSMark Fasheh #include <linux/highmem.h> 29ccd979bdSMark Fasheh #include <linux/mm.h> 30ccd979bdSMark Fasheh #include <linux/smp_lock.h> 31ccd979bdSMark Fasheh #include <linux/crc32.h> 32ccd979bdSMark Fasheh #include <linux/kthread.h> 33ccd979bdSMark Fasheh #include <linux/pagemap.h> 34ccd979bdSMark Fasheh #include <linux/debugfs.h> 35ccd979bdSMark Fasheh #include <linux/seq_file.h> 36ccd979bdSMark Fasheh 37ccd979bdSMark Fasheh #include <cluster/heartbeat.h> 38ccd979bdSMark Fasheh #include <cluster/nodemanager.h> 39ccd979bdSMark Fasheh #include <cluster/tcp.h> 40ccd979bdSMark Fasheh 41ccd979bdSMark Fasheh #include <dlm/dlmapi.h> 42ccd979bdSMark Fasheh 43ccd979bdSMark Fasheh #define MLOG_MASK_PREFIX ML_DLM_GLUE 44ccd979bdSMark Fasheh #include <cluster/masklog.h> 45ccd979bdSMark Fasheh 46ccd979bdSMark Fasheh #include "ocfs2.h" 47ccd979bdSMark Fasheh 48ccd979bdSMark Fasheh #include "alloc.h" 49d680efe9SMark Fasheh #include "dcache.h" 50ccd979bdSMark Fasheh #include "dlmglue.h" 51ccd979bdSMark Fasheh #include "extent_map.h" 527f1a37e3STiger Yang #include "file.h" 53ccd979bdSMark Fasheh #include "heartbeat.h" 54ccd979bdSMark Fasheh #include "inode.h" 55ccd979bdSMark Fasheh #include "journal.h" 56ccd979bdSMark Fasheh #include "slot_map.h" 57ccd979bdSMark Fasheh #include "super.h" 58ccd979bdSMark Fasheh #include "uptodate.h" 59ccd979bdSMark Fasheh #include "vote.h" 60ccd979bdSMark Fasheh 61ccd979bdSMark Fasheh #include "buffer_head_io.h" 62ccd979bdSMark Fasheh 63ccd979bdSMark Fasheh struct ocfs2_mask_waiter { 64ccd979bdSMark Fasheh struct list_head mw_item; 65ccd979bdSMark Fasheh int mw_status; 66ccd979bdSMark Fasheh struct completion mw_complete; 67ccd979bdSMark Fasheh unsigned long mw_mask; 68ccd979bdSMark Fasheh unsigned long mw_goal; 69ccd979bdSMark Fasheh }; 70ccd979bdSMark Fasheh 7154a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); 7254a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); 73ccd979bdSMark Fasheh 74d680efe9SMark Fasheh /* 75cc567d89SMark Fasheh * Return value from ->downconvert_worker functions. 76d680efe9SMark Fasheh * 77b5e500e2SMark Fasheh * These control the precise actions of ocfs2_unblock_lock() 78d680efe9SMark Fasheh * and ocfs2_process_blocked_lock() 79d680efe9SMark Fasheh * 80d680efe9SMark Fasheh */ 81d680efe9SMark Fasheh enum ocfs2_unblock_action { 82d680efe9SMark Fasheh UNBLOCK_CONTINUE = 0, /* Continue downconvert */ 83d680efe9SMark Fasheh UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire 84d680efe9SMark Fasheh * ->post_unlock callback */ 85d680efe9SMark Fasheh UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire 86d680efe9SMark Fasheh * ->post_unlock() callback. */ 87d680efe9SMark Fasheh }; 88d680efe9SMark Fasheh 89d680efe9SMark Fasheh struct ocfs2_unblock_ctl { 90d680efe9SMark Fasheh int requeue; 91d680efe9SMark Fasheh enum ocfs2_unblock_action unblock_action; 92d680efe9SMark Fasheh }; 93d680efe9SMark Fasheh 94810d5aebSMark Fasheh static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, 95810d5aebSMark Fasheh int new_level); 96810d5aebSMark Fasheh static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); 97810d5aebSMark Fasheh 98cc567d89SMark Fasheh static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, 99cc567d89SMark Fasheh int blocking); 100cc567d89SMark Fasheh 101cc567d89SMark Fasheh static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, 102cc567d89SMark Fasheh int blocking); 103d680efe9SMark Fasheh 104d680efe9SMark Fasheh static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 105d680efe9SMark Fasheh struct ocfs2_lock_res *lockres); 106ccd979bdSMark Fasheh 107f625c979SMark Fasheh /* 108f625c979SMark Fasheh * OCFS2 Lock Resource Operations 109f625c979SMark Fasheh * 110f625c979SMark Fasheh * These fine tune the behavior of the generic dlmglue locking infrastructure. 1110d5dc6c2SMark Fasheh * 1120d5dc6c2SMark Fasheh * The most basic of lock types can point ->l_priv to their respective 1130d5dc6c2SMark Fasheh * struct ocfs2_super and allow the default actions to manage things. 1140d5dc6c2SMark Fasheh * 1150d5dc6c2SMark Fasheh * Right now, each lock type also needs to implement an init function, 1160d5dc6c2SMark Fasheh * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() 1170d5dc6c2SMark Fasheh * should be called when the lock is no longer needed (i.e., object 1180d5dc6c2SMark Fasheh * destruction time). 119f625c979SMark Fasheh */ 120ccd979bdSMark Fasheh struct ocfs2_lock_res_ops { 12154a7e755SMark Fasheh /* 12254a7e755SMark Fasheh * Translate an ocfs2_lock_res * into an ocfs2_super *. Define 12354a7e755SMark Fasheh * this callback if ->l_priv is not an ocfs2_super pointer 12454a7e755SMark Fasheh */ 12554a7e755SMark Fasheh struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); 126b5e500e2SMark Fasheh 1270d5dc6c2SMark Fasheh /* 1280d5dc6c2SMark Fasheh * Optionally called in the downconvert (or "vote") thread 1290d5dc6c2SMark Fasheh * after a successful downconvert. The lockres will not be 1300d5dc6c2SMark Fasheh * referenced after this callback is called, so it is safe to 1310d5dc6c2SMark Fasheh * free memory, etc. 1320d5dc6c2SMark Fasheh * 1330d5dc6c2SMark Fasheh * The exact semantics of when this is called are controlled 1340d5dc6c2SMark Fasheh * by ->downconvert_worker() 1350d5dc6c2SMark Fasheh */ 136d680efe9SMark Fasheh void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); 137f625c979SMark Fasheh 138f625c979SMark Fasheh /* 13916d5b956SMark Fasheh * Allow a lock type to add checks to determine whether it is 14016d5b956SMark Fasheh * safe to downconvert a lock. Return 0 to re-queue the 14116d5b956SMark Fasheh * downconvert at a later time, nonzero to continue. 14216d5b956SMark Fasheh * 14316d5b956SMark Fasheh * For most locks, the default checks that there are no 14416d5b956SMark Fasheh * incompatible holders are sufficient. 14516d5b956SMark Fasheh * 14616d5b956SMark Fasheh * Called with the lockres spinlock held. 14716d5b956SMark Fasheh */ 14816d5b956SMark Fasheh int (*check_downconvert)(struct ocfs2_lock_res *, int); 14916d5b956SMark Fasheh 15016d5b956SMark Fasheh /* 1515ef0d4eaSMark Fasheh * Allows a lock type to populate the lock value block. This 1525ef0d4eaSMark Fasheh * is called on downconvert, and when we drop a lock. 1535ef0d4eaSMark Fasheh * 1545ef0d4eaSMark Fasheh * Locks that want to use this should set LOCK_TYPE_USES_LVB 1555ef0d4eaSMark Fasheh * in the flags field. 1565ef0d4eaSMark Fasheh * 1575ef0d4eaSMark Fasheh * Called with the lockres spinlock held. 1585ef0d4eaSMark Fasheh */ 1595ef0d4eaSMark Fasheh void (*set_lvb)(struct ocfs2_lock_res *); 1605ef0d4eaSMark Fasheh 1615ef0d4eaSMark Fasheh /* 162cc567d89SMark Fasheh * Called from the downconvert thread when it is determined 163cc567d89SMark Fasheh * that a lock will be downconverted. This is called without 164cc567d89SMark Fasheh * any locks held so the function can do work that might 165cc567d89SMark Fasheh * schedule (syncing out data, etc). 166cc567d89SMark Fasheh * 167cc567d89SMark Fasheh * This should return any one of the ocfs2_unblock_action 168cc567d89SMark Fasheh * values, depending on what it wants the thread to do. 169cc567d89SMark Fasheh */ 170cc567d89SMark Fasheh int (*downconvert_worker)(struct ocfs2_lock_res *, int); 171cc567d89SMark Fasheh 172cc567d89SMark Fasheh /* 173f625c979SMark Fasheh * LOCK_TYPE_* flags which describe the specific requirements 174f625c979SMark Fasheh * of a lock type. Descriptions of each individual flag follow. 175f625c979SMark Fasheh */ 176f625c979SMark Fasheh int flags; 177ccd979bdSMark Fasheh }; 178ccd979bdSMark Fasheh 179f625c979SMark Fasheh /* 180f625c979SMark Fasheh * Some locks want to "refresh" potentially stale data when a 181f625c979SMark Fasheh * meaningful (PRMODE or EXMODE) lock level is first obtained. If this 182f625c979SMark Fasheh * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the 183f625c979SMark Fasheh * individual lockres l_flags member from the ast function. It is 184f625c979SMark Fasheh * expected that the locking wrapper will clear the 185f625c979SMark Fasheh * OCFS2_LOCK_NEEDS_REFRESH flag when done. 186f625c979SMark Fasheh */ 187f625c979SMark Fasheh #define LOCK_TYPE_REQUIRES_REFRESH 0x1 188f625c979SMark Fasheh 189b80fc012SMark Fasheh /* 1905ef0d4eaSMark Fasheh * Indicate that a lock type makes use of the lock value block. The 1915ef0d4eaSMark Fasheh * ->set_lvb lock type callback must be defined. 192b80fc012SMark Fasheh */ 193b80fc012SMark Fasheh #define LOCK_TYPE_USES_LVB 0x2 194b80fc012SMark Fasheh 195ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { 19654a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 197f625c979SMark Fasheh .flags = 0, 198ccd979bdSMark Fasheh }; 199ccd979bdSMark Fasheh 200ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { 20154a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 202810d5aebSMark Fasheh .check_downconvert = ocfs2_check_meta_downconvert, 203810d5aebSMark Fasheh .set_lvb = ocfs2_set_meta_lvb, 204b80fc012SMark Fasheh .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, 205ccd979bdSMark Fasheh }; 206ccd979bdSMark Fasheh 207ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { 20854a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 209cc567d89SMark Fasheh .downconvert_worker = ocfs2_data_convert_worker, 210f625c979SMark Fasheh .flags = 0, 211ccd979bdSMark Fasheh }; 212ccd979bdSMark Fasheh 213ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_super_lops = { 214f625c979SMark Fasheh .flags = LOCK_TYPE_REQUIRES_REFRESH, 215ccd979bdSMark Fasheh }; 216ccd979bdSMark Fasheh 217ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_rename_lops = { 218f625c979SMark Fasheh .flags = 0, 219ccd979bdSMark Fasheh }; 220ccd979bdSMark Fasheh 221d680efe9SMark Fasheh static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { 22254a7e755SMark Fasheh .get_osb = ocfs2_get_dentry_osb, 223d680efe9SMark Fasheh .post_unlock = ocfs2_dentry_post_unlock, 224cc567d89SMark Fasheh .downconvert_worker = ocfs2_dentry_convert_worker, 225f625c979SMark Fasheh .flags = 0, 226d680efe9SMark Fasheh }; 227d680efe9SMark Fasheh 22850008630STiger Yang static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { 22950008630STiger Yang .get_osb = ocfs2_get_inode_osb, 23050008630STiger Yang .flags = 0, 23150008630STiger Yang }; 23250008630STiger Yang 233ccd979bdSMark Fasheh static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) 234ccd979bdSMark Fasheh { 235ccd979bdSMark Fasheh return lockres->l_type == OCFS2_LOCK_TYPE_META || 236ccd979bdSMark Fasheh lockres->l_type == OCFS2_LOCK_TYPE_DATA || 23750008630STiger Yang lockres->l_type == OCFS2_LOCK_TYPE_RW || 23850008630STiger Yang lockres->l_type == OCFS2_LOCK_TYPE_OPEN; 239ccd979bdSMark Fasheh } 240ccd979bdSMark Fasheh 241ccd979bdSMark Fasheh static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) 242ccd979bdSMark Fasheh { 243ccd979bdSMark Fasheh BUG_ON(!ocfs2_is_inode_lock(lockres)); 244ccd979bdSMark Fasheh 245ccd979bdSMark Fasheh return (struct inode *) lockres->l_priv; 246ccd979bdSMark Fasheh } 247ccd979bdSMark Fasheh 248d680efe9SMark Fasheh static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) 249d680efe9SMark Fasheh { 250d680efe9SMark Fasheh BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); 251d680efe9SMark Fasheh 252d680efe9SMark Fasheh return (struct ocfs2_dentry_lock *)lockres->l_priv; 253d680efe9SMark Fasheh } 254d680efe9SMark Fasheh 25554a7e755SMark Fasheh static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) 25654a7e755SMark Fasheh { 25754a7e755SMark Fasheh if (lockres->l_ops->get_osb) 25854a7e755SMark Fasheh return lockres->l_ops->get_osb(lockres); 25954a7e755SMark Fasheh 26054a7e755SMark Fasheh return (struct ocfs2_super *)lockres->l_priv; 26154a7e755SMark Fasheh } 26254a7e755SMark Fasheh 263ccd979bdSMark Fasheh static int ocfs2_lock_create(struct ocfs2_super *osb, 264ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 265ccd979bdSMark Fasheh int level, 266ccd979bdSMark Fasheh int dlm_flags); 267ccd979bdSMark Fasheh static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 268ccd979bdSMark Fasheh int wanted); 269ccd979bdSMark Fasheh static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 270ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 271ccd979bdSMark Fasheh int level); 272ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); 273ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); 274ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); 275ccd979bdSMark Fasheh static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); 276ccd979bdSMark Fasheh static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 277ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres); 278ccd979bdSMark Fasheh static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 279ccd979bdSMark Fasheh int convert); 280ccd979bdSMark Fasheh #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ 281ccd979bdSMark Fasheh mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ 282ccd979bdSMark Fasheh "resource %s: %s\n", dlm_errname(_stat), _func, \ 283ccd979bdSMark Fasheh _lockres->l_name, dlm_errmsg(_stat)); \ 284ccd979bdSMark Fasheh } while (0) 285ccd979bdSMark Fasheh static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 286ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres); 287ccd979bdSMark Fasheh static int ocfs2_meta_lock_update(struct inode *inode, 288ccd979bdSMark Fasheh struct buffer_head **bh); 289ccd979bdSMark Fasheh static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); 290ccd979bdSMark Fasheh static inline int ocfs2_highest_compat_lock_level(int level); 291ccd979bdSMark Fasheh 292ccd979bdSMark Fasheh static void ocfs2_build_lock_name(enum ocfs2_lock_type type, 293ccd979bdSMark Fasheh u64 blkno, 294ccd979bdSMark Fasheh u32 generation, 295ccd979bdSMark Fasheh char *name) 296ccd979bdSMark Fasheh { 297ccd979bdSMark Fasheh int len; 298ccd979bdSMark Fasheh 299ccd979bdSMark Fasheh mlog_entry_void(); 300ccd979bdSMark Fasheh 301ccd979bdSMark Fasheh BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); 302ccd979bdSMark Fasheh 303b0697053SMark Fasheh len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", 304b0697053SMark Fasheh ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, 305b0697053SMark Fasheh (long long)blkno, generation); 306ccd979bdSMark Fasheh 307ccd979bdSMark Fasheh BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); 308ccd979bdSMark Fasheh 309ccd979bdSMark Fasheh mlog(0, "built lock resource with name: %s\n", name); 310ccd979bdSMark Fasheh 311ccd979bdSMark Fasheh mlog_exit_void(); 312ccd979bdSMark Fasheh } 313ccd979bdSMark Fasheh 31434af946aSIngo Molnar static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); 315ccd979bdSMark Fasheh 316ccd979bdSMark Fasheh static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, 317ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug) 318ccd979bdSMark Fasheh { 319ccd979bdSMark Fasheh mlog(0, "Add tracking for lockres %s\n", res->l_name); 320ccd979bdSMark Fasheh 321ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 322ccd979bdSMark Fasheh list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); 323ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 324ccd979bdSMark Fasheh } 325ccd979bdSMark Fasheh 326ccd979bdSMark Fasheh static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) 327ccd979bdSMark Fasheh { 328ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 329ccd979bdSMark Fasheh if (!list_empty(&res->l_debug_list)) 330ccd979bdSMark Fasheh list_del_init(&res->l_debug_list); 331ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 332ccd979bdSMark Fasheh } 333ccd979bdSMark Fasheh 334ccd979bdSMark Fasheh static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, 335ccd979bdSMark Fasheh struct ocfs2_lock_res *res, 336ccd979bdSMark Fasheh enum ocfs2_lock_type type, 337ccd979bdSMark Fasheh struct ocfs2_lock_res_ops *ops, 338ccd979bdSMark Fasheh void *priv) 339ccd979bdSMark Fasheh { 340ccd979bdSMark Fasheh res->l_type = type; 341ccd979bdSMark Fasheh res->l_ops = ops; 342ccd979bdSMark Fasheh res->l_priv = priv; 343ccd979bdSMark Fasheh 344ccd979bdSMark Fasheh res->l_level = LKM_IVMODE; 345ccd979bdSMark Fasheh res->l_requested = LKM_IVMODE; 346ccd979bdSMark Fasheh res->l_blocking = LKM_IVMODE; 347ccd979bdSMark Fasheh res->l_action = OCFS2_AST_INVALID; 348ccd979bdSMark Fasheh res->l_unlock_action = OCFS2_UNLOCK_INVALID; 349ccd979bdSMark Fasheh 350ccd979bdSMark Fasheh res->l_flags = OCFS2_LOCK_INITIALIZED; 351ccd979bdSMark Fasheh 352ccd979bdSMark Fasheh ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); 353ccd979bdSMark Fasheh } 354ccd979bdSMark Fasheh 355ccd979bdSMark Fasheh void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) 356ccd979bdSMark Fasheh { 357ccd979bdSMark Fasheh /* This also clears out the lock status block */ 358ccd979bdSMark Fasheh memset(res, 0, sizeof(struct ocfs2_lock_res)); 359ccd979bdSMark Fasheh spin_lock_init(&res->l_lock); 360ccd979bdSMark Fasheh init_waitqueue_head(&res->l_event); 361ccd979bdSMark Fasheh INIT_LIST_HEAD(&res->l_blocked_list); 362ccd979bdSMark Fasheh INIT_LIST_HEAD(&res->l_mask_waiters); 363ccd979bdSMark Fasheh } 364ccd979bdSMark Fasheh 365ccd979bdSMark Fasheh void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, 366ccd979bdSMark Fasheh enum ocfs2_lock_type type, 36724c19ef4SMark Fasheh unsigned int generation, 368ccd979bdSMark Fasheh struct inode *inode) 369ccd979bdSMark Fasheh { 370ccd979bdSMark Fasheh struct ocfs2_lock_res_ops *ops; 371ccd979bdSMark Fasheh 372ccd979bdSMark Fasheh switch(type) { 373ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_RW: 374ccd979bdSMark Fasheh ops = &ocfs2_inode_rw_lops; 375ccd979bdSMark Fasheh break; 376ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_META: 377ccd979bdSMark Fasheh ops = &ocfs2_inode_meta_lops; 378ccd979bdSMark Fasheh break; 379ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_DATA: 380ccd979bdSMark Fasheh ops = &ocfs2_inode_data_lops; 381ccd979bdSMark Fasheh break; 38250008630STiger Yang case OCFS2_LOCK_TYPE_OPEN: 38350008630STiger Yang ops = &ocfs2_inode_open_lops; 38450008630STiger Yang break; 385ccd979bdSMark Fasheh default: 386ccd979bdSMark Fasheh mlog_bug_on_msg(1, "type: %d\n", type); 387ccd979bdSMark Fasheh ops = NULL; /* thanks, gcc */ 388ccd979bdSMark Fasheh break; 389ccd979bdSMark Fasheh }; 390ccd979bdSMark Fasheh 391d680efe9SMark Fasheh ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, 39224c19ef4SMark Fasheh generation, res->l_name); 393d680efe9SMark Fasheh ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); 394d680efe9SMark Fasheh } 395d680efe9SMark Fasheh 39654a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) 39754a7e755SMark Fasheh { 