1/* $NetBSD: fs.h,v 1.66 2015/02/14 09:06:11 maxv Exp $ */
2
3/*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)fs.h 8.13 (Berkeley) 3/21/95
32 */
33
34/*
35 * NOTE: COORDINATE ON-DISK FORMAT CHANGES WITH THE FREEBSD PROJECT.
36 */
37
38#ifndef _UFS_FFS_FS_H_
39#define _UFS_FFS_FS_H_
40
41/*
42 * Each disk drive contains some number of file systems.
43 * A file system consists of a number of cylinder groups.
44 * Each cylinder group has inodes and data.
45 *
46 * A file system is described by its super-block, which in turn
47 * describes the cylinder groups. The super-block is critical
48 * data and is replicated in each cylinder group to protect against
49 * catastrophic loss. This is done at `newfs' time and the critical
50 * super-block data does not change, so the copies need not be
51 * referenced further unless disaster strikes.
52 *
53 * For file system fs, the offsets of the various blocks of interest
54 * are given in the super block as:
55 * [fs->fs_sblkno] Super-block
56 * [fs->fs_cblkno] Cylinder group block
57 * [fs->fs_iblkno] Inode blocks
58 * [fs->fs_dblkno] Data blocks
59 * The beginning of cylinder group cg in fs, is given by
60 * the ``cgbase(fs, cg)'' macro.
61 *
62 * Depending on the architecture and the media, the superblock may
63 * reside in any one of four places. For tiny media where every block
64 * counts, it is placed at the very front of the partition. Historically,
65 * UFS1 placed it 8K from the front to leave room for the disk label and
66 * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
67 * room for the disk label and a bigger bootstrap, and for really piggy
68 * systems we check at 256K from the front if the first three fail. In
69 * all cases the size of the superblock will be SBLOCKSIZE. All values are
70 * given in byte-offset form, so they do not imply a sector size. The
71 * SBLOCKSEARCH specifies the order in which the locations should be searched.
72 *
73 * Unfortunately the UFS2/FFSv2 change was done without adequate consideration
74 * of backward compatibility. In particular 'newfs' for a FFSv2 partition
75 * must overwrite any old FFSv1 superblock at 8k, and preferably as many
76 * of the alternates as it can find - otherwise attempting to mount on a
77 * system that only supports FFSv1 is likely to succeed!.
78 * For a small FFSv1 filesystem, an old FFSv2 superblock can be left on
79 * the disk, and a system that tries to find an FFSv2 filesystem in preference
80 * to and FFSv1 one (as NetBSD does) can mount the old FFSv2 filesystem.
81 * As a added bonus, the 'first alternate' superblock of a FFSv1 filesystem
82 * with 64k blocks is at 64k - just where the code looks first when playing
83 * 'hunt the superblock'.
84 *
85 * The ffsv2 superblock layout (which might contain an ffsv1 filesystem)
86 * can be detected by checking for sb->fs_old_flags & FS_FLAGS_UPDATED.
87 * This is the default superblock type for NetBSD since ffsv2 support was added.
88 */
89#define BBSIZE 8192
90#define BBOFF ((off_t)(0))
91#define BBLOCK ((daddr_t)(0))
92
93#define SBLOCK_FLOPPY 0
94#define SBLOCK_UFS1 8192
95#define SBLOCK_UFS2 65536
96#define SBLOCK_PIGGY 262144
97#define SBLOCKSIZE 8192
98/*
99 * NB: Do not, under any circumstances, look for an ffsv1 filesystem at
100 * SBLOCK_UFS2. Doing so will find the wrong superblock for filesystems
101 * with a 64k block size.
102 */
103#define SBLOCKSEARCH \
104 { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
105
106/*
107 * Max number of fragments per block. This value is NOT tweakable.
108 */
109#define MAXFRAG 8
110
111
112
113/*
114 * Addresses stored in inodes are capable of addressing fragments
115 * of `blocks'. File system blocks of at most size MAXBSIZE can
116 * be optionally broken into 2, 4, or 8 pieces, each of which is
117 * addressable; these pieces may be DEV_BSIZE, or some multiple of
118 * a DEV_BSIZE unit.
