| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mark Fasheh | 5838 | 55.95% | 5 | 4.42% |
| Sunil Mushran | 2730 | 26.16% | 27 | 23.89% |
| Junxiao Bi | 644 | 6.17% | 8 | 7.08% |
| Joel Becker | 282 | 2.70% | 7 | 6.19% |
| Christoph Hellwig | 277 | 2.65% | 9 | 7.96% |
| Joseph Qi | 126 | 1.21% | 5 | 4.42% |
| Jan Kara | 104 | 1.00% | 3 | 2.65% |
| Philipp Reisner | 79 | 0.76% | 1 | 0.88% |
| Jiufei (Joyce) Xue | 51 | 0.49% | 2 | 1.77% |
| Jia Guo | 46 | 0.44% | 1 | 0.88% |
| Jiri Slaby | 27 | 0.26% | 1 | 0.88% |
| David Howells | 26 | 0.25% | 1 | 0.88% |
| Zhen Wei | 24 | 0.23% | 1 | 0.88% |
| Greg Kroah-Hartman | 22 | 0.21% | 2 | 1.77% |
| Al Viro | 21 | 0.20% | 2 | 1.77% |
| Tina Ruchandani | 18 | 0.17% | 1 | 0.88% |
| Dong Fang | 14 | 0.13% | 1 | 0.88% |
| Kurt Hackel | 13 | 0.12% | 2 | 1.77% |
| Akinobu Mita | 10 | 0.10% | 2 | 1.77% |
| Chen Huang | 9 | 0.09% | 1 | 0.88% |
| Dan Carpenter | 9 | 0.09% | 1 | 0.88% |
| Colin Ian King | 5 | 0.05% | 1 | 0.88% |
| Michael Christie | 5 | 0.05% | 2 | 1.77% |
| Kirill A. Shutemov | 5 | 0.05% | 1 | 0.88% |
| Takashi Iwai | 5 | 0.05% | 1 | 0.88% |
| Ingo Molnar | 4 | 0.04% | 1 | 0.88% |
| Bart Van Assche | 4 | 0.04% | 1 | 0.88% |
| Yiwen Jiang | 4 | 0.04% | 1 | 0.88% |
| Tejun Heo | 4 | 0.04% | 2 | 1.77% |
| Pavel Emelyanov | 3 | 0.03% | 1 | 0.88% |
| Robert P. J. Day | 2 | 0.02% | 1 | 0.88% |
| Deepa Dinamani | 2 | 0.02% | 1 | 0.88% |
| Bhumika Goyal | 2 | 0.02% | 1 | 0.88% |
| Tao Ma | 2 | 0.02% | 1 | 0.88% |
| Linus Torvalds (pre-git) | 2 | 0.02% | 1 | 0.88% |
| Kent Overstreet | 2 | 0.02% | 1 | 0.88% |
| Jie Liu | 2 | 0.02% | 1 | 0.88% |
| Mathieu Avila | 1 | 0.01% | 1 | 0.88% |
| Changwei Ge | 1 | 0.01% | 1 | 0.88% |
| Thomas Gleixner | 1 | 0.01% | 1 | 0.88% |
| Rasmus Villemoes | 1 | 0.01% | 1 | 0.88% |
| Martin K. Petersen | 1 | 0.01% | 1 | 0.88% |
| Alexey Dobriyan | 1 | 0.01% | 1 | 0.88% |
| Yury Norov | 1 | 0.01% | 1 | 0.88% |
| Dongsheng Yang | 1 | 0.01% | 1 | 0.88% |
| Lucas De Marchi | 1 | 0.01% | 1 | 0.88% |
| Frederik Schwarzer | 1 | 0.01% | 1 | 0.88% |
| Masahiro Yamada | 1 | 0.01% | 1 | 0.88% |
| Linus Torvalds | 1 | 0.01% | 1 | 0.88% |
| Total | 10435 | 113 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2004, 2005 Oracle. All rights reserved. */ #include <linux/kernel.h> #include <linux/sched.h> #include <linux/jiffies.h> #include <linux/module.h> #include <linux/fs.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/file.h> #include <linux/kthread.h> #include <linux/configfs.h> #include <linux/random.h> #include <linux/crc32.h> #include <linux/time.h> #include <linux/debugfs.h> #include <linux/slab.h> #include <linux/bitmap.h> #include <linux/ktime.h> #include "heartbeat.h" #include "tcp.h" #include "nodemanager.h" #include "quorum.h" #include "masklog.h" /* * The first heartbeat pass had one global thread that would serialize all hb * callback calls. This global serializing sem should only be removed once * we've made sure that all callees can deal with being called concurrently * from multiple hb region threads. */ static DECLARE_RWSEM(o2hb_callback_sem); /* * multiple hb threads are watching multiple regions. A node is live * whenever any of the threads sees activity from the node in its region. */ static DEFINE_SPINLOCK(o2hb_live_lock); static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; static LIST_HEAD(o2hb_node_events); static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); /* * In global heartbeat, we maintain a series of region bitmaps. * - o2hb_region_bitmap allows us to limit the region number to max region. * - o2hb_live_region_bitmap tracks live regions (seen steady iterations). * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes * heartbeat on it. * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts. */ static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; #define O2HB_DB_TYPE_LIVENODES 0 #define O2HB_DB_TYPE_LIVEREGIONS 1 #define O2HB_DB_TYPE_QUORUMREGIONS 2 #define O2HB_DB_TYPE_FAILEDREGIONS 3 #define O2HB_DB_TYPE_REGION_LIVENODES 4 #define O2HB_DB_TYPE_REGION_NUMBER 5 #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6 #define O2HB_DB_TYPE_REGION_PINNED 7 struct o2hb_debug_buf { int db_type; int db_size; int db_len; void *db_data; }; static struct o2hb_debug_buf *o2hb_db_livenodes; static struct o2hb_debug_buf *o2hb_db_liveregions; static struct o2hb_debug_buf *o2hb_db_quorumregions; static struct o2hb_debug_buf *o2hb_db_failedregions; #define O2HB_DEBUG_DIR "o2hb" #define O2HB_DEBUG_LIVENODES "livenodes" #define O2HB_DEBUG_LIVEREGIONS "live_regions" #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions" #define O2HB_DEBUG_FAILEDREGIONS "failed_regions" #define O2HB_DEBUG_REGION_NUMBER "num" #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms" #define O2HB_DEBUG_REGION_PINNED "pinned" static struct dentry *o2hb_debug_dir; static LIST_HEAD(o2hb_all_regions); static struct o2hb_callback { struct list_head list; } o2hb_callbacks[O2HB_NUM_CB]; static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); enum o2hb_heartbeat_modes { O2HB_HEARTBEAT_LOCAL = 0, O2HB_HEARTBEAT_GLOBAL, O2HB_HEARTBEAT_NUM_MODES, }; static const char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = { "local", /* O2HB_HEARTBEAT_LOCAL */ "global", /* O2HB_HEARTBEAT_GLOBAL */ }; unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; static unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL; /* * o2hb_dependent_users tracks the number of registered callbacks that depend * on heartbeat. o2net and o2dlm are two entities that register this callback. * However only o2dlm depends on the heartbeat. It does not want the heartbeat * to stop while a dlm domain is still active. */ static unsigned int o2hb_dependent_users; /* * In global heartbeat mode, all regions are pinned if there are one or more * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All * regions are unpinned if the region count exceeds the cut off or the number * of dependent users falls to zero. */ #define O2HB_PIN_CUT_OFF 3 /* * In local heartbeat mode, we assume the dlm domain name to be the same as * region uuid. This is true for domains created for the file system but not * necessarily true for userdlm domains. This is a known limitation. * * In global heartbeat mode, we pin/unpin all o2hb regions. This solution * works for both file system and userdlm domains. */ static int o2hb_region_pin(const char *region_uuid); static void o2hb_region_unpin(const char *region_uuid); /* Only sets a new threshold if there are no active regions. * * No locking or otherwise interesting code is required for reading * o2hb_dead_threshold as it can't change once regions are active and * it's not interesting to anyone until then anyway. */ static void o2hb_dead_threshold_set(unsigned int threshold) { if (threshold > O2HB_MIN_DEAD_THRESHOLD) { spin_lock(&o2hb_live_lock); if (list_empty(&o2hb_all_regions)) o2hb_dead_threshold = threshold; spin_unlock(&o2hb_live_lock); } } static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode) { int ret = -1; if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) { spin_lock(&o2hb_live_lock); if (list_empty(&o2hb_all_regions)) { o2hb_heartbeat_mode = hb_mode; ret = 0; } spin_unlock(&o2hb_live_lock); } return ret; } struct o2hb_node_event { struct list_head hn_item; enum o2hb_callback_type hn_event_type; struct o2nm_node *hn_node; int hn_node_num; }; struct o2hb_disk_slot { struct o2hb_disk_heartbeat_block *ds_raw_block; u8 ds_node_num; u64 ds_last_time; u64 ds_last_generation; u16 ds_equal_samples; u16 ds_changed_samples; struct list_head ds_live_item; }; /* each thread owns a region.. when we're asked to tear down the region * we ask the thread to stop, who cleans up the region */ struct o2hb_region { struct config_item hr_item; struct list_head hr_all_item; unsigned hr_unclean_stop:1, hr_aborted_start:1, hr_item_pinned:1, hr_item_dropped:1, hr_node_deleted:1; /* protected by the hr_callback_sem */ struct task_struct *hr_task; unsigned int hr_blocks; unsigned long long hr_start_block; unsigned int hr_block_bits; unsigned