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1.1 root 1: /*-
2: * Copyright (c) 1982, 1986, 1993
3: * The Regents of the University of California. All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 4. Neither the name of the University nor the names of its contributors
14: * may be used to endorse or promote products derived from this software
15: * without specific prior written permission.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: *
29: * @(#)fs.h 8.13 (Berkeley) 3/21/95
30: * $FreeBSD: src/sys/ufs/ffs/fs.h,v 1.43.2.3 2005/02/28 16:04:53 delphij Exp $
31: */
32:
33: #ifndef _UFS_FFS_FS_H_
34: #define _UFS_FFS_FS_H_
35:
36: /*
37: * Each disk drive contains some number of filesystems.
38: * A filesystem consists of a number of cylinder groups.
39: * Each cylinder group has inodes and data.
40: *
41: * A filesystem is described by its super-block, which in turn
42: * describes the cylinder groups. The super-block is critical
43: * data and is replicated in each cylinder group to protect against
44: * catastrophic loss. This is done at `newfs' time and the critical
45: * super-block data does not change, so the copies need not be
46: * referenced further unless disaster strikes.
47: *
48: * For filesystem fs, the offsets of the various blocks of interest
49: * are given in the super block as:
50: * [fs->fs_sblkno] Super-block
51: * [fs->fs_cblkno] Cylinder group block
52: * [fs->fs_iblkno] Inode blocks
53: * [fs->fs_dblkno] Data blocks
54: * The beginning of cylinder group cg in fs, is given by
55: * the ``cgbase(fs, cg)'' macro.
56: *
57: * Depending on the architecture and the media, the superblock may
58: * reside in any one of four places. For tiny media where every block
59: * counts, it is placed at the very front of the partition. Historically,
60: * UFS1 placed it 8K from the front to leave room for the disk label and
61: * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
62: * room for the disk label and a bigger bootstrap, and for really piggy
63: * systems we check at 256K from the front if the first three fail. In
64: * all cases the size of the superblock will be SBLOCKSIZE. All values are
65: * given in byte-offset form, so they do not imply a sector size. The
66: * SBLOCKSEARCH specifies the order in which the locations should be searched.
67: */
68: #define SBLOCK_FLOPPY 0
69: #define SBLOCK_UFS1 8192
70: #define SBLOCK_UFS2 65536
71: #define SBLOCK_PIGGY 262144
72: #define SBLOCKSIZE 8192
73: #define SBLOCKSEARCH \
74: { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
75:
76: /*
77: * Max number of fragments per block. This value is NOT tweakable.
78: */
79: #define MAXFRAG 8
80:
81: /*
82: * Addresses stored in inodes are capable of addressing fragments
83: * of `blocks'. File system blocks of at most size MAXBSIZE can
84: * be optionally broken into 2, 4, or 8 pieces, each of which is
85: * addressable; these pieces may be DEV_BSIZE, or some multiple of
86: * a DEV_BSIZE unit.
87: *
88: * Large files consist of exclusively large data blocks. To avoid
89: * undue wasted disk space, the last data block of a small file may be
90: * allocated as only as many fragments of a large block as are
91: * necessary. The filesystem format retains only a single pointer
92: * to such a fragment, which is a piece of a single large block that
93: * has been divided. The size of such a fragment is determinable from
94: * information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
95: *
96: * The filesystem records space availability at the fragment level;
97: * to determine block availability, aligned fragments are examined.
98: */
99:
100: /*
101: * MINBSIZE is the smallest allowable block size.
102: * In order to insure that it is possible to create files of size
103: * 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
104: * MINBSIZE must be big enough to hold a cylinder group block,
105: * thus changes to (struct cg) must keep its size within MINBSIZE.
106: * Note that super blocks are always of size SBSIZE,
107: * and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
108: */
109: #define MINBSIZE 4096
110:
111: /*
112: * The path name on which the filesystem is mounted is maintained
113: * in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
114: * the super block for this name.
115: */
116: #define MAXMNTLEN 468
117:
118: /*
119: * The volume name for this filesystem is maintained in fs_volname.
120: * MAXVOLLEN defines the length of the buffer allocated.
