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-rw-r--r--fs/ocfs2/vote.c756
1 files changed, 0 insertions, 756 deletions
diff --git a/fs/ocfs2/vote.c b/fs/ocfs2/vote.c
deleted file mode 100644
index c05358538f2b..000000000000
--- a/fs/ocfs2/vote.c
+++ /dev/null
@@ -1,756 +0,0 @@
-/* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * vote.c
- *
- * description here
- *
- * Copyright (C) 2003, 2004 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 021110-1307, USA.
- */
-
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/highmem.h>
-#include <linux/kthread.h>
-
-#include <cluster/heartbeat.h>
-#include <cluster/nodemanager.h>
-#include <cluster/tcp.h>
-
-#include <dlm/dlmapi.h>
-
-#define MLOG_MASK_PREFIX ML_VOTE
-#include <cluster/masklog.h>
-
-#include "ocfs2.h"
-
-#include "alloc.h"
-#include "dlmglue.h"
-#include "extent_map.h"
-#include "heartbeat.h"
-#include "inode.h"
-#include "journal.h"
-#include "slot_map.h"
-#include "vote.h"
-
-#include "buffer_head_io.h"
-
-#define OCFS2_MESSAGE_TYPE_VOTE (0x1)
-#define OCFS2_MESSAGE_TYPE_RESPONSE (0x2)
-struct ocfs2_msg_hdr
-{
- __be32 h_response_id; /* used to lookup message handle on sending
- * node. */
- __be32 h_request;
- __be64 h_blkno;
- __be32 h_generation;
- __be32 h_node_num; /* node sending this particular message. */
-};
-
-struct ocfs2_vote_msg
-{
- struct ocfs2_msg_hdr v_hdr;
- __be32 v_reserved1;
-} __attribute__ ((packed));
-
-/* Responses are given these values to maintain backwards
- * compatibility with older ocfs2 versions */
-#define OCFS2_RESPONSE_OK (0)
-#define OCFS2_RESPONSE_BUSY (-16)
-#define OCFS2_RESPONSE_BAD_MSG (-22)
-
-struct ocfs2_response_msg
-{
- struct ocfs2_msg_hdr r_hdr;
- __be32 r_response;
-} __attribute__ ((packed));
-
-struct ocfs2_vote_work {
- struct list_head w_list;
- struct ocfs2_vote_msg w_msg;
-};
-
-enum ocfs2_vote_request {
- OCFS2_VOTE_REQ_INVALID = 0,
- OCFS2_VOTE_REQ_MOUNT,
- OCFS2_VOTE_REQ_UMOUNT,
- OCFS2_VOTE_REQ_LAST
-};
-
-static inline int ocfs2_is_valid_vote_request(int request)
-{
- return OCFS2_VOTE_REQ_INVALID < request &&
- request < OCFS2_VOTE_REQ_LAST;
-}
-
-typedef void (*ocfs2_net_response_callback)(void *priv,
- struct ocfs2_response_msg *resp);
-struct ocfs2_net_response_cb {
- ocfs2_net_response_callback rc_cb;
- void *rc_priv;
-};
-
-struct ocfs2_net_wait_ctxt {
- struct list_head n_list;
- u32 n_response_id;
- wait_queue_head_t n_event;
- struct ocfs2_node_map n_node_map;
- int n_response; /* an agreggate response. 0 if
- * all nodes are go, < 0 on any
- * negative response from any
- * node or network error. */
- struct ocfs2_net_response_cb *n_callback;
-};
-
-static void ocfs2_process_mount_request(struct ocfs2_super *osb,
- unsigned int node_num)
-{
- mlog(0, "MOUNT vote from node %u\n", node_num);
- /* The other node only sends us this message when he has an EX
- * on the superblock, so our recovery threads (if having been
- * launched) are waiting on it.*/
- ocfs2_recovery_map_clear(osb, node_num);
- ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num);
-
- /* We clear the umount map here because a node may have been
- * previously mounted, safely unmounted but never stopped
- * heartbeating - in which case we'd have a stale entry. */
- ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
-}
-
-static void ocfs2_process_umount_request(struct ocfs2_super *osb,
- unsigned int node_num)
-{
- mlog(0, "UMOUNT vote from node %u\n", node_num);
- ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num);
- ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num);
-}
-
-static void ocfs2_process_vote(struct ocfs2_super *osb,
- struct ocfs2_vote_msg *msg)
