1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)lfs.h 7.14 (Berkeley) 06/23/92 8 */ 9 10 #define LFS_LABELPAD 8192 /* LFS label size */ 11 #define LFS_SBPAD 8192 /* LFS superblock size */ 12 #define MAXMNTLEN 512 /* XXX move from fs.h to mount.h */ 13 14 /* On-disk and in-memory checkpoint segment usage structure. */ 15 typedef struct segusage SEGUSE; 16 struct segusage { 17 u_long su_nbytes; /* number of live bytes */ 18 u_long su_lastmod; /* SEGUSE last modified timestamp */ 19 #define SEGUSE_ACTIVE 0x1 /* segment is currently being written */ 20 #define SEGUSE_DIRTY 0x2 /* segment has data in it */ 21 #define SEGUSE_SUPERBLOCK 0x4 /* segment contains a superblock */ 22 #define SEGUSE_LIVELOG 0x8 /* segment has not been checkpointed */ 23 u_long su_flags; 24 }; 25 26 #define SEGTABSIZE_SU(fs) \ 27 (((fs)->lfs_nseg * sizeof(SEGUSE) + \ 28 ((fs)->lfs_bsize - 1)) >> (fs)->lfs_bshift) 29 30 /* On-disk file information. One per file with data blocks in the segment. */ 31 typedef struct finfo FINFO; 32 struct finfo { 33 u_long fi_nblocks; /* number of blocks */ 34 u_long fi_version; /* version number */ 35 u_long fi_ino; /* inode number */ 36 long fi_blocks[1]; /* array of logical block numbers */ 37 }; 38 39 /* On-disk and in-memory super block. */ 40 struct lfs { 41 #define LFS_MAGIC 0x070162 42 u_long lfs_magic; /* magic number */ 43 #define LFS_VERSION 1 44 u_long lfs_version; /* version number */ 45 46 u_long lfs_size; /* number of blocks in fs */ 47 u_long lfs_ssize; /* number of blocks per segment */ 48 u_long lfs_dsize; /* number of data blocks in fs */ 49 u_long lfs_bsize; /* size of basic blocks in fs */ 50 u_long lfs_fsize; /* size of frag blocks in fs */ 51 u_long lfs_frag; /* number of frags in a block in fs */ 52 53 /* Checkpoint region. */ 54 ino_t lfs_free; /* start of the free list */ 55 u_long lfs_bfree; /* number of free blocks */ 56 u_long lfs_nfiles; /* number of allocated inodes */ 57 daddr_t lfs_idaddr; /* inode file disk address */ 58 ino_t lfs_ifile; /* inode file inode number */ 59 daddr_t lfs_lastseg; /* address of last segment written */ 60 daddr_t lfs_nextseg; /* address of next segment to write */ 61 daddr_t lfs_curseg; /* current segment being written */ 62 daddr_t lfs_offset; /* offset in curseg for next partial */ 63 daddr_t lfs_lastpseg; /* address of last partial written */ 64 u_long lfs_tstamp; /* time stamp */ 65 66 /* These are configuration parameters. */ 67 u_long lfs_minfree; /* minimum percentage of free blocks */ 68 69 /* These fields can be computed from the others. */ 70 u_long lfs_dbpseg; /* disk blocks per segment */ 71 u_long lfs_inopb; /* inodes per block */ 72 u_long lfs_ifpb; /* IFILE entries per block */ 73 u_long lfs_sepb; /* SEGUSE entries per block */ 74 u_long lfs_nindir; /* indirect pointers per block */ 75 u_long lfs_nseg; /* number of segments */ 76 u_long lfs_nspf; /* number of sectors per fragment */ 77 u_long lfs_cleansz; /* cleaner info size in blocks */ 78 u_long lfs_segtabsz; /* segment table size in blocks */ 79 80 u_long lfs_segmask; /* calculate offset within a segment */ 81 u_long lfs_segshift; /* fast mult/div for segments */ 82 u_long lfs_bmask; /* calc block offset from file offset */ 83 u_long lfs_bshift; /* calc block number from file offset */ 84 u_long lfs_ffmask; /* calc frag offset from file offset */ 85 u_long lfs_ffshift; /* fast mult/div