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/rwsem.h> 23 #include <linux/slab.h> 24 #include <linux/bitops.h> 25 #include "jfs_types.h" 26 #include "jfs_xtree.h" 27 #include "jfs_dtree.h" 28 29 /* 30 * JFS magic number 31 */ 32 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */ 33 34 /* 35 * JFS-private inode information 36 */ 37 struct jfs_inode_info { 38 int fileset; /* fileset number (always 16)*/ 39 uint mode2; /* jfs-specific mode */ 40 pxd_t ixpxd; /* inode extent descriptor */ 41 dxd_t acl; /* dxd describing acl */ 42 dxd_t ea; /* dxd describing ea */ 43 time_t otime; /* time created */ 44 uint next_index; /* next available directory entry index */ 45 int acltype; /* Type of ACL */ 46 short btorder; /* access order */ 47 short btindex; /* btpage entry index*/ 48 struct inode *ipimap; /* inode map */ 49 long cflag; /* commit flags */ 50 u16 bxflag; /* xflag of pseudo buffer? */ 51 unchar agno; /* ag number */ 52 signed char active_ag; /* ag currently allocating from */ 53 lid_t blid; /* lid of pseudo buffer? */ 54 lid_t atlhead; /* anonymous tlock list head */ 55 lid_t atltail; /* anonymous tlock list tail */ 56 spinlock_t ag_lock; /* protects active_ag */ 57 struct list_head anon_inode_list; /* inodes having anonymous txns */ 58 /* 59 * rdwrlock serializes xtree between reads & writes and synchronizes 60 * changes to special inodes. It's use would be redundant on 61 * directories since the i_sem taken in the VFS is sufficient. 62 */ 63 struct rw_semaphore rdwrlock; 64 /* 65 * commit_sem serializes transaction processing on an inode. 66 * It must be taken after beginning a transaction (txBegin), since 67 * dirty inodes may be committed while a new transaction on the 68 * inode is blocked in txBegin or TxBeginAnon 69 */ 70 struct semaphore commit_sem; 71 /* xattr_sem allows us to access the xattrs without taking i_sem */ 72 struct rw_semaphore xattr_sem; 73 lid_t xtlid; /* lid of xtree lock on directory */ 74 #ifdef CONFIG_JFS_POSIX_ACL 75 struct posix_acl *i_acl; 76 struct posix_acl *i_default_acl; 77 #endif 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 JFS_ACL_NOT_CACHED ((void *)-1) 108 109 #define IREAD_LOCK(ip) down_read(&JFS_IP(ip)->rdwrlock) 110 #define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) 111 #define IWRITE_LOCK(ip) down_write(&JFS_IP(ip)->rdwrlock) 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 #define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) 128 #define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) 129 #define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) 130 #define test_and_clear_cflag(flag, ip) \ 131 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) 132 /* 133 * JFS-private superblock information. 134 */ 135 struct jfs_sb_info { 136 struct super_block *sb; /* Point back to vfs super block */ 137 unsigned long mntflag; /* aggregate attributes */ 138 struct inode *ipbmap; /* block map inode */ 139 struct inode *ipaimap; /* aggregate inode map inode */ 140 struct inode *ipaimap2; /* secondary aimap inode */ 141 struct inode *ipimap; /* aggregate inode map inode */ 142 struct jfs_log *log; /* log */ 143 struct list_head log_list; /* volumes associated with a journal */ 144 short bsize; /* logical block size */ 145 short l2bsize; /* log2 logical block size */ 146 short nbperpage; /* blocks per page */ 147 short l2nbperpage; /* log2 blocks per page */ 148 short l2niperblk; /* log2 inodes per page */ 149 dev_t logdev; /* external log device */ 150 uint aggregate; /* volume identifier in log record */ 151 pxd_t logpxd; /* pxd describing log */ 152 pxd_t fsckpxd; /* pxd describing fsck wkspc */ 153 pxd_t ait2; /* pxd describing AIT copy */ 154 char uuid[16]; /* 128-bit uuid for volume */ 155 char loguuid[16]; /* 128-bit uuid for log */ 156 /* 157 * commit_state is used for synchronization of the jfs_commit 158 * threads. It is protected by LAZY_LOCK(). 159 */ 160 int commit_state; /* commit state */ 161 /* Formerly in ipimap */ 162 uint gengen; /* inode generation generator*/ 163 uint inostamp; /* shows inode belongs to fileset*/ 164 165 /* Formerly in ipbmap */ 166 struct bmap *bmap; /* incore bmap descriptor */ 167 struct nls_table *nls_tab; /* current codepage */ 168 uint state; /* mount/recovery state */ 169 unsigned long flag; /* mount time flags */ 170 uint p_state; /* state prior to going no integrity */ 171 }; 172 173 /* jfs_sb_info commit_state */ 174 #define IN_LAZYCOMMIT 1 175 176 static inline struct jfs_inode_info *JFS_IP(struct inode *inode) 177 { 178 return list_entry(inode, struct jfs_inode_info, vfs_inode); 179 } 180 181 static inline int jfs_dirtable_inline(struct inode *inode) 182 { 183 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); 184 } 185 186 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) 187 { 188 return sb->s_fs_info; 189 } 190 191 static inline int isReadOnly(struct inode *inode) 192 { 193 if (JFS_SBI(inode->i_sb)->log) 194 return 0; 195 return 1; 196 } 197 #endif /* _H_JFS_INCORE */ 198