android_kernel_motorola_sm6225/fs/ocfs2/vote.c
Kurt Hackel d74c9803a9 ocfs2: Added post handler callable function in o2net message handler
Currently o2net allows one handler function per message type. This
patch adds the ability to call another function to be called after
the handler has returned the message to the other node.

Handlers are now given the option of returning a context (in the form of a
void **) which will be passed back into the post message handler function.

Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2007-02-07 12:06:56 -08:00

1030 lines
27 KiB
C

/* -*- 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/smp_lock.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. */
};
/* OCFS2_MAX_FILENAME_LEN is 255 characters, but we want to align this
* for the network. */
#define OCFS2_VOTE_FILENAME_LEN 256
struct ocfs2_vote_msg
{
struct ocfs2_msg_hdr v_hdr;
union {
__be32 v_generic1;
__be32 v_orphaned_slot; /* Used during delete votes */
__be32 v_nlink; /* Used during unlink votes */
} md1; /* Message type dependant 1 */
};
/* 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;
__be32 r_orphaned_slot;
};
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_DELETE,
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);
}
void ocfs2_mark_inode_remotely_deleted(struct inode *inode)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
assert_spin_locked(&oi->ip_lock);
/* We set the SKIP_DELETE flag on the inode so we don't try to
* delete it in delete_inode ourselves, thus avoiding
* unecessary lock pinging. If the other node failed to wipe
* the inode as a result of a crash, then recovery will pick
* up the slack. */
oi->ip_flags |= OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE;
}
static int ocfs2_process_delete_request(struct inode *inode,
int *orphaned_slot)
{
int response = OCFS2_RESPONSE_BUSY;
mlog(0, "DELETE vote on inode %lu, read lnk_cnt = %u, slot = %d\n",
inode->i_ino, inode->i_nlink, *orphaned_slot);
spin_lock(&OCFS2_I(inode)->ip_lock);
/* Whatever our vote response is, we want to make sure that
* the orphaned slot is recorded properly on this node *and*
* on the requesting node. Technically, if the requesting node
* did not know which slot the inode is orphaned in but we
* respond with BUSY he doesn't actually need the orphaned
* slot, but it doesn't hurt to do it here anyway. */
if ((*orphaned_slot) != OCFS2_INVALID_SLOT) {
mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot !=
OCFS2_INVALID_SLOT &&
OCFS2_I(inode)->ip_orphaned_slot !=
(*orphaned_slot),
"Inode %llu: This node thinks it's "
"orphaned in slot %d, messaged it's in %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
OCFS2_I(inode)->ip_orphaned_slot,
*orphaned_slot);
mlog(0, "Setting orphaned slot for inode %llu to %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
*orphaned_slot);
OCFS2_I(inode)->ip_orphaned_slot = *orphaned_slot;
} else {
mlog(0, "Sending back orphaned slot %d for inode %llu\n",
OCFS2_I(inode)->ip_orphaned_slot,
(unsigned long long)OCFS2_I(inode)->ip_blkno);
*orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot;
}
/* vote no if the file is still open. */
if (OCFS2_I(inode)->ip_open_count) {
mlog(0, "open count = %u\n",
OCFS2_I(inode)->ip_open_count);
spin_unlock(&OCFS2_I(inode)->ip_lock);
goto done;
}
spin_unlock(&OCFS2_I(inode)->ip_lock);
/* directories are a bit ugly... What if someone is sitting in
* it? We want to make sure the inode is removed completely as
* a result of the iput in process_vote. */
if (S_ISDIR(inode->i_mode) && (atomic_read(&inode->i_count) != 1)) {
mlog(0, "i_count = %u\n", atomic_read(&inode->i_count));
goto done;
}
if (filemap_fdatawrite(inode->i_mapping)) {
mlog(ML_ERROR, "Could not sync inode %llu for delete!\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
goto done;
}
sync_mapping_buffers(inode->i_mapping);
truncate_inode_pages(inode->i_mapping, 0);
ocfs2_extent_map_trunc(inode, 0);
spin_lock(&OCFS2_I(inode)->ip_lock);
/* double check open count - someone might have raced this
* thread into ocfs2_file_open while we were writing out
* data. If we're to allow a wipe of this inode now, we *must*
* hold the spinlock until we've marked it. */
if (OCFS2_I(inode)->ip_open_count) {
mlog(0, "Raced to wipe! open count = %u\n",
OCFS2_I(inode)->ip_open_count);
spin_unlock(&OCFS2_I(inode)->ip_lock);
goto done;
}
/* Mark the inode as being wiped from disk. */
ocfs2_mark_inode_remotely_deleted(inode);
spin_unlock(&OCFS2_I(inode)->ip_lock);
/* Not sure this is necessary anymore. */
d_prune_aliases(inode);
/* If we get here, then we're voting 'yes', so commit the
* delete on our side. */
response = OCFS2_RESPONSE_OK;
done:
return response;
}
static void ocfs2_process_vote(struct ocfs2_super *osb,
struct ocfs2_vote_msg *msg)
{
int net_status, vote_response;
int orphaned_slot = 0;
unsigned int node_num, generation;
u64 blkno;
enum ocfs2_vote_request request;
struct inode *inode = NULL;
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);
generation = be32_to_cpu(hdr->h_generation);
node_num = be32_to_cpu(hdr->h_node_num);
if (request == OCFS2_VOTE_REQ_DELETE)
orphaned_slot = be32_to_cpu(msg->md1.v_orphaned_slot);
