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 */ 62 struct iag { 63 s64 agstart; /* 8: starting block of ag */ 64 s32 iagnum; /* 4: inode allocation group number */ 65 s32 inofreefwd; /* 4: ag inode free list forward */ 66 s32 inofreeback; /* 4: ag inode free list back */ 67 s32 extfreefwd; /* 4: ag inode extent free list forward */ 68 s32 extfreeback; /* 4: ag inode extent free list back */ 69 s32 iagfree; /* 4: iag free list */ 70 71 /* summary map: 1 bit per inode extent */ 72 s32 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 s32 extsmap[SMAPSZ]; /* 16: sum map of mapwords w/ free extents */ 82 s32 nfreeinos; /* 4: number of free inodes */ 83 s32 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 u32 wmap[EXTSPERIAG]; /* 512: working allocation map */ 88 u32 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 */ 95 struct iagctl { 96 s32 inofree; /* 4: free inode list anchor */ 97 s32 extfree; /* 4: free extent list anchor */ 98 s32 numinos; /* 4: number of backed inodes */ 99 s32 numfree; /* 4: number of free inodes */ 100 }; /* (16) */ 101 102 /* 103 * per fileset/aggregate inode map control page 104 */ 105 struct dinomap { 106 s32 in_freeiag; /* 4: free iag list anchor */ 107 s32 in_nextiag; /* 4: next free iag number */ 108 s32 in_numinos; /* 4: num of backed inodes */ 109 s32 in_numfree; /* 4: num of free backed inodes */ 110 s32 in_nbperiext; /* 4: num of blocks per inode extent */ 111 s32 in_l2nbperiext; /* 4: l2 of in_nbperiext */ 112 s32 in_diskblock; /* 4: for standalone test driver */ 113 s32 in_maxag; /* 4: for standalone test driver */ 114 u8 pad[2016]; /* 2016: pad to 2048 */ 115 struct iagctl in_agctl[MAXAG]; /* 2048: AG control information */ 116 }; /* (4096) */ 117 118 119 /* 120 * In-core inode map control page 121 */ 122 struct inomap { 123 struct dinomap im_imap; /* 4096: inode allocation control */ 124 struct inode *im_ipimap; /* 4: ptr to inode for imap */ 125 struct semaphore im_freelock; /* 4: iag free list lock */ 126 struct semaphore im_aglock[MAXAG]; /* 512: per AG locks */ 127 u32 *im_DBGdimap; 128 atomic_t im_numinos; /* num of backed inodes */ 129 atomic_t im_numfree; /* num of free backed inodes */ 130 }; 131 132 #define im_freeiag im_imap.in_freeiag 133 #define im_nextiag im_imap.in_nextiag 134 #define im_agctl im_imap.in_agctl 135 #define im_nbperiext im_imap.in_nbperiext 136 #define im_l2nbperiext im_imap.in_l2nbperiext 137 138 /* for standalone testdriver 139 */ 140 #define im_diskblock im_imap.in_diskblock 141 #define im_maxag im_imap.in_maxag 142 143 extern int diFree(struct inode *); 144 extern int diAlloc(struct inode *, boolean_t, struct inode *); 145 extern int diSync(struct inode *); 146 /* external references */ 147 extern int diUpdatePMap(struct inode *ipimap, unsigned long inum, 148 boolean_t is_free, struct tblock * tblk); 149 extern int diExtendFS(struct inode *ipimap, struct inode *ipbmap); 150 extern int diMount(struct inode *); 151 extern int diUnmount(struct inode *, int); 152 extern int diRead(struct inode *); 153 extern struct inode *diReadSpecial(struct super_block *, ino_t, int); 154 extern void diWriteSpecial(struct inode *, int); 155 extern void diFreeSpecial(struct inode *); 156 extern int diWrite(tid_t tid, struct inode *); 157 #endif /* _H_JFS_IMAP */ 158