int hr_block_bytes; unsigned int hr_slots_per_page; unsigned int hr_num_pages; struct page **hr_slot_data; struct bdev_handle *hr_bdev_handle; struct o2hb_disk_slot *hr_slots; /* live node map of this region */ unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; unsigned int hr_region_num; struct dentry *hr_debug_dir; struct o2hb_debug_buf *hr_db_livenodes; struct o2hb_debug_buf *hr_db_regnum; struct o2hb_debug_buf *hr_db_elapsed_time; struct o2hb_debug_buf *hr_db_pinned; /* let the person setting up hb wait for it to return until it * has reached a 'steady' state. This will be fixed when we have * a more complete api that doesn't lead to this sort of fragility. */ atomic_t hr_steady_iterations; /* terminate o2hb thread if it does not reach steady state * (hr_steady_iterations == 0) within hr_unsteady_iterations */ atomic_t hr_unsteady_iterations; unsigned int hr_timeout_ms; /* randomized as the region goes up and down so that a node * recognizes a node going up and down in one iteration */ u64 hr_generation; struct delayed_work hr_write_timeout_work; unsigned long hr_last_timeout_start; /* negotiate timer, used to negotiate extending hb timeout. */ struct delayed_work hr_nego_timeout_work; unsigned long hr_nego_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; /* Used during o2hb_check_slot to hold a copy of the block * being checked because we temporarily have to zero out the * crc field. */ struct o2hb_disk_heartbeat_block *hr_tmp_block; /* Message key for negotiate timeout message. */ unsigned int hr_key; struct list_head hr_handler_list; /* last hb status, 0 for success, other value for error. */ int hr_last_hb_status; }; static inline struct block_device *reg_bdev(struct o2hb_region *reg) { return reg->hr_bdev_handle ? reg->hr_bdev_handle->bdev : NULL; } struct o2hb_bio_wait_ctxt { atomic_t wc_num_reqs; struct completion wc_io_complete; int wc_error; }; #define O2HB_NEGO_TIMEOUT_MS (O2HB_MAX_WRITE_TIMEOUT_MS/2) enum { O2HB_NEGO_TIMEOUT_MSG = 1, O2HB_NEGO_APPROVE_MSG = 2, }; struct o2hb_nego_msg { u8 node_num; }; static void o2hb_write_timeout(struct work_struct *work) { int failed, quorum; struct o2hb_region *reg = container_of(work, struct o2hb_region, hr_write_timeout_work.work); mlog(ML_ERROR, "Heartbeat write timeout to device %pg after %u " "milliseconds\n", reg_bdev(reg), jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); if (o2hb_global_heartbeat_active()) { spin_lock(&o2hb_live_lock); if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); failed = bitmap_weight(o2hb_failed_region_bitmap, O2NM_MAX_REGIONS); quorum = bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS); spin_unlock(&o2hb_live_lock); mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", quorum, failed); /* * Fence if the number of failed regions >= half the number * of quorum regions */ if ((failed << 1) < quorum) return; } o2quo_disk_timeout(); } static void o2hb_arm_timeout(struct o2hb_region *reg) { /* Arm writeout only after thread reaches steady state */ if (atomic_read(®->hr_steady_iterations) != 0) return; mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS); if (o2hb_global_heartbeat_active()) { spin_lock(&o2hb_live_lock); clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); spin_unlock(&o2hb_live_lock); } cancel_delayed_work(®->hr_write_timeout_work); schedule_delayed_work(®->hr_write_timeout_work, msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); cancel_delayed_work(®->hr_nego_timeout_work); /* negotiate timeout must be less than write timeout. */ schedule_delayed_work(®->hr_nego_timeout_work, msecs_to_jiffies(O2HB_NEGO_TIMEOUT_MS)); bitmap_zero(reg->hr_nego_node_bitmap, O2NM_MAX_NODES); } static void o2hb_disarm_timeout(struct o2hb_region *reg) { cancel_delayed_work_sync(®->hr_write_timeout_work); cancel_delayed_work_sync(®->hr_nego_timeout_work); } static int o2hb_send_nego_msg(int key, int type, u8 target) { struct o2hb_nego_msg msg; int status, ret; msg.node_num = o2nm_this_node(); again: ret = o2net_send_message(type, key, &msg, sizeof(msg), target, &status); if (ret == -EAGAIN || ret == -ENOMEM) { msleep(100); goto again; } return ret; } static void o2hb_nego_timeout(struct work_struct *work) { unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; int master_node, i, ret; struct o2hb_region *reg; reg = container_of(work, struct o2hb_region, hr_nego_timeout_work.work); /* don't negotiate timeout if last hb failed since it is very * possible io failed. Should let write timeout fence self. */ if (reg->hr_last_hb_status) return; o2hb_fill_node_map(live_node_bitmap, O2NM_MAX_NODES); /* lowest node as master node to make negotiate decision. */ master_node = find_first_bit(live_node_bitmap, O2NM_MAX_NODES); if (master_node == o2nm_this_node()) { if (!test_bit(master_node, reg->hr_nego_node_bitmap)) { printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%pg).\n", o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item), reg_bdev(reg)); set_bit(master_node, reg->hr_nego_node_bitmap); } if (!bitmap_equal(reg->hr_nego_node_bitmap, live_node_bitmap, O2NM_MAX_NODES)) { /* check negotiate bitmap every second to do timeout * approve decision. */ schedule_delayed_work(®->hr_nego_timeout_work, msecs_to_jiffies(1000)); return; } printk(KERN_NOTICE "o2hb: all nodes hb write hung, maybe region %s (%pg) is down.\n", config_item_name(®->hr_item), reg_bdev(reg)); /* approve negotiate timeout request. */ o2hb_arm_timeout(reg); i = -1; while ((i = find_next_bit(live_node_bitmap, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { if (i == master_node) continue; mlog(ML_HEARTBEAT, "send NEGO_APPROVE msg to node %d\n", i); ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_APPROVE_MSG, i); if (ret) mlog(ML_ERROR, "send NEGO_APPROVE msg to node %d fail %d\n", i, ret); } } else { /* negotiate timeout with master node. */ printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%pg), negotiate timeout with node %d.\n", o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item), reg_bdev(reg), master_node); ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG, master_node); if (ret) mlog(ML_ERROR, "send NEGO_TIMEOUT msg to node %d fail %d\n", master_node, ret); } } static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data, void **ret_data) { struct o2hb_region *reg = data; struct o2hb_nego_msg *nego_msg; nego_msg = (struct o2hb_nego_msg *)msg->buf; printk(KERN_NOTICE "o2hb: receive negotiate timeout message from node %d on region %s (%pg).\n", nego_msg->node_num, config_item_name(®->hr_item), reg_bdev(reg)); if (nego_msg->node_num < O2NM_MAX_NODES) set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap); else mlog(ML_ERROR, "got nego timeout message from bad node.\n"); return 0; } static int o2hb_nego_approve_handler(struct o2net_msg *msg, u32 len, void *data, void **ret_data) { struct o2hb_region *reg = data; printk(KERN_NOTICE "o2hb: negotiate timeout approved by master node on region %s (%pg).\n", config_item_name(®->hr_item), reg_bdev(reg)); o2hb_arm_timeout(reg); return 0; } static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) { atomic_set(&wc->wc_num_reqs, 1); init_completion(&wc->wc_io_complete); wc->wc_error = 0; } /* Used in error paths too */ static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, unsigned int num) { /* sadly atomic_sub_and_test() isn't available on all platforms. The * good news is that the fast path only completes one at a time */ while(num--) { if (atomic_dec_and_test(&wc->wc_num_reqs)) { BUG_ON(num > 0); complete(&wc->wc_io_complete); } } } static void o2hb_wait_on_io(struct o2hb_bio_wait_ctxt *wc) { o2hb_bio_wait_dec(wc, 1); wait_for_completion(&wc->wc_io_complete); } static void o2hb_bio_end_io(struct bio *bio) { struct o2hb_bio_wait_ctxt *wc = bio->bi_private; if (bio->bi_status) { mlog(ML_ERROR, "IO Error %d\n", bio->bi_status); wc->wc_error = blk_status_to_errno(bio->bi_status); } o2hb_bio_wait_dec(wc, 1); bio_put(bio); } /* Setup a Bio to cover I/O against num_slots slots starting at * start_slot. */ static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, struct o2hb_bio_wait_ctxt *wc, unsigned int *current_slot, unsigned int max_slots, blk_opf_t opf) { int len, current_page; unsigned int vec_len, vec_start; unsigned int bits = reg->hr_block_bits; unsigned int spp = reg->hr_slots_per_page; unsigned int cs = *current_slot; struct bio *bio; struct page *page; /* Testing has shown this allocation to take long enough under * GFP_KERNEL that the local node can get fenced. It would be * nicest if we could pre-allocate these bios and avoid this * all together. */ bio = bio_alloc(reg_bdev(reg), 16, opf, GFP_ATOMIC); if (!bio) { mlog(ML_ERROR, "Could not alloc slots BIO!