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1.1 root 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 <[email protected]> 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: */
237: struct 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:
244: struct 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: */
256: struct 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
495: struct 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: */
529: struct 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:
740: struct 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_ */
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