39854a7e755SMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 39954a7e755SMark Fasheh 40054a7e755SMark Fasheh return OCFS2_SB(inode->i_sb); 40154a7e755SMark Fasheh } 40254a7e755SMark Fasheh 403d680efe9SMark Fasheh static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) 404d680efe9SMark Fasheh { 405d680efe9SMark Fasheh __be64 inode_blkno_be; 406d680efe9SMark Fasheh 407d680efe9SMark Fasheh memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], 408d680efe9SMark Fasheh sizeof(__be64)); 409d680efe9SMark Fasheh 410d680efe9SMark Fasheh return be64_to_cpu(inode_blkno_be); 411d680efe9SMark Fasheh } 412d680efe9SMark Fasheh 41354a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) 41454a7e755SMark Fasheh { 41554a7e755SMark Fasheh struct ocfs2_dentry_lock *dl = lockres->l_priv; 41654a7e755SMark Fasheh 41754a7e755SMark Fasheh return OCFS2_SB(dl->dl_inode->i_sb); 41854a7e755SMark Fasheh } 41954a7e755SMark Fasheh 420d680efe9SMark Fasheh void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, 421d680efe9SMark Fasheh u64 parent, struct inode *inode) 422d680efe9SMark Fasheh { 423d680efe9SMark Fasheh int len; 424d680efe9SMark Fasheh u64 inode_blkno = OCFS2_I(inode)->ip_blkno; 425d680efe9SMark Fasheh __be64 inode_blkno_be = cpu_to_be64(inode_blkno); 426d680efe9SMark Fasheh struct ocfs2_lock_res *lockres = &dl->dl_lockres; 427d680efe9SMark Fasheh 428d680efe9SMark Fasheh ocfs2_lock_res_init_once(lockres); 429d680efe9SMark Fasheh 430d680efe9SMark Fasheh /* 431d680efe9SMark Fasheh * Unfortunately, the standard lock naming scheme won't work 432d680efe9SMark Fasheh * here because we have two 16 byte values to use. Instead, 433d680efe9SMark Fasheh * we'll stuff the inode number as a binary value. We still 434d680efe9SMark Fasheh * want error prints to show something without garbling the 435d680efe9SMark Fasheh * display, so drop a null byte in there before the inode 436d680efe9SMark Fasheh * number. A future version of OCFS2 will likely use all 437d680efe9SMark Fasheh * binary lock names. The stringified names have been a 438d680efe9SMark Fasheh * tremendous aid in debugging, but now that the debugfs 439d680efe9SMark Fasheh * interface exists, we can mangle things there if need be. 440d680efe9SMark Fasheh * 441d680efe9SMark Fasheh * NOTE: We also drop the standard "pad" value (the total lock 442d680efe9SMark Fasheh * name size stays the same though - the last part is all 443d680efe9SMark Fasheh * zeros due to the memset in ocfs2_lock_res_init_once() 444d680efe9SMark Fasheh */ 445d680efe9SMark Fasheh len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, 446d680efe9SMark Fasheh "%c%016llx", 447d680efe9SMark Fasheh ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), 448d680efe9SMark Fasheh (long long)parent); 449d680efe9SMark Fasheh 450d680efe9SMark Fasheh BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); 451d680efe9SMark Fasheh 452d680efe9SMark Fasheh memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, 453d680efe9SMark Fasheh sizeof(__be64)); 454d680efe9SMark Fasheh 455d680efe9SMark Fasheh ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, 456d680efe9SMark Fasheh OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, 457d680efe9SMark Fasheh dl); 458ccd979bdSMark Fasheh } 459ccd979bdSMark Fasheh 460ccd979bdSMark Fasheh static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, 461ccd979bdSMark Fasheh struct ocfs2_super *osb) 462ccd979bdSMark Fasheh { 463ccd979bdSMark Fasheh /* Superblock lockres doesn't come from a slab so we call init 464ccd979bdSMark Fasheh * once on it manually. */ 465ccd979bdSMark Fasheh ocfs2_lock_res_init_once(res); 466d680efe9SMark Fasheh ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, 467d680efe9SMark Fasheh 0, res->l_name); 468ccd979bdSMark Fasheh ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, 469ccd979bdSMark Fasheh &ocfs2_super_lops, osb); 470ccd979bdSMark Fasheh } 471ccd979bdSMark Fasheh 472ccd979bdSMark Fasheh static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, 473ccd979bdSMark Fasheh struct ocfs2_super *osb) 474ccd979bdSMark Fasheh { 475ccd979bdSMark Fasheh /* Rename lockres doesn't come from a slab so we call init 476ccd979bdSMark Fasheh * once on it manually. */ 477ccd979bdSMark Fasheh ocfs2_lock_res_init_once(res); 478d680efe9SMark Fasheh ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); 479d680efe9SMark Fasheh ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 480ccd979bdSMark Fasheh &ocfs2_rename_lops, osb); 481ccd979bdSMark Fasheh } 482ccd979bdSMark Fasheh 483ccd979bdSMark Fasheh void ocfs2_lock_res_free(struct ocfs2_lock_res *res) 484ccd979bdSMark Fasheh { 485ccd979bdSMark Fasheh mlog_entry_void(); 486ccd979bdSMark Fasheh 487ccd979bdSMark Fasheh if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) 488ccd979bdSMark Fasheh return; 489ccd979bdSMark Fasheh 490ccd979bdSMark Fasheh ocfs2_remove_lockres_tracking(res); 491ccd979bdSMark Fasheh 492ccd979bdSMark Fasheh mlog_bug_on_msg(!list_empty(&res->l_blocked_list), 493ccd979bdSMark Fasheh "Lockres %s is on the blocked list\n", 494ccd979bdSMark Fasheh res->l_name); 495ccd979bdSMark Fasheh mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), 496ccd979bdSMark Fasheh "Lockres %s has mask waiters pending\n", 497ccd979bdSMark Fasheh res->l_name); 498ccd979bdSMark Fasheh mlog_bug_on_msg(spin_is_locked(&res->l_lock), 499ccd979bdSMark Fasheh "Lockres %s is locked\n", 500ccd979bdSMark Fasheh res->l_name); 501ccd979bdSMark Fasheh mlog_bug_on_msg(res->l_ro_holders, 502ccd979bdSMark Fasheh "Lockres %s has %u ro holders\n", 503ccd979bdSMark Fasheh res->l_name, res->l_ro_holders); 504ccd979bdSMark Fasheh mlog_bug_on_msg(res->l_ex_holders, 505ccd979bdSMark Fasheh "Lockres %s has %u ex holders\n", 506ccd979bdSMark Fasheh res->l_name, res->l_ex_holders); 507ccd979bdSMark Fasheh 508ccd979bdSMark Fasheh /* Need to clear out the lock status block for the dlm */ 509ccd979bdSMark Fasheh memset(&res->l_lksb, 0, sizeof(res->l_lksb)); 510ccd979bdSMark Fasheh 511ccd979bdSMark Fasheh res->l_flags = 0UL; 512ccd979bdSMark Fasheh mlog_exit_void(); 513ccd979bdSMark Fasheh } 514ccd979bdSMark Fasheh 515ccd979bdSMark Fasheh static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, 516ccd979bdSMark Fasheh int level) 517ccd979bdSMark Fasheh { 518ccd979bdSMark Fasheh mlog_entry_void(); 519ccd979bdSMark Fasheh 520ccd979bdSMark Fasheh BUG_ON(!lockres); 521ccd979bdSMark Fasheh 522ccd979bdSMark Fasheh switch(level) { 523ccd979bdSMark Fasheh case LKM_EXMODE: 524ccd979bdSMark Fasheh lockres->l_ex_holders++; 525ccd979bdSMark Fasheh break; 526ccd979bdSMark Fasheh case LKM_PRMODE: 527ccd979bdSMark Fasheh lockres->l_ro_holders++; 528ccd979bdSMark Fasheh break; 529ccd979bdSMark Fasheh default: 530ccd979bdSMark Fasheh BUG(); 531ccd979bdSMark Fasheh } 532ccd979bdSMark Fasheh 533ccd979bdSMark Fasheh mlog_exit_void(); 534ccd979bdSMark Fasheh } 535ccd979bdSMark Fasheh 536ccd979bdSMark Fasheh static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, 537ccd979bdSMark Fasheh int level) 538ccd979bdSMark Fasheh { 539ccd979bdSMark Fasheh mlog_entry_void(); 540ccd979bdSMark Fasheh 541ccd979bdSMark Fasheh BUG_ON(!lockres); 542ccd979bdSMark Fasheh 543ccd979bdSMark Fasheh switch(level) { 544ccd979bdSMark Fasheh case LKM_EXMODE: 545ccd979bdSMark Fasheh BUG_ON(!lockres->l_ex_holders); 546ccd979bdSMark Fasheh lockres->l_ex_holders--; 547ccd979bdSMark Fasheh break; 548ccd979bdSMark Fasheh case LKM_PRMODE: 549ccd979bdSMark Fasheh BUG_ON(!lockres->l_ro_holders); 550ccd979bdSMark Fasheh lockres->l_ro_holders--; 551ccd979bdSMark Fasheh break; 552ccd979bdSMark Fasheh default: 553ccd979bdSMark Fasheh BUG(); 554ccd979bdSMark Fasheh } 555ccd979bdSMark Fasheh mlog_exit_void(); 556ccd979bdSMark Fasheh } 557ccd979bdSMark Fasheh 558ccd979bdSMark Fasheh /* WARNING: This function lives in a world where the only three lock 559ccd979bdSMark Fasheh * levels are EX, PR, and NL. It *will* have to be adjusted when more 560ccd979bdSMark Fasheh * lock types are added. */ 561ccd979bdSMark Fasheh static inline int ocfs2_highest_compat_lock_level(int level) 562ccd979bdSMark Fasheh { 563ccd979bdSMark Fasheh int new_level = LKM_EXMODE; 564ccd979bdSMark Fasheh 565ccd979bdSMark Fasheh if (level == LKM_EXMODE) 566ccd979bdSMark Fasheh new_level = LKM_NLMODE; 567ccd979bdSMark Fasheh else if (level == LKM_PRMODE) 568ccd979bdSMark Fasheh new_level = LKM_PRMODE; 569ccd979bdSMark Fasheh return new_level; 570ccd979bdSMark Fasheh } 571ccd979bdSMark Fasheh 572ccd979bdSMark Fasheh static void lockres_set_flags(struct ocfs2_lock_res *lockres, 573ccd979bdSMark Fasheh unsigned long newflags) 574ccd979bdSMark Fasheh { 575ccd979bdSMark Fasheh struct list_head *pos, *tmp; 576ccd979bdSMark Fasheh struct ocfs2_mask_waiter *mw; 577ccd979bdSMark Fasheh 578ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 579ccd979bdSMark Fasheh 580ccd979bdSMark Fasheh lockres->l_flags = newflags; 581ccd979bdSMark Fasheh 582ccd979bdSMark Fasheh list_for_each_safe(pos, tmp, &lockres->l_mask_waiters) { 583ccd979bdSMark Fasheh mw = list_entry(pos, struct ocfs2_mask_waiter, mw_item); 584ccd979bdSMark Fasheh if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 585ccd979bdSMark Fasheh continue; 586ccd979bdSMark Fasheh 587ccd979bdSMark Fasheh list_del_init(&mw->mw_item); 588ccd979bdSMark Fasheh mw->mw_status = 0; 589ccd979bdSMark Fasheh complete(&mw->mw_complete); 590ccd979bdSMark Fasheh } 591ccd979bdSMark Fasheh } 592ccd979bdSMark Fasheh static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) 593ccd979bdSMark Fasheh { 594ccd979bdSMark Fasheh lockres_set_flags(lockres, lockres->l_flags | or); 595ccd979bdSMark Fasheh } 596ccd979bdSMark Fasheh static void lockres_clear_flags(struct ocfs2_lock_res *lockres, 597ccd979bdSMark Fasheh unsigned long clear) 598ccd979bdSMark Fasheh { 599ccd979bdSMark Fasheh lockres_set_flags(lockres, lockres->l_flags & ~clear); 600ccd979bdSMark Fasheh } 601ccd979bdSMark Fasheh 602ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) 603ccd979bdSMark Fasheh { 604ccd979bdSMark Fasheh mlog_entry_void(); 605ccd979bdSMark Fasheh 606ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 607ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 608ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 609ccd979bdSMark Fasheh BUG_ON(lockres->l_blocking <= LKM_NLMODE); 610ccd979bdSMark Fasheh 611ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 612ccd979bdSMark Fasheh if (lockres->l_level <= 613ccd979bdSMark Fasheh ocfs2_highest_compat_lock_level(lockres->l_blocking)) { 614ccd979bdSMark Fasheh lockres->l_blocking = LKM_NLMODE; 615ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); 616ccd979bdSMark Fasheh } 617ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 618ccd979bdSMark Fasheh 619ccd979bdSMark Fasheh mlog_exit_void(); 620ccd979bdSMark Fasheh } 621ccd979bdSMark Fasheh 622ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) 623ccd979bdSMark Fasheh { 624ccd979bdSMark Fasheh mlog_entry_void(); 625ccd979bdSMark Fasheh 626ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 627ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 628ccd979bdSMark Fasheh 629ccd979bdSMark Fasheh /* Convert from RO to EX doesn't really need anything as our 630ccd979bdSMark Fasheh * information is already up to data. Convert from NL to 631ccd979bdSMark Fasheh * *anything* however should mark ourselves as needing an 632ccd979bdSMark Fasheh * update */ 633f625c979SMark Fasheh if (lockres->l_level == LKM_NLMODE && 634f625c979SMark Fasheh lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 635ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 636ccd979bdSMark Fasheh 637ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 638ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 639ccd979bdSMark Fasheh 640ccd979bdSMark Fasheh mlog_exit_void(); 641ccd979bdSMark Fasheh } 642ccd979bdSMark Fasheh 643ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) 644ccd979bdSMark Fasheh { 645ccd979bdSMark Fasheh mlog_entry_void(); 646ccd979bdSMark Fasheh 647ccd979bdSMark Fasheh BUG_ON((!lockres->l_flags & OCFS2_LOCK_BUSY)); 648ccd979bdSMark Fasheh BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 649ccd979bdSMark Fasheh 650ccd979bdSMark Fasheh if (lockres->l_requested > LKM_NLMODE && 651f625c979SMark Fasheh !(lockres->l_flags & OCFS2_LOCK_LOCAL) && 652f625c979SMark Fasheh lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 653ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 654ccd979bdSMark Fasheh 655ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 656ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); 657ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 658ccd979bdSMark Fasheh 659ccd979bdSMark Fasheh mlog_exit_void(); 660ccd979bdSMark Fasheh } 661ccd979bdSMark Fasheh 662ccd979bdSMark Fasheh static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, 663ccd979bdSMark Fasheh int level) 664ccd979bdSMark Fasheh { 665ccd979bdSMark Fasheh int needs_downconvert = 0; 666ccd979bdSMark Fasheh mlog_entry_void(); 667ccd979bdSMark Fasheh 668ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 669ccd979bdSMark Fasheh 670ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); 671ccd979bdSMark Fasheh 672ccd979bdSMark Fasheh if (level > lockres->l_blocking) { 673ccd979bdSMark Fasheh /* only schedule a downconvert if we haven't already scheduled 674ccd979bdSMark Fasheh * one that goes low enough to satisfy the level we're 675ccd979bdSMark Fasheh * blocking. this also catches the case where we get 676ccd979bdSMark Fasheh * duplicate BASTs */ 677ccd979bdSMark Fasheh if (ocfs2_highest_compat_lock_level(level) < 678ccd979bdSMark Fasheh ocfs2_highest_compat_lock_level(lockres->l_blocking)) 679ccd979bdSMark Fasheh needs_downconvert = 1; 680ccd979bdSMark Fasheh 681ccd979bdSMark Fasheh lockres->l_blocking = level; 682ccd979bdSMark Fasheh } 683ccd979bdSMark Fasheh 684ccd979bdSMark Fasheh mlog_exit(needs_downconvert); 685ccd979bdSMark Fasheh return needs_downconvert; 686ccd979bdSMark Fasheh } 687ccd979bdSMark Fasheh 688aa2623adSMark Fasheh static void ocfs2_blocking_ast(void *opaque, int level) 689ccd979bdSMark Fasheh { 690aa2623adSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 691aa2623adSMark Fasheh struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); 692ccd979bdSMark Fasheh int needs_downconvert; 693ccd979bdSMark Fasheh unsigned long flags; 694ccd979bdSMark Fasheh 695ccd979bdSMark Fasheh BUG_ON(level <= LKM_NLMODE); 696ccd979bdSMark Fasheh 697aa2623adSMark Fasheh mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", 698aa2623adSMark Fasheh lockres->l_name, level, lockres->l_level, 699aa2623adSMark Fasheh ocfs2_lock_type_string(lockres->l_type)); 700aa2623adSMark Fasheh 701ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 702ccd979bdSMark Fasheh needs_downconvert = ocfs2_generic_handle_bast(lockres, level); 703ccd979bdSMark Fasheh if (needs_downconvert) 704ccd979bdSMark Fasheh ocfs2_schedule_blocked_lock(osb, lockres); 705ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 706ccd979bdSMark Fasheh 707d680efe9SMark Fasheh wake_up(&lockres->l_event); 708d680efe9SMark Fasheh 709ccd979bdSMark Fasheh ocfs2_kick_vote_thread(osb); 710ccd979bdSMark Fasheh } 711ccd979bdSMark Fasheh 712e92d57dfSMark Fasheh static void ocfs2_locking_ast(void *opaque) 713ccd979bdSMark Fasheh { 714e92d57dfSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 715ccd979bdSMark Fasheh struct dlm_lockstatus *lksb = &lockres->l_lksb; 716ccd979bdSMark Fasheh unsigned long flags; 717ccd979bdSMark Fasheh 718ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 719ccd979bdSMark Fasheh 720ccd979bdSMark Fasheh if (lksb->status != DLM_NORMAL) { 721ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", 722ccd979bdSMark Fasheh lockres->l_name, lksb->status); 723ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 724ccd979bdSMark Fasheh return; 725ccd979bdSMark Fasheh } 726ccd979bdSMark Fasheh 727ccd979bdSMark Fasheh switch(lockres->l_action) { 728ccd979bdSMark Fasheh case OCFS2_AST_ATTACH: 729ccd979bdSMark Fasheh ocfs2_generic_handle_attach_action(lockres); 730e92d57dfSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); 731ccd979bdSMark Fasheh break; 732ccd979bdSMark Fasheh case OCFS2_AST_CONVERT: 733ccd979bdSMark Fasheh ocfs2_generic_handle_convert_action(lockres); 734ccd979bdSMark Fasheh break; 735ccd979bdSMark Fasheh case OCFS2_AST_DOWNCONVERT: 736ccd979bdSMark Fasheh ocfs2_generic_handle_downconvert_action(lockres); 737ccd979bdSMark Fasheh break; 738ccd979bdSMark Fasheh default: 739e92d57dfSMark Fasheh mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " 740e92d57dfSMark Fasheh "lockres flags = 0x%lx, unlock action: %u\n", 741e92d57dfSMark Fasheh lockres->l_name, lockres->l_action, lockres->l_flags, 742e92d57dfSMark Fasheh lockres->l_unlock_action); 743ccd979bdSMark Fasheh BUG(); 744ccd979bdSMark Fasheh } 745ccd979bdSMark Fasheh 746ccd979bdSMark Fasheh /* set it to something invalid so if we get called again we 747ccd979bdSMark Fasheh * can catch it. */ 748ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 749ccd979bdSMark Fasheh 750ccd979bdSMark Fasheh wake_up(&lockres->l_event); 751d680efe9SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 752ccd979bdSMark Fasheh } 753ccd979bdSMark Fasheh 754ccd979bdSMark Fasheh static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 755ccd979bdSMark Fasheh int convert) 756ccd979bdSMark Fasheh { 757ccd979bdSMark Fasheh unsigned long flags; 758ccd979bdSMark Fasheh 759ccd979bdSMark Fasheh mlog_entry_void(); 760ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 761ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 762ccd979bdSMark Fasheh if (convert) 763ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 764ccd979bdSMark Fasheh else 765ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 766ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 767ccd979bdSMark Fasheh 768ccd979bdSMark Fasheh wake_up(&lockres->l_event); 769ccd979bdSMark Fasheh mlog_exit_void(); 770ccd979bdSMark Fasheh } 771ccd979bdSMark Fasheh 772ccd979bdSMark Fasheh /* Note: If we detect another process working on the lock (i.e., 773ccd979bdSMark Fasheh * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller 774ccd979bdSMark Fasheh * to do the right thing in that case. 775ccd979bdSMark Fasheh */ 776ccd979bdSMark Fasheh static int ocfs2_lock_create(struct ocfs2_super *osb, 777ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 778ccd979bdSMark Fasheh int level, 779ccd979bdSMark Fasheh int dlm_flags) 780ccd979bdSMark Fasheh { 781ccd979bdSMark Fasheh int ret = 0; 782c271c5c2SSunil Mushran enum dlm_status status = DLM_NORMAL; 783ccd979bdSMark Fasheh unsigned long flags; 784ccd979bdSMark Fasheh 785ccd979bdSMark Fasheh mlog_entry_void(); 786ccd979bdSMark Fasheh 787ccd979bdSMark Fasheh mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, 788ccd979bdSMark Fasheh dlm_flags); 789ccd979bdSMark Fasheh 790ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 791ccd979bdSMark Fasheh if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || 792ccd979bdSMark Fasheh (lockres->l_flags & OCFS2_LOCK_BUSY)) { 793ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 794ccd979bdSMark Fasheh goto bail; 795ccd979bdSMark Fasheh } 796ccd979bdSMark Fasheh 797ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_ATTACH; 798ccd979bdSMark Fasheh lockres->l_requested = level; 799ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 800ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 801ccd979bdSMark Fasheh 802ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 803ccd979bdSMark Fasheh level, 804ccd979bdSMark Fasheh &lockres->l_lksb, 805ccd979bdSMark Fasheh dlm_flags, 806ccd979bdSMark Fasheh lockres->l_name, 807f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 808e92d57dfSMark Fasheh ocfs2_locking_ast, 809ccd979bdSMark Fasheh lockres, 810aa2623adSMark Fasheh ocfs2_blocking_ast); 811ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 812ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, lockres); 813ccd979bdSMark Fasheh ret = -EINVAL; 814ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 815ccd979bdSMark Fasheh } 816ccd979bdSMark Fasheh 817ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); 818ccd979bdSMark Fasheh 819ccd979bdSMark Fasheh bail: 820ccd979bdSMark Fasheh mlog_exit(ret); 821ccd979bdSMark Fasheh return ret; 822ccd979bdSMark Fasheh } 823ccd979bdSMark Fasheh 824ccd979bdSMark Fasheh static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, 825ccd979bdSMark Fasheh int flag) 826ccd979bdSMark Fasheh { 827ccd979bdSMark Fasheh unsigned long flags; 828ccd979bdSMark Fasheh int ret; 829ccd979bdSMark Fasheh 830ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 831ccd979bdSMark Fasheh ret = lockres->l_flags & flag; 832ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 833ccd979bdSMark Fasheh 834ccd979bdSMark Fasheh return ret; 835ccd979bdSMark Fasheh } 836ccd979bdSMark Fasheh 837ccd979bdSMark Fasheh static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) 838ccd979bdSMark Fasheh 839ccd979bdSMark Fasheh { 840ccd979bdSMark Fasheh wait_event(lockres->l_event, 841ccd979bdSMark Fasheh !