fs/jfs/jfs_incore.h

   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         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  */
 116 enum 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  */
 129 enum 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  */
 142 enum 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  */
 157 struct 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
 202 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 203 {
 204         return list_entry(inode, struct jfs_inode_info, vfs_inode);
 205 }
 206
 207 static inline int jfs_dirtable_inline(struct inode *inode)
 208 {
 209         return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
 210 }
 211
 212 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 213 {
 214         return sb->s_fs_info;
 215 }
 216
 217 static 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 */