linux/fs/jfs/jfs_incore.h
<<
>>
Prefs
   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        u64     agstart;        /* agstart of the containing IAG */
  54        u16     bxflag;         /* xflag of pseudo buffer?      */
  55        unchar  pad;
  56        signed char active_ag;  /* ag currently allocating from */
  57        lid_t   blid;           /* lid of pseudo buffer?        */
  58        lid_t   atlhead;        /* anonymous tlock list head    */
  59        lid_t   atltail;        /* anonymous tlock list tail    */
  60        spinlock_t ag_lock;     /* protects active_ag           */
  61        struct list_head anon_inode_list; /* inodes having anonymous txns */
  62        /*
  63         * rdwrlock serializes xtree between reads & writes and synchronizes
  64         * changes to special inodes.  It's use would be redundant on
  65         * directories since the i_mutex taken in the VFS is sufficient.
  66         */
  67        struct rw_semaphore rdwrlock;
  68        /*
  69         * commit_mutex serializes transaction processing on an inode.
  70         * It must be taken after beginning a transaction (txBegin), since
  71         * dirty inodes may be committed while a new transaction on the
  72         * inode is blocked in txBegin or TxBeginAnon
  73         */
  74        struct mutex commit_mutex;
  75        /* xattr_sem allows us to access the xattrs without taking i_mutex */
  76        struct rw_semaphore xattr_sem;
  77        lid_t   xtlid;          /* lid of xtree lock on directory */
  78        union {
  79                struct {
  80                        xtpage_t _xtroot;       /* 288: xtree root */
  81                        struct inomap *_imap;   /* 4: inode map header  */
  82                } file;
  83                struct {
  84                        struct dir_table_slot _table[12]; /* 96: dir index */
  85                        dtroot_t _dtroot;       /* 288: dtree root */
  86                } dir;
  87                struct {
  88                        unchar _unused[16];     /* 16: */
  89                        dxd_t _dxd;             /* 16: */
  90                        unchar _inline[128];    /* 128: inline symlink */
  91                        /* _inline_ea may overlay the last part of
  92                         * file._xtroot if maxentry = XTROOTINITSLOT
  93                         */
  94                        unchar _inline_ea[128]; /* 128: inline extended attr */
  95                } link;
  96        } u;
  97        u32 dev;        /* will die when we get wide dev_t */
  98        struct inode    vfs_inode;
  99};
 100#define i_xtroot u.file._xtroot
 101#define i_imap u.file._imap
 102#define i_dirtable u.dir._table
 103#define i_dtroot u.dir._dtroot
 104#define i_inline u.link._inline
 105#define i_inline_ea u.link._inline_ea
 106
 107#define IREAD_LOCK(ip, subclass) \
 108        down_read_nested(&JFS_IP(ip)->rdwrlock, subclass)
 109#define IREAD_UNLOCK(ip)        up_read(&JFS_IP(ip)->rdwrlock)
 110#define IWRITE_LOCK(ip, subclass) \
 111        down_write_nested(&JFS_IP(ip)->rdwrlock, subclass)
 112#define IWRITE_UNLOCK(ip)       up_write(&JFS_IP(ip)->rdwrlock)
 113
 114/*
 115 * cflag
 116 */
 117enum cflags {
 118        COMMIT_Nolink,          /* inode committed with zero link count */
 119        COMMIT_Inlineea,        /* commit inode inline EA */
 120        COMMIT_Freewmap,        /* free WMAP at iClose() */
 121        COMMIT_Dirty,           /* Inode is really dirty */
 122        COMMIT_Dirtable,        /* commit changes to di_dirtable */
 123        COMMIT_Stale,           /* data extent is no longer valid */
 124        COMMIT_Synclist,        /* metadata pages on group commit synclist */
 125};
 126
 127/*
 128 * commit_mutex nesting subclasses:
 129 */
 130enum commit_mutex_class
 131{
 132        COMMIT_MUTEX_PARENT,
 133        COMMIT_MUTEX_CHILD,
 134        COMMIT_MUTEX_SECOND_PARENT,     /* Renaming */
 135        COMMIT_MUTEX_VICTIM             /* Inode being unlinked due to rename */
 136};
 137
 138/*
 139 * rdwrlock subclasses:
 140 * The dmap inode may be locked while a normal inode or the imap inode are
 141 * locked.