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); 842ccd979bdSMark Fasheh } 843ccd979bdSMark Fasheh 844ccd979bdSMark Fasheh static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) 845ccd979bdSMark Fasheh 846ccd979bdSMark Fasheh { 847ccd979bdSMark Fasheh wait_event(lockres->l_event, 848ccd979bdSMark Fasheh !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); 849ccd979bdSMark Fasheh } 850ccd979bdSMark Fasheh 851ccd979bdSMark Fasheh /* predict what lock level we'll be dropping down to on behalf 852ccd979bdSMark Fasheh * of another node, and return true if the currently wanted 853ccd979bdSMark Fasheh * level will be compatible with it. */ 854ccd979bdSMark Fasheh static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 855ccd979bdSMark Fasheh int wanted) 856ccd979bdSMark Fasheh { 857ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 858ccd979bdSMark Fasheh 859ccd979bdSMark Fasheh return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); 860ccd979bdSMark Fasheh } 861ccd979bdSMark Fasheh 862ccd979bdSMark Fasheh static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) 863ccd979bdSMark Fasheh { 864ccd979bdSMark Fasheh INIT_LIST_HEAD(&mw->mw_item); 865ccd979bdSMark Fasheh init_completion(&mw->mw_complete); 866ccd979bdSMark Fasheh } 867ccd979bdSMark Fasheh 868ccd979bdSMark Fasheh static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) 869ccd979bdSMark Fasheh { 870ccd979bdSMark Fasheh wait_for_completion(&mw->mw_complete); 871ccd979bdSMark Fasheh /* Re-arm the completion in case we want to wait on it again */ 872ccd979bdSMark Fasheh INIT_COMPLETION(mw->mw_complete); 873ccd979bdSMark Fasheh return mw->mw_status; 874ccd979bdSMark Fasheh } 875ccd979bdSMark Fasheh 876ccd979bdSMark Fasheh static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, 877ccd979bdSMark Fasheh struct ocfs2_mask_waiter *mw, 878ccd979bdSMark Fasheh unsigned long mask, 879ccd979bdSMark Fasheh unsigned long goal) 880ccd979bdSMark Fasheh { 881ccd979bdSMark Fasheh BUG_ON(!list_empty(&mw->mw_item)); 882ccd979bdSMark Fasheh 883ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 884ccd979bdSMark Fasheh 885ccd979bdSMark Fasheh list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); 886ccd979bdSMark Fasheh mw->mw_mask = mask; 887ccd979bdSMark Fasheh mw->mw_goal = goal; 888ccd979bdSMark Fasheh } 889ccd979bdSMark Fasheh 890ccd979bdSMark Fasheh /* returns 0 if the mw that was removed was already satisfied, -EBUSY 891ccd979bdSMark Fasheh * if the mask still hadn't reached its goal */ 892ccd979bdSMark Fasheh static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, 893ccd979bdSMark Fasheh struct ocfs2_mask_waiter *mw) 894ccd979bdSMark Fasheh { 895ccd979bdSMark Fasheh unsigned long flags; 896ccd979bdSMark Fasheh int ret = 0; 897ccd979bdSMark Fasheh 898ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 899ccd979bdSMark Fasheh if (!list_empty(&mw->mw_item)) { 900ccd979bdSMark Fasheh if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 901ccd979bdSMark Fasheh ret = -EBUSY; 902ccd979bdSMark Fasheh 903ccd979bdSMark Fasheh list_del_init(&mw->mw_item); 904ccd979bdSMark Fasheh init_completion(&mw->mw_complete); 905ccd979bdSMark Fasheh } 906ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 907ccd979bdSMark Fasheh 908ccd979bdSMark Fasheh return ret; 909ccd979bdSMark Fasheh 910ccd979bdSMark Fasheh } 911ccd979bdSMark Fasheh 912ccd979bdSMark Fasheh static int ocfs2_cluster_lock(struct ocfs2_super *osb, 913ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 914ccd979bdSMark Fasheh int level, 915ccd979bdSMark Fasheh int lkm_flags, 916ccd979bdSMark Fasheh int arg_flags) 917ccd979bdSMark Fasheh { 918ccd979bdSMark Fasheh struct ocfs2_mask_waiter mw; 919ccd979bdSMark Fasheh enum dlm_status status; 920ccd979bdSMark Fasheh int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); 921ccd979bdSMark Fasheh int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ 922ccd979bdSMark Fasheh unsigned long flags; 923ccd979bdSMark Fasheh 924ccd979bdSMark Fasheh mlog_entry_void(); 925ccd979bdSMark Fasheh 926ccd979bdSMark Fasheh ocfs2_init_mask_waiter(&mw); 927ccd979bdSMark Fasheh 928b80fc012SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) 929b80fc012SMark Fasheh lkm_flags |= LKM_VALBLK; 930b80fc012SMark Fasheh 931ccd979bdSMark Fasheh again: 932ccd979bdSMark Fasheh wait = 0; 933ccd979bdSMark Fasheh 934ccd979bdSMark Fasheh if (catch_signals && signal_pending(current)) { 935ccd979bdSMark Fasheh ret = -ERESTARTSYS; 936ccd979bdSMark Fasheh goto out; 937ccd979bdSMark Fasheh } 938ccd979bdSMark Fasheh 939ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 940ccd979bdSMark Fasheh 941ccd979bdSMark Fasheh mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, 942ccd979bdSMark Fasheh "Cluster lock called on freeing lockres %s! flags " 943ccd979bdSMark Fasheh "0x%lx\n", lockres->l_name, lockres->l_flags); 944ccd979bdSMark Fasheh 945ccd979bdSMark Fasheh /* We only compare against the currently granted level 946ccd979bdSMark Fasheh * here. If the lock is blocked waiting on a downconvert, 947ccd979bdSMark Fasheh * we'll get caught below. */ 948ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY && 949ccd979bdSMark Fasheh level > lockres->l_level) { 950ccd979bdSMark Fasheh /* is someone sitting in dlm_lock? If so, wait on 951ccd979bdSMark Fasheh * them. */ 952ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); 953ccd979bdSMark Fasheh wait = 1; 954ccd979bdSMark Fasheh goto unlock; 955ccd979bdSMark Fasheh } 956ccd979bdSMark Fasheh 957ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 958ccd979bdSMark Fasheh /* lock has not been created yet. */ 959ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 960ccd979bdSMark Fasheh 961ccd979bdSMark Fasheh ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); 962ccd979bdSMark Fasheh if (ret < 0) { 963ccd979bdSMark Fasheh mlog_errno(ret); 964ccd979bdSMark Fasheh goto out; 965ccd979bdSMark Fasheh } 966ccd979bdSMark Fasheh goto again; 967ccd979bdSMark Fasheh } 968ccd979bdSMark Fasheh 969ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED && 970ccd979bdSMark Fasheh !ocfs2_may_continue_on_blocked_lock(lockres, level)) { 971ccd979bdSMark Fasheh /* is the lock is currently blocked on behalf of 972ccd979bdSMark Fasheh * another node */ 973ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); 974ccd979bdSMark Fasheh wait = 1; 975ccd979bdSMark Fasheh goto unlock; 976ccd979bdSMark Fasheh } 977ccd979bdSMark Fasheh 978ccd979bdSMark Fasheh if (level > lockres->l_level) { 979ccd979bdSMark Fasheh if (lockres->l_action != OCFS2_AST_INVALID) 980ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres %s has action %u pending\n", 981ccd979bdSMark Fasheh lockres->l_name, lockres->l_action); 982ccd979bdSMark Fasheh 983ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_CONVERT; 984ccd979bdSMark Fasheh lockres->l_requested = level; 985ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 986ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 987ccd979bdSMark Fasheh 988ccd979bdSMark Fasheh BUG_ON(level == LKM_IVMODE); 989ccd979bdSMark Fasheh BUG_ON(level == LKM_NLMODE); 990ccd979bdSMark Fasheh 991ccd979bdSMark Fasheh mlog(0, "lock %s, convert from %d to level = %d\n", 992ccd979bdSMark Fasheh lockres->l_name, lockres->l_level, level); 993ccd979bdSMark Fasheh 994ccd979bdSMark Fasheh /* call dlm_lock to upgrade lock now */ 995ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 996ccd979bdSMark Fasheh level, 997ccd979bdSMark Fasheh &lockres->l_lksb, 998b80fc012SMark Fasheh lkm_flags|LKM_CONVERT, 999ccd979bdSMark Fasheh lockres->l_name, 1000f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 1001e92d57dfSMark Fasheh ocfs2_locking_ast, 1002ccd979bdSMark Fasheh lockres, 1003aa2623adSMark Fasheh ocfs2_blocking_ast); 1004ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 1005ccd979bdSMark Fasheh if ((lkm_flags & LKM_NOQUEUE) && 1006ccd979bdSMark Fasheh (status == DLM_NOTQUEUED)) 1007ccd979bdSMark Fasheh ret = -EAGAIN; 1008ccd979bdSMark Fasheh else { 1009ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, 1010ccd979bdSMark Fasheh lockres); 1011ccd979bdSMark Fasheh ret = -EINVAL; 1012ccd979bdSMark Fasheh } 1013ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 1014ccd979bdSMark Fasheh goto out; 1015ccd979bdSMark Fasheh } 1016ccd979bdSMark Fasheh 1017ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmlock\n", 1018ccd979bdSMark Fasheh lockres->l_name); 1019ccd979bdSMark Fasheh 1020ccd979bdSMark Fasheh /* At this point we've gone inside the dlm and need to 1021ccd979bdSMark Fasheh * complete our work regardless. */ 1022ccd979bdSMark Fasheh catch_signals = 0; 1023ccd979bdSMark Fasheh 1024ccd979bdSMark Fasheh /* wait for busy to clear and carry on */ 1025ccd979bdSMark Fasheh goto again; 1026ccd979bdSMark Fasheh } 1027ccd979bdSMark Fasheh 1028ccd979bdSMark Fasheh /* Ok, if we get here then we're good to go. */ 1029ccd979bdSMark Fasheh ocfs2_inc_holders(lockres, level); 1030ccd979bdSMark Fasheh 1031ccd979bdSMark Fasheh ret = 0; 1032ccd979bdSMark Fasheh unlock: 1033ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1034ccd979bdSMark Fasheh out: 1035ccd979bdSMark Fasheh /* 1036ccd979bdSMark Fasheh * This is helping work around a lock inversion between the page lock 1037ccd979bdSMark Fasheh * and dlm locks. One path holds the page lock while calling aops 1038ccd979bdSMark Fasheh * which block acquiring dlm locks. The voting thread holds dlm 1039ccd979bdSMark Fasheh * locks while acquiring page locks while down converting data locks. 1040ccd979bdSMark Fasheh * This block is helping an aop path notice the inversion and back 1041ccd979bdSMark Fasheh * off to unlock its page lock before trying the dlm lock again. 1042ccd979bdSMark Fasheh */ 1043ccd979bdSMark Fasheh if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && 1044ccd979bdSMark Fasheh mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { 1045ccd979bdSMark Fasheh wait = 0; 1046ccd979bdSMark Fasheh if (lockres_remove_mask_waiter(lockres, &mw)) 1047ccd979bdSMark Fasheh ret = -EAGAIN; 1048ccd979bdSMark Fasheh else 1049ccd979bdSMark Fasheh goto again; 1050ccd979bdSMark Fasheh } 1051ccd979bdSMark Fasheh if (wait) { 1052ccd979bdSMark Fasheh ret = ocfs2_wait_for_mask(&mw); 1053ccd979bdSMark Fasheh if (ret == 0) 1054ccd979bdSMark Fasheh goto again; 1055ccd979bdSMark Fasheh mlog_errno(ret); 1056ccd979bdSMark Fasheh } 1057ccd979bdSMark Fasheh 1058ccd979bdSMark Fasheh mlog_exit(ret); 1059ccd979bdSMark Fasheh return ret; 1060ccd979bdSMark Fasheh } 1061ccd979bdSMark Fasheh 1062ccd979bdSMark Fasheh static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 1063ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 1064ccd979bdSMark Fasheh int level) 1065ccd979bdSMark Fasheh { 1066ccd979bdSMark Fasheh unsigned long flags; 1067ccd979bdSMark Fasheh 1068ccd979bdSMark Fasheh mlog_entry_void(); 1069ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1070ccd979bdSMark Fasheh ocfs2_dec_holders(lockres, level); 1071ccd979bdSMark Fasheh ocfs2_vote_on_unlock(osb, lockres); 1072ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1073ccd979bdSMark Fasheh mlog_exit_void(); 1074ccd979bdSMark Fasheh } 1075ccd979bdSMark Fasheh 1076da66116eSAdrian Bunk static int ocfs2_create_new_lock(struct ocfs2_super *osb, 1077d680efe9SMark Fasheh struct ocfs2_lock_res *lockres, 107824c19ef4SMark Fasheh int ex, 107924c19ef4SMark Fasheh int local) 1080ccd979bdSMark Fasheh { 1081d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1082ccd979bdSMark Fasheh unsigned long flags; 108324c19ef4SMark Fasheh int lkm_flags = local ? LKM_LOCAL : 0; 1084ccd979bdSMark Fasheh 1085ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1086ccd979bdSMark Fasheh BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 1087ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); 1088ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1089ccd979bdSMark Fasheh 109024c19ef4SMark Fasheh return ocfs2_lock_create(osb, lockres, level, lkm_flags); 1091ccd979bdSMark Fasheh } 1092ccd979bdSMark Fasheh 1093ccd979bdSMark Fasheh /* Grants us an EX lock on the data and metadata resources, skipping 1094ccd979bdSMark Fasheh * the normal cluster directory lookup. Use this ONLY on newly created 1095ccd979bdSMark Fasheh * inodes which other nodes can't possibly see, and which haven't been 1096ccd979bdSMark Fasheh * hashed in the inode hash yet. This can give us a good performance 1097ccd979bdSMark Fasheh * increase as it'll skip the network broadcast normally associated 1098ccd979bdSMark Fasheh * with creating a new lock resource. */ 1099ccd979bdSMark Fasheh int ocfs2_create_new_inode_locks(struct inode *inode) 1100ccd979bdSMark Fasheh { 1101ccd979bdSMark Fasheh int ret; 1102d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1103ccd979bdSMark Fasheh 1104ccd979bdSMark Fasheh BUG_ON(!inode); 1105ccd979bdSMark Fasheh BUG_ON(!ocfs2_inode_is_new(inode)); 1106ccd979bdSMark Fasheh 1107ccd979bdSMark Fasheh mlog_entry_void(); 1108ccd979bdSMark Fasheh 1109b0697053SMark Fasheh mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); 1110ccd979bdSMark Fasheh 1111ccd979bdSMark Fasheh /* NOTE: That we don't increment any of the holder counts, nor 1112ccd979bdSMark Fasheh * do we add anything to a journal handle. Since this is 1113ccd979bdSMark Fasheh * supposed to be a new inode which the cluster doesn't know 1114ccd979bdSMark Fasheh * about yet, there is no need to. As far as the LVB handling 1115ccd979bdSMark Fasheh * is concerned, this is basically like acquiring an EX lock 1116ccd979bdSMark Fasheh * on a resource which has an invalid one -- we'll set it 1117ccd979bdSMark Fasheh * valid when we release the EX. */ 1118ccd979bdSMark Fasheh 111924c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); 1120ccd979bdSMark Fasheh if (ret) { 1121ccd979bdSMark Fasheh mlog_errno(ret); 1122ccd979bdSMark Fasheh goto bail; 1123ccd979bdSMark Fasheh } 1124ccd979bdSMark Fasheh 112524c19ef4SMark Fasheh /* 112624c19ef4SMark Fasheh * We don't want to use LKM_LOCAL on a meta data lock as they 112724c19ef4SMark Fasheh * don't use a generation in their lock names. 