lfs.h revision 1.28
1 /* $NetBSD: lfs.h,v 1.28 2000/07/04 22:30:37 perseant Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Konrad E. Schroder <perseant (at) hhhh.org>. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 /*- 39 * Copyright (c) 1991, 1993 40 * The Regents of the University of California. All rights reserved. 41 * 42 * Redistribution and use in source and binary forms, with or without 43 * modification, are permitted provided that the following conditions 44 * are met: 45 * 1. Redistributions of source code must retain the above copyright 46 * notice, this list of conditions and the following disclaimer. 47 * 2. Redistributions in binary form must reproduce the above copyright 48 * notice, this list of conditions and the following disclaimer in the 49 * documentation and/or other materials provided with the distribution. 50 * 3. All advertising materials mentioning features or use of this software 51 * must display the following acknowledgement: 52 * This product includes software developed by the University of 53 * California, Berkeley and its contributors. 54 * 4. Neither the name of the University nor the names of its contributors 55 * may be used to endorse or promote products derived from this software 56 * without specific prior written permission. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * @(#)lfs.h 8.9 (Berkeley) 5/8/95 71 */ 72 73 /* 74 * Compile-time options for LFS. 75 */ 76 #define LFS_EAGAIN_FAIL /* markv fail with EAGAIN if ino is locked */ 77 #define LFS_TRACK_IOS /* attempt to avoid cleaning segments not yet fully written to disk */ 78 #define LFS_CANNOT_ROLLFW /* No roll-forward agent exists */ 79 80 /* #define DEBUG_LFS */ /* Intensive debugging of LFS subsystem */ 81 82 /* #define LFS_ATIME_IFILE */ /* Store atime in Ifile, don't push */ 83 84 /* 85 * Parameters and generic definitions 86 */ 87 #define BW_CLEAN 1 88 #define MIN_FREE_SEGS 2 89 #define LFS_MAX_ACTIVE 10 90 #define LFS_MAXDIROP (desiredvnodes>>2) 91 92 /* For convenience */ 93 #define IN_ALLMOD (IN_MODIFIED|IN_ACCESS|IN_CHANGE|IN_UPDATE|IN_ACCESSED|IN_CLEANING) 94 95 #ifndef LFS_ATIME_IFILE 96 # define LFS_ITIMES(ip, acc, mod, cre) FFS_ITIMES((ip),(acc),(mod),(cre)) 97 #else 98 # define LFS_ITIMES(ip, acc, mod, cre) { \ 99 struct buf *ibp; \ 100 IFILE *ifp; \ 101 \ 102 if ((ip)->i_flag & IN_ACCESS) { \ 103 LFS_IENTRY(ifp, ip->i_lfs, ip->i_number, ibp); \ 104 ifp->if_atime = (mod); \ 105 VOP_BWRITE(bp); \ 106 (ip)->i_flag &= ~IN_ACCESS; \ 107 } \ 108 if ((ip)->i_flag & (IN_CHANGE | IN_UPDATE)) { \ 109 (ip)->i_flag |= IN_MODIFIED; \ 110 if ((ip)->i_flag & IN_UPDATE) { \ 111 (ip)->i_ffs_mtime = (mod)->tv_sec; \ 112 (ip)->i_ffs_mtimensec = (mod)->tv_nsec; \ 113 (ip)->i_modrev++; \ 114 } \ 115 if ((ip)->i_flag & IN_CHANGE) { \ 116 (ip)->i_ffs_ctime = (cre)->tv_sec; \ 117 (ip)->i_ffs_ctimensec = (cre)->tv_nsec; \ 118 } \ 119 (ip)->i_flag &= ~(IN_CHANGE | IN_UPDATE); \ 120 } \ 121 } 122 #endif 123 124 #define WRITEINPROG(vp) (vp->v_dirtyblkhd.lh_first && !