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/crc32.h> 31ccd979bdSMark Fasheh #include <linux/kthread.h> 32ccd979bdSMark Fasheh #include <linux/pagemap.h> 33ccd979bdSMark Fasheh #include <linux/debugfs.h> 34ccd979bdSMark Fasheh #include <linux/seq_file.h> 35ccd979bdSMark Fasheh 36ccd979bdSMark Fasheh #include <cluster/heartbeat.h> 37ccd979bdSMark Fasheh #include <cluster/nodemanager.h> 38ccd979bdSMark Fasheh #include <cluster/tcp.h> 39ccd979bdSMark Fasheh 40ccd979bdSMark Fasheh #include <dlm/dlmapi.h> 41ccd979bdSMark Fasheh 42ccd979bdSMark Fasheh #define MLOG_MASK_PREFIX ML_DLM_GLUE 43ccd979bdSMark Fasheh #include <cluster/masklog.h> 44ccd979bdSMark Fasheh 45ccd979bdSMark Fasheh #include "ocfs2.h" 46ccd979bdSMark Fasheh 47ccd979bdSMark Fasheh #include "alloc.h" 48d680efe9SMark Fasheh #include "dcache.h" 49ccd979bdSMark Fasheh #include "dlmglue.h" 50ccd979bdSMark Fasheh #include "extent_map.h" 517f1a37e3STiger Yang #include "file.h" 52ccd979bdSMark Fasheh #include "heartbeat.h" 53ccd979bdSMark Fasheh #include "inode.h" 54ccd979bdSMark Fasheh #include "journal.h" 55ccd979bdSMark Fasheh #include "slot_map.h" 56ccd979bdSMark Fasheh #include "super.h" 57ccd979bdSMark Fasheh #include "uptodate.h" 58ccd979bdSMark Fasheh #include "vote.h" 59ccd979bdSMark Fasheh 60ccd979bdSMark Fasheh #include "buffer_head_io.h" 61ccd979bdSMark Fasheh 62ccd979bdSMark Fasheh struct ocfs2_mask_waiter { 63ccd979bdSMark Fasheh struct list_head mw_item; 64ccd979bdSMark Fasheh int mw_status; 65ccd979bdSMark Fasheh struct completion mw_complete; 66ccd979bdSMark Fasheh unsigned long mw_mask; 67ccd979bdSMark Fasheh unsigned long mw_goal; 68ccd979bdSMark Fasheh }; 69ccd979bdSMark Fasheh 7054a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres); 7154a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres); 72ccd979bdSMark Fasheh 73d680efe9SMark Fasheh /* 74cc567d89SMark Fasheh * Return value from ->downconvert_worker functions. 75d680efe9SMark Fasheh * 76b5e500e2SMark Fasheh * These control the precise actions of ocfs2_unblock_lock() 77d680efe9SMark Fasheh * and ocfs2_process_blocked_lock() 78d680efe9SMark Fasheh * 79d680efe9SMark Fasheh */ 80d680efe9SMark Fasheh enum ocfs2_unblock_action { 81d680efe9SMark Fasheh UNBLOCK_CONTINUE = 0, /* Continue downconvert */ 82d680efe9SMark Fasheh UNBLOCK_CONTINUE_POST = 1, /* Continue downconvert, fire 83d680efe9SMark Fasheh * ->post_unlock callback */ 84d680efe9SMark Fasheh UNBLOCK_STOP_POST = 2, /* Do not downconvert, fire 85d680efe9SMark Fasheh * ->post_unlock() callback. */ 86d680efe9SMark Fasheh }; 87d680efe9SMark Fasheh 88d680efe9SMark Fasheh struct ocfs2_unblock_ctl { 89d680efe9SMark Fasheh int requeue; 90d680efe9SMark Fasheh enum ocfs2_unblock_action unblock_action; 91d680efe9SMark Fasheh }; 92d680efe9SMark Fasheh 93810d5aebSMark Fasheh static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, 94810d5aebSMark Fasheh int new_level); 95810d5aebSMark Fasheh static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres); 96810d5aebSMark Fasheh 97cc567d89SMark Fasheh static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, 98cc567d89SMark Fasheh int blocking); 99cc567d89SMark Fasheh 100cc567d89SMark Fasheh static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, 101cc567d89SMark Fasheh int blocking); 102d680efe9SMark Fasheh 103d680efe9SMark Fasheh static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 104d680efe9SMark Fasheh struct ocfs2_lock_res *lockres); 105ccd979bdSMark Fasheh 1066cb129f5SAdrian Bunk 1076cb129f5SAdrian Bunk #define mlog_meta_lvb(__level, __lockres) ocfs2_dump_meta_lvb_info(__level, __PRETTY_FUNCTION__, __LINE__, __lockres) 1086cb129f5SAdrian Bunk 1096cb129f5SAdrian Bunk /* This aids in debugging situations where a bad LVB might be involved. */ 1106cb129f5SAdrian Bunk static void ocfs2_dump_meta_lvb_info(u64 level, 1116cb129f5SAdrian Bunk const char *function, 1126cb129f5SAdrian Bunk unsigned int line, 1136cb129f5SAdrian Bunk struct ocfs2_lock_res *lockres) 1146cb129f5SAdrian Bunk { 1156cb129f5SAdrian Bunk struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1166cb129f5SAdrian Bunk 1176cb129f5SAdrian Bunk mlog(level, "LVB information for %s (called from %s:%u):\n", 1186cb129f5SAdrian Bunk lockres->l_name, function, line); 1196cb129f5SAdrian Bunk mlog(level, "version: %u, clusters: %u, generation: 0x%x\n", 1206cb129f5SAdrian Bunk lvb->lvb_version, be32_to_cpu(lvb->lvb_iclusters), 1216cb129f5SAdrian Bunk be32_to_cpu(lvb->lvb_igeneration)); 1226cb129f5SAdrian Bunk mlog(level, "size: %llu, uid %u, gid %u, mode 0x%x\n", 1236cb129f5SAdrian Bunk (unsigned long long)be64_to_cpu(lvb->lvb_isize), 1246cb129f5SAdrian Bunk be32_to_cpu(lvb->lvb_iuid), be32_to_cpu(lvb->lvb_igid), 1256cb129f5SAdrian Bunk be16_to_cpu(lvb->lvb_imode)); 1266cb129f5SAdrian Bunk mlog(level, "nlink %u, atime_packed 0x%llx, ctime_packed 0x%llx, " 1276cb129f5SAdrian Bunk "mtime_packed 0x%llx iattr 0x%x\n", be16_to_cpu(lvb->lvb_inlink), 1286cb129f5SAdrian Bunk (long long)be64_to_cpu(lvb->lvb_iatime_packed), 1296cb129f5SAdrian Bunk (long long)be64_to_cpu(lvb->lvb_ictime_packed), 1306cb129f5SAdrian Bunk (long long)be64_to_cpu(lvb->lvb_imtime_packed), 1316cb129f5SAdrian Bunk be32_to_cpu(lvb->lvb_iattr)); 1326cb129f5SAdrian Bunk } 1336cb129f5SAdrian Bunk 1346cb129f5SAdrian Bunk 135f625c979SMark Fasheh /* 136f625c979SMark Fasheh * OCFS2 Lock Resource Operations 137f625c979SMark Fasheh * 138f625c979SMark Fasheh * These fine tune the behavior of the generic dlmglue locking infrastructure. 1390d5dc6c2SMark Fasheh * 1400d5dc6c2SMark Fasheh * The most basic of lock types can point ->l_priv to their respective 1410d5dc6c2SMark Fasheh * struct ocfs2_super and allow the default actions to manage things. 1420d5dc6c2SMark Fasheh * 1430d5dc6c2SMark Fasheh * Right now, each lock type also needs to implement an init function, 1440d5dc6c2SMark Fasheh * and trivial lock/unlock wrappers. ocfs2_simple_drop_lockres() 1450d5dc6c2SMark Fasheh * should be called when the lock is no longer needed (i.e., object 1460d5dc6c2SMark Fasheh * destruction time). 147f625c979SMark Fasheh */ 148ccd979bdSMark Fasheh struct ocfs2_lock_res_ops { 14954a7e755SMark Fasheh /* 15054a7e755SMark Fasheh * Translate an ocfs2_lock_res * into an ocfs2_super *. Define 15154a7e755SMark Fasheh * this callback if ->l_priv is not an ocfs2_super pointer 15254a7e755SMark Fasheh */ 15354a7e755SMark Fasheh struct ocfs2_super * (*get_osb)(struct ocfs2_lock_res *); 154b5e500e2SMark Fasheh 1550d5dc6c2SMark Fasheh /* 1560d5dc6c2SMark Fasheh * Optionally called in the downconvert (or "vote") thread 1570d5dc6c2SMark Fasheh * after a successful downconvert. The lockres will not be 1580d5dc6c2SMark Fasheh * referenced after this callback is called, so it is safe to 1590d5dc6c2SMark Fasheh * free memory, etc. 1600d5dc6c2SMark Fasheh * 1610d5dc6c2SMark Fasheh * The exact semantics of when this is called are controlled 1620d5dc6c2SMark Fasheh * by ->downconvert_worker() 1630d5dc6c2SMark Fasheh */ 164d680efe9SMark Fasheh void (*post_unlock)(struct ocfs2_super *, struct ocfs2_lock_res *); 165f625c979SMark Fasheh 166f625c979SMark Fasheh /* 16716d5b956SMark Fasheh * Allow a lock type to add checks to determine whether it is 16816d5b956SMark Fasheh * safe to downconvert a lock. Return 0 to re-queue the 16916d5b956SMark Fasheh * downconvert at a later time, nonzero to continue. 17016d5b956SMark Fasheh * 17116d5b956SMark Fasheh * For most locks, the default checks that there are no 17216d5b956SMark Fasheh * incompatible holders are sufficient. 17316d5b956SMark Fasheh * 17416d5b956SMark Fasheh * Called with the lockres spinlock held. 17516d5b956SMark Fasheh */ 17616d5b956SMark Fasheh int (*check_downconvert)(struct ocfs2_lock_res *, int); 17716d5b956SMark Fasheh 17816d5b956SMark Fasheh /* 1795ef0d4eaSMark Fasheh * Allows a lock type to populate the lock value block. This 1805ef0d4eaSMark Fasheh * is called on downconvert, and when we drop a lock. 1815ef0d4eaSMark Fasheh * 1825ef0d4eaSMark Fasheh * Locks that want to use this should set LOCK_TYPE_USES_LVB 1835ef0d4eaSMark Fasheh * in the flags field. 1845ef0d4eaSMark Fasheh * 1855ef0d4eaSMark Fasheh * Called with the lockres spinlock held. 1865ef0d4eaSMark Fasheh */ 1875ef0d4eaSMark Fasheh void (*set_lvb)(struct ocfs2_lock_res *); 1885ef0d4eaSMark Fasheh 1895ef0d4eaSMark Fasheh /* 190cc567d89SMark Fasheh * Called from the downconvert thread when it is determined 191cc567d89SMark Fasheh * that a lock will be downconverted. This is called without 192cc567d89SMark Fasheh * any locks held so the function can do work that might 193cc567d89SMark Fasheh * schedule (syncing out data, etc). 194cc567d89SMark Fasheh * 195cc567d89SMark Fasheh * This should return any one of the ocfs2_unblock_action 196cc567d89SMark Fasheh * values, depending on what it wants the thread to do. 197cc567d89SMark Fasheh */ 198cc567d89SMark Fasheh int (*downconvert_worker)(struct ocfs2_lock_res *, int); 199cc567d89SMark Fasheh 200cc567d89SMark Fasheh /* 201f625c979SMark Fasheh * LOCK_TYPE_* flags which describe the specific requirements 202f625c979SMark Fasheh * of a lock type. Descriptions of each individual flag follow. 203f625c979SMark Fasheh */ 204f625c979SMark Fasheh int flags; 205ccd979bdSMark Fasheh }; 206ccd979bdSMark Fasheh 207f625c979SMark Fasheh /* 208f625c979SMark Fasheh * Some locks want to "refresh" potentially stale data when a 209f625c979SMark Fasheh * meaningful (PRMODE or EXMODE) lock level is first obtained. If this 210f625c979SMark Fasheh * flag is set, the OCFS2_LOCK_NEEDS_REFRESH flag will be set on the 211f625c979SMark Fasheh * individual lockres l_flags member from the ast function. It is 212f625c979SMark Fasheh * expected that the locking wrapper will clear the 213f625c979SMark Fasheh * OCFS2_LOCK_NEEDS_REFRESH flag when done. 214f625c979SMark Fasheh */ 215f625c979SMark Fasheh #define LOCK_TYPE_REQUIRES_REFRESH 0x1 216f625c979SMark Fasheh 217b80fc012SMark Fasheh /* 2185ef0d4eaSMark Fasheh * Indicate that a lock type makes use of the lock value block. The 2195ef0d4eaSMark Fasheh * ->set_lvb lock type callback must be defined. 220b80fc012SMark Fasheh */ 221b80fc012SMark Fasheh #define LOCK_TYPE_USES_LVB 0x2 222b80fc012SMark Fasheh 223ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_rw_lops = { 22454a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 225f625c979SMark Fasheh .flags = 0, 226ccd979bdSMark Fasheh }; 227ccd979bdSMark Fasheh 228ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_meta_lops = { 22954a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 230810d5aebSMark Fasheh .check_downconvert = ocfs2_check_meta_downconvert, 231810d5aebSMark Fasheh .set_lvb = ocfs2_set_meta_lvb, 232b80fc012SMark Fasheh .flags = LOCK_TYPE_REQUIRES_REFRESH|LOCK_TYPE_USES_LVB, 233ccd979bdSMark Fasheh }; 234ccd979bdSMark Fasheh 235ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_inode_data_lops = { 23654a7e755SMark Fasheh .get_osb = ocfs2_get_inode_osb, 237cc567d89SMark Fasheh .downconvert_worker = ocfs2_data_convert_worker, 238f625c979SMark Fasheh .flags = 0, 239ccd979bdSMark Fasheh }; 240ccd979bdSMark Fasheh 241ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_super_lops = { 242f625c979SMark Fasheh .flags = LOCK_TYPE_REQUIRES_REFRESH, 243ccd979bdSMark Fasheh }; 244ccd979bdSMark Fasheh 245ccd979bdSMark Fasheh static struct ocfs2_lock_res_ops ocfs2_rename_lops = { 246f625c979SMark Fasheh .flags = 0, 247ccd979bdSMark Fasheh }; 248ccd979bdSMark Fasheh 249d680efe9SMark Fasheh static struct ocfs2_lock_res_ops ocfs2_dentry_lops = { 25054a7e755SMark Fasheh .get_osb = ocfs2_get_dentry_osb, 251d680efe9SMark Fasheh .post_unlock = ocfs2_dentry_post_unlock, 252cc567d89SMark Fasheh .downconvert_worker = ocfs2_dentry_convert_worker, 253f625c979SMark Fasheh .flags = 0, 254d680efe9SMark Fasheh }; 255d680efe9SMark Fasheh 25650008630STiger Yang static struct ocfs2_lock_res_ops ocfs2_inode_open_lops = { 25750008630STiger Yang .get_osb = ocfs2_get_inode_osb, 25850008630STiger Yang .flags = 0, 25950008630STiger Yang }; 26050008630STiger Yang 261ccd979bdSMark Fasheh static inline int ocfs2_is_inode_lock(struct ocfs2_lock_res *lockres) 262ccd979bdSMark Fasheh { 263ccd979bdSMark Fasheh return lockres->l_type == OCFS2_LOCK_TYPE_META || 264ccd979bdSMark Fasheh lockres->l_type == OCFS2_LOCK_TYPE_DATA || 26550008630STiger Yang lockres->l_type == OCFS2_LOCK_TYPE_RW || 26650008630STiger Yang lockres->l_type == OCFS2_LOCK_TYPE_OPEN; 267ccd979bdSMark Fasheh } 268ccd979bdSMark Fasheh 269ccd979bdSMark Fasheh static inline struct inode *ocfs2_lock_res_inode(struct ocfs2_lock_res *lockres) 270ccd979bdSMark Fasheh { 271ccd979bdSMark Fasheh BUG_ON(!ocfs2_is_inode_lock(lockres)); 272ccd979bdSMark Fasheh 273ccd979bdSMark Fasheh return (struct inode *) lockres->l_priv; 274ccd979bdSMark Fasheh } 275ccd979bdSMark Fasheh 276d680efe9SMark Fasheh static inline struct ocfs2_dentry_lock *ocfs2_lock_res_dl(struct ocfs2_lock_res *lockres) 277d680efe9SMark Fasheh { 278d680efe9SMark Fasheh BUG_ON(lockres->l_type != OCFS2_LOCK_TYPE_DENTRY); 279d680efe9SMark Fasheh 280d680efe9SMark Fasheh return (struct ocfs2_dentry_lock *)lockres->l_priv; 281d680efe9SMark Fasheh } 282d680efe9SMark Fasheh 28354a7e755SMark Fasheh static inline struct ocfs2_super *ocfs2_get_lockres_osb(struct ocfs2_lock_res *lockres) 28454a7e755SMark Fasheh { 28554a7e755SMark Fasheh if (lockres->l_ops->get_osb) 28654a7e755SMark Fasheh return lockres->l_ops->get_osb(lockres); 28754a7e755SMark Fasheh 28854a7e755SMark Fasheh return (struct ocfs2_super *)lockres->l_priv; 28954a7e755SMark Fasheh } 29054a7e755SMark Fasheh 291ccd979bdSMark Fasheh static int ocfs2_lock_create(struct ocfs2_super *osb, 292ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 293ccd979bdSMark Fasheh int level, 294ccd979bdSMark Fasheh int dlm_flags); 295ccd979bdSMark Fasheh static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 296ccd979bdSMark Fasheh int wanted); 297ccd979bdSMark Fasheh static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 298ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 299ccd979bdSMark Fasheh int level); 300ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres); 301ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres); 302ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres); 303ccd979bdSMark Fasheh static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, int level); 304ccd979bdSMark Fasheh static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 305ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres); 306ccd979bdSMark Fasheh static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 307ccd979bdSMark Fasheh int convert); 308ccd979bdSMark Fasheh #define ocfs2_log_dlm_error(_func, _stat, _lockres) do { \ 309ccd979bdSMark Fasheh mlog(ML_ERROR, "Dlm error \"%s\" while calling %s on " \ 310ccd979bdSMark Fasheh "resource %s: %s\n", dlm_errname(_stat), _func, \ 311ccd979bdSMark Fasheh _lockres->l_name, dlm_errmsg(_stat)); \ 312ccd979bdSMark Fasheh } while (0) 313ccd979bdSMark Fasheh static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 314ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres); 315ccd979bdSMark Fasheh static int ocfs2_meta_lock_update(struct inode *inode, 316ccd979bdSMark Fasheh struct buffer_head **bh); 317ccd979bdSMark Fasheh static void ocfs2_drop_osb_locks(struct ocfs2_super *osb); 318ccd979bdSMark Fasheh static inline int ocfs2_highest_compat_lock_level(int level); 319ccd979bdSMark Fasheh 320ccd979bdSMark Fasheh static void ocfs2_build_lock_name(enum ocfs2_lock_type type, 321ccd979bdSMark Fasheh u64 blkno, 322ccd979bdSMark Fasheh u32 generation, 323ccd979bdSMark Fasheh char *name) 324ccd979bdSMark Fasheh { 325ccd979bdSMark Fasheh int len; 326ccd979bdSMark Fasheh 327ccd979bdSMark Fasheh mlog_entry_void(); 328ccd979bdSMark Fasheh 329ccd979bdSMark Fasheh BUG_ON(type >= OCFS2_NUM_LOCK_TYPES); 330ccd979bdSMark Fasheh 331b0697053SMark Fasheh len = snprintf(name, OCFS2_LOCK_ID_MAX_LEN, "%c%s%016llx%08x", 332b0697053SMark Fasheh ocfs2_lock_type_char(type), OCFS2_LOCK_ID_PAD, 333b0697053SMark Fasheh (long long)blkno, generation); 334ccd979bdSMark Fasheh 335ccd979bdSMark Fasheh BUG_ON(len != (OCFS2_LOCK_ID_MAX_LEN - 1)); 336ccd979bdSMark Fasheh 337ccd979bdSMark Fasheh mlog(0, "built lock resource with name: %s\n", name); 338ccd979bdSMark Fasheh 339ccd979bdSMark Fasheh mlog_exit_void(); 340ccd979bdSMark Fasheh } 341ccd979bdSMark Fasheh 34234af946aSIngo Molnar static DEFINE_SPINLOCK(ocfs2_dlm_tracking_lock); 343ccd979bdSMark Fasheh 344ccd979bdSMark Fasheh static void ocfs2_add_lockres_tracking(struct ocfs2_lock_res *res, 345ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug) 346ccd979bdSMark Fasheh { 347ccd979bdSMark Fasheh mlog(0, "Add tracking for lockres %s\n", res->l_name); 348ccd979bdSMark Fasheh 349ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 350ccd979bdSMark Fasheh list_add(&res->l_debug_list, &dlm_debug->d_lockres_tracking); 351ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 352ccd979bdSMark Fasheh } 353ccd979bdSMark Fasheh 354ccd979bdSMark Fasheh static void ocfs2_remove_lockres_tracking(struct ocfs2_lock_res *res) 355ccd979bdSMark Fasheh { 356ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 357ccd979bdSMark Fasheh if (!list_empty(&res->l_debug_list)) 358ccd979bdSMark Fasheh list_del_init(&res->l_debug_list); 359ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 360ccd979bdSMark Fasheh } 361ccd979bdSMark Fasheh 362ccd979bdSMark Fasheh static void ocfs2_lock_res_init_common(struct ocfs2_super *osb, 363ccd979bdSMark Fasheh struct ocfs2_lock_res *res, 364ccd979bdSMark Fasheh enum ocfs2_lock_type type, 365ccd979bdSMark Fasheh struct ocfs2_lock_res_ops *ops, 366ccd979bdSMark Fasheh void *priv) 367ccd979bdSMark Fasheh { 368ccd979bdSMark Fasheh res->l_type = type; 369ccd979bdSMark Fasheh res->l_ops = ops; 370ccd979bdSMark Fasheh res->l_priv = priv; 371ccd979bdSMark Fasheh 372ccd979bdSMark Fasheh res->l_level = LKM_IVMODE; 373ccd979bdSMark Fasheh res->l_requested = LKM_IVMODE; 374ccd979bdSMark Fasheh res->l_blocking = LKM_IVMODE; 375ccd979bdSMark Fasheh res->l_action = OCFS2_AST_INVALID; 376ccd979bdSMark Fasheh res->l_unlock_action = OCFS2_UNLOCK_INVALID; 377ccd979bdSMark Fasheh 378ccd979bdSMark Fasheh res->l_flags = OCFS2_LOCK_INITIALIZED; 379ccd979bdSMark Fasheh 380ccd979bdSMark Fasheh ocfs2_add_lockres_tracking(res, osb->osb_dlm_debug); 381ccd979bdSMark Fasheh } 382ccd979bdSMark Fasheh 383ccd979bdSMark Fasheh void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res) 384ccd979bdSMark Fasheh { 385ccd979bdSMark Fasheh /* This also clears out the lock status block */ 386ccd979bdSMark Fasheh memset(res, 0, sizeof(struct ocfs2_lock_res)); 387ccd979bdSMark Fasheh spin_lock_init(&res->l_lock); 388ccd979bdSMark Fasheh init_waitqueue_head(&res->l_event); 389ccd979bdSMark Fasheh INIT_LIST_HEAD(&res->l_blocked_list); 390ccd979bdSMark Fasheh INIT_LIST_HEAD(&res->l_mask_waiters); 391ccd979bdSMark Fasheh } 