112824c19ef4SMark Fasheh */ 112924c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0); 1130ccd979bdSMark Fasheh if (ret) { 1131ccd979bdSMark Fasheh mlog_errno(ret); 1132ccd979bdSMark Fasheh goto bail; 1133ccd979bdSMark Fasheh } 1134ccd979bdSMark Fasheh 113524c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1); 1136ccd979bdSMark Fasheh if (ret) { 1137ccd979bdSMark Fasheh mlog_errno(ret); 1138ccd979bdSMark Fasheh goto bail; 1139ccd979bdSMark Fasheh } 1140ccd979bdSMark Fasheh 114150008630STiger Yang ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); 114250008630STiger Yang if (ret) { 114350008630STiger Yang mlog_errno(ret); 114450008630STiger Yang goto bail; 114550008630STiger Yang } 114650008630STiger Yang 1147ccd979bdSMark Fasheh bail: 1148ccd979bdSMark Fasheh mlog_exit(ret); 1149ccd979bdSMark Fasheh return ret; 1150ccd979bdSMark Fasheh } 1151ccd979bdSMark Fasheh 1152ccd979bdSMark Fasheh int ocfs2_rw_lock(struct inode *inode, int write) 1153ccd979bdSMark Fasheh { 1154ccd979bdSMark Fasheh int status, level; 1155ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres; 1156c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1157ccd979bdSMark Fasheh 1158ccd979bdSMark Fasheh BUG_ON(!inode); 1159ccd979bdSMark Fasheh 1160ccd979bdSMark Fasheh mlog_entry_void(); 1161ccd979bdSMark Fasheh 1162b0697053SMark Fasheh mlog(0, "inode %llu take %s RW lock\n", 1163b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1164ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1165ccd979bdSMark Fasheh 1166c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1167c271c5c2SSunil Mushran return 0; 1168c271c5c2SSunil Mushran 1169ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_rw_lockres; 1170ccd979bdSMark Fasheh 1171ccd979bdSMark Fasheh level = write ? LKM_EXMODE : LKM_PRMODE; 1172ccd979bdSMark Fasheh 1173ccd979bdSMark Fasheh status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, 1174ccd979bdSMark Fasheh 0); 1175ccd979bdSMark Fasheh if (status < 0) 1176ccd979bdSMark Fasheh mlog_errno(status); 1177ccd979bdSMark Fasheh 1178ccd979bdSMark Fasheh mlog_exit(status); 1179ccd979bdSMark Fasheh return status; 1180ccd979bdSMark Fasheh } 1181ccd979bdSMark Fasheh 1182ccd979bdSMark Fasheh void ocfs2_rw_unlock(struct inode *inode, int write) 1183ccd979bdSMark Fasheh { 1184ccd979bdSMark Fasheh int level = write ? LKM_EXMODE : LKM_PRMODE; 1185ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; 1186c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1187ccd979bdSMark Fasheh 1188ccd979bdSMark Fasheh mlog_entry_void(); 1189ccd979bdSMark Fasheh 1190b0697053SMark Fasheh mlog(0, "inode %llu drop %s RW lock\n", 1191b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1192ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1193ccd979bdSMark Fasheh 1194c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 1195ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1196ccd979bdSMark Fasheh 1197ccd979bdSMark Fasheh mlog_exit_void(); 1198ccd979bdSMark Fasheh } 1199ccd979bdSMark Fasheh 120050008630STiger Yang /* 120150008630STiger Yang * ocfs2_open_lock always get PR mode lock. 120250008630STiger Yang */ 120350008630STiger Yang int ocfs2_open_lock(struct inode *inode) 120450008630STiger Yang { 120550008630STiger Yang int status = 0; 120650008630STiger Yang struct ocfs2_lock_res *lockres; 120750008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 120850008630STiger Yang 120950008630STiger Yang BUG_ON(!inode); 121050008630STiger Yang 121150008630STiger Yang mlog_entry_void(); 121250008630STiger Yang 121350008630STiger Yang mlog(0, "inode %llu take PRMODE open lock\n", 121450008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno); 121550008630STiger Yang 121650008630STiger Yang if (ocfs2_mount_local(osb)) 121750008630STiger Yang goto out; 121850008630STiger Yang 121950008630STiger Yang lockres = &OCFS2_I(inode)->ip_open_lockres; 122050008630STiger Yang 122150008630STiger Yang status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, 122250008630STiger Yang LKM_PRMODE, 0, 0); 122350008630STiger Yang if (status < 0) 122450008630STiger Yang mlog_errno(status); 122550008630STiger Yang 122650008630STiger Yang out: 122750008630STiger Yang mlog_exit(status); 122850008630STiger Yang return status; 122950008630STiger Yang } 123050008630STiger Yang 123150008630STiger Yang int ocfs2_try_open_lock(struct inode *inode, int write) 123250008630STiger Yang { 123350008630STiger Yang int status = 0, level; 123450008630STiger Yang struct ocfs2_lock_res *lockres; 123550008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 123650008630STiger Yang 123750008630STiger Yang BUG_ON(!inode); 123850008630STiger Yang 123950008630STiger Yang mlog_entry_void(); 124050008630STiger Yang 124150008630STiger Yang mlog(0, "inode %llu try to take %s open lock\n", 124250008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno, 124350008630STiger Yang write ? "EXMODE" : "PRMODE"); 124450008630STiger Yang 124550008630STiger Yang if (ocfs2_mount_local(osb)) 124650008630STiger Yang goto out; 124750008630STiger Yang 124850008630STiger Yang lockres = &OCFS2_I(inode)->ip_open_lockres; 124950008630STiger Yang 125050008630STiger Yang level = write ? LKM_EXMODE : LKM_PRMODE; 125150008630STiger Yang 125250008630STiger Yang /* 125350008630STiger Yang * The file system may already holding a PRMODE/EXMODE open lock. 125450008630STiger Yang * Since we pass LKM_NOQUEUE, the request won't block waiting on 125550008630STiger Yang * other nodes and the -EAGAIN will indicate to the caller that 125650008630STiger Yang * this inode is still in use. 125750008630STiger Yang */ 125850008630STiger Yang status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, 125950008630STiger Yang level, LKM_NOQUEUE, 0); 126050008630STiger Yang 126150008630STiger Yang out: 126250008630STiger Yang mlog_exit(status); 126350008630STiger Yang return status; 126450008630STiger Yang } 126550008630STiger Yang 126650008630STiger Yang /* 126750008630STiger Yang * ocfs2_open_unlock unlock PR and EX mode open locks. 126850008630STiger Yang */ 126950008630STiger Yang void ocfs2_open_unlock(struct inode *inode) 127050008630STiger Yang { 127150008630STiger Yang struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; 127250008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 127350008630STiger Yang 127450008630STiger Yang mlog_entry_void(); 127550008630STiger Yang 127650008630STiger Yang mlog(0, "inode %llu drop open lock\n", 127750008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno); 127850008630STiger Yang 127950008630STiger Yang if (ocfs2_mount_local(osb)) 128050008630STiger Yang goto out; 128150008630STiger Yang 128250008630STiger Yang if(lockres->l_ro_holders) 128350008630STiger Yang ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, 128450008630STiger Yang LKM_PRMODE); 128550008630STiger Yang if(lockres->l_ex_holders) 128650008630STiger Yang ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, 128750008630STiger Yang LKM_EXMODE); 128850008630STiger Yang 128950008630STiger Yang out: 129050008630STiger Yang mlog_exit_void(); 129150008630STiger Yang } 129250008630STiger Yang 1293ccd979bdSMark Fasheh int ocfs2_data_lock_full(struct inode *inode, 1294ccd979bdSMark Fasheh int write, 1295ccd979bdSMark Fasheh int arg_flags) 1296ccd979bdSMark Fasheh { 1297ccd979bdSMark Fasheh int status = 0, level; 1298ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres; 1299c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1300ccd979bdSMark Fasheh 1301ccd979bdSMark Fasheh BUG_ON(!inode); 1302ccd979bdSMark Fasheh 1303ccd979bdSMark Fasheh mlog_entry_void(); 1304ccd979bdSMark Fasheh 1305b0697053SMark Fasheh mlog(0, "inode %llu take %s DATA lock\n", 1306b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1307ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1308ccd979bdSMark Fasheh 1309ccd979bdSMark Fasheh /* We'll allow faking a readonly data lock for 1310ccd979bdSMark Fasheh * rodevices. */ 1311ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { 1312ccd979bdSMark Fasheh if (write) { 1313ccd979bdSMark Fasheh status = -EROFS; 1314ccd979bdSMark Fasheh mlog_errno(status); 1315ccd979bdSMark Fasheh } 1316ccd979bdSMark Fasheh goto out; 1317ccd979bdSMark Fasheh } 1318ccd979bdSMark Fasheh 1319c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1320c271c5c2SSunil Mushran goto out; 1321c271c5c2SSunil Mushran 1322ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_data_lockres; 1323ccd979bdSMark Fasheh 1324ccd979bdSMark Fasheh level = write ? LKM_EXMODE : LKM_PRMODE; 1325ccd979bdSMark Fasheh 1326ccd979bdSMark Fasheh status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 1327ccd979bdSMark Fasheh 0, arg_flags); 1328ccd979bdSMark Fasheh if (status < 0 && status != -EAGAIN) 1329ccd979bdSMark Fasheh mlog_errno(status); 1330ccd979bdSMark Fasheh 1331ccd979bdSMark Fasheh out: 1332ccd979bdSMark Fasheh mlog_exit(status); 1333ccd979bdSMark Fasheh return status; 1334ccd979bdSMark Fasheh } 1335ccd979bdSMark Fasheh 1336ccd979bdSMark Fasheh /* see ocfs2_meta_lock_with_page() */ 1337ccd979bdSMark Fasheh int ocfs2_data_lock_with_page(struct inode *inode, 1338ccd979bdSMark Fasheh int write, 1339ccd979bdSMark Fasheh struct page *page) 1340ccd979bdSMark Fasheh { 1341ccd979bdSMark Fasheh int ret; 1342ccd979bdSMark Fasheh 1343ccd979bdSMark Fasheh ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); 1344ccd979bdSMark Fasheh if (ret == -EAGAIN) { 1345ccd979bdSMark Fasheh unlock_page(page); 1346ccd979bdSMark Fasheh if (ocfs2_data_lock(inode, write) == 0) 1347ccd979bdSMark Fasheh ocfs2_data_unlock(inode, write); 1348ccd979bdSMark Fasheh ret = AOP_TRUNCATED_PAGE; 1349ccd979bdSMark Fasheh } 1350ccd979bdSMark Fasheh 1351ccd979bdSMark Fasheh return ret; 1352ccd979bdSMark Fasheh } 1353ccd979bdSMark Fasheh 1354ccd979bdSMark Fasheh static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 1355ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 1356ccd979bdSMark Fasheh { 1357ccd979bdSMark Fasheh int kick = 0; 1358ccd979bdSMark Fasheh 1359ccd979bdSMark Fasheh mlog_entry_void(); 1360ccd979bdSMark Fasheh 1361ccd979bdSMark Fasheh /* If we know that another node is waiting on our lock, kick 1362ccd979bdSMark Fasheh * the vote thread * pre-emptively when we reach a release 1363ccd979bdSMark Fasheh * condition. */ 1364ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { 1365ccd979bdSMark Fasheh switch(lockres->l_blocking) { 1366ccd979bdSMark Fasheh case LKM_EXMODE: 1367ccd979bdSMark Fasheh if (!lockres->l_ex_holders && !lockres->l_ro_holders) 1368ccd979bdSMark Fasheh kick = 1; 1369ccd979bdSMark Fasheh break; 1370ccd979bdSMark Fasheh case LKM_PRMODE: 1371ccd979bdSMark Fasheh if (!lockres->l_ex_holders) 1372ccd979bdSMark Fasheh kick = 1; 1373ccd979bdSMark Fasheh break; 1374ccd979bdSMark Fasheh default: 1375ccd979bdSMark Fasheh BUG(); 1376ccd979bdSMark Fasheh } 1377ccd979bdSMark Fasheh } 1378ccd979bdSMark Fasheh 1379ccd979bdSMark Fasheh if (kick) 1380ccd979bdSMark Fasheh ocfs2_kick_vote_thread(osb); 1381ccd979bdSMark Fasheh 1382ccd979bdSMark Fasheh mlog_exit_void(); 1383ccd979bdSMark Fasheh } 1384ccd979bdSMark Fasheh 1385ccd979bdSMark Fasheh void ocfs2_data_unlock(struct inode *inode, 1386ccd979bdSMark Fasheh int write) 1387ccd979bdSMark Fasheh { 1388ccd979bdSMark Fasheh int level = write ? LKM_EXMODE : LKM_PRMODE; 1389ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; 1390c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1391ccd979bdSMark Fasheh 1392ccd979bdSMark Fasheh mlog_entry_void(); 1393ccd979bdSMark Fasheh 1394b0697053SMark Fasheh mlog(0, "inode %llu drop %s DATA lock\n", 1395b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1396ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1397ccd979bdSMark Fasheh 1398c271c5c2SSunil Mushran if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && 1399c271c5c2SSunil Mushran !ocfs2_mount_local(osb)) 1400ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1401ccd979bdSMark Fasheh 1402ccd979bdSMark Fasheh mlog_exit_void(); 1403ccd979bdSMark Fasheh } 1404ccd979bdSMark Fasheh 1405ccd979bdSMark Fasheh #define OCFS2_SEC_BITS 34 1406ccd979bdSMark Fasheh #define OCFS2_SEC_SHIFT (64 - 34) 1407ccd979bdSMark Fasheh #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) 1408ccd979bdSMark Fasheh 1409ccd979bdSMark Fasheh /* LVB only has room for 64 bits of time here so we pack it for 1410ccd979bdSMark Fasheh * now. */ 1411ccd979bdSMark Fasheh static u64 ocfs2_pack_timespec(struct timespec *spec) 1412ccd979bdSMark Fasheh { 1413ccd979bdSMark Fasheh u64 res; 1414ccd979bdSMark Fasheh u64 sec = spec->tv_sec; 1415ccd979bdSMark Fasheh u32 nsec = spec->tv_nsec; 1416ccd979bdSMark Fasheh 1417ccd979bdSMark Fasheh res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); 1418ccd979bdSMark Fasheh 1419ccd979bdSMark Fasheh return res; 1420ccd979bdSMark Fasheh } 1421ccd979bdSMark Fasheh 1422ccd979bdSMark Fasheh /* Call this with the lockres locked. I am reasonably sure we don't 1423ccd979bdSMark Fasheh * need ip_lock in this function as anyone who would be changing those 1424ccd979bdSMark Fasheh * values is supposed to be blocked in ocfs2_meta_lock right now. */ 1425ccd979bdSMark Fasheh static void __ocfs2_stuff_meta_lvb(struct inode *inode) 1426ccd979bdSMark Fasheh { 1427ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1428ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1429ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb; 1430ccd979bdSMark Fasheh 1431ccd979bdSMark Fasheh mlog_entry_void(); 1432ccd979bdSMark Fasheh 1433ccd979bdSMark Fasheh lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1434ccd979bdSMark Fasheh 143524c19ef4SMark Fasheh /* 143624c19ef4SMark Fasheh * Invalidate the LVB of a deleted inode - this way other 143724c19ef4SMark Fasheh * nodes are forced to go to disk and discover the new inode 143824c19ef4SMark Fasheh * status. 143924c19ef4SMark Fasheh */ 144024c19ef4SMark Fasheh if (oi->ip_flags & OCFS2_INODE_DELETED) { 144124c19ef4SMark Fasheh lvb->lvb_version = 0; 144224c19ef4SMark Fasheh goto out; 144324c19ef4SMark Fasheh } 144424c19ef4SMark Fasheh 14454d3b83f7SMark Fasheh lvb->lvb_version = OCFS2_LVB_VERSION; 1446ccd979bdSMark Fasheh lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); 1447ccd979bdSMark Fasheh lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); 1448ccd979bdSMark Fasheh lvb->lvb_iuid = cpu_to_be32(inode->i_uid); 1449ccd979bdSMark Fasheh lvb->lvb_igid = cpu_to_be32(inode->i_gid); 1450ccd979bdSMark Fasheh lvb->lvb_imode = cpu_to_be16(inode->i_mode); 1451ccd979bdSMark Fasheh lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); 1452ccd979bdSMark Fasheh lvb->lvb_iatime_packed = 1453ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); 1454ccd979bdSMark Fasheh lvb->lvb_ictime_packed = 1455ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); 1456ccd979bdSMark Fasheh lvb->lvb_imtime_packed = 1457ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); 1458ca4d147eSHerbert Poetzl lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); 1459f9e2d82eSMark Fasheh lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); 1460ccd979bdSMark Fasheh 146124c19ef4SMark Fasheh out: 1462ccd979bdSMark Fasheh mlog_meta_lvb(0, lockres); 1463ccd979bdSMark Fasheh 1464ccd979bdSMark Fasheh mlog_exit_void(); 1465ccd979bdSMark Fasheh } 1466ccd979bdSMark Fasheh 1467ccd979bdSMark Fasheh static void ocfs2_unpack_timespec(struct timespec *spec, 1468ccd979bdSMark Fasheh u64 packed_time) 1469ccd979bdSMark Fasheh { 1470ccd979bdSMark Fasheh spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; 1471ccd979bdSMark Fasheh spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; 1472ccd979bdSMark Fasheh } 1473ccd979bdSMark Fasheh 1474ccd979bdSMark Fasheh static void ocfs2_refresh_inode_from_lvb(struct inode *inode) 1475ccd979bdSMark Fasheh { 1476ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1477ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1478ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb; 1479ccd979bdSMark Fasheh 1480ccd979bdSMark Fasheh mlog_entry_void(); 1481ccd979bdSMark Fasheh 1482ccd979bdSMark Fasheh mlog_meta_lvb(0, lockres); 1483ccd979bdSMark Fasheh 1484ccd979bdSMark Fasheh lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1485ccd979bdSMark Fasheh 1486ccd979bdSMark Fasheh /* We're safe here without the lockres lock... */ 1487ccd979bdSMark Fasheh spin_lock(&oi->ip_lock); 1488ccd979bdSMark Fasheh oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); 1489ccd979bdSMark Fasheh i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); 1490ccd979bdSMark Fasheh 1491ca4d147eSHerbert Poetzl oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); 1492ca4d147eSHerbert Poetzl ocfs2_set_inode_flags(inode); 1493ca4d147eSHerbert Poetzl 1494ccd979bdSMark Fasheh /* fast-symlinks are a special case */ 1495ccd979bdSMark Fasheh if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) 1496ccd979bdSMark Fasheh inode->i_blocks = 0; 1497ccd979bdSMark Fasheh else 14988110b073SMark Fasheh inode->i_blocks = ocfs2_inode_sector_count(inode); 1499ccd979bdSMark Fasheh 1500ccd979bdSMark Fasheh inode->i_uid = be32_to_cpu(lvb->lvb_iuid); 1501ccd979bdSMark Fasheh inode->i_gid = be32_to_cpu(lvb->lvb_igid); 1502ccd979bdSMark Fasheh inode->i_mode = be16_to_cpu(lvb->lvb_imode); 1503ccd979bdSMark Fasheh inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); 1504ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_atime, 1505ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_iatime_packed)); 1506ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_mtime, 1507ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_imtime_packed)); 1508ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_ctime, 1509ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_ictime_packed)); 1510ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1511ccd979bdSMark Fasheh 1512ccd979bdSMark Fasheh mlog_exit_void(); 1513ccd979bdSMark Fasheh } 1514ccd979bdSMark Fasheh 1515f9e2d82eSMark Fasheh static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, 1516f9e2d82eSMark Fasheh struct ocfs2_lock_res *lockres) 1517ccd979bdSMark Fasheh { 1518ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1519ccd979bdSMark Fasheh 1520f9e2d82eSMark Fasheh if (lvb->lvb_version == OCFS2_LVB_VERSION 1521f9e2d82eSMark Fasheh && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) 1522ccd979bdSMark Fasheh return 1; 1523ccd979bdSMark Fasheh return 0; 1524ccd979bdSMark Fasheh } 1525ccd979bdSMark Fasheh 1526ccd979bdSMark Fasheh /* Determine whether a lock resource needs to be refreshed, and 1527ccd979bdSMark Fasheh * arbitrate who gets to refresh it. 1528ccd979bdSMark Fasheh * 1529ccd979bdSMark Fasheh * 0 means no refresh needed. 