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 7.19 (Berkeley) 07/24/92 8 */ 9 10 #define LFS_LABELPAD 8192 /* LFS label size */ 11 #define LFS_SBPAD 8192 /* LFS superblock size */ 12 13 /* 14 * XXX 15 * This is a kluge and NEEDS to go away. 16 * 17 * Right now, ufs code handles most of the calls for directory operations 18 * such as create, mkdir, link, etc. As a result VOP_UPDATE is being 19 * called with waitfor set (since ffs does these things synchronously). 20 * Since LFS does not want to do these synchronously, we treat the last 21 * argument to lfs_update as a set of flags. If LFS_SYNC is set, then 22 * the update should be synchronous, if not, do it asynchronously. 23 * Unfortunately, this means that LFS won't work with NFS yet because 24 * NFS goes through paths that will make normal calls to ufs which will 25 * call lfs with a last argument of 1. 26 */ 27 #define LFS_SYNC 0x02 28 29 /* On-disk and in-memory checkpoint segment usage structure. */ 30 typedef struct segusage SEGUSE; 31 struct segusage { 32 u_long su_nbytes; /* number of live bytes */ 33 u_long su_lastmod; /* SEGUSE last modified timestamp */ 34 u_short su_nsums; /* number of summaries in segment */ 35 u_short su_ninos; /* number of inode blocks in seg */ 36 #define SEGUSE_ACTIVE 0x1 /* segment is currently being written */ 37 #define SEGUSE_DIRTY 0x2 /* segment has data in it */ 38 #define SEGUSE_SUPERBLOCK 0x4 /* segment contains a superblock */ 39 u_long su_flags; 40 }; 41 42 #define SEGUPB(fs) (1 << (fs)->lfs_sushift); 43 #define SEGTABSIZE_SU(fs) \ 44 ((fs)->lfs_nseg >> ((fs)->lfs_bshift - (fs)->lfs_sushift)) 45 46 /* On-disk file information. One per file with data blocks in the segment. */ 47 typedef struct finfo FINFO; 48 struct finfo { 49 u_long fi_nblocks; /* number of blocks */ 50 u_long fi_version; /* version number */ 51 u_long fi_ino; /* inode number */ 52 long fi_blocks[1]; /* array of logical block numbers */ 53 }; 54 55 /* On-disk and in-memory super block. */ 56 struct lfs { 57 #define LFS_MAGIC 0x070162 58 u_long lfs_magic; /* magic number */ 59 #define LFS_VERSION 1 60 u_long lfs_version; /* version number */ 61 62 u_long lfs_size; /* number of blocks in fs */ 63 u_long lfs_ssize; /* number of blocks per segment */ 64 u_long lfs_dsize; /* number of data blocks in fs */ 65 u_long lfs_bsize; /* size of basic blocks in fs */ 66 u_long lfs_fsize; /* size of frag blocks in fs */ 67 u_long lfs_frag; /* number of frags in a block in fs */ 68 69 /* Checkpoint region. */ 70 ino_t lfs_free; /* start of the free list */ 71 u_long lfs_bfree; /* number of free disk blocks */ 72 u_long lfs_nfiles; /* number of allocated inodes */ 73 daddr_t lfs_idaddr; /* inode file disk address */ 74 ino_t lfs_ifile; /* inode file inode number */ 75 daddr_t lfs_lastseg; /* address of last segment written */ 76 daddr_t lfs_nextseg; /* address of next segment to write */ 77 daddr_t lfs_curseg; /* current segment being written */ 78 daddr_t lfs_offset; /* offset in curseg for next partial */ 79 daddr_t lfs_lastpseg; /* address of last partial written */ 80 u_long lfs_tstamp; /* time stamp */ 81 82 /* These are configuration parameters. */ 83 u_long lfs_minfree; /* minimum percentage of free blocks */ 84 85 /* These fields can be computed from the others. */ 86 u_quad_t lfs_maxfilesize; /* maximum representable file size */ 87 u_long lfs_dbpseg; /* disk blocks per segment */ 88 u_long lfs_inopb; /* inodes per block */ 89 u_long lfs_ifpb; /* IFILE entries per block */ 90 u_long lfs_sepb; /* SEGUSE entries per block */ 91 u_long lfs_nindir; /* indirect pointers per block */ 92 u_long lfs_nseg; /* number of segments */ 93 u_long