392ccd979bdSMark Fasheh 393ccd979bdSMark Fasheh void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res, 394ccd979bdSMark Fasheh enum ocfs2_lock_type type, 39524c19ef4SMark Fasheh unsigned int generation, 396ccd979bdSMark Fasheh struct inode *inode) 397ccd979bdSMark Fasheh { 398ccd979bdSMark Fasheh struct ocfs2_lock_res_ops *ops; 399ccd979bdSMark Fasheh 400ccd979bdSMark Fasheh switch(type) { 401ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_RW: 402ccd979bdSMark Fasheh ops = &ocfs2_inode_rw_lops; 403ccd979bdSMark Fasheh break; 404ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_META: 405ccd979bdSMark Fasheh ops = &ocfs2_inode_meta_lops; 406ccd979bdSMark Fasheh break; 407ccd979bdSMark Fasheh case OCFS2_LOCK_TYPE_DATA: 408ccd979bdSMark Fasheh ops = &ocfs2_inode_data_lops; 409ccd979bdSMark Fasheh break; 41050008630STiger Yang case OCFS2_LOCK_TYPE_OPEN: 41150008630STiger Yang ops = &ocfs2_inode_open_lops; 41250008630STiger Yang break; 413ccd979bdSMark Fasheh default: 414ccd979bdSMark Fasheh mlog_bug_on_msg(1, "type: %d\n", type); 415ccd979bdSMark Fasheh ops = NULL; /* thanks, gcc */ 416ccd979bdSMark Fasheh break; 417ccd979bdSMark Fasheh }; 418ccd979bdSMark Fasheh 419d680efe9SMark Fasheh ocfs2_build_lock_name(type, OCFS2_I(inode)->ip_blkno, 42024c19ef4SMark Fasheh generation, res->l_name); 421d680efe9SMark Fasheh ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), res, type, ops, inode); 422d680efe9SMark Fasheh } 423d680efe9SMark Fasheh 42454a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_inode_osb(struct ocfs2_lock_res *lockres) 42554a7e755SMark Fasheh { 42654a7e755SMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 42754a7e755SMark Fasheh 42854a7e755SMark Fasheh return OCFS2_SB(inode->i_sb); 42954a7e755SMark Fasheh } 43054a7e755SMark Fasheh 431d680efe9SMark Fasheh static __u64 ocfs2_get_dentry_lock_ino(struct ocfs2_lock_res *lockres) 432d680efe9SMark Fasheh { 433d680efe9SMark Fasheh __be64 inode_blkno_be; 434d680efe9SMark Fasheh 435d680efe9SMark Fasheh memcpy(&inode_blkno_be, &lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], 436d680efe9SMark Fasheh sizeof(__be64)); 437d680efe9SMark Fasheh 438d680efe9SMark Fasheh return be64_to_cpu(inode_blkno_be); 439d680efe9SMark Fasheh } 440d680efe9SMark Fasheh 44154a7e755SMark Fasheh static struct ocfs2_super *ocfs2_get_dentry_osb(struct ocfs2_lock_res *lockres) 44254a7e755SMark Fasheh { 44354a7e755SMark Fasheh struct ocfs2_dentry_lock *dl = lockres->l_priv; 44454a7e755SMark Fasheh 44554a7e755SMark Fasheh return OCFS2_SB(dl->dl_inode->i_sb); 44654a7e755SMark Fasheh } 44754a7e755SMark Fasheh 448d680efe9SMark Fasheh void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl, 449d680efe9SMark Fasheh u64 parent, struct inode *inode) 450d680efe9SMark Fasheh { 451d680efe9SMark Fasheh int len; 452d680efe9SMark Fasheh u64 inode_blkno = OCFS2_I(inode)->ip_blkno; 453d680efe9SMark Fasheh __be64 inode_blkno_be = cpu_to_be64(inode_blkno); 454d680efe9SMark Fasheh struct ocfs2_lock_res *lockres = &dl->dl_lockres; 455d680efe9SMark Fasheh 456d680efe9SMark Fasheh ocfs2_lock_res_init_once(lockres); 457d680efe9SMark Fasheh 458d680efe9SMark Fasheh /* 459d680efe9SMark Fasheh * Unfortunately, the standard lock naming scheme won't work 460d680efe9SMark Fasheh * here because we have two 16 byte values to use. Instead, 461d680efe9SMark Fasheh * we'll stuff the inode number as a binary value. We still 462d680efe9SMark Fasheh * want error prints to show something without garbling the 463d680efe9SMark Fasheh * display, so drop a null byte in there before the inode 464d680efe9SMark Fasheh * number. A future version of OCFS2 will likely use all 465d680efe9SMark Fasheh * binary lock names. The stringified names have been a 466d680efe9SMark Fasheh * tremendous aid in debugging, but now that the debugfs 467d680efe9SMark Fasheh * interface exists, we can mangle things there if need be. 468d680efe9SMark Fasheh * 469d680efe9SMark Fasheh * NOTE: We also drop the standard "pad" value (the total lock 470d680efe9SMark Fasheh * name size stays the same though - the last part is all 471d680efe9SMark Fasheh * zeros due to the memset in ocfs2_lock_res_init_once() 472d680efe9SMark Fasheh */ 473d680efe9SMark Fasheh len = snprintf(lockres->l_name, OCFS2_DENTRY_LOCK_INO_START, 474d680efe9SMark Fasheh "%c%016llx", 475d680efe9SMark Fasheh ocfs2_lock_type_char(OCFS2_LOCK_TYPE_DENTRY), 476d680efe9SMark Fasheh (long long)parent); 477d680efe9SMark Fasheh 478d680efe9SMark Fasheh BUG_ON(len != (OCFS2_DENTRY_LOCK_INO_START - 1)); 479d680efe9SMark Fasheh 480d680efe9SMark Fasheh memcpy(&lockres->l_name[OCFS2_DENTRY_LOCK_INO_START], &inode_blkno_be, 481d680efe9SMark Fasheh sizeof(__be64)); 482d680efe9SMark Fasheh 483d680efe9SMark Fasheh ocfs2_lock_res_init_common(OCFS2_SB(inode->i_sb), lockres, 484d680efe9SMark Fasheh OCFS2_LOCK_TYPE_DENTRY, &ocfs2_dentry_lops, 485d680efe9SMark Fasheh dl); 486ccd979bdSMark Fasheh } 487ccd979bdSMark Fasheh 488ccd979bdSMark Fasheh static void ocfs2_super_lock_res_init(struct ocfs2_lock_res *res, 489ccd979bdSMark Fasheh struct ocfs2_super *osb) 490ccd979bdSMark Fasheh { 491ccd979bdSMark Fasheh /* Superblock lockres doesn't come from a slab so we call init 492ccd979bdSMark Fasheh * once on it manually. */ 493ccd979bdSMark Fasheh ocfs2_lock_res_init_once(res); 494d680efe9SMark Fasheh ocfs2_build_lock_name(OCFS2_LOCK_TYPE_SUPER, OCFS2_SUPER_BLOCK_BLKNO, 495d680efe9SMark Fasheh 0, res->l_name); 496ccd979bdSMark Fasheh ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_SUPER, 497ccd979bdSMark Fasheh &ocfs2_super_lops, osb); 498ccd979bdSMark Fasheh } 499ccd979bdSMark Fasheh 500ccd979bdSMark Fasheh static void ocfs2_rename_lock_res_init(struct ocfs2_lock_res *res, 501ccd979bdSMark Fasheh struct ocfs2_super *osb) 502ccd979bdSMark Fasheh { 503ccd979bdSMark Fasheh /* Rename lockres doesn't come from a slab so we call init 504ccd979bdSMark Fasheh * once on it manually. */ 505ccd979bdSMark Fasheh ocfs2_lock_res_init_once(res); 506d680efe9SMark Fasheh ocfs2_build_lock_name(OCFS2_LOCK_TYPE_RENAME, 0, 0, res->l_name); 507d680efe9SMark Fasheh ocfs2_lock_res_init_common(osb, res, OCFS2_LOCK_TYPE_RENAME, 508ccd979bdSMark Fasheh &ocfs2_rename_lops, osb); 509ccd979bdSMark Fasheh } 510ccd979bdSMark Fasheh 511ccd979bdSMark Fasheh void ocfs2_lock_res_free(struct ocfs2_lock_res *res) 512ccd979bdSMark Fasheh { 513ccd979bdSMark Fasheh mlog_entry_void(); 514ccd979bdSMark Fasheh 515ccd979bdSMark Fasheh if (!(res->l_flags & OCFS2_LOCK_INITIALIZED)) 516ccd979bdSMark Fasheh return; 517ccd979bdSMark Fasheh 518ccd979bdSMark Fasheh ocfs2_remove_lockres_tracking(res); 519ccd979bdSMark Fasheh 520ccd979bdSMark Fasheh mlog_bug_on_msg(!list_empty(&res->l_blocked_list), 521ccd979bdSMark Fasheh "Lockres %s is on the blocked list\n", 522ccd979bdSMark Fasheh res->l_name); 523ccd979bdSMark Fasheh mlog_bug_on_msg(!list_empty(&res->l_mask_waiters), 524ccd979bdSMark Fasheh "Lockres %s has mask waiters pending\n", 525ccd979bdSMark Fasheh res->l_name); 526ccd979bdSMark Fasheh mlog_bug_on_msg(spin_is_locked(&res->l_lock), 527ccd979bdSMark Fasheh "Lockres %s is locked\n", 528ccd979bdSMark Fasheh res->l_name); 529ccd979bdSMark Fasheh mlog_bug_on_msg(res->l_ro_holders, 530ccd979bdSMark Fasheh "Lockres %s has %u ro holders\n", 531ccd979bdSMark Fasheh res->l_name, res->l_ro_holders); 532ccd979bdSMark Fasheh mlog_bug_on_msg(res->l_ex_holders, 533ccd979bdSMark Fasheh "Lockres %s has %u ex holders\n", 534ccd979bdSMark Fasheh res->l_name, res->l_ex_holders); 535ccd979bdSMark Fasheh 536ccd979bdSMark Fasheh /* Need to clear out the lock status block for the dlm */ 537ccd979bdSMark Fasheh memset(&res->l_lksb, 0, sizeof(res->l_lksb)); 538ccd979bdSMark Fasheh 539ccd979bdSMark Fasheh res->l_flags = 0UL; 540ccd979bdSMark Fasheh mlog_exit_void(); 541ccd979bdSMark Fasheh } 542ccd979bdSMark Fasheh 543ccd979bdSMark Fasheh static inline void ocfs2_inc_holders(struct ocfs2_lock_res *lockres, 544ccd979bdSMark Fasheh int level) 545ccd979bdSMark Fasheh { 546ccd979bdSMark Fasheh mlog_entry_void(); 547ccd979bdSMark Fasheh 548ccd979bdSMark Fasheh BUG_ON(!lockres); 549ccd979bdSMark Fasheh 550ccd979bdSMark Fasheh switch(level) { 551ccd979bdSMark Fasheh case LKM_EXMODE: 552ccd979bdSMark Fasheh lockres->l_ex_holders++; 553ccd979bdSMark Fasheh break; 554ccd979bdSMark Fasheh case LKM_PRMODE: 555ccd979bdSMark Fasheh lockres->l_ro_holders++; 556ccd979bdSMark Fasheh break; 557ccd979bdSMark Fasheh default: 558ccd979bdSMark Fasheh BUG(); 559ccd979bdSMark Fasheh } 560ccd979bdSMark Fasheh 561ccd979bdSMark Fasheh mlog_exit_void(); 562ccd979bdSMark Fasheh } 563ccd979bdSMark Fasheh 564ccd979bdSMark Fasheh static inline void ocfs2_dec_holders(struct ocfs2_lock_res *lockres, 565ccd979bdSMark Fasheh int level) 566ccd979bdSMark Fasheh { 567ccd979bdSMark Fasheh mlog_entry_void(); 568ccd979bdSMark Fasheh 569ccd979bdSMark Fasheh BUG_ON(!lockres); 570ccd979bdSMark Fasheh 571ccd979bdSMark Fasheh switch(level) { 572ccd979bdSMark Fasheh case LKM_EXMODE: 573ccd979bdSMark Fasheh BUG_ON(!lockres->l_ex_holders); 574ccd979bdSMark Fasheh lockres->l_ex_holders--; 575ccd979bdSMark Fasheh break; 576ccd979bdSMark Fasheh case LKM_PRMODE: 577ccd979bdSMark Fasheh BUG_ON(!lockres->l_ro_holders); 578ccd979bdSMark Fasheh lockres->l_ro_holders--; 579ccd979bdSMark Fasheh break; 580ccd979bdSMark Fasheh default: 581ccd979bdSMark Fasheh BUG(); 582ccd979bdSMark Fasheh } 583ccd979bdSMark Fasheh mlog_exit_void(); 584ccd979bdSMark Fasheh } 585ccd979bdSMark Fasheh 586ccd979bdSMark Fasheh /* WARNING: This function lives in a world where the only three lock 587ccd979bdSMark Fasheh * levels are EX, PR, and NL. It *will* have to be adjusted when more 588ccd979bdSMark Fasheh * lock types are added. */ 589ccd979bdSMark Fasheh static inline int ocfs2_highest_compat_lock_level(int level) 590ccd979bdSMark Fasheh { 591ccd979bdSMark Fasheh int new_level = LKM_EXMODE; 592ccd979bdSMark Fasheh 593ccd979bdSMark Fasheh if (level == LKM_EXMODE) 594ccd979bdSMark Fasheh new_level = LKM_NLMODE; 595ccd979bdSMark Fasheh else if (level == LKM_PRMODE) 596ccd979bdSMark Fasheh new_level = LKM_PRMODE; 597ccd979bdSMark Fasheh return new_level; 598ccd979bdSMark Fasheh } 599ccd979bdSMark Fasheh 600ccd979bdSMark Fasheh static void lockres_set_flags(struct ocfs2_lock_res *lockres, 601ccd979bdSMark Fasheh unsigned long newflags) 602ccd979bdSMark Fasheh { 603800deef3SChristoph Hellwig struct ocfs2_mask_waiter *mw, *tmp; 604ccd979bdSMark Fasheh 605ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 606ccd979bdSMark Fasheh 607ccd979bdSMark Fasheh lockres->l_flags = newflags; 608ccd979bdSMark Fasheh 609800deef3SChristoph Hellwig list_for_each_entry_safe(mw, tmp, &lockres->l_mask_waiters, mw_item) { 610ccd979bdSMark Fasheh if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 611ccd979bdSMark Fasheh continue; 612ccd979bdSMark Fasheh 613ccd979bdSMark Fasheh list_del_init(&mw->mw_item); 614ccd979bdSMark Fasheh mw->mw_status = 0; 615ccd979bdSMark Fasheh complete(&mw->mw_complete); 616ccd979bdSMark Fasheh } 617ccd979bdSMark Fasheh } 618ccd979bdSMark Fasheh static void lockres_or_flags(struct ocfs2_lock_res *lockres, unsigned long or) 619ccd979bdSMark Fasheh { 620ccd979bdSMark Fasheh lockres_set_flags(lockres, lockres->l_flags | or); 621ccd979bdSMark Fasheh } 622ccd979bdSMark Fasheh static void lockres_clear_flags(struct ocfs2_lock_res *lockres, 623ccd979bdSMark Fasheh unsigned long clear) 624ccd979bdSMark Fasheh { 625ccd979bdSMark Fasheh lockres_set_flags(lockres, lockres->l_flags & ~clear); 626ccd979bdSMark Fasheh } 627ccd979bdSMark Fasheh 628ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_downconvert_action(struct ocfs2_lock_res *lockres) 629ccd979bdSMark Fasheh { 630ccd979bdSMark Fasheh mlog_entry_void(); 631ccd979bdSMark Fasheh 632ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 633ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 634ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 635ccd979bdSMark Fasheh BUG_ON(lockres->l_blocking <= LKM_NLMODE); 636ccd979bdSMark Fasheh 637ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 638ccd979bdSMark Fasheh if (lockres->l_level <= 639ccd979bdSMark Fasheh ocfs2_highest_compat_lock_level(lockres->l_blocking)) { 640ccd979bdSMark Fasheh lockres->l_blocking = LKM_NLMODE; 641ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BLOCKED); 642ccd979bdSMark Fasheh } 643ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 644ccd979bdSMark Fasheh 645ccd979bdSMark Fasheh mlog_exit_void(); 646ccd979bdSMark Fasheh } 647ccd979bdSMark Fasheh 648ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_convert_action(struct ocfs2_lock_res *lockres) 649ccd979bdSMark Fasheh { 650ccd979bdSMark Fasheh mlog_entry_void(); 651ccd979bdSMark Fasheh 652ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BUSY)); 653ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_ATTACHED)); 654ccd979bdSMark Fasheh 655ccd979bdSMark Fasheh /* Convert from RO to EX doesn't really need anything as our 656ccd979bdSMark Fasheh * information is already up to data. Convert from NL to 657ccd979bdSMark Fasheh * *anything* however should mark ourselves as needing an 658ccd979bdSMark Fasheh * update */ 659f625c979SMark Fasheh if (lockres->l_level == LKM_NLMODE && 660f625c979SMark Fasheh lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 661ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 662ccd979bdSMark Fasheh 663ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 664ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 665ccd979bdSMark Fasheh 666ccd979bdSMark Fasheh mlog_exit_void(); 667ccd979bdSMark Fasheh } 668ccd979bdSMark Fasheh 669ccd979bdSMark Fasheh static inline void ocfs2_generic_handle_attach_action(struct ocfs2_lock_res *lockres) 670ccd979bdSMark Fasheh { 671ccd979bdSMark Fasheh mlog_entry_void(); 672ccd979bdSMark Fasheh 6733cf0c507SRoel Kluin BUG_ON((!(lockres->l_flags & OCFS2_LOCK_BUSY))); 674ccd979bdSMark Fasheh BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 675ccd979bdSMark Fasheh 676ccd979bdSMark Fasheh if (lockres->l_requested > LKM_NLMODE && 677f625c979SMark Fasheh !(lockres->l_flags & OCFS2_LOCK_LOCAL) && 678f625c979SMark Fasheh lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 679ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 680ccd979bdSMark Fasheh 681ccd979bdSMark Fasheh lockres->l_level = lockres->l_requested; 682ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_ATTACHED); 683ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 684ccd979bdSMark Fasheh 685ccd979bdSMark Fasheh mlog_exit_void(); 686ccd979bdSMark Fasheh } 687ccd979bdSMark Fasheh 688ccd979bdSMark Fasheh static int ocfs2_generic_handle_bast(struct ocfs2_lock_res *lockres, 689ccd979bdSMark Fasheh int level) 690ccd979bdSMark Fasheh { 691ccd979bdSMark Fasheh int needs_downconvert = 0; 692ccd979bdSMark Fasheh mlog_entry_void(); 693ccd979bdSMark Fasheh 694ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 695ccd979bdSMark Fasheh 696ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BLOCKED); 697ccd979bdSMark Fasheh 698ccd979bdSMark Fasheh if (level > lockres->l_blocking) { 699ccd979bdSMark Fasheh /* only schedule a downconvert if we haven't already scheduled 700ccd979bdSMark Fasheh * one that goes low enough to satisfy the level we're 701ccd979bdSMark Fasheh * blocking. this also catches the case where we get 702ccd979bdSMark Fasheh * duplicate BASTs */ 703ccd979bdSMark Fasheh if (ocfs2_highest_compat_lock_level(level) < 704ccd979bdSMark Fasheh ocfs2_highest_compat_lock_level(lockres->l_blocking)) 705ccd979bdSMark Fasheh needs_downconvert = 1; 706ccd979bdSMark Fasheh 707ccd979bdSMark Fasheh lockres->l_blocking = level; 708ccd979bdSMark Fasheh } 709ccd979bdSMark Fasheh 710ccd979bdSMark Fasheh mlog_exit(needs_downconvert); 711ccd979bdSMark Fasheh return needs_downconvert; 712ccd979bdSMark Fasheh } 713ccd979bdSMark Fasheh 714aa2623adSMark Fasheh static void ocfs2_blocking_ast(void *opaque, int level) 715ccd979bdSMark Fasheh { 716aa2623adSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 717aa2623adSMark Fasheh struct ocfs2_super *osb = ocfs2_get_lockres_osb(lockres); 718ccd979bdSMark Fasheh int needs_downconvert; 719ccd979bdSMark Fasheh unsigned long flags; 720ccd979bdSMark Fasheh 721ccd979bdSMark Fasheh BUG_ON(level <= LKM_NLMODE); 722ccd979bdSMark Fasheh 723aa2623adSMark Fasheh mlog(0, "BAST fired for lockres %s, blocking %d, level %d type %s\n", 724aa2623adSMark Fasheh lockres->l_name, level, lockres->l_level, 725aa2623adSMark Fasheh ocfs2_lock_type_string(lockres->l_type)); 726aa2623adSMark Fasheh 727ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 728ccd979bdSMark Fasheh needs_downconvert = ocfs2_generic_handle_bast(lockres, level); 729ccd979bdSMark Fasheh if (needs_downconvert) 730ccd979bdSMark Fasheh ocfs2_schedule_blocked_lock(osb, lockres); 731ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 732ccd979bdSMark Fasheh 733d680efe9SMark Fasheh wake_up(&lockres->l_event); 734d680efe9SMark Fasheh 735ccd979bdSMark Fasheh ocfs2_kick_vote_thread(osb); 736ccd979bdSMark Fasheh } 737ccd979bdSMark Fasheh 738e92d57dfSMark Fasheh static void ocfs2_locking_ast(void *opaque) 739ccd979bdSMark Fasheh { 740e92d57dfSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 741ccd979bdSMark Fasheh struct dlm_lockstatus *lksb = &lockres->l_lksb; 742ccd979bdSMark Fasheh unsigned long flags; 743ccd979bdSMark Fasheh 744ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 745ccd979bdSMark Fasheh 746ccd979bdSMark Fasheh if (lksb->status != DLM_NORMAL) { 747ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres %s: lksb status value of %u!