119 *
120 * Large files consist of exclusively large data blocks. To avoid
121 * undue wasted disk space, the last data block of a small file may be
122 * allocated as only as many fragments of a large block as are
123 * necessary. The file system format retains only a single pointer
124 * to such a fragment, which is a piece of a single large block that
125 * has been divided. The size of such a fragment is determinable from
126 * information in the inode, using the ``ffs_blksize(fs, ip, lbn)'' macro.
127 *
128 * The file system records space availability at the fragment level;
129 * to determine block availability, aligned fragments are examined.
130 */
131
132/*
133 * MINBSIZE is the smallest allowable block size.
134 * In order to insure that it is possible to create files of size
135 * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
136 * MINBSIZE must be big enough to hold a cylinder group block,
137 * thus changes to (struct cg) must keep its size within MINBSIZE.
138 * Note that super blocks are always of size SBSIZE,
139 * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
140 */
141#define MINBSIZE 4096
142
143/*
144 * The path name on which the file system is mounted is maintained
145 * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
146 * the super block for this name.
147 */
148#define MAXMNTLEN 468
149
150/*
151 * The volume name for this filesystem is maintained in fs_volname.
152 * MAXVOLLEN defines the length of the buffer allocated.
153 * This space used to be part of of fs_fsmnt.
154 */
155#define MAXVOLLEN 32
156
157/*
158 * There is a 128-byte region in the superblock reserved for in-core
159 * pointers to summary information. Originally this included an array
160 * of pointers to blocks of struct csum; now there are just four
161 * pointers and the remaining space is padded with fs_ocsp[].
162 * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
163 * is taken away to point to a contiguous array of struct csum for
164 * all cylinder groups; a second (fs_maxcluster) points to an array
165 * of cluster sizes that is computed as cylinder groups are inspected;
166 * the third (fs_contigdirs) points to an array that tracks the
167 * creation of new directories; and the fourth (fs_active) is used
168 * by snapshots.
169 */
170#define NOCSPTRS ((128 / sizeof(void *)) - 4)
171
172/*
173 * A summary of contiguous blocks of various sizes is maintained
174 * in each cylinder group. Normally this is set by the initial
175 * value of fs_maxcontig. To conserve space, a maximum summary size
176 * is set by FS_MAXCONTIG.
177 */
178#define FS_MAXCONTIG 16
179
180/*
181 * The maximum number of snapshot nodes that can be associated
182 * with each filesystem. This limit affects only the number of
183 * snapshot files that can be recorded within the superblock so
184 * that they can be found when the filesystem is mounted. However,
185 * maintaining too many will slow the filesystem performance, so
186 * having this limit is a good idea.
187 */
188#define FSMAXSNAP 20
189
190/*
191 * Used to identify special blocks in snapshots:
192 *
193 * BLK_NOCOPY - A block that was unallocated at the time the snapshot
194 * was taken, hence does not need to be copied when written.
195 * BLK_SNAP - A block held by another snapshot that is not needed by this
196 * snapshot. When the other snapshot is freed, the BLK_SNAP entries
197 * are converted to BLK_NOCOPY. These are needed to allow fsck to
198 * identify blocks that are in use by other snapshots (which are
199 * expunged from this snapshot).
200 */
201#define BLK_NOCOPY ((daddr_t)(1))
202#define BLK_SNAP ((daddr_t)(2))
203
204/*
205 * MINFREE gives the minimum acceptable percentage of file system
206 * blocks which may be free. If the freelist drops below this level
207 * only the superuser may continue to allocate blocks. This may
208 * be set to 0 if no reserve of free blocks is deemed necessary,
209 * however throughput drops by fifty percent if the file system
210 * is run at between 95% and 100% full; thus the minimum default
211 * value of fs_minfree is 5%. However, to get good clustering
212 * performance, 10% is a better choice. This value is used only
213 * when creating a file system and can be overridden from the
214 * command line. By default we choose to optimize for time.
215 */
216#define MINFREE 5
217#define DEFAULTOPT FS_OPTTIME
218
219/*
220 * Grigoriy Orlov <gluk@ptci.ru> has done some extensive work to fine
221 * tune the layout preferences for directories within a filesystem.
222 * His algorithm can be tuned by adjusting the following parameters
223 * which tell the system the average file size and the average number
224 * of files per directory. These defaults are well selected for typical
225 * filesystems, but may need to be tuned for odd cases like filesystems
226 * being used for squid caches or news spools.