\n"); bio = ERR_PTR(-ENOMEM); goto bail; } /* Must put everything in 512 byte sectors for the bio... */ bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9); bio->bi_private = wc; bio->bi_end_io = o2hb_bio_end_io; vec_start = (cs << bits) % PAGE_SIZE; while(cs < max_slots) { current_page = cs / spp; page = reg->hr_slot_data[current_page]; vec_len = min(PAGE_SIZE - vec_start, (max_slots-cs) * (PAGE_SIZE/spp) ); mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", current_page, vec_len, vec_start); len = bio_add_page(bio, page, vec_len, vec_start); if (len != vec_len) break; cs += vec_len / (PAGE_SIZE/spp); vec_start = 0; } bail: *current_slot = cs; return bio; } static int o2hb_read_slots(struct o2hb_region *reg, unsigned int begin_slot, unsigned int max_slots) { unsigned int current_slot = begin_slot; int status; struct o2hb_bio_wait_ctxt wc; struct bio *bio; o2hb_bio_wait_init(&wc); while(current_slot < max_slots) { bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots, REQ_OP_READ); if (IS_ERR(bio)) { status = PTR_ERR(bio); mlog_errno(status); goto bail_and_wait; } atomic_inc(&wc.wc_num_reqs); submit_bio(bio); } status = 0; bail_and_wait: o2hb_wait_on_io(&wc); if (wc.wc_error && !status) status = wc.wc_error; return status; } static int o2hb_issue_node_write(struct o2hb_region *reg, struct o2hb_bio_wait_ctxt *write_wc) { int status; unsigned int slot; struct bio *bio; o2hb_bio_wait_init(write_wc); slot = o2nm_this_node(); bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1, REQ_OP_WRITE | REQ_SYNC); if (IS_ERR(bio)) { status = PTR_ERR(bio); mlog_errno(status); goto bail; } atomic_inc(&write_wc->wc_num_reqs); submit_bio(bio); status = 0; bail: return status; } static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, struct o2hb_disk_heartbeat_block *hb_block) { __le32 old_cksum; u32 ret; /* We want to compute the block crc with a 0 value in the * hb_cksum field. Save it off here and replace after the * crc. */ old_cksum = hb_block->hb_cksum; hb_block->hb_cksum = 0; ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); hb_block->hb_cksum = old_cksum; return ret; } static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) { mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " "cksum = 0x%x, generation 0x%llx\n", (long long)le64_to_cpu(hb_block->hb_seq), hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), (long long)le64_to_cpu(hb_block->hb_generation)); } static int o2hb_verify_crc(struct o2hb_region *reg, struct o2hb_disk_heartbeat_block *hb_block) { u32 read, computed; read = le32_to_cpu(hb_block->hb_cksum); computed = o2hb_compute_block_crc_le(reg, hb_block); return read == computed; } /* * Compare the slot data with what we wrote in the last iteration. * If the match fails, print an appropriate error message. This is to * detect errors like... another node hearting on the same slot, * flaky device that is losing writes, etc. * Returns 1 if check succeeds, 0 otherwise. */ static int o2hb_check_own_slot(struct o2hb_region *reg) { struct o2hb_disk_slot *slot; struct o2hb_disk_heartbeat_block *hb_block; char *errstr; slot = ®->hr_slots[o2nm_this_node()]; /* Don't check on our 1st timestamp */ if (!slot->ds_last_time) return 0; hb_block = slot->ds_raw_block; if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && hb_block->hb_node == slot->ds_node_num) return 1; #define ERRSTR1 "Another node is heartbeating on device" #define ERRSTR2 "Heartbeat generation mismatch on device" #define ERRSTR3 "Heartbeat sequence mismatch on device" if (hb_block->hb_node != slot->ds_node_num) errstr = ERRSTR1; else if (le64_to_cpu(hb_block->hb_generation) != slot->ds_last_generation) errstr = ERRSTR2; else errstr = ERRSTR3; mlog(ML_ERROR, "%s (%pg): expected(%u:0x%llx, 0x%llx), " "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg_bdev(reg), slot->ds_node_num, (unsigned long long)slot->ds_last_generation, (unsigned long long)slot->ds_last_time, hb_block->hb_node, (unsigned long long)le64_to_cpu(hb_block->hb_generation), (unsigned long long)le64_to_cpu(hb_block->hb_seq)); return 0; } static inline void o2hb_prepare_block(struct o2hb_region *reg, u64 generation) { int node_num; u64 cputime; struct o2hb_disk_slot *slot; struct o2hb_disk_heartbeat_block *hb_block; node_num = o2nm_this_node(); slot = ®->hr_slots[node_num]; hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; memset(hb_block, 0, reg->hr_block_bytes); /* TODO: time stuff */ cputime = ktime_get_real_seconds(); if (!cputime) cputime = 1; hb_block->hb_seq = cpu_to_le64(cputime); hb_block->hb_node = node_num; hb_block->hb_generation = cpu_to_le64(generation); hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); /* This step must always happen last! */ hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, hb_block)); mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", (long long)generation, le32_to_cpu(hb_block->hb_cksum)); } static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, struct o2nm_node *node, int idx) { struct o2hb_callback_func *f; list_for_each_entry(f, &hbcall->list, hc_item) { mlog(ML_HEARTBEAT, "calling funcs %p\n", f); (f->hc_func)(node, idx, f->hc_data); } } /* Will run the list in order until we process the passed event */ static void o2hb_run_event_list(struct o2hb_node_event *queued_event) { struct o2hb_callback *hbcall; struct o2hb_node_event *event; /* Holding callback sem assures we don't alter the callback * lists when doing this, and serializes ourselves with other * processes wanting callbacks. */ down_write(&o2hb_callback_sem); spin_lock(&o2hb_live_lock); while (!list_empty(&o2hb_node_events) && !list_empty(&queued_event->hn_item)) { event = list_entry(o2hb_node_events.next, struct o2hb_node_event, hn_item); list_del_init(&event->hn_item); spin_unlock(&o2hb_live_lock); mlog(ML_HEARTBEAT, "Node %s event for %d\n", event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", event->hn_node_num); hbcall = hbcall_from_type(event->hn_event_type); /* We should *never* have gotten on to the list with a * bad type... This isn't something that we should try * to recover from. */ BUG_ON(IS_ERR(hbcall)); o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); spin_lock(&o2hb_live_lock); } spin_unlock(&o2hb_live_lock); up_write(&o2hb_callback_sem); } static void o2hb_queue_node_event(struct o2hb_node_event *event, enum o2hb_callback_type type, struct o2nm_node *node, int node_num) { assert_spin_locked(&o2hb_live_lock); BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); event->hn_event_type = type; event->hn_node = node; event->hn_node_num = node_num; mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); list_add_tail(&event->hn_item, &o2hb_node_events); } static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) { struct o2hb_node_event event = { .hn_item = LIST_HEAD_INIT(event.hn_item), }; struct o2nm_node *node; int queued = 0; node = o2nm_get_node_by_num(slot->ds_node_num); if (!node) return; spin_lock(&o2hb_live_lock); if (!list_empty(&slot->ds_live_item)) { mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", slot->ds_node_num); list_del_init(&slot->ds_live_item); if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, slot->ds_node_num); queued = 1; } } spin_unlock(&o2hb_live_lock); if (queued) o2hb_run_event_list(&event); o2nm_node_put(node); } static void o2hb_set_quorum_device(struct o2hb_region *reg) { if (!o2hb_global_heartbeat_active()) return; /* Prevent race