(VTOI(vp)->i_flag & (IN_MODIFIED|IN_ACCESSED|IN_CLEANING))) 125 126 /* Here begins the berkeley code */ 127 128 #define LFS_LABELPAD 8192 /* LFS label size */ 129 #define LFS_SBPAD 8192 /* LFS superblock size */ 130 131 /* On-disk and in-memory checkpoint segment usage structure. */ 132 typedef struct segusage SEGUSE; 133 struct segusage { 134 u_int32_t su_nbytes; /* number of live bytes */ 135 u_int32_t su_lastmod; /* SEGUSE last modified timestamp */ 136 u_int16_t su_nsums; /* number of summaries in segment */ 137 u_int16_t su_ninos; /* number of inode blocks in seg */ 138 139 #define SEGUSE_ACTIVE 0x01 /* segment is currently being written */ 140 #define SEGUSE_DIRTY 0x02 /* segment has data in it */ 141 #define SEGUSE_SUPERBLOCK 0x04 /* segment contains a superblock */ 142 u_int32_t su_flags; 143 }; 144 145 #define SEGUPB(fs) (1 << (fs)->lfs_sushift) 146 #define SEGTABSIZE_SU(fs) \ 147 (((fs)->lfs_nseg + SEGUPB(fs) - 1) >> (fs)->lfs_sushift) 148 149 /* On-disk file information. One per file with data blocks in the segment. */ 150 typedef struct finfo FINFO; 151 struct finfo { 152 u_int32_t fi_nblocks; /* number of blocks */ 153 u_int32_t fi_version; /* version number */ 154 u_int32_t fi_ino; /* inode number */ 155 u_int32_t fi_lastlength; /* length of last block in array */ 156 ufs_daddr_t fi_blocks[1]; /* array of logical block numbers */ 157 }; 158 159 /* On-disk super block. */ 160 struct dlfs { 161 #define LFS_MAGIC 0x070162 162 u_int32_t dlfs_magic; /* 0: magic number */ 163 #define LFS_VERSION 1 164 u_int32_t dlfs_version; /* 4: version number */ 165 166 u_int32_t dlfs_size; /* 8: number of blocks in fs */ 167 u_int32_t dlfs_ssize; /* 12: number of blocks per segment */ 168 u_int32_t dlfs_dsize; /* 16: number of disk blocks in fs */ 169 u_int32_t dlfs_bsize; /* 20: file system block size */ 170 u_int32_t dlfs_fsize; /* 24: size of frag blocks in fs */ 171 u_int32_t dlfs_frag; /* 28: number of frags in a block in fs */ 172 173 /* Checkpoint region. */ 174 u_int32_t dlfs_free; /* 32: start of the free list */ 175 u_int32_t dlfs_bfree; /* 36: number of free disk blocks */ 176 u_int32_t dlfs_nfiles; /* 40: number of allocated inodes */ 177 int32_t dlfs_avail; /* 44: blocks available for writing */ 178 u_int32_t dlfs_uinodes; /* 48: inodes in cache not yet on disk */ 179 ufs_daddr_t dlfs_idaddr; /* 52: inode file disk address */ 180 u_int32_t dlfs_ifile; /* 56: inode file inode number */ 181 ufs_daddr_t dlfs_lastseg; /* 60: address of last segment written */ 182 ufs_daddr_t dlfs_nextseg; /* 64: address of next segment to write */ 183 ufs_daddr_t dlfs_curseg; /* 68: current segment being written */ 184 ufs_daddr_t dlfs_offset; /* 72: offset in curseg for next partial */ 185 ufs_daddr_t dlfs_lastpseg; /* 76: address of last partial written */ 186 u_int32_t dlfs_tstamp; /* 80: time stamp */ 187 188 /* These are configuration parameters. */ 189 u_int32_t dlfs_minfree; /* 84: minimum percentage of free blocks */ 190 191 /* These fields can be computed from the others. */ 192 u_int64_t dlfs_maxfilesize; /* 88: maximum representable file size */ 193 u_int32_t dlfs_dbpseg; /* 96: disk blocks per segment */ 194 u_int32_t