\n", 748ccd979bdSMark Fasheh lockres->l_name, lksb->status); 749ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 750ccd979bdSMark Fasheh return; 751ccd979bdSMark Fasheh } 752ccd979bdSMark Fasheh 753ccd979bdSMark Fasheh switch(lockres->l_action) { 754ccd979bdSMark Fasheh case OCFS2_AST_ATTACH: 755ccd979bdSMark Fasheh ocfs2_generic_handle_attach_action(lockres); 756e92d57dfSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_LOCAL); 757ccd979bdSMark Fasheh break; 758ccd979bdSMark Fasheh case OCFS2_AST_CONVERT: 759ccd979bdSMark Fasheh ocfs2_generic_handle_convert_action(lockres); 760ccd979bdSMark Fasheh break; 761ccd979bdSMark Fasheh case OCFS2_AST_DOWNCONVERT: 762ccd979bdSMark Fasheh ocfs2_generic_handle_downconvert_action(lockres); 763ccd979bdSMark Fasheh break; 764ccd979bdSMark Fasheh default: 765e92d57dfSMark Fasheh mlog(ML_ERROR, "lockres %s: ast fired with invalid action: %u " 766e92d57dfSMark Fasheh "lockres flags = 0x%lx, unlock action: %u\n", 767e92d57dfSMark Fasheh lockres->l_name, lockres->l_action, lockres->l_flags, 768e92d57dfSMark Fasheh lockres->l_unlock_action); 769ccd979bdSMark Fasheh BUG(); 770ccd979bdSMark Fasheh } 771ccd979bdSMark Fasheh 772ccd979bdSMark Fasheh /* set it to something invalid so if we get called again we 773ccd979bdSMark Fasheh * can catch it. */ 774ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 775ccd979bdSMark Fasheh 776ccd979bdSMark Fasheh wake_up(&lockres->l_event); 777d680efe9SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 778ccd979bdSMark Fasheh } 779ccd979bdSMark Fasheh 780ccd979bdSMark Fasheh static inline void ocfs2_recover_from_dlm_error(struct ocfs2_lock_res *lockres, 781ccd979bdSMark Fasheh int convert) 782ccd979bdSMark Fasheh { 783ccd979bdSMark Fasheh unsigned long flags; 784ccd979bdSMark Fasheh 785ccd979bdSMark Fasheh mlog_entry_void(); 786ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 787ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 788ccd979bdSMark Fasheh if (convert) 789ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 790ccd979bdSMark Fasheh else 791ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 792ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 793ccd979bdSMark Fasheh 794ccd979bdSMark Fasheh wake_up(&lockres->l_event); 795ccd979bdSMark Fasheh mlog_exit_void(); 796ccd979bdSMark Fasheh } 797ccd979bdSMark Fasheh 798ccd979bdSMark Fasheh /* Note: If we detect another process working on the lock (i.e., 799ccd979bdSMark Fasheh * OCFS2_LOCK_BUSY), we'll bail out returning 0. It's up to the caller 800ccd979bdSMark Fasheh * to do the right thing in that case. 801ccd979bdSMark Fasheh */ 802ccd979bdSMark Fasheh static int ocfs2_lock_create(struct ocfs2_super *osb, 803ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 804ccd979bdSMark Fasheh int level, 805ccd979bdSMark Fasheh int dlm_flags) 806ccd979bdSMark Fasheh { 807ccd979bdSMark Fasheh int ret = 0; 808c271c5c2SSunil Mushran enum dlm_status status = DLM_NORMAL; 809ccd979bdSMark Fasheh unsigned long flags; 810ccd979bdSMark Fasheh 811ccd979bdSMark Fasheh mlog_entry_void(); 812ccd979bdSMark Fasheh 813ccd979bdSMark Fasheh mlog(0, "lock %s, level = %d, flags = %d\n", lockres->l_name, level, 814ccd979bdSMark Fasheh dlm_flags); 815ccd979bdSMark Fasheh 816ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 817ccd979bdSMark Fasheh if ((lockres->l_flags & OCFS2_LOCK_ATTACHED) || 818ccd979bdSMark Fasheh (lockres->l_flags & OCFS2_LOCK_BUSY)) { 819ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 820ccd979bdSMark Fasheh goto bail; 821ccd979bdSMark Fasheh } 822ccd979bdSMark Fasheh 823ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_ATTACH; 824ccd979bdSMark Fasheh lockres->l_requested = level; 825ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 826ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 827ccd979bdSMark Fasheh 828ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 829ccd979bdSMark Fasheh level, 830ccd979bdSMark Fasheh &lockres->l_lksb, 831ccd979bdSMark Fasheh dlm_flags, 832ccd979bdSMark Fasheh lockres->l_name, 833f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 834e92d57dfSMark Fasheh ocfs2_locking_ast, 835ccd979bdSMark Fasheh lockres, 836aa2623adSMark Fasheh ocfs2_blocking_ast); 837ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 838ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, lockres); 839ccd979bdSMark Fasheh ret = -EINVAL; 840ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 841ccd979bdSMark Fasheh } 842ccd979bdSMark Fasheh 843ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmlock\n", lockres->l_name); 844ccd979bdSMark Fasheh 845ccd979bdSMark Fasheh bail: 846ccd979bdSMark Fasheh mlog_exit(ret); 847ccd979bdSMark Fasheh return ret; 848ccd979bdSMark Fasheh } 849ccd979bdSMark Fasheh 850ccd979bdSMark Fasheh static inline int ocfs2_check_wait_flag(struct ocfs2_lock_res *lockres, 851ccd979bdSMark Fasheh int flag) 852ccd979bdSMark Fasheh { 853ccd979bdSMark Fasheh unsigned long flags; 854ccd979bdSMark Fasheh int ret; 855ccd979bdSMark Fasheh 856ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 857ccd979bdSMark Fasheh ret = lockres->l_flags & flag; 858ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 859ccd979bdSMark Fasheh 860ccd979bdSMark Fasheh return ret; 861ccd979bdSMark Fasheh } 862ccd979bdSMark Fasheh 863ccd979bdSMark Fasheh static inline void ocfs2_wait_on_busy_lock(struct ocfs2_lock_res *lockres) 864ccd979bdSMark Fasheh 865ccd979bdSMark Fasheh { 866ccd979bdSMark Fasheh wait_event(lockres->l_event, 867ccd979bdSMark Fasheh !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_BUSY)); 868ccd979bdSMark Fasheh } 869ccd979bdSMark Fasheh 870ccd979bdSMark Fasheh static inline void ocfs2_wait_on_refreshing_lock(struct ocfs2_lock_res *lockres) 871ccd979bdSMark Fasheh 872ccd979bdSMark Fasheh { 873ccd979bdSMark Fasheh wait_event(lockres->l_event, 874ccd979bdSMark Fasheh !ocfs2_check_wait_flag(lockres, OCFS2_LOCK_REFRESHING)); 875ccd979bdSMark Fasheh } 876ccd979bdSMark Fasheh 877ccd979bdSMark Fasheh /* predict what lock level we'll be dropping down to on behalf 878ccd979bdSMark Fasheh * of another node, and return true if the currently wanted 879ccd979bdSMark Fasheh * level will be compatible with it. */ 880ccd979bdSMark Fasheh static inline int ocfs2_may_continue_on_blocked_lock(struct ocfs2_lock_res *lockres, 881ccd979bdSMark Fasheh int wanted) 882ccd979bdSMark Fasheh { 883ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 884ccd979bdSMark Fasheh 885ccd979bdSMark Fasheh return wanted <= ocfs2_highest_compat_lock_level(lockres->l_blocking); 886ccd979bdSMark Fasheh } 887ccd979bdSMark Fasheh 888ccd979bdSMark Fasheh static void ocfs2_init_mask_waiter(struct ocfs2_mask_waiter *mw) 889ccd979bdSMark Fasheh { 890ccd979bdSMark Fasheh INIT_LIST_HEAD(&mw->mw_item); 891ccd979bdSMark Fasheh init_completion(&mw->mw_complete); 892ccd979bdSMark Fasheh } 893ccd979bdSMark Fasheh 894ccd979bdSMark Fasheh static int ocfs2_wait_for_mask(struct ocfs2_mask_waiter *mw) 895ccd979bdSMark Fasheh { 896ccd979bdSMark Fasheh wait_for_completion(&mw->mw_complete); 897ccd979bdSMark Fasheh /* Re-arm the completion in case we want to wait on it again */ 898ccd979bdSMark Fasheh INIT_COMPLETION(mw->mw_complete); 899ccd979bdSMark Fasheh return mw->mw_status; 900ccd979bdSMark Fasheh } 901ccd979bdSMark Fasheh 902ccd979bdSMark Fasheh static void lockres_add_mask_waiter(struct ocfs2_lock_res *lockres, 903ccd979bdSMark Fasheh struct ocfs2_mask_waiter *mw, 904ccd979bdSMark Fasheh unsigned long mask, 905ccd979bdSMark Fasheh unsigned long goal) 906ccd979bdSMark Fasheh { 907ccd979bdSMark Fasheh BUG_ON(!list_empty(&mw->mw_item)); 908ccd979bdSMark Fasheh 909ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 910ccd979bdSMark Fasheh 911ccd979bdSMark Fasheh list_add_tail(&mw->mw_item, &lockres->l_mask_waiters); 912ccd979bdSMark Fasheh mw->mw_mask = mask; 913ccd979bdSMark Fasheh mw->mw_goal = goal; 914ccd979bdSMark Fasheh } 915ccd979bdSMark Fasheh 916ccd979bdSMark Fasheh /* returns 0 if the mw that was removed was already satisfied, -EBUSY 917ccd979bdSMark Fasheh * if the mask still hadn't reached its goal */ 918ccd979bdSMark Fasheh static int lockres_remove_mask_waiter(struct ocfs2_lock_res *lockres, 919ccd979bdSMark Fasheh struct ocfs2_mask_waiter *mw) 920ccd979bdSMark Fasheh { 921ccd979bdSMark Fasheh unsigned long flags; 922ccd979bdSMark Fasheh int ret = 0; 923ccd979bdSMark Fasheh 924ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 925ccd979bdSMark Fasheh if (!list_empty(&mw->mw_item)) { 926ccd979bdSMark Fasheh if ((lockres->l_flags & mw->mw_mask) != mw->mw_goal) 927ccd979bdSMark Fasheh ret = -EBUSY; 928ccd979bdSMark Fasheh 929ccd979bdSMark Fasheh list_del_init(&mw->mw_item); 930ccd979bdSMark Fasheh init_completion(&mw->mw_complete); 931ccd979bdSMark Fasheh } 932ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 933ccd979bdSMark Fasheh 934ccd979bdSMark Fasheh return ret; 935ccd979bdSMark Fasheh 936ccd979bdSMark Fasheh } 937ccd979bdSMark Fasheh 938ccd979bdSMark Fasheh static int ocfs2_cluster_lock(struct ocfs2_super *osb, 939ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 940ccd979bdSMark Fasheh int level, 941ccd979bdSMark Fasheh int lkm_flags, 942ccd979bdSMark Fasheh int arg_flags) 943ccd979bdSMark Fasheh { 944ccd979bdSMark Fasheh struct ocfs2_mask_waiter mw; 945ccd979bdSMark Fasheh enum dlm_status status; 946ccd979bdSMark Fasheh int wait, catch_signals = !(osb->s_mount_opt & OCFS2_MOUNT_NOINTR); 947ccd979bdSMark Fasheh int ret = 0; /* gcc doesn't realize wait = 1 guarantees ret is set */ 948ccd979bdSMark Fasheh unsigned long flags; 949ccd979bdSMark Fasheh 950ccd979bdSMark Fasheh mlog_entry_void(); 951ccd979bdSMark Fasheh 952ccd979bdSMark Fasheh ocfs2_init_mask_waiter(&mw); 953ccd979bdSMark Fasheh 954b80fc012SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) 955b80fc012SMark Fasheh lkm_flags |= LKM_VALBLK; 956b80fc012SMark Fasheh 957ccd979bdSMark Fasheh again: 958ccd979bdSMark Fasheh wait = 0; 959ccd979bdSMark Fasheh 960ccd979bdSMark Fasheh if (catch_signals && signal_pending(current)) { 961ccd979bdSMark Fasheh ret = -ERESTARTSYS; 962ccd979bdSMark Fasheh goto out; 963ccd979bdSMark Fasheh } 964ccd979bdSMark Fasheh 965ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 966ccd979bdSMark Fasheh 967ccd979bdSMark Fasheh mlog_bug_on_msg(lockres->l_flags & OCFS2_LOCK_FREEING, 968ccd979bdSMark Fasheh "Cluster lock called on freeing lockres %s! flags " 969ccd979bdSMark Fasheh "0x%lx\n", lockres->l_name, lockres->l_flags); 970ccd979bdSMark Fasheh 971ccd979bdSMark Fasheh /* We only compare against the currently granted level 972ccd979bdSMark Fasheh * here. If the lock is blocked waiting on a downconvert, 973ccd979bdSMark Fasheh * we'll get caught below. */ 974ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY && 975ccd979bdSMark Fasheh level > lockres->l_level) { 976ccd979bdSMark Fasheh /* is someone sitting in dlm_lock? If so, wait on 977ccd979bdSMark Fasheh * them. */ 978ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BUSY, 0); 979ccd979bdSMark Fasheh wait = 1; 980ccd979bdSMark Fasheh goto unlock; 981ccd979bdSMark Fasheh } 982ccd979bdSMark Fasheh 983ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 984ccd979bdSMark Fasheh /* lock has not been created yet. */ 985ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 986ccd979bdSMark Fasheh 987ccd979bdSMark Fasheh ret = ocfs2_lock_create(osb, lockres, LKM_NLMODE, 0); 988ccd979bdSMark Fasheh if (ret < 0) { 989ccd979bdSMark Fasheh mlog_errno(ret); 990ccd979bdSMark Fasheh goto out; 991ccd979bdSMark Fasheh } 992ccd979bdSMark Fasheh goto again; 993ccd979bdSMark Fasheh } 994ccd979bdSMark Fasheh 995ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED && 996ccd979bdSMark Fasheh !ocfs2_may_continue_on_blocked_lock(lockres, level)) { 997ccd979bdSMark Fasheh /* is the lock is currently blocked on behalf of 998ccd979bdSMark Fasheh * another node */ 999ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_BLOCKED, 0); 1000ccd979bdSMark Fasheh wait = 1; 1001ccd979bdSMark Fasheh goto unlock; 1002ccd979bdSMark Fasheh } 1003ccd979bdSMark Fasheh 1004ccd979bdSMark Fasheh if (level > lockres->l_level) { 1005ccd979bdSMark Fasheh if (lockres->l_action != OCFS2_AST_INVALID) 1006ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres %s has action %u pending\n", 1007ccd979bdSMark Fasheh lockres->l_name, lockres->l_action); 1008ccd979bdSMark Fasheh 1009ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_CONVERT; 1010ccd979bdSMark Fasheh lockres->l_requested = level; 1011ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 1012ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1013ccd979bdSMark Fasheh 1014ccd979bdSMark Fasheh BUG_ON(level == LKM_IVMODE); 1015ccd979bdSMark Fasheh BUG_ON(level == LKM_NLMODE); 1016ccd979bdSMark Fasheh 1017ccd979bdSMark Fasheh mlog(0, "lock %s, convert from %d to level = %d\n", 1018ccd979bdSMark Fasheh lockres->l_name, lockres->l_level, level); 1019ccd979bdSMark Fasheh 1020ccd979bdSMark Fasheh /* call dlm_lock to upgrade lock now */ 1021ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 1022ccd979bdSMark Fasheh level, 1023ccd979bdSMark Fasheh &lockres->l_lksb, 1024b80fc012SMark Fasheh lkm_flags|LKM_CONVERT, 1025ccd979bdSMark Fasheh lockres->l_name, 1026f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 1027e92d57dfSMark Fasheh ocfs2_locking_ast, 1028ccd979bdSMark Fasheh lockres, 1029aa2623adSMark Fasheh ocfs2_blocking_ast); 1030ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 1031ccd979bdSMark Fasheh if ((lkm_flags & LKM_NOQUEUE) && 1032ccd979bdSMark Fasheh (status == DLM_NOTQUEUED)) 1033ccd979bdSMark Fasheh ret = -EAGAIN; 1034ccd979bdSMark Fasheh else { 1035ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, 1036ccd979bdSMark Fasheh lockres); 1037ccd979bdSMark Fasheh ret = -EINVAL; 1038ccd979bdSMark Fasheh } 1039ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 1040ccd979bdSMark Fasheh goto out; 1041ccd979bdSMark Fasheh } 1042ccd979bdSMark Fasheh 1043ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmlock\n", 1044ccd979bdSMark Fasheh lockres->l_name); 1045ccd979bdSMark Fasheh 1046ccd979bdSMark Fasheh /* At this point we've gone inside the dlm and need to 1047ccd979bdSMark Fasheh * complete our work regardless. */ 1048ccd979bdSMark Fasheh catch_signals = 0; 1049ccd979bdSMark Fasheh 1050ccd979bdSMark Fasheh /* wait for busy to clear and carry on */ 1051ccd979bdSMark Fasheh goto again; 1052ccd979bdSMark Fasheh } 1053ccd979bdSMark Fasheh 1054ccd979bdSMark Fasheh /* Ok, if we get here then we're good to go. */ 1055ccd979bdSMark Fasheh ocfs2_inc_holders(lockres, level); 1056ccd979bdSMark Fasheh 1057ccd979bdSMark Fasheh ret = 0; 1058ccd979bdSMark Fasheh unlock: 1059ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1060ccd979bdSMark Fasheh out: 1061ccd979bdSMark Fasheh /* 1062ccd979bdSMark Fasheh * This is helping work around a lock inversion between the page lock 1063ccd979bdSMark Fasheh * and dlm locks. One path holds the page lock while calling aops 1064ccd979bdSMark Fasheh * which block acquiring dlm locks. The voting thread holds dlm 1065ccd979bdSMark Fasheh * locks while acquiring page locks while down converting data locks. 1066ccd979bdSMark Fasheh * This block is helping an aop path notice the inversion and back 1067ccd979bdSMark Fasheh * off to unlock its page lock before trying the dlm lock again. 1068ccd979bdSMark Fasheh */ 1069ccd979bdSMark Fasheh if (wait && arg_flags & OCFS2_LOCK_NONBLOCK && 1070ccd979bdSMark Fasheh mw.mw_mask & (OCFS2_LOCK_BUSY|OCFS2_LOCK_BLOCKED)) { 1071ccd979bdSMark Fasheh wait = 0; 1072ccd979bdSMark Fasheh if (lockres_remove_mask_waiter(lockres, &mw)) 1073ccd979bdSMark Fasheh ret = -EAGAIN; 1074ccd979bdSMark Fasheh else 1075ccd979bdSMark Fasheh goto again; 1076ccd979bdSMark Fasheh } 1077ccd979bdSMark Fasheh if (wait) { 1078ccd979bdSMark Fasheh ret = ocfs2_wait_for_mask(&mw); 1079ccd979bdSMark Fasheh if (ret == 0) 1080ccd979bdSMark Fasheh goto again; 1081ccd979bdSMark Fasheh mlog_errno(ret); 1082ccd979bdSMark Fasheh } 1083ccd979bdSMark Fasheh 1084ccd979bdSMark Fasheh mlog_exit(ret); 1085ccd979bdSMark Fasheh return ret; 1086ccd979bdSMark Fasheh } 1087ccd979bdSMark Fasheh 1088ccd979bdSMark Fasheh static void ocfs2_cluster_unlock(struct ocfs2_super *osb, 1089ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 1090ccd979bdSMark Fasheh int level) 1091ccd979bdSMark Fasheh { 1092ccd979bdSMark Fasheh unsigned long flags; 1093ccd979bdSMark Fasheh 1094ccd979bdSMark Fasheh mlog_entry_void(); 1095ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1096ccd979bdSMark Fasheh ocfs2_dec_holders(lockres, level); 1097ccd979bdSMark Fasheh ocfs2_vote_on_unlock(osb, lockres); 1098ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1099ccd979bdSMark Fasheh mlog_exit_void(); 1100ccd979bdSMark Fasheh } 1101ccd979bdSMark Fasheh 1102da66116eSAdrian Bunk static int ocfs2_create_new_lock(struct ocfs2_super *osb, 1103d680efe9SMark Fasheh struct ocfs2_lock_res *lockres, 110424c19ef4SMark Fasheh int ex, 110524c19ef4SMark Fasheh int local) 1106ccd979bdSMark Fasheh { 1107d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1108ccd979bdSMark Fasheh unsigned long flags; 110924c19ef4SMark Fasheh int lkm_flags = local ? LKM_LOCAL : 0; 1110ccd979bdSMark Fasheh 1111ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1112ccd979bdSMark Fasheh BUG_ON(lockres->l_flags & OCFS2_LOCK_ATTACHED); 1113ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_LOCAL); 1114ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1115ccd979bdSMark Fasheh 111624c19ef4SMark Fasheh return ocfs2_lock_create(osb, lockres, level, lkm_flags); 1117ccd979bdSMark Fasheh } 1118ccd979bdSMark Fasheh 1119ccd979bdSMark Fasheh /* Grants us an EX lock on the data and metadata resources, skipping 1120ccd979bdSMark Fasheh * the normal cluster directory lookup. Use this ONLY on newly created 1121ccd979bdSMark Fasheh * inodes which other nodes can't possibly see, and which haven't been 1122ccd979bdSMark Fasheh * hashed in the inode hash yet. This can give us a good performance 1123ccd979bdSMark Fasheh * increase as it'll skip the network broadcast normally associated 1124ccd979bdSMark Fasheh * with creating a new lock resource. */ 1125ccd979bdSMark Fasheh int ocfs2_create_new_inode_locks(struct inode *inode) 1126ccd979bdSMark Fasheh { 1127ccd979bdSMark Fasheh int ret; 1128d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1129ccd979bdSMark Fasheh 1130ccd979bdSMark Fasheh BUG_ON(!inode); 1131ccd979bdSMark Fasheh BUG_ON(!ocfs2_inode_is_new(inode)); 1132ccd979bdSMark Fasheh 1133ccd979bdSMark Fasheh mlog_entry_void(); 1134ccd979bdSMark Fasheh 1135b0697053SMark Fasheh mlog(0, "Inode %llu\n", (unsigned long long)OCFS2_I(inode)->ip_blkno); 1136ccd979bdSMark Fasheh 1137ccd979bdSMark Fasheh /* NOTE: That we don't increment any of the holder counts, nor 1138ccd979bdSMark Fasheh * do we add anything to a journal handle. Since this is 1139ccd979bdSMark Fasheh * supposed to be a new inode which the cluster doesn't know 1140ccd979bdSMark Fasheh * about yet, there is no need to. As far as the LVB handling 1141ccd979bdSMark Fasheh * is concerned, this is basically like acquiring an EX lock 1142ccd979bdSMark Fasheh * on a resource which has an invalid one -- we'll set it 1143ccd979bdSMark Fasheh * valid when we release the EX. */ 1144ccd979bdSMark Fasheh 114524c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_rw_lockres, 1, 1); 1146ccd979bdSMark Fasheh if (ret) { 1147ccd979bdSMark Fasheh mlog_errno(ret); 1148ccd979bdSMark Fasheh goto bail; 1149ccd979bdSMark Fasheh } 1150ccd979bdSMark Fasheh 115124c19ef4SMark Fasheh /* 115224c19ef4SMark Fasheh * We don't want to use LKM_LOCAL on a meta data lock as they 115324c19ef4SMark Fasheh * don't use a generation in their lock names. 