with o2hb_heartbeat_group_drop_item() */ if (kthread_should_stop()) return; /* Tag region as quorum only after thread reaches steady state */ if (atomic_read(®->hr_steady_iterations) != 0) return; spin_lock(&o2hb_live_lock); if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) goto unlock; /* * A region can be added to the quorum only when it sees all * live nodes heartbeat on it. In other words, the region has been * added to all nodes. */ if (!bitmap_equal(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, O2NM_MAX_NODES)) goto unlock; printk(KERN_NOTICE "o2hb: Region %s (%pg) is now a quorum device\n", config_item_name(®->hr_item), reg_bdev(reg)); set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); /* * If global heartbeat active, unpin all regions if the * region count > CUT_OFF */ if (bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) o2hb_region_unpin(NULL); unlock: spin_unlock(&o2hb_live_lock); } static int o2hb_check_slot(struct o2hb_region *reg, struct o2hb_disk_slot *slot) { int changed = 0, gen_changed = 0; struct o2hb_node_event event = { .hn_item = LIST_HEAD_INIT(event.hn_item), }; struct o2nm_node *node; struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; u64 cputime; unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; unsigned int slot_dead_ms; int tmp; int queued = 0; memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); /* * If a node is no longer configured but is still in the livemap, we * may need to clear that bit from the livemap. */ node = o2nm_get_node_by_num(slot->ds_node_num); if (!node) { spin_lock(&o2hb_live_lock); tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); spin_unlock(&o2hb_live_lock); if (!tmp) return 0; } if (!o2hb_verify_crc(reg, hb_block)) { /* all paths from here will drop o2hb_live_lock for * us. */ spin_lock(&o2hb_live_lock); /* Don't print an error on the console in this case - * a freshly formatted heartbeat area will not have a * crc set on it. */ if (list_empty(&slot->ds_live_item)) goto out; /* The node is live but pushed out a bad crc. We * consider it a transient miss but don't populate any * other values as they may be junk. */ mlog(ML_ERROR, "Node %d has written a bad crc to %pg\n", slot->ds_node_num, reg_bdev(reg)); o2hb_dump_slot(hb_block); slot->ds_equal_samples++; goto fire_callbacks; } /* we don't care if these wrap.. the state transitions below * clear at the right places */ cputime = le64_to_cpu(hb_block->hb_seq); if (slot->ds_last_time != cputime) slot->ds_changed_samples++; else slot->ds_equal_samples++; slot->ds_last_time = cputime; /* The node changed heartbeat generations. We assume this to * mean it dropped off but came back before we timed out. We * want to consider it down for the time being but don't want * to lose any changed_samples state we might build up to * considering it live again. */ if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { gen_changed = 1; slot->ds_equal_samples = 0; mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " "to 0x%llx)\n", slot->ds_node_num, (long long)slot->ds_last_generation, (long long)le64_to_cpu(hb_block->hb_generation)); } slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " "seq %llu last %llu changed %u equal %u\n", slot->ds_node_num, (long long)slot->ds_last_generation, le32_to_cpu(hb_block->hb_cksum), (unsigned long long)le64_to_cpu(hb_block->hb_seq), (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, slot->ds_equal_samples); spin_lock(&o2hb_live_lock); fire_callbacks: /* dead nodes only come to life after some number of * changes at any time during their dead time */ if (list_empty(&slot->ds_live_item) && slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", slot->ds_node_num, (long long)slot->ds_last_generation); set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); /* first on the list generates a callback */ if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " "bitmap\n", slot->ds_node_num); set_bit(slot->ds_node_num, o2hb_live_node_bitmap); o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, slot->ds_node_num); changed = 1; queued = 1; } list_add_tail(&slot->ds_live_item, &o2hb_live_slots[slot->ds_node_num]); slot->ds_equal_samples = 0; /* We want to be sure that all nodes agree on the * number of milliseconds before a node will be * considered dead. The self-fencing timeout is * computed from this value, and a discrepancy might * result in heartbeat calling a node dead when it * hasn't self-fenced yet. */ slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); if (slot_dead_ms && slot_dead_ms != dead_ms) { /* TODO: Perhaps we can fail the region here. */ mlog(ML_ERROR, "Node %d on device %pg has a dead count " "of %u ms, but our count is %u ms.\n" "Please double check your configuration values " "for 'O2CB_HEARTBEAT_THRESHOLD'\n", slot->ds_node_num, reg_bdev(reg), slot_dead_ms, dead_ms); } goto out; } /* if the list is dead, we're done.. */ if (list_empty(&slot->ds_live_item)) goto out; /* live nodes only go dead after enough consequtive missed * samples.. reset the missed counter whenever we see * activity */ if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { mlog(ML_HEARTBEAT, "Node %d left my region\n", slot->ds_node_num); clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); /* last off the live_slot generates a callback */ list_del_init(&slot->ds_live_item); if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " "nodes bitmap\n", slot->ds_node_num); clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); /* node can be null */ o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, slot->ds_node_num); changed = 1; queued = 1; } /* We don't clear this because the node is still * actually writing new blocks. */ if (!gen_changed) slot->ds_changed_samples = 0; goto out; } if (slot->ds_changed_samples) { slot->ds_changed_samples = 0; slot->ds_equal_samples = 0; } out: spin_unlock(&o2hb_live_lock); if (queued) o2hb_run_event_list(&event); if (node) o2nm_node_put(node); return changed; } static int o2hb_highest_node(unsigned long *nodes, int numbits) { return find_last_bit(nodes, numbits); } static int o2hb_lowest_node(unsigned long *nodes, int numbits) { return find_first_bit(nodes, numbits); } static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) { int i, ret, highest_node, lowest_node; int membership_change = 0, own_slot_ok = 0; unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; struct o2hb_bio_wait_ctxt write_wc; ret = o2nm_configured_node_map(configured_nodes, sizeof(configured_nodes)); if (ret) { mlog_errno(ret); goto bail; } /* * If a node is not configured but is in the livemap, we still need * to read the slot so as to be able to remove it from the livemap. */ o2hb_fill_node_map(live_node_bitmap, O2NM_MAX_NODES); i = -1; while ((i = find_next_bit(live_node_bitmap, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { set_bit(i, configured_nodes); } highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); lowest_node = o2hb_lowest_node(configured_nodes, O2NM_MAX_NODES); if (highest_node >= O2NM_MAX_NODES || lowest_node >= O2NM_MAX_NODES) { mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); ret = -EINVAL; goto bail; } /* No sense in reading the slots of nodes that don't exist * yet. Of course, if the node definitions have holes in them * then we're reading an empty slot anyway... Consider this * best-effort. */ ret = o2hb_read_slots(reg, lowest_node, highest_node + 1); if (ret < 0) { mlog_errno(ret); goto bail; } /* With an up to date view of the slots, we can check that no * other node has been improperly configured to heartbeat in * our slot. */ own_slot_ok = o2hb_check_own_slot(reg); /* fill in the proper info for our next heartbeat */ o2hb_prepare_block(reg, reg->hr_generation); ret = o2hb_issue_node_write(reg, &write_wc); if (ret < 0) { mlog_errno(ret); goto bail; } i = -1; while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); } /* * We have to be sure we've advertised ourselves on disk * before we can go to steady state. This ensures that * people we find in our steady state have