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 */ 38 struct jfs_inode_info { 39 int fileset; /* fileset number (always 16)*/ 40 uint mode2; /* jfs-specific mode */ 41 kuid_t saved_uid; /* saved for uid mount option */ 42 kgid_t 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 unsigned long cflag; /* commit flags */ 53 u64 agstart; /* agstart of the containing IAG */ 54 u16 bxflag; /* xflag of pseudo buffer? */ 55 unchar pad; 56 signed char active_ag; /* ag currently allocating from */ 57 lid_t blid; /* lid of pseudo buffer? */ 58 lid_t atlhead; /* anonymous tlock list head */ 59 lid_t atltail; /* anonymous tlock list tail */ 60 spinlock_t ag_lock; /* protects active_ag */ 61 struct list_head anon_inode_list; /* inodes having anonymous txns */ 62 /* 63 * rdwrlock serializes xtree between reads & writes and synchronizes 64 * changes to special inodes. It's use would be redundant on 65 * directories since the i_mutex taken in the VFS is sufficient. 66 */ 67 struct rw_semaphore rdwrlock; 68 /* 69 * commit_mutex serializes transaction processing on an inode. 70 * It must be taken after beginning a transaction (txBegin), since 71 * dirty inodes may be committed while a new transaction on the 72 * inode is blocked in txBegin or TxBeginAnon 73 */ 74 struct mutex commit_mutex; 75 /* xattr_sem allows us to access the xattrs without taking i_mutex */ 76 struct rw_semaphore xattr_sem; 77 lid_t xtlid; /* lid of xtree lock on directory */ 78 union { 79 struct { 80 xtpage_t _xtroot; /* 288: xtree root */ 81 struct inomap *_imap; /* 4: inode map header */ 82 } file; 83 struct { 84 struct dir_table_slot _table[12]; /* 96: dir index */ 85 dtroot_t _dtroot; /* 288: dtree root */ 86 } dir; 87 struct { 88 unchar _unused[16]; /* 16: */ 89 dxd_t _dxd; /* 16: */ 90 unchar _inline[128]; /* 128: inline symlink */ 91 /* _inline_ea may overlay the last part of 92 * file._xtroot if maxentry = XTROOTINITSLOT 93 */ 94 unchar _inline_ea[128]; /* 128: inline extended attr */ 95 } link; 96 } u; 97 u32 dev; /* will die when we get wide dev_t */ 98 struct inode vfs_inode; 99 }; 100 #define i_xtroot u.file._xtroot 101 #define i_imap u.file._imap 102 #define i_dirtable u.dir._table 103 #define i_dtroot u.dir._dtroot 104 #define i_inline u.link._inline 105 #define i_inline_ea u.link._inline_ea 106 107 #define IREAD_LOCK(ip, subclass) \ 108 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) 109 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) 110 #define IWRITE_LOCK(ip, subclass) \ 111 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) 112 #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) 113 114 /* 115 * cflag 116 */ 117 enum cflags { 118 COMMIT_Nolink, /* inode committed with zero link count */ 119 COMMIT_Inlineea, /* commit inode inline EA */ 120 COMMIT_Freewmap, /* free WMAP at iClose() */ 121 COMMIT_Dirty, /* Inode is really dirty */ 122 COMMIT_Dirtable, /* commit changes to di_dirtable */ 123 COMMIT_Stale, /* data extent is no longer valid */ 124 COMMIT_Synclist, /* metadata pages on group commit synclist */ 125 }; 126 127 /* 128 * commit_mutex nesting subclasses: 129 */ 130 enum commit_mutex_class 131 { 132 COMMIT_MUTEX_PARENT, 133 COMMIT_MUTEX_CHILD, 134 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ 135 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ 136 }; 137 138 /* 139 * rdwrlock subclasses: 140 * The dmap inode may be locked while a normal inode or the imap inode are 141 * locked. 142 */ 143 enum rdwrlock_class 144 { 145 RDWRLOCK_NORMAL, 146 RDWRLOCK_IMAP, 147 RDWRLOCK_DMAP 148 }; 149 150 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) 151 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) 152 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) 153 #define test_and_clear_cflag(flag, ip) \ 154 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) 155 /* 156 * JFS-private superblock information. 157 */ 158 struct jfs_sb_info { 159 struct super_block *sb; /* Point back to vfs super block */ 160 unsigned long mntflag; /* aggregate attributes */ 161 struct inode *ipbmap; /* block map inode */ 162 struct inode *ipaimap; /* aggregate inode map inode */ 163 struct inode *ipaimap2; /* secondary aimap inode */ 164 struct inode *ipimap; /* aggregate inode map inode */ 165 struct jfs_log *log; /* log */ 166 struct list_head log_list; /* volumes associated with a journal */ 167 short bsize; /* logical block size */ 168 short l2bsize; /* log2 logical block size */ 169 short nbperpage; /* blocks per page */ 170 short l2nbperpage; /* log2 blocks per page */ 171 short l2niperblk; /* log2 inodes per page */ 172 dev_t logdev; /* external log device */ 173 uint aggregate; /* volume identifier in log record */ 174 pxd_t logpxd; /* pxd describing log */ 175 pxd_t fsckpxd; /* pxd describing fsck wkspc */ 176 pxd_t ait2; /* pxd describing AIT copy */ 177 char uuid[16]; /* 128-bit uuid for volume */ 178 char loguuid[16]; /* 128-bit uuid for log */ 179 /* 180 * commit_state is used for synchronization of the jfs_commit 181 * threads. It is protected by LAZY_LOCK(). 182 */ 183 int commit_state; /* commit state */ 184 /* Formerly in ipimap */ 185 uint gengen; /* inode generation generator*/ 186 uint inostamp; /* shows inode belongs to fileset*/ 187 188 /* Formerly in ipbmap */ 189 struct bmap *bmap; /* incore bmap descriptor */ 190 struct nls_table *nls_tab; /* current codepage */ 191 struct inode *direct_inode; /* metadata inode */ 192 uint state; /* mount/recovery state */ 193 unsigned long flag; /* mount time flags */ 194 uint p_state; /* state prior to going no integrity */ 195 kuid_t uid; /* uid to override on-disk uid */ 196 kgid_t gid; /* gid to override on-disk gid */ 197 uint umask; /* umask to override on-disk umask */ 198 }; 199 200 /* jfs_sb_info commit_state */ 201 #define IN_LAZYCOMMIT 1 202 203 static inline struct jfs_inode_info *JFS_IP(struct inode *inode) 204 { 205 return list_entry(inode, struct jfs_inode_info, vfs_inode); 206 } 207 208 static inline int jfs_dirtable_inline(struct inode *inode) 209 { 210 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); 211 } 212 213 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) 214 { 215 return sb->s_fs_info; 216 } 217 218 static inline int isReadOnly(struct inode *inode) 219 { 220 if (JFS_SBI(inode->i_sb)->log) 221 return 0; 222 return 1; 223 } 224 #endif /* _H_JFS_INCORE */ 225