fs/jfs/jfs_imap.h

   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  */
  49 struct 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  */
  82 struct 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
  89 struct 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  */
  99 struct 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
 112 struct 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  */
 127 struct 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
 148 extern int diFree(struct inode *);
 149 extern int diAlloc(struct inode *, bool, struct inode *);
 150 extern int diSync(struct inode *);
 151 /* external references */
 152 extern int diUpdatePMap(struct inode *ipimap, unsigned long inum,
 153                         bool is_free, struct tblock * tblk);
 154 extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap);
 155 extern int diMount(struct inode *);
 156 extern int diUnmount(struct inode *, int);
 157 extern int diRead(struct inode *);
 158 extern struct inode *diReadSpecial(struct super_block *, ino_t, int);
 159 extern void diWriteSpecial(struct inode *, int);
 160 extern void diFreeSpecial(struct inode *);
 161 extern int diWrite(tid_t tid, struct inode *);
 162 #endif                          /* _H_JFS_IMAP */