seen us. */ o2hb_wait_on_io(&write_wc); if (write_wc.wc_error) { /* Do not re-arm the write timeout on I/O error - we * can't be sure that the new block ever made it to * disk */ mlog(ML_ERROR, "Write error %d on device \"%pg\"\n", write_wc.wc_error, reg_bdev(reg)); ret = write_wc.wc_error; goto bail; } /* Skip disarming the timeout if own slot has stale/bad data */ if (own_slot_ok) { o2hb_set_quorum_device(reg); o2hb_arm_timeout(reg); reg->hr_last_timeout_start = jiffies; } bail: /* let the person who launched us know when things are steady */ if (atomic_read(®->hr_steady_iterations) != 0) { if (!ret && own_slot_ok && !membership_change) { if (atomic_dec_and_test(®->hr_steady_iterations)) wake_up(&o2hb_steady_queue); } } if (atomic_read(®->hr_steady_iterations) != 0) { if (atomic_dec_and_test(®->hr_unsteady_iterations)) { printk(KERN_NOTICE "o2hb: Unable to stabilize " "heartbeat on region %s (%pg)\n", config_item_name(®->hr_item), reg_bdev(reg)); atomic_set(®->hr_steady_iterations, 0); reg->hr_aborted_start = 1; wake_up(&o2hb_steady_queue); ret = -EIO; } } return ret; } /* * we ride the region ref that the region dir holds. before the region * dir is removed and drops it ref it will wait to tear down this * thread. */ static int o2hb_thread(void *data) { int i, ret; struct o2hb_region *reg = data; struct o2hb_bio_wait_ctxt write_wc; ktime_t before_hb, after_hb; unsigned int elapsed_msec; mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); set_user_nice(current, MIN_NICE); /* Pin node */ ret = o2nm_depend_this_node(); if (ret) { mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); reg->hr_node_deleted = 1; wake_up(&o2hb_steady_queue); return 0; } while (!kthread_should_stop() && !reg->hr_unclean_stop && !reg->hr_aborted_start) { /* We track the time spent inside * o2hb_do_disk_heartbeat so that we avoid more than * hr_timeout_ms between disk writes. On busy systems * this should result in a heartbeat which is less * likely to time itself out. */ before_hb = ktime_get_real(); ret = o2hb_do_disk_heartbeat(reg); reg->hr_last_hb_status = ret; after_hb = ktime_get_real(); elapsed_msec = (unsigned int) ktime_ms_delta(after_hb, before_hb); mlog(ML_HEARTBEAT, "start = %lld, end = %lld, msec = %u, ret = %d\n", before_hb, after_hb, elapsed_msec, ret); if (!kthread_should_stop() && elapsed_msec < reg->hr_timeout_ms) { /* the kthread api has blocked signals for us so no * need to record the return value. */ msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); } } o2hb_disarm_timeout(reg); /* unclean stop is only used in very bad situation */ for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) o2hb_shutdown_slot(®->hr_slots[i]); /* Explicit down notification - avoid forcing the other nodes * to timeout on this region when we could just as easily * write a clear generation - thus indicating to them that * this node has left this region. */ if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { o2hb_prepare_block(reg, 0); ret = o2hb_issue_node_write(reg, &write_wc); if (ret == 0) o2hb_wait_on_io(&write_wc); else mlog_errno(ret); } /* Unpin node */ o2nm_undepend_this_node(); mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); return 0; } #ifdef CONFIG_DEBUG_FS static int o2hb_debug_open(struct inode *inode, struct file *file) { struct o2hb_debug_buf *db = inode->i_private; struct o2hb_region *reg; unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; unsigned long lts; char *buf = NULL; int i = -1; int out = 0; /* max_nodes should be the largest bitmap we pass here */ BUG_ON(sizeof(map) < db->db_size); buf = kmalloc(PAGE_SIZE, GFP_KERNEL); if (!buf) goto bail; switch (db->db_type) { case O2HB_DB_TYPE_LIVENODES: case O2HB_DB_TYPE_LIVEREGIONS: case O2HB_DB_TYPE_QUORUMREGIONS: case O2HB_DB_TYPE_FAILEDREGIONS: spin_lock(&o2hb_live_lock); memcpy(map, db->db_data, db->db_size); spin_unlock(&o2hb_live_lock); break; case O2HB_DB_TYPE_REGION_LIVENODES: spin_lock(&o2hb_live_lock); reg = (struct o2hb_region *)db->db_data; memcpy(map, reg->hr_live_node_bitmap, db->db_size); spin_unlock(&o2hb_live_lock); break; case O2HB_DB_TYPE_REGION_NUMBER: reg = (struct o2hb_region *)db->db_data; out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n", reg->hr_region_num); goto done; case O2HB_DB_TYPE_REGION_ELAPSED_TIME: reg = (struct o2hb_region *)db->db_data; lts = reg->hr_last_timeout_start; /* If 0, it has never been set before */ if (lts) lts = jiffies_to_msecs(jiffies - lts); out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); goto done; case O2HB_DB_TYPE_REGION_PINNED: reg = (struct o2hb_region *)db->db_data; out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n", !!reg->hr_item_pinned); goto done; default: goto done; } while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i); out += scnprintf(buf + out, PAGE_SIZE - out, "\n"); done: i_size_write(inode, out); file->private_data = buf; return 0; bail: return -ENOMEM; } static int o2hb_debug_release(struct inode *inode, struct file *file) { kfree(file->private_data); return 0; } static ssize_t o2hb_debug_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) { return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, i_size_read(file->f_mapping->host)); } #else static int o2hb_debug_open(struct inode *inode, struct file *file) { return 0; } static int o2hb_debug_release(struct inode *inode, struct file *file) { return 0; } static ssize_t o2hb_debug_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) { return 0; } #endif /* CONFIG_DEBUG_FS */ static const struct file_operations o2hb_debug_fops = { .open = o2hb_debug_open, .release = o2hb_debug_release, .read = o2hb_debug_read, .llseek = generic_file_llseek, }; void o2hb_exit(void) { debugfs_remove_recursive(o2hb_debug_dir); kfree(o2hb_db_livenodes); kfree(o2hb_db_liveregions); kfree(o2hb_db_quorumregions); kfree(o2hb_db_failedregions); } static void o2hb_debug_create(const char *name, struct dentry *dir, struct o2hb_debug_buf **db, int db_len, int type, int size, int len, void *data) { *db = kmalloc(db_len, GFP_KERNEL); if (!*db) return; (*db)->db_type = type; (*db)->db_size = size; (*db)->db_len = len; (*db)->db_data = data; debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, &o2hb_debug_fops); } static void o2hb_debug_init(void) { o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); o2hb_debug_create(O2HB_DEBUG_LIVENODES, o2hb_debug_dir, &o2hb_db_livenodes, sizeof(*o2hb_db_livenodes), O2HB_DB_TYPE_LIVENODES, sizeof(o2hb_live_node_bitmap), O2NM_MAX_NODES, o2hb_live_node_bitmap); o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, o2hb_debug_dir, &o2hb_db_liveregions, sizeof(*o2hb_db_liveregions), O2HB_DB_TYPE_LIVEREGIONS, sizeof(o2hb_live_region_bitmap), O2NM_MAX_REGIONS, o2hb_live_region_bitmap); o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, o2hb_debug_dir, &o2hb_db_quorumregions, sizeof(*o2hb_db_quorumregions), O2HB_DB_TYPE_QUORUMREGIONS, sizeof(o2hb_quorum_region_bitmap), O2NM_MAX_REGIONS, o2hb_quorum_region_bitmap); o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, o2hb_debug_dir, &o2hb_db_failedregions, sizeof(*o2hb_db_failedregions), O2HB_DB_TYPE_FAILEDREGIONS, sizeof(o2hb_failed_region_bitmap), O2NM_MAX_REGIONS, o2hb_failed_region_bitmap); } void o2hb_init(void) { int i; for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) INIT_LIST_HEAD(&o2hb_callbacks[i].list); for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) INIT_LIST_HEAD(&o2hb_live_slots[i]); bitmap_zero(o2hb_live_node_bitmap, O2NM_MAX_NODES); bitmap_zero(o2hb_region_bitmap, O2NM_MAX_REGIONS); bitmap_zero(o2hb_live_region_bitmap, O2NM_MAX_REGIONS); bitmap_zero(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS); bitmap_zero(o2hb_failed_region_bitmap, O2NM_MAX_REGIONS); o2hb_dependent_users = 0; o2hb_debug_init(); } /* if we're already in a callback then we're already serialized by the sem */ static void o2hb_fill_node_map_from_callback(unsigned long *map, unsigned int bits) { bitmap_copy(map, o2hb_live_node_bitmap, bits); } /* * get a map of all nodes that are heartbeating in any regions */ void