227 */
228#define AVFILESIZ 16384 /* expected average file size */
229#define AFPDIR 64 /* expected number of files per directory */
230
231/*
232 * Per cylinder group information; summarized in blocks allocated
233 * from first cylinder group data blocks. These blocks have to be
234 * read in from fs_csaddr (size fs_cssize) in addition to the
235 * super block.
236 */
237struct csum {
238 int32_t cs_ndir; /* number of directories */
239 int32_t cs_nbfree; /* number of free blocks */
240 int32_t cs_nifree; /* number of free inodes */
241 int32_t cs_nffree; /* number of free frags */
242};
243
244struct csum_total {
245 int64_t cs_ndir; /* number of directories */
246 int64_t cs_nbfree; /* number of free blocks */
247 int64_t cs_nifree; /* number of free inodes */
248 int64_t cs_nffree; /* number of free frags */
249 int64_t cs_spare[4]; /* future expansion */
250};
251
252
253/*
254 * Super block for an FFS file system in memory.
255 */
256struct fs {
257 int32_t fs_firstfield; /* historic file system linked list, */
258 int32_t fs_unused_1; /* used for incore super blocks */
259 int32_t fs_sblkno; /* addr of super-block in filesys */
260 int32_t fs_cblkno; /* offset of cyl-block in filesys */
261 int32_t fs_iblkno; /* offset of inode-blocks in filesys */
262 int32_t fs_dblkno; /* offset of first data after cg */
263 int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
264 int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
265 int32_t fs_old_time; /* last time written */
266 int32_t fs_old_size; /* number of blocks in fs */
267 int32_t fs_old_dsize; /* number of data blocks in fs */
268 int32_t fs_ncg; /* number of cylinder groups */
269 int32_t fs_bsize; /* size of basic blocks in fs */
270 int32_t fs_fsize; /* size of frag blocks in fs */
271 int32_t fs_frag; /* number of frags in a block in fs */
272/* these are configuration parameters */
273 int32_t fs_minfree; /* minimum percentage of free blocks */
274 int32_t fs_old_rotdelay; /* num of ms for optimal next block */
275 int32_t fs_old_rps; /* disk revolutions per second */
276/* these fields can be computed from the others */
277 int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
278 int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
279 int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
280 int32_t fs_fshift; /* ``numfrags'' calc number of frags */
281/* these are configuration parameters */
282 int32_t fs_maxcontig; /* max number of contiguous blks */
283 int32_t fs_maxbpg; /* max number of blks per cyl group */
284/* these fields can be computed from the others */
285 int32_t fs_fragshift; /* block to frag shift */
286 int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
287 int32_t fs_sbsize; /* actual size of super block */
288 int32_t fs_spare1[2]; /* old fs_csmask */
289 /* old fs_csshift */
290 int32_t fs_nindir; /* value of FFS_NINDIR */
291 int32_t fs_inopb; /* value of FFS_INOPB */
292 int32_t fs_old_nspf; /* value of NSPF */
293/* yet another configuration parameter */
294 int32_t fs_optim; /* optimization preference, see below */
295/* these fields are derived from the hardware */
296 int32_t fs_old_npsect; /* # sectors/track including spares */
297 int32_t fs_old_interleave; /* hardware sector interleave */
298 int32_t fs_old_trackskew; /* sector 0 skew, per track */
299/* fs_id takes the space of the unused fs_headswitch and fs_trkseek fields */
300 int32_t fs_id[2]; /* unique file system id */
301/* sizes determined by number of cylinder groups and their sizes */
302 int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */
303 int32_t fs_cssize; /* size of cyl grp summary area */
304 int32_t fs_cgsize; /* cylinder group size */
305/* these fields are derived from the hardware */
306 int32_t fs_spare2; /* old fs_ntrak */
307 int32_t fs_old_nsect; /* sectors per track */
308 int32_t fs_old_spc; /* sectors per cylinder */
309 int32_t fs_old_ncyl; /* cylinders in file system */
310 int32_t fs_old_cpg; /* cylinders per group */
311 int32_t fs_ipg; /* inodes per group */
312 int32_t fs_fpg; /* blocks per group * fs_frag */
313/* this data must be re-computed after crashes */
314 struct csum fs_old_cstotal; /* cylinder summary information */
315/* these fields are cleared at mount time */
316 int8_t fs_fmod; /* super block modified flag */
317 uint8_t fs_clean; /* file system is clean flag */
318 int8_t fs_ronly; /* mounted read-only flag */
319 uint8_t fs_old_flags; /* see FS_ flags below */
320 u_char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