121: */
122: #define MAXVOLLEN 32
123:
124: /*
125: * There is a 128-byte region in the superblock reserved for in-core
126: * pointers to summary information. Originally this included an array
127: * of pointers to blocks of struct csum; now there are just a few
128: * pointers and the remaining space is padded with fs_ocsp[].
129: *
130: * NOCSPTRS determines the size of this padding. One pointer (fs_csp)
131: * is taken away to point to a contiguous array of struct csum for
132: * all cylinder groups; a second (fs_maxcluster) points to an array
133: * of cluster sizes that is computed as cylinder groups are inspected,
134: * and the third points to an array that tracks the creation of new
135: * directories. A fourth pointer, fs_active, is used when creating
136: * snapshots; it points to a bitmap of cylinder groups for which the
137: * free-block bitmap has changed since the snapshot operation began.
138: */
139: #define NOCSPTRS ((128 / sizeof(void *)) - 4)
140:
141: /*
142: * A summary of contiguous blocks of various sizes is maintained
143: * in each cylinder group. Normally this is set by the initial
144: * value of fs_maxcontig. To conserve space, a maximum summary size
145: * is set by FS_MAXCONTIG.
146: */
147: #define FS_MAXCONTIG 16
148:
149: /*
150: * MINFREE gives the minimum acceptable percentage of filesystem
151: * blocks which may be free. If the freelist drops below this level
152: * only the superuser may continue to allocate blocks. This may
153: * be set to 0 if no reserve of free blocks is deemed necessary,
154: * however throughput drops by fifty percent if the filesystem
155: * is run at between 95% and 100% full; thus the minimum default
156: * value of fs_minfree is 5%. However, to get good clustering
157: * performance, 10% is a better choice. hence we use 10% as our
158: * default value. With 10% free space, fragmentation is not a
159: * problem, so we choose to optimize for time.
160: */
161: #define MINFREE 8
162: #define DEFAULTOPT FS_OPTTIME
163:
164: /*
165: * Grigoriy Orlov <[email protected]> has done some extensive work to fine
166: * tune the layout preferences for directories within a filesystem.
167: * His algorithm can be tuned by adjusting the following parameters
168: * which tell the system the average file size and the average number
169: * of files per directory. These defaults are well selected for typical
170: * filesystems, but may need to be tuned for odd cases like filesystems
171: * being used for squid caches or news spools.
172: */
173: #define AVFILESIZ 16384 /* expected average file size */
174: #define AFPDIR 64 /* expected number of files per directory */
175:
176: /*
177: * The maximum number of snapshot nodes that can be associated
178: * with each filesystem. This limit affects only the number of
179: * snapshot files that can be recorded within the superblock so
180: * that they can be found when the filesystem is mounted. However,
181: * maintaining too many will slow the filesystem performance, so
182: * having this limit is a good idea.
183: */
184: #define FSMAXSNAP 20
185:
186: /*
187: * Used to identify special blocks in snapshots:
188: *
189: * BLK_NOCOPY - A block that was unallocated at the time the snapshot
190: * was taken, hence does not need to be copied when written.
191: * BLK_SNAP - A block held by another snapshot that is not needed by this
192: * snapshot. When the other snapshot is freed, the BLK_SNAP entries
193: * are converted to BLK_NOCOPY. These are needed to allow fsck to
194: * identify blocks that are in use by other snapshots (which are
195: * expunged from this snapshot).
196: */
197: #define BLK_NOCOPY ((ufs2_daddr_t)(1))
198: #define BLK_SNAP ((ufs2_daddr_t)(2))
199:
200: /*
201: * Sysctl values for the fast filesystem.
202: */
203: #define FFS_ADJ_REFCNT 1 /* adjust inode reference count */
204: #define FFS_ADJ_BLKCNT 2 /* adjust inode used block count */
205: #define FFS_BLK_FREE 3 /* free range of blocks in map */
206: #define FFS_DIR_FREE 4 /* free specified dir inodes in map */
207: #define FFS_FILE_FREE 5 /* free specified file inodes in map */
208: #define FFS_SET_FLAGS 6 /* set filesystem flags */
209: #define FFS_ADJ_NDIR 7 /* adjust number of directories */
210: #define FFS_ADJ_NBFREE 8 /* adjust number of free blocks */
211: #define FFS_ADJ_NIFREE 9 /* adjust number of free inodes */
212: #define FFS_ADJ_NFFREE 10 /* adjust number of free frags */
213: #define FFS_ADJ_NUMCLUSTERS 11 /* adjust number of free clusters */
214: #define FFS_MAXID 12 /* number of valid ffs ids */
215:
216: /*
217: * Command structure passed in to the filesystem to adjust filesystem values.
