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 <linux/uuid.h>
  27
  28 #include "jfs_types.h"
  29 #include "jfs_xtree.h"
  30 #include "jfs_dtree.h"
  31
  32 /*
  33  * JFS magic number
  34  */
  35 #define JFS_SUPER_MAGIC 0x3153464a /* "JFS1" */
  36
  37 /*
  38  * JFS-private inode information
  39  */
  40 struct jfs_inode_info {
  41         int     fileset;        /* fileset number (always 16)*/
  42         uint    mode2;          /* jfs-specific mode            */
  43         kuid_t  saved_uid;      /* saved for uid mount option */
  44         kgid_t  saved_gid;      /* saved for gid mount option */
  45         pxd_t   ixpxd;          /* inode extent descriptor      */
  46         dxd_t   acl;            /* dxd describing acl   */
  47         dxd_t   ea;             /* dxd describing ea    */
  48         time64_t otime;         /* time created */
  49         uint    next_index;     /* next available directory entry index */
  50         int     acltype;        /* Type of ACL  */
  51         short   btorder;        /* access order */
  52         short   btindex;        /* btpage entry index*/
  53         struct inode *ipimap;   /* inode map                    */
  54         unsigned long cflag;    /* commit flags         */
  55         u64     agstart;        /* agstart of the containing IAG */
  56         u16     bxflag;         /* xflag of pseudo buffer?      */
  57         unchar  pad;
  58         signed char active_ag;  /* ag currently allocating from */
  59         lid_t   blid;           /* lid of pseudo buffer?        */
  60         lid_t   atlhead;        /* anonymous tlock list head    */
  61         lid_t   atltail;        /* anonymous tlock list tail    */
  62         spinlock_t ag_lock;     /* protects active_ag           */
  63         struct list_head anon_inode_list; /* inodes having anonymous txns */
  64         /*
  65          * rdwrlock serializes xtree between reads & writes and synchronizes
  66          * changes to special inodes.  It's use would be redundant on
  67          * directories since the i_mutex taken in the VFS is sufficient.
  68          */
  69         struct rw_semaphore rdwrlock;
  70         /*
  71          * commit_mutex serializes transaction processing on an inode.
  72          * It must be taken after beginning a transaction (txBegin), since
  73          * dirty inodes may be committed while a new transaction on the
  74          * inode is blocked in txBegin or TxBeginAnon
  75          */
  76         struct mutex commit_mutex;
  77         /* xattr_sem allows us to access the xattrs without taking i_mutex */
  78         struct rw_semaphore xattr_sem;
  79         lid_t   xtlid;          /* lid of xtree lock on directory */
  80         union {
  81                 struct {
  82                         xtpage_t _xtroot;       /* 288: xtree root */
  83                         struct inomap *_imap;   /* 4: inode map header  */
  84                 } file;
  85                 struct {
  86                         struct dir_table_slot _table[12]; /* 96: dir index */
  87                         dtroot_t _dtroot;       /* 288: dtree root */
  88                 } dir;
  89                 struct {
  90                         unchar _unused[16];     /* 16: */
  91                         dxd_t _dxd;             /* 16: */
  92                         /* _inline may overflow into _inline_ea when needed */
  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 #ifdef CONFIG_QUOTA
 101         struct dquot *i_dquot[MAXQUOTAS];
 102 #endif
 103         u32 dev;        /* will die when we get wide dev_t */
 104         struct inode    vfs_inode;
 105 };
 106 #define i_xtroot u.file._xtroot
 107 #define i_imap u.file._imap
 108 #define i_dirtable u.dir._table
 109 #define i_dtroot u.dir._dtroot
 110 #define i_inline u.link._inline
 111 #define i_inline_ea u.link._inline_ea
 112
 113 #define IREAD_LOCK(ip, subclass) \
 114         down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
 115 #define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
 116 #define IWRITE_LOCK(ip, subclass) \
 117         down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
 118 #define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
 119
 120 /*
 121  * cflag
 122  */
 123 enum cflags {
 124         COMMIT_Nolink,          /* inode committed with zero link count */
 125         COMMIT_Inlineea,        /* commit inode inline EA */
 126         COMMIT_Freewmap,        /* free WMAP at iClose() */
 127         COMMIT_Dirty,           /* Inode is really dirty */
 128         COMMIT_Dirtable,        /* commit changes to di_dirtable */
 129         COMMIT_Stale,           /* data extent is no longer valid */
 130         COMMIT_Synclist,        /* metadata pages on group commit synclist */
 131 };
 132
 133 /*
 134  * commit_mutex nesting subclasses:
 135  */
 136 enum commit_mutex_class
 137 {
 138         COMMIT_MUTEX_PARENT,
 139         COMMIT_MUTEX_CHILD,
 140         COMMIT_MUTEX_SECOND_PARENT,     /* Renaming */
 141         COMMIT_MUTEX_VICTIM             /* Inode being unlinked due to rename */
 142 };
 143
 144 /*
 145  * rdwrlock subclasses:
 146  * The dmap inode may be locked while a normal inode or the imap inode are
 147  * locked.
