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Linux/fs/ocfs2/sysfile.c

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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                 kfree(free);
 95         }
 96 
 97         index = (slot * NUM_LOCAL_SYSTEM_INODES) +
 98                 (type - OCFS2_FIRST_LOCAL_SYSTEM_INODE);
 99 
100         return &local_system_inodes[index];
101 }
102 
103 struct inode *ocfs2_get_system_file_inode(struct ocfs2_super *osb,
104                                           int type,
105                                           u32 slot)
106 {
107         struct inode *inode = NULL;
108         struct inode **arr = NULL;
109 
110         /* avoid the lookup if cached in local system file array */
111         if (is_global_system_inode(type)) {
112                 arr = &(osb->global_system_inodes[type]);
113         } else
114                 arr = get_local_system_inode(osb, type, slot);
115 
116         mutex_lock(&osb->system_file_mutex);
117         if (arr && ((inode = *arr) != NULL)) {
118                 /* get a ref in addition to the array ref */
119                 inode = igrab(inode);
120                 mutex_unlock(&osb->system_file_mutex);
121                 BUG_ON(!inode);
122 
123                 return inode;
124         }
125 
126         /* this gets one ref thru iget */
127         inode = _ocfs2_get_system_file_inode(osb, type, slot);
128 
129         /* add one more if putting into array for first time */
130         if (arr && inode) {
131                 *arr = igrab(inode);
132                 BUG_ON(!*arr);
133         }
134         mutex_unlock(&osb->system_file_mutex);
135         return inode;
136 }
137 
138 static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
139                                                    int type,
140                                                    u32 slot)
141 {
142         char namebuf[40];
143         struct inode *inode = NULL;
144         u64 blkno;
145         int status = 0;
146 
147         ocfs2_sprintf_system_inode_name(namebuf,
148                                         sizeof(namebuf),
149                                         type, slot);
150 
151         status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
152                                             strlen(namebuf), &blkno);
153         if (status < 0) {
154                 goto bail;
155         }
156 
157         inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
158         if (IS_ERR(inode)) {
159                 mlog_errno(PTR_ERR(inode));
160                 inode = NULL;
161                 goto bail;
162         }
163 #ifdef CONFIG_DEBUG_LOCK_ALLOC
164         if (type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
165             type == LOCAL_GROUP_QUOTA_SYSTEM_INODE ||
166             type == JOURNAL_SYSTEM_INODE) {
167                 /* Ignore inode lock on these inodes as the lock does not
168                  * really belong to any process and lockdep cannot handle
169                  * that */
170                 OCFS2_I(inode)->ip_inode_lockres.l_lockdep_map.key = NULL;
171         } else {
172                 lockdep_init_map(&OCFS2_I(inode)->ip_inode_lockres.
173                                                                 l_lockdep_map,
174                                  ocfs2_system_inodes[type].si_name,
175                                  &ocfs2_sysfile_cluster_lock_key[type], 0);
176         }
177 #endif
178 bail:
179 
180         return inode;
181 }
182 
183 

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