![Robert P. J. Day](/assets/img/avatar_default.png)
All kcalloc() calls of the form "kcalloc(1,...)" are converted to the equivalent kzalloc() calls, and a few kcalloc() calls with the incorrect ordering of the first two arguments are fixed. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Cc: Jeff Garzik <jeff@garzik.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Dominik Brodowski <linux@dominikbrodowski.net> Cc: Adam Belay <ambx1@neo.rr.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Greg KH <greg@kroah.com> Cc: Mark Fasheh <mark.fasheh@oracle.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Cc: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
304 lines
7 KiB
C
304 lines
7 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* slot_map.c
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*
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*
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*
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* Copyright (C) 2002, 2004 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/highmem.h>
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#include <linux/smp_lock.h>
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#define MLOG_MASK_PREFIX ML_SUPER
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "heartbeat.h"
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#include "inode.h"
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#include "slot_map.h"
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#include "super.h"
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#include "sysfile.h"
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#include "buffer_head_io.h"
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static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
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s16 global);
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static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
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s16 slot_num,
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s16 node_num);
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/* Use the slot information we've collected to create a map of mounted
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* nodes. Should be holding an EX on super block. assumes slot info is
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* up to date. Note that we call this *after* we find a slot, so our
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* own node should be set in the map too... */
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void ocfs2_populate_mounted_map(struct ocfs2_super *osb)
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{
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int i;
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struct ocfs2_slot_info *si = osb->slot_info;
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spin_lock(&si->si_lock);
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for (i = 0; i < si->si_size; i++)
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if (si->si_global_node_nums[i] != OCFS2_INVALID_SLOT)
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ocfs2_node_map_set_bit(osb, &osb->mounted_map,
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si->si_global_node_nums[i]);
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spin_unlock(&si->si_lock);
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}
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/* post the slot information on disk into our slot_info struct. */
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void ocfs2_update_slot_info(struct ocfs2_slot_info *si)
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{
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int i;
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__le16 *disk_info;
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/* we don't read the slot block here as ocfs2_super_lock
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* should've made sure we have the most recent copy. */
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spin_lock(&si->si_lock);
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disk_info = (__le16 *) si->si_bh->b_data;
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for (i = 0; i < si->si_size; i++)
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si->si_global_node_nums[i] = le16_to_cpu(disk_info[i]);
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spin_unlock(&si->si_lock);
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}
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/* post the our slot info stuff into it's destination bh and write it
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* out. */
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int ocfs2_update_disk_slots(struct ocfs2_super *osb,
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struct ocfs2_slot_info *si)
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{
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int status, i;
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__le16 *disk_info = (__le16 *) si->si_bh->b_data;
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spin_lock(&si->si_lock);
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for (i = 0; i < si->si_size; i++)
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disk_info[i] = cpu_to_le16(si->si_global_node_nums[i]);
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spin_unlock(&si->si_lock);
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status = ocfs2_write_block(osb, si->si_bh, si->si_inode);
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if (status < 0)
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mlog_errno(status);
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return status;
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}
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/* try to find global node in the slot info. Returns
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* OCFS2_INVALID_SLOT if nothing is found. */
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static s16 __ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
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s16 global)
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{
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int i;
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s16 ret = OCFS2_INVALID_SLOT;
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for(i = 0; i < si->si_num_slots; i++) {
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if (global == si->si_global_node_nums[i]) {
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ret = (s16) i;
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break;
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}
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}
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return ret;
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}
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static s16 __ocfs2_find_empty_slot(struct ocfs2_slot_info *si)
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{
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int i;
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s16 ret = OCFS2_INVALID_SLOT;
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for(i = 0; i < si->si_num_slots; i++) {
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if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) {
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ret = (s16) i;
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break;
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}
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}
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return ret;
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}
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s16 ocfs2_node_num_to_slot(struct ocfs2_slot_info *si,
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s16 global)
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{
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s16 ret;
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spin_lock(&si->si_lock);
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ret = __ocfs2_node_num_to_slot(si, global);
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spin_unlock(&si->si_lock);
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return ret;
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}
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static void __ocfs2_fill_slot(struct ocfs2_slot_info *si,
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s16 slot_num,
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s16 node_num)
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{
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BUG_ON(slot_num == OCFS2_INVALID_SLOT);