218: */
219: #define FFS_CMD_VERSION 0x19790518 /* version ID */
220: struct fsck_cmd {
221: int32_t version; /* version of command structure */
222: int32_t handle; /* reference to filesystem to be changed */
223: int64_t value; /* inode or block number to be affected */
224: int64_t size; /* amount or range to be adjusted */
225: int64_t spare; /* reserved for future use */
226: };
227:
228: /*
229: * Per cylinder group information; summarized in blocks allocated
230: * from first cylinder group data blocks. These blocks have to be
231: * read in from fs_csaddr (size fs_cssize) in addition to the
232: * super block.
233: */
234: struct csum {
235: int32_t cs_ndir; /* number of directories */
236: int32_t cs_nbfree; /* number of free blocks */
237: int32_t cs_nifree; /* number of free inodes */
238: int32_t cs_nffree; /* number of free frags */
239: };
240: struct csum_total {
241: int64_t cs_ndir; /* number of directories */
242: int64_t cs_nbfree; /* number of free blocks */
243: int64_t cs_nifree; /* number of free inodes */
244: int64_t cs_nffree; /* number of free frags */
245: int64_t cs_numclusters; /* number of free clusters */
246: int64_t cs_spare[3]; /* future expansion */
247: };
248:
249: /*
250: * Super block for an FFS filesystem.
251: */
252: struct fs {
253: int32_t fs_firstfield; /* historic filesystem linked list, */
254: int32_t fs_unused_1; /* used for incore super blocks */
255: int32_t fs_sblkno; /* offset of super-block in filesys */
256: int32_t fs_cblkno; /* offset of cyl-block in filesys */
257: int32_t fs_iblkno; /* offset of inode-blocks in filesys */
258: int32_t fs_dblkno; /* offset of first data after cg */
259: int32_t fs_old_cgoffset; /* cylinder group offset in cylinder */
260: int32_t fs_old_cgmask; /* used to calc mod fs_ntrak */
261: int32_t fs_old_time; /* last time written */
262: int32_t fs_old_size; /* number of blocks in fs */
263: int32_t fs_old_dsize; /* number of data blocks in fs */
264: int32_t fs_ncg; /* number of cylinder groups */
265: int32_t fs_bsize; /* size of basic blocks in fs */
266: int32_t fs_fsize; /* size of frag blocks in fs */
267: int32_t fs_frag; /* number of frags in a block in fs */
268: /* these are configuration parameters */
269: int32_t fs_minfree; /* minimum percentage of free blocks */
270: int32_t fs_old_rotdelay; /* num of ms for optimal next block */
271: int32_t fs_old_rps; /* disk revolutions per second */
272: /* these fields can be computed from the others */
273: int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
274: int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
275: int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
276: int32_t fs_fshift; /* ``numfrags'' calc number of frags */
277: /* these are configuration parameters */
278: int32_t fs_maxcontig; /* max number of contiguous blks */
279: int32_t fs_maxbpg; /* max number of blks per cyl group */
280: /* these fields can be computed from the others */
281: int32_t fs_fragshift; /* block to frag shift */
282: int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
283: int32_t fs_sbsize; /* actual size of super block */
284: int32_t fs_spare1[2]; /* old fs_csmask */
285: /* old fs_csshift */
286: int32_t fs_nindir; /* value of NINDIR */
287: int32_t fs_inopb; /* value of INOPB */
288: int32_t fs_old_nspf; /* value of NSPF */
289: /* yet another configuration parameter */
290: int32_t fs_optim; /* optimization preference, see below */
291: int32_t fs_old_npsect; /* # sectors/track including spares */
292: int32_t fs_old_interleave; /* hardware sector interleave */
293: int32_t fs_old_trackskew; /* sector 0 skew, per track */
294: int32_t fs_id[2]; /* unique filesystem id */
295: /* sizes determined by number of cylinder groups and their sizes */
296: int32_t fs_old_csaddr; /* blk addr of cyl grp summary area */
297: int32_t fs_cssize; /* size of cyl grp summary area */
