linux/fs/ocfs2/slot_map.c
Mark Fasheh 34d024f843 ocfs2: Remove mount/unmount votes
The node maps that are set/unset by these votes are no longer relevant, thus
we can remove the mount and umount votes. Since those are the last two
remaining votes, we can also remove the entire vote infrastructure.

The vote thread has been renamed to the downconvert thread, and the small
amount of functionality related to managing it has been moved into
fs/ocfs2/dlmglue.c. All references to votes have been removed or updated.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
2008-01-25 14:45:34 -08:00

292 lines
6.5 KiB
C

/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* slot_map.c
*
*
*
* Copyright (C) 2002, 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>
#define MLOG_MASK_PREFIX ML_SUPER
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "dlmglue.h"
#include "extent_map.h"
#include "heartbeat.h"
#include "inode.h"
#include "slot_map.h"
#include "super.h"
#include "sysfile.h"
#include "buffer_head_io.h"
static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
s16 global);
static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
s16 slot_num,
s16 node_num);
/* post the slot information on disk into our slot_info struct. */
void ocfs2_update_slot_info(struct ocfs2_slot_info *si)
{
int i;
__le16 *disk_info;
/* we don't read the slot block here as ocfs2_super_lock
* should've made sure we have the most recent copy. */
spin_lock(&si->si_lock);
disk_info = (__le16 *) si->si_bh->b_data;
for (i = 0; i < si->si_size; i++)
si->si_global_node_nums[i] = le16_to_cpu(disk_info[i]);
spin_unlock(&si->si_lock);
}
/* post the our slot info stuff into it's destination bh and write it
* out. */
int ocfs2_update_disk_slots(struct ocfs2_super *osb,
struct ocfs2_slot_info *si)
{
int status, i;
__le16 *disk_info = (__le16 *) si->si_bh->b_data;
spin_lock(&si->si_lock);
for (i = 0; i < si->si_size; i++)
disk_info[i] = cpu_to_le16(si->si_global_node_nums[i]);
spin_unlock(&si->si_lock);
status = ocfs2_write_block(osb, si->si_bh, si->si_inode);
if (status < 0)
mlog_errno(status);
return status;
}
/* try to find global node in the slot info. Returns
* OCFS2_INVALID_SLOT if nothing is found. */
static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
s16 global)
{
int i;
s16 ret = OCFS2_INVALID_SLOT;
for(i = 0; i < si->si_num_slots; i++) {
if (global == si->si_global_node_nums[i]) {
ret = (s16) i;
break;
}
}
return ret;
}
static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si, s16 preferred)
{
int i;
s16 ret = OCFS2_INVALID_SLOT;
if (preferred >= 0 && preferred < si->si_num_slots) {
if (OCFS2_INVALID_SLOT == si->si_global_node_nums[preferred]) {
ret = preferred;
goto out;
}
}
for(i = 0; i < si->si_num_slots; i++) {
if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) {
ret = (s16) i;
break;
}
}
out:
return ret;
}
s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
s16 global)
{
s16 ret;
spin_lock(&si->si_lock);
ret = __ocfs2_node_num_to_slot(si, global);
spin_unlock(&si->si_lock);
return ret;
}
static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
s16 slot_num,
s16 node_num)
{
BUG_ON(slot_num == OCFS2_INVALID_SLOT);
BUG_ON(slot_num >= si->si_num_slots);
BUG_ON((node_num != O2NM_INVALID_NODE_NUM) &&
(node_num >= O2NM_MAX_NODES));
si->si_global_node_nums[slot_num] = node_num;
}
void ocfs2_clear_slot(struct ocfs2_slot_info *si,
s16 slot_num)
{
spin_lock(&si->si_lock);
__ocfs2_fill_slot(si, slot_num, OCFS2_INVALID_SLOT);
spin_unlock(&si->si_lock);
}
int ocfs2_init_slot_info(struct ocfs2_super *osb)
{
int status, i;
u64 blkno;
struct inode *inode = NULL;
struct buffer_head *bh = NULL;
struct ocfs2_slot_info *si;
si = kzalloc(sizeof(struct ocfs2_slot_info), GFP_KERNEL);
if (!si) {
status = -ENOMEM;
mlog_errno(status);
goto bail;
}
spin_lock_init(&si->si_lock);
si->si_num_slots = osb->max_slots;
si->si_size = OCFS2_MAX_SLOTS;
for(i = 0; i < si->si_num_slots; i++)
si->si_global_node_nums[i] = OCFS2_INVALID_SLOT;
inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (!inode) {
status = -EINVAL;
mlog_errno(status);
goto bail;
}
status = ocfs2_extent_map_get_blocks(inode, 0ULL, &blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = ocfs2_read_block(osb, blkno, &bh, 0, inode);
if (status < 0) {
mlog_errno(status);
goto bail;
}
si->si_inode = inode;
si->si_bh = bh;
osb->slot_info = si;
bail:
if (status < 0 && si)
ocfs2_free_slot_info(si);
return status;
}
void ocfs2_free_slot_info(struct ocfs2_slot_info *si)
{
if (si->si_inode)
iput(si->si_inode);
if (si->si_bh)
brelse(si->si_bh);
kfree(si);
}
int ocfs2_find_slot(struct ocfs2_super *osb)
{
int status;
s16 slot;
struct ocfs2_slot_info *si;
mlog_entry_void();
si = osb->slot_info;
ocfs2_update_slot_info(si);
spin_lock(&si->si_lock);
/* search for ourselves first and take the slot if it already
* exists. Perhaps we need to mark this in a variable for our
* own journal recovery? Possibly not, though we certainly
* need to warn to the user */
slot = __ocfs2_node_num_to_slot(si, osb->node_num);
if (slot == OCFS2_INVALID_SLOT) {
/* if no slot yet, then just take 1st available
* one. */
slot = __ocfs2_find_empty_slot(si, osb->preferred_slot);
if (slot == OCFS2_INVALID_SLOT) {
spin_unlock(&si->si_lock);
mlog(ML_ERROR, "no free slots available!\n");
status = -EINVAL;
goto bail;
}
} else
mlog(ML_NOTICE, "slot %d is already allocated to this node!\n",
slot);
__ocfs2_fill_slot(si, slot, osb->node_num);
osb->slot_num = slot;
spin_unlock(&si->si_lock);
mlog(0, "taking node slot %d\n", osb->slot_num);
status = ocfs2_update_disk_slots(osb, si);
if (status < 0)
mlog_errno(status);
bail:
mlog_exit(status);
return status;
}
void ocfs2_put_slot(struct ocfs2_super *osb)
{
int status;
struct ocfs2_slot_info *si = osb->slot_info;
if (!si)
return;
ocfs2_update_slot_info(si);
spin_lock(&si->si_lock);
__ocfs2_fill_slot(si, osb->slot_num, OCFS2_INVALID_SLOT);
osb->slot_num = OCFS2_INVALID_SLOT;
spin_unlock(&si->si_lock);
status = ocfs2_update_disk_slots(osb, si);
if (status < 0) {
mlog_errno(status);
goto bail;
}
bail:
osb->slot_info = NULL;
ocfs2_free_slot_info(si);
}