1530ccd979bdSMark Fasheh * 1531ccd979bdSMark Fasheh * > 0 means you need to refresh this and you MUST call 1532ccd979bdSMark Fasheh * ocfs2_complete_lock_res_refresh afterwards. */ 1533ccd979bdSMark Fasheh static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) 1534ccd979bdSMark Fasheh { 1535ccd979bdSMark Fasheh unsigned long flags; 1536ccd979bdSMark Fasheh int status = 0; 1537ccd979bdSMark Fasheh 1538ccd979bdSMark Fasheh mlog_entry_void(); 1539ccd979bdSMark Fasheh 1540ccd979bdSMark Fasheh refresh_check: 1541ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1542ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { 1543ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1544ccd979bdSMark Fasheh goto bail; 1545ccd979bdSMark Fasheh } 1546ccd979bdSMark Fasheh 1547ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { 1548ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1549ccd979bdSMark Fasheh 1550ccd979bdSMark Fasheh ocfs2_wait_on_refreshing_lock(lockres); 1551ccd979bdSMark Fasheh goto refresh_check; 1552ccd979bdSMark Fasheh } 1553ccd979bdSMark Fasheh 1554ccd979bdSMark Fasheh /* Ok, I'll be the one to refresh this lock. */ 1555ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); 1556ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1557ccd979bdSMark Fasheh 1558ccd979bdSMark Fasheh status = 1; 1559ccd979bdSMark Fasheh bail: 1560ccd979bdSMark Fasheh mlog_exit(status); 1561ccd979bdSMark Fasheh return status; 1562ccd979bdSMark Fasheh } 1563ccd979bdSMark Fasheh 1564ccd979bdSMark Fasheh /* If status is non zero, I'll mark it as not being in refresh 1565ccd979bdSMark Fasheh * anymroe, but i won't clear the needs refresh flag. */ 1566ccd979bdSMark Fasheh static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, 1567ccd979bdSMark Fasheh int status) 1568ccd979bdSMark Fasheh { 1569ccd979bdSMark Fasheh unsigned long flags; 1570ccd979bdSMark Fasheh mlog_entry_void(); 1571ccd979bdSMark Fasheh 1572ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1573ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); 1574ccd979bdSMark Fasheh if (!status) 1575ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 1576ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1577ccd979bdSMark Fasheh 1578ccd979bdSMark Fasheh wake_up(&lockres->l_event); 1579ccd979bdSMark Fasheh 1580ccd979bdSMark Fasheh mlog_exit_void(); 1581ccd979bdSMark Fasheh } 1582ccd979bdSMark Fasheh 1583ccd979bdSMark Fasheh /* may or may not return a bh if it went to disk. */ 1584ccd979bdSMark Fasheh static int ocfs2_meta_lock_update(struct inode *inode, 1585ccd979bdSMark Fasheh struct buffer_head **bh) 1586ccd979bdSMark Fasheh { 1587ccd979bdSMark Fasheh int status = 0; 1588ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1589be9e986bSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1590ccd979bdSMark Fasheh struct ocfs2_dinode *fe; 1591c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1592ccd979bdSMark Fasheh 1593ccd979bdSMark Fasheh mlog_entry_void(); 1594ccd979bdSMark Fasheh 1595be9e986bSMark Fasheh if (ocfs2_mount_local(osb)) 1596be9e986bSMark Fasheh goto bail; 1597be9e986bSMark Fasheh 1598ccd979bdSMark Fasheh spin_lock(&oi->ip_lock); 1599ccd979bdSMark Fasheh if (oi->ip_flags & OCFS2_INODE_DELETED) { 1600b0697053SMark Fasheh mlog(0, "Orphaned inode %llu was deleted while we " 1601ccd979bdSMark Fasheh "were waiting on a lock. ip_flags = 0x%x\n", 1602b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, oi->ip_flags); 1603ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1604ccd979bdSMark Fasheh status = -ENOENT; 1605ccd979bdSMark Fasheh goto bail; 1606ccd979bdSMark Fasheh } 1607ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1608ccd979bdSMark Fasheh 1609ccd979bdSMark Fasheh if (!ocfs2_should_refresh_lock_res(lockres)) 1610ccd979bdSMark Fasheh goto bail; 1611ccd979bdSMark Fasheh 1612ccd979bdSMark Fasheh /* This will discard any caching information we might have had 1613ccd979bdSMark Fasheh * for the inode metadata. */ 1614ccd979bdSMark Fasheh ocfs2_metadata_cache_purge(inode); 1615ccd979bdSMark Fasheh 1616be9e986bSMark Fasheh if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { 1617b0697053SMark Fasheh mlog(0, "Trusting LVB on inode %llu\n", 1618b0697053SMark Fasheh (unsigned long long)oi->ip_blkno); 1619ccd979bdSMark Fasheh ocfs2_refresh_inode_from_lvb(inode); 1620ccd979bdSMark Fasheh } else { 1621ccd979bdSMark Fasheh /* Boo, we have to go to disk. */ 1622ccd979bdSMark Fasheh /* read bh, cast, ocfs2_refresh_inode */ 1623ccd979bdSMark Fasheh status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, 1624ccd979bdSMark Fasheh bh, OCFS2_BH_CACHED, inode); 1625ccd979bdSMark Fasheh if (status < 0) { 1626ccd979bdSMark Fasheh mlog_errno(status); 1627ccd979bdSMark Fasheh goto bail_refresh; 1628ccd979bdSMark Fasheh } 1629ccd979bdSMark Fasheh fe = (struct ocfs2_dinode *) (*bh)->b_data; 1630ccd979bdSMark Fasheh 1631ccd979bdSMark Fasheh /* This is a good chance to make sure we're not 1632ccd979bdSMark Fasheh * locking an invalid object. 1633ccd979bdSMark Fasheh * 1634ccd979bdSMark Fasheh * We bug on a stale inode here because we checked 1635ccd979bdSMark Fasheh * above whether it was wiped from disk. The wiping 1636ccd979bdSMark Fasheh * node provides a guarantee that we receive that 1637ccd979bdSMark Fasheh * message and can mark the inode before dropping any 1638ccd979bdSMark Fasheh * locks associated with it. */ 1639ccd979bdSMark Fasheh if (!OCFS2_IS_VALID_DINODE(fe)) { 1640ccd979bdSMark Fasheh OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); 1641ccd979bdSMark Fasheh status = -EIO; 1642ccd979bdSMark Fasheh goto bail_refresh; 1643ccd979bdSMark Fasheh } 1644ccd979bdSMark Fasheh mlog_bug_on_msg(inode->i_generation != 1645ccd979bdSMark Fasheh le32_to_cpu(fe->i_generation), 1646b0697053SMark Fasheh "Invalid dinode %llu disk generation: %u " 1647ccd979bdSMark Fasheh "inode->i_generation: %u\n", 1648b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, 1649b0697053SMark Fasheh le32_to_cpu(fe->i_generation), 1650ccd979bdSMark Fasheh inode->i_generation); 1651ccd979bdSMark Fasheh mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || 1652ccd979bdSMark Fasheh !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), 1653b0697053SMark Fasheh "Stale dinode %llu dtime: %llu flags: 0x%x\n", 1654b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, 1655b0697053SMark Fasheh (unsigned long long)le64_to_cpu(fe->i_dtime), 1656ccd979bdSMark Fasheh le32_to_cpu(fe->i_flags)); 1657ccd979bdSMark Fasheh 1658ccd979bdSMark Fasheh ocfs2_refresh_inode(inode, fe); 1659ccd979bdSMark Fasheh } 1660ccd979bdSMark Fasheh 1661ccd979bdSMark Fasheh status = 0; 1662ccd979bdSMark Fasheh bail_refresh: 1663ccd979bdSMark Fasheh ocfs2_complete_lock_res_refresh(lockres, status); 1664ccd979bdSMark Fasheh bail: 1665ccd979bdSMark Fasheh mlog_exit(status); 1666ccd979bdSMark Fasheh return status; 1667ccd979bdSMark Fasheh } 1668ccd979bdSMark Fasheh 1669ccd979bdSMark Fasheh static int ocfs2_assign_bh(struct inode *inode, 1670ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1671ccd979bdSMark Fasheh struct buffer_head *passed_bh) 1672ccd979bdSMark Fasheh { 1673ccd979bdSMark Fasheh int status; 1674ccd979bdSMark Fasheh 1675ccd979bdSMark Fasheh if (passed_bh) { 1676ccd979bdSMark Fasheh /* Ok, the update went to disk for us, use the 1677ccd979bdSMark Fasheh * returned bh. */ 1678ccd979bdSMark Fasheh *ret_bh = passed_bh; 1679ccd979bdSMark Fasheh get_bh(*ret_bh); 1680ccd979bdSMark Fasheh 1681ccd979bdSMark Fasheh return 0; 1682ccd979bdSMark Fasheh } 1683ccd979bdSMark Fasheh 1684ccd979bdSMark Fasheh status = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1685ccd979bdSMark Fasheh OCFS2_I(inode)->ip_blkno, 1686ccd979bdSMark Fasheh ret_bh, 1687ccd979bdSMark Fasheh OCFS2_BH_CACHED, 1688ccd979bdSMark Fasheh inode); 1689ccd979bdSMark Fasheh if (status < 0) 1690ccd979bdSMark Fasheh mlog_errno(status); 1691ccd979bdSMark Fasheh 1692ccd979bdSMark Fasheh return status; 1693ccd979bdSMark Fasheh } 1694ccd979bdSMark Fasheh 1695ccd979bdSMark Fasheh /* 1696ccd979bdSMark Fasheh * returns < 0 error if the callback will never be called, otherwise 1697ccd979bdSMark Fasheh * the result of the lock will be communicated via the callback. 1698ccd979bdSMark Fasheh */ 1699ccd979bdSMark Fasheh int ocfs2_meta_lock_full(struct inode *inode, 1700ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1701ccd979bdSMark Fasheh int ex, 1702ccd979bdSMark Fasheh int arg_flags) 1703ccd979bdSMark Fasheh { 1704ccd979bdSMark Fasheh int status, level, dlm_flags, acquired; 1705c271c5c2SSunil Mushran struct ocfs2_lock_res *lockres = NULL; 1706ccd979bdSMark Fasheh struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1707ccd979bdSMark Fasheh struct buffer_head *local_bh = NULL; 1708ccd979bdSMark Fasheh 1709ccd979bdSMark Fasheh BUG_ON(!inode); 1710ccd979bdSMark Fasheh 1711ccd979bdSMark Fasheh mlog_entry_void(); 1712ccd979bdSMark Fasheh 1713b0697053SMark Fasheh mlog(0, "inode %llu, take %s META lock\n", 1714b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1715ccd979bdSMark Fasheh ex ? "EXMODE" : "PRMODE"); 1716ccd979bdSMark Fasheh 1717ccd979bdSMark Fasheh status = 0; 1718ccd979bdSMark Fasheh acquired = 0; 1719ccd979bdSMark Fasheh /* We'll allow faking a readonly metadata lock for 1720ccd979bdSMark Fasheh * rodevices. */ 1721ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) { 1722ccd979bdSMark Fasheh if (ex) 1723ccd979bdSMark Fasheh status = -EROFS; 1724ccd979bdSMark Fasheh goto bail; 1725ccd979bdSMark Fasheh } 1726ccd979bdSMark Fasheh 1727c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1728c271c5c2SSunil Mushran goto local; 1729c271c5c2SSunil Mushran 1730ccd979bdSMark Fasheh if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1731ccd979bdSMark Fasheh wait_event(osb->recovery_event, 1732ccd979bdSMark Fasheh ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1733ccd979bdSMark Fasheh 1734ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_meta_lockres; 1735ccd979bdSMark Fasheh level = ex ? LKM_EXMODE : LKM_PRMODE; 1736ccd979bdSMark Fasheh dlm_flags = 0; 1737ccd979bdSMark Fasheh if (arg_flags & OCFS2_META_LOCK_NOQUEUE) 1738ccd979bdSMark Fasheh dlm_flags |= LKM_NOQUEUE; 1739ccd979bdSMark Fasheh 1740ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); 1741ccd979bdSMark Fasheh if (status < 0) { 1742ccd979bdSMark Fasheh if (status != -EAGAIN && status != -EIOCBRETRY) 1743ccd979bdSMark Fasheh mlog_errno(status); 1744ccd979bdSMark Fasheh goto bail; 1745ccd979bdSMark Fasheh } 1746ccd979bdSMark Fasheh 1747ccd979bdSMark Fasheh /* Notify the error cleanup path to drop the cluster lock. */ 1748ccd979bdSMark Fasheh acquired = 1; 1749ccd979bdSMark Fasheh 1750ccd979bdSMark Fasheh /* We wait twice because a node may have died while we were in 1751ccd979bdSMark Fasheh * the lower dlm layers. The second time though, we've 1752ccd979bdSMark Fasheh * committed to owning this lock so we don't allow signals to 1753ccd979bdSMark Fasheh * abort the operation. */ 1754ccd979bdSMark Fasheh if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1755ccd979bdSMark Fasheh wait_event(osb->recovery_event, 1756ccd979bdSMark Fasheh ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1757ccd979bdSMark Fasheh 1758c271c5c2SSunil Mushran local: 175924c19ef4SMark Fasheh /* 176024c19ef4SMark Fasheh * We only see this flag if we're being called from 176124c19ef4SMark Fasheh * ocfs2_read_locked_inode(). It means we're locking an inode 176224c19ef4SMark Fasheh * which hasn't been populated yet, so clear the refresh flag 176324c19ef4SMark Fasheh * and let the caller handle it. 176424c19ef4SMark Fasheh */ 176524c19ef4SMark Fasheh if (inode->i_state & I_NEW) { 176624c19ef4SMark Fasheh status = 0; 1767c271c5c2SSunil Mushran if (lockres) 176824c19ef4SMark Fasheh ocfs2_complete_lock_res_refresh(lockres, 0); 176924c19ef4SMark Fasheh goto bail; 177024c19ef4SMark Fasheh } 177124c19ef4SMark Fasheh 1772ccd979bdSMark Fasheh /* This is fun. The caller may want a bh back, or it may 1773ccd979bdSMark Fasheh * not. ocfs2_meta_lock_update definitely wants one in, but 1774ccd979bdSMark Fasheh * may or may not read one, depending on what's in the 1775ccd979bdSMark Fasheh * LVB. The result of all of this is that we've *only* gone to 1776ccd979bdSMark Fasheh * disk if we have to, so the complexity is worthwhile. */ 1777ccd979bdSMark Fasheh status = ocfs2_meta_lock_update(inode, &local_bh); 1778ccd979bdSMark Fasheh if (status < 0) { 1779ccd979bdSMark Fasheh if (status != -ENOENT) 1780ccd979bdSMark Fasheh mlog_errno(status); 1781ccd979bdSMark Fasheh goto bail; 1782ccd979bdSMark Fasheh } 1783ccd979bdSMark Fasheh 1784ccd979bdSMark Fasheh if (ret_bh) { 1785ccd979bdSMark Fasheh status = ocfs2_assign_bh(inode, ret_bh, local_bh); 1786ccd979bdSMark Fasheh if (status < 0) { 1787ccd979bdSMark Fasheh mlog_errno(status); 1788ccd979bdSMark Fasheh goto bail; 1789ccd979bdSMark Fasheh } 1790ccd979bdSMark Fasheh } 1791ccd979bdSMark Fasheh 1792ccd979bdSMark Fasheh bail: 1793ccd979bdSMark Fasheh if (status < 0) { 1794ccd979bdSMark Fasheh if (ret_bh && (*ret_bh)) { 1795ccd979bdSMark Fasheh brelse(*ret_bh); 1796ccd979bdSMark Fasheh *ret_bh = NULL; 1797ccd979bdSMark Fasheh } 1798ccd979bdSMark Fasheh if (acquired) 1799ccd979bdSMark Fasheh ocfs2_meta_unlock(inode, ex); 1800ccd979bdSMark Fasheh } 1801ccd979bdSMark Fasheh 1802ccd979bdSMark Fasheh if (local_bh) 1803ccd979bdSMark Fasheh brelse(local_bh); 1804ccd979bdSMark Fasheh 1805ccd979bdSMark Fasheh mlog_exit(status); 1806ccd979bdSMark Fasheh return status; 1807ccd979bdSMark Fasheh } 1808ccd979bdSMark Fasheh 1809ccd979bdSMark Fasheh /* 1810ccd979bdSMark Fasheh * This is working around a lock inversion between tasks acquiring DLM locks 1811ccd979bdSMark Fasheh * while holding a page lock and the vote thread which blocks dlm lock acquiry 1812ccd979bdSMark Fasheh * while acquiring page locks. 1813ccd979bdSMark Fasheh * 1814ccd979bdSMark Fasheh * ** These _with_page variantes are only intended to be called from aop 1815ccd979bdSMark Fasheh * methods that hold page locks and return a very specific *positive* error 1816ccd979bdSMark Fasheh * code that aop methods pass up to the VFS -- test for errors with != 0. ** 1817ccd979bdSMark Fasheh * 1818ccd979bdSMark Fasheh * The DLM is called such that it returns -EAGAIN if it would have blocked 1819ccd979bdSMark Fasheh * waiting for the vote thread. In that case we unlock our page so the vote 1820ccd979bdSMark Fasheh * thread can make progress. Once we've done this we have to return 1821ccd979bdSMark Fasheh * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up 1822ccd979bdSMark Fasheh * into the VFS who will then immediately retry the aop call. 1823ccd979bdSMark Fasheh * 1824ccd979bdSMark Fasheh * We do a blocking lock and immediate unlock before returning, though, so that 1825ccd979bdSMark Fasheh * the lock has a great chance of being cached on this node by the time the VFS 1826ccd979bdSMark Fasheh * calls back to retry the aop. This has a potential to livelock as nodes 1827ccd979bdSMark Fasheh * ping locks back and forth, but that's a risk we're willing to take to avoid 1828ccd979bdSMark Fasheh * the lock inversion simply. 1829ccd979bdSMark Fasheh */ 1830ccd979bdSMark Fasheh int ocfs2_meta_lock_with_page(struct inode *inode, 1831ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1832ccd979bdSMark Fasheh int ex, 1833ccd979bdSMark Fasheh struct page *page) 1834ccd979bdSMark Fasheh { 1835ccd979bdSMark Fasheh int ret; 1836ccd979bdSMark Fasheh 18374bcec184SMark Fasheh ret = ocfs2_meta_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); 1838ccd979bdSMark Fasheh if (ret == -EAGAIN) { 1839ccd979bdSMark Fasheh unlock_page(page); 18404bcec184SMark Fasheh if (ocfs2_meta_lock(inode, ret_bh, ex) == 0) 1841ccd979bdSMark Fasheh ocfs2_meta_unlock(inode, ex); 1842ccd979bdSMark Fasheh ret = AOP_TRUNCATED_PAGE; 1843ccd979bdSMark Fasheh } 1844ccd979bdSMark Fasheh 1845ccd979bdSMark Fasheh return ret; 1846ccd979bdSMark Fasheh } 1847ccd979bdSMark Fasheh 18487f1a37e3STiger Yang int ocfs2_meta_lock_atime(struct inode *inode, 18497f1a37e3STiger Yang struct vfsmount *vfsmnt, 18507f1a37e3STiger Yang int *level) 18517f1a37e3STiger Yang { 18527f1a37e3STiger Yang int ret; 18537f1a37e3STiger Yang 18547f1a37e3STiger Yang mlog_entry_void(); 18557f1a37e3STiger Yang ret = ocfs2_meta_lock(inode, NULL, 0); 18567f1a37e3STiger Yang if (ret < 0) { 18577f1a37e3STiger Yang mlog_errno(ret); 18587f1a37e3STiger Yang return ret; 18597f1a37e3STiger Yang } 18607f1a37e3STiger Yang 18617f1a37e3STiger Yang /* 18627f1a37e3STiger Yang * If we should update atime, we will get EX lock, 18637f1a37e3STiger Yang * otherwise we just get PR lock. 18647f1a37e3STiger Yang */ 18657f1a37e3STiger Yang if (ocfs2_should_update_atime(inode, vfsmnt)) { 18667f1a37e3STiger Yang struct buffer_head *bh = NULL; 18677f1a37e3STiger Yang 18687f1a37e3STiger Yang ocfs2_meta_unlock(inode, 0); 18697f1a37e3STiger Yang ret = ocfs2_meta_lock(inode, &bh, 1); 18707f1a37e3STiger Yang if (ret < 0) { 18717f1a37e3STiger Yang mlog_errno(ret); 18727f1a37e3STiger Yang return ret; 18737f1a37e3STiger Yang } 18747f1a37e3STiger Yang *level = 1; 18757f1a37e3STiger Yang if (ocfs2_should_update_atime(inode, vfsmnt)) 18767f1a37e3STiger Yang ocfs2_update_inode_atime(inode, bh); 18777f1a37e3STiger Yang if (bh) 18787f1a37e3STiger Yang brelse(bh); 18797f1a37e3STiger Yang } else 18807f1a37e3STiger Yang *level = 0; 18817f1a37e3STiger Yang 18827f1a37e3STiger Yang mlog_exit(ret); 18837f1a37e3STiger Yang return ret; 18847f1a37e3STiger Yang } 18857f1a37e3STiger Yang 1886ccd979bdSMark Fasheh void ocfs2_meta_unlock(struct inode *inode, 1887ccd979bdSMark Fasheh int ex) 1888ccd979bdSMark Fasheh { 1889ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1890ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; 1891c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1892ccd979bdSMark Fasheh 1893ccd979bdSMark Fasheh mlog_entry_void(); 1894ccd979bdSMark Fasheh 1895b0697053SMark Fasheh mlog(0, "inode %llu drop %s META lock\n", 1896b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1897ccd979bdSMark Fasheh ex ? "EXMODE" : "PRMODE"); 1898ccd979bdSMark Fasheh 1899c271c5c2SSunil Mushran if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && 1900c271c5c2SSunil Mushran !ocfs2_mount_local(osb)) 1901ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1902ccd979bdSMark Fasheh 1903ccd979bdSMark Fasheh mlog_exit_void(); 1904ccd979bdSMark Fasheh } 1905ccd979bdSMark Fasheh 1906ccd979bdSMark Fasheh int ocfs2_super_lock(struct ocfs2_super *osb, 1907ccd979bdSMark Fasheh int ex) 1908ccd979bdSMark Fasheh { 1909c271c5c2SSunil Mushran int status = 0; 1910ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1911ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1912ccd979bdSMark Fasheh struct buffer_head *bh; 1913ccd979bdSMark Fasheh struct ocfs2_slot_info *si = osb->slot_info; 1914ccd979bdSMark Fasheh 1915ccd979bdSMark Fasheh mlog_entry_void(); 1916ccd979bdSMark Fasheh 1917ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) 1918ccd979bdSMark Fasheh return -EROFS; 1919ccd979bdSMark Fasheh 1920c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1921c271c5c2SSunil Mushran goto bail; 1922c271c5c2SSunil Mushran 1923ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); 1924ccd979bdSMark Fasheh if (status < 0) { 1925ccd979bdSMark Fasheh mlog_errno(status); 1926ccd979bdSMark Fasheh goto bail; 1927ccd979bdSMark Fasheh } 1928ccd979bdSMark Fasheh 1929ccd979bdSMark Fasheh /* The super block lock path is really in the best position to 1930ccd979bdSMark Fasheh * know when resources covered by the lock need to be 1931ccd979bdSMark Fasheh * refreshed, so we do it here. Of course, making sense of 1932ccd979bdSMark Fasheh * everything is up to the caller :) */ 1933ccd979bdSMark Fasheh status = ocfs2_should_refresh_lock_res(lockres); 1934ccd979bdSMark Fasheh if (status < 0) { 1935ccd979bdSMark Fasheh mlog_errno(status); 1936ccd979bdSMark Fasheh goto bail; 1937ccd979bdSMark Fasheh } 1938ccd979bdSMark Fasheh if (status) { 1939ccd979bdSMark Fasheh bh = si->si_bh; 1940ccd979bdSMark Fasheh status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, 1941ccd979bdSMark Fasheh si->si_inode); 1942ccd979bdSMark Fasheh if (status == 0) 1943ccd979bdSMark Fasheh ocfs2_update_slot_info(si); 1944ccd979bdSMark Fasheh 1945ccd979bdSMark Fasheh ocfs2_complete_lock_res_refresh(lockres, status); 1946ccd979bdSMark Fasheh 1947ccd979bdSMark Fasheh if (status < 0) 1948ccd979bdSMark Fasheh mlog_errno(status); 1949ccd979bdSMark Fasheh } 1950ccd979bdSMark Fasheh bail: 1951ccd979bdSMark Fasheh mlog_exit(status); 1952ccd979bdSMark Fasheh return status; 1953ccd979bdSMark Fasheh } 1954ccd979bdSMark Fasheh 1955ccd979bdSMark Fasheh void ocfs2_super_unlock(struct ocfs2_super *osb, 1956ccd979bdSMark Fasheh int ex) 