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| 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * sysfile.c |
| 5 | * |
| 6 | * Initialize, read, write, etc. system files. |
| 7 | * |
| 8 | * Copyright (C) 2002, 2004 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation; either |
| 13 | * version 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public |
| 21 | * License along with this program; if not, write to the |
| 22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 23 | * Boston, MA 021110-1307, USA. |
| 24 | */ |
| 25 | |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/types.h> |
| 28 | #include <linux/highmem.h> |
| 29 | |
| 30 | #include <cluster/masklog.h> |
| 31 | |
| 32 | #include "ocfs2.h" |
| 33 | |
| 34 | #include "alloc.h" |
| 35 | #include "dir.h" |
| 36 | #include "inode.h" |
| 37 | #include "journal.h" |
| 38 | #include "sysfile.h" |
| 39 | |
| 40 | #include "buffer_head_io.h" |
| 41 | |
| 42 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, |
| 43 | int type, |
| 44 | u32 slot); |
| 45 | |
| 46 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 47 | static struct lock_class_key ocfs2_sysfile_cluster_lock_key[NUM_SYSTEM_INODES]; |
| 48 | #endif |
| 49 | |
| 50 | static inline int is_global_system_inode(int type) |
| 51 | { |
| 52 | return type >= OCFS2_FIRST_ONLINE_SYSTEM_INODE && |
| 53 | type <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; |
| 54 | } |
| 55 | |
| 56 | static struct inode **get_local_system_inode(struct ocfs2_super *osb, |
| 57 | int type, |
| 58 | u32 slot) |
| 59 | { |
| 60 | int index; |
| 61 | struct inode **local_system_inodes, **free = NULL; |
| 62 | |
| 63 | BUG_ON(slot == OCFS2_INVALID_SLOT); |
| 64 | BUG_ON(type < OCFS2_FIRST_LOCAL_SYSTEM_INODE || |
| 65 | type > OCFS2_LAST_LOCAL_SYSTEM_INODE); |
| 66 | |
| 67 | spin_lock(&osb->osb_lock); |
| 68 | local_system_inodes = osb->local_system_inodes; |
| 69 | spin_unlock(&osb->osb_lock); |
| 70 | |
| 71 | if (unlikely(!local_system_inodes)) { |
| 72 | local_system_inodes = kzalloc(sizeof(struct inode *) * |
| 73 | NUM_LOCAL_SYSTEM_INODES * |
| 74 | osb->max_slots, |
| 75 | GFP_NOFS); |
| 76 | if (!local_system_inodes) { |
| 77 | mlog_errno(-ENOMEM); |
| 78 | /* |
| 79 | * return NULL here so that ocfs2_get_sytem_file_inodes |
| 80 | * will try to create an inode and use it. We will try |
| 81 | * to initialize local_system_inodes next time. |
| 82 | */ |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 86 | spin_lock(&osb->osb_lock); |
| 87 | if (osb->local_system_inodes) { |
| 88 | /* Someone has initialized it for us. */ |
| 89 | free = local_system_inodes; |
| 90 | local_system_inodes = osb->local_system_inodes; |
| 91 | } else |
| 92 | osb->local_system_inodes = local_system_inodes; |
| 93 | spin_unlock(&osb->osb_lock); |
| 94 | if (unlikely(free)) |
| 95 | kfree(free); |
| 96 | } |
| 97 | |
| 98 | index = (slot * NUM_LOCAL_SYSTEM_INODES) + |
| 99 | (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE); |
| 100 | |
| 101 | return &local_system_inodes[index]; |
| 102 | } |
| 103 | |
| 104 | struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb, |
| 105 | int type, |
| 106 | u32 slot) |
| 107 | { |
| 108 | struct inode *inode = NULL; |
| 109 | struct inode **arr = NULL; |
| 110 | |
| 111 | /* avoid the lookup if cached in local system file array */ |
| 112 | if (is_global_system_inode(type)) { |
| 113 | arr = &(osb->global_system_inodes[type]); |
| 114 | } else |
| 115 | arr = get_local_system_inode(osb, type, slot); |
| 116 | |
| 117 | if (arr && ((inode = *arr) != NULL)) { |
| 118 | /* get a ref in addition to the array ref */ |
| 119 | inode = igrab(inode); |
| 120 | BUG_ON(!inode); |
| 121 | |
| 122 | return inode; |
| 123 | } |
| 124 | |
| 125 | /* this gets one ref thru iget */ |
| 126 | inode = _ocfs2_get_system_file_inode(osb, type, slot); |
| 127 | |
| 128 | /* add one more if putting into array for first time */ |
| 129 | if (arr && inode) { |
| 130 | *arr = igrab(inode); |
| 131 | BUG_ON(!*arr); |
| 132 | } |
| 133 | return inode; |
| 134 | } |
| 135 | |
| 136 | static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb, |
| 137 | int type, |
| 138 | u32 slot) |
| 139 | { |
| 140 | char namebuf[40]; |
| 141 | struct inode *inode = NULL; |
| 142 | u64 blkno; |
| 143 | int status = 0; |
| 144 | |
| 145 | ocfs2_sprintf_system_inode_name(namebuf, |
| 146 | sizeof(namebuf), |
| 147 | type, slot); |
| 148 | |
| 149 | status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, |
| 150 | strlen(namebuf), &blkno); |
| 151 | if (status < 0) { |
| 152 | goto bail; |
| 153 | } |
| 154 | |
| 155 | inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type); |
| 156 | if (IS_ERR(inode)) { |
| 157 | mlog_errno(PTR_ERR(inode)); |
| 158 | inode = NULL; |
| 159 | goto bail; |
| 160 | } |
| 161 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 162 | if (type == LOCAL_USER_QUOTA_SYSTEM_INODE || |
| 163 | type == LOCAL_GROUP_QUOTA_SYSTEM_INODE || |
| 164 | type == JOURNAL_SYSTEM_INODE) { |
| 165 | /* Ignore inode lock on these inodes as the lock does not |
| 166 | * really belong to any process and lockdep cannot handle |
| 167 | * that */ |
| 168 | OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL; |
| 169 | } else { |
| 170 | lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres. |
| 171 | l_lockdep_map, |
| 172 | ocfs2_system_inodes[type].si_name, |
| 173 | &ocfs2_sysfile_cluster_lock_key[type], 0); |
| 174 | } |
| 175 | #endif |
| 176 | bail: |
| 177 | |
| 178 | return inode; |
| 179 | } |
| 180 | |
| 181 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
