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linux/fs/ocfs2/vote.c

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/* -*- 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 */
__be32 v_unlink_namelen;
__be64 v_unlink_parent;
u8 v_unlink_dirent[OCFS2_VOTE_FILENAME_LEN];
};
/* 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_UNLINK,
OCFS2_VOTE_REQ_RENAME,
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 int ocfs2_match_dentry(struct dentry *dentry,
u64 parent_blkno,
unsigned int namelen,
const char *name)
{
struct inode *parent;
if (!dentry->d_parent) {
mlog(0, "Detached from parent.\n");
return 0;
}
parent = dentry->d_parent->d_inode;
/* Negative parent dentry? */
if (!parent)
return 0;
/* Name is in a different directory. */
if (OCFS2_I(parent)->ip_blkno != parent_blkno)
return 0;
if (dentry->d_name.len != namelen)
return 0;
/* comparison above guarantees this is safe. */
if (memcmp(dentry->d_name.name, name, namelen))
return 0;
return 1;
}
static void ocfs2_process_dentry_request(struct inode *inode,
int rename,
unsigned int new_nlink,
u64 parent_blkno,
unsigned int namelen,
const char *name)
{
struct dentry *dentry = NULL;
struct list_head *p;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
mlog(0, "parent %llu, namelen = %u, name = %.*s\n",
(unsigned long long)parent_blkno, namelen, namelen, name);
spin_lock(&dcache_lock);
/* Another node is removing this name from the system. It is
* up to us to find the corresponding dentry and if it exists,
* unhash it from the dcache. */
list_for_each(p, &inode->i_dentry) {
dentry = list_entry(p, struct dentry, d_alias);
if (ocfs2_match_dentry(dentry, parent_blkno, namelen, name)) {
mlog(0, "dentry found: %.*s\n",
dentry->d_name.len, dentry->d_name.name);
dget_locked(dentry);
break;
}
dentry = NULL;
}
spin_unlock(&dcache_lock);
if (dentry) {
d_delete(dentry);
dput(dentry);
}
/* rename votes don't send link counts */
if (!rename) {
mlog(0, "new_nlink = %u\n", new_nlink);
/* We don't have the proper locks here to directly
* change i_nlink and besides, the vote is sent
* *before* the operation so it may have failed on the
* other node. This passes a hint to ocfs2_drop_inode
* to force ocfs2_delete_inode, who will take the
* proper cluster locks to sort things out. */
if (new_nlink == 0) {
spin_lock(&oi->ip_lock);
oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
spin_unlock(&OCFS2_I(inode)->ip_lock);
}
}
}
static void ocfs2_process_vote(struct ocfs2_super *osb,
struct ocfs2_vote_msg *msg)
{
int net_status, vote_response;
int orphaned_slot = 0;
int rename = 0;
unsigned int node_num, generation, new_nlink, namelen;
u64 blkno, parent_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;
case OCFS2_VOTE_REQ_RENAME:
rename = 1;
/* fall through */
case OCFS2_VOTE_REQ_UNLINK:
parent_blkno = be64_to_cpu(msg->v_unlink_parent);
namelen = be32_to_cpu(msg->v_unlink_namelen);
/* new_nlink will be ignored in case of a rename vote */
new_nlink = be32_to_cpu(msg->md1.v_nlink);
ocfs2_process_dentry_request(inode, rename, new_nlink,
parent_blkno, namelen,
msg->v_unlink_dirent);
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 = kcalloc(1, sizeof(*w), GFP_KERNEL);
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 = kcalloc(1, sizeof(*request), GFP_KERNEL);
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;
}
static void ocfs2_setup_unlink_vote(struct ocfs2_vote_msg *request,
struct dentry *dentry)
{
struct inode *parent = dentry->d_parent->d_inode;
/* We need some values which will uniquely identify a dentry
* on the other nodes so that they can find it and run
* d_delete against it. Parent directory block and full name
* should suffice. */
mlog(0, "unlink/rename request: parent: %llu name: %.*s\n",
(unsigned long long)OCFS2_I(parent)->ip_blkno, dentry->d_name.len,
dentry->d_name.name);
request->v_unlink_parent = cpu_to_be64(OCFS2_I(parent)->ip_blkno);
request->v_unlink_namelen = cpu_to_be32(dentry->d_name.len);
memcpy(request->v_unlink_dirent, dentry->d_name.name,
dentry->d_name.len);
}
int ocfs2_request_unlink_vote(struct inode *inode,
struct dentry *dentry,
unsigned int nlink)
{
int status;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_vote_msg *request;
if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN)
return -ENAMETOOLONG;
status = -ENOMEM;
request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
inode->i_generation,
OCFS2_VOTE_REQ_UNLINK, nlink);
if (request) {
ocfs2_setup_unlink_vote(request, dentry);
status = ocfs2_request_vote(inode, request, NULL);
kfree(request);
}
return status;
}
int ocfs2_request_rename_vote(struct inode *inode,
struct dentry *dentry)
{
int status;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_vote_msg *request;
if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN)
return -ENAMETOOLONG;
status = -ENOMEM;
request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
inode->i_generation,
OCFS2_VOTE_REQ_RENAME, 0);
if (request) {
ocfs2_setup_unlink_vote(request, dentry);
status = ocfs2_request_vote(inode, request, NULL);
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:
if (request)
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:
if (request)
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)
{
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)
{
int status;
struct ocfs2_super *osb = data;
struct ocfs2_vote_work *work;
work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_KERNEL);
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;
status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE,
osb->net_key,
sizeof(struct ocfs2_response_msg),
ocfs2_handle_response_message,
osb, &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, &osb->osb_net_handlers);
if (status) {
mlog_errno(status);
goto bail;
}
bail:
if (status < 0)
ocfs2_unregister_net_handlers(osb);
return status;
}
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