321 u_char fs_volname[MAXVOLLEN]; /* volume name */
322 uint64_t fs_swuid; /* system-wide uid */
323 int32_t fs_pad;
324/* these fields retain the current block allocation info */
325 int32_t fs_cgrotor; /* last cg searched (UNUSED) */
326 void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
327 u_int8_t *fs_contigdirs; /* # of contiguously allocated dirs */
328 struct csum *fs_csp; /* cg summary info buffer for fs_cs */
329 int32_t *fs_maxcluster; /* max cluster in each cyl group */
330 u_char *fs_active; /* used by snapshots to track fs */
331 int32_t fs_old_cpc; /* cyl per cycle in postbl */
332/* this area is otherwise allocated unless fs_old_flags & FS_FLAGS_UPDATED */
333 int32_t fs_maxbsize; /* maximum blocking factor permitted */
334 uint8_t fs_journal_version; /* journal format version */
335 uint8_t fs_journal_location; /* journal location type */
336 uint8_t fs_journal_reserved[2];/* reserved for future use */
337 uint32_t fs_journal_flags; /* journal flags */
338 uint64_t fs_journallocs[4]; /* location info for journal */
339 uint32_t fs_quota_magic; /* see quota2.h */
340 uint8_t fs_quota_flags; /* see quota2.h */
341 uint8_t fs_quota_reserved[3];
342 uint64_t fs_quotafile[2]; /* pointer to quota inodes */
343 int64_t fs_sparecon64[9]; /* reserved for future use */
344 int64_t fs_sblockloc; /* byte offset of standard superblock */
345 struct csum_total fs_cstotal; /* cylinder summary information */
346 int64_t fs_time; /* last time written */
347 int64_t fs_size; /* number of blocks in fs */
348 int64_t fs_dsize; /* number of data blocks in fs */
349 int64_t fs_csaddr; /* blk addr of cyl grp summary area */
350 int64_t fs_pendingblocks; /* blocks in process of being freed */
351 int32_t fs_pendinginodes; /* inodes in process of being freed */
352 int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
353/* back to stuff that has been around a while */
354 int32_t fs_avgfilesize; /* expected average file size */
355 int32_t fs_avgfpdir; /* expected # of files per directory */
356 int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
357 int32_t fs_sparecon32[26]; /* reserved for future constants */
358 uint32_t fs_flags; /* see FS_ flags below */
359/* back to stuff that has been around a while (again) */
360 int32_t fs_contigsumsize; /* size of cluster summary array */
361 int32_t fs_maxsymlinklen; /* max length of an internal symlink */
362 int32_t fs_old_inodefmt; /* format of on-disk inodes */
363 u_int64_t fs_maxfilesize; /* maximum representable file size */
364 int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
365 int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
366 int32_t fs_state; /* validate fs_clean field (UNUSED) */
367 int32_t fs_old_postblformat; /* format of positional layout tables */
368 int32_t fs_old_nrpos; /* number of rotational positions */
369 int32_t fs_spare5[2]; /* old fs_postbloff */
370 /* old fs_rotbloff */
371 int32_t fs_magic; /* magic number */
372};
373
374#define fs_old_postbloff fs_spare5[0]
375#define fs_old_rotbloff fs_spare5[1]
376#define fs_old_postbl_start fs_maxbsize
377#define fs_old_headswitch fs_id[0]
378#define fs_old_trkseek fs_id[1]
379#define fs_old_csmask fs_spare1[0]
380#define fs_old_csshift fs_spare1[1]
381
382#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
383#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
384
385#define old_fs_postbl(fs_, cylno, opostblsave) \
386 ((((fs_)->fs_old_postblformat == FS_42POSTBLFMT) || \
387 ((fs_)->fs_old_postbloff == offsetof(struct fs, fs_old_postbl_start))) \
388 ? ((int16_t *)(opostblsave) + (cylno) * (fs_)->fs_old_nrpos) \
389 : ((int16_t *)((uint8_t *)(fs_) + \
390 (fs_)->fs_old_postbloff) + (cylno) * (fs_)->fs_old_nrpos))
391#define old_fs_rotbl(fs) \
392 (((fs)->fs_old_postblformat == FS_42POSTBLFMT) \
393 ? ((uint8_t *)(&(fs)->fs_magic+1)) \
394 : ((uint8_t *)((uint8_t *)(fs) + (fs)->fs_old_rotbloff)))
395
396/*
397 * File system identification
398 */
399#define FS_UFS1_MAGIC 0x011954 /* UFS1 fast file system magic number */
400#define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast file system magic number */
401#define FS_UFS1_MAGIC_SWAPPED 0x54190100
402#define FS_UFS2_MAGIC_SWAPPED 0x19015419
403#define FS_OKAY 0x7c269d38 /* superblock checksum */
404#define FS_42INODEFMT -1 /* 4.2BSD inode format */
405#define FS_44INODEFMT 2 /* 4.4BSD inode format */
406
407/*
408 * File system clean flags
409 */
410#define FS_ISCLEAN 0x01
411#define FS_WASCLEAN 0x02
412
413/*
414 * Preference for optimization.
