LXR linux/fs/jfs/jfs

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *   Copyright (C) International Business Machines Corp., 2000-2002
   4 */
   5#ifndef _H_JFS_IMAP
   6#define _H_JFS_IMAP
   7
   8#include "jfs_txnmgr.h"
   9
  10/*
  11 *      jfs_imap.h: disk inode manager
  12 */
  13
  14#define EXTSPERIAG      128     /* number of disk inode extent per iag  */
  15#define IMAPBLKNO       0       /* lblkno of dinomap within inode map   */
  16#define SMAPSZ          4       /* number of words per summary map      */
  17#define EXTSPERSUM      32      /* number of extents per summary map entry */
  18#define L2EXTSPERSUM    5       /* l2 number of extents per summary map */
  19#define PGSPERIEXT      4       /* number of 4K pages per dinode extent */
  20#define MAXIAGS         ((1<<20)-1)     /* maximum number of iags       */
  21#define MAXAG           128     /* maximum number of allocation groups  */
  22
  23#define AMAPSIZE        512     /* bytes in the IAG allocation maps */
  24#define SMAPSIZE        16      /* bytes in the IAG summary maps */
  25
  26/* convert inode number to iag number */
  27#define INOTOIAG(ino)   ((ino) >> L2INOSPERIAG)
  28
  29/* convert iag number to logical block number of the iag page */
  30#define IAGTOLBLK(iagno,l2nbperpg)      (((iagno) + 1) << (l2nbperpg))
  31
  32/* get the starting block number of the 4K page of an inode extent
  33 * that contains ino.
  34 */
  35#define INOPBLK(pxd,ino,l2nbperpg)      (addressPXD((pxd)) +            \
  36        ((((ino) & (INOSPEREXT-1)) >> L2INOSPERPAGE) << (l2nbperpg)))
  37
  38/*
  39 *      inode allocation map:
  40 *
  41 * inode allocation map consists of
  42 * . the inode map control page and
  43 * . inode allocation group pages (per 4096 inodes)
  44 * which are addressed by standard JFS xtree.
  45 */
  46/*
  47 *      inode allocation group page (per 4096 inodes of an AG)
  48 */
  49struct iag {
  50        __le64 agstart;         /* 8: starting block of ag              */
  51        __le32 iagnum;          /* 4: inode allocation group number     */
  52        __le32 inofreefwd;      /* 4: ag inode free list forward        */
  53        __le32 inofreeback;     /* 4: ag inode free list back           */
  54        __le32 extfreefwd;      /* 4: ag inode extent free list forward */
  55        __le32 extfreeback;     /* 4: ag inode extent free list back    */
  56        __le32 iagfree;         /* 4: iag free list                     */
  57
  58        /* summary map: 1 bit per inode extent */
  59        __le32 inosmap[SMAPSZ]; /* 16: sum map of mapwords w/ free inodes;
  60                                 *      note: this indicates free and backed
  61                                 *      inodes, if the extent is not backed the
  62                                 *      value will be 1.  if the extent is
  63                                 *      backed but all inodes are being used the
  64                                 *      value will be 1.  if the extent is
  65                                 *      backed but at least one of the inodes is
  66                                 *      free the value will be 0.
