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 unsigned 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 union { 78 struct { 79 xtpage_t _xtroot; /* 288: xtree root */ 80 struct inomap *_imap; /* 4: inode map header */ 81 } file; 82 struct { 83 struct dir_table_slot _table[12]; /* 96: dir index */ 84 dtroot_t _dtroot; /* 288: dtree root */ 85 } dir; 86 struct { 87 unchar _unused[16]; /* 16: */ 88 dxd_t _dxd; /* 16: */ 89 unchar _inline[128]; /* 128: inline symlink */ 90 /* _inline_ea may overlay the last part of 91 * file._xtroot if maxentry = XTROOTINITSLOT 92 */ 93 unchar _inline_ea[128]; /* 128: inline extended attr */ 94 } link; 95 } u; 96 u32 dev; /* will die when we get wide dev_t */ 97 struct inode vfs_inode; 98}; 99#define i_xtroot u.file._xtroot 100#define i_imap u.file._imap 101#define i_dirtable u.dir._table 102#define i_dtroot u.dir._dtroot 103#define i_inline u.link._inline 104#define i_inline_ea u.link._inline_ea 105 106#define IREAD_LOCK(ip, subclass) \ 107 down_read_nested(&JFS_IP(ip)->rdwrlock, subclass) 108#define IREAD_UNLOCK(ip) up_read(&JFS_IP(ip)->rdwrlock) 109#define IWRITE_LOCK(ip, subclass) \ 110 down_write_nested(&JFS_IP(ip)->rdwrlock, subclass) 111#define IWRITE_UNLOCK(ip) up_write(&JFS_IP(ip)->rdwrlock) 112 113/* 114 * cflag 115 */ 116enum cflags { 117 COMMIT_Nolink, /* inode committed with zero link count */ 118 COMMIT_Inlineea, /* commit inode inline EA */ 119 COMMIT_Freewmap, /* free WMAP at iClose() */ 120 COMMIT_Dirty, /* Inode is really dirty */ 121 COMMIT_Dirtable, /* commit changes to di_dirtable */ 122 COMMIT_Stale, /* data extent is no longer valid */ 123 COMMIT_Synclist, /* metadata pages on group commit synclist */ 124}; 125 126/* 127 * commit_mutex nesting subclasses: 128 */ 129enum commit_mutex_class 130{ 131 COMMIT_MUTEX_PARENT, 132 COMMIT_MUTEX_CHILD, 133 COMMIT_MUTEX_SECOND_PARENT, /* Renaming */ 134 COMMIT_MUTEX_VICTIM /* Inode being unlinked due to rename */ 135}; 136 137/* 138 * rdwrlock subclasses: 139 * The dmap inode may be locked while a normal inode or the imap inode are 140 * locked. 141 */ 142enum rdwrlock_class 143{ 144 RDWRLOCK_NORMAL, 145 RDWRLOCK_IMAP, 146 RDWRLOCK_DMAP 147}; 148 149#define set_cflag(flag, ip) set_bit(flag, &(JFS_IP(ip)->cflag)) 150#define clear_cflag(flag, ip) clear_bit(flag, &(JFS_IP(ip)->cflag)) 151#define test_cflag(flag, ip) test_bit(flag, &(JFS_IP(ip)->cflag)) 152#define test_and_clear_cflag(flag, ip) \ 153 test_and_clear_bit(flag, &(JFS_IP(ip)->cflag)) 154/* 155 * JFS-private superblock information. 156 */ 157struct jfs_sb_info { 158 struct super_block *sb; /* Point back to vfs super block */ 159 unsigned long mntflag; /* aggregate attributes */ 160 struct inode *ipbmap; /* block map inode */ 161 struct inode *ipaimap; /* aggregate inode map inode */ 162 struct inode *ipaimap2; /* secondary aimap inode */ 163 struct inode *ipimap; /* aggregate inode map inode */ 164 struct jfs_log *log; /* log */ 165 struct list_head log_list; /* volumes associated with a journal */ 166 short bsize; /* logical block size */ 167 short l2bsize; /* log2 logical block size */ 168 short nbperpage; /* blocks per page */ 169 short l2nbperpage; /* log2 blocks per page */ 170 short l2niperblk; /* log2 inodes per page */ 171 dev_t logdev; /* external log device */ 172 uint aggregate; /* volume identifier in log record */ 173 pxd_t logpxd; /* pxd describing log */ 174 pxd_t fsckpxd; /* pxd describing fsck wkspc */ 175 pxd_t ait2; /* pxd describing AIT copy */ 176 char uuid[16]; /* 128-bit uuid for volume */ 177 char loguuid[16]; /* 128-bit uuid for log */ 178 /* 179 * commit_state is used for synchronization of the jfs_commit 180 * threads. It is protected by LAZY_LOCK(). 181 */ 182 int commit_state; /* commit state */ 183 /* Formerly in ipimap */ 184 uint gengen; /* inode generation generator*/ 185 uint inostamp; /* shows inode belongs to fileset*/ 186 187 /* Formerly in ipbmap */ 188 struct bmap *bmap; /* incore bmap descriptor */ 189 struct nls_table *nls_tab; /* current codepage */ 190 struct inode *direct_inode; /* metadata inode */ 191 uint state; /* mount/recovery state */ 192 unsigned long flag; /* mount time flags */ 193 uint p_state; /* state prior to going no integrity */ 194 uint uid; /* uid to override on-disk uid */ 195 uint gid; /* gid to override on-disk gid */ 196 uint umask; /* umask to override on-disk umask */ 197}; 198 199/* jfs_sb_info commit_state */ 200#define IN_LAZYCOMMIT 1 201 202static inline struct jfs_inode_info *JFS_IP(struct inode *inode) 203{ 204 return list_entry(inode, struct jfs_inode_info, vfs_inode); 205} 206 207static inline int jfs_dirtable_inline(struct inode *inode) 208{ 209 return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1)); 210} 211 212static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb) 213{ 214 return sb->s_fs_info; 215} 216 217static inline int isReadOnly(struct inode *inode) 218{ 219 if (JFS_SBI(inode->i_sb)->log) 220 return 0; 221 return 1; 222} 223#endif /* _H_JFS_INCORE */ 224