415 */
416#define FS_OPTTIME 0 /* minimize allocation time */
417#define FS_OPTSPACE 1 /* minimize disk fragmentation */
418
419/*
420 * File system flags
421 */
422#define FS_UNCLEAN 0x001 /* file system not clean at mount (unused) */
423#define FS_DOSOFTDEP 0x002 /* file system using soft dependencies */
424#define FS_NEEDSFSCK 0x004 /* needs sync fsck (FreeBSD compat, unused) */
425#define FS_SUJ 0x008 /* file system using journaled softupdates */
426#define FS_ACLS 0x010 /* file system has ACLs enabled */
427#define FS_MULTILABEL 0x020 /* file system is MAC multi-label */
428#define FS_GJOURNAL 0x40 /* gjournaled file system */
429#define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
430#define FS_DOWAPBL 0x100 /* Write ahead physical block logging */
431/* FS_NFS4ACLS 0x100 file system has NFSv4 ACLs enabled (FBSD) */
432#define FS_DOQUOTA2 0x200 /* in-filesystem quotas */
433/* FS_INDEXDIRS 0x200 kernel supports indexed directories (FBSD)*/
434#define FS_TRIM 0x400 /* discard deleted blocks in storage layer */
435
436/* File system flags that are ok for NetBSD if set in fs_flags */
437#define FS_KNOWN_FLAGS (FS_DOSOFTDEP | FS_DOWAPBL | FS_DOQUOTA2)
438
439/*
440 * File system internal flags, also in fs_flags.
441 * (Pick highest number to avoid conflicts with others)
442 */
443#define FS_SWAPPED 0x80000000 /* file system is endian swapped */
444#define FS_INTERNAL 0x80000000 /* mask for internal flags */
445
446/*
447 * Macros to access bits in the fs_active array.
448 */
449#define ACTIVECG_SET(fs, cg) \
450 do { \
451 if ((fs)->fs_active != NULL) \
452 setbit((fs)->fs_active, (cg)); \
453 } while (/*CONSTCOND*/ 0)
454#define ACTIVECG_CLR(fs, cg) \
455 do { \
456 if ((fs)->fs_active != NULL) \
457 clrbit((fs)->fs_active, (cg)); \
458 } while (/*CONSTCOND*/ 0)
459#define ACTIVECG_ISSET(fs, cg) \
460 ((fs)->fs_active != NULL && isset((fs)->fs_active, (cg)))
461
462/*
463 * The size of a cylinder group is calculated by CGSIZE. The maximum size
464 * is limited by the fact that cylinder groups are at most one block.
465 * Its size is derived from the size of the maps maintained in the
466 * cylinder group and the (struct cg) size.
467 */
468#define CGSIZE_IF(fs, ipg, fpg) \
469 /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
470 /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
471 /* old boff */ (fs)->fs_old_cpg * sizeof(u_int16_t) + \
472 /* inode map */ howmany((ipg), NBBY) + \
473 /* block map */ howmany((fpg), NBBY) +\
474 /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
475 /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
476 /* cluster map */ howmany(ffs_fragstoblks(fs, (fpg)), NBBY)))
477
478#define CGSIZE(fs) CGSIZE_IF((fs), (fs)->fs_ipg, (fs)->fs_fpg)
479
480/*
481 * The minimal number of cylinder groups that should be created.