1957ccd979bdSMark Fasheh { 1958ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1959ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1960ccd979bdSMark Fasheh 1961c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 1962ccd979bdSMark Fasheh ocfs2_cluster_unlock(osb, lockres, level); 1963ccd979bdSMark Fasheh } 1964ccd979bdSMark Fasheh 1965ccd979bdSMark Fasheh int ocfs2_rename_lock(struct ocfs2_super *osb) 1966ccd979bdSMark Fasheh { 1967ccd979bdSMark Fasheh int status; 1968ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 1969ccd979bdSMark Fasheh 1970ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) 1971ccd979bdSMark Fasheh return -EROFS; 1972ccd979bdSMark Fasheh 1973c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1974c271c5c2SSunil Mushran return 0; 1975c271c5c2SSunil Mushran 1976ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); 1977ccd979bdSMark Fasheh if (status < 0) 1978ccd979bdSMark Fasheh mlog_errno(status); 1979ccd979bdSMark Fasheh 1980ccd979bdSMark Fasheh return status; 1981ccd979bdSMark Fasheh } 1982ccd979bdSMark Fasheh 1983ccd979bdSMark Fasheh void ocfs2_rename_unlock(struct ocfs2_super *osb) 1984ccd979bdSMark Fasheh { 1985ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 1986ccd979bdSMark Fasheh 1987c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 1988ccd979bdSMark Fasheh ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); 1989ccd979bdSMark Fasheh } 1990ccd979bdSMark Fasheh 1991d680efe9SMark Fasheh int ocfs2_dentry_lock(struct dentry *dentry, int ex) 1992d680efe9SMark Fasheh { 1993d680efe9SMark Fasheh int ret; 1994d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1995d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 1996d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 1997d680efe9SMark Fasheh 1998d680efe9SMark Fasheh BUG_ON(!dl); 1999d680efe9SMark Fasheh 2000d680efe9SMark Fasheh if (ocfs2_is_hard_readonly(osb)) 2001d680efe9SMark Fasheh return -EROFS; 2002d680efe9SMark Fasheh 2003c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 2004c271c5c2SSunil Mushran return 0; 2005c271c5c2SSunil Mushran 2006d680efe9SMark Fasheh ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); 2007d680efe9SMark Fasheh if (ret < 0) 2008d680efe9SMark Fasheh mlog_errno(ret); 2009d680efe9SMark Fasheh 2010d680efe9SMark Fasheh return ret; 2011d680efe9SMark Fasheh } 2012d680efe9SMark Fasheh 2013d680efe9SMark Fasheh void ocfs2_dentry_unlock(struct dentry *dentry, int ex) 2014d680efe9SMark Fasheh { 2015d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 2016d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 2017d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 2018d680efe9SMark Fasheh 2019c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 2020d680efe9SMark Fasheh ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); 2021d680efe9SMark Fasheh } 2022d680efe9SMark Fasheh 2023ccd979bdSMark Fasheh /* Reference counting of the dlm debug structure. We want this because 2024ccd979bdSMark Fasheh * open references on the debug inodes can live on after a mount, so 2025ccd979bdSMark Fasheh * we can't rely on the ocfs2_super to always exist. */ 2026ccd979bdSMark Fasheh static void ocfs2_dlm_debug_free(struct kref *kref) 2027ccd979bdSMark Fasheh { 2028ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug; 2029ccd979bdSMark Fasheh 2030ccd979bdSMark Fasheh dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); 2031ccd979bdSMark Fasheh 2032ccd979bdSMark Fasheh kfree(dlm_debug); 2033ccd979bdSMark Fasheh } 2034ccd979bdSMark Fasheh 2035ccd979bdSMark Fasheh void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) 2036ccd979bdSMark Fasheh { 2037ccd979bdSMark Fasheh if (dlm_debug) 2038ccd979bdSMark Fasheh kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); 2039ccd979bdSMark Fasheh } 2040ccd979bdSMark Fasheh 2041ccd979bdSMark Fasheh static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) 2042ccd979bdSMark Fasheh { 2043ccd979bdSMark Fasheh kref_get(&debug->d_refcnt); 2044ccd979bdSMark Fasheh } 2045ccd979bdSMark Fasheh 2046ccd979bdSMark Fasheh struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) 2047ccd979bdSMark Fasheh { 2048ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug; 2049ccd979bdSMark Fasheh 2050ccd979bdSMark Fasheh dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); 2051ccd979bdSMark Fasheh if (!dlm_debug) { 2052ccd979bdSMark Fasheh mlog_errno(-ENOMEM); 2053ccd979bdSMark Fasheh goto out; 2054ccd979bdSMark Fasheh } 2055ccd979bdSMark Fasheh 2056ccd979bdSMark Fasheh kref_init(&dlm_debug->d_refcnt); 2057ccd979bdSMark Fasheh INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); 2058ccd979bdSMark Fasheh dlm_debug->d_locking_state = NULL; 2059ccd979bdSMark Fasheh out: 2060ccd979bdSMark Fasheh return dlm_debug; 2061ccd979bdSMark Fasheh } 2062ccd979bdSMark Fasheh 2063ccd979bdSMark Fasheh /* Access to this is arbitrated for us via seq_file->sem. */ 2064ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv { 2065ccd979bdSMark Fasheh struct ocfs2_dlm_debug *p_dlm_debug; 2066ccd979bdSMark Fasheh struct ocfs2_lock_res p_iter_res; 2067ccd979bdSMark Fasheh struct ocfs2_lock_res p_tmp_res; 2068ccd979bdSMark Fasheh }; 2069ccd979bdSMark Fasheh 2070ccd979bdSMark Fasheh static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, 2071ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv) 2072ccd979bdSMark Fasheh { 2073ccd979bdSMark Fasheh struct ocfs2_lock_res *iter, *ret = NULL; 2074ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; 2075ccd979bdSMark Fasheh 2076ccd979bdSMark Fasheh assert_spin_locked(&ocfs2_dlm_tracking_lock); 2077ccd979bdSMark Fasheh 2078ccd979bdSMark Fasheh list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { 2079ccd979bdSMark Fasheh /* discover the head of the list */ 2080ccd979bdSMark Fasheh if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { 2081ccd979bdSMark Fasheh mlog(0, "End of list found, %p\n", ret); 2082ccd979bdSMark Fasheh break; 2083ccd979bdSMark Fasheh } 2084ccd979bdSMark Fasheh 2085ccd979bdSMark Fasheh /* We track our "dummy" iteration lockres' by a NULL 2086ccd979bdSMark Fasheh * l_ops field. */ 2087ccd979bdSMark Fasheh if (iter->l_ops != NULL) { 2088ccd979bdSMark Fasheh ret = iter; 2089ccd979bdSMark Fasheh break; 2090ccd979bdSMark Fasheh } 2091ccd979bdSMark Fasheh } 2092ccd979bdSMark Fasheh 2093ccd979bdSMark Fasheh return ret; 2094ccd979bdSMark Fasheh } 2095ccd979bdSMark Fasheh 2096ccd979bdSMark Fasheh static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) 2097ccd979bdSMark Fasheh { 2098ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = m->private; 2099ccd979bdSMark Fasheh struct ocfs2_lock_res *iter; 2100ccd979bdSMark Fasheh 2101ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 2102ccd979bdSMark Fasheh iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); 2103ccd979bdSMark Fasheh if (iter) { 2104ccd979bdSMark Fasheh /* Since lockres' have the lifetime of their container 2105ccd979bdSMark Fasheh * (which can be inodes, ocfs2_supers, etc) we want to 2106ccd979bdSMark Fasheh * copy this out to a temporary lockres while still 2107ccd979bdSMark Fasheh * under the spinlock. Obviously after this we can't 2108ccd979bdSMark Fasheh * trust any pointers on the copy returned, but that's 2109ccd979bdSMark Fasheh * ok as the information we want isn't typically held 2110ccd979bdSMark Fasheh * in them. */ 2111ccd979bdSMark Fasheh priv->p_tmp_res = *iter; 2112ccd979bdSMark Fasheh iter = &priv->p_tmp_res; 2113ccd979bdSMark Fasheh } 2114ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 2115ccd979bdSMark Fasheh 2116ccd979bdSMark Fasheh return iter; 2117ccd979bdSMark Fasheh } 2118ccd979bdSMark Fasheh 2119ccd979bdSMark Fasheh static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) 2120ccd979bdSMark Fasheh { 2121ccd979bdSMark Fasheh } 2122ccd979bdSMark Fasheh 2123ccd979bdSMark Fasheh static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) 2124ccd979bdSMark Fasheh { 2125ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = m->private; 2126ccd979bdSMark Fasheh struct ocfs2_lock_res *iter = v; 2127ccd979bdSMark Fasheh struct ocfs2_lock_res *dummy = &priv->p_iter_res; 2128ccd979bdSMark Fasheh 2129ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 2130ccd979bdSMark Fasheh iter = ocfs2_dlm_next_res(iter, priv); 2131ccd979bdSMark Fasheh list_del_init(&dummy->l_debug_list); 2132ccd979bdSMark Fasheh if (iter) { 2133ccd979bdSMark Fasheh list_add(&dummy->l_debug_list, &iter->l_debug_list); 2134ccd979bdSMark Fasheh priv->p_tmp_res = *iter; 2135ccd979bdSMark Fasheh iter = &priv->p_tmp_res; 2136ccd979bdSMark Fasheh } 2137ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 2138ccd979bdSMark Fasheh 2139ccd979bdSMark Fasheh return iter; 2140ccd979bdSMark Fasheh } 2141ccd979bdSMark Fasheh 2142ccd979bdSMark Fasheh /* So that debugfs.ocfs2 can determine which format is being used */ 2143ccd979bdSMark Fasheh #define OCFS2_DLM_DEBUG_STR_VERSION 1 2144ccd979bdSMark Fasheh static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) 2145ccd979bdSMark Fasheh { 2146ccd979bdSMark Fasheh int i; 2147ccd979bdSMark Fasheh char *lvb; 2148ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = v; 2149ccd979bdSMark Fasheh 2150ccd979bdSMark Fasheh if (!lockres) 2151ccd979bdSMark Fasheh return -EINVAL; 2152ccd979bdSMark Fasheh 2153d680efe9SMark Fasheh seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); 2154d680efe9SMark Fasheh 2155d680efe9SMark Fasheh if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) 2156d680efe9SMark Fasheh seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, 2157d680efe9SMark Fasheh lockres->l_name, 2158d680efe9SMark Fasheh (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); 2159d680efe9SMark Fasheh else 2160d680efe9SMark Fasheh seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); 2161d680efe9SMark Fasheh 2162d680efe9SMark Fasheh seq_printf(m, "%d\t" 2163ccd979bdSMark Fasheh "0x%lx\t" 2164ccd979bdSMark Fasheh "0x%x\t" 2165ccd979bdSMark Fasheh "0x%x\t" 2166ccd979bdSMark Fasheh "%u\t" 2167ccd979bdSMark Fasheh "%u\t" 2168ccd979bdSMark Fasheh "%d\t" 2169ccd979bdSMark Fasheh "%d\t", 2170ccd979bdSMark Fasheh lockres->l_level, 2171ccd979bdSMark Fasheh lockres->l_flags, 2172ccd979bdSMark Fasheh lockres->l_action, 2173ccd979bdSMark Fasheh lockres->l_unlock_action, 2174ccd979bdSMark Fasheh lockres->l_ro_holders, 2175ccd979bdSMark Fasheh lockres->l_ex_holders, 2176ccd979bdSMark Fasheh lockres->l_requested, 2177ccd979bdSMark Fasheh lockres->l_blocking); 2178ccd979bdSMark Fasheh 2179ccd979bdSMark Fasheh /* Dump the raw LVB */ 2180ccd979bdSMark Fasheh lvb = lockres->l_lksb.lvb; 2181ccd979bdSMark Fasheh for(i = 0; i < DLM_LVB_LEN; i++) 2182ccd979bdSMark Fasheh seq_printf(m, "0x%x\t", lvb[i]); 2183ccd979bdSMark Fasheh 2184ccd979bdSMark Fasheh /* End the line */ 2185ccd979bdSMark Fasheh seq_printf(m, "\n"); 2186ccd979bdSMark Fasheh return 0; 2187ccd979bdSMark Fasheh } 2188ccd979bdSMark Fasheh 2189ccd979bdSMark Fasheh static struct seq_operations ocfs2_dlm_seq_ops = { 2190ccd979bdSMark Fasheh .start = ocfs2_dlm_seq_start, 2191ccd979bdSMark Fasheh .stop = ocfs2_dlm_seq_stop, 2192ccd979bdSMark Fasheh .next = ocfs2_dlm_seq_next, 2193ccd979bdSMark Fasheh .show = ocfs2_dlm_seq_show, 2194ccd979bdSMark Fasheh }; 2195ccd979bdSMark Fasheh 2196ccd979bdSMark Fasheh static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) 2197ccd979bdSMark Fasheh { 2198ccd979bdSMark Fasheh struct seq_file *seq = (struct seq_file *) file->private_data; 2199ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = seq->private; 2200ccd979bdSMark Fasheh struct ocfs2_lock_res *res = &priv->p_iter_res; 2201ccd979bdSMark Fasheh 2202ccd979bdSMark Fasheh ocfs2_remove_lockres_tracking(res); 2203ccd979bdSMark Fasheh ocfs2_put_dlm_debug(priv->p_dlm_debug); 2204ccd979bdSMark Fasheh return seq_release_private(inode, file); 2205ccd979bdSMark Fasheh } 2206ccd979bdSMark Fasheh 2207ccd979bdSMark Fasheh static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) 2208ccd979bdSMark Fasheh { 2209ccd979bdSMark Fasheh int ret; 2210ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv; 2211ccd979bdSMark Fasheh struct seq_file *seq; 2212ccd979bdSMark Fasheh struct ocfs2_super *osb; 2213ccd979bdSMark Fasheh 2214ccd979bdSMark Fasheh priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); 2215ccd979bdSMark Fasheh if (!priv) { 2216ccd979bdSMark Fasheh ret = -ENOMEM; 2217ccd979bdSMark Fasheh mlog_errno(ret); 2218ccd979bdSMark Fasheh goto out; 2219ccd979bdSMark Fasheh } 22208e18e294STheodore Ts'o osb = inode->i_private; 2221ccd979bdSMark Fasheh ocfs2_get_dlm_debug(osb->osb_dlm_debug); 2222ccd979bdSMark Fasheh priv->p_dlm_debug = osb->osb_dlm_debug; 2223ccd979bdSMark Fasheh INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); 2224ccd979bdSMark Fasheh 2225ccd979bdSMark Fasheh ret = seq_open(file, &ocfs2_dlm_seq_ops); 2226ccd979bdSMark Fasheh if (ret) { 2227ccd979bdSMark Fasheh kfree(priv); 2228ccd979bdSMark Fasheh mlog_errno(ret); 2229ccd979bdSMark Fasheh goto out; 2230ccd979bdSMark Fasheh } 2231ccd979bdSMark Fasheh 2232ccd979bdSMark Fasheh seq = (struct seq_file *) file->private_data; 2233ccd979bdSMark Fasheh seq->private = priv; 2234ccd979bdSMark Fasheh 2235ccd979bdSMark Fasheh ocfs2_add_lockres_tracking(&priv->p_iter_res, 2236ccd979bdSMark Fasheh priv->p_dlm_debug); 2237ccd979bdSMark Fasheh 2238ccd979bdSMark Fasheh out: 2239ccd979bdSMark Fasheh return ret; 2240ccd979bdSMark Fasheh } 2241ccd979bdSMark Fasheh 22424b6f5d20SArjan van de Ven static const struct file_operations ocfs2_dlm_debug_fops = { 2243ccd979bdSMark Fasheh .open = ocfs2_dlm_debug_open, 2244ccd979bdSMark Fasheh .release = ocfs2_dlm_debug_release, 2245ccd979bdSMark Fasheh .read = seq_read, 2246ccd979bdSMark Fasheh .llseek = seq_lseek, 2247ccd979bdSMark Fasheh }; 2248ccd979bdSMark Fasheh 2249ccd979bdSMark Fasheh static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) 2250ccd979bdSMark Fasheh { 2251ccd979bdSMark Fasheh int ret = 0; 2252ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2253ccd979bdSMark Fasheh 2254ccd979bdSMark Fasheh dlm_debug->d_locking_state = debugfs_create_file("locking_state", 2255ccd979bdSMark Fasheh S_IFREG|S_IRUSR, 2256ccd979bdSMark Fasheh osb->osb_debug_root, 2257ccd979bdSMark Fasheh osb, 2258ccd979bdSMark Fasheh &ocfs2_dlm_debug_fops); 2259ccd979bdSMark Fasheh if (!dlm_debug->d_locking_state) { 2260ccd979bdSMark Fasheh ret = -EINVAL; 2261ccd979bdSMark Fasheh mlog(ML_ERROR, 2262ccd979bdSMark Fasheh "Unable to create locking state debugfs file.\n"); 2263ccd979bdSMark Fasheh goto out; 2264ccd979bdSMark Fasheh } 2265ccd979bdSMark Fasheh 2266ccd979bdSMark Fasheh ocfs2_get_dlm_debug(dlm_debug); 2267ccd979bdSMark Fasheh out: 2268ccd979bdSMark Fasheh return ret; 2269ccd979bdSMark Fasheh } 2270ccd979bdSMark Fasheh 2271ccd979bdSMark Fasheh static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) 2272ccd979bdSMark Fasheh { 2273ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2274ccd979bdSMark Fasheh 2275ccd979bdSMark Fasheh if (dlm_debug) { 2276ccd979bdSMark Fasheh debugfs_remove(dlm_debug->d_locking_state); 2277ccd979bdSMark Fasheh ocfs2_put_dlm_debug(dlm_debug); 2278ccd979bdSMark Fasheh } 2279ccd979bdSMark Fasheh } 2280ccd979bdSMark Fasheh 2281ccd979bdSMark Fasheh int ocfs2_dlm_init(struct ocfs2_super *osb) 2282ccd979bdSMark Fasheh { 2283c271c5c2SSunil Mushran int status = 0; 2284ccd979bdSMark Fasheh u32 dlm_key; 2285c271c5c2SSunil Mushran struct dlm_ctxt *dlm = NULL; 2286ccd979bdSMark Fasheh 2287ccd979bdSMark Fasheh mlog_entry_void(); 2288ccd979bdSMark Fasheh 2289c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 2290c271c5c2SSunil Mushran goto local; 2291c271c5c2SSunil Mushran 2292ccd979bdSMark Fasheh status = ocfs2_dlm_init_debug(osb); 2293ccd979bdSMark Fasheh if (status < 0) { 2294ccd979bdSMark Fasheh mlog_errno(status); 2295ccd979bdSMark Fasheh goto bail; 2296ccd979bdSMark Fasheh } 2297ccd979bdSMark Fasheh 2298ccd979bdSMark Fasheh /* launch vote thread */ 229978427043SMark Fasheh osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); 2300ccd979bdSMark Fasheh if (IS_ERR(osb->vote_task)) { 2301ccd979bdSMark Fasheh status = PTR_ERR(osb->vote_task); 2302ccd979bdSMark Fasheh osb->vote_task = NULL; 2303ccd979bdSMark Fasheh mlog_errno(status); 2304ccd979bdSMark Fasheh goto bail; 2305ccd979bdSMark Fasheh } 2306ccd979bdSMark Fasheh 2307ccd979bdSMark Fasheh /* used by the dlm code to make message headers unique, each 2308ccd979bdSMark Fasheh * node in this domain must agree on this. */ 2309ccd979bdSMark Fasheh dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); 2310ccd979bdSMark Fasheh 2311ccd979bdSMark Fasheh /* for now, uuid == domain */ 2312ccd979bdSMark Fasheh dlm = dlm_register_domain(osb->uuid_str, dlm_key); 2313ccd979bdSMark Fasheh if (IS_ERR(dlm)) { 2314ccd979bdSMark Fasheh status = PTR_ERR(dlm); 2315ccd979bdSMark Fasheh mlog_errno(status); 2316ccd979bdSMark Fasheh goto bail; 2317ccd979bdSMark Fasheh } 2318ccd979bdSMark Fasheh 2319c271c5c2SSunil Mushran dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); 2320c271c5c2SSunil Mushran 2321c271c5c2SSunil Mushran local: 2322ccd979bdSMark Fasheh ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); 2323ccd979bdSMark Fasheh ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); 2324ccd979bdSMark Fasheh 2325ccd979bdSMark Fasheh osb->dlm = dlm; 2326ccd979bdSMark Fasheh 2327ccd979bdSMark Fasheh status = 0; 2328ccd979bdSMark Fasheh bail: 2329ccd979bdSMark Fasheh if (status < 0) { 2330ccd979bdSMark Fasheh ocfs2_dlm_shutdown_debug(osb); 2331ccd979bdSMark Fasheh if (osb->vote_task) 2332ccd979bdSMark Fasheh kthread_stop(osb->vote_task); 2333ccd979bdSMark Fasheh } 2334ccd979bdSMark Fasheh 2335ccd979bdSMark Fasheh mlog_exit(status); 2336ccd979bdSMark Fasheh return status; 2337ccd979bdSMark Fasheh } 2338ccd979bdSMark Fasheh 2339ccd979bdSMark Fasheh void ocfs2_dlm_shutdown(struct ocfs2_super *osb) 2340ccd979bdSMark Fasheh { 2341ccd979bdSMark Fasheh mlog_entry_void(); 2342ccd979bdSMark Fasheh 2343ccd979bdSMark Fasheh dlm_unregister_eviction_cb(&osb->osb_eviction_cb); 2344ccd979bdSMark Fasheh 2345ccd979bdSMark Fasheh ocfs2_drop_osb_locks(osb); 2346ccd979bdSMark Fasheh 2347ccd979bdSMark Fasheh if (osb->vote_task) { 2348ccd979bdSMark Fasheh kthread_stop(osb->vote_task); 2349ccd979bdSMark Fasheh osb->vote_task = NULL; 2350ccd979bdSMark Fasheh } 2351ccd979bdSMark Fasheh 2352ccd979bdSMark Fasheh ocfs2_lock_res_free(&osb->osb_super_lockres); 2353ccd979bdSMark Fasheh ocfs2_lock_res_free(&osb->osb_rename_lockres); 2354ccd979bdSMark Fasheh 2355ccd979bdSMark Fasheh dlm_unregister_domain(osb->dlm); 2356ccd979bdSMark Fasheh osb->dlm = NULL; 2357ccd979bdSMark Fasheh 2358ccd979bdSMark Fasheh