dlfs_inopb; /* 100: inodes per block */ 195 u_int32_t dlfs_ifpb; /* 104: IFILE entries per block */ 196 u_int32_t dlfs_sepb; /* 108: SEGUSE entries per block */ 197 u_int32_t dlfs_nindir; /* 112: indirect pointers per block */ 198 u_int32_t dlfs_nseg; /* 116: number of segments */ 199 u_int32_t dlfs_nspf; /* 120: number of sectors per fragment */ 200 u_int32_t dlfs_cleansz; /* 124: cleaner info size in blocks */ 201 u_int32_t dlfs_segtabsz; /* 128: segment table size in blocks */ 202 u_int32_t dlfs_segmask; /* 132: calculate offset within a segment */ 203 u_int32_t dlfs_segshift; /* 136: fast mult/div for segments */ 204 u_int32_t dlfs_bshift; /* 140: calc block number from file offset */ 205 u_int32_t dlfs_ffshift; /* 144: fast mult/div for frag from file */ 206 u_int32_t dlfs_fbshift; /* 148: fast mult/div for frag from block */ 207 u_int64_t dlfs_bmask; /* 152: calc block offset from file offset */ 208 u_int64_t dlfs_ffmask; /* 160: calc frag offset from file offset */ 209 u_int64_t dlfs_fbmask; /* 168: calc frag offset from block offset */ 210 u_int32_t dlfs_fsbtodb; /* 176: fsbtodb and dbtofsb shift constant */ 211 u_int32_t dlfs_sushift; /* 180: fast mult/div for segusage table */ 212 213 int32_t dlfs_maxsymlinklen; /* 184: max length of an internal symlink */ 214 215 #define LFS_MIN_SBINTERVAL 5 /* minimum superblock segment spacing */ 216 #define LFS_MAXNUMSB 10 /* 188: superblock disk offsets */ 217 ufs_daddr_t dlfs_sboffs[LFS_MAXNUMSB]; 218 219 u_int32_t dlfs_nclean; /* 228: Number of clean segments */ 220 u_char dlfs_fsmnt[MNAMELEN]; /* 232: name mounted on */ 221 /* XXX this is 2 bytes only to pad to a quad boundary */ 222 u_int16_t dlfs_clean; /* 322: file system is clean flag */ 223 u_int32_t dlfs_dmeta; /* 324: total number of dirty summaries */ 224 u_int32_t dlfs_minfreeseg; /* 328: segs reserved for cleaner */ 225 int8_t dlfs_pad[176]; /* 332: round to 512 bytes */ 226 /* Checksum -- last valid disk field. */ 227 u_int32_t dlfs_cksum; /* 508: checksum for superblock checking */ 228 }; 229 230 /* Maximum number of io's we can have pending at once */ 231 #define LFS_THROTTLE 16 /* XXX should be better paramtrized - ? */ 232 233 /* In-memory super block. */ 234 struct lfs { 235 struct dlfs lfs_dlfs; /* on-disk parameters */ 236 #define lfs_magic lfs_dlfs.dlfs_magic 237 #define lfs_version lfs_dlfs.dlfs_version 238 #define lfs_size lfs_dlfs.dlfs_size 239 #define lfs_ssize lfs_dlfs.dlfs_ssize 240 #define lfs_dsize lfs_dlfs.dlfs_dsize 241 #define lfs_bsize lfs_dlfs.dlfs_bsize 242 #define lfs_fsize lfs_dlfs.dlfs_fsize 243 #define lfs_frag lfs_dlfs.dlfs_frag 244 #define lfs_free lfs_dlfs.dlfs_free 245 #define lfs_bfree lfs_dlfs.dlfs_bfree 246 #define lfs_nfiles lfs_dlfs.dlfs_nfiles 247 #define lfs_avail lfs_dlfs.dlfs_avail 248 #define lfs_uinodes lfs_dlfs.dlfs_uinodes 249 #define lfs_idaddr lfs_dlfs.dlfs_idaddr 250 #define lfs_ifile lfs_dlfs.dlfs_ifile 251 #define lfs_lastseg lfs_dlfs.dlfs_lastseg 252 #define lfs_nextseg lfs_dlfs.dlfs_nextseg 253 #define lfs_curseg lfs_dlfs.dlfs_curseg 254 #define lfs_offset lfs_dlfs.dlfs_offset 