115424c19ef4SMark Fasheh */ 115524c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_meta_lockres, 1, 0); 1156ccd979bdSMark Fasheh if (ret) { 1157ccd979bdSMark Fasheh mlog_errno(ret); 1158ccd979bdSMark Fasheh goto bail; 1159ccd979bdSMark Fasheh } 1160ccd979bdSMark Fasheh 116124c19ef4SMark Fasheh ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_data_lockres, 1, 1); 1162ccd979bdSMark Fasheh if (ret) { 1163ccd979bdSMark Fasheh mlog_errno(ret); 1164ccd979bdSMark Fasheh goto bail; 1165ccd979bdSMark Fasheh } 1166ccd979bdSMark Fasheh 116750008630STiger Yang ret = ocfs2_create_new_lock(osb, &OCFS2_I(inode)->ip_open_lockres, 0, 0); 116850008630STiger Yang if (ret) { 116950008630STiger Yang mlog_errno(ret); 117050008630STiger Yang goto bail; 117150008630STiger Yang } 117250008630STiger Yang 1173ccd979bdSMark Fasheh bail: 1174ccd979bdSMark Fasheh mlog_exit(ret); 1175ccd979bdSMark Fasheh return ret; 1176ccd979bdSMark Fasheh } 1177ccd979bdSMark Fasheh 1178ccd979bdSMark Fasheh int ocfs2_rw_lock(struct inode *inode, int write) 1179ccd979bdSMark Fasheh { 1180ccd979bdSMark Fasheh int status, level; 1181ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres; 1182c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1183ccd979bdSMark Fasheh 1184ccd979bdSMark Fasheh BUG_ON(!inode); 1185ccd979bdSMark Fasheh 1186ccd979bdSMark Fasheh mlog_entry_void(); 1187ccd979bdSMark Fasheh 1188b0697053SMark Fasheh mlog(0, "inode %llu take %s RW lock\n", 1189b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1190ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1191ccd979bdSMark Fasheh 1192c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1193c271c5c2SSunil Mushran return 0; 1194c271c5c2SSunil Mushran 1195ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_rw_lockres; 1196ccd979bdSMark Fasheh 1197ccd979bdSMark Fasheh level = write ? LKM_EXMODE : LKM_PRMODE; 1198ccd979bdSMark Fasheh 1199ccd979bdSMark Fasheh status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 0, 1200ccd979bdSMark Fasheh 0); 1201ccd979bdSMark Fasheh if (status < 0) 1202ccd979bdSMark Fasheh mlog_errno(status); 1203ccd979bdSMark Fasheh 1204ccd979bdSMark Fasheh mlog_exit(status); 1205ccd979bdSMark Fasheh return status; 1206ccd979bdSMark Fasheh } 1207ccd979bdSMark Fasheh 1208ccd979bdSMark Fasheh void ocfs2_rw_unlock(struct inode *inode, int write) 1209ccd979bdSMark Fasheh { 1210ccd979bdSMark Fasheh int level = write ? LKM_EXMODE : LKM_PRMODE; 1211ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_rw_lockres; 1212c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1213ccd979bdSMark Fasheh 1214ccd979bdSMark Fasheh mlog_entry_void(); 1215ccd979bdSMark Fasheh 1216b0697053SMark Fasheh mlog(0, "inode %llu drop %s RW lock\n", 1217b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1218ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1219ccd979bdSMark Fasheh 1220c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 1221ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1222ccd979bdSMark Fasheh 1223ccd979bdSMark Fasheh mlog_exit_void(); 1224ccd979bdSMark Fasheh } 1225ccd979bdSMark Fasheh 122650008630STiger Yang /* 122750008630STiger Yang * ocfs2_open_lock always get PR mode lock. 122850008630STiger Yang */ 122950008630STiger Yang int ocfs2_open_lock(struct inode *inode) 123050008630STiger Yang { 123150008630STiger Yang int status = 0; 123250008630STiger Yang struct ocfs2_lock_res *lockres; 123350008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 123450008630STiger Yang 123550008630STiger Yang BUG_ON(!inode); 123650008630STiger Yang 123750008630STiger Yang mlog_entry_void(); 123850008630STiger Yang 123950008630STiger Yang mlog(0, "inode %llu take PRMODE open lock\n", 124050008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno); 124150008630STiger Yang 124250008630STiger Yang if (ocfs2_mount_local(osb)) 124350008630STiger Yang goto out; 124450008630STiger Yang 124550008630STiger Yang lockres = &OCFS2_I(inode)->ip_open_lockres; 124650008630STiger Yang 124750008630STiger Yang status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, 124850008630STiger Yang LKM_PRMODE, 0, 0); 124950008630STiger Yang if (status < 0) 125050008630STiger Yang mlog_errno(status); 125150008630STiger Yang 125250008630STiger Yang out: 125350008630STiger Yang mlog_exit(status); 125450008630STiger Yang return status; 125550008630STiger Yang } 125650008630STiger Yang 125750008630STiger Yang int ocfs2_try_open_lock(struct inode *inode, int write) 125850008630STiger Yang { 125950008630STiger Yang int status = 0, level; 126050008630STiger Yang struct ocfs2_lock_res *lockres; 126150008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 126250008630STiger Yang 126350008630STiger Yang BUG_ON(!inode); 126450008630STiger Yang 126550008630STiger Yang mlog_entry_void(); 126650008630STiger Yang 126750008630STiger Yang mlog(0, "inode %llu try to take %s open lock\n", 126850008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno, 126950008630STiger Yang write ? "EXMODE" : "PRMODE"); 127050008630STiger Yang 127150008630STiger Yang if (ocfs2_mount_local(osb)) 127250008630STiger Yang goto out; 127350008630STiger Yang 127450008630STiger Yang lockres = &OCFS2_I(inode)->ip_open_lockres; 127550008630STiger Yang 127650008630STiger Yang level = write ? LKM_EXMODE : LKM_PRMODE; 127750008630STiger Yang 127850008630STiger Yang /* 127950008630STiger Yang * The file system may already holding a PRMODE/EXMODE open lock. 128050008630STiger Yang * Since we pass LKM_NOQUEUE, the request won't block waiting on 128150008630STiger Yang * other nodes and the -EAGAIN will indicate to the caller that 128250008630STiger Yang * this inode is still in use. 128350008630STiger Yang */ 128450008630STiger Yang status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, 128550008630STiger Yang level, LKM_NOQUEUE, 0); 128650008630STiger Yang 128750008630STiger Yang out: 128850008630STiger Yang mlog_exit(status); 128950008630STiger Yang return status; 129050008630STiger Yang } 129150008630STiger Yang 129250008630STiger Yang /* 129350008630STiger Yang * ocfs2_open_unlock unlock PR and EX mode open locks. 129450008630STiger Yang */ 129550008630STiger Yang void ocfs2_open_unlock(struct inode *inode) 129650008630STiger Yang { 129750008630STiger Yang struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_open_lockres; 129850008630STiger Yang struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 129950008630STiger Yang 130050008630STiger Yang mlog_entry_void(); 130150008630STiger Yang 130250008630STiger Yang mlog(0, "inode %llu drop open lock\n", 130350008630STiger Yang (unsigned long long)OCFS2_I(inode)->ip_blkno); 130450008630STiger Yang 130550008630STiger Yang if (ocfs2_mount_local(osb)) 130650008630STiger Yang goto out; 130750008630STiger Yang 130850008630STiger Yang if(lockres->l_ro_holders) 130950008630STiger Yang ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, 131050008630STiger Yang LKM_PRMODE); 131150008630STiger Yang if(lockres->l_ex_holders) 131250008630STiger Yang ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, 131350008630STiger Yang LKM_EXMODE); 131450008630STiger Yang 131550008630STiger Yang out: 131650008630STiger Yang mlog_exit_void(); 131750008630STiger Yang } 131850008630STiger Yang 1319ccd979bdSMark Fasheh int ocfs2_data_lock_full(struct inode *inode, 1320ccd979bdSMark Fasheh int write, 1321ccd979bdSMark Fasheh int arg_flags) 1322ccd979bdSMark Fasheh { 1323ccd979bdSMark Fasheh int status = 0, level; 1324ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres; 1325c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1326ccd979bdSMark Fasheh 1327ccd979bdSMark Fasheh BUG_ON(!inode); 1328ccd979bdSMark Fasheh 1329ccd979bdSMark Fasheh mlog_entry_void(); 1330ccd979bdSMark Fasheh 1331b0697053SMark Fasheh mlog(0, "inode %llu take %s DATA lock\n", 1332b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1333ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1334ccd979bdSMark Fasheh 1335ccd979bdSMark Fasheh /* We'll allow faking a readonly data lock for 1336ccd979bdSMark Fasheh * rodevices. */ 1337ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb))) { 1338ccd979bdSMark Fasheh if (write) { 1339ccd979bdSMark Fasheh status = -EROFS; 1340ccd979bdSMark Fasheh mlog_errno(status); 1341ccd979bdSMark Fasheh } 1342ccd979bdSMark Fasheh goto out; 1343ccd979bdSMark Fasheh } 1344ccd979bdSMark Fasheh 1345c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1346c271c5c2SSunil Mushran goto out; 1347c271c5c2SSunil Mushran 1348ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_data_lockres; 1349ccd979bdSMark Fasheh 1350ccd979bdSMark Fasheh level = write ? LKM_EXMODE : LKM_PRMODE; 1351ccd979bdSMark Fasheh 1352ccd979bdSMark Fasheh status = ocfs2_cluster_lock(OCFS2_SB(inode->i_sb), lockres, level, 1353ccd979bdSMark Fasheh 0, arg_flags); 1354ccd979bdSMark Fasheh if (status < 0 && status != -EAGAIN) 1355ccd979bdSMark Fasheh mlog_errno(status); 1356ccd979bdSMark Fasheh 1357ccd979bdSMark Fasheh out: 1358ccd979bdSMark Fasheh mlog_exit(status); 1359ccd979bdSMark Fasheh return status; 1360ccd979bdSMark Fasheh } 1361ccd979bdSMark Fasheh 1362ccd979bdSMark Fasheh /* see ocfs2_meta_lock_with_page() */ 1363ccd979bdSMark Fasheh int ocfs2_data_lock_with_page(struct inode *inode, 1364ccd979bdSMark Fasheh int write, 1365ccd979bdSMark Fasheh struct page *page) 1366ccd979bdSMark Fasheh { 1367ccd979bdSMark Fasheh int ret; 1368ccd979bdSMark Fasheh 1369ccd979bdSMark Fasheh ret = ocfs2_data_lock_full(inode, write, OCFS2_LOCK_NONBLOCK); 1370ccd979bdSMark Fasheh if (ret == -EAGAIN) { 1371ccd979bdSMark Fasheh unlock_page(page); 1372ccd979bdSMark Fasheh if (ocfs2_data_lock(inode, write) == 0) 1373ccd979bdSMark Fasheh ocfs2_data_unlock(inode, write); 1374ccd979bdSMark Fasheh ret = AOP_TRUNCATED_PAGE; 1375ccd979bdSMark Fasheh } 1376ccd979bdSMark Fasheh 1377ccd979bdSMark Fasheh return ret; 1378ccd979bdSMark Fasheh } 1379ccd979bdSMark Fasheh 1380ccd979bdSMark Fasheh static void ocfs2_vote_on_unlock(struct ocfs2_super *osb, 1381ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 1382ccd979bdSMark Fasheh { 1383ccd979bdSMark Fasheh int kick = 0; 1384ccd979bdSMark Fasheh 1385ccd979bdSMark Fasheh mlog_entry_void(); 1386ccd979bdSMark Fasheh 1387ccd979bdSMark Fasheh /* If we know that another node is waiting on our lock, kick 1388ccd979bdSMark Fasheh * the vote thread * pre-emptively when we reach a release 1389ccd979bdSMark Fasheh * condition. */ 1390ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED) { 1391ccd979bdSMark Fasheh switch(lockres->l_blocking) { 1392ccd979bdSMark Fasheh case LKM_EXMODE: 1393ccd979bdSMark Fasheh if (!lockres->l_ex_holders && !lockres->l_ro_holders) 1394ccd979bdSMark Fasheh kick = 1; 1395ccd979bdSMark Fasheh break; 1396ccd979bdSMark Fasheh case LKM_PRMODE: 1397ccd979bdSMark Fasheh if (!lockres->l_ex_holders) 1398ccd979bdSMark Fasheh kick = 1; 1399ccd979bdSMark Fasheh break; 1400ccd979bdSMark Fasheh default: 1401ccd979bdSMark Fasheh BUG(); 1402ccd979bdSMark Fasheh } 1403ccd979bdSMark Fasheh } 1404ccd979bdSMark Fasheh 1405ccd979bdSMark Fasheh if (kick) 1406ccd979bdSMark Fasheh ocfs2_kick_vote_thread(osb); 1407ccd979bdSMark Fasheh 1408ccd979bdSMark Fasheh mlog_exit_void(); 1409ccd979bdSMark Fasheh } 1410ccd979bdSMark Fasheh 1411ccd979bdSMark Fasheh void ocfs2_data_unlock(struct inode *inode, 1412ccd979bdSMark Fasheh int write) 1413ccd979bdSMark Fasheh { 1414ccd979bdSMark Fasheh int level = write ? LKM_EXMODE : LKM_PRMODE; 1415ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_data_lockres; 1416c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1417ccd979bdSMark Fasheh 1418ccd979bdSMark Fasheh mlog_entry_void(); 1419ccd979bdSMark Fasheh 1420b0697053SMark Fasheh mlog(0, "inode %llu drop %s DATA lock\n", 1421b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1422ccd979bdSMark Fasheh write ? "EXMODE" : "PRMODE"); 1423ccd979bdSMark Fasheh 1424c271c5c2SSunil Mushran if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && 1425c271c5c2SSunil Mushran !ocfs2_mount_local(osb)) 1426ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1427ccd979bdSMark Fasheh 1428ccd979bdSMark Fasheh mlog_exit_void(); 1429ccd979bdSMark Fasheh } 1430ccd979bdSMark Fasheh 1431ccd979bdSMark Fasheh #define OCFS2_SEC_BITS 34 1432ccd979bdSMark Fasheh #define OCFS2_SEC_SHIFT (64 - 34) 1433ccd979bdSMark Fasheh #define OCFS2_NSEC_MASK ((1ULL << OCFS2_SEC_SHIFT) - 1) 1434ccd979bdSMark Fasheh 1435ccd979bdSMark Fasheh /* LVB only has room for 64 bits of time here so we pack it for 1436ccd979bdSMark Fasheh * now. */ 1437ccd979bdSMark Fasheh static u64 ocfs2_pack_timespec(struct timespec *spec) 1438ccd979bdSMark Fasheh { 1439ccd979bdSMark Fasheh u64 res; 1440ccd979bdSMark Fasheh u64 sec = spec->tv_sec; 1441ccd979bdSMark Fasheh u32 nsec = spec->tv_nsec; 1442ccd979bdSMark Fasheh 1443ccd979bdSMark Fasheh res = (sec << OCFS2_SEC_SHIFT) | (nsec & OCFS2_NSEC_MASK); 1444ccd979bdSMark Fasheh 1445ccd979bdSMark Fasheh return res; 1446ccd979bdSMark Fasheh } 1447ccd979bdSMark Fasheh 1448ccd979bdSMark Fasheh /* Call this with the lockres locked. I am reasonably sure we don't 1449ccd979bdSMark Fasheh * need ip_lock in this function as anyone who would be changing those 1450ccd979bdSMark Fasheh * values is supposed to be blocked in ocfs2_meta_lock right now. */ 1451ccd979bdSMark Fasheh static void __ocfs2_stuff_meta_lvb(struct inode *inode) 1452ccd979bdSMark Fasheh { 1453ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1454ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1455ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb; 1456ccd979bdSMark Fasheh 1457ccd979bdSMark Fasheh mlog_entry_void(); 1458ccd979bdSMark Fasheh 1459ccd979bdSMark Fasheh lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1460ccd979bdSMark Fasheh 146124c19ef4SMark Fasheh /* 146224c19ef4SMark Fasheh * Invalidate the LVB of a deleted inode - this way other 146324c19ef4SMark Fasheh * nodes are forced to go to disk and discover the new inode 146424c19ef4SMark Fasheh * status. 146524c19ef4SMark Fasheh */ 146624c19ef4SMark Fasheh if (oi->ip_flags & OCFS2_INODE_DELETED) { 146724c19ef4SMark Fasheh lvb->lvb_version = 0; 146824c19ef4SMark Fasheh goto out; 146924c19ef4SMark Fasheh } 147024c19ef4SMark Fasheh 14714d3b83f7SMark Fasheh lvb->lvb_version = OCFS2_LVB_VERSION; 1472ccd979bdSMark Fasheh lvb->lvb_isize = cpu_to_be64(i_size_read(inode)); 1473ccd979bdSMark Fasheh lvb->lvb_iclusters = cpu_to_be32(oi->ip_clusters); 1474ccd979bdSMark Fasheh lvb->lvb_iuid = cpu_to_be32(inode->i_uid); 1475ccd979bdSMark Fasheh lvb->lvb_igid = cpu_to_be32(inode->i_gid); 1476ccd979bdSMark Fasheh lvb->lvb_imode = cpu_to_be16(inode->i_mode); 1477ccd979bdSMark Fasheh lvb->lvb_inlink = cpu_to_be16(inode->i_nlink); 1478ccd979bdSMark Fasheh lvb->lvb_iatime_packed = 1479ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_atime)); 1480ccd979bdSMark Fasheh lvb->lvb_ictime_packed = 1481ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_ctime)); 1482ccd979bdSMark Fasheh lvb->lvb_imtime_packed = 1483ccd979bdSMark Fasheh cpu_to_be64(ocfs2_pack_timespec(&inode->i_mtime)); 1484ca4d147eSHerbert Poetzl lvb->lvb_iattr = cpu_to_be32(oi->ip_attr); 148515b1e36bSMark Fasheh lvb->lvb_idynfeatures = cpu_to_be16(oi->ip_dyn_features); 1486f9e2d82eSMark Fasheh lvb->lvb_igeneration = cpu_to_be32(inode->i_generation); 1487ccd979bdSMark Fasheh 148824c19ef4SMark Fasheh out: 1489ccd979bdSMark Fasheh mlog_meta_lvb(0, lockres); 1490ccd979bdSMark Fasheh 1491ccd979bdSMark Fasheh mlog_exit_void(); 1492ccd979bdSMark Fasheh } 1493ccd979bdSMark Fasheh 1494ccd979bdSMark Fasheh static void ocfs2_unpack_timespec(struct timespec *spec, 1495ccd979bdSMark Fasheh u64 packed_time) 1496ccd979bdSMark Fasheh { 1497ccd979bdSMark Fasheh spec->tv_sec = packed_time >> OCFS2_SEC_SHIFT; 1498ccd979bdSMark Fasheh spec->tv_nsec = packed_time & OCFS2_NSEC_MASK; 1499ccd979bdSMark Fasheh } 1500ccd979bdSMark Fasheh 1501ccd979bdSMark Fasheh static void ocfs2_refresh_inode_from_lvb(struct inode *inode) 1502ccd979bdSMark Fasheh { 1503ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1504ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1505ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb; 1506ccd979bdSMark Fasheh 1507ccd979bdSMark Fasheh mlog_entry_void(); 1508ccd979bdSMark Fasheh 1509ccd979bdSMark Fasheh mlog_meta_lvb(0, lockres); 1510ccd979bdSMark Fasheh 1511ccd979bdSMark Fasheh lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1512ccd979bdSMark Fasheh 1513ccd979bdSMark Fasheh /* We're safe here without the lockres lock... */ 1514ccd979bdSMark Fasheh spin_lock(&oi->ip_lock); 1515ccd979bdSMark Fasheh oi->ip_clusters = be32_to_cpu(lvb->lvb_iclusters); 1516ccd979bdSMark Fasheh i_size_write(inode, be64_to_cpu(lvb->lvb_isize)); 1517ccd979bdSMark Fasheh 1518ca4d147eSHerbert Poetzl oi->ip_attr = be32_to_cpu(lvb->lvb_iattr); 151915b1e36bSMark Fasheh oi->ip_dyn_features = be16_to_cpu(lvb->lvb_idynfeatures); 1520ca4d147eSHerbert Poetzl ocfs2_set_inode_flags(inode); 1521ca4d147eSHerbert Poetzl 1522ccd979bdSMark Fasheh /* fast-symlinks are a special case */ 1523ccd979bdSMark Fasheh if (S_ISLNK(inode->i_mode) && !oi->ip_clusters) 1524ccd979bdSMark Fasheh inode->i_blocks = 0; 1525ccd979bdSMark Fasheh else 15268110b073SMark Fasheh inode->i_blocks = ocfs2_inode_sector_count(inode); 1527ccd979bdSMark Fasheh 1528ccd979bdSMark Fasheh inode->i_uid = be32_to_cpu(lvb->lvb_iuid); 1529ccd979bdSMark Fasheh inode->i_gid = be32_to_cpu(lvb->lvb_igid); 1530ccd979bdSMark Fasheh inode->i_mode = be16_to_cpu(lvb->lvb_imode); 1531ccd979bdSMark Fasheh inode->i_nlink = be16_to_cpu(lvb->lvb_inlink); 1532ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_atime, 1533ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_iatime_packed)); 1534ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_mtime, 1535ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_imtime_packed)); 1536ccd979bdSMark Fasheh ocfs2_unpack_timespec(&inode->i_ctime, 1537ccd979bdSMark Fasheh be64_to_cpu(lvb->lvb_ictime_packed)); 1538ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1539ccd979bdSMark Fasheh 1540ccd979bdSMark Fasheh mlog_exit_void(); 1541ccd979bdSMark Fasheh } 1542ccd979bdSMark Fasheh 1543f9e2d82eSMark Fasheh static inline int ocfs2_meta_lvb_is_trustable(struct inode *inode, 1544f9e2d82eSMark Fasheh struct ocfs2_lock_res *lockres) 1545ccd979bdSMark Fasheh { 1546ccd979bdSMark Fasheh struct ocfs2_meta_lvb *lvb = (struct ocfs2_meta_lvb *) lockres->l_lksb.lvb; 1547ccd979bdSMark Fasheh 1548f9e2d82eSMark Fasheh if (lvb->lvb_version == OCFS2_LVB_VERSION 1549f9e2d82eSMark Fasheh && be32_to_cpu(lvb->lvb_igeneration) == inode->i_generation) 1550ccd979bdSMark Fasheh return 1; 1551ccd979bdSMark Fasheh return 0; 1552ccd979bdSMark Fasheh } 1553ccd979bdSMark Fasheh 1554ccd979bdSMark Fasheh /* Determine whether a lock resource needs to be refreshed, and 1555ccd979bdSMark Fasheh * arbitrate who gets to refresh it. 1556ccd979bdSMark Fasheh * 1557ccd979bdSMark Fasheh * 0 means no refresh needed. 