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