  67                                 */
  68        __le32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */
  69        __le32 nfreeinos;       /* 4: number of free inodes             */
  70        __le32 nfreeexts;       /* 4: number of free extents            */
  71        /* (72) */
  72        u8 pad[1976];           /* 1976: pad to 2048 bytes */
  73        /* allocation bit map: 1 bit per inode (0 - free, 1 - allocated) */
  74        __le32 wmap[EXTSPERIAG];        /* 512: working allocation map */
  75        __le32 pmap[EXTSPERIAG];        /* 512: persistent allocation map */
  76        pxd_t inoext[EXTSPERIAG];       /* 1024: inode extent addresses */
  77};                              /* (4096) */
  78
  79/*
  80 *      per AG control information (in inode map control page)
  81 */
  82struct iagctl_disk {
  83        __le32 inofree;         /* 4: free inode list anchor            */
  84        __le32 extfree;         /* 4: free extent list anchor           */
  85        __le32 numinos;         /* 4: number of backed inodes           */
  86        __le32 numfree;         /* 4: number of free inodes             */
  87};                              /* (16) */
  88
  89struct iagctl {
  90        int inofree;            /* free inode list anchor               */
  91        int extfree;            /* free extent list anchor              */
  92        int numinos;            /* number of backed inodes              */
  93        int numfree;            /* number of free inodes                */
  94};
  95
  96/*
  97 *      per fileset/aggregate inode map control page
  98 */
  99struct dinomap_disk {
 100        __le32 in_freeiag;      /* 4: free iag list anchor      */
 101        __le32 in_nextiag;      /* 4: next free iag number      */
 102        __le32 in_numinos;      /* 4: num of backed inodes      */
 103        __le32 in_numfree;      /* 4: num of free backed inodes */
 104        __le32 in_nbperiext;    /* 4: num of blocks per inode extent */
 105        __le32 in_l2nbperiext;  /* 4: l2 of in_nbperiext        */
 106        __le32 in_diskblock;    /* 4: for standalone test driver */
 107        __le32 in_maxag;        /* 4: for standalone test driver */
 108        u8 pad[2016];           /* 2016: pad to 2048            */
 109        struct iagctl_disk in_agctl[MAXAG]; /* 2048: AG control information */
 110};                              /* (4096) */
 111
 112struct dinomap {
 113        int in_freeiag;         /* free iag list anchor         */
 114        int in_nextiag;         /* next free iag number         */
 115        int in_numinos;         /* num of backed inodes         */
 116        int in_numfree;         /* num of free backed inodes    */
 117        int in_nbperiext;       /* num of blocks per inode extent */
 118        int in_l2nbperiext;     /* l2 of in_nbperiext           */
 119        int in_diskblock;       /* for standalone test driver   */
 120        int in_maxag;           /* for standalone test driver   */
 121        struct iagctl in_agctl[MAXAG];  /* AG control information */
 122};
 123
 124/*
 125 *      In-core inode map control page
 126 */
 127struct inomap {
 128        struct dinomap im_imap;         /* 4096: inode allocation control */
 129        struct inode *im_ipimap;        /* 4: ptr to inode for imap     */
 130        struct mutex im_freelock;       /* 4: iag free list lock        */
 131        struct mutex im_aglock[MAXAG];  /* 512: per AG locks            */
 132        u32 *im_DBGdimap;
 133        atomic_t im_numinos;    /* num of backed inodes */
 134        atomic_t im_numfree;    /* num of free backed inodes */
 135};
 136
 137#define im_freeiag      im_imap.in_freeiag
 138#define im_nextiag      im_imap.in_nextiag
 139#define im_agctl        im_imap.in_agctl
 140#define im_nbperiext    im_imap.in_nbperiext
 141#define im_l2nbperiext  im_imap.in_l2nbperiext
 142
 143/* for standalone testdriver
 144 */
 145#define im_diskblock    im_imap.in_diskblock
 146#define im_maxag        im_imap.in_maxag
 147
 148extern int diFree(struct inode *);
 149extern int diAlloc(struct inode *, bool, struct inode *);
 150extern int diSync(struct inode *);
 151/* external references */
 152extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
 153                        bool is_free, struct tblock * tblk);
 154extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
 155extern int diMount(struct inode *);
 156extern int diUnmount(struct inode *, int);
 157extern int diRead(struct inode *);
 158extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
 159extern void diWriteSpecial(struct inode *, int);
 160extern void diFreeSpecial(struct inode *);
 161extern int diWrite(tid_t tid, struct inode *);
 162#endif                          /* _H_JFS_IMAP */
 163