-{
- int net_status, vote_response;
- unsigned int node_num;
- u64 blkno;
- enum ocfs2_vote_request request;
- struct ocfs2_msg_hdr *hdr = &msg->v_hdr;
- struct ocfs2_response_msg response;
-
- /* decode the network mumbo jumbo into local variables. */
- request = be32_to_cpu(hdr->h_request);
- blkno = be64_to_cpu(hdr->h_blkno);
- node_num = be32_to_cpu(hdr->h_node_num);
-
- mlog(0, "processing vote: request = %u, blkno = %llu, node_num = %u\n",
- request, (unsigned long long)blkno, node_num);
-
- if (!ocfs2_is_valid_vote_request(request)) {
- mlog(ML_ERROR, "Invalid vote request %d from node %u\n",
- request, node_num);
- vote_response = OCFS2_RESPONSE_BAD_MSG;
- goto respond;
- }
-
- vote_response = OCFS2_RESPONSE_OK;
-
- switch (request) {
- case OCFS2_VOTE_REQ_UMOUNT:
- ocfs2_process_umount_request(osb, node_num);
- goto respond;
- case OCFS2_VOTE_REQ_MOUNT:
- ocfs2_process_mount_request(osb, node_num);
- goto respond;
- default:
- /* avoids a gcc warning */
- break;
- }
-
-respond:
- /* Response struture is small so we just put it on the stack
- * and stuff it inline. */
- memset(&response, 0, sizeof(struct ocfs2_response_msg));
- response.r_hdr.h_response_id = hdr->h_response_id;
- response.r_hdr.h_blkno = hdr->h_blkno;
- response.r_hdr.h_generation = hdr->h_generation;
- response.r_hdr.h_node_num = cpu_to_be32(osb->node_num);
- response.r_response = cpu_to_be32(vote_response);
-
- net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE,
- osb->net_key,
- &response,
- sizeof(struct ocfs2_response_msg),
- node_num,
- NULL);
- /* We still want to error print for ENOPROTOOPT here. The
- * sending node shouldn't have unregistered his net handler
- * without sending an unmount vote 1st */
- if (net_status < 0
- && net_status != -ETIMEDOUT
- && net_status != -ENOTCONN)
- mlog(ML_ERROR, "message to node %u fails with error %d!\n",
- node_num, net_status);
-}
-
-static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb)
-{
- unsigned long processed;
- struct ocfs2_lock_res *lockres;
- struct ocfs2_vote_work *work;
-
- mlog_entry_void();
-
- spin_lock(&osb->vote_task_lock);
- /* grab this early so we know to try again if a state change and
- * wake happens part-way through our work */
- osb->vote_work_sequence = osb->vote_wake_sequence;
-
- processed = osb->blocked_lock_count;
- while (processed) {
- BUG_ON(list_empty(&osb->blocked_lock_list));
-
- lockres = list_entry(osb->blocked_lock_list.next,
- struct ocfs2_lock_res, l_blocked_list);
- list_del_init(&lockres->l_blocked_list);
- osb->blocked_lock_count--;
- spin_unlock(&osb->vote_task_lock);
-
- BUG_ON(!processed);
- processed--;
-
- ocfs2_process_blocked_lock(osb, lockres);
-
- spin_lock(&osb->vote_task_lock);
- }
-
- while (osb->vote_count) {
- BUG_ON(list_empty(&osb->vote_list));
- work = list_entry(osb->vote_list.next,
- struct ocfs2_vote_work, w_list);
- list_del(&work->w_list);
- osb->vote_count--;
- spin_unlock(&osb->vote_task_lock);
-
- ocfs2_process_vote(osb, &work->w_msg);
- kfree(work);
-
- spin_lock(&osb->vote_task_lock);
- }
- spin_unlock(&osb->vote_task_lock);
-
- mlog_exit_void();
-}
-
-static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb)
-{
- int empty = 0;
-
- spin_lock(&osb->vote_task_lock);
- if (list_empty(&osb->blocked_lock_list) &&
- list_empty(&osb->vote_list))
- empty = 1;
-
- spin_unlock(&osb->vote_task_lock);
- return empty;
-}
-
-static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb)
-{
- int should_wake = 0;
-
- spin_lock(&osb->vote_task_lock);
- if (osb->vote_work_sequence != osb->vote_wake_sequence)
- should_wake = 1;
- spin_unlock(&osb->vote_task_lock);
-
- return should_wake;
-}
-
