fs/jfs/jfs_incore.h

   1 /*
   2  *   Copyright (c) International Business Machines Corp., 2000-2002
   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 <asm/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         struct list_head anon_inode_list; /* inodes having anonymous txns */
  57         /*
  58          * rdwrlock serializes xtree between reads & writes and synchronizes
  59          * changes to special inodes.  It's use would be redundant on
  60          * directories since the i_sem taken in the VFS is sufficient.
  61          */
  62         struct rw_semaphore rdwrlock;
  63         /*
  64          * commit_sem serializes transaction processing on an inode.
  65          * It must be taken after beginning a transaction (txBegin), since
  66          * dirty inodes may be committed while a new transaction on the
  67          * inode is blocked in txBegin or TxBeginAnon
  68          */
  69         struct semaphore commit_sem;
  70         lid_t   xtlid;          /* lid of xtree lock on directory */
  71 #ifdef CONFIG_JFS_POSIX_ACL
  72         struct posix_acl *i_acl;
  73         struct posix_acl *i_default_acl;
  74 #endif
  75         union {
  76                 struct {
  77                         xtpage_t _xtroot;       /* 288: xtree root */
  78                         struct inomap *_imap;   /* 4: inode map header  */
  79                 } file;
  80                 struct {
  81                         struct dir_table_slot _table[12]; /* 96: dir index */
  82                         dtroot_t _dtroot;       /* 288: dtree root */
  83                 } dir;
  84                 struct {
  85                         unchar _unused[16];     /* 16: */
  86                         dxd_t _dxd;             /* 16: */
  87                         unchar _inline[128];    /* 128: inline symlink */
  88                         /* _inline_ea may overlay the last part of
  89                          * file._xtroot if maxentry = XTROOTINITSLOT
  90                          */
  91                         unchar _inline_ea[128]; /* 128: inline extended attr */
  92                 } link;
  93         } u;
  94         struct inode    vfs_inode;
  95 };
  96 #define i_xtroot u.file._xtroot
  97 #define i_imap u.file._imap
  98 #define i_dirtable u.dir._table
  99 #define i_dtroot u.dir._dtroot
 100 #define i_inline u.link._inline
 101 #define i_inline_ea u.link._inline_ea
 102
 103 #define JFS_ACL_NOT_CACHED ((void *)-1)
 104
 105 #define IREAD_LOCK(ip)          down_read(&JFS_IP(ip)->rdwrlock)
 106 #define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
 107 #define IWRITE_LOCK(ip)         down_write(&JFS_IP(ip)->rdwrlock)
 108 #define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
 109
 110 /*
 111  * cflag
 112  */
 113 enum cflags {
 114         COMMIT_New,             /* never committed inode   */
 115         COMMIT_Nolink,          /* inode committed with zero link count */
 116         COMMIT_Inlineea,        /* commit inode inline EA */
 117         COMMIT_Freewmap,        /* free WMAP at iClose() */
 118         COMMIT_Dirty,           /* Inode is really dirty */
 119         COMMIT_Dirtable,        /* commit changes to di_dirtable */
 120         COMMIT_Stale,           /* data extent is no longer valid */
 121         COMMIT_Synclist,        /* metadata pages on group commit synclist */
 122 };
 123
 124 #define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
 125 #define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
 126 #define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))
 127 #define test_and_clear_cflag(flag, ip) \
 128         test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
 129 /*
 130  * JFS-private superblock information.
 131  */
 132 struct jfs_sb_info {
 133         unsigned long   mntflag;        /* 4: aggregate attributes      */
 134         struct inode    *ipbmap;        /* 4: block map inode           */
 135         struct inode    *ipaimap;       /* 4: aggregate inode map inode */
 136         struct inode    *ipaimap2;      /* 4: secondary aimap inode     */
 137         struct inode    *ipimap;        /* 4: aggregate inode map inode */
 138         struct jfs_log  *log;           /* 4: log                       */
 139         short           bsize;          /* 2: logical block size        */
 140         short           l2bsize;        /* 2: log2 logical block size   */
 141         short           nbperpage;      /* 2: blocks per page           */
 142         short           l2nbperpage;    /* 2: log2 blocks per page      */
 143         short           l2niperblk;     /* 2: log2 inodes per page      */
 144         u32             logdev;         /* 2: external log device       */
 145         uint            aggregate;      /* volume identifier in log record */
 146         pxd_t           logpxd;         /* 8: pxd describing log        */
 147         pxd_t           fsckpxd;        /* 8: pxd describing fsck wkspc */
 148         pxd_t           ait2;           /* 8: pxd describing AIT copy   */
 149         char            uuid[16];       /* 16: 128-bit uuid for volume  */
 150         char            loguuid[16];    /* 16: 128-bit uuid for log     */
 151         /* Formerly in ipimap */
 152         uint            gengen;         /* 4: inode generation generator*/
 153         uint            inostamp;       /* 4: shows inode belongs to fileset*/
 154
 155         /* Formerly in ipbmap */
 156         struct bmap     *bmap;          /* 4: incore bmap descriptor    */
 157         struct nls_table *nls_tab;      /* 4: current codepage          */
 158         uint            state;          /* 4: mount/recovery state      */
 159 };
 160
 161 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 162 {
 163         return list_entry(inode, struct jfs_inode_info, vfs_inode);
 164 }
 165
 166 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 167 {
 168         return sb->s_fs_info;
 169 }
 170
 171 static inline int isReadOnly(struct inode *inode)
 172 {
 173         if (JFS_SBI(inode->i_sb)->log)
 174                 return 0;
 175         return 1;
 176 }
 177
 178 #endif /* _H_JFS_INCORE */