482 */
483#define MINCYLGRPS 4
484
485
486/*
487 * Convert cylinder group to base address of its global summary info.
488 */
489#define fs_cs(fs, indx) fs_csp[indx]
490
491/*
492 * Cylinder group block for a file system.
493 */
494#define CG_MAGIC 0x090255
495struct cg {
496 int32_t cg_firstfield; /* historic cyl groups linked list */
497 int32_t cg_magic; /* magic number */
498 int32_t cg_old_time; /* time last written */
499 int32_t cg_cgx; /* we are the cgx'th cylinder group */
500 int16_t cg_old_ncyl; /* number of cyl's this cg */
501 int16_t cg_old_niblk; /* number of inode blocks this cg */
502 int32_t cg_ndblk; /* number of data blocks this cg */
503 struct csum cg_cs; /* cylinder summary information */
504 int32_t cg_rotor; /* position of last used block */
505 int32_t cg_frotor; /* position of last used frag */
506 int32_t cg_irotor; /* position of last used inode */
507 int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
508 int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
509 int32_t cg_old_boff; /* (u_int16) free block positions */
510 int32_t cg_iusedoff; /* (u_int8) used inode map */
511 int32_t cg_freeoff; /* (u_int8) free block map */
512 int32_t cg_nextfreeoff; /* (u_int8) next available space */
513 int32_t cg_clustersumoff; /* (u_int32) counts of avail clusters */
514 int32_t cg_clusteroff; /* (u_int8) free cluster map */
515 int32_t cg_nclusterblks; /* number of clusters this cg */
516 int32_t cg_niblk; /* number of inode blocks this cg */
517 int32_t cg_initediblk; /* last initialized inode */
518 int32_t cg_sparecon32[3]; /* reserved for future use */
519 int64_t cg_time; /* time last written */
520 int64_t cg_sparecon64[3]; /* reserved for future use */
521 u_int8_t cg_space[1]; /* space for cylinder group maps */
522/* actually longer */
523};
524
525/*
526 * The following structure is defined
527 * for compatibility with old file systems.
528 */
529struct ocg {
530 int32_t cg_firstfield; /* historic linked list of cyl groups */
531 int32_t cg_unused_1; /* used for incore cyl groups */
532 int32_t cg_time; /* time last written */
533 int32_t cg_cgx; /* we are the cgx'th cylinder group */
534 int16_t cg_ncyl; /* number of cyl's this cg */
535 int16_t cg_niblk; /* number of inode blocks this cg */
536 int32_t cg_ndblk; /* number of data blocks this cg */
537 struct csum cg_cs; /* cylinder summary information */
538 int32_t cg_rotor; /* position of last used block */
539 int32_t cg_frotor; /* position of last used frag */
540 int32_t cg_irotor; /* position of last used inode */
541 int32_t cg_frsum[8]; /* counts of available frags */
542 int32_t cg_btot[32]; /* block totals per cylinder */
543 int16_t cg_b[32][8]; /* positions of free blocks */
544 u_int8_t cg_iused[256]; /* used inode map */
545 int32_t cg_magic; /* magic number */
546 u_int8_t cg_free[1]; /* free block map */
547/* actually longer */
548};
549
550
551/*
552 * Macros for access to cylinder group array structures.
