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 <linux/uuid.h> 27 28 #include "jfs_types.h" 29 #include "jfs_xtree.h" 30 #include "jfs_dtree.h" 31 32 /* 33 * JFS magic number 34 */ 35 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */ 36 37 /* 38 * JFS-private inode information 39 */ 40 struct jfs_inode_info { 41 int fileset; /* fileset number (always 16)*/ 42 uint mode2; /* jfs-specific mode */ 43 kuid_t saved_uid; /* saved for uid mount option */ 44 kgid_t saved_gid; /* saved for gid mount option */ 45 pxd_t ixpxd; /* inode extent descriptor */ 46 dxd_t acl; /* dxd describing acl */ 47 dxd_t ea; /* dxd describing ea */ 48 time64_t otime; /* time created */ 49 uint next_index; /* next available directory entry index */ 50 int acltype; /* Type of ACL */ 51 short btorder; /* access order */ 52 short btindex; /* btpage entry index*/ 53 struct inode *ipimap; /* inode map */ 54 unsigned long cflag; /* commit flags */ 55 u64 agstart; /* agstart of the containing IAG */ 56 u16 bxflag; /* xflag of pseudo buffer? */ 57 unchar pad; 58 signed char active_ag; /* ag currently allocating from */ 59 lid_t blid; /* lid of pseudo buffer? */ 60 lid_t atlhead; /* anonymous tlock list head */ 61 lid_t atltail; /* anonymous tlock list tail */ 62 spinlock_t ag_lock; /* protects active_ag */ 63 struct list_head anon_inode_list; /* inodes having anonymous txns */ 64 /* 65 * rdwrlock serializes xtree between reads & writes and synchronizes 66 * changes to special inodes. It's use would be redundant on 67 * directories since the i_mutex taken in the VFS is sufficient. 68 */ 69 struct rw_semaphore rdwrlock; 70 /* 71 * commit_mutex serializes transaction processing on an inode. 72 * It must be taken after beginning a transaction (txBegin), since 73 * dirty inodes may be committed while a new transaction on the 74 * inode is blocked in txBegin or TxBeginAnon 75 */ 76 struct mutex commit_mutex; 77 /* xattr_sem allows us to access the xattrs without taking i_mutex */ 78 struct rw_semaphore xattr_sem; 79 lid_t xtlid; /* lid of xtree lock on directory */ 80 union { 81 struct { 82 xtpage_t _xtroot; /* 288: xtree root */ 83 struct inomap *_imap; /* 4: inode map header */ 84 } file; 85 struct { 86 struct dir_table_slot _table[12]; /* 96: dir index */ 87 dtroot_t _dtroot; /* 288: dtree root */ 88 } dir; 89 struct { 90 unchar _unused[16]; /* 16: */ 91 dxd_t _dxd; /* 16: */ 92 /* _inline may overflow into _inline_ea when needed */ 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 #ifdef CONFIG_QUOTA 101 struct dquot *i_dquot[MAXQUOTAS]; 102 #endif 103 u32 dev; /* will die when we get wide dev_t */ 104 struct inode vfs_inode; 105 }; 106 #define i_xtroot u.file._xtroot 107 #define i_imap u.file._imap 108 #define i_dirtable u.dir._table 109 #define i_dtroot u.dir._dtroot 110 #define i_inline u.link._inline 111 #define i_inline_ea u.link._inline_ea 112 113 #define IREAD_LOCK(ip, subclass) \ 114 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) 115 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) 116 #define IWRITE_LOCK(ip, subclass) \ 117 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) 118 #define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) 119 120 /* 121 * cflag 122 */ 123 enum cflags { 124 COMMIT_Nolink, /* inode committed with zero link count */ 125 COMMIT_Inlineea, /* commit inode inline EA */ 126 COMMIT_Freewmap, /* free WMAP at iClose() */ 127 COMMIT_Dirty, /* Inode is really dirty */ 128 COMMIT_Dirtable, /* commit changes to