298: int32_t fs_cgsize; /* cylinder group size */
299: int32_t fs_spare2; /* old fs_ntrak */
300: int32_t fs_old_nsect; /* sectors per track */
301: int32_t fs_old_spc; /* sectors per cylinder */
302: int32_t fs_old_ncyl; /* cylinders in filesystem */
303: int32_t fs_old_cpg; /* cylinders per group */
304: int32_t fs_ipg; /* inodes per group */
305: int32_t fs_fpg; /* blocks per group * fs_frag */
306: /* this data must be re-computed after crashes */
307: struct csum fs_old_cstotal; /* cylinder summary information */
308: /* these fields are cleared at mount time */
309: int8_t fs_fmod; /* super block modified flag */
310: int8_t fs_clean; /* filesystem is clean flag */
311: int8_t fs_ronly; /* mounted read-only flag */
312: int8_t fs_old_flags; /* old FS_ flags */
313: char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
314: char fs_volname[MAXVOLLEN]; /* volume name */
315: uint64_t fs_swuid; /* system-wide uid */
316: int32_t fs_pad; /* due to alignment of fs_swuid */
317: /* these fields retain the current block allocation info */
318: int32_t fs_cgrotor; /* last cg searched */
319: void *fs_ocsp[NOCSPTRS]; /* padding; was list of fs_cs buffers */
320: uint8_t *fs_contigdirs; /* # of contiguously allocated dirs */
321: struct csum *fs_csp; /* cg summary info buffer for fs_cs */
322: int32_t *fs_maxcluster; /* max cluster in each cyl group */
323: unsigned int *fs_active; /* used by snapshots to track fs */
324: int32_t fs_old_cpc; /* cyl per cycle in postbl */
325: int32_t fs_maxbsize; /* maximum blocking factor permitted */
326: int64_t fs_sparecon64[17]; /* old rotation block list head */
327: int64_t fs_sblockloc; /* byte offset of standard superblock */
328: struct csum_total fs_cstotal; /* cylinder summary information */
329: ufs_time_t fs_time; /* last time written */
330: int64_t fs_size; /* number of blocks in fs */
331: int64_t fs_dsize; /* number of data blocks in fs */
332: ufs2_daddr_t fs_csaddr; /* blk addr of cyl grp summary area */
333: int64_t fs_pendingblocks; /* blocks in process of being freed */
334: int32_t fs_pendinginodes; /* inodes in process of being freed */
335: int32_t fs_snapinum[FSMAXSNAP];/* list of snapshot inode numbers */
336: int32_t fs_avgfilesize; /* expected average file size */
337: int32_t fs_avgfpdir; /* expected # of files per directory */
338: int32_t fs_save_cgsize; /* save real cg size to use fs_bsize */
339: int32_t fs_sparecon32[26]; /* reserved for future constants */
340: int32_t fs_flags; /* see FS_ flags below */
341: int32_t fs_contigsumsize; /* size of cluster summary array */
342: int32_t fs_maxsymlinklen; /* max length of an internal symlink */
343: int32_t fs_old_inodefmt; /* format of on-disk inodes */
344: uint64_t fs_maxfilesize; /* maximum representable file size */
345: int64_t fs_qbmask; /* ~fs_bmask for use with 64-bit size */
346: int64_t fs_qfmask; /* ~fs_fmask for use with 64-bit size */
347: int32_t fs_state; /* validate fs_clean field */
348: int32_t fs_old_postblformat; /* format of positional layout tables */
349: int32_t fs_old_nrpos; /* number of rotational positions */
350: int32_t fs_spare5[2]; /* old fs_postbloff */
351: /* old fs_rotbloff */
352: int32_t fs_magic; /* magic number */
353: };
354:
355: /* Sanity checking. */
356: #ifdef CTASSERT
357: CTASSERT(sizeof(struct fs) == 1376);
358: #endif
359:
360: /*
361: * Filesystem identification
362: */
363: #define FS_UFS1_MAGIC 0x011954 /* UFS1 fast filesystem magic number */
364: #define FS_UFS2_MAGIC 0x19540119 /* UFS2 fast filesystem magic number */
365: #define FS_BAD_MAGIC 0x19960408 /* UFS incomplete newfs magic number */
366: #define FS_OKAY 0x7c269d38 /* superblock checksum */
367: #define FS_42INODEFMT -1 /* 4.2BSD inode format */
368: #define FS_44INODEFMT 2 /* 4.4BSD inode format */
369:
370: /*
371: * Preference for optimization.