mlog(0, "processing vote: request = %u, blkno = %llu, "
"generation = %u, node_num = %u, priv1 = %u\n", request,
(unsigned long long)blkno, generation, node_num,
be32_to_cpu(msg->md1.v_generic1));
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;
}
/* We cannot process the remaining message types before we're
* fully mounted. It's perfectly safe however to send a 'yes'
* response as we can't possibly have any of the state they're
* asking us to modify yet. */
if (atomic_read(&osb->vol_state) == VOLUME_INIT)
goto respond;
/* If we get here, then the request is against an inode. */
inode = ocfs2_ilookup_for_vote(osb, blkno,
request == OCFS2_VOTE_REQ_DELETE);
/* Not finding the inode is perfectly valid - it means we're
* not interested in what the other node is about to do to it
* so in those cases we automatically respond with an
* affirmative. Cluster locking ensures that we won't race
* interest in the inode with this vote request. */
if (!inode)
goto respond;
/* Check generation values. It's possible for us to get a
* request against a stale inode. If so then we proceed as if
* we had not found an inode in the first place. */
if (inode->i_generation != generation) {
mlog(0, "generation passed %u != inode generation = %u, "
"ip_flags = %x, ip_blkno = %llu, msg %llu, i_count = %u, "
"message type = %u\n", generation, inode->i_generation,
OCFS2_I(inode)->ip_flags,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)blkno, atomic_read(&inode->i_count),
request);
iput(inode);
inode = NULL;
goto respond;
}
switch (request) {
case OCFS2_VOTE_REQ_DELETE:
vote_response = ocfs2_process_delete_request(inode,
&orphaned_slot);
break;
default:
mlog(ML_ERROR, "node %u, invalid request: %u\n",
node_num, request);
vote_response = OCFS2_RESPONSE_BAD_MSG;
}
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);
response.r_orphaned_slot = cpu_to_be32(orphaned_slot);
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);
if (inode)
iput(inode);
}
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,
u32 priv)
{
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);
request->md1.v_generic1 = cpu_to_be32(priv);
}
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;
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;
}
static int ocfs2_request_vote(struct inode *inode,
struct ocfs2_vote_msg *request,
struct ocfs2_net_response_cb *callback)
{
int status;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (ocfs2_inode_is_new(inode))
return 0;
status = -EAGAIN;
while (status == -EAGAIN) {
if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) &&
signal_pending(current))
return -ERESTARTSYS;
status = ocfs2_super_lock(osb, 0);
if (status < 0) {
mlog_errno(status);
break;
}
status = 0;
if (!ocfs2_node_map_is_only(osb, &osb->mounted_map,
osb->node_num))
status = ocfs2_do_request_vote(osb, request, callback);
ocfs2_super_unlock(osb, 0);
}
return status;
}
static void ocfs2_delete_response_cb(void *priv,
struct ocfs2_response_msg *resp)
{
int orphaned_slot, node;
struct inode *inode = priv;
orphaned_slot = be32_to_cpu(resp->r_orphaned_slot);
node = be32_to_cpu(resp->r_hdr.h_node_num);
mlog(0, "node %d tells us that inode %llu is orphaned in slot %d\n",
node, (unsigned long long)OCFS2_I(inode)->ip_blkno,
orphaned_slot);
/* The other node may not actually know which slot the inode
* is orphaned in. */
if (orphaned_slot == OCFS2_INVALID_SLOT)
return;
/* Ok, the responding node knows which slot this inode is
* orphaned in. We verify that the information is correct and
* then record this in the inode. ocfs2_delete_inode will use
* this information to determine which lock to take. */
spin_lock(&OCFS2_I(inode)->ip_lock);
mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != orphaned_slot &&
OCFS2_I(inode)->ip_orphaned_slot
!= OCFS2_INVALID_SLOT, "Inode %llu: Node %d says it's "
"orphaned in slot %d, we think it's in %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
be32_to_cpu(resp->r_hdr.h_node_num),
orphaned_slot, OCFS2_I(inode)->ip_orphaned_slot);
OCFS2_I(inode)->ip_orphaned_slot = orphaned_slot;
spin_unlock(&OCFS2_I(inode)->ip_lock);
}
int ocfs2_request_delete_vote(struct inode *inode)
{
int orphaned_slot, status;
struct ocfs2_net_response_cb delete_cb;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_vote_msg *request;
spin_lock(&OCFS2_I(inode)->ip_lock);
orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot;
spin_unlock(&OCFS2_I(inode)->ip_lock);
delete_cb.rc_cb = ocfs2_delete_response_cb;
delete_cb.rc_priv = inode;
mlog(0, "Inode %llu, we start thinking orphaned slot is %d\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno, orphaned_slot);
status = -ENOMEM;
request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
inode->i_generation,
OCFS2_VOTE_REQ_DELETE, orphaned_slot);
if (request) {
status = ocfs2_request_vote(inode, request, &delete_cb);
kfree(request);
}
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, 0);
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, 0);
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));
mlog(0, "v_generic1 = %u\n", be32_to_cpu(work->w_msg.md1.v_generic1));
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;
}