o2hb_fill_node_map(unsigned long *map, unsigned int bits) { /* callers want to serialize this map and callbacks so that they * can trust that they don't miss nodes coming to the party */ down_read(&o2hb_callback_sem); spin_lock(&o2hb_live_lock); o2hb_fill_node_map_from_callback(map, bits); spin_unlock(&o2hb_live_lock); up_read(&o2hb_callback_sem); } EXPORT_SYMBOL_GPL(o2hb_fill_node_map); /* * heartbeat configfs bits. The heartbeat set is a default set under * the cluster set in nodemanager.c. */ static struct o2hb_region *to_o2hb_region(struct config_item *item) { return item ? container_of(item, struct o2hb_region, hr_item) : NULL; } /* drop_item only drops its ref after killing the thread, nothing should * be using the region anymore. this has to clean up any state that * attributes might have built up. */ static void o2hb_region_release(struct config_item *item) { int i; struct page *page; struct o2hb_region *reg = to_o2hb_region(item); mlog(ML_HEARTBEAT, "hb region release (%pg)\n", reg_bdev(reg)); kfree(reg->hr_tmp_block); if (reg->hr_slot_data) { for (i = 0; i < reg->hr_num_pages; i++) { page = reg->hr_slot_data[i]; if (page) __free_page(page); } kfree(reg->hr_slot_data); } if (reg->hr_bdev_handle) bdev_release(reg->hr_bdev_handle); kfree(reg->hr_slots); debugfs_remove_recursive(reg->hr_debug_dir); kfree(reg->hr_db_livenodes); kfree(reg->hr_db_regnum); kfree(reg->hr_db_elapsed_time); kfree(reg->hr_db_pinned); spin_lock(&o2hb_live_lock); list_del(®->hr_all_item); spin_unlock(&o2hb_live_lock); o2net_unregister_handler_list(®->hr_handler_list); kfree(reg); } static int o2hb_read_block_input(struct o2hb_region *reg, const char *page, unsigned long *ret_bytes, unsigned int *ret_bits) { unsigned long bytes; char *p = (char *)page; bytes = simple_strtoul(p, &p, 0); if (!p || (*p && (*p != '\n'))) return -EINVAL; /* Heartbeat and fs min / max block sizes are the same. */ if (bytes > 4096 || bytes < 512) return -ERANGE; if (hweight16(bytes) != 1) return -EINVAL; if (ret_bytes) *ret_bytes = bytes; if (ret_bits) *ret_bits = ffs(bytes) - 1; return 0; } static ssize_t o2hb_region_block_bytes_show(struct config_item *item, char *page) { return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes); } static ssize_t o2hb_region_block_bytes_store(struct config_item *item, const char *page, size_t count) { struct o2hb_region *reg = to_o2hb_region(item); int status; unsigned long block_bytes; unsigned int block_bits; if (reg->hr_bdev_handle) return -EINVAL; status = o2hb_read_block_input(reg, page, &block_bytes, &block_bits); if (status) return status; reg->hr_block_bytes = (unsigned int)block_bytes; reg->hr_block_bits = block_bits; return count; } static ssize_t o2hb_region_start_block_show(struct config_item *item, char *page) { return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block); } static ssize_t o2hb_region_start_block_store(struct config_item *item, const char *page, size_t count) { struct o2hb_region *reg = to_o2hb_region(item); unsigned long long tmp; char *p = (char *)page; ssize_t ret; if (reg->hr_bdev_handle) return -EINVAL; ret = kstrtoull(p, 0, &tmp); if (ret) return -EINVAL; reg->hr_start_block = tmp; return count; } static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page) { return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks); } static ssize_t o2hb_region_blocks_store(struct config_item *item, const char *page, size_t count) { struct o2hb_region *reg = to_o2hb_region(item); unsigned long tmp; char *p = (char *)page; if (reg->hr_bdev_handle) return -EINVAL; tmp = simple_strtoul(p, &p, 0); if (!p || (*p && (*p != '\n'))) return -EINVAL; if (tmp > O2NM_MAX_NODES || tmp == 0) return -ERANGE; reg->hr_blocks = (unsigned int)tmp; return count; } static ssize_t o2hb_region_dev_show(struct config_item *item, char *page) { unsigned int ret = 0; if (to_o2hb_region(item)->hr_bdev_handle) ret = sprintf(page, "%pg\n", reg_bdev(to_o2hb_region(item))); return ret; } static void o2hb_init_region_params(struct o2hb_region *reg) { reg->hr_slots_per_page = PAGE_SIZE >> reg->hr_block_bits; reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", reg->hr_start_block, reg->hr_blocks); mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", reg->hr_block_bytes, reg->hr_block_bits); mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); } static int o2hb_map_slot_data(struct o2hb_region *reg) { int i, j; unsigned int last_slot; unsigned int spp = reg->hr_slots_per_page; struct page *page; char *raw; struct o2hb_disk_slot *slot; reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); if (reg->hr_tmp_block == NULL) return -ENOMEM; reg->hr_slots = kcalloc(reg->hr_blocks, sizeof(struct o2hb_disk_slot), GFP_KERNEL); if (reg->hr_slots == NULL) return -ENOMEM; for(i = 0; i < reg->hr_blocks; i++) { slot = ®->hr_slots[i]; slot->ds_node_num = i; INIT_LIST_HEAD(&slot->ds_live_item); slot->ds_raw_block = NULL; } reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " "at %u blocks per page\n", reg->hr_num_pages, reg->hr_blocks, spp); reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), GFP_KERNEL); if (!reg->hr_slot_data) return -ENOMEM; for(i = 0; i < reg->hr_num_pages; i++) { page = alloc_page(GFP_KERNEL); if (!page) return -ENOMEM; reg->hr_slot_data[i] = page; last_slot = i * spp; raw = page_address(page); for (j = 0; (j < spp) && ((j + last_slot) < reg->hr_blocks); j++) { BUG_ON((j + last_slot) >= reg->hr_blocks); slot = ®->hr_slots[j + last_slot]; slot->ds_raw_block = (struct o2hb_disk_heartbeat_block *) raw; raw += reg->hr_block_bytes; } } return 0; } /* Read in all the slots available and populate the tracking * structures so that we can start with a baseline idea of what's * there. */ static int o2hb_populate_slot_data(struct o2hb_region *reg) { int ret, i; struct o2hb_disk_slot *slot; struct o2hb_disk_heartbeat_block *hb_block; ret = o2hb_read_slots(reg, 0, reg->hr_blocks); if (ret) goto out; /* We only want to get an idea of the values initially in each * slot, so we do no verification - o2hb_check_slot will * actually determine if each configured slot is valid and * whether any values have changed. */ for(i = 0; i < reg->hr_blocks; i++) { slot = ®->hr_slots[i]; hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; /* Only fill the values that o2hb_check_slot uses to * determine changing slots */ slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); } out: return ret; } /* * this is acting as commit; we set up all of hr_bdev_handle and hr_task or * nothing */ static ssize_t o2hb_region_dev_store(struct config_item *item, const char *page, size_t count) { struct o2hb_region *reg = to_o2hb_region(item); struct task_struct *hb_task; long fd; int sectsize; char *p = (char *)page; struct fd f; ssize_t ret = -EINVAL; int live_threshold; if (reg->hr_bdev_handle) goto out; /* We can't heartbeat without having had our node number * configured yet. */ if (o2nm_this_node() == O2NM_MAX_NODES) goto out; fd = simple_strtol(p, &p, 0); if (!p || (*p && (*p != '\n'))) goto out; if (fd < 0 || fd >= INT_MAX) goto out; f = fdget(fd); if (f.file == NULL) goto out; if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || reg->hr_block_bytes == 0) goto out2; if (!S_ISBLK(f.file->f_mapping->host->i_mode)) goto out2; reg->hr_bdev_handle = bdev_open_by_dev(f.file->f_mapping->host->i_rdev, BLK_OPEN_WRITE | BLK_OPEN_READ, NULL, NULL); if (IS_ERR(reg->hr_bdev_handle)) { ret = PTR_ERR(reg->hr_bdev_handle); reg->hr_bdev_handle = NULL; goto out2; } sectsize = bdev_logical_block_size(reg_bdev(reg)); if (sectsize != reg->hr_block_bytes) { mlog(ML_ERROR, "blocksize %u incorrect for device, expected %d", reg->hr_block_bytes, sectsize); ret = -EINVAL; goto out3; } o2hb_init_region_params(reg); /* Generation of zero is invalid */ do { get_random_bytes(®->hr_generation, sizeof(reg->hr_generation)); } while (reg->hr_generation == 0); ret = o2hb_map_slot_data(reg); if (ret) { mlog_errno(ret); goto out3; } ret = o2hb_populate_slot_data(reg); if (ret) { mlog_errno(ret); goto out3; } INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); INIT_DELAYED_WORK(®->hr_nego_timeout_work, o2hb_nego_timeout); /* * A