ocfs2_dlm_shutdown_debug(osb); 2359ccd979bdSMark Fasheh 2360ccd979bdSMark Fasheh mlog_exit_void(); 2361ccd979bdSMark Fasheh } 2362ccd979bdSMark Fasheh 23632a45f2d1SMark Fasheh static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) 2364ccd979bdSMark Fasheh { 2365ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 2366ccd979bdSMark Fasheh unsigned long flags; 2367ccd979bdSMark Fasheh 2368ccd979bdSMark Fasheh mlog_entry_void(); 2369ccd979bdSMark Fasheh 2370ccd979bdSMark Fasheh mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, 2371ccd979bdSMark Fasheh lockres->l_unlock_action); 2372ccd979bdSMark Fasheh 2373ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2374ccd979bdSMark Fasheh /* We tried to cancel a convert request, but it was already 2375ccd979bdSMark Fasheh * granted. All we want to do here is clear our unlock 2376ccd979bdSMark Fasheh * state. The wake_up call done at the bottom is redundant 2377ccd979bdSMark Fasheh * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't 2378ccd979bdSMark Fasheh * hurt anything anyway */ 2379ccd979bdSMark Fasheh if (status == DLM_CANCELGRANT && 2380ccd979bdSMark Fasheh lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2381ccd979bdSMark Fasheh mlog(0, "Got cancelgrant for %s\n", lockres->l_name); 2382ccd979bdSMark Fasheh 2383ccd979bdSMark Fasheh /* We don't clear the busy flag in this case as it 2384ccd979bdSMark Fasheh * should have been cleared by the ast which the dlm 2385ccd979bdSMark Fasheh * has called. */ 2386ccd979bdSMark Fasheh goto complete_unlock; 2387ccd979bdSMark Fasheh } 2388ccd979bdSMark Fasheh 2389ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2390ccd979bdSMark Fasheh mlog(ML_ERROR, "Dlm passes status %d for lock %s, " 2391ccd979bdSMark Fasheh "unlock_action %d\n", status, lockres->l_name, 2392ccd979bdSMark Fasheh lockres->l_unlock_action); 2393ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2394ccd979bdSMark Fasheh return; 2395ccd979bdSMark Fasheh } 2396ccd979bdSMark Fasheh 2397ccd979bdSMark Fasheh switch(lockres->l_unlock_action) { 2398ccd979bdSMark Fasheh case OCFS2_UNLOCK_CANCEL_CONVERT: 2399ccd979bdSMark Fasheh mlog(0, "Cancel convert success for %s\n", lockres->l_name); 2400ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 2401ccd979bdSMark Fasheh break; 2402ccd979bdSMark Fasheh case OCFS2_UNLOCK_DROP_LOCK: 2403ccd979bdSMark Fasheh lockres->l_level = LKM_IVMODE; 2404ccd979bdSMark Fasheh break; 2405ccd979bdSMark Fasheh default: 2406ccd979bdSMark Fasheh BUG(); 2407ccd979bdSMark Fasheh } 2408ccd979bdSMark Fasheh 2409ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 2410ccd979bdSMark Fasheh complete_unlock: 2411ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 2412ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2413ccd979bdSMark Fasheh 2414ccd979bdSMark Fasheh wake_up(&lockres->l_event); 2415ccd979bdSMark Fasheh 2416ccd979bdSMark Fasheh mlog_exit_void(); 2417ccd979bdSMark Fasheh } 2418ccd979bdSMark Fasheh 2419ccd979bdSMark Fasheh static int ocfs2_drop_lock(struct ocfs2_super *osb, 24200d5dc6c2SMark Fasheh struct ocfs2_lock_res *lockres) 2421ccd979bdSMark Fasheh { 2422ccd979bdSMark Fasheh enum dlm_status status; 2423ccd979bdSMark Fasheh unsigned long flags; 2424b80fc012SMark Fasheh int lkm_flags = 0; 2425ccd979bdSMark Fasheh 2426ccd979bdSMark Fasheh /* We didn't get anywhere near actually using this lockres. */ 2427ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) 2428ccd979bdSMark Fasheh goto out; 2429ccd979bdSMark Fasheh 2430b80fc012SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) 2431b80fc012SMark Fasheh lkm_flags |= LKM_VALBLK; 2432b80fc012SMark Fasheh 2433ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2434ccd979bdSMark Fasheh 2435ccd979bdSMark Fasheh mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), 2436ccd979bdSMark Fasheh "lockres %s, flags 0x%lx\n", 2437ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 2438ccd979bdSMark Fasheh 2439ccd979bdSMark Fasheh while (lockres->l_flags & OCFS2_LOCK_BUSY) { 2440ccd979bdSMark Fasheh mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " 2441ccd979bdSMark Fasheh "%u, unlock_action = %u\n", 2442ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags, lockres->l_action, 2443ccd979bdSMark Fasheh lockres->l_unlock_action); 2444ccd979bdSMark Fasheh 2445ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2446ccd979bdSMark Fasheh 2447ccd979bdSMark Fasheh /* XXX: Today we just wait on any busy 2448ccd979bdSMark Fasheh * locks... Perhaps we need to cancel converts in the 2449ccd979bdSMark Fasheh * future? */ 2450ccd979bdSMark Fasheh ocfs2_wait_on_busy_lock(lockres); 2451ccd979bdSMark Fasheh 2452ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2453ccd979bdSMark Fasheh } 2454ccd979bdSMark Fasheh 24550d5dc6c2SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { 24560d5dc6c2SMark Fasheh if (lockres->l_flags & OCFS2_LOCK_ATTACHED && 24570d5dc6c2SMark Fasheh lockres->l_level == LKM_EXMODE && 24580d5dc6c2SMark Fasheh !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) 24590d5dc6c2SMark Fasheh lockres->l_ops->set_lvb(lockres); 24600d5dc6c2SMark Fasheh } 2461ccd979bdSMark Fasheh 2462ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY) 2463ccd979bdSMark Fasheh mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", 2464ccd979bdSMark Fasheh lockres->l_name); 2465ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED) 2466ccd979bdSMark Fasheh mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); 2467ccd979bdSMark Fasheh 2468ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 2469ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2470ccd979bdSMark Fasheh goto out; 2471ccd979bdSMark Fasheh } 2472ccd979bdSMark Fasheh 2473ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); 2474ccd979bdSMark Fasheh 2475ccd979bdSMark Fasheh /* make sure we never get here while waiting for an ast to 2476ccd979bdSMark Fasheh * fire. */ 2477ccd979bdSMark Fasheh BUG_ON(lockres->l_action != OCFS2_AST_INVALID); 2478ccd979bdSMark Fasheh 2479ccd979bdSMark Fasheh /* is this necessary? */ 2480ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2481ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; 2482ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2483ccd979bdSMark Fasheh 2484ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2485ccd979bdSMark Fasheh 2486b80fc012SMark Fasheh status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, 24872a45f2d1SMark Fasheh ocfs2_unlock_ast, lockres); 2488ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2489ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmunlock", status, lockres); 2490ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); 2491ccd979bdSMark Fasheh dlm_print_one_lock(lockres->l_lksb.lockid); 2492ccd979bdSMark Fasheh BUG(); 2493ccd979bdSMark Fasheh } 2494ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmunlock\n", 2495ccd979bdSMark Fasheh lockres->l_name); 2496ccd979bdSMark Fasheh 2497ccd979bdSMark Fasheh ocfs2_wait_on_busy_lock(lockres); 2498ccd979bdSMark Fasheh out: 2499ccd979bdSMark Fasheh mlog_exit(0); 2500ccd979bdSMark Fasheh return 0; 2501ccd979bdSMark Fasheh } 2502ccd979bdSMark Fasheh 2503ccd979bdSMark Fasheh /* Mark the lockres as being dropped. It will no longer be 2504ccd979bdSMark Fasheh * queued if blocking, but we still may have to wait on it 2505ccd979bdSMark Fasheh * being dequeued from the vote thread before we can consider 2506ccd979bdSMark Fasheh * it safe to drop. 2507ccd979bdSMark Fasheh * 2508ccd979bdSMark Fasheh * You can *not* attempt to call cluster_lock on this lockres anymore. */ 2509ccd979bdSMark Fasheh void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) 2510ccd979bdSMark Fasheh { 2511ccd979bdSMark Fasheh int status; 2512ccd979bdSMark Fasheh struct ocfs2_mask_waiter mw; 2513ccd979bdSMark Fasheh unsigned long flags; 2514ccd979bdSMark Fasheh 2515ccd979bdSMark Fasheh ocfs2_init_mask_waiter(&mw); 2516ccd979bdSMark Fasheh 2517ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2518ccd979bdSMark Fasheh lockres->l_flags |= OCFS2_LOCK_FREEING; 2519ccd979bdSMark Fasheh while (lockres->l_flags & OCFS2_LOCK_QUEUED) { 2520ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); 2521ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2522ccd979bdSMark Fasheh 2523ccd979bdSMark Fasheh mlog(0, "Waiting on lockres %s\n", lockres->l_name); 2524ccd979bdSMark Fasheh 2525ccd979bdSMark Fasheh status = ocfs2_wait_for_mask(&mw); 2526ccd979bdSMark Fasheh if (status) 2527ccd979bdSMark Fasheh mlog_errno(status); 2528ccd979bdSMark Fasheh 2529ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2530ccd979bdSMark Fasheh } 2531ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2532ccd979bdSMark Fasheh } 2533ccd979bdSMark Fasheh 2534d680efe9SMark Fasheh void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, 2535d680efe9SMark Fasheh struct ocfs2_lock_res *lockres) 2536d680efe9SMark Fasheh { 2537d680efe9SMark Fasheh int ret; 2538d680efe9SMark Fasheh 2539d680efe9SMark Fasheh ocfs2_mark_lockres_freeing(lockres); 25400d5dc6c2SMark Fasheh ret = ocfs2_drop_lock(osb, lockres); 2541d680efe9SMark Fasheh if (ret) 2542d680efe9SMark Fasheh mlog_errno(ret); 2543d680efe9SMark Fasheh } 2544d680efe9SMark Fasheh 2545ccd979bdSMark Fasheh static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) 2546ccd979bdSMark Fasheh { 2547d680efe9SMark Fasheh ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); 2548d680efe9SMark Fasheh ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); 2549ccd979bdSMark Fasheh } 2550ccd979bdSMark Fasheh 2551ccd979bdSMark Fasheh int ocfs2_drop_inode_locks(struct inode *inode) 2552ccd979bdSMark Fasheh { 2553ccd979bdSMark Fasheh int status, err; 2554ccd979bdSMark Fasheh 2555ccd979bdSMark Fasheh mlog_entry_void(); 2556ccd979bdSMark Fasheh 2557ccd979bdSMark Fasheh /* No need to call ocfs2_mark_lockres_freeing here - 2558ccd979bdSMark Fasheh * ocfs2_clear_inode has done it for us. */ 2559ccd979bdSMark Fasheh 2560ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 256150008630STiger Yang &OCFS2_I(inode)->ip_open_lockres); 2562ccd979bdSMark Fasheh if (err < 0) 2563ccd979bdSMark Fasheh mlog_errno(err); 2564ccd979bdSMark Fasheh 2565ccd979bdSMark Fasheh status = err; 2566ccd979bdSMark Fasheh 2567ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 256850008630STiger Yang &OCFS2_I(inode)->ip_data_lockres); 256950008630STiger Yang if (err < 0) 257050008630STiger Yang mlog_errno(err); 257150008630STiger Yang if (err < 0 && !status) 257250008630STiger Yang status = err; 257350008630STiger Yang 257450008630STiger Yang err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 25750d5dc6c2SMark Fasheh &OCFS2_I(inode)->ip_meta_lockres); 2576ccd979bdSMark Fasheh if (err < 0) 2577ccd979bdSMark Fasheh mlog_errno(err); 2578ccd979bdSMark Fasheh if (err < 0 && !status) 2579ccd979bdSMark Fasheh status = err; 2580ccd979bdSMark Fasheh 2581ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 25820d5dc6c2SMark Fasheh &OCFS2_I(inode)->ip_rw_lockres); 2583ccd979bdSMark Fasheh if (err < 0) 2584ccd979bdSMark Fasheh mlog_errno(err); 2585ccd979bdSMark Fasheh if (err < 0 && !status) 2586ccd979bdSMark Fasheh status = err; 2587ccd979bdSMark Fasheh 2588ccd979bdSMark Fasheh mlog_exit(status); 2589ccd979bdSMark Fasheh return status; 2590ccd979bdSMark Fasheh } 2591ccd979bdSMark Fasheh 2592ccd979bdSMark Fasheh static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, 2593ccd979bdSMark Fasheh int new_level) 2594ccd979bdSMark Fasheh { 2595ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 2596ccd979bdSMark Fasheh 2597ccd979bdSMark Fasheh BUG_ON(lockres->l_blocking <= LKM_NLMODE); 2598ccd979bdSMark Fasheh 2599ccd979bdSMark Fasheh if (lockres->l_level <= new_level) { 2600ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", 2601ccd979bdSMark Fasheh lockres->l_level, new_level); 2602ccd979bdSMark Fasheh BUG(); 2603ccd979bdSMark Fasheh } 2604ccd979bdSMark Fasheh 2605ccd979bdSMark Fasheh mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", 2606ccd979bdSMark Fasheh lockres->l_name, new_level, lockres->l_blocking); 2607ccd979bdSMark Fasheh 2608ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_DOWNCONVERT; 2609ccd979bdSMark Fasheh lockres->l_requested = new_level; 2610ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2611ccd979bdSMark Fasheh } 2612ccd979bdSMark Fasheh 2613ccd979bdSMark Fasheh static int ocfs2_downconvert_lock(struct ocfs2_super *osb, 2614ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 2615ccd979bdSMark Fasheh int new_level, 2616ccd979bdSMark Fasheh int lvb) 2617ccd979bdSMark Fasheh { 2618ccd979bdSMark Fasheh int ret, dlm_flags = LKM_CONVERT; 2619ccd979bdSMark Fasheh enum dlm_status status; 2620ccd979bdSMark Fasheh 2621ccd979bdSMark Fasheh mlog_entry_void(); 2622ccd979bdSMark Fasheh 2623ccd979bdSMark Fasheh if (lvb) 2624ccd979bdSMark Fasheh dlm_flags |= LKM_VALBLK; 2625ccd979bdSMark Fasheh 2626ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 2627ccd979bdSMark Fasheh new_level, 2628ccd979bdSMark Fasheh &lockres->l_lksb, 2629ccd979bdSMark Fasheh dlm_flags, 2630ccd979bdSMark Fasheh lockres->l_name, 2631f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 2632e92d57dfSMark Fasheh ocfs2_locking_ast, 2633ccd979bdSMark Fasheh lockres, 2634aa2623adSMark Fasheh ocfs2_blocking_ast); 2635ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2636ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, lockres); 2637ccd979bdSMark Fasheh ret = -EINVAL; 2638ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 2639ccd979bdSMark Fasheh goto bail; 2640ccd979bdSMark Fasheh } 2641ccd979bdSMark Fasheh 2642ccd979bdSMark Fasheh ret = 0; 2643ccd979bdSMark Fasheh bail: 2644ccd979bdSMark Fasheh mlog_exit(ret); 2645ccd979bdSMark Fasheh return ret; 2646ccd979bdSMark Fasheh } 2647ccd979bdSMark Fasheh 2648ccd979bdSMark Fasheh /* returns 1 when the caller should unlock and call dlmunlock */ 2649ccd979bdSMark Fasheh static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, 2650ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 2651ccd979bdSMark Fasheh { 2652ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 2653ccd979bdSMark Fasheh 2654ccd979bdSMark Fasheh mlog_entry_void(); 2655ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2656ccd979bdSMark Fasheh 2657ccd979bdSMark Fasheh if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2658ccd979bdSMark Fasheh /* If we're already trying to cancel a lock conversion 2659ccd979bdSMark Fasheh * then just drop the spinlock and allow the caller to 2660ccd979bdSMark Fasheh * requeue this lock. */ 2661ccd979bdSMark Fasheh 2662ccd979bdSMark Fasheh mlog(0, "Lockres %s, skip convert\n", lockres->l_name); 2663ccd979bdSMark Fasheh return 0; 2664ccd979bdSMark Fasheh } 2665ccd979bdSMark Fasheh 2666ccd979bdSMark Fasheh /* were we in a convert when we got the bast fire? */ 2667ccd979bdSMark Fasheh BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && 2668ccd979bdSMark Fasheh lockres->l_action != OCFS2_AST_DOWNCONVERT); 2669ccd979bdSMark Fasheh /* set things up for the unlockast to know to just 2670ccd979bdSMark Fasheh * clear out the ast_action and unset busy, etc. */ 2671ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; 2672ccd979bdSMark Fasheh 2673ccd979bdSMark Fasheh mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), 2674ccd979bdSMark Fasheh "lock %s, invalid flags: 0x%lx\n", 2675ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 2676ccd979bdSMark Fasheh 2677ccd979bdSMark Fasheh return 1; 2678ccd979bdSMark Fasheh } 2679ccd979bdSMark Fasheh 2680ccd979bdSMark Fasheh static int ocfs2_cancel_convert(struct ocfs2_super *osb, 2681ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 2682ccd979bdSMark Fasheh { 2683ccd979bdSMark Fasheh int ret; 2684ccd979bdSMark Fasheh enum dlm_status status; 2685ccd979bdSMark Fasheh 2686ccd979bdSMark Fasheh mlog_entry_void(); 2687ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2688ccd979bdSMark Fasheh 2689ccd979bdSMark Fasheh ret = 0; 2690ccd979bdSMark Fasheh status = dlmunlock(osb->dlm, 2691ccd979bdSMark Fasheh &lockres->l_lksb, 2692ccd979bdSMark Fasheh LKM_CANCEL, 26932a45f2d1SMark Fasheh ocfs2_unlock_ast, 2694ccd979bdSMark Fasheh lockres); 2695ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2696ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmunlock", status, lockres); 2697ccd979bdSMark Fasheh ret = -EINVAL; 2698ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 0); 2699ccd979bdSMark Fasheh } 2700ccd979bdSMark Fasheh 2701ccd979bdSMark Fasheh mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); 2702ccd979bdSMark Fasheh 2703ccd979bdSMark Fasheh mlog_exit(ret); 2704ccd979bdSMark Fasheh return ret; 2705ccd979bdSMark Fasheh } 2706ccd979bdSMark Fasheh 2707b5e500e2SMark Fasheh static int ocfs2_unblock_lock(struct ocfs2_super *osb, 2708ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 2709cc567d89SMark Fasheh struct ocfs2_unblock_ctl *ctl) 2710ccd979bdSMark Fasheh { 2711ccd979bdSMark Fasheh unsigned long flags; 2712ccd979bdSMark Fasheh int blocking; 2713ccd979bdSMark Fasheh int new_level; 2714ccd979bdSMark Fasheh int ret = 0; 27155ef0d4eaSMark Fasheh int set_lvb = 0; 2716ccd979bdSMark Fasheh 2717ccd979bdSMark Fasheh mlog_entry_void(); 2718ccd979bdSMark Fasheh 2719ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2720ccd979bdSMark Fasheh 2721ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 2722ccd979bdSMark Fasheh 2723ccd979bdSMark Fasheh recheck: 2724ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY) { 2725d680efe9SMark Fasheh ctl->requeue = 1; 2726ccd979bdSMark Fasheh ret = ocfs2_prepare_cancel_convert(osb, lockres); 2727ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2728ccd979bdSMark Fasheh if (ret) { 2729ccd979bdSMark Fasheh ret = ocfs2_cancel_convert(osb, lockres); 2730ccd979bdSMark Fasheh if (ret < 0) 2731ccd979bdSMark Fasheh mlog_errno(ret); 2732ccd979bdSMark Fasheh } 2733ccd979bdSMark Fasheh goto leave; 2734ccd979bdSMark Fasheh } 2735ccd979bdSMark Fasheh 2736ccd979bdSMark Fasheh /* if we're blocking an exclusive and we have *any* holders, 2737ccd979bdSMark Fasheh * then requeue. */ 2738ccd979bdSMark Fasheh if ((lockres->l_blocking == LKM_EXMODE) 2739f7fbfdd1SMark Fasheh && (lockres->l_ex_holders || lockres->l_ro_holders)) 2740f7fbfdd1SMark Fasheh goto leave_requeue; 2741ccd979bdSMark Fasheh 2742ccd979bdSMark Fasheh /* If it's a PR we're blocking, then only 2743ccd979bdSMark Fasheh * requeue if we've got any EX holders */ 2744ccd979bdSMark Fasheh if (lockres->l_blocking == LKM_PRMODE && 2745f7fbfdd1SMark Fasheh lockres->l_ex_holders) 2746f7fbfdd1SMark Fasheh goto leave_requeue; 2747f7fbfdd1SMark Fasheh 2748f7fbfdd1SMark Fasheh /* 2749f7fbfdd1SMark Fasheh * Can we get a lock in this state if the holder counts are 2750f7fbfdd1SMark Fasheh * zero? The meta data unblock code used to check this. 2751f7fbfdd1SMark Fasheh */ 2752f7fbfdd1SMark Fasheh if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 2753f7fbfdd1SMark Fasheh && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) 2754f7fbfdd1SMark Fasheh goto leave_requeue; 2755ccd979bdSMark Fasheh 275616d5b956SMark Fasheh new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); 275716d5b956SMark Fasheh 275816d5b956SMark Fasheh if (lockres->l_ops->check_downconvert 275916d5b956SMark Fasheh && !lockres->l_ops->check_downconvert(lockres, new_level)) 276016d5b956SMark Fasheh goto leave_requeue; 276116d5b956SMark Fasheh 2762ccd979bdSMark Fasheh /* If we get here, then we know that there are no more 2763ccd979bdSMark Fasheh * incompatible holders (and anyone asking for an incompatible 2764ccd979bdSMark Fasheh * lock is blocked). We can now downconvert the lock */ 2765cc567d89SMark Fasheh if (!lockres->l_ops->downconvert_worker) 2766ccd979bdSMark Fasheh goto downconvert; 2767ccd979bdSMark Fasheh 2768ccd979bdSMark Fasheh /* Some lockres types want to do a bit of work before 2769ccd979bdSMark Fasheh * downconverting a lock. Allow that here. The worker function 2770ccd979bdSMark Fasheh * may sleep, so we save off a copy of what we're blocking as 2771ccd979bdSMark Fasheh * it may change while we're not holding the spin lock. */ 2772ccd979bdSMark Fasheh blocking = lockres->l_blocking; 2773ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2774ccd979bdSMark Fasheh 2775cc567d89SMark Fasheh ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); 2776d680efe9SMark Fasheh 2777d680efe9SMark Fasheh if (ctl->unblock_action == UNBLOCK_STOP_POST) 2778d680efe9SMark Fasheh goto leave; 2779ccd979bdSMark Fasheh 2780ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2781ccd979bdSMark Fasheh if (blocking != lockres->l_blocking) { 2782ccd979bdSMark Fasheh /* If this changed underneath us, then we can't drop 2783ccd979bdSMark Fasheh * it just yet. */ 2784ccd979bdSMark Fasheh goto recheck; 2785ccd979bdSMark Fasheh } 2786ccd979bdSMark Fasheh 2787ccd979bdSMark Fasheh downconvert: 2788d680efe9SMark Fasheh ctl->requeue = 0; 2789ccd979bdSMark Fasheh 27905ef0d4eaSMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { 27915ef0d4eaSMark Fasheh if (lockres->l_level == LKM_EXMODE) 27925ef0d4eaSMark Fasheh set_lvb = 1; 27935ef0d4eaSMark Fasheh 27945ef0d4eaSMark Fasheh /* 27955ef0d4eaSMark Fasheh * We only set the lvb if the lock has been fully 27965ef0d4eaSMark Fasheh * refreshed - otherwise we risk setting stale 27975ef0d4eaSMark Fasheh * data. Otherwise, there's no need to actually clear 27985ef0d4eaSMark Fasheh * out the lvb here as it's value is still valid. 