linux/fs/jfs/jfs_imap.h
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   1/*
   2 *   Copyright (C) International Business Machines Corp., 2000-2002
   3 *
   4 *   This program is free software;  you can redistribute it and/or modify
   5 *   it under the terms of the GNU General Public License as published by
   6 *   the Free Software Foundation; either version 2 of the License, or
   7 *   (at your option) any later version.
   8 *
   9 *   This program is distributed in the hope that it will be useful,
  10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  12 *   the GNU General Public License for more details.
  13 *
  14 *   You should have received a copy of the GNU General Public License
  15 *   along with this program;  if not, write to the Free Software
  16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  17 */
  18#ifndef _H_JFS_IMAP
  19#define _H_JFS_IMAP
  20
  21#include "jfs_txnmgr.h"
  22
  23/*
  24 *      jfs_imap.h: disk inode manager
  25 */
  26
  27#define EXTSPERIAG      128     /* number of disk inode extent per iag  */
  28#define IMAPBLKNO       0       /* lblkno of dinomap within inode map   */
  29#define SMAPSZ          4       /* number of words per summary map      */
  30#define EXTSPERSUM      32      /* number of extents per summary map entry */
  31#define L2EXTSPERSUM    5       /* l2 number of extents per summary map */
  32#define PGSPERIEXT      4       /* number of 4K pages per dinode extent */
  33#define MAXIAGS         ((1<<20)-1)     /* maximum number of iags       */
  34#define MAXAG           128     /* maximum number of allocation groups  */
  35
  36#define AMAPSIZE        512     /* bytes in the IAG allocation maps */
  37#define SMAPSIZE        16      /* bytes in the IAG summary maps */
  38
  39/* convert inode number to iag number */
  40#define INOTOIAG(ino)   ((ino) >> L2INOSPERIAG)
  41
  42/* convert iag number to logical block number of the iag page */
  43#define IAGTOLBLK(iagno,l2nbperpg)      (((iagno) + 1) << (l2nbperpg))
  44
  45/* get the starting block number of the 4K page of an inode extent
  46 * that contains ino.
  47 */
  48#define INOPBLK(pxd,ino,l2nbperpg)      (addressPXD((pxd)) +            \
  49        ((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
  50
  51/*
  52 *      inode allocation map:
  53 *
  54 * inode allocation map consists of
  55 * . the inode map control page and
  56 * . inode allocation group pages (per 4096 inodes)
  57 * which are addressed by standard JFS xtree.
  58 */
  59/*
  60 *      inode allocation group page (per 4096 inodes of an AG)
  61 */
  62struct iag {
  63        __le64 agstart;         /* 8: starting block of ag              */
  64        __le32 iagnum;          /* 4: inode allocation group number     */
  65        __le32 inofreefwd;      /* 4: ag inode free list forward        */
  66        __le32 inofreeback;     /* 4: ag inode free list back           */
  67        __le32 extfreefwd;      /* 4: ag inode extent free list forward */
  68        __le32 extfreeback;     /* 4: ag inode extent free list back    */
  69        __le32 iagfree;         /* 4: iag free list                     */
  70
  71        /* summary map: 1 bit per inode extent */
  72        __le32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
  73                                 *      note: this indicates free and backed
  74                                 *      inodes, if the extent is not backed the
  75                                 *      value will be 1.  if the extent is
  76                                 *      backed but all inodes are being used the
  77                                 *      value will be 1.  if the extent is
  78                                 *      backed but at least one of the inodes is
  79                                 *      free the value will be 0.