node is considered live after it has beat LIVE_THRESHOLD * times. We're not steady until we've given them a chance * _after_ our first read. * The default threshold is bare minimum so as to limit the delay * during mounts. For global heartbeat, the threshold doubled for the * first region. */ live_threshold = O2HB_LIVE_THRESHOLD; if (o2hb_global_heartbeat_active()) { spin_lock(&o2hb_live_lock); if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) live_threshold <<= 1; spin_unlock(&o2hb_live_lock); } ++live_threshold; atomic_set(®->hr_steady_iterations, live_threshold); /* unsteady_iterations is triple the steady_iterations */ atomic_set(®->hr_unsteady_iterations, (live_threshold * 3)); hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", reg->hr_item.ci_name); if (IS_ERR(hb_task)) { ret = PTR_ERR(hb_task); mlog_errno(ret); goto out3; } spin_lock(&o2hb_live_lock); reg->hr_task = hb_task; spin_unlock(&o2hb_live_lock); ret = wait_event_interruptible(o2hb_steady_queue, atomic_read(®->hr_steady_iterations) == 0 || reg->hr_node_deleted); if (ret) { atomic_set(®->hr_steady_iterations, 0); reg->hr_aborted_start = 1; } if (reg->hr_aborted_start) { ret = -EIO; goto out3; } if (reg->hr_node_deleted) { ret = -EINVAL; goto out3; } /* Ok, we were woken. Make sure it wasn't by drop_item() */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; if (o2hb_global_heartbeat_active()) set_bit(reg->hr_region_num, o2hb_live_region_bitmap); spin_unlock(&o2hb_live_lock); if (hb_task) ret = count; else ret = -EIO; if (hb_task && o2hb_global_heartbeat_active()) printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%pg)\n", config_item_name(®->hr_item), reg_bdev(reg)); out3: if (ret < 0) { bdev_release(reg->hr_bdev_handle); reg->hr_bdev_handle = NULL; } out2: fdput(f); out: return ret; } static ssize_t o2hb_region_pid_show(struct config_item *item, char *page) { struct o2hb_region *reg = to_o2hb_region(item); pid_t pid = 0; spin_lock(&o2hb_live_lock); if (reg->hr_task) pid = task_pid_nr(reg->hr_task); spin_unlock(&o2hb_live_lock); if (!pid) return 0; return sprintf(page, "%u\n", pid); } CONFIGFS_ATTR(o2hb_region_, block_bytes); CONFIGFS_ATTR(o2hb_region_, start_block); CONFIGFS_ATTR(o2hb_region_, blocks); CONFIGFS_ATTR(o2hb_region_, dev); CONFIGFS_ATTR_RO(o2hb_region_, pid); static struct configfs_attribute *o2hb_region_attrs[] = { &o2hb_region_attr_block_bytes, &o2hb_region_attr_start_block, &o2hb_region_attr_blocks, &o2hb_region_attr_dev, &o2hb_region_attr_pid, NULL, }; static struct configfs_item_operations o2hb_region_item_ops = { .release = o2hb_region_release, }; static const struct config_item_type o2hb_region_type = { .ct_item_ops = &o2hb_region_item_ops, .ct_attrs = o2hb_region_attrs, .ct_owner = THIS_MODULE, }; /* heartbeat set */ struct o2hb_heartbeat_group { struct config_group hs_group; /* some stuff? */ }; static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) { return group ? container_of(group, struct o2hb_heartbeat_group, hs_group) : NULL; } static void o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *parent) { struct dentry *dir; dir = debugfs_create_dir(config_item_name(®->hr_item), parent); reg->hr_debug_dir = dir; o2hb_debug_create(O2HB_DEBUG_LIVENODES, dir, &(reg->hr_db_livenodes), sizeof(*(reg->hr_db_livenodes)), O2HB_DB_TYPE_REGION_LIVENODES, sizeof(reg->hr_live_node_bitmap), O2NM_MAX_NODES, reg); o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, dir, &(reg->hr_db_regnum), sizeof(*(reg->hr_db_regnum)), O2HB_DB_TYPE_REGION_NUMBER, 0, O2NM_MAX_NODES, reg); o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, dir, &(reg->hr_db_elapsed_time), sizeof(*(reg->hr_db_elapsed_time)), O2HB_DB_TYPE_REGION_ELAPSED_TIME, 0, 0, reg); o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, dir, &(reg->hr_db_pinned), sizeof(*(reg->hr_db_pinned)), O2HB_DB_TYPE_REGION_PINNED, 0, 0, reg); } static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, const char *name) { struct o2hb_region *reg = NULL; int ret; reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); if (reg == NULL) return ERR_PTR(-ENOMEM); if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { ret = -ENAMETOOLONG; goto free; } spin_lock(&o2hb_live_lock); reg->hr_region_num = 0; if (o2hb_global_heartbeat_active()) { reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, O2NM_MAX_REGIONS); if (reg->hr_region_num >= O2NM_MAX_REGIONS) { spin_unlock(&o2hb_live_lock); ret = -EFBIG; goto free; } set_bit(reg->hr_region_num, o2hb_region_bitmap); } list_add_tail(®->hr_all_item, &o2hb_all_regions); spin_unlock(&o2hb_live_lock); config_item_init_type_name(®->hr_item, name, &o2hb_region_type); /* this is the same way to generate msg key as dlm, for local heartbeat, * name is also the same, so make initial crc value different to avoid * message key conflict. */ reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS, name, strlen(name)); INIT_LIST_HEAD(®->hr_handler_list); ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key, sizeof(struct o2hb_nego_msg), o2hb_nego_timeout_handler, reg, NULL, ®->hr_handler_list); if (ret) goto remove_item; ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key, sizeof(struct o2hb_nego_msg), o2hb_nego_approve_handler, reg, NULL, ®->hr_handler_list); if (ret) goto unregister_handler; o2hb_debug_region_init(reg, o2hb_debug_dir); return ®->hr_item; unregister_handler: o2net_unregister_handler_list(®->hr_handler_list); remove_item: spin_lock(&o2hb_live_lock); list_del(®->hr_all_item); if (o2hb_global_heartbeat_active()) clear_bit(reg->hr_region_num, o2hb_region_bitmap); spin_unlock(&o2hb_live_lock); free: kfree(reg); return ERR_PTR(ret); } static void o2hb_heartbeat_group_drop_item(struct config_group *group, struct config_item *item) { struct task_struct *hb_task; struct o2hb_region *reg = to_o2hb_region(item); int quorum_region = 0; /* stop the thread when the user removes the region dir */ spin_lock(&o2hb_live_lock); hb_task = reg->hr_task; reg->hr_task = NULL; reg->hr_item_dropped = 1; spin_unlock(&o2hb_live_lock); if (hb_task) kthread_stop(hb_task); if (o2hb_global_heartbeat_active()) { spin_lock(&o2hb_live_lock); clear_bit(reg->hr_region_num, o2hb_region_bitmap); clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) quorum_region = 1; clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); spin_unlock(&o2hb_live_lock); printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%pg)\n", ((atomic_read(®->hr_steady_iterations) == 0) ? "stopped" : "start aborted"), config_item_name(item), reg_bdev(reg)); } /* * If we're racing a dev_write(), we need to wake them. They will * check reg->hr_task */ if (atomic_read(®->hr_steady_iterations) != 0) { reg->hr_aborted_start = 1; atomic_set(®->hr_steady_iterations, 0); wake_up(&o2hb_steady_queue); } config_item_put(item); if (!o2hb_global_heartbeat_active() || !quorum_region) return; /* * If global heartbeat active and there are dependent users, * pin all regions if quorum region count <= CUT_OFF */ spin_lock(&o2hb_live_lock); if (!o2hb_dependent_users) goto unlock; if (bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) o2hb_region_pin(NULL); unlock: spin_unlock(&o2hb_live_lock); } static ssize_t o2hb_heartbeat_group_dead_threshold_show(struct config_item *item, char *page) { return sprintf(page, "%u\n", o2hb_dead_threshold); } static ssize_t o2hb_heartbeat_group_dead_threshold_store(struct config_item *item, const char *page, size_t count) { unsigned long tmp; char *p = (char *)page; tmp = simple_strtoul(p, &p, 10); if (!p || (*p && (*p != '\n'))) return -EINVAL; /* this will validate ranges for us. */ o2hb_dead_threshold_set((unsigned int) tmp); return count; } static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item, char *page) { return sprintf(page, "%s\n", o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); } static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item, const char *page, size_t count) { unsigned int i; int ret; size_t len; len = (page[count - 1] == '\n') ? count - 1 : count; if (!len) return -EINVAL; for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len)) continue; ret = o2hb_global_heartbeat_mode_set(i); if (!ret) printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", o2hb_heartbeat_mode_desc[i]); return count; } return -EINVAL; } CONFIGFS_ATTR(o2hb_heartbeat_group_, dead_threshold); CONFIGFS_ATTR(o2hb_heartbeat_group_, mode); static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { &o2hb_heartbeat_group_attr_dead_threshold, &o2hb_heartbeat_group_attr_mode, NULL, }; static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { .make_item = o2hb_heartbeat_group_make_item, .drop_item = o2hb_heartbeat_group_drop_item, }; static const struct config_item_type o2hb_heartbeat_group_type = { .ct_group_ops = &o2hb_heartbeat_group_group_ops, .ct_attrs = o2hb_heartbeat_group_attrs, .ct_owner = THIS_MODULE, }; /* this is just here to avoid touching group in heartbeat.h which the * entire damn world #includes */ struct config_group *o2hb_alloc_hb_set(void) { struct o2hb_heartbeat_group *hs = NULL; struct config_group *ret = NULL; hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); if (hs == NULL) goto out; config_group_init_type_name(&hs->hs_group, "heartbeat", &o2hb_heartbeat_group_type); ret = &hs->hs_group; out: if (ret == NULL) kfree(hs); return ret; } void o2hb_free_hb_set(struct config_group *group) { struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); kfree(hs); } /* hb callback registration and issuing */ static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) { if (type == O2HB_NUM_CB) return ERR_PTR(-EINVAL); return &o2hb_callbacks[type]; } void o2hb_setup_callback(struct o2hb_callback_func *hc, enum o2hb_callback_type type, o2hb_cb_func *func, void *data, int priority) { INIT_LIST_HEAD(&hc->hc_item); hc->hc_func = func; hc->hc_data = data; hc->hc_priority = priority; hc->hc_type = type; hc->hc_magic = O2HB_CB_MAGIC; } EXPORT_SYMBOL_GPL(o2hb_setup_callback); /* * In local heartbeat mode, region_uuid passed matches the dlm domain name. * In global heartbeat mode, region_uuid passed is NULL. * * In local, we only pin the matching region. In global we pin all the active * regions. */ static int o2hb_region_pin(const char *region_uuid) { int ret = 0, found = 0; struct o2hb_region *reg; char *uuid; assert_spin_locked(&o2hb_live_lock); list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { if (reg->hr_item_dropped) continue; uuid = config_item_name(®->hr_item); /* local heartbeat */ if (region_uuid) { if (strcmp(region_uuid, uuid)) continue; found = 1; } if (reg->hr_item_pinned || reg->hr_item_dropped) goto skip_pin; /* Ignore ENOENT only for local hb (userdlm domain) */ ret = o2nm_depend_item(®->hr_item); if (!ret) { mlog(ML_CLUSTER, "Pin region %s\n", uuid); reg->hr_item_pinned = 1; } else { if (ret == -ENOENT && found) ret = 0; else { mlog(ML_ERROR, "Pin region %s fails with %d\n", uuid, ret); break; } } skip_pin: if (found) break; } return ret; } /* * In local heartbeat mode, region_uuid passed matches the dlm domain name. * In global heartbeat mode, region_uuid passed is NULL. * * In local, we only unpin the matching region. In global we unpin all the * active regions. */ static void o2hb_region_unpin(const char *region_uuid) { struct o2hb_region *reg; char *uuid; int found = 0; assert_spin_locked(&o2hb_live_lock); list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { if (reg->hr_item_dropped) continue; uuid = config_item_name(®->hr_item); if (region_uuid) { if (strcmp(region_uuid, uuid)) continue; found = 1; } if (reg->hr_item_pinned) { mlog(ML_CLUSTER, "Unpin region %s\n", uuid); o2nm_undepend_item(®->hr_item); reg->hr_item_pinned = 0; } if (found) break; } } static int o2hb_region_inc_user(const char *region_uuid) { int ret = 0; spin_lock(&o2hb_live_lock); /* local heartbeat */ if (!o2hb_global_heartbeat_active()) { ret = o2hb_region_pin(region_uuid); goto unlock; } /* * if global heartbeat active and this is the first dependent user, * pin all regions if quorum region count <= CUT_OFF */ o2hb_dependent_users++; if (o2hb_dependent_users > 1) goto unlock; if (bitmap_weight(o2hb_quorum_region_bitmap, O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) ret = o2hb_region_pin(NULL); unlock: spin_unlock(&o2hb_live_lock); return ret; } static void o2hb_region_dec_user(const char *region_uuid) { spin_lock(&o2hb_live_lock); /* local heartbeat */ if (!o2hb_global_heartbeat_active()) { o2hb_region_unpin(region_uuid); goto unlock; } /* * if global heartbeat active and there are no dependent users, * unpin all quorum regions */ o2hb_dependent_users--; if (!o2hb_dependent_users) o2hb_region_unpin(NULL); unlock: spin_unlock(&o2hb_live_lock); } int o2hb_register_callback(const char *region_uuid, struct o2hb_callback_func *hc) { struct o2hb_callback_func *f; struct o2hb_callback *hbcall; int ret; BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); BUG_ON(!list_empty(&hc->hc_item)); hbcall = hbcall_from_type(hc->hc_type); if (IS_ERR(hbcall)) { ret = PTR_ERR(hbcall); goto out; } if (region_uuid) { ret = o2hb_region_inc_user(region_uuid); if (ret) { mlog_errno(ret); goto out; } } down_write(&o2hb_callback_sem); list_for_each_entry(f, &hbcall->list, hc_item) { if (hc->hc_priority < f->hc_priority) { list_add_tail(&hc->hc_item, &f->hc_item); break; } } if (list_empty(&hc->hc_item)) list_add_tail(&hc->hc_item, &hbcall->list); up_write(&o2hb_callback_sem); ret = 0; out: mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", ret, __builtin_return_address(0), hc); return ret; } EXPORT_SYMBOL_GPL(o2hb_register_callback); void o2hb_unregister_callback(const char *region_uuid, struct o2hb_callback_func *hc) { BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", __builtin_return_address(0), hc); /* XXX Can this happen _with_ a region reference? */ if (list_empty(&hc->hc_item)) return; if (region_uuid) o2hb_region_dec_user(region_uuid); down_write(&o2hb_callback_sem); list_del_init(&hc->hc_item); up_write(&o2hb_callback_sem); } EXPORT_SYMBOL_GPL(o2hb_unregister_callback); int o2hb_check_node_heartbeating_no_sem(u8 node_num) { unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; spin_lock(&o2hb_live_lock); o2hb_fill_node_map_from_callback(testing_map, O2NM_MAX_NODES); spin_unlock(&o2hb_live_lock); if (!test_bit(node_num, testing_map)) { mlog(ML_HEARTBEAT, "node (%u) does not have heartbeating enabled.\n", node_num); return 0; } return 1; } EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem); int o2hb_check_node_heartbeating_from_callback(u8 node_num) { unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; o2hb_fill_node_map_from_callback(testing_map, O2NM_MAX_NODES); if (!test_bit(node_num, testing_map)) { mlog(ML_HEARTBEAT, "node (%u) does not have heartbeating enabled.\n", node_num); return 0; } return 1; } EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); /* * this is just a hack until we get the plumbing which flips file systems * read only and drops the hb ref instead of killing the node dead. */ void o2hb_stop_all_regions(void) { struct o2hb_region *reg; mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); spin_lock(&o2hb_live_lock); list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) reg->hr_unclean_stop = 1; spin_unlock(&o2hb_live_lock); } EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); int o2hb_get_all_regions(char *region_uuids, u8 max_regions) { struct o2hb_region *reg; int numregs = 0; char *p; spin_lock(&o2hb_live_lock); p = region_uuids; list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { if (reg->hr_item_dropped) continue; mlog(0, "Region: %s\n", config_item_name(®->hr_item)); if (numregs < max_regions) { memcpy(p, config_item_name(®->hr_item), O2HB_MAX_REGION_NAME_LEN); p += O2HB_MAX_REGION_NAME_LEN; } numregs++; } spin_unlock(&o2hb_live_lock); return numregs; } EXPORT_SYMBOL_GPL(o2hb_get_all_regions); int o2hb_global_heartbeat_active(void) { return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); } EXPORT_SYMBOL(o2hb_global_heartbeat_active);
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