255 #define lfs_lastpseg lfs_dlfs.dlfs_lastpseg 256 #define lfs_tstamp lfs_dlfs.dlfs_tstamp 257 #define lfs_minfree lfs_dlfs.dlfs_minfree 258 #define lfs_maxfilesize lfs_dlfs.dlfs_maxfilesize 259 #define lfs_dbpseg lfs_dlfs.dlfs_dbpseg 260 #define lfs_inopb lfs_dlfs.dlfs_inopb 261 #define lfs_ifpb lfs_dlfs.dlfs_ifpb 262 #define lfs_sepb lfs_dlfs.dlfs_sepb 263 #define lfs_nindir lfs_dlfs.dlfs_nindir 264 #define lfs_nseg lfs_dlfs.dlfs_nseg 265 #define lfs_nspf lfs_dlfs.dlfs_nspf 266 #define lfs_cleansz lfs_dlfs.dlfs_cleansz 267 #define lfs_segtabsz lfs_dlfs.dlfs_segtabsz 268 #define lfs_segmask lfs_dlfs.dlfs_segmask 269 #define lfs_segshift lfs_dlfs.dlfs_segshift 270 #define lfs_bmask lfs_dlfs.dlfs_bmask 271 #define lfs_bshift lfs_dlfs.dlfs_bshift 272 #define lfs_ffmask lfs_dlfs.dlfs_ffmask 273 #define lfs_ffshift lfs_dlfs.dlfs_ffshift 274 #define lfs_fbmask lfs_dlfs.dlfs_fbmask 275 #define lfs_fbshift lfs_dlfs.dlfs_fbshift 276 #define lfs_fsbtodb lfs_dlfs.dlfs_fsbtodb 277 #define lfs_sushift lfs_dlfs.dlfs_sushift 278 #define lfs_maxsymlinklen lfs_dlfs.dlfs_maxsymlinklen 279 #define lfs_sboffs lfs_dlfs.dlfs_sboffs 280 #define lfs_cksum lfs_dlfs.dlfs_cksum 281 #define lfs_clean lfs_dlfs.dlfs_clean 282 #define lfs_fsmnt lfs_dlfs.dlfs_fsmnt 283 #define lfs_nclean lfs_dlfs.dlfs_nclean 284 #define lfs_dmeta lfs_dlfs.dlfs_dmeta 285 #define lfs_minfreeseg lfs_dlfs.dlfs_minfreeseg 286 287 /* These fields are set at mount time and are meaningless on disk. */ 288 struct segment *lfs_sp; /* current segment being written */ 289 struct vnode *lfs_ivnode; /* vnode for the ifile */ 290 u_int32_t lfs_seglock; /* single-thread the segment writer */ 291 pid_t lfs_lockpid; /* pid of lock holder */ 292 u_int32_t lfs_iocount; /* number of ios pending */ 293 u_int32_t lfs_writer; /* don't allow any dirops to start */ 294 u_int32_t lfs_dirops; /* count of active directory ops */ 295 u_int32_t lfs_doifile; /* Write ifile blocks on next write */ 296 u_int32_t lfs_nactive; /* Number of segments since last ckp */ 297 int8_t lfs_fmod; /* super block modified flag */ 298 int8_t lfs_ronly; /* mounted read-only flag */ 299 #define LFS_NOTYET 0x01 300 int8_t lfs_flags; /* currently unused flag */ 301 u_int16_t lfs_activesb; /* toggle between superblocks */ 302 #ifdef LFS_TRACK_IOS 303 daddr_t lfs_pending[LFS_THROTTLE]; /* daddrs of pending writes */ 304 #endif /* LFS_TRACK_IOS */ 305 #ifdef LFS_CANNOT_ROLLFW 306 daddr_t lfs_sbactive; /* disk address of in-progress sb write */ 307 #endif 308 struct vnode *lfs_flushvp; /* vnode being flushed */ 309 struct vnode *lfs_unlockvp; /* being inactivated in lfs_segunlock */ 310 u_int32_t lfs_diropwait; /* # procs waiting on dirop flush */ 311 struct lock lfs_freelock; 312 pid_t lfs_rfpid; /* Process ID of roll-forward agent */ 313 int lfs_nadirop; /* number of active dirop nodes */ 314 }; 315 316 /* 317 * Inode 0: out-of-band inode number 318 * Inode 1: IFILE inode number 319 * Inode 2: root inode 320 * Inode 3: lost+found inode number 321 */ 322 #define LFS_UNUSED_INUM 0 /* out of band inode number */ 323 #define LFS_IFILE_INUM 1 /* IFILE inode number */ 324 #define LOSTFOUNDINO 3 /* lost+found inode number */ 325 #define LFS_FIRST_INUM 4 /* first free inode number */ 326 327 /* Address calculations for metadata located in the inode */ 328 #define S_INDIR(fs) -NDADDR 329 #define D_INDIR(fs) (S_INDIR(fs) - NINDIR(fs) - 1) 330 #define T_INDIR(fs) (D_INDIR(fs) - NINDIR(fs) * NINDIR(fs) - 1) 331 332 /* Unassigned disk addresses. */ 333 #define UNASSIGNED -1 334 #define UNWRITTEN -2 335 336 /* Unused logical block number */ 337 #define LFS_UNUSED_LBN -1 338 339 typedef struct ifile IFILE; 340 struct ifile { 341 u_int32_t if_version; /* inode version number */ 342 #define LFS_UNUSED_DADDR 0 /* out-of-band daddr */ 343 ufs_daddr_t if_daddr; /* inode disk address */ 344 ino_t if_nextfree; /* next-unallocated inode */ 345 #ifdef LFS_ATIME_IFILE 346 struct timespec if_atime; /* Last access time */ 347 #endif 348 }; 349 350 /* 351 * Cleaner information structure. This resides in the ifile and is used 352 * to pass information between the cleaner and the kernel. 353 */ 354 typedef struct _cleanerinfo { 355 u_int32_t clean; /* number of clean segments */ 356 u_int32_t dirty; /* number of dirty segments */ 357 u_int32_t bfree; /* disk blocks free */ 358 u_int32_t avail; /* disk blocks available */ 359 } CLEANERINFO; 360 361 #define CLEANSIZE_SU(fs) \ 362 ((sizeof(CLEANERINFO) + (fs)->lfs_bsize - 1) >> (fs)->lfs_bshift) 363 364 /* 365 * All summary blocks are the same size, so we can always read a summary 366 * block easily from a segment. 367 */ 368 #define LFS_SUMMARY_SIZE 512 369 370 /* On-disk segment summary information */ 371 typedef struct segsum SEGSUM; 372 struct segsum { 373 u_int32_t ss_sumsum; /* check sum of summary block */ 374 u_int32_t ss_datasum; /* check sum of data */ 375 u_int32_t ss_magic; /* segment summary magic number */ 376 #define SS_MAGIC 0x061561 377 ufs_daddr_t ss_next; /* next segment */ 378 u_int32_t ss_create; /* creation time stamp */ 379 u_int16_t ss_nfinfo; /* number of file info structures */ 380 u_int16_t ss_ninos; /* number of inodes in summary */ 381 382 #define SS_DIROP 0x01 /* segment begins a dirop */ 383 #define SS_CONT 0x02 /* more partials to finish this write*/ 384 u_int16_t ss_flags; /* used for directory operations */ 385 u_int16_t ss_pad; /* extra space */ 386 /* FINFO's and inode daddr's... */ 387 }; 388 389 /* NINDIR is the number of indirects in a file system block. */ 390 #define NINDIR(fs) ((fs)->lfs_nindir) 391 392 /* INOPB is the number of inodes in a secondary storage block. */ 393 #define INOPB(fs) ((fs)->lfs_inopb) 394 395 #define blksize(fs, ip, lbn) \ 396 (((lbn) >= NDADDR || (ip)->i_ffs_size >= ((lbn) + 1) << (fs)->lfs_bshift) \ 397 ? (fs)->lfs_bsize \ 398 : (fragroundup(fs, blkoff(fs, (ip)->i_ffs_size)))) 399 #define blkoff(fs, loc) ((int)(loc) & (fs)->lfs_bmask) 400 #define fragoff(fs, loc) /* calculates (loc % fs->lfs_fsize) */ \ 401 ((int)((loc) & (fs)->lfs_ffmask)) 402 #define fsbtodb(fs, b) ((b) << (fs)->lfs_fsbtodb) 403 #define dbtofsb(fs, b) ((b) >> (fs)->lfs_fsbtodb) 404 #define fragstodb(fs, b) ((b) << ((fs)->lfs_fsbtodb - (fs)->lfs_fbshift)) 405 #define dbtofrags(fs, b) ((b) >> ((fs)->lfs_fsbtodb - (fs)->lfs_fbshift)) 406 #define lblkno(fs, loc) ((loc) >> (fs)->lfs_bshift) 407 #define lblktosize(fs, blk) ((blk) << (fs)->lfs_bshift) 408 #define numfrags(fs, loc) /* calculates (loc / fs->lfs_fsize) */ \ 409 ((loc) >> (fs)->lfs_ffshift) 410 #define blkroundup(fs, size) /* calculates roundup(size, fs->lfs_bsize) */ \ 411 ((int)(((size) + (fs)->lfs_bmask) & (~(fs)->lfs_bmask))) 412 #define fragroundup(fs, size) /* calculates roundup(size, fs->lfs_fsize) */ \ 413 ((int)(((size) + (fs)->lfs_ffmask) & (~(fs)->lfs_ffmask))) 414 #define fragstoblks(fs, frags) /* calculates (frags / fs->lfs_frag) */ \ 415 ((frags) >> (fs)->lfs_fbshift) 416 #define blkstofrags(fs, blks) /* calculates (blks * fs->lfs_frag) */ \ 417 ((blks) << (fs)->lfs_fbshift) 418 #define fragnum(fs, fsb) /* calculates (fsb % fs->lfs_frag) */ \ 419 ((fsb) & ((fs)->lfs_frag - 1)) 420 #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->lfs_frag) */ \ 421 ((fsb) &~ ((fs)->lfs_frag - 1)) 422 #define dblksize(fs, dip, lbn) \ 423 (((lbn) >= NDADDR || (dip)->di_size >= ((lbn) + 1) << (fs)->lfs_bshift)\ 424 ? (fs)->lfs_bsize \ 425 : (fragroundup(fs, blkoff(fs, (dip)->di_size)))) 426 #define datosn(fs, daddr) /* disk address to segment number */ \ 427 (((daddr) - (fs)->lfs_sboffs[0]) / fsbtodb((fs), (fs)->lfs_ssize)) 428 #define sntoda(fs, sn) /* segment number to disk address */ \ 429 ((ufs_daddr_t)((sn) * ((fs)->lfs_ssize << (fs)->lfs_fsbtodb) + \ 430 (fs)->lfs_sboffs[0])) 431 432 /* Read in the block with the cleaner info from the ifile. */ 433 #define LFS_CLEANERINFO(CP, F, BP) { \ 434 VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \ 435 if (bread((F)->lfs_ivnode, \ 436 (ufs_daddr_t)0, (F)->lfs_bsize, NOCRED, &(BP))) \ 437 panic("lfs: ifile read"); \ 438 (CP) = (CLEANERINFO *)(BP)->b_data; \ 439 } 440 441 /* Read in the block with a specific inode from the ifile. */ 442 #define LFS_IENTRY(IP, F, IN, BP) { \ 443 int _e; \ 444 VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \ 445 if ((_e = bread((F)->lfs_ivnode, \ 446 (IN) / (F)->lfs_ifpb + (F)->lfs_cleansz + (F)->lfs_segtabsz,\ 447 (F)->lfs_bsize, NOCRED, &(BP))) != 0) \ 448 panic("lfs: ifile read %d", _e); \ 449 (IP) = (IFILE *)(BP)->b_data + (IN) % (F)->lfs_ifpb; \ 450 } 451 452 /* Read in the block with a specific segment usage entry from the ifile. */ 453 #define LFS_SEGENTRY(SP, F, IN, BP) { \ 454 int _e; \ 455 VTOI((F)->lfs_ivnode)->i_flag |= IN_ACCESS; \ 456 if ((_e = bread((F)->lfs_ivnode, \ 457 ((IN) >> (F)->lfs_sushift) + (F)->lfs_cleansz, \ 458 (F)->lfs_bsize, NOCRED, &(BP))) != 0) \ 459 panic("lfs: ifile read: %d", _e); \ 460 (SP) = (SEGUSE *)(BP)->b_data + ((IN) & ((F)->lfs_sepb - 1)); \ 461 } 462 463 /* Determine if a buffer belongs to the ifile */ 464 #define IS_IFILE(bp) (VTOI(bp->b_vp)->i_number == LFS_IFILE_INUM) 465 466 /* 467 * Structures used by lfs_bmapv and lfs_markv to communicate information 468 * about inodes and data blocks. 