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         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 #ifdef CONFIG_JFS_POSIX_ACL
  78         struct posix_acl *i_acl;
  79         struct posix_acl *i_default_acl;
  80 #endif
  81         union {
  82                 struct {
  83                         xtpage_t _xtroot;       /* 288: xtree root */
  84                         struct inomap *_imap;   /* 4: inode map header  */
  85                 } file;
  86                 struct {
  87                         struct dir_table_slot _table[12]; /* 96: dir index */
  88                         dtroot_t _dtroot;       /* 288: dtree root */
  89                 } dir;
  90                 struct {
  91                         unchar _unused[16];     /* 16: */
  92                         dxd_t _dxd;             /* 16: */
  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         u32 dev;        /* will die when we get wide dev_t */
 101         struct inode    vfs_inode;
 102 };
 103 #define i_xtroot u.file._xtroot
 104 #define i_imap u.file._imap
 105 #define i_dirtable u.dir._table
 106 #define i_dtroot u.dir._dtroot
 107 #define i_inline u.link._inline
 108 #define i_inline_ea u.link._inline_ea
 109
 110 #define JFS_ACL_NOT_CACHED ((void *)-1)
 111
 112 #define IREAD_LOCK(ip, subclass) \
 113         down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
 114 #define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
 115 #define IWRITE_LOCK(ip, subclass) \
 116         down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
 117 #define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
 118
 119 /*
 120  * cflag
 121  */
 122 enum cflags {
 123         COMMIT_Nolink,          /* inode committed with zero link count */
 124         COMMIT_Inlineea,        /* commit inode inline EA */
 125         COMMIT_Freewmap,        /* free WMAP at iClose() */
 126         COMMIT_Dirty,           /* Inode is really dirty */
 127         COMMIT_Dirtable,        /* commit changes to di_dirtable */
 128         COMMIT_Stale,           /* data extent is no longer valid */
 129         COMMIT_Synclist,        /* metadata pages on group commit synclist */
 130 };
 131
 132 /*
 133  * commit_mutex nesting subclasses:
 134  */
 135 enum commit_mutex_class
 136 {
 137         COMMIT_MUTEX_PARENT,
 138         COMMIT_MUTEX_CHILD,
 139         COMMIT_MUTEX_SECOND_PARENT,     /* Renaming */
 140         COMMIT_MUTEX_VICTIM             /* Inode being unlinked due to rename */
 141 };
 142
 143 /*
 144  * rdwrlock subclasses:
 145  * The dmap inode may be locked while a normal inode or the imap inode are
 146  * locked.
 147  */
 148 enum rdwrlock_class
 149 {
 150         RDWRLOCK_NORMAL,
 151         RDWRLOCK_IMAP,
 152         RDWRLOCK_DMAP
 153 };
 154
 155 #define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
 156 #define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
 157 #define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))
 158 #define test_and_clear_cflag(flag, ip) \
 159         test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
 160 /*
 161  * JFS-private superblock information.
 162  */
 163 struct jfs_sb_info {
 164         struct super_block *sb;         /* Point back to vfs super block */
 165         unsigned long   mntflag;        /* aggregate attributes */
 166         struct inode    *ipbmap;        /* block map inode              */
 167         struct inode    *ipaimap;       /* aggregate inode map inode    */
 168         struct inode    *ipaimap2;      /* secondary aimap inode        */
 169         struct inode    *ipimap;        /* aggregate inode map inode    */
 170         struct jfs_log  *log;           /* log                  */
 171         struct list_head log_list;      /* volumes associated with a journal */
 172         short           bsize;          /* logical block size   */
 173         short           l2bsize;        /* log2 logical block size      */
 174         short           nbperpage;      /* blocks per page              */
 175         short           l2nbperpage;    /* log2 blocks per page */
 176         short           l2niperblk;     /* log2 inodes per page */
 177         dev_t           logdev;         /* external log device  */
 178         uint            aggregate;      /* volume identifier in log record */
 179         pxd_t           logpxd;         /* pxd describing log   */
 180         pxd_t           fsckpxd;        /* pxd describing fsck wkspc */
 181         pxd_t           ait2;           /* pxd describing AIT copy      */
 182         char            uuid[16];       /* 128-bit uuid for volume      */
 183         char            loguuid[16];    /* 128-bit uuid for log */
 184         /*
 185          * commit_state is used for synchronization of the jfs_commit
 186          * threads.  It is protected by LAZY_LOCK().
 187          */
 188         int             commit_state;   /* commit state */
 189         /* Formerly in ipimap */
 190         uint            gengen;         /* inode generation generator*/
 191         uint            inostamp;       /* shows inode belongs to fileset*/
 192
 193         /* Formerly in ipbmap */
 194         struct bmap     *bmap;          /* incore bmap descriptor       */
 195         struct nls_table *nls_tab;      /* current codepage             */
 196         struct inode *direct_inode;     /* metadata inode */
 197         uint            state;          /* mount/recovery state */
 198         unsigned long   flag;           /* mount time flags */
 199         uint            p_state;        /* state prior to going no integrity */
 200         uint            uid;            /* uid to override on-disk uid */
 201         uint            gid;            /* gid to override on-disk gid */
 202         uint            umask;          /* umask to override on-disk umask */
 203 };
 204
 205 /* jfs_sb_info commit_state */
 206 #define IN_LAZYCOMMIT 1
 207
 208 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 209 {
 210         return list_entry(inode, struct jfs_inode_info, vfs_inode);
 211 }
 212
 213 static inline int jfs_dirtable_inline(struct inode *inode)
 214 {
 215         return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
 216 }
 217
 218 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 219 {
 220         return sb->s_fs_info;
 221 }
 222
 223 static inline int isReadOnly(struct inode *inode)
 224 {
 225         if (JFS_SBI(inode->i_sb)->log)
 226                 return 0;
 227         return 1;
 228 }
 229 #endif /* _H_JFS_INCORE */