553 */
554#define old_cg_blktot_old(cgp, ns) \
555 (((struct ocg *)(cgp))->cg_btot)
556#define old_cg_blks_old(fs, cgp, cylno, ns) \
557 (((struct ocg *)(cgp))->cg_b[cylno])
558
559#define old_cg_blktot_new(cgp, ns) \
560 ((int32_t *)((u_int8_t *)(cgp) + \
561 ufs_rw32((cgp)->cg_old_btotoff, (ns))))
562#define old_cg_blks_new(fs, cgp, cylno, ns) \
563 ((int16_t *)((u_int8_t *)(cgp) + \
564 ufs_rw32((cgp)->cg_old_boff, (ns))) + (cylno) * (fs)->fs_old_nrpos)
565
566#define old_cg_blktot(cgp, ns) \
567 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
568 old_cg_blktot_old(cgp, ns) : old_cg_blktot_new(cgp, ns))
569#define old_cg_blks(fs, cgp, cylno, ns) \
570 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
571 old_cg_blks_old(fs, cgp, cylno, ns) : old_cg_blks_new(fs, cgp, cylno, ns))
572
573#define cg_inosused_new(cgp, ns) \
574 ((u_int8_t *)((u_int8_t *)(cgp) + \
575 ufs_rw32((cgp)->cg_iusedoff, (ns))))
576#define cg_blksfree_new(cgp, ns) \
577 ((u_int8_t *)((u_int8_t *)(cgp) + \
578 ufs_rw32((cgp)->cg_freeoff, (ns))))
579#define cg_chkmagic_new(cgp, ns) \
580 (ufs_rw32((cgp)->cg_magic, (ns)) == CG_MAGIC)
581
582#define cg_inosused_old(cgp, ns) \
583 (((struct ocg *)(cgp))->cg_iused)
584#define cg_blksfree_old(cgp, ns) \
585 (((struct ocg *)(cgp))->cg_free)
586#define cg_chkmagic_old(cgp, ns) \
587 (ufs_rw32(((struct ocg *)(cgp))->cg_magic, (ns)) == CG_MAGIC)
588
589#define cg_inosused(cgp, ns) \
590 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
591 cg_inosused_old(cgp, ns) : cg_inosused_new(cgp, ns))
592#define cg_blksfree(cgp, ns) \
593 ((ufs_rw32((cgp)->cg_magic, (ns)) != CG_MAGIC) ? \
594 cg_blksfree_old(cgp, ns) : cg_blksfree_new(cgp, ns))
595#define cg_chkmagic(cgp, ns) \
596 (cg_chkmagic_new(cgp, ns) || cg_chkmagic_old(cgp, ns))
597
598#define cg_clustersfree(cgp, ns) \
599 ((u_int8_t *)((u_int8_t *)(cgp) + \
600 ufs_rw32((cgp)->cg_clusteroff, (ns))))
601#define cg_clustersum(cgp, ns) \
602 ((int32_t *)((u_int8_t *)(cgp) + \
603 ufs_rw32((cgp)->cg_clustersumoff, (ns))))
604
605
606/*
607 * Turn file system block numbers into disk block addresses.
608 * This maps file system blocks to device size blocks.
609 */
610#if defined (_KERNEL)
611#define FFS_FSBTODB(fs, b) ((b) << ((fs)->fs_fshift - DEV_BSHIFT))
612#define FFS_DBTOFSB(fs, b) ((b) >> ((fs)->fs_fshift - DEV_BSHIFT))
613#else
614#define FFS_FSBTODB(fs, b) ((b) << (fs)->fs_fsbtodb)
615#define FFS_DBTOFSB(fs, b) ((b) >> (fs)->fs_fsbtodb)
616#endif
617
618/*
619 * Cylinder group macros to locate things in cylinder groups.
620 * They calc file system addresses of cylinder group data structures.
621 */
622#define cgbase(fs, c) (((daddr_t)(fs)->fs_fpg) * (c))
623#define cgstart_ufs1(fs, c) \
624 (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask)))
625#define cgstart_ufs2(fs, c) cgbase((fs), (c))
626#define cgstart(fs, c) ((fs)->fs_magic == FS_UFS2_MAGIC \
627 ? cgstart_ufs2((fs), (c)) : cgstart_ufs1((fs), (c)))
628#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
629#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
630#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
631#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
632
633/*
634 * Macros for handling inode numbers:
635 * inode number to file system block offset.
636 * inode number to cylinder group number.
637 * inode number to file system block address.
638 */
639#define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
640#define ino_to_fsba(fs, x) \
641 ((daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
642 (ffs_blkstofrags((fs), (((x) % (fs)->fs_ipg) / FFS_INOPB(fs))))))
643#define ino_to_fsbo(fs, x) ((x) % FFS_INOPB(fs))
644
645/*
646 * Give cylinder group number for a file system block.
647 * Give cylinder group block number for a file system block.
648 */
649#define dtog(fs, d) ((d) / (fs)->fs_fpg)
650#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
651
652/*
653 * Extract the bits for a block from a map.
