From ccd979bdbce9fba8412beb3f1de68a9d0171b12c Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Thu, 15 Dec 2005 14:31:24 -0800 Subject: [PATCH] OCFS2: The Second Oracle Cluster Filesystem The OCFS2 file system module. Signed-off-by: Mark Fasheh Signed-off-by: Kurt Hackel --- fs/ocfs2/slot_map.c | 303 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 303 insertions(+) create mode 100644 fs/ocfs2/slot_map.c (limited to 'fs/ocfs2/slot_map.c') diff --git a/fs/ocfs2/slot_map.c b/fs/ocfs2/slot_map.c new file mode 100644 index 00000000000..871627961d6 --- /dev/null +++ b/fs/ocfs2/slot_map.c @@ -0,0 +1,303 @@ +/* -*- 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 +#include +#include +#include + +#define MLOG_MASK_PREFIX ML_SUPER +#include + +#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); + +/* Use the slot information we've collected to create a map of mounted + * nodes. Should be holding an EX on super block. assumes slot info is + * up to date. Note that we call this *after* we find a slot, so our + * own node should be set in the map too... */ +void ocfs2_populate_mounted_map(struct ocfs2_super *osb) +{ + int i; + struct ocfs2_slot_info *si = osb->slot_info; + + spin_lock(&si->si_lock); + + for (i = 0; i < si->si_size; i++) + if (si->si_global_node_nums[i] != OCFS2_INVALID_SLOT) + ocfs2_node_map_set_bit(osb, &osb->mounted_map, + si->si_global_node_nums[i]); + + spin_unlock(&si->si_lock); +} + +/* 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) +{ + int i; + s16 ret = OCFS2_INVALID_SLOT; + + for(i = 0; i < si->si_num_slots; i++) { + if (OCFS2_INVALID_SLOT == si->si_global_node_nums[i]) { + ret = (s16) i; + break; + } + } + 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 = kcalloc(1, 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, 1, &blkno, 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); + 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(ML_NOTICE, "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); +} + -- cgit v1.2.3