 148  */
 149 enum rdwrlock_class
 150 {
 151         RDWRLOCK_NORMAL,
 152         RDWRLOCK_IMAP,
 153         RDWRLOCK_DMAP
 154 };
 155
 156 #define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
 157 #define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
 158 #define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))
 159 #define test_and_clear_cflag(flag, ip) \
 160         test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
 161 /*
 162  * JFS-private superblock information.
 163  */
 164 struct jfs_sb_info {
 165         struct super_block *sb;         /* Point back to vfs super block */
 166         unsigned long   mntflag;        /* aggregate attributes */
 167         struct inode    *ipbmap;        /* block map inode              */
 168         struct inode    *ipaimap;       /* aggregate inode map inode    */
 169         struct inode    *ipaimap2;      /* secondary aimap inode        */
 170         struct inode    *ipimap;        /* aggregate inode map inode    */
 171         struct jfs_log  *log;           /* log                  */
 172         struct list_head log_list;      /* volumes associated with a journal */
 173         short           bsize;          /* logical block size   */
 174         short           l2bsize;        /* log2 logical block size      */
 175         short           nbperpage;      /* blocks per page              */
 176         short           l2nbperpage;    /* log2 blocks per page */
 177         short           l2niperblk;     /* log2 inodes per page */
 178         dev_t           logdev;         /* external log device  */
 179         uint            aggregate;      /* volume identifier in log record */
 180         pxd_t           logpxd;         /* pxd describing log   */
 181         pxd_t           fsckpxd;        /* pxd describing fsck wkspc */
 182         pxd_t           ait2;           /* pxd describing AIT copy      */
 183         uuid_t          uuid;           /* 128-bit uuid for volume      */
 184         uuid_t          loguuid;        /* 128-bit uuid for log */
 185         /*
 186          * commit_state is used for synchronization of the jfs_commit
 187          * threads.  It is protected by LAZY_LOCK().
 188          */
 189         int             commit_state;   /* commit state */
 190         /* Formerly in ipimap */
 191         uint            gengen;         /* inode generation generator*/
 192         uint            inostamp;       /* shows inode belongs to fileset*/
 193
 194         /* Formerly in ipbmap */
 195         struct bmap     *bmap;          /* incore bmap descriptor       */
 196         struct nls_table *nls_tab;      /* current codepage             */
 197         struct inode *direct_inode;     /* metadata inode */
 198         uint            state;          /* mount/recovery state */
 199         unsigned long   flag;           /* mount time flags */
 200         uint            p_state;        /* state prior to going no integrity */
 201         kuid_t          uid;            /* uid to override on-disk uid */
 202         kgid_t          gid;            /* gid to override on-disk gid */
 203         uint            umask;          /* umask to override on-disk umask */
 204         uint            minblks_trim;   /* minimum blocks, for online trim */
 205 };
 206
 207 /* jfs_sb_info commit_state */
 208 #define IN_LAZYCOMMIT 1
 209
 210 static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 211 {
 212         return container_of(inode, struct jfs_inode_info, vfs_inode);
 213 }
 214
 215 static inline int jfs_dirtable_inline(struct inode *inode)
 216 {
 217         return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
 218 }
 219
 220 static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 221 {
 222         return sb->s_fs_info;
 223 }
 224
 225 static inline int isReadOnly(struct inode *inode)
 226 {
 227         if (JFS_SBI(inode->i_sb)->log)
 228                 return 0;
 229         return 1;
 230 }
 231 #endif /* _H_JFS_INCORE */