372: */
373: #define FS_OPTTIME 0 /* minimize allocation time */
374: #define FS_OPTSPACE 1 /* minimize disk fragmentation */
375:
376: /*
377: * Filesystem flags.
378: *
379: * The FS_UNCLEAN flag is set by the kernel when the filesystem was
380: * mounted with fs_clean set to zero. The FS_DOSOFTDEP flag indicates
381: * that the filesystem should be managed by the soft updates code.
382: * Note that the FS_NEEDSFSCK flag is set and cleared only by the
383: * fsck utility. It is set when background fsck finds an unexpected
384: * inconsistency which requires a traditional foreground fsck to be
385: * run. Such inconsistencies should only be found after an uncorrectable
386: * disk error. A foreground fsck will clear the FS_NEEDSFSCK flag when
387: * it has successfully cleaned up the filesystem. The kernel uses this
388: * flag to enforce that inconsistent filesystems be mounted read-only.
389: * The FS_INDEXDIRS flag when set indicates that the kernel maintains
390: * on-disk auxiliary indexes (such as B-trees) for speeding directory
391: * accesses. Kernels that do not support auxiliary indicies clear the
392: * flag to indicate that the indicies need to be rebuilt (by fsck) before
393: * they can be used.
394: *
395: * FS_ACLS indicates that ACLs are administratively enabled for the
396: * file system, so they should be loaded from extended attributes,
397: * observed for access control purposes, and be administered by object
398: * owners. FS_MULTILABEL indicates that the TrustedBSD MAC Framework
399: * should attempt to back MAC labels into extended attributes on the
400: * file system rather than maintain a single mount label for all
401: * objects.
402: */
403: #define FS_UNCLEAN 0x01 /* filesystem not clean at mount */
404: #define FS_DOSOFTDEP 0x02 /* filesystem using soft dependencies */
405: #define FS_NEEDSFSCK 0x04 /* filesystem needs sync fsck before mount */
406: #define FS_INDEXDIRS 0x08 /* kernel supports indexed directories */
407: #define FS_ACLS 0x10 /* file system has ACLs enabled */
408: #define FS_MULTILABEL 0x20 /* file system is MAC multi-label */
409: #define FS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
410:
411: /*
412: * Macros to access bits in the fs_active array.
413: */
414: #define ACTIVECGNUM(fs, cg) ((fs)->fs_active[(cg) / (NBBY * sizeof(int))])
415: #define ACTIVECGOFF(cg) (1 << ((cg) % (NBBY * sizeof(int))))
416:
417: /*
418: * The size of a cylinder group is calculated by CGSIZE. The maximum size
419: * is limited by the fact that cylinder groups are at most one block.
420: * Its size is derived from the size of the maps maintained in the
421: * cylinder group and the (struct cg) size.
422: */
423: #define CGSIZE(fs) \
424: /* base cg */ (sizeof(struct cg) + sizeof(int32_t) + \
425: /* old btotoff */ (fs)->fs_old_cpg * sizeof(int32_t) + \
426: /* old boff */ (fs)->fs_old_cpg * sizeof(uint16_t) + \
427: /* inode map */ howmany((fs)->fs_ipg, NBBY) + \
428: /* block map */ howmany((fs)->fs_fpg, NBBY) +\
429: /* if present */ ((fs)->fs_contigsumsize <= 0 ? 0 : \
430: /* cluster sum */ (fs)->fs_contigsumsize * sizeof(int32_t) + \
431: /* cluster map */ howmany(fragstoblks(fs, (fs)->fs_fpg), NBBY)))
432:
433: /*
434: * The minimal number of cylinder groups that should be created.
435: */
436: #define MINCYLGRPS 4
437:
438: /*
439: * Convert cylinder group to base address of its global summary info.
440: */
441: #define fs_cs(fs, indx) fs_csp[indx]
442:
443: /*
444: * Cylinder group block for a filesystem.