469 */ 470 typedef struct block_info { 471 ino_t bi_inode; /* inode # */ 472 ufs_daddr_t bi_lbn; /* logical block w/in file */ 473 ufs_daddr_t bi_daddr; /* disk address of block */ 474 time_t bi_segcreate; /* origin segment create time */ 475 int bi_version; /* file version number */ 476 void *bi_bp; /* data buffer */ 477 int bi_size; /* size of the block (if fragment) */ 478 } BLOCK_INFO; 479 480 /* In-memory description of a segment about to be written. */ 481 struct segment { 482 struct lfs *fs; /* file system pointer */ 483 struct buf **bpp; /* pointer to buffer array */ 484 struct buf **cbpp; /* pointer to next available bp */ 485 struct buf **start_bpp; /* pointer to first bp in this set */ 486 struct buf *ibp; /* buffer pointer to inode page */ 487 struct dinode *idp; /* pointer to ifile dinode */ 488 struct finfo *fip; /* current fileinfo pointer */ 489 struct vnode *vp; /* vnode being gathered */ 490 void *segsum; /* segment summary info */ 491 u_int32_t ninodes; /* number of inodes in this segment */ 492 u_int32_t seg_bytes_left; /* bytes left in segment */ 493 u_int32_t sum_bytes_left; /* bytes left in summary block */ 494 u_int32_t seg_number; /* number of this segment */ 495 ufs_daddr_t *start_lbp; /* beginning lbn for this set */ 496 497 #define SEGM_CKP 0x01 /* doing a checkpoint */ 498 #define SEGM_CLEAN 0x02 /* cleaner call; don't sort */ 499 #define SEGM_SYNC 0x04 /* wait for segment */ 500 #define SEGM_PROT 0x08 /* don't inactivate at segunlock */ 501 u_int16_t seg_flags; /* run-time flags for this segment */ 502 }; 503 504 /* 505 * Macros for determining free space on the disk, with the variable metadata 506 * of segment summaries and inode blocks taken into account. 507 */ 508 /* Estimate number of clean blocks not available for writing */ 509 #define LFS_EST_CMETA(F) ((((F)->lfs_dmeta * (u_int64_t)(F)->lfs_nclean) / \ 510 ((F)->lfs_nseg - (F)->lfs_nclean))) 511 512 /* Estimate total size of the disk not including metadata */ 513 #define LFS_EST_NONMETA(F) ((F)->lfs_dsize - (F)->lfs_dmeta - LFS_EST_CMETA(F)) 514 515 /* Estimate number of blocks actually available for writing */ 516 #define LFS_EST_BFREE(F) ((F)->lfs_bfree - LFS_EST_CMETA(F) - (F)->lfs_dmeta) 517 518 /* Amount of non-meta space not available to mortal man */ 519 #define LFS_EST_RSVD(F) ((LFS_EST_NONMETA(F) * (u_int64_t)(F)->lfs_minfree) / \ 520 100) 521 522 /* Can credential C write BB blocks */ 523 #define ISSPACE(F, BB, C) \ 524 ((((C) == NOCRED || (C)->cr_uid == 0) && \ 525 LFS_EST_BFREE(F) >= (BB)) || \ 526 ((C)->cr_uid != 0 && IS_FREESPACE(F, BB))) 527 528 /* Can an ordinary user write BB blocks */ 529 #define IS_FREESPACE(F, BB) \ 530 (LFS_EST_BFREE(F) >= (BB) + LFS_EST_RSVD(F)) 531 532 /* Statistics Counters */ 533 struct lfs_stats { 534 u_int segsused; 535 u_int psegwrites; 536 u_int psyncwrites; 537 u_int pcleanwrites; 538 u_int blocktot; 539 u_int cleanblocks; 540 u_int ncheckpoints; 541 u_int nwrites; 542 u_int nsync_writes; 543 u_int wait_exceeded; 544 u_int write_exceeded; 545 u_int flush_invoked; 546 u_int vflush_invoked; 547 }; 548 extern struct lfs_stats lfs_stats; 549
Indexes created Tue Sep 30 20:09:53 GMT 2025