1558ccd979bdSMark Fasheh * 1559ccd979bdSMark Fasheh * > 0 means you need to refresh this and you MUST call 1560ccd979bdSMark Fasheh * ocfs2_complete_lock_res_refresh afterwards. */ 1561ccd979bdSMark Fasheh static int ocfs2_should_refresh_lock_res(struct ocfs2_lock_res *lockres) 1562ccd979bdSMark Fasheh { 1563ccd979bdSMark Fasheh unsigned long flags; 1564ccd979bdSMark Fasheh int status = 0; 1565ccd979bdSMark Fasheh 1566ccd979bdSMark Fasheh mlog_entry_void(); 1567ccd979bdSMark Fasheh 1568ccd979bdSMark Fasheh refresh_check: 1569ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1570ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) { 1571ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1572ccd979bdSMark Fasheh goto bail; 1573ccd979bdSMark Fasheh } 1574ccd979bdSMark Fasheh 1575ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_REFRESHING) { 1576ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1577ccd979bdSMark Fasheh 1578ccd979bdSMark Fasheh ocfs2_wait_on_refreshing_lock(lockres); 1579ccd979bdSMark Fasheh goto refresh_check; 1580ccd979bdSMark Fasheh } 1581ccd979bdSMark Fasheh 1582ccd979bdSMark Fasheh /* Ok, I'll be the one to refresh this lock. */ 1583ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_REFRESHING); 1584ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1585ccd979bdSMark Fasheh 1586ccd979bdSMark Fasheh status = 1; 1587ccd979bdSMark Fasheh bail: 1588ccd979bdSMark Fasheh mlog_exit(status); 1589ccd979bdSMark Fasheh return status; 1590ccd979bdSMark Fasheh } 1591ccd979bdSMark Fasheh 1592ccd979bdSMark Fasheh /* If status is non zero, I'll mark it as not being in refresh 1593ccd979bdSMark Fasheh * anymroe, but i won't clear the needs refresh flag. */ 1594ccd979bdSMark Fasheh static inline void ocfs2_complete_lock_res_refresh(struct ocfs2_lock_res *lockres, 1595ccd979bdSMark Fasheh int status) 1596ccd979bdSMark Fasheh { 1597ccd979bdSMark Fasheh unsigned long flags; 1598ccd979bdSMark Fasheh mlog_entry_void(); 1599ccd979bdSMark Fasheh 1600ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 1601ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_REFRESHING); 1602ccd979bdSMark Fasheh if (!status) 1603ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_NEEDS_REFRESH); 1604ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 1605ccd979bdSMark Fasheh 1606ccd979bdSMark Fasheh wake_up(&lockres->l_event); 1607ccd979bdSMark Fasheh 1608ccd979bdSMark Fasheh mlog_exit_void(); 1609ccd979bdSMark Fasheh } 1610ccd979bdSMark Fasheh 1611ccd979bdSMark Fasheh /* may or may not return a bh if it went to disk. */ 1612ccd979bdSMark Fasheh static int ocfs2_meta_lock_update(struct inode *inode, 1613ccd979bdSMark Fasheh struct buffer_head **bh) 1614ccd979bdSMark Fasheh { 1615ccd979bdSMark Fasheh int status = 0; 1616ccd979bdSMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(inode); 1617be9e986bSMark Fasheh struct ocfs2_lock_res *lockres = &oi->ip_meta_lockres; 1618ccd979bdSMark Fasheh struct ocfs2_dinode *fe; 1619c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1620ccd979bdSMark Fasheh 1621ccd979bdSMark Fasheh mlog_entry_void(); 1622ccd979bdSMark Fasheh 1623be9e986bSMark Fasheh if (ocfs2_mount_local(osb)) 1624be9e986bSMark Fasheh goto bail; 1625be9e986bSMark Fasheh 1626ccd979bdSMark Fasheh spin_lock(&oi->ip_lock); 1627ccd979bdSMark Fasheh if (oi->ip_flags & OCFS2_INODE_DELETED) { 1628b0697053SMark Fasheh mlog(0, "Orphaned inode %llu was deleted while we " 1629ccd979bdSMark Fasheh "were waiting on a lock. ip_flags = 0x%x\n", 1630b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, oi->ip_flags); 1631ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1632ccd979bdSMark Fasheh status = -ENOENT; 1633ccd979bdSMark Fasheh goto bail; 1634ccd979bdSMark Fasheh } 1635ccd979bdSMark Fasheh spin_unlock(&oi->ip_lock); 1636ccd979bdSMark Fasheh 1637ccd979bdSMark Fasheh if (!ocfs2_should_refresh_lock_res(lockres)) 1638ccd979bdSMark Fasheh goto bail; 1639ccd979bdSMark Fasheh 1640ccd979bdSMark Fasheh /* This will discard any caching information we might have had 1641ccd979bdSMark Fasheh * for the inode metadata. */ 1642ccd979bdSMark Fasheh ocfs2_metadata_cache_purge(inode); 1643ccd979bdSMark Fasheh 164483418978SMark Fasheh ocfs2_extent_map_trunc(inode, 0); 164583418978SMark Fasheh 1646be9e986bSMark Fasheh if (ocfs2_meta_lvb_is_trustable(inode, lockres)) { 1647b0697053SMark Fasheh mlog(0, "Trusting LVB on inode %llu\n", 1648b0697053SMark Fasheh (unsigned long long)oi->ip_blkno); 1649ccd979bdSMark Fasheh ocfs2_refresh_inode_from_lvb(inode); 1650ccd979bdSMark Fasheh } else { 1651ccd979bdSMark Fasheh /* Boo, we have to go to disk. */ 1652ccd979bdSMark Fasheh /* read bh, cast, ocfs2_refresh_inode */ 1653ccd979bdSMark Fasheh status = ocfs2_read_block(OCFS2_SB(inode->i_sb), oi->ip_blkno, 1654ccd979bdSMark Fasheh bh, OCFS2_BH_CACHED, inode); 1655ccd979bdSMark Fasheh if (status < 0) { 1656ccd979bdSMark Fasheh mlog_errno(status); 1657ccd979bdSMark Fasheh goto bail_refresh; 1658ccd979bdSMark Fasheh } 1659ccd979bdSMark Fasheh fe = (struct ocfs2_dinode *) (*bh)->b_data; 1660ccd979bdSMark Fasheh 1661ccd979bdSMark Fasheh /* This is a good chance to make sure we're not 1662ccd979bdSMark Fasheh * locking an invalid object. 1663ccd979bdSMark Fasheh * 1664ccd979bdSMark Fasheh * We bug on a stale inode here because we checked 1665ccd979bdSMark Fasheh * above whether it was wiped from disk. The wiping 1666ccd979bdSMark Fasheh * node provides a guarantee that we receive that 1667ccd979bdSMark Fasheh * message and can mark the inode before dropping any 1668ccd979bdSMark Fasheh * locks associated with it. */ 1669ccd979bdSMark Fasheh if (!OCFS2_IS_VALID_DINODE(fe)) { 1670ccd979bdSMark Fasheh OCFS2_RO_ON_INVALID_DINODE(inode->i_sb, fe); 1671ccd979bdSMark Fasheh status = -EIO; 1672ccd979bdSMark Fasheh goto bail_refresh; 1673ccd979bdSMark Fasheh } 1674ccd979bdSMark Fasheh mlog_bug_on_msg(inode->i_generation != 1675ccd979bdSMark Fasheh le32_to_cpu(fe->i_generation), 1676b0697053SMark Fasheh "Invalid dinode %llu disk generation: %u " 1677ccd979bdSMark Fasheh "inode->i_generation: %u\n", 1678b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, 1679b0697053SMark Fasheh le32_to_cpu(fe->i_generation), 1680ccd979bdSMark Fasheh inode->i_generation); 1681ccd979bdSMark Fasheh mlog_bug_on_msg(le64_to_cpu(fe->i_dtime) || 1682ccd979bdSMark Fasheh !(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)), 1683b0697053SMark Fasheh "Stale dinode %llu dtime: %llu flags: 0x%x\n", 1684b0697053SMark Fasheh (unsigned long long)oi->ip_blkno, 1685b0697053SMark Fasheh (unsigned long long)le64_to_cpu(fe->i_dtime), 1686ccd979bdSMark Fasheh le32_to_cpu(fe->i_flags)); 1687ccd979bdSMark Fasheh 1688ccd979bdSMark Fasheh ocfs2_refresh_inode(inode, fe); 1689ccd979bdSMark Fasheh } 1690ccd979bdSMark Fasheh 1691ccd979bdSMark Fasheh status = 0; 1692ccd979bdSMark Fasheh bail_refresh: 1693ccd979bdSMark Fasheh ocfs2_complete_lock_res_refresh(lockres, status); 1694ccd979bdSMark Fasheh bail: 1695ccd979bdSMark Fasheh mlog_exit(status); 1696ccd979bdSMark Fasheh return status; 1697ccd979bdSMark Fasheh } 1698ccd979bdSMark Fasheh 1699ccd979bdSMark Fasheh static int ocfs2_assign_bh(struct inode *inode, 1700ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1701ccd979bdSMark Fasheh struct buffer_head *passed_bh) 1702ccd979bdSMark Fasheh { 1703ccd979bdSMark Fasheh int status; 1704ccd979bdSMark Fasheh 1705ccd979bdSMark Fasheh if (passed_bh) { 1706ccd979bdSMark Fasheh /* Ok, the update went to disk for us, use the 1707ccd979bdSMark Fasheh * returned bh. */ 1708ccd979bdSMark Fasheh *ret_bh = passed_bh; 1709ccd979bdSMark Fasheh get_bh(*ret_bh); 1710ccd979bdSMark Fasheh 1711ccd979bdSMark Fasheh return 0; 1712ccd979bdSMark Fasheh } 1713ccd979bdSMark Fasheh 1714ccd979bdSMark Fasheh status = ocfs2_read_block(OCFS2_SB(inode->i_sb), 1715ccd979bdSMark Fasheh OCFS2_I(inode)->ip_blkno, 1716ccd979bdSMark Fasheh ret_bh, 1717ccd979bdSMark Fasheh OCFS2_BH_CACHED, 1718ccd979bdSMark Fasheh inode); 1719ccd979bdSMark Fasheh if (status < 0) 1720ccd979bdSMark Fasheh mlog_errno(status); 1721ccd979bdSMark Fasheh 1722ccd979bdSMark Fasheh return status; 1723ccd979bdSMark Fasheh } 1724ccd979bdSMark Fasheh 1725ccd979bdSMark Fasheh /* 1726ccd979bdSMark Fasheh * returns < 0 error if the callback will never be called, otherwise 1727ccd979bdSMark Fasheh * the result of the lock will be communicated via the callback. 1728ccd979bdSMark Fasheh */ 1729ccd979bdSMark Fasheh int ocfs2_meta_lock_full(struct inode *inode, 1730ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1731ccd979bdSMark Fasheh int ex, 1732ccd979bdSMark Fasheh int arg_flags) 1733ccd979bdSMark Fasheh { 1734ccd979bdSMark Fasheh int status, level, dlm_flags, acquired; 1735c271c5c2SSunil Mushran struct ocfs2_lock_res *lockres = NULL; 1736ccd979bdSMark Fasheh struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1737ccd979bdSMark Fasheh struct buffer_head *local_bh = NULL; 1738ccd979bdSMark Fasheh 1739ccd979bdSMark Fasheh BUG_ON(!inode); 1740ccd979bdSMark Fasheh 1741ccd979bdSMark Fasheh mlog_entry_void(); 1742ccd979bdSMark Fasheh 1743b0697053SMark Fasheh mlog(0, "inode %llu, take %s META lock\n", 1744b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1745ccd979bdSMark Fasheh ex ? "EXMODE" : "PRMODE"); 1746ccd979bdSMark Fasheh 1747ccd979bdSMark Fasheh status = 0; 1748ccd979bdSMark Fasheh acquired = 0; 1749ccd979bdSMark Fasheh /* We'll allow faking a readonly metadata lock for 1750ccd979bdSMark Fasheh * rodevices. */ 1751ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) { 1752ccd979bdSMark Fasheh if (ex) 1753ccd979bdSMark Fasheh status = -EROFS; 1754ccd979bdSMark Fasheh goto bail; 1755ccd979bdSMark Fasheh } 1756ccd979bdSMark Fasheh 1757c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1758c271c5c2SSunil Mushran goto local; 1759c271c5c2SSunil Mushran 1760ccd979bdSMark Fasheh if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1761ccd979bdSMark Fasheh wait_event(osb->recovery_event, 1762ccd979bdSMark Fasheh ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1763ccd979bdSMark Fasheh 1764ccd979bdSMark Fasheh lockres = &OCFS2_I(inode)->ip_meta_lockres; 1765ccd979bdSMark Fasheh level = ex ? LKM_EXMODE : LKM_PRMODE; 1766ccd979bdSMark Fasheh dlm_flags = 0; 1767ccd979bdSMark Fasheh if (arg_flags & OCFS2_META_LOCK_NOQUEUE) 1768ccd979bdSMark Fasheh dlm_flags |= LKM_NOQUEUE; 1769ccd979bdSMark Fasheh 1770ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, level, dlm_flags, arg_flags); 1771ccd979bdSMark Fasheh if (status < 0) { 1772ccd979bdSMark Fasheh if (status != -EAGAIN && status != -EIOCBRETRY) 1773ccd979bdSMark Fasheh mlog_errno(status); 1774ccd979bdSMark Fasheh goto bail; 1775ccd979bdSMark Fasheh } 1776ccd979bdSMark Fasheh 1777ccd979bdSMark Fasheh /* Notify the error cleanup path to drop the cluster lock. */ 1778ccd979bdSMark Fasheh acquired = 1; 1779ccd979bdSMark Fasheh 1780ccd979bdSMark Fasheh /* We wait twice because a node may have died while we were in 1781ccd979bdSMark Fasheh * the lower dlm layers. The second time though, we've 1782ccd979bdSMark Fasheh * committed to owning this lock so we don't allow signals to 1783ccd979bdSMark Fasheh * abort the operation. */ 1784ccd979bdSMark Fasheh if (!(arg_flags & OCFS2_META_LOCK_RECOVERY)) 1785ccd979bdSMark Fasheh wait_event(osb->recovery_event, 1786ccd979bdSMark Fasheh ocfs2_node_map_is_empty(osb, &osb->recovery_map)); 1787ccd979bdSMark Fasheh 1788c271c5c2SSunil Mushran local: 178924c19ef4SMark Fasheh /* 179024c19ef4SMark Fasheh * We only see this flag if we're being called from 179124c19ef4SMark Fasheh * ocfs2_read_locked_inode(). It means we're locking an inode 179224c19ef4SMark Fasheh * which hasn't been populated yet, so clear the refresh flag 179324c19ef4SMark Fasheh * and let the caller handle it. 179424c19ef4SMark Fasheh */ 179524c19ef4SMark Fasheh if (inode->i_state & I_NEW) { 179624c19ef4SMark Fasheh status = 0; 1797c271c5c2SSunil Mushran if (lockres) 179824c19ef4SMark Fasheh ocfs2_complete_lock_res_refresh(lockres, 0); 179924c19ef4SMark Fasheh goto bail; 180024c19ef4SMark Fasheh } 180124c19ef4SMark Fasheh 1802ccd979bdSMark Fasheh /* This is fun. The caller may want a bh back, or it may 1803ccd979bdSMark Fasheh * not. ocfs2_meta_lock_update definitely wants one in, but 1804ccd979bdSMark Fasheh * may or may not read one, depending on what's in the 1805ccd979bdSMark Fasheh * LVB. The result of all of this is that we've *only* gone to 1806ccd979bdSMark Fasheh * disk if we have to, so the complexity is worthwhile. */ 1807ccd979bdSMark Fasheh status = ocfs2_meta_lock_update(inode, &local_bh); 1808ccd979bdSMark Fasheh if (status < 0) { 1809ccd979bdSMark Fasheh if (status != -ENOENT) 1810ccd979bdSMark Fasheh mlog_errno(status); 1811ccd979bdSMark Fasheh goto bail; 1812ccd979bdSMark Fasheh } 1813ccd979bdSMark Fasheh 1814ccd979bdSMark Fasheh if (ret_bh) { 1815ccd979bdSMark Fasheh status = ocfs2_assign_bh(inode, ret_bh, local_bh); 1816ccd979bdSMark Fasheh if (status < 0) { 1817ccd979bdSMark Fasheh mlog_errno(status); 1818ccd979bdSMark Fasheh goto bail; 1819ccd979bdSMark Fasheh } 1820ccd979bdSMark Fasheh } 1821ccd979bdSMark Fasheh 1822ccd979bdSMark Fasheh bail: 1823ccd979bdSMark Fasheh if (status < 0) { 1824ccd979bdSMark Fasheh if (ret_bh && (*ret_bh)) { 1825ccd979bdSMark Fasheh brelse(*ret_bh); 1826ccd979bdSMark Fasheh *ret_bh = NULL; 1827ccd979bdSMark Fasheh } 1828ccd979bdSMark Fasheh if (acquired) 1829ccd979bdSMark Fasheh ocfs2_meta_unlock(inode, ex); 1830ccd979bdSMark Fasheh } 1831ccd979bdSMark Fasheh 1832ccd979bdSMark Fasheh if (local_bh) 1833ccd979bdSMark Fasheh brelse(local_bh); 1834ccd979bdSMark Fasheh 1835ccd979bdSMark Fasheh mlog_exit(status); 1836ccd979bdSMark Fasheh return status; 1837ccd979bdSMark Fasheh } 1838ccd979bdSMark Fasheh 1839ccd979bdSMark Fasheh /* 1840ccd979bdSMark Fasheh * This is working around a lock inversion between tasks acquiring DLM locks 1841ccd979bdSMark Fasheh * while holding a page lock and the vote thread which blocks dlm lock acquiry 1842ccd979bdSMark Fasheh * while acquiring page locks. 1843ccd979bdSMark Fasheh * 1844ccd979bdSMark Fasheh * ** These _with_page variantes are only intended to be called from aop 1845ccd979bdSMark Fasheh * methods that hold page locks and return a very specific *positive* error 1846ccd979bdSMark Fasheh * code that aop methods pass up to the VFS -- test for errors with != 0. ** 1847ccd979bdSMark Fasheh * 1848ccd979bdSMark Fasheh * The DLM is called such that it returns -EAGAIN if it would have blocked 1849ccd979bdSMark Fasheh * waiting for the vote thread. In that case we unlock our page so the vote 1850ccd979bdSMark Fasheh * thread can make progress. Once we've done this we have to return 1851ccd979bdSMark Fasheh * AOP_TRUNCATED_PAGE so the aop method that called us can bubble that back up 1852ccd979bdSMark Fasheh * into the VFS who will then immediately retry the aop call. 1853ccd979bdSMark Fasheh * 1854ccd979bdSMark Fasheh * We do a blocking lock and immediate unlock before returning, though, so that 1855ccd979bdSMark Fasheh * the lock has a great chance of being cached on this node by the time the VFS 1856ccd979bdSMark Fasheh * calls back to retry the aop. This has a potential to livelock as nodes 1857ccd979bdSMark Fasheh * ping locks back and forth, but that's a risk we're willing to take to avoid 1858ccd979bdSMark Fasheh * the lock inversion simply. 1859ccd979bdSMark Fasheh */ 1860ccd979bdSMark Fasheh int ocfs2_meta_lock_with_page(struct inode *inode, 1861ccd979bdSMark Fasheh struct buffer_head **ret_bh, 1862ccd979bdSMark Fasheh int ex, 1863ccd979bdSMark Fasheh struct page *page) 1864ccd979bdSMark Fasheh { 1865ccd979bdSMark Fasheh int ret; 1866ccd979bdSMark Fasheh 18674bcec184SMark Fasheh ret = ocfs2_meta_lock_full(inode, ret_bh, ex, OCFS2_LOCK_NONBLOCK); 1868ccd979bdSMark Fasheh if (ret == -EAGAIN) { 1869ccd979bdSMark Fasheh unlock_page(page); 18704bcec184SMark Fasheh if (ocfs2_meta_lock(inode, ret_bh, ex) == 0) 1871ccd979bdSMark Fasheh ocfs2_meta_unlock(inode, ex); 1872ccd979bdSMark Fasheh ret = AOP_TRUNCATED_PAGE; 1873ccd979bdSMark Fasheh } 1874ccd979bdSMark Fasheh 1875ccd979bdSMark Fasheh return ret; 1876ccd979bdSMark Fasheh } 1877ccd979bdSMark Fasheh 18787f1a37e3STiger Yang int ocfs2_meta_lock_atime(struct inode *inode, 18797f1a37e3STiger Yang struct vfsmount *vfsmnt, 18807f1a37e3STiger Yang int *level) 18817f1a37e3STiger Yang { 18827f1a37e3STiger Yang int ret; 18837f1a37e3STiger Yang 18847f1a37e3STiger Yang mlog_entry_void(); 18857f1a37e3STiger Yang ret = ocfs2_meta_lock(inode, NULL, 0); 18867f1a37e3STiger Yang if (ret < 0) { 18877f1a37e3STiger Yang mlog_errno(ret); 18887f1a37e3STiger Yang return ret; 18897f1a37e3STiger Yang } 18907f1a37e3STiger Yang 18917f1a37e3STiger Yang /* 18927f1a37e3STiger Yang * If we should update atime, we will get EX lock, 18937f1a37e3STiger Yang * otherwise we just get PR lock. 18947f1a37e3STiger Yang */ 18957f1a37e3STiger Yang if (ocfs2_should_update_atime(inode, vfsmnt)) { 18967f1a37e3STiger Yang struct buffer_head *bh = NULL; 18977f1a37e3STiger Yang 18987f1a37e3STiger Yang ocfs2_meta_unlock(inode, 0); 18997f1a37e3STiger Yang ret = ocfs2_meta_lock(inode, &bh, 1); 19007f1a37e3STiger Yang if (ret < 0) { 19017f1a37e3STiger Yang mlog_errno(ret); 19027f1a37e3STiger Yang return ret; 19037f1a37e3STiger Yang } 19047f1a37e3STiger Yang *level = 1; 19057f1a37e3STiger Yang if (ocfs2_should_update_atime(inode, vfsmnt)) 19067f1a37e3STiger Yang ocfs2_update_inode_atime(inode, bh); 19077f1a37e3STiger Yang if (bh) 19087f1a37e3STiger Yang brelse(bh); 19097f1a37e3STiger Yang } else 19107f1a37e3STiger Yang *level = 0; 19117f1a37e3STiger Yang 19127f1a37e3STiger Yang mlog_exit(ret); 19137f1a37e3STiger Yang return ret; 19147f1a37e3STiger Yang } 19157f1a37e3STiger Yang 1916ccd979bdSMark Fasheh void ocfs2_meta_unlock(struct inode *inode, 1917ccd979bdSMark Fasheh int ex) 1918ccd979bdSMark Fasheh { 1919ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1920ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &OCFS2_I(inode)->ip_meta_lockres; 1921c271c5c2SSunil Mushran struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 1922ccd979bdSMark Fasheh 1923ccd979bdSMark Fasheh mlog_entry_void(); 1924ccd979bdSMark Fasheh 1925b0697053SMark Fasheh mlog(0, "inode %llu drop %s META lock\n", 1926b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno, 1927ccd979bdSMark Fasheh ex ? "EXMODE" : "PRMODE"); 1928ccd979bdSMark Fasheh 1929c271c5c2SSunil Mushran if (!ocfs2_is_hard_readonly(OCFS2_SB(inode->i_sb)) && 1930c271c5c2SSunil Mushran !ocfs2_mount_local(osb)) 1931ccd979bdSMark Fasheh ocfs2_cluster_unlock(OCFS2_SB(inode->i_sb), lockres, level); 1932ccd979bdSMark Fasheh 1933ccd979bdSMark Fasheh mlog_exit_void(); 1934ccd979bdSMark Fasheh } 1935ccd979bdSMark Fasheh 1936ccd979bdSMark Fasheh int ocfs2_super_lock(struct ocfs2_super *osb, 1937ccd979bdSMark Fasheh int ex) 1938ccd979bdSMark Fasheh { 1939c271c5c2SSunil Mushran int status = 0; 1940ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1941ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1942ccd979bdSMark Fasheh struct buffer_head *bh; 1943ccd979bdSMark Fasheh struct ocfs2_slot_info *si = osb->slot_info; 1944ccd979bdSMark Fasheh 1945ccd979bdSMark Fasheh mlog_entry_void(); 1946ccd979bdSMark Fasheh 1947ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) 1948ccd979bdSMark Fasheh return -EROFS; 1949ccd979bdSMark Fasheh 1950c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 1951c271c5c2SSunil Mushran goto bail; 