-int ocfs2_vote_thread(void *arg)
-{
- int status = 0;
- struct ocfs2_super *osb = arg;
-
- /* only quit once we've been asked to stop and there is no more
- * work available */
- while (!(kthread_should_stop() &&
- ocfs2_vote_thread_lists_empty(osb))) {
-
- wait_event_interruptible(osb->vote_event,
- ocfs2_vote_thread_should_wake(osb) ||
- kthread_should_stop());
-
- mlog(0, "vote_thread: awoken\n");
-
- ocfs2_vote_thread_do_work(osb);
- }
-
- osb->vote_task = NULL;
- return status;
-}
-
-static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id)
-{
- struct ocfs2_net_wait_ctxt *w;
-
- w = kzalloc(sizeof(*w), GFP_NOFS);
- if (!w) {
- mlog_errno(-ENOMEM);
- goto bail;
- }
-
- INIT_LIST_HEAD(&w->n_list);
- init_waitqueue_head(&w->n_event);
- ocfs2_node_map_init(&w->n_node_map);
- w->n_response_id = response_id;
- w->n_callback = NULL;
-bail:
- return w;
-}
-
-static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb)
-{
- unsigned int ret;
-
- spin_lock(&osb->net_response_lock);
- ret = ++osb->net_response_ids;
- spin_unlock(&osb->net_response_lock);
-
- return ret;
-}
-
-static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb,
- struct ocfs2_net_wait_ctxt *w)
-{
- spin_lock(&osb->net_response_lock);
- list_del(&w->n_list);
- spin_unlock(&osb->net_response_lock);
-}
-
-static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb,
- struct ocfs2_net_wait_ctxt *w)
-{
- spin_lock(&osb->net_response_lock);
- list_add_tail(&w->n_list,
- &osb->net_response_list);
- spin_unlock(&osb->net_response_lock);
-}
-
-static void __ocfs2_mark_node_responded(struct ocfs2_super *osb,
- struct ocfs2_net_wait_ctxt *w,
- int node_num)
-{
- assert_spin_locked(&osb->net_response_lock);
-
- ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num);
- if (ocfs2_node_map_is_empty(osb, &w->n_node_map))
- wake_up(&w->n_event);
-}
-
-/* Intended to be called from the node down callback, we fake remove
- * the node from all our response contexts */
-void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb,
- int node_num)
-{
- struct list_head *p;
- struct ocfs2_net_wait_ctxt *w = NULL;
-
- spin_lock(&osb->net_response_lock);
-
- list_for_each(p, &osb->net_response_list) {
- w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
-
- __ocfs2_mark_node_responded(osb, w, node_num);
- }
-
- spin_unlock(&osb->net_response_lock);
-}
-
-static int ocfs2_broadcast_vote(struct ocfs2_super *osb,
- struct ocfs2_vote_msg *request,
- unsigned int response_id,
- int *response,
- struct ocfs2_net_response_cb *callback)
-{
- int status, i, remote_err;
- struct ocfs2_net_wait_ctxt *w = NULL;
- int dequeued = 0;
-
- mlog_entry_void();
-
- w = ocfs2_new_net_wait_ctxt(response_id);
- if (!w) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
- w->n_callback = callback;
-
- /* we're pretty much ready to go at this point, and this fills
- * in n_response which we need anyway... */
- ocfs2_queue_net_wait_ctxt(osb, w);
-
- i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0);
-
- while (i != O2NM_INVALID_NODE_NUM) {
- if (i != osb->node_num) {
- mlog(0, "trying to send request to node %i\n", i);
- ocfs2_node_map_set_bit(osb, &w->n_node_map, i);
-
- remote_err = 0;
- status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE,
- osb->net_key,
- request,
- sizeof(*request),
- i,
- &remote_err);
- if (status == -ETIMEDOUT) {
- mlog(0, "remote node %d timed out!\n", i);
- status = -EAGAIN;
- goto bail;
- }
- if (remote_err < 0) {
- status = remote_err;
- mlog(0, "remote error %d on node %d!\n",
- remote_err, i);
- mlog_errno(status);
- goto bail;
- }
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
- }
- i++;