lfs_nspf; /* number of sectors per fragment */ 94 u_long lfs_cleansz; /* cleaner info size in blocks */ 95 u_long lfs_segtabsz; /* segment table size in blocks */ 96 97 u_long lfs_segmask; /* calculate offset within a segment */ 98 u_long lfs_segshift; /* fast mult/div for segments */ 99 u_long lfs_bmask; /* calc block offset from file offset */ 100 u_long lfs_bshift; /* calc block number from file offset */ 101 u_long lfs_ffmask; /* calc frag offset from file offset */ 102 u_long lfs_ffshift; /* fast mult/div for frag from file */ 103 u_long lfs_fbmask; /* calc frag offset from block offset */ 104 u_long lfs_fbshift; /* fast mult/div for frag from block */ 105 u_long lfs_fsbtodb; /* fsbtodb and dbtofsb shift constant */ 106 u_long lfs_sushift; /* fast mult/div for segusage table */ 107 108 #define LFS_MIN_SBINTERVAL 5 /* minimum superblock segment spacing */ 109 #define LFS_MAXNUMSB 10 /* superblock disk offsets */ 110 daddr_t lfs_sboffs[LFS_MAXNUMSB]; 111 112 /* These fields are set at mount time and are meaningless on disk. */ 113 struct vnode *lfs_ivnode; /* vnode for the ifile */ 114 u_long lfs_seglock; /* single-thread the segment writer */ 115 u_long lfs_iocount; /* number of ios pending */ 116 u_long lfs_writer; /* don't allow any dirops to start */ 117 u_long lfs_dirops; /* count of active directory ops */ 118 u_long lfs_doifile; /* Write ifile blocks on next write */ 119 u_char lfs_fmod; /* super block modified flag */ 120 u_char lfs_clean; /* file system is clean flag */ 121 u_char lfs_ronly; /* mounted read-only flag */ 122 u_char lfs_flags; /* currently unused flag */ 123 u_char lfs_fsmnt[MNAMELEN]; /* name mounted on */ 124 u_char pad[3]; /* long-align */ 125 126 /* Checksum; valid on disk. */ 127 u_long lfs_cksum; /* checksum for superblock checking */ 128 }; 129 130 /* 131 * Inode 0 is the out-of-band inode number, inode 1 is the inode number for 132 * the IFILE, the root inode is 2 and the lost+found inode is 3. 133 */ 134 135 /* Fixed inode numbers. */ 136 #define LFS_UNUSED_INUM 0 /* out of band inode number */ 137 #define LFS_IFILE_INUM 1 /* IFILE inode number */ 138 #define LOSTFOUNDINO 3 /* lost+found inode number */ 139 #define LFS_FIRST_INUM 4 /* first free inode number */ 140 141 /* 142 * Used to access the first spare of the dinode which we use to store 143 * the ifile number so we can identify them 144 */ 145 #define di_inum di_spare[0] 146 147 /* Address calculations for metadata located in the inode */ 148 #define S_INDIR(fs) -NDADDR 149 #define D_INDIR(fs) (S_INDIR(fs) - NINDIR(fs) - 1) 150 #define T_INDIR(fs) (D_INDIR(fs) - NINDIR(fs) * NINDIR(fs) - 1) 151 152 /* Structure used to pass around logical block paths. */ 153 typedef struct _indir { 154 long in_lbn; /* logical block number */ 155 int in_off; /* offset in buffer */ 156 } INDIR; 157 158 /* Unassigned disk address. */ 159 #define UNASSIGNED -1 160 161 typedef struct ifile IFILE; 162 struct ifile { 163 u_long if_version; /* inode version number */ 164 #define LFS_UNUSED_DADDR 0 /* out-of-band daddr */ 165 daddr_t if_daddr; /* inode disk address */ 166 ino_t if_nextfree; /* next-unallocated inode */ 167 }; 168 169 /* 170 * Cleaner information structure. This resides in the ifile and is used 171 * to pass information between the cleaner and the kernel. 172 */ 173 typedef struct _cleanerinfo { 174 u_long clean; /* K: number of clean segments */ 175 u_long dirty; /* K: number of dirty segments */ 176 } CLEANERINFO; 177 178 #define CLEANSIZE_SU(fs) \ 179 ((sizeof(CLEANERINFO) + (fs)->lfs_bsize - 1) >> (fs)->lfs_bshift) 180 181 /* 182 * All summary blocks are the same size, so we can always read a summary 183 * block easily from a segment. 