445: */
446: #define CG_MAGIC 0x090255
447: struct cg {
448: int32_t cg_firstfield; /* historic cyl groups linked list */
449: int32_t cg_magic; /* magic number */
450: int32_t cg_old_time; /* time last written */
451: int32_t cg_cgx; /* we are the cgx'th cylinder group */
452: int16_t cg_old_ncyl; /* number of cyl's this cg */
453: int16_t cg_old_niblk; /* number of inode blocks this cg */
454: int32_t cg_ndblk; /* number of data blocks this cg */
455: struct csum cg_cs; /* cylinder summary information */
456: int32_t cg_rotor; /* position of last used block */
457: int32_t cg_frotor; /* position of last used frag */
458: int32_t cg_irotor; /* position of last used inode */
459: int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
460: int32_t cg_old_btotoff; /* (int32) block totals per cylinder */
461: int32_t cg_old_boff; /* (uint16) free block positions */
462: int32_t cg_iusedoff; /* (uint8) used inode map */
463: int32_t cg_freeoff; /* (uint8) free block map */
464: int32_t cg_nextfreeoff; /* (uint8) next available space */
465: int32_t cg_clustersumoff; /* (uint32) counts of avail clusters */
466: int32_t cg_clusteroff; /* (uint8) free cluster map */
467: int32_t cg_nclusterblks; /* number of clusters this cg */
468: int32_t cg_niblk; /* number of inode blocks this cg */
469: int32_t cg_initediblk; /* last initialized inode */
470: int32_t cg_sparecon32[3]; /* reserved for future use */
471: ufs_time_t cg_time; /* time last written */
472: int64_t cg_sparecon64[3]; /* reserved for future use */
473: uint8_t cg_space[1]; /* space for cylinder group maps */
474: /* actually longer */
475: };
476:
477: /*
478: * Macros for access to cylinder group array structures
479: */
480: #define cg_chkmagic(cgp) ((cgp)->cg_magic == CG_MAGIC)
481: #define cg_inosused(cgp) \
482: ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_iusedoff))
483: #define cg_blksfree(cgp) \
484: ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_freeoff))
485: #define cg_clustersfree(cgp) \
486: ((uint8_t *)((uint8_t *)(cgp) + (cgp)->cg_clusteroff))
487: #define cg_clustersum(cgp) \
488: ((int32_t *)((uintptr_t)(cgp) + (cgp)->cg_clustersumoff))
489:
490: /*
491: * Turn filesystem block numbers into disk block addresses.
492: * This maps filesystem blocks to device size blocks.
493: */
494: #define fsbtodb(fs, b) ((b) << (fs)->fs_fsbtodb)
495: #define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
496:
497: /*
498: * Cylinder group macros to locate things in cylinder groups.
499: * They calc filesystem addresses of cylinder group data structures.
500: */
501: #define cgbase(fs, c) (((ufs2_daddr_t)(fs)->fs_fpg) * (c))
502: #define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_dblkno) /* 1st data */
503: #define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
504: #define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
505: #define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
506: #define cgstart(fs, c) \
507: ((fs)->fs_magic == FS_UFS2_MAGIC ? cgbase(fs, c) : \
508: (cgbase(fs, c) + (fs)->fs_old_cgoffset * ((c) & ~((fs)->fs_old_cgmask))))
509:
510: /*
511: * Macros for handling inode numbers:
512: * inode number to filesystem block offset.
513: * inode number to cylinder group number.
514: * inode number to filesystem block address.
515: */
516: #define ino_to_cg(fs, x) ((x) / (fs)->fs_ipg)
517: #define ino_to_fsba(fs, x) \
518: ((ufs2_daddr_t)(cgimin(fs, ino_to_cg(fs, x)) + \
519: (blkstofrags((fs), (((x) % (fs)->fs_ipg) / INOPB(fs))))))
520: #define ino_to_fsbo(fs, x) ((x) % INOPB(fs))
521:
522: /*
523: * Give cylinder group number for a filesystem block.
524: * Give cylinder group block number for a filesystem block.
525: */
526: #define dtog(fs, d) ((d) / (fs)->fs_fpg)
527: #define dtogd(fs, d) ((d) % (fs)->fs_fpg)
528:
529: /*
530: * Extract the bits for a block from a map.