 142 */
 143enum rdwrlock_class
 144{
 145        RDWRLOCK_NORMAL,
 146        RDWRLOCK_IMAP,
 147        RDWRLOCK_DMAP
 148};
 149
 150#define set_cflag(flag, ip)     set_bit(flag, &(JFS_IP(ip)->cflag))
 151#define clear_cflag(flag, ip)   clear_bit(flag, &(JFS_IP(ip)->cflag))
 152#define test_cflag(flag, ip)    test_bit(flag, &(JFS_IP(ip)->cflag))
 153#define test_and_clear_cflag(flag, ip) \
 154        test_and_clear_bit(flag, &(JFS_IP(ip)->cflag))
 155/*
 156 * JFS-private superblock information.
 157 */
 158struct jfs_sb_info {
 159        struct super_block *sb;         /* Point back to vfs super block */
 160        unsigned long   mntflag;        /* aggregate attributes */
 161        struct inode    *ipbmap;        /* block map inode              */
 162        struct inode    *ipaimap;       /* aggregate inode map inode    */
 163        struct inode    *ipaimap2;      /* secondary aimap inode        */
 164        struct inode    *ipimap;        /* aggregate inode map inode    */
 165        struct jfs_log  *log;           /* log                  */
 166        struct list_head log_list;      /* volumes associated with a journal */
 167        short           bsize;          /* logical block size   */
 168        short           l2bsize;        /* log2 logical block size      */
 169        short           nbperpage;      /* blocks per page              */
 170        short           l2nbperpage;    /* log2 blocks per page */
 171        short           l2niperblk;     /* log2 inodes per page */
 172        dev_t           logdev;         /* external log device  */
 173        uint            aggregate;      /* volume identifier in log record */
 174        pxd_t           logpxd;         /* pxd describing log   */
 175        pxd_t           fsckpxd;        /* pxd describing fsck wkspc */
 176        pxd_t           ait2;           /* pxd describing AIT copy      */
 177        char            uuid[16];       /* 128-bit uuid for volume      */
 178        char            loguuid[16];    /* 128-bit uuid for log */
 179        /*
 180         * commit_state is used for synchronization of the jfs_commit
 181         * threads.  It is protected by LAZY_LOCK().
 182         */
 183        int             commit_state;   /* commit state */
 184        /* Formerly in ipimap */
 185        uint            gengen;         /* inode generation generator*/
 186        uint            inostamp;       /* shows inode belongs to fileset*/
 187
 188        /* Formerly in ipbmap */
 189        struct bmap     *bmap;          /* incore bmap descriptor       */
 190        struct nls_table *nls_tab;      /* current codepage             */
 191        struct inode *direct_inode;     /* metadata inode */
 192        uint            state;          /* mount/recovery state */
 193        unsigned long   flag;           /* mount time flags */
 194        uint            p_state;        /* state prior to going no integrity */
 195        uint            uid;            /* uid to override on-disk uid */
 196        uint            gid;            /* gid to override on-disk gid */
 197        uint            umask;          /* umask to override on-disk umask */
 198};
 199
 200/* jfs_sb_info commit_state */
 201#define IN_LAZYCOMMIT 1
 202
 203static inline struct jfs_inode_info *JFS_IP(struct inode *inode)
 204{
 205        return list_entry(inode, struct jfs_inode_info, vfs_inode);
 206}
 207
 208static inline int jfs_dirtable_inline(struct inode *inode)
 209{
 210        return (JFS_IP(inode)->next_index <= (MAX_INLINE_DIRTABLE_ENTRY + 1));
 211}
 212
 213static inline struct jfs_sb_info *JFS_SBI(struct super_block *sb)
 214{
 215        return sb->s_fs_info;
 216}
 217
 218static inline int isReadOnly(struct inode *inode)
 219{
 220        if (JFS_SBI(inode->i_sb)->log)
 221                return 0;
 222        return 1;
 223}
 224#endif /* _H_JFS_INCORE */
 225
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.