for frag from file */ 86 u_long lfs_fbmask; /* calc frag offset from block offset */ 87 u_long lfs_fbshift; /* fast mult/div for frag from block */ 88 u_long lfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 89 90 #define LFS_MIN_SBINTERVAL 5 /* minimum superblock segment spacing */ 91 #define LFS_MAXNUMSB 10 /* superblock disk offsets */ 92 daddr_t lfs_sboffs[LFS_MAXNUMSB]; 93 94 /* These fields are set at mount time and are meaningless on disk. */ 95 struct vnode *lfs_ivnode; /* vnode for the ifile */ 96 SEGUSE *lfs_segtab; /* in-memory segment usage table */ 97 /* XXX NOT USED */ 98 void *XXXlfs_seglist; /* list of segments being written */ 99 u_long lfs_iocount; /* number of ios pending */ 100 u_long lfs_writer; /* don't allow any dirops to start */ 101 u_long lfs_dirops; /* count of active directory ops */ 102 u_long lfs_doifile; /* Write ifile blocks on next write */ 103 u_char lfs_fmod; /* super block modified flag */ 104 u_char lfs_clean; /* file system is clean flag */ 105 u_char lfs_ronly; /* mounted read-only flag */ 106 u_char lfs_flags; /* currently unused flag */ 107 u_char lfs_fsmnt[MAXMNTLEN]; /* name mounted on */ 108 u_char pad[3]; /* long-align */ 109 110 /* Checksum; valid on disk. */ 111 u_long lfs_cksum; /* checksum for superblock checking */ 112 }; 113 114 /* 115 * Inode 0 is the out-of-band inode number, inode 1 is the inode number for 116 * the IFILE, the root inode is 2 and the lost+found inode is 3. 117 */ 118 119 /* Fixed inode numbers. */ 120 #define LFS_UNUSED_INUM 0 /* out of band inode number */ 121 #define LFS_IFILE_INUM 1 /* IFILE inode number */ 122 #define LOSTFOUNDINO 3 /* lost+found inode number */ 123 #define LFS_FIRST_INUM 4 /* first free inode number */ 124 125 /* 126 * Used to access the first spare of the dinode which we use to store 127 * the ifile number so we can identify them 128 */ 129 #define di_inum di_spare[0] 130 131 /* Address calculations for metadata located in the inode */ 132 #define S_INDIR(fs) -NDADDR 133 #define D_INDIR(fs) (S_INDIR(fs) - NINDIR(fs) - 1) 134 #define T_INDIR(fs) (D_INDIR(fs) - NINDIR(fs) * NINDIR(fs) - 1) 135 136 /* Structure used to pass around logical block paths. */ 137 typedef struct _indir { 138 long in_lbn; /* logical block number */ 139 int in_off; /* offset in buffer */ 140 } INDIR; 141 142 /* Unassigned disk address. */ 143 #define UNASSIGNED -1 144 145 typedef struct ifile IFILE; 146 struct ifile { 147 u_long if_version; /* inode version number */ 148 #define LFS_UNUSED_DADDR 0 /* out-of-band daddr */ 149 daddr_t if_daddr; /* inode disk address */ 150 ino_t if_nextfree; /* next-unallocated inode */ 151 }; 152 153 /* 154 * Cleaner information structure. This resides in the ifile and is used 155 * to pass information between the cleaner and the kernel. 156 */ 157 typedef struct _cleanerinfo { 158 u_long clean; /* K: number of clean segments */ 159 u_long dirty; /* K: number of dirty segments */ 160 } CLEANERINFO; 161 162 #define CLEANSIZE_SU(fs) \ 163 ((sizeof(CLEANERINFO) + (fs)->lfs_bsize - 1) >> (fs)->lfs_bshift) 164 165 /* 166 * All summary blocks are the same size, so we can always read a summary 167 * block easily from a segment. 