531: * Compute the cylinder and rotational position of a cyl block addr.
532: */
533: #define blkmap(fs, map, loc) \
534: (((map)[(loc) / NBBY] >> ((loc) % NBBY)) & (0xff >> (NBBY - (fs)->fs_frag)))
535:
536: /*
537: * The following macros optimize certain frequently calculated
538: * quantities by using shifts and masks in place of divisions
539: * modulos and multiplications.
540: */
541: #define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
542: ((loc) & (fs)->fs_qbmask)
543: #define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
544: ((loc) & (fs)->fs_qfmask)
545: #define lfragtosize(fs, frag) /* calculates ((off_t)frag * fs->fs_fsize) */ \
546: (((off_t)(frag)) << (fs)->fs_fshift)
547: #define lblktosize(fs, blk) /* calculates ((off_t)blk * fs->fs_bsize) */ \
548: (((off_t)(blk)) << (fs)->fs_bshift)
549: /* Use this only when `blk' is known to be small, e.g., < NDADDR. */
550: #define smalllblktosize(fs, blk) /* calculates (blk * fs->fs_bsize) */ \
551: ((blk) << (fs)->fs_bshift)
552: #define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
553: ((loc) >> (fs)->fs_bshift)
554: #define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
555: ((loc) >> (fs)->fs_fshift)
556: #define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
557: (((size) + (fs)->fs_qbmask) & (fs)->fs_bmask)
558: #define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
559: (((size) + (fs)->fs_qfmask) & (fs)->fs_fmask)
560: #define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
561: ((frags) >> (fs)->fs_fragshift)
562: #define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
563: ((blks) << (fs)->fs_fragshift)
564: #define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
565: ((fsb) & ((fs)->fs_frag - 1))
566: #define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
567: ((fsb) &~ ((fs)->fs_frag - 1))
568:
569: /*
570: * Determine the number of available frags given a
571: * percentage to hold in reserve.
572: */
573: #define freespace(fs, percentreserved) \
574: (blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
575: (fs)->fs_cstotal.cs_nffree - \
576: (((off_t)((fs)->fs_dsize)) * (percentreserved) / 100))
577:
578: /*
579: * Determining the size of a file block in the filesystem.
580: */
581: #define blksize(fs, ip, lbn) \
582: (((lbn) >= NDADDR || (ip)->i_size >= smalllblktosize(fs, (lbn) + 1)) \
583: ? (fs)->fs_bsize \
584: : (fragroundup(fs, blkoff(fs, (ip)->i_size))))
585: #define sblksize(fs, size, lbn) \
586: (((lbn) >= NDADDR || (size) >= ((lbn) + 1) << (fs)->fs_bshift) \
587: ? (fs)->fs_bsize \
588: : (fragroundup(fs, blkoff(fs, (size)))))
589:
590:
591: /*
592: * Number of inodes in a secondary storage block/fragment.
593: */
594: #define INOPB(fs) ((fs)->fs_inopb)
595: #define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
596:
597: /*
598: * Number of indirects in a filesystem block.
599: */
600: #define NINDIR(fs) ((fs)->fs_nindir)
601:
602: extern int inside[], around[];
603: extern char *fragtbl[];
604:
605: struct ufs_dirent {
606: uint32_t d_fileno; /* file number of entry */
607: uint16_t d_reclen; /* length of this record */
608: uint8_t d_type; /* file type, see below */
609: uint8_t d_namlen; /* length of string in d_name */
610: #define MAXNAMLEN 255
611: char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */
612: };
613:
614: /*
615: * File types
616: */
617: #define DT_UNKNOWN 0
618: #define DT_FIFO 1
619: #define DT_CHR 2
620: #define DT_DIR 4
621: #define DT_BLK 6
622: #define DT_REG 8
623: #define DT_LNK 10
624: #define DT_SOCK 12
625: #define DT_WHT 14
626:
627: /* XXX: We hardcode BSIZE and BSIZE_SHIFT here. fsys_ffs seems to do the same,
628: * so we should get away with it :-) */
629: #define DEV_BSIZE 512
630: #define DEV_BSHIFT 9 /* 2**9 = 512 */
631: #define MAXBSIZE 8192
632:
633: typedef unsigned int ino_t;
634:
635: #endif
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