27995ef0d4eaSMark Fasheh */ 28005ef0d4eaSMark Fasheh if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) 28015ef0d4eaSMark Fasheh lockres->l_ops->set_lvb(lockres); 28025ef0d4eaSMark Fasheh } 28035ef0d4eaSMark Fasheh 2804ccd979bdSMark Fasheh ocfs2_prepare_downconvert(lockres, new_level); 2805ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 28065ef0d4eaSMark Fasheh ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); 2807ccd979bdSMark Fasheh leave: 2808ccd979bdSMark Fasheh mlog_exit(ret); 2809ccd979bdSMark Fasheh return ret; 2810f7fbfdd1SMark Fasheh 2811f7fbfdd1SMark Fasheh leave_requeue: 2812f7fbfdd1SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2813f7fbfdd1SMark Fasheh ctl->requeue = 1; 2814f7fbfdd1SMark Fasheh 2815f7fbfdd1SMark Fasheh mlog_exit(0); 2816f7fbfdd1SMark Fasheh return 0; 2817ccd979bdSMark Fasheh } 2818ccd979bdSMark Fasheh 2819d680efe9SMark Fasheh static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, 2820ccd979bdSMark Fasheh int blocking) 2821ccd979bdSMark Fasheh { 2822ccd979bdSMark Fasheh struct inode *inode; 2823ccd979bdSMark Fasheh struct address_space *mapping; 2824ccd979bdSMark Fasheh 2825ccd979bdSMark Fasheh inode = ocfs2_lock_res_inode(lockres); 2826ccd979bdSMark Fasheh mapping = inode->i_mapping; 2827ccd979bdSMark Fasheh 28287f4a2a97SMark Fasheh /* 28297f4a2a97SMark Fasheh * We need this before the filemap_fdatawrite() so that it can 28307f4a2a97SMark Fasheh * transfer the dirty bit from the PTE to the 28317f4a2a97SMark Fasheh * page. Unfortunately this means that even for EX->PR 28327f4a2a97SMark Fasheh * downconverts, we'll lose our mappings and have to build 28337f4a2a97SMark Fasheh * them up again. 28347f4a2a97SMark Fasheh */ 28357f4a2a97SMark Fasheh unmap_mapping_range(mapping, 0, 0, 0); 28367f4a2a97SMark Fasheh 2837ccd979bdSMark Fasheh if (filemap_fdatawrite(mapping)) { 2838b0697053SMark Fasheh mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", 2839b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno); 2840ccd979bdSMark Fasheh } 2841ccd979bdSMark Fasheh sync_mapping_buffers(mapping); 2842ccd979bdSMark Fasheh if (blocking == LKM_EXMODE) { 2843ccd979bdSMark Fasheh truncate_inode_pages(mapping, 0); 2844ccd979bdSMark Fasheh } else { 2845ccd979bdSMark Fasheh /* We only need to wait on the I/O if we're not also 2846ccd979bdSMark Fasheh * truncating pages because truncate_inode_pages waits 2847ccd979bdSMark Fasheh * for us above. We don't truncate pages if we're 2848ccd979bdSMark Fasheh * blocking anything < EXMODE because we want to keep 2849ccd979bdSMark Fasheh * them around in that case. */ 2850ccd979bdSMark Fasheh filemap_fdatawait(mapping); 2851ccd979bdSMark Fasheh } 2852ccd979bdSMark Fasheh 2853d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2854ccd979bdSMark Fasheh } 2855ccd979bdSMark Fasheh 2856810d5aebSMark Fasheh static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, 2857810d5aebSMark Fasheh int new_level) 2858810d5aebSMark Fasheh { 2859810d5aebSMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 2860810d5aebSMark Fasheh int checkpointed = ocfs2_inode_fully_checkpointed(inode); 2861810d5aebSMark Fasheh 2862810d5aebSMark Fasheh BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); 2863810d5aebSMark Fasheh BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed); 2864810d5aebSMark Fasheh 2865810d5aebSMark Fasheh if (checkpointed) 2866810d5aebSMark Fasheh return 1; 2867810d5aebSMark Fasheh 2868810d5aebSMark Fasheh ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); 2869810d5aebSMark Fasheh return 0; 2870810d5aebSMark Fasheh } 2871810d5aebSMark Fasheh 2872810d5aebSMark Fasheh static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) 2873810d5aebSMark Fasheh { 2874810d5aebSMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 2875810d5aebSMark Fasheh 2876810d5aebSMark Fasheh __ocfs2_stuff_meta_lvb(inode); 2877810d5aebSMark Fasheh } 2878810d5aebSMark Fasheh 2879d680efe9SMark Fasheh /* 2880d680efe9SMark Fasheh * Does the final reference drop on our dentry lock. Right now this 2881d680efe9SMark Fasheh * happens in the vote thread, but we could choose to simplify the 2882d680efe9SMark Fasheh * dlmglue API and push these off to the ocfs2_wq in the future. 2883d680efe9SMark Fasheh */ 2884d680efe9SMark Fasheh static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 2885d680efe9SMark Fasheh struct ocfs2_lock_res *lockres) 2886d680efe9SMark Fasheh { 2887d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2888d680efe9SMark Fasheh ocfs2_dentry_lock_put(osb, dl); 2889d680efe9SMark Fasheh } 2890d680efe9SMark Fasheh 2891d680efe9SMark Fasheh /* 2892d680efe9SMark Fasheh * d_delete() matching dentries before the lock downconvert. 2893d680efe9SMark Fasheh * 2894d680efe9SMark Fasheh * At this point, any process waiting to destroy the 2895d680efe9SMark Fasheh * dentry_lock due to last ref count is stopped by the 2896d680efe9SMark Fasheh * OCFS2_LOCK_QUEUED flag. 2897d680efe9SMark Fasheh * 2898d680efe9SMark Fasheh * We have two potential problems 2899d680efe9SMark Fasheh * 2900d680efe9SMark Fasheh * 1) If we do the last reference drop on our dentry_lock (via dput) 2901d680efe9SMark Fasheh * we'll wind up in ocfs2_release_dentry_lock(), waiting on 2902d680efe9SMark Fasheh * the downconvert to finish. Instead we take an elevated 2903d680efe9SMark Fasheh * reference and push the drop until after we've completed our 2904d680efe9SMark Fasheh * unblock processing. 2905d680efe9SMark Fasheh * 2906d680efe9SMark Fasheh * 2) There might be another process with a final reference, 2907d680efe9SMark Fasheh * waiting on us to finish processing. If this is the case, we 2908d680efe9SMark Fasheh * detect it and exit out - there's no more dentries anyway. 2909d680efe9SMark Fasheh */ 2910d680efe9SMark Fasheh static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, 2911d680efe9SMark Fasheh int blocking) 2912d680efe9SMark Fasheh { 2913d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2914d680efe9SMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); 2915d680efe9SMark Fasheh struct dentry *dentry; 2916d680efe9SMark Fasheh unsigned long flags; 2917d680efe9SMark Fasheh int extra_ref = 0; 2918d680efe9SMark Fasheh 2919d680efe9SMark Fasheh /* 2920d680efe9SMark Fasheh * This node is blocking another node from getting a read 2921d680efe9SMark Fasheh * lock. This happens when we've renamed within a 2922d680efe9SMark Fasheh * directory. We've forced the other nodes to d_delete(), but 2923d680efe9SMark Fasheh * we never actually dropped our lock because it's still 2924d680efe9SMark Fasheh * valid. The downconvert code will retain a PR for this node, 2925d680efe9SMark Fasheh * so there's no further work to do. 2926d680efe9SMark Fasheh */ 2927d680efe9SMark Fasheh if (blocking == LKM_PRMODE) 2928d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2929d680efe9SMark Fasheh 2930d680efe9SMark Fasheh /* 2931d680efe9SMark Fasheh * Mark this inode as potentially orphaned. The code in 2932d680efe9SMark Fasheh * ocfs2_delete_inode() will figure out whether it actually 2933d680efe9SMark Fasheh * needs to be freed or not. 2934d680efe9SMark Fasheh */ 2935d680efe9SMark Fasheh spin_lock(&oi->ip_lock); 2936d680efe9SMark Fasheh oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; 2937d680efe9SMark Fasheh spin_unlock(&oi->ip_lock); 2938d680efe9SMark Fasheh 2939d680efe9SMark Fasheh /* 2940d680efe9SMark Fasheh * Yuck. We need to make sure however that the check of 2941d680efe9SMark Fasheh * OCFS2_LOCK_FREEING and the extra reference are atomic with 2942d680efe9SMark Fasheh * respect to a reference decrement or the setting of that 2943d680efe9SMark Fasheh * flag. 2944d680efe9SMark Fasheh */ 2945d680efe9SMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2946d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 2947d680efe9SMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_FREEING) 2948d680efe9SMark Fasheh && dl->dl_count) { 2949d680efe9SMark Fasheh dl->dl_count++; 2950d680efe9SMark Fasheh extra_ref = 1; 2951d680efe9SMark Fasheh } 2952d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 2953d680efe9SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2954d680efe9SMark Fasheh 2955d680efe9SMark Fasheh mlog(0, "extra_ref = %d\n", extra_ref); 2956d680efe9SMark Fasheh 2957d680efe9SMark Fasheh /* 2958d680efe9SMark Fasheh * We have a process waiting on us in ocfs2_dentry_iput(), 2959d680efe9SMark Fasheh * which means we can't have any more outstanding 2960d680efe9SMark Fasheh * aliases. There's no need to do any more work. 2961d680efe9SMark Fasheh */ 2962d680efe9SMark Fasheh if (!extra_ref) 2963d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2964d680efe9SMark Fasheh 2965d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 2966d680efe9SMark Fasheh while (1) { 2967d680efe9SMark Fasheh dentry = ocfs2_find_local_alias(dl->dl_inode, 2968d680efe9SMark Fasheh dl->dl_parent_blkno, 1); 2969d680efe9SMark Fasheh if (!dentry) 2970d680efe9SMark Fasheh break; 2971d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 2972d680efe9SMark Fasheh 2973d680efe9SMark Fasheh mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, 2974d680efe9SMark Fasheh dentry->d_name.name); 2975d680efe9SMark Fasheh 2976d680efe9SMark Fasheh /* 2977d680efe9SMark Fasheh * The following dcache calls may do an 2978d680efe9SMark Fasheh * iput(). Normally we don't want that from the 2979d680efe9SMark Fasheh * downconverting thread, but in this case it's ok 2980d680efe9SMark Fasheh * because the requesting node already has an 2981d680efe9SMark Fasheh * exclusive lock on the inode, so it can't be queued 2982d680efe9SMark Fasheh * for a downconvert. 2983d680efe9SMark Fasheh */ 2984d680efe9SMark Fasheh d_delete(dentry); 2985d680efe9SMark Fasheh dput(dentry); 2986d680efe9SMark Fasheh 2987d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 2988d680efe9SMark Fasheh } 2989d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 2990d680efe9SMark Fasheh 2991d680efe9SMark Fasheh /* 2992d680efe9SMark Fasheh * If we are the last holder of this dentry lock, there is no 2993d680efe9SMark Fasheh * reason to downconvert so skip straight to the unlock. 2994d680efe9SMark Fasheh */ 2995d680efe9SMark Fasheh if (dl->dl_count == 1) 2996d680efe9SMark Fasheh return UNBLOCK_STOP_POST; 2997d680efe9SMark Fasheh 2998d680efe9SMark Fasheh return UNBLOCK_CONTINUE_POST; 2999d680efe9SMark Fasheh } 3000d680efe9SMark Fasheh 3001ccd979bdSMark Fasheh void ocfs2_process_blocked_lock(struct ocfs2_super *osb, 3002ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 3003ccd979bdSMark Fasheh { 3004ccd979bdSMark Fasheh int status; 3005d680efe9SMark Fasheh struct ocfs2_unblock_ctl ctl = {0, 0,}; 3006ccd979bdSMark Fasheh unsigned long flags; 3007ccd979bdSMark Fasheh 3008ccd979bdSMark Fasheh /* Our reference to the lockres in this function can be 3009ccd979bdSMark Fasheh * considered valid until we remove the OCFS2_LOCK_QUEUED 3010ccd979bdSMark Fasheh * flag. */ 3011ccd979bdSMark Fasheh 3012ccd979bdSMark Fasheh mlog_entry_void(); 3013ccd979bdSMark Fasheh 3014ccd979bdSMark Fasheh BUG_ON(!lockres); 3015ccd979bdSMark Fasheh BUG_ON(!lockres->l_ops); 3016ccd979bdSMark Fasheh 3017ccd979bdSMark Fasheh mlog(0, "lockres %s blocked.\n", lockres->l_name); 3018ccd979bdSMark Fasheh 3019ccd979bdSMark Fasheh /* Detect whether a lock has been marked as going away while 3020ccd979bdSMark Fasheh * the vote thread was processing other things. A lock can 3021ccd979bdSMark Fasheh * still be marked with OCFS2_LOCK_FREEING after this check, 3022ccd979bdSMark Fasheh * but short circuiting here will still save us some 3023ccd979bdSMark Fasheh * performance. */ 3024ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 3025ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING) 3026ccd979bdSMark Fasheh goto unqueue; 3027ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 3028ccd979bdSMark Fasheh 3029b5e500e2SMark Fasheh status = ocfs2_unblock_lock(osb, lockres, &ctl); 3030ccd979bdSMark Fasheh if (status < 0) 3031ccd979bdSMark Fasheh mlog_errno(status); 3032ccd979bdSMark Fasheh 3033ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 3034ccd979bdSMark Fasheh unqueue: 3035d680efe9SMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { 3036ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); 3037ccd979bdSMark Fasheh } else 3038ccd979bdSMark Fasheh ocfs2_schedule_blocked_lock(osb, lockres); 3039ccd979bdSMark Fasheh 3040ccd979bdSMark Fasheh mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, 3041d680efe9SMark Fasheh ctl.requeue ? "yes" : "no"); 3042ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 3043ccd979bdSMark Fasheh 3044d680efe9SMark Fasheh if (ctl.unblock_action != UNBLOCK_CONTINUE 3045d680efe9SMark Fasheh && lockres->l_ops->post_unlock) 3046d680efe9SMark Fasheh lockres->l_ops->post_unlock(osb, lockres); 3047d680efe9SMark Fasheh 3048ccd979bdSMark Fasheh mlog_exit_void(); 3049ccd979bdSMark Fasheh } 3050ccd979bdSMark Fasheh 3051ccd979bdSMark Fasheh static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 3052ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 3053ccd979bdSMark Fasheh { 3054ccd979bdSMark Fasheh mlog_entry_void(); 3055ccd979bdSMark Fasheh 3056ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 3057ccd979bdSMark Fasheh 3058ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING) { 3059ccd979bdSMark Fasheh /* Do not schedule a lock for downconvert when it's on 3060ccd979bdSMark Fasheh * the way to destruction - any nodes wanting access 3061ccd979bdSMark Fasheh * to the resource will get it soon. */ 3062ccd979bdSMark Fasheh mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", 3063ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 3064ccd979bdSMark Fasheh return; 3065ccd979bdSMark Fasheh } 3066ccd979bdSMark Fasheh 3067ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); 3068ccd979bdSMark Fasheh 3069ccd979bdSMark Fasheh spin_lock(&osb->vote_task_lock); 3070ccd979bdSMark Fasheh if (list_empty(&lockres->l_blocked_list)) { 3071ccd979bdSMark Fasheh list_add_tail(&lockres->l_blocked_list, 3072ccd979bdSMark Fasheh &osb->blocked_lock_list); 3073ccd979bdSMark Fasheh osb->blocked_lock_count++; 3074ccd979bdSMark Fasheh } 3075ccd979bdSMark Fasheh spin_unlock(&osb->vote_task_lock); 3076ccd979bdSMark Fasheh 3077ccd979bdSMark Fasheh mlog_exit_void(); 3078ccd979bdSMark Fasheh } 3079ccd979bdSMark Fasheh 3080ccd979bdSMark Fasheh /* This aids in debugging situations where a bad LVB might be involved. */ 3081ccd979bdSMark Fasheh void ocfs2_dump_meta_lvb_info(u64 level, 3082ccd979bdSMark Fasheh const char *function, 3083ccd979bdSMark Fasheh unsigned int line, 3084ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 3085ccd979bdSMark Fasheh { 3086ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 3087ccd979bdSMark Fasheh 3088ccd979bdSMark Fasheh mlog(level, "LVB information for %s (called from %s:%u):\n", 3089ccd979bdSMark Fasheh lockres->l_name, function, line); 3090f9e2d82eSMark Fasheh mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", 3091f9e2d82eSMark Fasheh lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), 3092f9e2d82eSMark Fasheh be32_to_cpu(lvb->lvb_igeneration)); 3093b0697053SMark Fasheh mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", 3094b0697053SMark Fasheh (unsigned long long)be64_to_cpu(lvb->lvb_isize), 3095b0697053SMark Fasheh be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), 3096b0697053SMark Fasheh be16_to_cpu(lvb->lvb_imode)); 3097b0697053SMark Fasheh mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " 3098ca4d147eSHerbert Poetzl "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), 3099b0697053SMark Fasheh (long long)be64_to_cpu(lvb->lvb_iatime_packed), 3100b0697053SMark Fasheh (long long)be64_to_cpu(lvb->lvb_ictime_packed), 3101ca4d147eSHerbert Poetzl (long long)be64_to_cpu(lvb->lvb_imtime_packed), 3102ca4d147eSHerbert Poetzl be32_to_cpu(lvb->lvb_iattr)); 3103ccd979bdSMark Fasheh } 3104