654 * Compute the cylinder and rotational position of a cyl block addr.
655 */
656#define blkmap(fs, map, loc) \
657 (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
658#define old_cbtocylno(fs, bno) \
659 (FFS_FSBTODB(fs, bno) / (fs)->fs_old_spc)
660#define old_cbtorpos(fs, bno) \
661 ((fs)->fs_old_nrpos <= 1 ? 0 : \
662 (FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc / (fs)->fs_old_nsect * (fs)->fs_old_trackskew + \
663 FFS_FSBTODB(fs, bno) % (fs)->fs_old_spc % (fs)->fs_old_nsect * (fs)->fs_old_interleave) % \
664 (fs)->fs_old_nsect * (fs)->fs_old_nrpos / (fs)->fs_old_npsect)
665
666/*
667 * The following macros optimize certain frequently calculated
668 * quantities by using shifts and masks in place of divisions
669 * modulos and multiplications.
670 */
671#define ffs_blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
672 ((loc) & (fs)->fs_qbmask)
673#define ffs_fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
674 ((loc) & (fs)->fs_qfmask)
675#define ffs_lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \
676 (((off_t)(frag)) << (fs)->fs_fshift)
677#define ffs_lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
678 ((uint64_t)(((off_t)(blk)) << (fs)->fs_bshift))
679#define ffs_lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
680 ((loc) >> (fs)->fs_bshift)
681#define ffs_numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
682 ((loc) >> (fs)->fs_fshift)
683#define ffs_blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
684 (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
685#define ffs_fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
686 (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
687#define ffs_fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
688 ((frags) >> (fs)->fs_fragshift)
689#define ffs_blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
690 ((blks) << (fs)->fs_fragshift)
691#define ffs_fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
692 ((fsb) & ((fs)->fs_frag - 1))
693#define ffs_blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
694 ((fsb) &~ ((fs)->fs_frag - 1))
695
696/*
697 * Determine the number of available frags given a
698 * percentage to hold in reserve.
699 */
700#define freespace(fs, percentreserved) \
701 (ffs_blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
702 (fs)->fs_cstotal.cs_nffree - \
703 (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
704
705/*
706 * Determining the size of a file block in the file system.
707 */
708#define ffs_blksize(fs, ip, lbn) \
709 (((lbn) >= UFS_NDADDR || (ip)->i_size >= ffs_lblktosize(fs, (lbn) + 1)) \
710 ? (fs)->fs_bsize \
711 : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (ip)->i_size))))
712
713#define ffs_sblksize(fs, size, lbn) \
714 (((lbn) >= UFS_NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
715 ? (fs)->fs_bsize \
716 : ((int32_t)ffs_fragroundup(fs, ffs_blkoff(fs, (uint64_t)(size)))))
717
718
719/*
720 * Number of inodes in a secondary storage block/fragment.
721 */
722#define FFS_INOPB(fs) ((fs)->fs_inopb)
723#define FFS_INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
724
725/*
726 * Number of indirects in a file system block.
727 */
728#define FFS_NINDIR(fs) ((fs)->fs_nindir)
729
730/*
731 * Apple UFS Label:
732 * We check for this to decide to use APPLEUFS_DIRBLKSIZ
733 */
734#define APPLEUFS_LABEL_MAGIC 0x4c41424c /* LABL */
735#define APPLEUFS_LABEL_SIZE 1024
736#define APPLEUFS_LABEL_OFFSET (BBSIZE - APPLEUFS_LABEL_SIZE) /* located at 7k */
737#define APPLEUFS_LABEL_VERSION 1
738#define APPLEUFS_MAX_LABEL_NAME 512
739
740struct appleufslabel {
741 u_int32_t ul_magic;
742 u_int16_t ul_checksum;
743 u_int16_t ul_unused0;
744 u_int32_t ul_version;
745 u_int32_t ul_time;
746 u_int16_t ul_namelen;
747 u_char ul_name[APPLEUFS_MAX_LABEL_NAME]; /* Warning: may not be null terminated */
748 u_int16_t ul_unused1;
749 u_int64_t ul_uuid; /* Note this is only 4 byte aligned */
750 u_char ul_reserved[24];
751 u_char ul_unused[460];
752} __packed;
753
754
755#endif /* !_UFS_FFS_FS_H_ */
756