1952c271c5c2SSunil Mushran 1953ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, level, 0, 0); 1954ccd979bdSMark Fasheh if (status < 0) { 1955ccd979bdSMark Fasheh mlog_errno(status); 1956ccd979bdSMark Fasheh goto bail; 1957ccd979bdSMark Fasheh } 1958ccd979bdSMark Fasheh 1959ccd979bdSMark Fasheh /* The super block lock path is really in the best position to 1960ccd979bdSMark Fasheh * know when resources covered by the lock need to be 1961ccd979bdSMark Fasheh * refreshed, so we do it here. Of course, making sense of 1962ccd979bdSMark Fasheh * everything is up to the caller :) */ 1963ccd979bdSMark Fasheh status = ocfs2_should_refresh_lock_res(lockres); 1964ccd979bdSMark Fasheh if (status < 0) { 1965ccd979bdSMark Fasheh mlog_errno(status); 1966ccd979bdSMark Fasheh goto bail; 1967ccd979bdSMark Fasheh } 1968ccd979bdSMark Fasheh if (status) { 1969ccd979bdSMark Fasheh bh = si->si_bh; 1970ccd979bdSMark Fasheh status = ocfs2_read_block(osb, bh->b_blocknr, &bh, 0, 1971ccd979bdSMark Fasheh si->si_inode); 1972ccd979bdSMark Fasheh if (status == 0) 1973ccd979bdSMark Fasheh ocfs2_update_slot_info(si); 1974ccd979bdSMark Fasheh 1975ccd979bdSMark Fasheh ocfs2_complete_lock_res_refresh(lockres, status); 1976ccd979bdSMark Fasheh 1977ccd979bdSMark Fasheh if (status < 0) 1978ccd979bdSMark Fasheh mlog_errno(status); 1979ccd979bdSMark Fasheh } 1980ccd979bdSMark Fasheh bail: 1981ccd979bdSMark Fasheh mlog_exit(status); 1982ccd979bdSMark Fasheh return status; 1983ccd979bdSMark Fasheh } 1984ccd979bdSMark Fasheh 1985ccd979bdSMark Fasheh void ocfs2_super_unlock(struct ocfs2_super *osb, 1986ccd979bdSMark Fasheh int ex) 1987ccd979bdSMark Fasheh { 1988ccd979bdSMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 1989ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_super_lockres; 1990ccd979bdSMark Fasheh 1991c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 1992ccd979bdSMark Fasheh ocfs2_cluster_unlock(osb, lockres, level); 1993ccd979bdSMark Fasheh } 1994ccd979bdSMark Fasheh 1995ccd979bdSMark Fasheh int ocfs2_rename_lock(struct ocfs2_super *osb) 1996ccd979bdSMark Fasheh { 1997ccd979bdSMark Fasheh int status; 1998ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 1999ccd979bdSMark Fasheh 2000ccd979bdSMark Fasheh if (ocfs2_is_hard_readonly(osb)) 2001ccd979bdSMark Fasheh return -EROFS; 2002ccd979bdSMark Fasheh 2003c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 2004c271c5c2SSunil Mushran return 0; 2005c271c5c2SSunil Mushran 2006ccd979bdSMark Fasheh status = ocfs2_cluster_lock(osb, lockres, LKM_EXMODE, 0, 0); 2007ccd979bdSMark Fasheh if (status < 0) 2008ccd979bdSMark Fasheh mlog_errno(status); 2009ccd979bdSMark Fasheh 2010ccd979bdSMark Fasheh return status; 2011ccd979bdSMark Fasheh } 2012ccd979bdSMark Fasheh 2013ccd979bdSMark Fasheh void ocfs2_rename_unlock(struct ocfs2_super *osb) 2014ccd979bdSMark Fasheh { 2015ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = &osb->osb_rename_lockres; 2016ccd979bdSMark Fasheh 2017c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 2018ccd979bdSMark Fasheh ocfs2_cluster_unlock(osb, lockres, LKM_EXMODE); 2019ccd979bdSMark Fasheh } 2020ccd979bdSMark Fasheh 2021d680efe9SMark Fasheh int ocfs2_dentry_lock(struct dentry *dentry, int ex) 2022d680efe9SMark Fasheh { 2023d680efe9SMark Fasheh int ret; 2024d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 2025d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 2026d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 2027d680efe9SMark Fasheh 2028d680efe9SMark Fasheh BUG_ON(!dl); 2029d680efe9SMark Fasheh 2030d680efe9SMark Fasheh if (ocfs2_is_hard_readonly(osb)) 2031d680efe9SMark Fasheh return -EROFS; 2032d680efe9SMark Fasheh 2033c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 2034c271c5c2SSunil Mushran return 0; 2035c271c5c2SSunil Mushran 2036d680efe9SMark Fasheh ret = ocfs2_cluster_lock(osb, &dl->dl_lockres, level, 0, 0); 2037d680efe9SMark Fasheh if (ret < 0) 2038d680efe9SMark Fasheh mlog_errno(ret); 2039d680efe9SMark Fasheh 2040d680efe9SMark Fasheh return ret; 2041d680efe9SMark Fasheh } 2042d680efe9SMark Fasheh 2043d680efe9SMark Fasheh void ocfs2_dentry_unlock(struct dentry *dentry, int ex) 2044d680efe9SMark Fasheh { 2045d680efe9SMark Fasheh int level = ex ? LKM_EXMODE : LKM_PRMODE; 2046d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = dentry->d_fsdata; 2047d680efe9SMark Fasheh struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb); 2048d680efe9SMark Fasheh 2049c271c5c2SSunil Mushran if (!ocfs2_mount_local(osb)) 2050d680efe9SMark Fasheh ocfs2_cluster_unlock(osb, &dl->dl_lockres, level); 2051d680efe9SMark Fasheh } 2052d680efe9SMark Fasheh 2053ccd979bdSMark Fasheh /* Reference counting of the dlm debug structure. We want this because 2054ccd979bdSMark Fasheh * open references on the debug inodes can live on after a mount, so 2055ccd979bdSMark Fasheh * we can't rely on the ocfs2_super to always exist. */ 2056ccd979bdSMark Fasheh static void ocfs2_dlm_debug_free(struct kref *kref) 2057ccd979bdSMark Fasheh { 2058ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug; 2059ccd979bdSMark Fasheh 2060ccd979bdSMark Fasheh dlm_debug = container_of(kref, struct ocfs2_dlm_debug, d_refcnt); 2061ccd979bdSMark Fasheh 2062ccd979bdSMark Fasheh kfree(dlm_debug); 2063ccd979bdSMark Fasheh } 2064ccd979bdSMark Fasheh 2065ccd979bdSMark Fasheh void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug) 2066ccd979bdSMark Fasheh { 2067ccd979bdSMark Fasheh if (dlm_debug) 2068ccd979bdSMark Fasheh kref_put(&dlm_debug->d_refcnt, ocfs2_dlm_debug_free); 2069ccd979bdSMark Fasheh } 2070ccd979bdSMark Fasheh 2071ccd979bdSMark Fasheh static void ocfs2_get_dlm_debug(struct ocfs2_dlm_debug *debug) 2072ccd979bdSMark Fasheh { 2073ccd979bdSMark Fasheh kref_get(&debug->d_refcnt); 2074ccd979bdSMark Fasheh } 2075ccd979bdSMark Fasheh 2076ccd979bdSMark Fasheh struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void) 2077ccd979bdSMark Fasheh { 2078ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug; 2079ccd979bdSMark Fasheh 2080ccd979bdSMark Fasheh dlm_debug = kmalloc(sizeof(struct ocfs2_dlm_debug), GFP_KERNEL); 2081ccd979bdSMark Fasheh if (!dlm_debug) { 2082ccd979bdSMark Fasheh mlog_errno(-ENOMEM); 2083ccd979bdSMark Fasheh goto out; 2084ccd979bdSMark Fasheh } 2085ccd979bdSMark Fasheh 2086ccd979bdSMark Fasheh kref_init(&dlm_debug->d_refcnt); 2087ccd979bdSMark Fasheh INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking); 2088ccd979bdSMark Fasheh dlm_debug->d_locking_state = NULL; 2089ccd979bdSMark Fasheh out: 2090ccd979bdSMark Fasheh return dlm_debug; 2091ccd979bdSMark Fasheh } 2092ccd979bdSMark Fasheh 2093ccd979bdSMark Fasheh /* Access to this is arbitrated for us via seq_file->sem. */ 2094ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv { 2095ccd979bdSMark Fasheh struct ocfs2_dlm_debug *p_dlm_debug; 2096ccd979bdSMark Fasheh struct ocfs2_lock_res p_iter_res; 2097ccd979bdSMark Fasheh struct ocfs2_lock_res p_tmp_res; 2098ccd979bdSMark Fasheh }; 2099ccd979bdSMark Fasheh 2100ccd979bdSMark Fasheh static struct ocfs2_lock_res *ocfs2_dlm_next_res(struct ocfs2_lock_res *start, 2101ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv) 2102ccd979bdSMark Fasheh { 2103ccd979bdSMark Fasheh struct ocfs2_lock_res *iter, *ret = NULL; 2104ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = priv->p_dlm_debug; 2105ccd979bdSMark Fasheh 2106ccd979bdSMark Fasheh assert_spin_locked(&ocfs2_dlm_tracking_lock); 2107ccd979bdSMark Fasheh 2108ccd979bdSMark Fasheh list_for_each_entry(iter, &start->l_debug_list, l_debug_list) { 2109ccd979bdSMark Fasheh /* discover the head of the list */ 2110ccd979bdSMark Fasheh if (&iter->l_debug_list == &dlm_debug->d_lockres_tracking) { 2111ccd979bdSMark Fasheh mlog(0, "End of list found, %p\n", ret); 2112ccd979bdSMark Fasheh break; 2113ccd979bdSMark Fasheh } 2114ccd979bdSMark Fasheh 2115ccd979bdSMark Fasheh /* We track our "dummy" iteration lockres' by a NULL 2116ccd979bdSMark Fasheh * l_ops field. */ 2117ccd979bdSMark Fasheh if (iter->l_ops != NULL) { 2118ccd979bdSMark Fasheh ret = iter; 2119ccd979bdSMark Fasheh break; 2120ccd979bdSMark Fasheh } 2121ccd979bdSMark Fasheh } 2122ccd979bdSMark Fasheh 2123ccd979bdSMark Fasheh return ret; 2124ccd979bdSMark Fasheh } 2125ccd979bdSMark Fasheh 2126ccd979bdSMark Fasheh static void *ocfs2_dlm_seq_start(struct seq_file *m, loff_t *pos) 2127ccd979bdSMark Fasheh { 2128ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = m->private; 2129ccd979bdSMark Fasheh struct ocfs2_lock_res *iter; 2130ccd979bdSMark Fasheh 2131ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 2132ccd979bdSMark Fasheh iter = ocfs2_dlm_next_res(&priv->p_iter_res, priv); 2133ccd979bdSMark Fasheh if (iter) { 2134ccd979bdSMark Fasheh /* Since lockres' have the lifetime of their container 2135ccd979bdSMark Fasheh * (which can be inodes, ocfs2_supers, etc) we want to 2136ccd979bdSMark Fasheh * copy this out to a temporary lockres while still 2137ccd979bdSMark Fasheh * under the spinlock. Obviously after this we can't 2138ccd979bdSMark Fasheh * trust any pointers on the copy returned, but that's 2139ccd979bdSMark Fasheh * ok as the information we want isn't typically held 2140ccd979bdSMark Fasheh * in them. */ 2141ccd979bdSMark Fasheh priv->p_tmp_res = *iter; 2142ccd979bdSMark Fasheh iter = &priv->p_tmp_res; 2143ccd979bdSMark Fasheh } 2144ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 2145ccd979bdSMark Fasheh 2146ccd979bdSMark Fasheh return iter; 2147ccd979bdSMark Fasheh } 2148ccd979bdSMark Fasheh 2149ccd979bdSMark Fasheh static void ocfs2_dlm_seq_stop(struct seq_file *m, void *v) 2150ccd979bdSMark Fasheh { 2151ccd979bdSMark Fasheh } 2152ccd979bdSMark Fasheh 2153ccd979bdSMark Fasheh static void *ocfs2_dlm_seq_next(struct seq_file *m, void *v, loff_t *pos) 2154ccd979bdSMark Fasheh { 2155ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = m->private; 2156ccd979bdSMark Fasheh struct ocfs2_lock_res *iter = v; 2157ccd979bdSMark Fasheh struct ocfs2_lock_res *dummy = &priv->p_iter_res; 2158ccd979bdSMark Fasheh 2159ccd979bdSMark Fasheh spin_lock(&ocfs2_dlm_tracking_lock); 2160ccd979bdSMark Fasheh iter = ocfs2_dlm_next_res(iter, priv); 2161ccd979bdSMark Fasheh list_del_init(&dummy->l_debug_list); 2162ccd979bdSMark Fasheh if (iter) { 2163ccd979bdSMark Fasheh list_add(&dummy->l_debug_list, &iter->l_debug_list); 2164ccd979bdSMark Fasheh priv->p_tmp_res = *iter; 2165ccd979bdSMark Fasheh iter = &priv->p_tmp_res; 2166ccd979bdSMark Fasheh } 2167ccd979bdSMark Fasheh spin_unlock(&ocfs2_dlm_tracking_lock); 2168ccd979bdSMark Fasheh 2169ccd979bdSMark Fasheh return iter; 2170ccd979bdSMark Fasheh } 2171ccd979bdSMark Fasheh 2172ccd979bdSMark Fasheh /* So that debugfs.ocfs2 can determine which format is being used */ 2173ccd979bdSMark Fasheh #define OCFS2_DLM_DEBUG_STR_VERSION 1 2174ccd979bdSMark Fasheh static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) 2175ccd979bdSMark Fasheh { 2176ccd979bdSMark Fasheh int i; 2177ccd979bdSMark Fasheh char *lvb; 2178ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = v; 2179ccd979bdSMark Fasheh 2180ccd979bdSMark Fasheh if (!lockres) 2181ccd979bdSMark Fasheh return -EINVAL; 2182ccd979bdSMark Fasheh 2183d680efe9SMark Fasheh seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION); 2184d680efe9SMark Fasheh 2185d680efe9SMark Fasheh if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY) 2186d680efe9SMark Fasheh seq_printf(m, "%.*s%08x\t", OCFS2_DENTRY_LOCK_INO_START - 1, 2187d680efe9SMark Fasheh lockres->l_name, 2188d680efe9SMark Fasheh (unsigned int)ocfs2_get_dentry_lock_ino(lockres)); 2189d680efe9SMark Fasheh else 2190d680efe9SMark Fasheh seq_printf(m, "%.*s\t", OCFS2_LOCK_ID_MAX_LEN, lockres->l_name); 2191d680efe9SMark Fasheh 2192d680efe9SMark Fasheh seq_printf(m, "%d\t" 2193ccd979bdSMark Fasheh "0x%lx\t" 2194ccd979bdSMark Fasheh "0x%x\t" 2195ccd979bdSMark Fasheh "0x%x\t" 2196ccd979bdSMark Fasheh "%u\t" 2197ccd979bdSMark Fasheh "%u\t" 2198ccd979bdSMark Fasheh "%d\t" 2199ccd979bdSMark Fasheh "%d\t", 2200ccd979bdSMark Fasheh lockres->l_level, 2201ccd979bdSMark Fasheh lockres->l_flags, 2202ccd979bdSMark Fasheh lockres->l_action, 2203ccd979bdSMark Fasheh lockres->l_unlock_action, 2204ccd979bdSMark Fasheh lockres->l_ro_holders, 2205ccd979bdSMark Fasheh lockres->l_ex_holders, 2206ccd979bdSMark Fasheh lockres->l_requested, 2207ccd979bdSMark Fasheh lockres->l_blocking); 2208ccd979bdSMark Fasheh 2209ccd979bdSMark Fasheh /* Dump the raw LVB */ 2210ccd979bdSMark Fasheh lvb = lockres->l_lksb.lvb; 2211ccd979bdSMark Fasheh for(i = 0; i < DLM_LVB_LEN; i++) 2212ccd979bdSMark Fasheh seq_printf(m, "0x%x\t", lvb[i]); 2213ccd979bdSMark Fasheh 2214ccd979bdSMark Fasheh /* End the line */ 2215ccd979bdSMark Fasheh seq_printf(m, "\n"); 2216ccd979bdSMark Fasheh return 0; 2217ccd979bdSMark Fasheh } 2218ccd979bdSMark Fasheh 2219ccd979bdSMark Fasheh static struct seq_operations ocfs2_dlm_seq_ops = { 2220ccd979bdSMark Fasheh .start = ocfs2_dlm_seq_start, 2221ccd979bdSMark Fasheh .stop = ocfs2_dlm_seq_stop, 2222ccd979bdSMark Fasheh .next = ocfs2_dlm_seq_next, 2223ccd979bdSMark Fasheh .show = ocfs2_dlm_seq_show, 2224ccd979bdSMark Fasheh }; 2225ccd979bdSMark Fasheh 2226ccd979bdSMark Fasheh static int ocfs2_dlm_debug_release(struct inode *inode, struct file *file) 2227ccd979bdSMark Fasheh { 2228ccd979bdSMark Fasheh struct seq_file *seq = (struct seq_file *) file->private_data; 2229ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv = seq->private; 2230ccd979bdSMark Fasheh struct ocfs2_lock_res *res = &priv->p_iter_res; 2231ccd979bdSMark Fasheh 2232ccd979bdSMark Fasheh ocfs2_remove_lockres_tracking(res); 2233ccd979bdSMark Fasheh ocfs2_put_dlm_debug(priv->p_dlm_debug); 2234ccd979bdSMark Fasheh return seq_release_private(inode, file); 2235ccd979bdSMark Fasheh } 2236ccd979bdSMark Fasheh 2237ccd979bdSMark Fasheh static int ocfs2_dlm_debug_open(struct inode *inode, struct file *file) 2238ccd979bdSMark Fasheh { 2239ccd979bdSMark Fasheh int ret; 2240ccd979bdSMark Fasheh struct ocfs2_dlm_seq_priv *priv; 2241ccd979bdSMark Fasheh struct seq_file *seq; 2242ccd979bdSMark Fasheh struct ocfs2_super *osb; 2243ccd979bdSMark Fasheh 2244ccd979bdSMark Fasheh priv = kzalloc(sizeof(struct ocfs2_dlm_seq_priv), GFP_KERNEL); 2245ccd979bdSMark Fasheh if (!priv) { 2246ccd979bdSMark Fasheh ret = -ENOMEM; 2247ccd979bdSMark Fasheh mlog_errno(ret); 2248ccd979bdSMark Fasheh goto out; 2249ccd979bdSMark Fasheh } 22508e18e294STheodore Ts'o osb = inode->i_private; 2251ccd979bdSMark Fasheh ocfs2_get_dlm_debug(osb->osb_dlm_debug); 2252ccd979bdSMark Fasheh priv->p_dlm_debug = osb->osb_dlm_debug; 2253ccd979bdSMark Fasheh INIT_LIST_HEAD(&priv->p_iter_res.l_debug_list); 2254ccd979bdSMark Fasheh 2255ccd979bdSMark Fasheh ret = seq_open(file, &ocfs2_dlm_seq_ops); 2256ccd979bdSMark Fasheh if (ret) { 2257ccd979bdSMark Fasheh kfree(priv); 2258ccd979bdSMark Fasheh mlog_errno(ret); 2259ccd979bdSMark Fasheh goto out; 2260ccd979bdSMark Fasheh } 2261ccd979bdSMark Fasheh 2262ccd979bdSMark Fasheh seq = (struct seq_file *) file->private_data; 2263ccd979bdSMark Fasheh seq->private = priv; 2264ccd979bdSMark Fasheh 2265ccd979bdSMark Fasheh ocfs2_add_lockres_tracking(&priv->p_iter_res, 2266ccd979bdSMark Fasheh priv->p_dlm_debug); 2267ccd979bdSMark Fasheh 2268ccd979bdSMark Fasheh out: 2269ccd979bdSMark Fasheh return ret; 2270ccd979bdSMark Fasheh } 2271ccd979bdSMark Fasheh 22724b6f5d20SArjan van de Ven static const struct file_operations ocfs2_dlm_debug_fops = { 2273ccd979bdSMark Fasheh .open = ocfs2_dlm_debug_open, 2274ccd979bdSMark Fasheh .release = ocfs2_dlm_debug_release, 2275ccd979bdSMark Fasheh .read = seq_read, 2276ccd979bdSMark Fasheh .llseek = seq_lseek, 2277ccd979bdSMark Fasheh }; 2278ccd979bdSMark Fasheh 2279ccd979bdSMark Fasheh static int ocfs2_dlm_init_debug(struct ocfs2_super *osb) 2280ccd979bdSMark Fasheh { 2281ccd979bdSMark Fasheh int ret = 0; 2282ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2283ccd979bdSMark Fasheh 2284ccd979bdSMark Fasheh dlm_debug->d_locking_state = debugfs_create_file("locking_state", 2285ccd979bdSMark Fasheh S_IFREG|S_IRUSR, 2286ccd979bdSMark Fasheh osb->osb_debug_root, 2287ccd979bdSMark Fasheh osb, 2288ccd979bdSMark Fasheh &ocfs2_dlm_debug_fops); 2289ccd979bdSMark Fasheh if (!dlm_debug->d_locking_state) { 2290ccd979bdSMark Fasheh ret = -EINVAL; 2291ccd979bdSMark Fasheh mlog(ML_ERROR, 2292ccd979bdSMark Fasheh "Unable to create locking state debugfs file.