168 */ 169 #define LFS_SUMMARY_SIZE 512 170 171 /* On-disk segment summary information */ 172 typedef struct segsum SEGSUM; 173 struct segsum { 174 u_long ss_sumsum; /* check sum of summary block */ 175 u_long ss_datasum; /* check sum of data */ 176 daddr_t ss_next; /* next segment */ 177 u_long ss_create; /* creation time stamp */ 178 u_short ss_nfinfo; /* number of file info structures */ 179 u_short ss_ninos; /* number of inodes in summary */ 180 #define SS_DIROP 0x01 /* segment begins a dirop */ 181 #define SS_CONT 0x02 /* more partials to finish this write*/ 182 u_short ss_flags; /* used for directory operations */ 183 u_short ss_pad; /* extra space */ 184 /* FINFO's and inode daddr's... */ 185 }; 186 187 /* NINDIR is the number of indirects in a file system block. */ 188 #define NINDIR(fs) ((fs)->lfs_nindir) 189 190 /* INOPB is the number of inodes in a secondary storage block. */ 191 #define INOPB(fs) ((fs)->lfs_inopb) 192 193 #define blksize(fs) ((fs)->lfs_bsize) 194 #define blkoff(fs, loc) ((loc) & (fs)->lfs_bmask) 195 #define fsbtodb(fs, b) ((b) << (fs)->lfs_fsbtodb) 196 #define lblkno(fs, loc) ((loc) >> (fs)->lfs_bshift) 197 #define lblktosize(fs, blk) ((blk) << (fs)->lfs_bshift) 198 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 199 ((loc) >> (fs)->lfs_bshift) 200 201 #define datosn(fs, daddr) /* disk address to segment number */ \ 202 (((daddr) - (fs)->lfs_sboffs[0]) / fsbtodb((fs), (fs)->lfs_ssize)) 203 #define sntoda(fs, sn) /* segment number to disk address */ \ 204 ((daddr_t)((sn) * ((fs)->lfs_ssize << (fs)->lfs_fsbtodb) + \ 205 (fs)->lfs_sboffs[0])) 206 207 /* Read in the block with the cleaner info from the ifile. */ 208 #define LFS_CLEANERINFO(CP, F, BP) { \ 209 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 210 if (bread((F)->lfs_ivnode, (daddr_t)0, (F)->lfs_bsize, NOCRED, &(BP))) \ 211 panic("lfs: ifile read"); \ 212 (CP) = (CLEANERINFO *)(BP)->b_un.b_addr; \ 213 } 214 215 /* Read in the block with a specific inode from the ifile. */ 216 #define LFS_IENTRY(IP, F, IN, BP) { \ 217 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 218 if (bread((F)->lfs_ivnode, \ 219 (IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz, \ 220 (F)->lfs_bsize, NOCRED, &(BP))) \ 221 panic("lfs: ifile read"); \ 222 (IP) = (IFILE *)(BP)->b_un.b_addr + (IN) % (F)->lfs_ifpb; \ 223 } 224 225 /* Read in the block with a specific segment usage entry from the ifile. */ 226 #define LFS_SEGENTRY(SP, F, IN, BP) { \ 227 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 228 if (bread((F)->lfs_ivnode, (IN) / (F)->lfs_sepb + (F)->lfs_cleansz, \ 229 (F)->lfs_bsize, NOCRED, &(BP))) \ 230 panic("lfs: ifile read"); \ 231 (SP) = (SEGUSE *)(BP)->b_un.b_addr + (IN) % (F)->lfs_sepb; \ 232 } 233 234 /* Write a block and update the inode change times. */ 235 #define LFS_UBWRITE(BP) { \ 236 USES_VOP_BWRITE; \ 237 VTOI((BP)->b_vp)->i_flag |= ICHG | IUPD; \ 238 VOP_BWRITE(BP); \ 239 } 240 241 /* 242 * Structures used by lfs_bmapv and lfs_markv to communicate information 243 * about inodes and data blocks. 244 */ 245 typedef struct block_info { 246 ino_t bi_inode; /* inode # */ 247 off_t bi_lbn; /* logical block w/in file */ 248 daddr_t bi_daddr; /* disk address of block */ 249 time_t bi_segcreate; /* origin segment create time */ 250 void *bi_bp; /* data buffer */ 251 } BLOCK_INFO; 252 253 typedef struct inode_info { 254 ino_t ii_inode; /* inode # */ 255 daddr_t ii_daddr; /* disk address of block */ 256 time_t ii_segcreate; /* origin segment create time */ 257 struct dinode *ii_dinode; /* data buffer */ 258 } INODE_INFO; 259