  80                                 */
  81        __le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
  82        __le32 nfreeinos;       /* 4: number of free inodes             */
  83        __le32 nfreeexts;       /* 4: number of free extents            */
  84        /* (72) */
  85        u8 pad[1976];           /* 1976: pad to 2048 bytes */
  86        /* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
  87        __le32 wmap[EXTSPERIAG];        /* 512: working allocation map */
  88        __le32 pmap[EXTSPERIAG];        /* 512: persistent allocation map */
  89        pxd_t inoext[EXTSPERIAG];       /* 1024: inode extent addresses */
  90};                              /* (4096) */
  91
  92/*
  93 *      per AG control information (in inode map control page)
  94 */
  95struct iagctl_disk {
  96        __le32 inofree;         /* 4: free inode list anchor            */
  97        __le32 extfree;         /* 4: free extent list anchor           */
  98        __le32 numinos;         /* 4: number of backed inodes           */
  99        __le32 numfree;         /* 4: number of free inodes             */
 100};                              /* (16) */
 101
 102struct iagctl {
 103        int inofree;            /* free inode list anchor               */
 104        int extfree;            /* free extent list anchor              */
 105        int numinos;            /* number of backed inodes              */
 106        int numfree;            /* number of free inodes                */
 107};
 108
 109/*
 110 *      per fileset/aggregate inode map control page
 111 */
 112struct dinomap_disk {
 113        __le32 in_freeiag;      /* 4: free iag list anchor      */
 114        __le32 in_nextiag;      /* 4: next free iag number      */
 115        __le32 in_numinos;      /* 4: num of backed inodes      */
 116        __le32 in_numfree;      /* 4: num of free backed inodes */
 117        __le32 in_nbperiext;    /* 4: num of blocks per inode extent */
 118        __le32 in_l2nbperiext;  /* 4: l2 of in_nbperiext        */
 119        __le32 in_diskblock;    /* 4: for standalone test driver */
 120        __le32 in_maxag;        /* 4: for standalone test driver */
 121        u8 pad[2016];           /* 2016: pad to 2048            */
 122        struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
 123};                              /* (4096) */
 124
 125struct dinomap {
 126        int in_freeiag;         /* free iag list anchor         */
 127        int in_nextiag;         /* next free iag number         */
 128        int in_numinos;         /* num of backed inodes         */
 129        int in_numfree;         /* num of free backed inodes    */
 130        int in_nbperiext;       /* num of blocks per inode extent */
 131        int in_l2nbperiext;     /* l2 of in_nbperiext           */
 132        int in_diskblock;       /* for standalone test driver   */
 133        int in_maxag;           /* for standalone test driver   */
 134        struct iagctl in_agctl[MAXAG];  /* AG control information */
 135};
 136
 137/*
 138 *      In-core inode map control page
 139 */
 140struct inomap {
 141        struct dinomap im_imap;         /* 4096: inode allocation control */
 142        struct inode *im_ipimap;        /* 4: ptr to inode for imap     */
 143        struct mutex im_freelock;       /* 4: iag free list lock        */
 144        struct mutex im_aglock[MAXAG];  /* 512: per AG locks            */
 145        u32 *im_DBGdimap;
 146        atomic_t im_numinos;    /* num of backed inodes */
 147        atomic_t im_numfree;    /* num of free backed inodes */
 148};
 149
 150#define im_freeiag      im_imap.in_freeiag
 151#define im_nextiag      im_imap.in_nextiag
 152#define im_agctl        im_imap.in_agctl
 153#define im_nbperiext    im_imap.in_nbperiext
 154#define im_l2nbperiext  im_imap.in_l2nbperiext
 155
 156/* for standalone testdriver
 157 */
 158#define im_diskblock    im_imap.in_diskblock
 159#define im_maxag        im_imap.in_maxag
 160
 161extern int diFree(struct inode *);
 162extern int diAlloc(struct inode *, bool, struct inode *);
 163extern int diSync(struct inode *);
 164/* external references */
 165extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
 166                        bool is_free, struct tblock * tblk);
 167extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
 168extern int diMount(struct inode *);
 169extern int diUnmount(struct inode *, int);
 170extern int diRead(struct inode *);
 171extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
 172extern void diWriteSpecial(struct inode *, int);
 173extern void diFreeSpecial(struct inode *);
 174extern int diWrite(tid_t tid, struct inode *);
 175#endif                          /* _H_JFS_IMAP */
 176
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