\n"); 2293ccd979bdSMark Fasheh goto out; 2294ccd979bdSMark Fasheh } 2295ccd979bdSMark Fasheh 2296ccd979bdSMark Fasheh ocfs2_get_dlm_debug(dlm_debug); 2297ccd979bdSMark Fasheh out: 2298ccd979bdSMark Fasheh return ret; 2299ccd979bdSMark Fasheh } 2300ccd979bdSMark Fasheh 2301ccd979bdSMark Fasheh static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb) 2302ccd979bdSMark Fasheh { 2303ccd979bdSMark Fasheh struct ocfs2_dlm_debug *dlm_debug = osb->osb_dlm_debug; 2304ccd979bdSMark Fasheh 2305ccd979bdSMark Fasheh if (dlm_debug) { 2306ccd979bdSMark Fasheh debugfs_remove(dlm_debug->d_locking_state); 2307ccd979bdSMark Fasheh ocfs2_put_dlm_debug(dlm_debug); 2308ccd979bdSMark Fasheh } 2309ccd979bdSMark Fasheh } 2310ccd979bdSMark Fasheh 2311ccd979bdSMark Fasheh int ocfs2_dlm_init(struct ocfs2_super *osb) 2312ccd979bdSMark Fasheh { 2313c271c5c2SSunil Mushran int status = 0; 2314ccd979bdSMark Fasheh u32 dlm_key; 2315c271c5c2SSunil Mushran struct dlm_ctxt *dlm = NULL; 2316ccd979bdSMark Fasheh 2317ccd979bdSMark Fasheh mlog_entry_void(); 2318ccd979bdSMark Fasheh 2319c271c5c2SSunil Mushran if (ocfs2_mount_local(osb)) 2320c271c5c2SSunil Mushran goto local; 2321c271c5c2SSunil Mushran 2322ccd979bdSMark Fasheh status = ocfs2_dlm_init_debug(osb); 2323ccd979bdSMark Fasheh if (status < 0) { 2324ccd979bdSMark Fasheh mlog_errno(status); 2325ccd979bdSMark Fasheh goto bail; 2326ccd979bdSMark Fasheh } 2327ccd979bdSMark Fasheh 2328ccd979bdSMark Fasheh /* launch vote thread */ 232978427043SMark Fasheh osb->vote_task = kthread_run(ocfs2_vote_thread, osb, "ocfs2vote"); 2330ccd979bdSMark Fasheh if (IS_ERR(osb->vote_task)) { 2331ccd979bdSMark Fasheh status = PTR_ERR(osb->vote_task); 2332ccd979bdSMark Fasheh osb->vote_task = NULL; 2333ccd979bdSMark Fasheh mlog_errno(status); 2334ccd979bdSMark Fasheh goto bail; 2335ccd979bdSMark Fasheh } 2336ccd979bdSMark Fasheh 2337ccd979bdSMark Fasheh /* used by the dlm code to make message headers unique, each 2338ccd979bdSMark Fasheh * node in this domain must agree on this. */ 2339ccd979bdSMark Fasheh dlm_key = crc32_le(0, osb->uuid_str, strlen(osb->uuid_str)); 2340ccd979bdSMark Fasheh 2341ccd979bdSMark Fasheh /* for now, uuid == domain */ 2342ccd979bdSMark Fasheh dlm = dlm_register_domain(osb->uuid_str, dlm_key); 2343ccd979bdSMark Fasheh if (IS_ERR(dlm)) { 2344ccd979bdSMark Fasheh status = PTR_ERR(dlm); 2345ccd979bdSMark Fasheh mlog_errno(status); 2346ccd979bdSMark Fasheh goto bail; 2347ccd979bdSMark Fasheh } 2348ccd979bdSMark Fasheh 2349c271c5c2SSunil Mushran dlm_register_eviction_cb(dlm, &osb->osb_eviction_cb); 2350c271c5c2SSunil Mushran 2351c271c5c2SSunil Mushran local: 2352ccd979bdSMark Fasheh ocfs2_super_lock_res_init(&osb->osb_super_lockres, osb); 2353ccd979bdSMark Fasheh ocfs2_rename_lock_res_init(&osb->osb_rename_lockres, osb); 2354ccd979bdSMark Fasheh 2355ccd979bdSMark Fasheh osb->dlm = dlm; 2356ccd979bdSMark Fasheh 2357ccd979bdSMark Fasheh status = 0; 2358ccd979bdSMark Fasheh bail: 2359ccd979bdSMark Fasheh if (status < 0) { 2360ccd979bdSMark Fasheh ocfs2_dlm_shutdown_debug(osb); 2361ccd979bdSMark Fasheh if (osb->vote_task) 2362ccd979bdSMark Fasheh kthread_stop(osb->vote_task); 2363ccd979bdSMark Fasheh } 2364ccd979bdSMark Fasheh 2365ccd979bdSMark Fasheh mlog_exit(status); 2366ccd979bdSMark Fasheh return status; 2367ccd979bdSMark Fasheh } 2368ccd979bdSMark Fasheh 2369ccd979bdSMark Fasheh void ocfs2_dlm_shutdown(struct ocfs2_super *osb) 2370ccd979bdSMark Fasheh { 2371ccd979bdSMark Fasheh mlog_entry_void(); 2372ccd979bdSMark Fasheh 2373ccd979bdSMark Fasheh dlm_unregister_eviction_cb(&osb->osb_eviction_cb); 2374ccd979bdSMark Fasheh 2375ccd979bdSMark Fasheh ocfs2_drop_osb_locks(osb); 2376ccd979bdSMark Fasheh 2377ccd979bdSMark Fasheh if (osb->vote_task) { 2378ccd979bdSMark Fasheh kthread_stop(osb->vote_task); 2379ccd979bdSMark Fasheh osb->vote_task = NULL; 2380ccd979bdSMark Fasheh } 2381ccd979bdSMark Fasheh 2382ccd979bdSMark Fasheh ocfs2_lock_res_free(&osb->osb_super_lockres); 2383ccd979bdSMark Fasheh ocfs2_lock_res_free(&osb->osb_rename_lockres); 2384ccd979bdSMark Fasheh 2385ccd979bdSMark Fasheh dlm_unregister_domain(osb->dlm); 2386ccd979bdSMark Fasheh osb->dlm = NULL; 2387ccd979bdSMark Fasheh 2388ccd979bdSMark Fasheh ocfs2_dlm_shutdown_debug(osb); 2389ccd979bdSMark Fasheh 2390ccd979bdSMark Fasheh mlog_exit_void(); 2391ccd979bdSMark Fasheh } 2392ccd979bdSMark Fasheh 23932a45f2d1SMark Fasheh static void ocfs2_unlock_ast(void *opaque, enum dlm_status status) 2394ccd979bdSMark Fasheh { 2395ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres = opaque; 2396ccd979bdSMark Fasheh unsigned long flags; 2397ccd979bdSMark Fasheh 2398ccd979bdSMark Fasheh mlog_entry_void(); 2399ccd979bdSMark Fasheh 2400ccd979bdSMark Fasheh mlog(0, "UNLOCK AST called on lock %s, action = %d\n", lockres->l_name, 2401ccd979bdSMark Fasheh lockres->l_unlock_action); 2402ccd979bdSMark Fasheh 2403ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2404ccd979bdSMark Fasheh /* We tried to cancel a convert request, but it was already 2405ccd979bdSMark Fasheh * granted. All we want to do here is clear our unlock 2406ccd979bdSMark Fasheh * state. The wake_up call done at the bottom is redundant 2407ccd979bdSMark Fasheh * (ocfs2_prepare_cancel_convert doesn't sleep on this) but doesn't 2408ccd979bdSMark Fasheh * hurt anything anyway */ 2409ccd979bdSMark Fasheh if (status == DLM_CANCELGRANT && 2410ccd979bdSMark Fasheh lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2411ccd979bdSMark Fasheh mlog(0, "Got cancelgrant for %s\n", lockres->l_name); 2412ccd979bdSMark Fasheh 2413ccd979bdSMark Fasheh /* We don't clear the busy flag in this case as it 2414ccd979bdSMark Fasheh * should have been cleared by the ast which the dlm 2415ccd979bdSMark Fasheh * has called. */ 2416ccd979bdSMark Fasheh goto complete_unlock; 2417ccd979bdSMark Fasheh } 2418ccd979bdSMark Fasheh 2419ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2420ccd979bdSMark Fasheh mlog(ML_ERROR, "Dlm passes status %d for lock %s, " 2421ccd979bdSMark Fasheh "unlock_action %d\n", status, lockres->l_name, 2422ccd979bdSMark Fasheh lockres->l_unlock_action); 2423ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2424ccd979bdSMark Fasheh return; 2425ccd979bdSMark Fasheh } 2426ccd979bdSMark Fasheh 2427ccd979bdSMark Fasheh switch(lockres->l_unlock_action) { 2428ccd979bdSMark Fasheh case OCFS2_UNLOCK_CANCEL_CONVERT: 2429ccd979bdSMark Fasheh mlog(0, "Cancel convert success for %s\n", lockres->l_name); 2430ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_INVALID; 2431ccd979bdSMark Fasheh break; 2432ccd979bdSMark Fasheh case OCFS2_UNLOCK_DROP_LOCK: 2433ccd979bdSMark Fasheh lockres->l_level = LKM_IVMODE; 2434ccd979bdSMark Fasheh break; 2435ccd979bdSMark Fasheh default: 2436ccd979bdSMark Fasheh BUG(); 2437ccd979bdSMark Fasheh } 2438ccd979bdSMark Fasheh 2439ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_BUSY); 2440ccd979bdSMark Fasheh complete_unlock: 2441ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_INVALID; 2442ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2443ccd979bdSMark Fasheh 2444ccd979bdSMark Fasheh wake_up(&lockres->l_event); 2445ccd979bdSMark Fasheh 2446ccd979bdSMark Fasheh mlog_exit_void(); 2447ccd979bdSMark Fasheh } 2448ccd979bdSMark Fasheh 2449ccd979bdSMark Fasheh static int ocfs2_drop_lock(struct ocfs2_super *osb, 24500d5dc6c2SMark Fasheh struct ocfs2_lock_res *lockres) 2451ccd979bdSMark Fasheh { 2452ccd979bdSMark Fasheh enum dlm_status status; 2453ccd979bdSMark Fasheh unsigned long flags; 2454b80fc012SMark Fasheh int lkm_flags = 0; 2455ccd979bdSMark Fasheh 2456ccd979bdSMark Fasheh /* We didn't get anywhere near actually using this lockres. */ 2457ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_INITIALIZED)) 2458ccd979bdSMark Fasheh goto out; 2459ccd979bdSMark Fasheh 2460b80fc012SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) 2461b80fc012SMark Fasheh lkm_flags |= LKM_VALBLK; 2462b80fc012SMark Fasheh 2463ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2464ccd979bdSMark Fasheh 2465ccd979bdSMark Fasheh mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_FREEING), 2466ccd979bdSMark Fasheh "lockres %s, flags 0x%lx\n", 2467ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 2468ccd979bdSMark Fasheh 2469ccd979bdSMark Fasheh while (lockres->l_flags & OCFS2_LOCK_BUSY) { 2470ccd979bdSMark Fasheh mlog(0, "waiting on busy lock \"%s\": flags = %lx, action = " 2471ccd979bdSMark Fasheh "%u, unlock_action = %u\n", 2472ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags, lockres->l_action, 2473ccd979bdSMark Fasheh lockres->l_unlock_action); 2474ccd979bdSMark Fasheh 2475ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2476ccd979bdSMark Fasheh 2477ccd979bdSMark Fasheh /* XXX: Today we just wait on any busy 2478ccd979bdSMark Fasheh * locks... Perhaps we need to cancel converts in the 2479ccd979bdSMark Fasheh * future? */ 2480ccd979bdSMark Fasheh ocfs2_wait_on_busy_lock(lockres); 2481ccd979bdSMark Fasheh 2482ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2483ccd979bdSMark Fasheh } 2484ccd979bdSMark Fasheh 24850d5dc6c2SMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { 24860d5dc6c2SMark Fasheh if (lockres->l_flags & OCFS2_LOCK_ATTACHED && 24870d5dc6c2SMark Fasheh lockres->l_level == LKM_EXMODE && 24880d5dc6c2SMark Fasheh !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) 24890d5dc6c2SMark Fasheh lockres->l_ops->set_lvb(lockres); 24900d5dc6c2SMark Fasheh } 2491ccd979bdSMark Fasheh 2492ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY) 2493ccd979bdSMark Fasheh mlog(ML_ERROR, "destroying busy lock: \"%s\"\n", 2494ccd979bdSMark Fasheh lockres->l_name); 2495ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BLOCKED) 2496ccd979bdSMark Fasheh mlog(0, "destroying blocked lock: \"%s\"\n", lockres->l_name); 2497ccd979bdSMark Fasheh 2498ccd979bdSMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_ATTACHED)) { 2499ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2500ccd979bdSMark Fasheh goto out; 2501ccd979bdSMark Fasheh } 2502ccd979bdSMark Fasheh 2503ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_ATTACHED); 2504ccd979bdSMark Fasheh 2505ccd979bdSMark Fasheh /* make sure we never get here while waiting for an ast to 2506ccd979bdSMark Fasheh * fire. */ 2507ccd979bdSMark Fasheh BUG_ON(lockres->l_action != OCFS2_AST_INVALID); 2508ccd979bdSMark Fasheh 2509ccd979bdSMark Fasheh /* is this necessary? */ 2510ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2511ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_DROP_LOCK; 2512ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2513ccd979bdSMark Fasheh 2514ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2515ccd979bdSMark Fasheh 2516b80fc012SMark Fasheh status = dlmunlock(osb->dlm, &lockres->l_lksb, lkm_flags, 25172a45f2d1SMark Fasheh ocfs2_unlock_ast, lockres); 2518ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2519ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmunlock", status, lockres); 2520ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres flags: %lu\n", lockres->l_flags); 2521ccd979bdSMark Fasheh dlm_print_one_lock(lockres->l_lksb.lockid); 2522ccd979bdSMark Fasheh BUG(); 2523ccd979bdSMark Fasheh } 2524ccd979bdSMark Fasheh mlog(0, "lock %s, successfull return from dlmunlock\n", 2525ccd979bdSMark Fasheh lockres->l_name); 2526ccd979bdSMark Fasheh 2527ccd979bdSMark Fasheh ocfs2_wait_on_busy_lock(lockres); 2528ccd979bdSMark Fasheh out: 2529ccd979bdSMark Fasheh mlog_exit(0); 2530ccd979bdSMark Fasheh return 0; 2531ccd979bdSMark Fasheh } 2532ccd979bdSMark Fasheh 2533ccd979bdSMark Fasheh /* Mark the lockres as being dropped. It will no longer be 2534ccd979bdSMark Fasheh * queued if blocking, but we still may have to wait on it 2535ccd979bdSMark Fasheh * being dequeued from the vote thread before we can consider 2536ccd979bdSMark Fasheh * it safe to drop. 2537ccd979bdSMark Fasheh * 2538ccd979bdSMark Fasheh * You can *not* attempt to call cluster_lock on this lockres anymore. */ 2539ccd979bdSMark Fasheh void ocfs2_mark_lockres_freeing(struct ocfs2_lock_res *lockres) 2540ccd979bdSMark Fasheh { 2541ccd979bdSMark Fasheh int status; 2542ccd979bdSMark Fasheh struct ocfs2_mask_waiter mw; 2543ccd979bdSMark Fasheh unsigned long flags; 2544ccd979bdSMark Fasheh 2545ccd979bdSMark Fasheh ocfs2_init_mask_waiter(&mw); 2546ccd979bdSMark Fasheh 2547ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2548ccd979bdSMark Fasheh lockres->l_flags |= OCFS2_LOCK_FREEING; 2549ccd979bdSMark Fasheh while (lockres->l_flags & OCFS2_LOCK_QUEUED) { 2550ccd979bdSMark Fasheh lockres_add_mask_waiter(lockres, &mw, OCFS2_LOCK_QUEUED, 0); 2551ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2552ccd979bdSMark Fasheh 2553ccd979bdSMark Fasheh mlog(0, "Waiting on lockres %s\n", lockres->l_name); 2554ccd979bdSMark Fasheh 2555ccd979bdSMark Fasheh status = ocfs2_wait_for_mask(&mw); 2556ccd979bdSMark Fasheh if (status) 2557ccd979bdSMark Fasheh mlog_errno(status); 2558ccd979bdSMark Fasheh 2559ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2560ccd979bdSMark Fasheh } 2561ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2562ccd979bdSMark Fasheh } 2563ccd979bdSMark Fasheh 2564d680efe9SMark Fasheh void ocfs2_simple_drop_lockres(struct ocfs2_super *osb, 2565d680efe9SMark Fasheh struct ocfs2_lock_res *lockres) 2566d680efe9SMark Fasheh { 2567d680efe9SMark Fasheh int ret; 2568d680efe9SMark Fasheh 2569d680efe9SMark Fasheh ocfs2_mark_lockres_freeing(lockres); 25700d5dc6c2SMark Fasheh ret = ocfs2_drop_lock(osb, lockres); 2571d680efe9SMark Fasheh if (ret) 2572d680efe9SMark Fasheh mlog_errno(ret); 2573d680efe9SMark Fasheh } 2574d680efe9SMark Fasheh 2575ccd979bdSMark Fasheh static void ocfs2_drop_osb_locks(struct ocfs2_super *osb) 2576ccd979bdSMark Fasheh { 2577d680efe9SMark Fasheh ocfs2_simple_drop_lockres(osb, &osb->osb_super_lockres); 2578d680efe9SMark Fasheh ocfs2_simple_drop_lockres(osb, &osb->osb_rename_lockres); 2579ccd979bdSMark Fasheh } 2580ccd979bdSMark Fasheh 2581ccd979bdSMark Fasheh int ocfs2_drop_inode_locks(struct inode *inode) 2582ccd979bdSMark Fasheh { 2583ccd979bdSMark Fasheh int status, err; 2584ccd979bdSMark Fasheh 2585ccd979bdSMark Fasheh mlog_entry_void(); 2586ccd979bdSMark Fasheh 2587ccd979bdSMark Fasheh /* No need to call ocfs2_mark_lockres_freeing here - 2588ccd979bdSMark Fasheh * ocfs2_clear_inode has done it for us. */ 2589ccd979bdSMark Fasheh 2590ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 259150008630STiger Yang &OCFS2_I(inode)->ip_open_lockres); 2592ccd979bdSMark Fasheh if (err < 0) 2593ccd979bdSMark Fasheh mlog_errno(err); 2594ccd979bdSMark Fasheh 2595ccd979bdSMark Fasheh status = err; 2596ccd979bdSMark Fasheh 2597ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 259850008630STiger Yang &OCFS2_I(inode)->ip_data_lockres); 259950008630STiger Yang if (err < 0) 260050008630STiger Yang mlog_errno(err); 260150008630STiger Yang if (err < 0 && !status) 260250008630STiger Yang status = err; 260350008630STiger Yang 260450008630STiger Yang err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 26050d5dc6c2SMark Fasheh &OCFS2_I(inode)->ip_meta_lockres); 2606ccd979bdSMark Fasheh if (err < 0) 2607ccd979bdSMark Fasheh mlog_errno(err); 2608ccd979bdSMark Fasheh if (err < 0 && !status) 2609ccd979bdSMark Fasheh status = err; 2610ccd979bdSMark Fasheh 2611ccd979bdSMark Fasheh err = ocfs2_drop_lock(OCFS2_SB(inode->i_sb), 26120d5dc6c2SMark Fasheh &OCFS2_I(inode)->ip_rw_lockres); 2613ccd979bdSMark Fasheh if (err < 0) 2614ccd979bdSMark Fasheh mlog_errno(err); 2615ccd979bdSMark Fasheh if (err < 0 && !status) 2616ccd979bdSMark Fasheh status = err; 2617ccd979bdSMark Fasheh 2618ccd979bdSMark Fasheh mlog_exit(status); 2619ccd979bdSMark Fasheh return status; 2620ccd979bdSMark Fasheh } 2621ccd979bdSMark Fasheh 2622ccd979bdSMark Fasheh static void ocfs2_prepare_downconvert(struct ocfs2_lock_res *lockres, 2623ccd979bdSMark Fasheh int new_level) 2624ccd979bdSMark Fasheh { 2625ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 2626ccd979bdSMark Fasheh 2627ccd979bdSMark Fasheh BUG_ON(lockres->l_blocking <= LKM_NLMODE); 2628ccd979bdSMark Fasheh 2629ccd979bdSMark Fasheh if (lockres->l_level <= new_level) { 2630ccd979bdSMark Fasheh mlog(ML_ERROR, "lockres->l_level (%u) <= new_level (%u)\n", 2631ccd979bdSMark Fasheh lockres->l_level, new_level); 2632ccd979bdSMark Fasheh BUG(); 2633ccd979bdSMark Fasheh } 2634ccd979bdSMark Fasheh 2635ccd979bdSMark Fasheh mlog(0, "lock %s, new_level = %d, l_blocking = %d\n", 2636ccd979bdSMark Fasheh lockres->l_name, new_level, lockres->l_blocking); 2637ccd979bdSMark Fasheh 2638ccd979bdSMark Fasheh lockres->l_action = OCFS2_AST_DOWNCONVERT; 2639ccd979bdSMark Fasheh lockres->l_requested = new_level; 2640ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_BUSY); 2641ccd979bdSMark Fasheh } 2642ccd979bdSMark Fasheh 2643ccd979bdSMark Fasheh static int ocfs2_downconvert_lock(struct ocfs2_super *osb, 2644ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 2645ccd979bdSMark Fasheh int new_level, 2646ccd979bdSMark Fasheh int lvb) 2647ccd979bdSMark Fasheh { 2648ccd979bdSMark Fasheh int ret, dlm_flags = LKM_CONVERT; 2649ccd979bdSMark Fasheh enum dlm_status status; 2650ccd979bdSMark Fasheh 2651ccd979bdSMark Fasheh mlog_entry_void(); 2652ccd979bdSMark Fasheh 2653ccd979bdSMark Fasheh if (lvb) 2654ccd979bdSMark Fasheh dlm_flags |= LKM_VALBLK; 2655ccd979bdSMark Fasheh 2656ccd979bdSMark Fasheh status = dlmlock(osb->dlm, 2657ccd979bdSMark Fasheh new_level, 2658ccd979bdSMark Fasheh &lockres->l_lksb, 2659ccd979bdSMark Fasheh dlm_flags, 2660ccd979bdSMark Fasheh lockres->l_name, 2661f0681062SMark Fasheh OCFS2_LOCK_ID_MAX_LEN - 1, 2662e92d57dfSMark Fasheh ocfs2_locking_ast, 2663ccd979bdSMark Fasheh lockres, 2664aa2623adSMark Fasheh ocfs2_blocking_ast); 2665ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2666ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmlock", status, lockres); 2667ccd979bdSMark Fasheh ret = -EINVAL; 2668ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 1); 2669ccd979bdSMark Fasheh goto bail; 2670ccd979bdSMark Fasheh } 2671ccd979bdSMark Fasheh 2672ccd979bdSMark Fasheh ret = 0; 2673ccd979bdSMark Fasheh bail: 2674ccd979bdSMark Fasheh mlog_exit(ret); 2675ccd979bdSMark Fasheh return ret; 2676ccd979bdSMark Fasheh } 2677ccd979bdSMark Fasheh 2678ccd979bdSMark Fasheh /* returns 1 when the caller should unlock and call dlmunlock */ 2679ccd979bdSMark Fasheh static int ocfs2_prepare_cancel_convert(struct ocfs2_super *osb, 2680ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 2681ccd979bdSMark Fasheh { 2682ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 2683ccd979bdSMark Fasheh 2684ccd979bdSMark Fasheh mlog_entry_void(); 2685ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2686ccd979bdSMark Fasheh 2687ccd979bdSMark Fasheh if (lockres->l_unlock_action == OCFS2_UNLOCK_CANCEL_CONVERT) { 2688ccd979bdSMark Fasheh /* If we're already trying to cancel a lock conversion 2689ccd979bdSMark Fasheh * then just drop the spinlock and allow the caller to 2690ccd979bdSMark Fasheh * requeue this lock. */ 2691ccd979bdSMark Fasheh 2692ccd979bdSMark Fasheh mlog(0, "Lockres %s, skip convert\n", lockres->l_name); 2693ccd979bdSMark Fasheh return 0; 2694ccd979bdSMark Fasheh } 2695ccd979bdSMark Fasheh 2696ccd979bdSMark Fasheh /* were we in a convert when we got the bast fire? */ 2697ccd979bdSMark Fasheh BUG_ON(lockres->l_action != OCFS2_AST_CONVERT && 2698ccd979bdSMark Fasheh lockres->l_action != OCFS2_AST_DOWNCONVERT); 2699ccd979bdSMark Fasheh /* set things up for the unlockast to know to just 2700ccd979bdSMark Fasheh * clear out the ast_action and unset busy, etc. */ 2701ccd979bdSMark Fasheh lockres->l_unlock_action = OCFS2_UNLOCK_CANCEL_CONVERT; 2702ccd979bdSMark Fasheh 2703ccd979bdSMark Fasheh mlog_bug_on_msg(!(lockres->l_flags & OCFS2_LOCK_BUSY), 2704ccd979bdSMark Fasheh "lock %s, invalid flags: 0x%lx\n", 2705ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 2706ccd979bdSMark Fasheh 2707ccd979bdSMark Fasheh return 1; 2708ccd979bdSMark Fasheh } 2709ccd979bdSMark Fasheh 2710ccd979bdSMark Fasheh static int ocfs2_cancel_convert(struct ocfs2_super *osb, 2711ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 2712ccd979bdSMark Fasheh { 2713ccd979bdSMark Fasheh int ret; 2714ccd979bdSMark Fasheh enum dlm_status status; 2715ccd979bdSMark Fasheh 2716ccd979bdSMark Fasheh mlog_entry_void(); 2717ccd979bdSMark Fasheh mlog(0, "lock %s\n", lockres->l_name); 2718ccd979bdSMark Fasheh 2719ccd979bdSMark Fasheh ret = 0; 2720ccd979bdSMark Fasheh status = dlmunlock(osb->dlm, 2721ccd979bdSMark Fasheh &lockres->l_lksb, 2722ccd979bdSMark Fasheh LKM_CANCEL, 27232a45f2d1SMark Fasheh ocfs2_unlock_ast, 2724ccd979bdSMark Fasheh lockres); 2725ccd979bdSMark Fasheh if (status != DLM_NORMAL) { 2726ccd979bdSMark Fasheh ocfs2_log_dlm_error("dlmunlock", status, lockres); 2727ccd979bdSMark Fasheh ret = -EINVAL; 2728ccd979bdSMark Fasheh ocfs2_recover_from_dlm_error(lockres, 0); 2729ccd979bdSMark Fasheh } 2730ccd979bdSMark Fasheh 2731ccd979bdSMark Fasheh mlog(0, "lock %s return from dlmunlock\n", lockres->l_name); 2732ccd979bdSMark Fasheh 2733ccd979bdSMark Fasheh mlog_exit(ret); 2734ccd979bdSMark Fasheh return ret; 2735ccd979bdSMark Fasheh } 2736ccd979bdSMark Fasheh 2737b5e500e2SMark Fasheh static int ocfs2_unblock_lock(struct ocfs2_super *osb, 2738ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres, 2739cc567d89SMark Fasheh struct ocfs2_unblock_ctl *ctl) 2740ccd979bdSMark Fasheh { 2741ccd979bdSMark Fasheh unsigned long flags; 2742ccd979bdSMark Fasheh int blocking; 2743ccd979bdSMark Fasheh int new_level; 2744ccd979bdSMark Fasheh int ret = 0; 27455ef0d4eaSMark Fasheh int set_lvb = 0; 2746ccd979bdSMark Fasheh 2747ccd979bdSMark Fasheh mlog_entry_void(); 2748ccd979bdSMark Fasheh 2749ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2750ccd979bdSMark Fasheh 2751ccd979bdSMark Fasheh BUG_ON(!