- i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i);
- mlog(0, "next is %d, i am %d\n", i, osb->node_num);
- }
- mlog(0, "done sending, now waiting on responses...\n");
-
- wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map));
-
- ocfs2_dequeue_net_wait_ctxt(osb, w);
- dequeued = 1;
-
- *response = w->n_response;
- status = 0;
-bail:
- if (w) {
- if (!dequeued)
- ocfs2_dequeue_net_wait_ctxt(osb, w);
- kfree(w);
- }
-
- mlog_exit(status);
- return status;
-}
-
-static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb,
- u64 blkno,
- unsigned int generation,
- enum ocfs2_vote_request type)
-{
- struct ocfs2_vote_msg *request;
- struct ocfs2_msg_hdr *hdr;
-
- BUG_ON(!ocfs2_is_valid_vote_request(type));
-
- request = kzalloc(sizeof(*request), GFP_NOFS);
- if (!request) {
- mlog_errno(-ENOMEM);
- } else {
- hdr = &request->v_hdr;
- hdr->h_node_num = cpu_to_be32(osb->node_num);
- hdr->h_request = cpu_to_be32(type);
- hdr->h_blkno = cpu_to_be64(blkno);
- hdr->h_generation = cpu_to_be32(generation);
- }
-
- return request;
-}
-
-/* Complete the buildup of a new vote request and process the
- * broadcast return value. */
-static int ocfs2_do_request_vote(struct ocfs2_super *osb,
- struct ocfs2_vote_msg *request,
- struct ocfs2_net_response_cb *callback)
-{
- int status, response = -EBUSY;
- unsigned int response_id;
- struct ocfs2_msg_hdr *hdr;
-
- response_id = ocfs2_new_response_id(osb);
-
- hdr = &request->v_hdr;
- hdr->h_response_id = cpu_to_be32(response_id);
-
- status = ocfs2_broadcast_vote(osb, request, response_id, &response,
- callback);
- if (status < 0) {
- mlog_errno(status);
- goto bail;
- }
-
- status = response;
-bail:
-
- return status;
-}
-
-int ocfs2_request_mount_vote(struct ocfs2_super *osb)
-{
- int status;
- struct ocfs2_vote_msg *request = NULL;
-
- request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_MOUNT);
- if (!request) {
- status = -ENOMEM;
- goto bail;
- }
-
- status = -EAGAIN;
- while (status == -EAGAIN) {
- if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) &&
- signal_pending(current)) {
- status = -ERESTARTSYS;
- goto bail;
- }
-
- if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
- osb->node_num)) {
- status = 0;
- goto bail;
- }
-
- status = ocfs2_do_request_vote(osb, request, NULL);
- }
-
-bail:
- kfree(request);
- return status;
-}
-
-int ocfs2_request_umount_vote(struct ocfs2_super *osb)
-{
- int status;
- struct ocfs2_vote_msg *request = NULL;
-
- request = ocfs2_new_vote_request(osb, 0ULL, 0, OCFS2_VOTE_REQ_UMOUNT);
- if (!request) {
- status = -ENOMEM;
- goto bail;
- }
-
- status = -EAGAIN;
- while (status == -EAGAIN) {
- /* Do not check signals on this vote... We really want
- * this one to go all the way through. */
-
- if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
- osb->node_num)) {
- status = 0;
- goto bail;
- }
-
- status = ocfs2_do_request_vote(osb, request, NULL);
- }
-
-bail:
- kfree(request);
- return status;
-}
-
-/* TODO: This should eventually be a hash table! */
-static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb,
- u32 response_id)
-{
- struct list_head *p;
- struct ocfs2_net_wait_ctxt *w = NULL;
-
- list_for_each(p, &osb->net_response_list) {
- w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
- if (response_id == w->n_response_id)
- break;
- w = NULL;
- }
-
- return w;
-}
-
-/* Translate response codes into local node errno values */
-static inline int ocfs2_translate_response(int response)
-{
- int ret;
-
- switch (response) {
- case OCFS2_RESPONSE_OK:
- ret = 0;
- break;
-
- case OCFS2_RESPONSE_BUSY:
- ret = -EBUSY;
- break;
-
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-