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BUG_ON(slot_num >= si->si_num_slots);
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BUG_ON((node_num != O2NM_INVALID_NODE_NUM) &&
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(node_num >= O2NM_MAX_NODES));
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si->si_global_node_nums[slot_num] = node_num;
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}
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void ocfs2_clear_slot(struct ocfs2_slot_info *si,
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s16 slot_num)
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{
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spin_lock(&si->si_lock);
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__ocfs2_fill_slot(si, slot_num, OCFS2_INVALID_SLOT);
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spin_unlock(&si->si_lock);
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}
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int ocfs2_init_slot_info(struct ocfs2_super *osb)
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{
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int status, i;
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u64 blkno;
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struct inode *inode = NULL;
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struct buffer_head *bh = NULL;
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struct ocfs2_slot_info *si;
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si = kzalloc(sizeof(struct ocfs2_slot_info), GFP_KERNEL);
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if (!si) {
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status = -ENOMEM;
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mlog_errno(status);
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goto bail;
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}
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spin_lock_init(&si->si_lock);
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si->si_num_slots = osb->max_slots;
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si->si_size = OCFS2_MAX_SLOTS;
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for(i = 0; i < si->si_num_slots; i++)
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si->si_global_node_nums[i] = OCFS2_INVALID_SLOT;
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inode = ocfs2_get_system_file_inode(osb, SLOT_MAP_SYSTEM_INODE,
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OCFS2_INVALID_SLOT);
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if (!inode) {
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status = -EINVAL;
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mlog_errno(status);
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goto bail;
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}
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status = ocfs2_extent_map_get_blocks(inode, 0ULL, 1, &blkno, NULL);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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status = ocfs2_read_block(osb, blkno, &bh, 0, inode);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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si->si_inode = inode;
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si->si_bh = bh;
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osb->slot_info = si;
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bail:
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if (status < 0 && si)
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ocfs2_free_slot_info(si);
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return status;
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}
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void ocfs2_free_slot_info(struct ocfs2_slot_info *si)
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{
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if (si->si_inode)
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iput(si->si_inode);
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if (si->si_bh)
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brelse(si->si_bh);
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kfree(si);
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}
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int ocfs2_find_slot(struct ocfs2_super *osb)
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{
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int status;
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s16 slot;
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struct ocfs2_slot_info *si;
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mlog_entry_void();
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si = osb->slot_info;
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ocfs2_update_slot_info(si);
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spin_lock(&si->si_lock);
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/* search for ourselves first and take the slot if it already
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* exists. Perhaps we need to mark this in a variable for our
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* own journal recovery? Possibly not, though we certainly
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* need to warn to the user */
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slot = __ocfs2_node_num_to_slot(si, osb->node_num);
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if (slot == OCFS2_INVALID_SLOT) {
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/* if no slot yet, then just take 1st available
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* one. */
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slot = __ocfs2_find_empty_slot(si);
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if (slot == OCFS2_INVALID_SLOT) {
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spin_unlock(&si->si_lock);
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mlog(ML_ERROR, "no free slots available!\n");
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status = -EINVAL;
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goto bail;
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}
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} else
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mlog(ML_NOTICE, "slot %d is already allocated to this node!\n",
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slot);
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__ocfs2_fill_slot(si, slot, osb->node_num);
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osb->slot_num = slot;
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spin_unlock(&si->si_lock);
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mlog(0, "taking node slot %d\n", osb->slot_num);
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status = ocfs2_update_disk_slots(osb, si);
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if (status < 0)
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mlog_errno(status);
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bail:
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mlog_exit(status);
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return status;
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}
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void ocfs2_put_slot(struct ocfs2_super *osb)
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{
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int status;
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struct ocfs2_slot_info *si = osb->slot_info;
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if (!si)
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return;
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ocfs2_update_slot_info(si);
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spin_lock(&si->si_lock);
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__ocfs2_fill_slot(si, osb->slot_num, OCFS2_INVALID_SLOT);
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osb->slot_num = OCFS2_INVALID_SLOT;
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spin_unlock(&si->si_lock);
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status = ocfs2_update_disk_slots(osb, si);
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if (status < 0) {
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mlog_errno(status);
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goto bail;
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}
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bail:
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osb->slot_info = NULL;
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ocfs2_free_slot_info(si);
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}
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