[PATCH] OCFS2: The Second Oracle Cluster Filesystem
The OCFS2 file system module.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
diff --git a/fs/ocfs2/vote.c b/fs/ocfs2/vote.c
new file mode 100644
index 0000000..021978e
--- /dev/null
+++ b/fs/ocfs2/vote.c
@@ -0,0 +1,1202 @@
+/* -*- 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 %"MLFu64": This node thinks it's "
+ "orphaned in slot %d, messaged it's in %d\n",
+ OCFS2_I(inode)->ip_blkno,
+ OCFS2_I(inode)->ip_orphaned_slot,
+ *orphaned_slot);
+
+ mlog(0, "Setting orphaned slot for inode %"MLFu64" to %d\n",
+ 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 %"MLFu64"\n",
+ OCFS2_I(inode)->ip_orphaned_slot,
+ 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 %"MLFu64" for delete!\n",
+ 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 %"MLFu64", namelen = %u, name = %.*s\n", 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 = %"MLFu64", "
+ "generation = %u, node_num = %u, priv1 = %u\n", request,
+ 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 = %"MLFu64", msg %"MLFu64", "
+ "i_count = %u, message type = %u\n",
+ generation, inode->i_generation, OCFS2_I(inode)->ip_flags,
+ OCFS2_I(inode)->ip_blkno, 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 %"MLFu64" is orphaned in slot "
+ "%d\n", node, 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 %"MLFu64": Node %d "
+ "says it's orphaned in slot %d, we think it's in %d\n",
+ 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 %"MLFu64", we start thinking orphaned slot is %d\n",
+ 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: %"MLFu64" name: %.*s\n",
+ 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 = %"MLFu64"\n", 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 = %"MLFu64"\n",
+ 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;
+}