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