1/* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19#ifndef _H_JFS_INCORE 20#define _H_JFS_INCORE 21 22#include <linux/mutex.h> 23#include <linux/rwsem.h> 24#include <linux/slab.h> 25#include <linux/bitops.h> 26#include "jfs_types.h" 27#include "jfs_xtree.h" 28#include "jfs_dtree.h" 29 30/* 31 * JFS magic number 32 */ 33#define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */ 34 35/* 36 * JFS-private inode information 37 */ 38struct jfs_inode_info { 39 int fileset; /* fileset number (always 16)*/ 40 uint mode2; /* jfs-specific mode */ 41 uint saved_uid; /* saved for uid mount option */ 42 uint saved_gid; /* saved for gid mount option */ 43 pxd_t ixpxd; /* inode extent descriptor */ 44 dxd_t acl; /* dxd describing acl */ 45 dxd_t ea; /* dxd describing ea */ 46 time_t otime; /* time created */ 47 uint next_index; /* next available directory entry index */ 48 int acltype; /* Type of ACL */ 49 short btorder; /* access order */ 50 short btindex; /* btpage entry index*/ 51 struct inode *ipimap; /* inode map */ 52 long cflag; /* commit flags */ 53 u16 bxflag; /* xflag of pseudo buffer? */ 54 unchar agno; /* ag number */ 55 signed char active_ag; /* ag currently allocating from */ 56 lid_t blid; /* lid of pseudo buffer? */ 57 lid_t atlhead; /* anonymous tlock list head */ 58 lid_t atltail; /* anonymous tlock list tail */ 59 spinlock_t ag_lock; /* protects active_ag */ 60 struct list_head anon_inode_list; /* inodes having anonymous txns */ 61 /* 62 * rdwrlock serializes xtree between reads & writes and synchronizes 63 * changes to special inodes. It's use would be redundant on 64 * directories since the i_mutex taken in the VFS is sufficient. 65 */ 66 struct rw_semaphore rdwrlock; 67 /* 68 * commit_mutex serializes transaction processing on an inode. 69 * It must be taken after beginning a transaction (txBegin), since 70 * dirty inodes may be committed while a new transaction on the 71 * inode is blocked in txBegin or TxBeginAnon 72 */ 73 struct mutex commit_mutex; 74 /* xattr_sem allows us to access the xattrs without taking i_mutex */ 75 struct rw_semaphore xattr_sem; 76 lid_t xtlid; /* lid of xtree lock on directory */ 77#ifdef CONFIG_JFS_POSIX_ACL 78 struct posix_acl *i_acl; 79 struct posix_acl *i_default_acl; 80#endif 81 union { 82 struct { 83 xtpage_t _xtroot; /* 288: xtree root */ 84 struct inomap *_imap; /* 4: inode map header */ 85 } file; 86 struct { 87 struct dir_table_slot _table[12]; /* 96: dir index */ 88 dtroot_t _dtroot; /* 288: dtree root */ 89 } dir; 90 struct { 91 unchar _unused[16]; /* 16: */ 92 dxd_t _dxd; /* 16: */ 93 unchar _inline[128]; /* 128: inline symlink */ 94 /* _inline_ea may overlay the last part of 95 * file._xtroot if maxentry = XTROOTINITSLOT 96 */ 97 unchar _inline_ea[128]; /* 128: inline extended attr */ 98 } link; 99 } u; 100 u32 dev; /* will die when we get wide dev_t */ 101 struct inode vfs_inode; 102}; 103#define i_xtroot u.file._xtroot 104#define i_imap u.file._imap 105#define i_dirtable u.dir._table 106#define i_dtroot u.dir._dtroot 107#define i_inline u.link._inline 108#define i_inline_ea u.link._inline_ea 109 110#define JFS_ACL_NOT_CACHED ((void *)-1) 111 112#define IREAD_LOCK(ip, subclass) \ 113 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) 114#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) 115#define IWRITE_LOCK(ip, subclass) \ 116 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) 117#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) 118 119/* 120 * cflag 121 */ 122enum cflags { 123 COMMIT_Nolink, /* inode committed with zero link count */ 124 