-static int ocfs2_handle_response_message(struct o2net_msg *msg,
- u32 len,
- void *data, void **ret_data)
-{
- unsigned int response_id, node_num;
- int response_status;
- struct ocfs2_super *osb = data;
- struct ocfs2_response_msg *resp;
- struct ocfs2_net_wait_ctxt * w;
- struct ocfs2_net_response_cb *resp_cb;
-
- resp = (struct ocfs2_response_msg *) msg->buf;
-
- response_id = be32_to_cpu(resp->r_hdr.h_response_id);
- node_num = be32_to_cpu(resp->r_hdr.h_node_num);
- response_status =
- ocfs2_translate_response(be32_to_cpu(resp->r_response));
-
- mlog(0, "received response message:\n");
- mlog(0, "h_response_id = %u\n", response_id);
- mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request));
- mlog(0, "h_blkno = %llu\n",
- (unsigned long long)be64_to_cpu(resp->r_hdr.h_blkno));
- mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation));
- mlog(0, "h_node_num = %u\n", node_num);
- mlog(0, "r_response = %d\n", response_status);
-
- spin_lock(&osb->net_response_lock);
- w = __ocfs2_find_net_wait_ctxt(osb, response_id);
- if (!w) {
- mlog(0, "request not found!\n");
- goto bail;
- }
- resp_cb = w->n_callback;
-
- if (response_status && (!w->n_response)) {
- /* we only really need one negative response so don't
- * set it twice. */
- w->n_response = response_status;
- }
-
- if (resp_cb) {
- spin_unlock(&osb->net_response_lock);
-
- resp_cb->rc_cb(resp_cb->rc_priv, resp);
-
- spin_lock(&osb->net_response_lock);
- }
-
- __ocfs2_mark_node_responded(osb, w, node_num);
-bail:
- spin_unlock(&osb->net_response_lock);
-
- return 0;
-}
-
-static int ocfs2_handle_vote_message(struct o2net_msg *msg,
- u32 len,
- void *data, void **ret_data)
-{
- int status;
- struct ocfs2_super *osb = data;
- struct ocfs2_vote_work *work;
-
- work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_NOFS);
- if (!work) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- INIT_LIST_HEAD(&work->w_list);
- memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg));
-
- mlog(0, "scheduling vote request:\n");
- mlog(0, "h_response_id = %u\n",
- be32_to_cpu(work->w_msg.v_hdr.h_response_id));
- mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request));
- mlog(0, "h_blkno = %llu\n",
- (unsigned long long)be64_to_cpu(work->w_msg.v_hdr.h_blkno));
- mlog(0, "h_generation = %u\n",
- be32_to_cpu(work->w_msg.v_hdr.h_generation));
- mlog(0, "h_node_num = %u\n",
- be32_to_cpu(work->w_msg.v_hdr.h_node_num));
-
- spin_lock(&osb->vote_task_lock);
- list_add_tail(&work->w_list, &osb->vote_list);
- osb->vote_count++;
- spin_unlock(&osb->vote_task_lock);
-
- ocfs2_kick_vote_thread(osb);
-
- status = 0;
-bail:
- return status;
-}
-
-void ocfs2_unregister_net_handlers(struct ocfs2_super *osb)
-{
- if (!osb->net_key)
- return;
-
- o2net_unregister_handler_list(&osb->osb_net_handlers);
-
- if (!list_empty(&osb->net_response_list))
- mlog(ML_ERROR, "net response list not empty!\n");
-
- osb->net_key = 0;
-}
-
-int ocfs2_register_net_handlers(struct ocfs2_super *osb)
-{
- int status = 0;
-
- if (ocfs2_mount_local(osb))
- return 0;
-
- status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE,
- osb->net_key,
- sizeof(struct ocfs2_response_msg),
- ocfs2_handle_response_message,
- osb, NULL, &osb->osb_net_handlers);
- if (status) {
- mlog_errno(status);
- goto bail;
- }
-
- status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE,
- osb->net_key,
- sizeof(struct ocfs2_vote_msg),
- ocfs2_handle_vote_message,
- osb, NULL, &osb->osb_net_handlers);
- if (status) {
- mlog_errno(status);
- goto bail;
- }
-bail:
- if (status < 0)
- ocfs2_unregister_net_handlers(osb);
-
- return status;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 10:09:27 +0000