184 */ 185 #define LFS_SUMMARY_SIZE 512 186 187 /* On-disk segment summary information */ 188 typedef struct segsum SEGSUM; 189 struct segsum { 190 u_long ss_sumsum; /* check sum of summary block */ 191 u_long ss_datasum; /* check sum of data */ 192 daddr_t ss_next; /* next segment */ 193 u_long ss_create; /* creation time stamp */ 194 u_short ss_nfinfo; /* number of file info structures */ 195 u_short ss_ninos; /* number of inodes in summary */ 196 #define SS_DIROP 0x01 /* segment begins a dirop */ 197 #define SS_CONT 0x02 /* more partials to finish this write*/ 198 u_short ss_flags; /* used for directory operations */ 199 u_short ss_pad; /* extra space */ 200 /* FINFO's and inode daddr's... */ 201 }; 202 203 /* NINDIR is the number of indirects in a file system block. */ 204 #define NINDIR(fs) ((fs)->lfs_nindir) 205 206 /* INOPB is the number of inodes in a secondary storage block. */ 207 #define INOPB(fs) ((fs)->lfs_inopb) 208 209 #define blksize(fs) ((fs)->lfs_bsize) 210 #define blkoff(fs, loc) ((loc) & (fs)->lfs_bmask) 211 #define fsbtodb(fs, b) ((b) << (fs)->lfs_fsbtodb) 212 #define dbtofsb(fs, b) ((b) >> (fs)->lfs_fsbtodb) 213 #define lblkno(fs, loc) ((loc) >> (fs)->lfs_bshift) 214 #define lblktosize(fs, blk) ((blk) << (fs)->lfs_bshift) 215 #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \ 216 ((loc) >> (fs)->lfs_bshift) 217 218 #define datosn(fs, daddr) /* disk address to segment number */ \ 219 (((daddr) - (fs)->lfs_sboffs[0]) / fsbtodb((fs), (fs)->lfs_ssize)) 220 #define sntoda(fs, sn) /* segment number to disk address */ \ 221 ((daddr_t)((sn) * ((fs)->lfs_ssize << (fs)->lfs_fsbtodb) + \ 222 (fs)->lfs_sboffs[0])) 223 224 /* Read in the block with the cleaner info from the ifile. */ 225 #define LFS_CLEANERINFO(CP, F, BP) { \ 226 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 227 if (bread((F)->lfs_ivnode, (daddr_t)0, (F)->lfs_bsize, NOCRED, &(BP))) \ 228 panic("lfs: ifile read"); \ 229 (CP) = (CLEANERINFO *)(BP)->b_un.b_addr; \ 230 } 231 232 /* Read in the block with a specific inode from the ifile. */ 233 #define LFS_IENTRY(IP, F, IN, BP) { \ 234 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 235 if (bread((F)->lfs_ivnode, \ 236 (IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz, \ 237 (F)->lfs_bsize, NOCRED, &(BP))) \ 238 panic("lfs: ifile read"); \ 239 (IP) = (IFILE *)(BP)->b_un.b_addr + (IN) % (F)->lfs_ifpb; \ 240 } 241 242 /* Read in the block with a specific segment usage entry from the ifile. */ 243 #define LFS_SEGENTRY(SP, F, IN, BP) { \ 244 VTOI((F)->lfs_ivnode)->i_flag |= IACC; \ 245 if (bread((F)->lfs_ivnode, \ 246 ((IN) >> (F)->lfs_sushift) + (F)->lfs_cleansz, \ 247 (F)->lfs_bsize, NOCRED, &(BP))) \ 248 panic("lfs: ifile read"); \ 249 (SP) = (SEGUSE *)(BP)->b_un.b_addr + ((IN) & (F)->lfs_sepb - 1); \ 250 } 251 252 /* Write a block and update the inode change times. */ 253 #define LFS_UBWRITE(BP) { \ 254 VTOI((BP)->b_vp)->i_flag |= ICHG | IUPD; \ 255 VOP_BWRITE(BP); \ 256 } 257 258 /* 259 * Structures used by lfs_bmapv and lfs_markv to communicate information 260 * about inodes and data blocks. 261 */ 262 typedef struct block_info { 263 ino_t bi_inode; /* inode # */ 264 daddr_t bi_lbn; /* logical block w/in file */ 265 daddr_t bi_daddr; /* disk address of block */ 266 time_t bi_segcreate; /* origin segment create time */ 267 void *bi_bp; /* data buffer */ 268 } BLOCK_INFO; 269 270 typedef struct inode_info { 271 ino_t ii_inode; /* inode # */ 272 daddr_t ii_daddr; /* disk address of block */ 273 time_t ii_segcreate; /* origin segment create time */ 274 struct dinode *ii_dinode; /* data buffer */ 275 } INODE_INFO; 276