COMMIT_Inlineea, /* commit inode inline EA */ 125 COMMIT_Freewmap, /* free WMAP at iClose() */ 126 COMMIT_Dirty, /* Inode is really dirty */ 127 COMMIT_Dirtable, /* commit changes to di_dirtable */ 128 COMMIT_Stale, /* data extent is no longer valid */ 129 COMMIT_Synclist, /* metadata pages on group commit synclist */ 130}; 131 132/* 133 * commit_mutex nesting subclasses: 134 */ 135enum commit_mutex_class 136{ 137 COMMIT_MUTEX_PARENT, 138 COMMIT_MUTEX_CHILD, 139 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ 140 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ 141}; 142 143/* 144 * rdwrlock subclasses: 145 * The dmap inode may be locked while a normal inode or the imap inode are 146 * locked. 147 */ 148enum rdwrlock_class 149{ 150 RDWRLOCK_NORMAL, 151 RDWRLOCK_IMAP, 152 RDWRLOCK_DMAP 153}; 154 155#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) 156#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) 157#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) 158#define test_and_clear_cflag(flag, ip) \ 159 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) 160/* 161 * JFS-private superblock information. 162 */ 163struct jfs_sb_info { 164 struct super_block *sb; /* Point back to vfs super block */ 165 unsigned long mntflag; /* aggregate attributes */ 166 struct inode *ipbmap; /* block map inode */ 167 struct inode *ipaimap; /* aggregate inode map inode */ 168 struct inode *ipaimap2; /* secondary aimap inode */ 169 struct inode *ipimap; /* aggregate inode map inode */ 170 struct jfs_log *log; /* log */ 171 struct list_head log_list; /* volumes associated with a journal */ 172 short bsize; /* logical block size */ 173 short l2bsize; /* log2 logical block size */ 174 short nbperpage; /* blocks per page */ 175 short l2nbperpage; /* log2 blocks per page */ 176 short l2niperblk; /* log2 inodes per page */ 177 dev_t logdev; /* external log device */ 178 uint aggregate; /* volume identifier in log record */ 179 pxd_t logpxd; /* pxd describing log */ 180 pxd_t fsckpxd; /* pxd describing fsck wkspc */ 181 pxd_t ait2; /* pxd describing AIT copy */ 182 char uuid[16]; /* 128-bit uuid for volume */ 183 char loguuid[16]; /* 128-bit uuid for log */ 184 /* 185 * commit_state is used for synchronization of the jfs_commit 186 * threads. It is protected by LAZY_LOCK(). 187 */ 188 int commit_state; /* commit state */ 189 /* Formerly in ipimap */ 190 uint gengen; /* inode generation generator*/ 191 uint inostamp; /* shows inode belongs to fileset*/ 192 193 /* Formerly in ipbmap */ 194 struct bmap *bmap; /* incore bmap descriptor */ 195 struct nls_table *nls_tab; /* current codepage */ 196 struct inode *direct_inode; /* metadata inode */ 197 uint state; /* mount/recovery state */ 198 unsigned long flag; /* mount time flags */ 199 uint p_state; /* state prior to going no integrity */ 200 uint uid; /* uid to override on-disk uid */ 201 uint gid; /* gid to override on-disk gid */ 202 uint umask; /* umask to override on-disk umask */ 203}; 204 205/* jfs_sb_info commit_state */ 206#define IN_LAZYCOMMIT 1 207 208static inline struct jfs_inode_info *JFS_IP(struct inode *inode) 209{ 210 return list_entry(inode, struct jfs_inode_info, vfs_inode); 211} 212 213static inline int jfs_dirtable_inline(struct inode *inode) 214{ 215 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); 216} 217 218static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) 219{ 220 return sb->s_fs_info; 221} 222 223static inline int isReadOnly(struct inode *inode) 224{ 225 if (JFS_SBI(inode->i_sb)->log) 226 return 0; 227 return 1; 228} 229#endif /* _H_JFS_INCORE */ 230