di_dirtable */ 129 COMMIT_Stale, /* data extent is no longer valid */ 130 COMMIT_Synclist, /* metadata pages on group commit synclist */ 131 }; 132 133 /* 134 * commit_mutex nesting subclasses: 135 */ 136 enum commit_mutex_class 137 { 138 COMMIT_MUTEX_PARENT, 139 COMMIT_MUTEX_CHILD, 140 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ 141 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ 142 }; 143 144 /* 145 * rdwrlock subclasses: 146 * The dmap inode may be locked while a normal inode or the imap inode are 147 * locked. 148 */ 149 enum rdwrlock_class 150 { 151 RDWRLOCK_NORMAL, 152 RDWRLOCK_IMAP, 153 RDWRLOCK_DMAP 154 }; 155 156 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) 157 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) 158 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) 159 #define test_and_clear_cflag(flag, ip) \ 160 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) 161 /* 162 * JFS-private superblock information. 163 */ 164 struct jfs_sb_info { 165 struct super_block *sb; /* Point back to vfs super block */ 166 unsigned long mntflag; /* aggregate attributes */ 167 struct inode *ipbmap; /* block map inode */ 168 struct inode *ipaimap; /* aggregate inode map inode */ 169 struct inode *ipaimap2; /* secondary aimap inode */ 170 struct inode *ipimap; /* aggregate inode map inode */ 171 struct jfs_log *log; /* log */ 172 struct list_head log_list; /* volumes associated with a journal */ 173 short bsize; /* logical block size */ 174 short l2bsize; /* log2 logical block size */ 175 short nbperpage; /* blocks per page */ 176 short l2nbperpage; /* log2 blocks per page */ 177 short l2niperblk; /* log2 inodes per page */ 178 dev_t logdev; /* external log device */ 179 uint aggregate; /* volume identifier in log record */ 180 pxd_t logpxd; /* pxd describing log */ 181 pxd_t fsckpxd; /* pxd describing fsck wkspc */ 182 pxd_t ait2; /* pxd describing AIT copy */ 183 uuid_t uuid; /* 128-bit uuid for volume */ 184 uuid_t loguuid; /* 128-bit uuid for log */ 185 /* 186 * commit_state is used for synchronization of the jfs_commit 187 * threads. It is protected by LAZY_LOCK(). 188 */ 189 int commit_state; /* commit state */ 190 /* Formerly in ipimap */ 191 uint gengen; /* inode generation generator*/ 192 uint inostamp; /* shows inode belongs to fileset*/ 193 194 /* Formerly in ipbmap */ 195 struct bmap *bmap; /* incore bmap descriptor */ 196 struct nls_table *nls_tab; /* current codepage */ 197 struct inode *direct_inode; /* metadata inode */ 198 uint state; /* mount/recovery state */ 199 unsigned long flag; /* mount time flags */ 200 uint p_state; /* state prior to going no integrity */ 201 kuid_t uid; /* uid to override on-disk uid */ 202 kgid_t gid; /* gid to override on-disk gid */ 203 uint umask; /* umask to override on-disk umask */ 204 uint minblks_trim; /* minimum blocks, for online trim */ 205 }; 206 207 /* jfs_sb_info commit_state */ 208 #define IN_LAZYCOMMIT 1 209 210 static inline struct jfs_inode_info *JFS_IP(struct inode *inode) 211 { 212 return container_of(inode, struct jfs_inode_info, vfs_inode); 213 } 214 215 static inline int jfs_dirtable_inline(struct inode *inode) 216 { 217 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); 218 } 219 220 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) 221 { 222 return sb->s_fs_info; 223 } 224 225 static inline int isReadOnly(struct inode *inode) 226 { 227 if (JFS_SBI(inode->i_sb)->log) 228 return 0; 229 return 1; 230 } 231 #endif /* _H_JFS_INCORE */ 232