(lockres->l_flags & OCFS2_LOCK_BLOCKED)); 2752ccd979bdSMark Fasheh 2753ccd979bdSMark Fasheh recheck: 2754ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_BUSY) { 2755d680efe9SMark Fasheh ctl->requeue = 1; 2756ccd979bdSMark Fasheh ret = ocfs2_prepare_cancel_convert(osb, lockres); 2757ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2758ccd979bdSMark Fasheh if (ret) { 2759ccd979bdSMark Fasheh ret = ocfs2_cancel_convert(osb, lockres); 2760ccd979bdSMark Fasheh if (ret < 0) 2761ccd979bdSMark Fasheh mlog_errno(ret); 2762ccd979bdSMark Fasheh } 2763ccd979bdSMark Fasheh goto leave; 2764ccd979bdSMark Fasheh } 2765ccd979bdSMark Fasheh 2766ccd979bdSMark Fasheh /* if we're blocking an exclusive and we have *any* holders, 2767ccd979bdSMark Fasheh * then requeue. */ 2768ccd979bdSMark Fasheh if ((lockres->l_blocking == LKM_EXMODE) 2769f7fbfdd1SMark Fasheh && (lockres->l_ex_holders || lockres->l_ro_holders)) 2770f7fbfdd1SMark Fasheh goto leave_requeue; 2771ccd979bdSMark Fasheh 2772ccd979bdSMark Fasheh /* If it's a PR we're blocking, then only 2773ccd979bdSMark Fasheh * requeue if we've got any EX holders */ 2774ccd979bdSMark Fasheh if (lockres->l_blocking == LKM_PRMODE && 2775f7fbfdd1SMark Fasheh lockres->l_ex_holders) 2776f7fbfdd1SMark Fasheh goto leave_requeue; 2777f7fbfdd1SMark Fasheh 2778f7fbfdd1SMark Fasheh /* 2779f7fbfdd1SMark Fasheh * Can we get a lock in this state if the holder counts are 2780f7fbfdd1SMark Fasheh * zero? The meta data unblock code used to check this. 2781f7fbfdd1SMark Fasheh */ 2782f7fbfdd1SMark Fasheh if ((lockres->l_ops->flags & LOCK_TYPE_REQUIRES_REFRESH) 2783f7fbfdd1SMark Fasheh && (lockres->l_flags & OCFS2_LOCK_REFRESHING)) 2784f7fbfdd1SMark Fasheh goto leave_requeue; 2785ccd979bdSMark Fasheh 278616d5b956SMark Fasheh new_level = ocfs2_highest_compat_lock_level(lockres->l_blocking); 278716d5b956SMark Fasheh 278816d5b956SMark Fasheh if (lockres->l_ops->check_downconvert 278916d5b956SMark Fasheh && !lockres->l_ops->check_downconvert(lockres, new_level)) 279016d5b956SMark Fasheh goto leave_requeue; 279116d5b956SMark Fasheh 2792ccd979bdSMark Fasheh /* If we get here, then we know that there are no more 2793ccd979bdSMark Fasheh * incompatible holders (and anyone asking for an incompatible 2794ccd979bdSMark Fasheh * lock is blocked). We can now downconvert the lock */ 2795cc567d89SMark Fasheh if (!lockres->l_ops->downconvert_worker) 2796ccd979bdSMark Fasheh goto downconvert; 2797ccd979bdSMark Fasheh 2798ccd979bdSMark Fasheh /* Some lockres types want to do a bit of work before 2799ccd979bdSMark Fasheh * downconverting a lock. Allow that here. The worker function 2800ccd979bdSMark Fasheh * may sleep, so we save off a copy of what we're blocking as 2801ccd979bdSMark Fasheh * it may change while we're not holding the spin lock. */ 2802ccd979bdSMark Fasheh blocking = lockres->l_blocking; 2803ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2804ccd979bdSMark Fasheh 2805cc567d89SMark Fasheh ctl->unblock_action = lockres->l_ops->downconvert_worker(lockres, blocking); 2806d680efe9SMark Fasheh 2807d680efe9SMark Fasheh if (ctl->unblock_action == UNBLOCK_STOP_POST) 2808d680efe9SMark Fasheh goto leave; 2809ccd979bdSMark Fasheh 2810ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2811ccd979bdSMark Fasheh if (blocking != lockres->l_blocking) { 2812ccd979bdSMark Fasheh /* If this changed underneath us, then we can't drop 2813ccd979bdSMark Fasheh * it just yet. */ 2814ccd979bdSMark Fasheh goto recheck; 2815ccd979bdSMark Fasheh } 2816ccd979bdSMark Fasheh 2817ccd979bdSMark Fasheh downconvert: 2818d680efe9SMark Fasheh ctl->requeue = 0; 2819ccd979bdSMark Fasheh 28205ef0d4eaSMark Fasheh if (lockres->l_ops->flags & LOCK_TYPE_USES_LVB) { 28215ef0d4eaSMark Fasheh if (lockres->l_level == LKM_EXMODE) 28225ef0d4eaSMark Fasheh set_lvb = 1; 28235ef0d4eaSMark Fasheh 28245ef0d4eaSMark Fasheh /* 28255ef0d4eaSMark Fasheh * We only set the lvb if the lock has been fully 28265ef0d4eaSMark Fasheh * refreshed - otherwise we risk setting stale 28275ef0d4eaSMark Fasheh * data. Otherwise, there's no need to actually clear 28285ef0d4eaSMark Fasheh * out the lvb here as it's value is still valid. 28295ef0d4eaSMark Fasheh */ 28305ef0d4eaSMark Fasheh if (set_lvb && !(lockres->l_flags & OCFS2_LOCK_NEEDS_REFRESH)) 28315ef0d4eaSMark Fasheh lockres->l_ops->set_lvb(lockres); 28325ef0d4eaSMark Fasheh } 28335ef0d4eaSMark Fasheh 2834ccd979bdSMark Fasheh ocfs2_prepare_downconvert(lockres, new_level); 2835ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 28365ef0d4eaSMark Fasheh ret = ocfs2_downconvert_lock(osb, lockres, new_level, set_lvb); 2837ccd979bdSMark Fasheh leave: 2838ccd979bdSMark Fasheh mlog_exit(ret); 2839ccd979bdSMark Fasheh return ret; 2840f7fbfdd1SMark Fasheh 2841f7fbfdd1SMark Fasheh leave_requeue: 2842f7fbfdd1SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2843f7fbfdd1SMark Fasheh ctl->requeue = 1; 2844f7fbfdd1SMark Fasheh 2845f7fbfdd1SMark Fasheh mlog_exit(0); 2846f7fbfdd1SMark Fasheh return 0; 2847ccd979bdSMark Fasheh } 2848ccd979bdSMark Fasheh 2849d680efe9SMark Fasheh static int ocfs2_data_convert_worker(struct ocfs2_lock_res *lockres, 2850ccd979bdSMark Fasheh int blocking) 2851ccd979bdSMark Fasheh { 2852ccd979bdSMark Fasheh struct inode *inode; 2853ccd979bdSMark Fasheh struct address_space *mapping; 2854ccd979bdSMark Fasheh 2855ccd979bdSMark Fasheh inode = ocfs2_lock_res_inode(lockres); 2856ccd979bdSMark Fasheh mapping = inode->i_mapping; 2857ccd979bdSMark Fasheh 28587f4a2a97SMark Fasheh /* 28597f4a2a97SMark Fasheh * We need this before the filemap_fdatawrite() so that it can 28607f4a2a97SMark Fasheh * transfer the dirty bit from the PTE to the 28617f4a2a97SMark Fasheh * page. Unfortunately this means that even for EX->PR 28627f4a2a97SMark Fasheh * downconverts, we'll lose our mappings and have to build 28637f4a2a97SMark Fasheh * them up again. 28647f4a2a97SMark Fasheh */ 28657f4a2a97SMark Fasheh unmap_mapping_range(mapping, 0, 0, 0); 28667f4a2a97SMark Fasheh 2867ccd979bdSMark Fasheh if (filemap_fdatawrite(mapping)) { 2868b0697053SMark Fasheh mlog(ML_ERROR, "Could not sync inode %llu for downconvert!", 2869b0697053SMark Fasheh (unsigned long long)OCFS2_I(inode)->ip_blkno); 2870ccd979bdSMark Fasheh } 2871ccd979bdSMark Fasheh sync_mapping_buffers(mapping); 2872ccd979bdSMark Fasheh if (blocking == LKM_EXMODE) { 2873ccd979bdSMark Fasheh truncate_inode_pages(mapping, 0); 2874ccd979bdSMark Fasheh } else { 2875ccd979bdSMark Fasheh /* We only need to wait on the I/O if we're not also 2876ccd979bdSMark Fasheh * truncating pages because truncate_inode_pages waits 2877ccd979bdSMark Fasheh * for us above. We don't truncate pages if we're 2878ccd979bdSMark Fasheh * blocking anything < EXMODE because we want to keep 2879ccd979bdSMark Fasheh * them around in that case. */ 2880ccd979bdSMark Fasheh filemap_fdatawait(mapping); 2881ccd979bdSMark Fasheh } 2882ccd979bdSMark Fasheh 2883d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2884ccd979bdSMark Fasheh } 2885ccd979bdSMark Fasheh 2886810d5aebSMark Fasheh static int ocfs2_check_meta_downconvert(struct ocfs2_lock_res *lockres, 2887810d5aebSMark Fasheh int new_level) 2888810d5aebSMark Fasheh { 2889810d5aebSMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 2890810d5aebSMark Fasheh int checkpointed = ocfs2_inode_fully_checkpointed(inode); 2891810d5aebSMark Fasheh 2892810d5aebSMark Fasheh BUG_ON(new_level != LKM_NLMODE && new_level != LKM_PRMODE); 2893810d5aebSMark Fasheh BUG_ON(lockres->l_level != LKM_EXMODE && !checkpointed); 2894810d5aebSMark Fasheh 2895810d5aebSMark Fasheh if (checkpointed) 2896810d5aebSMark Fasheh return 1; 2897810d5aebSMark Fasheh 2898810d5aebSMark Fasheh ocfs2_start_checkpoint(OCFS2_SB(inode->i_sb)); 2899810d5aebSMark Fasheh return 0; 2900810d5aebSMark Fasheh } 2901810d5aebSMark Fasheh 2902810d5aebSMark Fasheh static void ocfs2_set_meta_lvb(struct ocfs2_lock_res *lockres) 2903810d5aebSMark Fasheh { 2904810d5aebSMark Fasheh struct inode *inode = ocfs2_lock_res_inode(lockres); 2905810d5aebSMark Fasheh 2906810d5aebSMark Fasheh __ocfs2_stuff_meta_lvb(inode); 2907810d5aebSMark Fasheh } 2908810d5aebSMark Fasheh 2909d680efe9SMark Fasheh /* 2910d680efe9SMark Fasheh * Does the final reference drop on our dentry lock. Right now this 2911d680efe9SMark Fasheh * happens in the vote thread, but we could choose to simplify the 2912d680efe9SMark Fasheh * dlmglue API and push these off to the ocfs2_wq in the future. 2913d680efe9SMark Fasheh */ 2914d680efe9SMark Fasheh static void ocfs2_dentry_post_unlock(struct ocfs2_super *osb, 2915d680efe9SMark Fasheh struct ocfs2_lock_res *lockres) 2916d680efe9SMark Fasheh { 2917d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2918d680efe9SMark Fasheh ocfs2_dentry_lock_put(osb, dl); 2919d680efe9SMark Fasheh } 2920d680efe9SMark Fasheh 2921d680efe9SMark Fasheh /* 2922d680efe9SMark Fasheh * d_delete() matching dentries before the lock downconvert. 2923d680efe9SMark Fasheh * 2924d680efe9SMark Fasheh * At this point, any process waiting to destroy the 2925d680efe9SMark Fasheh * dentry_lock due to last ref count is stopped by the 2926d680efe9SMark Fasheh * OCFS2_LOCK_QUEUED flag. 2927d680efe9SMark Fasheh * 2928d680efe9SMark Fasheh * We have two potential problems 2929d680efe9SMark Fasheh * 2930d680efe9SMark Fasheh * 1) If we do the last reference drop on our dentry_lock (via dput) 2931d680efe9SMark Fasheh * we'll wind up in ocfs2_release_dentry_lock(), waiting on 2932d680efe9SMark Fasheh * the downconvert to finish. Instead we take an elevated 2933d680efe9SMark Fasheh * reference and push the drop until after we've completed our 2934d680efe9SMark Fasheh * unblock processing. 2935d680efe9SMark Fasheh * 2936d680efe9SMark Fasheh * 2) There might be another process with a final reference, 2937d680efe9SMark Fasheh * waiting on us to finish processing. If this is the case, we 2938d680efe9SMark Fasheh * detect it and exit out - there's no more dentries anyway. 2939d680efe9SMark Fasheh */ 2940d680efe9SMark Fasheh static int ocfs2_dentry_convert_worker(struct ocfs2_lock_res *lockres, 2941d680efe9SMark Fasheh int blocking) 2942d680efe9SMark Fasheh { 2943d680efe9SMark Fasheh struct ocfs2_dentry_lock *dl = ocfs2_lock_res_dl(lockres); 2944d680efe9SMark Fasheh struct ocfs2_inode_info *oi = OCFS2_I(dl->dl_inode); 2945d680efe9SMark Fasheh struct dentry *dentry; 2946d680efe9SMark Fasheh unsigned long flags; 2947d680efe9SMark Fasheh int extra_ref = 0; 2948d680efe9SMark Fasheh 2949d680efe9SMark Fasheh /* 2950d680efe9SMark Fasheh * This node is blocking another node from getting a read 2951d680efe9SMark Fasheh * lock. This happens when we've renamed within a 2952d680efe9SMark Fasheh * directory. We've forced the other nodes to d_delete(), but 2953d680efe9SMark Fasheh * we never actually dropped our lock because it's still 2954d680efe9SMark Fasheh * valid. The downconvert code will retain a PR for this node, 2955d680efe9SMark Fasheh * so there's no further work to do. 2956d680efe9SMark Fasheh */ 2957d680efe9SMark Fasheh if (blocking == LKM_PRMODE) 2958d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2959d680efe9SMark Fasheh 2960d680efe9SMark Fasheh /* 2961d680efe9SMark Fasheh * Mark this inode as potentially orphaned. The code in 2962d680efe9SMark Fasheh * ocfs2_delete_inode() will figure out whether it actually 2963d680efe9SMark Fasheh * needs to be freed or not. 2964d680efe9SMark Fasheh */ 2965d680efe9SMark Fasheh spin_lock(&oi->ip_lock); 2966d680efe9SMark Fasheh oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED; 2967d680efe9SMark Fasheh spin_unlock(&oi->ip_lock); 2968d680efe9SMark Fasheh 2969d680efe9SMark Fasheh /* 2970d680efe9SMark Fasheh * Yuck. We need to make sure however that the check of 2971d680efe9SMark Fasheh * OCFS2_LOCK_FREEING and the extra reference are atomic with 2972d680efe9SMark Fasheh * respect to a reference decrement or the setting of that 2973d680efe9SMark Fasheh * flag. 2974d680efe9SMark Fasheh */ 2975d680efe9SMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 2976d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 2977d680efe9SMark Fasheh if (!(lockres->l_flags & OCFS2_LOCK_FREEING) 2978d680efe9SMark Fasheh && dl->dl_count) { 2979d680efe9SMark Fasheh dl->dl_count++; 2980d680efe9SMark Fasheh extra_ref = 1; 2981d680efe9SMark Fasheh } 2982d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 2983d680efe9SMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 2984d680efe9SMark Fasheh 2985d680efe9SMark Fasheh mlog(0, "extra_ref = %d\n", extra_ref); 2986d680efe9SMark Fasheh 2987d680efe9SMark Fasheh /* 2988d680efe9SMark Fasheh * We have a process waiting on us in ocfs2_dentry_iput(), 2989d680efe9SMark Fasheh * which means we can't have any more outstanding 2990d680efe9SMark Fasheh * aliases. There's no need to do any more work. 2991d680efe9SMark Fasheh */ 2992d680efe9SMark Fasheh if (!extra_ref) 2993d680efe9SMark Fasheh return UNBLOCK_CONTINUE; 2994d680efe9SMark Fasheh 2995d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 2996d680efe9SMark Fasheh while (1) { 2997d680efe9SMark Fasheh dentry = ocfs2_find_local_alias(dl->dl_inode, 2998d680efe9SMark Fasheh dl->dl_parent_blkno, 1); 2999d680efe9SMark Fasheh if (!dentry) 3000d680efe9SMark Fasheh break; 3001d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 3002d680efe9SMark Fasheh 3003d680efe9SMark Fasheh mlog(0, "d_delete(%.*s);\n", dentry->d_name.len, 3004d680efe9SMark Fasheh dentry->d_name.name); 3005d680efe9SMark Fasheh 3006d680efe9SMark Fasheh /* 3007d680efe9SMark Fasheh * The following dcache calls may do an 3008d680efe9SMark Fasheh * iput(). Normally we don't want that from the 3009d680efe9SMark Fasheh * downconverting thread, but in this case it's ok 3010d680efe9SMark Fasheh * because the requesting node already has an 3011d680efe9SMark Fasheh * exclusive lock on the inode, so it can't be queued 3012d680efe9SMark Fasheh * for a downconvert. 3013d680efe9SMark Fasheh */ 3014d680efe9SMark Fasheh d_delete(dentry); 3015d680efe9SMark Fasheh dput(dentry); 3016d680efe9SMark Fasheh 3017d680efe9SMark Fasheh spin_lock(&dentry_attach_lock); 3018d680efe9SMark Fasheh } 3019d680efe9SMark Fasheh spin_unlock(&dentry_attach_lock); 3020d680efe9SMark Fasheh 3021d680efe9SMark Fasheh /* 3022d680efe9SMark Fasheh * If we are the last holder of this dentry lock, there is no 3023d680efe9SMark Fasheh * reason to downconvert so skip straight to the unlock. 3024d680efe9SMark Fasheh */ 3025d680efe9SMark Fasheh if (dl->dl_count == 1) 3026d680efe9SMark Fasheh return UNBLOCK_STOP_POST; 3027d680efe9SMark Fasheh 3028d680efe9SMark Fasheh return UNBLOCK_CONTINUE_POST; 3029d680efe9SMark Fasheh } 3030d680efe9SMark Fasheh 3031ccd979bdSMark Fasheh void ocfs2_process_blocked_lock(struct ocfs2_super *osb, 3032ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 3033ccd979bdSMark Fasheh { 3034ccd979bdSMark Fasheh int status; 3035d680efe9SMark Fasheh struct ocfs2_unblock_ctl ctl = {0, 0,}; 3036ccd979bdSMark Fasheh unsigned long flags; 3037ccd979bdSMark Fasheh 3038ccd979bdSMark Fasheh /* Our reference to the lockres in this function can be 3039ccd979bdSMark Fasheh * considered valid until we remove the OCFS2_LOCK_QUEUED 3040ccd979bdSMark Fasheh * flag. */ 3041ccd979bdSMark Fasheh 3042ccd979bdSMark Fasheh mlog_entry_void(); 3043ccd979bdSMark Fasheh 3044ccd979bdSMark Fasheh BUG_ON(!lockres); 3045ccd979bdSMark Fasheh BUG_ON(!lockres->l_ops); 3046ccd979bdSMark Fasheh 3047ccd979bdSMark Fasheh mlog(0, "lockres %s blocked.\n", lockres->l_name); 3048ccd979bdSMark Fasheh 3049ccd979bdSMark Fasheh /* Detect whether a lock has been marked as going away while 3050ccd979bdSMark Fasheh * the vote thread was processing other things. A lock can 3051ccd979bdSMark Fasheh * still be marked with OCFS2_LOCK_FREEING after this check, 3052ccd979bdSMark Fasheh * but short circuiting here will still save us some 3053ccd979bdSMark Fasheh * performance. */ 3054ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 3055ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING) 3056ccd979bdSMark Fasheh goto unqueue; 3057ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 3058ccd979bdSMark Fasheh 3059b5e500e2SMark Fasheh status = ocfs2_unblock_lock(osb, lockres, &ctl); 3060ccd979bdSMark Fasheh if (status < 0) 3061ccd979bdSMark Fasheh mlog_errno(status); 3062ccd979bdSMark Fasheh 3063ccd979bdSMark Fasheh spin_lock_irqsave(&lockres->l_lock, flags); 3064ccd979bdSMark Fasheh unqueue: 3065d680efe9SMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING || !ctl.requeue) { 3066ccd979bdSMark Fasheh lockres_clear_flags(lockres, OCFS2_LOCK_QUEUED); 3067ccd979bdSMark Fasheh } else 3068ccd979bdSMark Fasheh ocfs2_schedule_blocked_lock(osb, lockres); 3069ccd979bdSMark Fasheh 3070ccd979bdSMark Fasheh mlog(0, "lockres %s, requeue = %s.\n", lockres->l_name, 3071d680efe9SMark Fasheh ctl.requeue ? "yes" : "no"); 3072ccd979bdSMark Fasheh spin_unlock_irqrestore(&lockres->l_lock, flags); 3073ccd979bdSMark Fasheh 3074d680efe9SMark Fasheh if (ctl.unblock_action != UNBLOCK_CONTINUE 3075d680efe9SMark Fasheh && lockres->l_ops->post_unlock) 3076d680efe9SMark Fasheh lockres->l_ops->post_unlock(osb, lockres); 3077d680efe9SMark Fasheh 3078ccd979bdSMark Fasheh mlog_exit_void(); 3079ccd979bdSMark Fasheh } 3080ccd979bdSMark Fasheh 3081ccd979bdSMark Fasheh static void ocfs2_schedule_blocked_lock(struct ocfs2_super *osb, 3082ccd979bdSMark Fasheh struct ocfs2_lock_res *lockres) 3083ccd979bdSMark Fasheh { 3084ccd979bdSMark Fasheh mlog_entry_void(); 3085ccd979bdSMark Fasheh 3086ccd979bdSMark Fasheh assert_spin_locked(&lockres->l_lock); 3087ccd979bdSMark Fasheh 3088ccd979bdSMark Fasheh if (lockres->l_flags & OCFS2_LOCK_FREEING) { 3089ccd979bdSMark Fasheh /* Do not schedule a lock for downconvert when it's on 3090ccd979bdSMark Fasheh * the way to destruction - any nodes wanting access 3091ccd979bdSMark Fasheh * to the resource will get it soon. */ 3092ccd979bdSMark Fasheh mlog(0, "Lockres %s won't be scheduled: flags 0x%lx\n", 3093ccd979bdSMark Fasheh lockres->l_name, lockres->l_flags); 3094ccd979bdSMark Fasheh return; 3095ccd979bdSMark Fasheh } 3096ccd979bdSMark Fasheh 3097ccd979bdSMark Fasheh lockres_or_flags(lockres, OCFS2_LOCK_QUEUED); 3098ccd979bdSMark Fasheh 3099ccd979bdSMark Fasheh spin_lock(&osb->vote_task_lock); 3100ccd979bdSMark Fasheh if (list_empty(&lockres->l_blocked_list)) { 3101ccd979bdSMark Fasheh list_add_tail(&lockres->l_blocked_list, 3102ccd979bdSMark Fasheh &osb->blocked_lock_list); 3103ccd979bdSMark Fasheh osb->blocked_lock_count++; 3104ccd979bdSMark Fasheh } 3105ccd979bdSMark Fasheh spin_unlock(&osb->vote_task_lock); 3106ccd979bdSMark Fasheh 3107ccd979bdSMark Fasheh mlog_exit_void(); 3108ccd979bdSMark Fasheh } 3109