include/linux/ufs_fs.h

   1 /*
   2  *  linux/include/linux/ufs_fs.h
   3  *
   4  * Copyright (C) 1996
   5  * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
   6  * Laboratory for Computer Science Research Computing Facility
   7  * Rutgers, The State University of New Jersey
   8  *
   9  * Clean swab support by Fare <fare@tunes.org>
  10  * just hope no one is using NNUUXXI on __?64 structure elements
  11  * 64-bit clean thanks to Maciej W. Rozycki <macro@ds2.pg.gda.pl>
  12  *
  13  * 4.4BSD (FreeBSD) support added on February 1st 1998 by
  14  * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
  15  * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
  16  *
  17  * NeXTstep support added on February 5th 1998 by
  18  * Niels Kristian Bech Jensen <nkbj@image.dk>.
  19  *
  20  * Write support by Daniel Pirkl <daniel.pirkl@email.cz>
  21  *
  22  * HP/UX hfs filesystem support added by
  23  * Martin K. Petersen <mkp@mkp.net>, August 1999
  24  *
  25  * UFS2 (of FreeBSD 5.x) support added by
  26  * Niraj Kumar <niraj17@iitbombay.org>  , Jan 2004
  27  *
  28  */
  29
  30 #ifndef __LINUX_UFS_FS_H
  31 #define __LINUX_UFS_FS_H
  32
  33 #include <linux/types.h>
  34 #include <linux/kernel.h>
  35 #include <linux/stat.h>
  36 #include <linux/fs.h>
  37
  38 #ifndef __KERNEL__
  39 typedef __u64 __fs64;
  40 typedef __u32 __fs32;
  41 typedef __u16 __fs16;
  42 #else
  43 #include <asm/div64.h>
  44 typedef __u64 __bitwise __fs64;
  45 typedef __u32 __bitwise __fs32;
  46 typedef __u16 __bitwise __fs16;
  47 #endif
  48
  49 #define UFS_BBLOCK 0
  50 #define UFS_BBSIZE 8192
  51 #define UFS_SBLOCK 8192
  52 #define UFS_SBSIZE 8192
  53
  54 #define UFS_SECTOR_SIZE 512
  55 #define UFS_SECTOR_BITS 9
  56 #define UFS_MAGIC  0x00011954
  57 #define UFS2_MAGIC 0x19540119
  58 #define UFS_CIGAM  0x54190100 /* byteswapped MAGIC */
  59
  60 /* Copied from FreeBSD */
  61 /*
  62  * Each disk drive contains some number of filesystems.
  63  * A filesystem consists of a number of cylinder groups.
  64  * Each cylinder group has inodes and data.
  65  *
  66  * A filesystem is described by its super-block, which in turn
  67  * describes the cylinder groups.  The super-block is critical
  68  * data and is replicated in each cylinder group to protect against
  69  * catastrophic loss.  This is done at `newfs' time and the critical
  70  * super-block data does not change, so the copies need not be
  71  * referenced further unless disaster strikes.
  72  *
  73  * For filesystem fs, the offsets of the various blocks of interest
  74  * are given in the super block as:
  75  *      [fs->fs_sblkno]         Super-block
  76  *      [fs->fs_cblkno]         Cylinder group block
  77  *      [fs->fs_iblkno]         Inode blocks
  78  *      [fs->fs_dblkno]         Data blocks
  79  * The beginning of cylinder group cg in fs, is given by
  80  * the ``cgbase(fs, cg)'' macro.
  81  *
  82  * Depending on the architecture and the media, the superblock may
  83  * reside in any one of four places. For tiny media where every block
  84  * counts, it is placed at the very front of the partition. Historically,
  85  * UFS1 placed it 8K from the front to leave room for the disk label and
  86  * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
  87  * room for the disk label and a bigger bootstrap, and for really piggy
  88  * systems we check at 256K from the front if the first three fail. In
  89  * all cases the size of the superblock will be SBLOCKSIZE. All values are
  90  * given in byte-offset form, so they do not imply a sector size. The
  91  * SBLOCKSEARCH specifies the order in which the locations should be searched.
  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 #define SBLOCKSEARCH \
  99         { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
 100
 101
 102 /* HP specific MAGIC values */
 103
 104 #define UFS_MAGIC_LFN   0x00095014 /* fs supports filenames > 14 chars */
 105 #define UFS_CIGAM_LFN   0x14500900 /* srahc 41 < semanelif stroppus sf */
 106
 107 #define UFS_MAGIC_SEC   0x00612195 /* B1 security fs */
 108 #define UFS_CIGAM_SEC   0x95216100
 109
 110 #define UFS_MAGIC_FEA   0x00195612 /* fs_featurebits supported */
 111 #define UFS_CIGAM_FEA   0x12561900
 112
 113 #define UFS_MAGIC_4GB   0x05231994 /* fs > 4 GB && fs_featurebits */
 114 #define UFS_CIGAM_4GB   0x94192305
 115
 116 /* Seems somebody at HP goofed here. B1 and lfs are both 0x2 !?! */
 117 #define UFS_FSF_LFN     0x00000001 /* long file names */
 118 #define UFS_FSF_B1      0x00000002 /* B1 security */
 119 #define UFS_FSF_LFS     0x00000002 /* large files */
 120 #define UFS_FSF_LUID    0x00000004 /* large UIDs */
 121
 122 /* End of HP stuff */
 123
 124
 125 #define UFS_BSIZE       8192
 126 #define UFS_MINBSIZE    4096
 127 #define UFS_FSIZE       1024
 128 #define UFS_MAXFRAG     (UFS_BSIZE / UFS_FSIZE)
 129
 130 #define UFS_NDADDR 12
 131 #define UFS_NINDIR 3
 132
 133 #define UFS_IND_BLOCK   (UFS_NDADDR + 0)
 134 #define UFS_DIND_BLOCK  (UFS_NDADDR + 1)
 135 #define UFS_TIND_BLOCK  (UFS_NDADDR + 2)
 136
 137 #define UFS_NDIR_FRAGMENT (UFS_NDADDR << uspi->s_fpbshift)
 138 #define UFS_IND_FRAGMENT (UFS_IND_BLOCK << uspi->s_fpbshift)
 139 #define UFS_DIND_FRAGMENT (UFS_DIND_BLOCK << uspi->s_fpbshift)
 140 #define UFS_TIND_FRAGMENT (UFS_TIND_BLOCK << uspi->s_fpbshift)
 141
 142 #define UFS_ROOTINO 2
 143 #define UFS_FIRST_INO (UFS_ROOTINO + 1)
 144
 145 #define UFS_USEEFT  ((__u16)65535)
 146
 147 #define UFS_FSOK      0x7c269d38
 148 #define UFS_FSACTIVE  ((__s8)0x00)
 149 #define UFS_FSCLEAN   ((__s8)0x01)
 150 #define UFS_FSSTABLE  ((__s8)0x02)
 151 #define UFS_FSOSF1    ((__s8)0x03)      /* is this correct for DEC OSF/1? */
 152 #define UFS_FSBAD     ((__s8)0xff)
 153
 154 /* From here to next blank line, s_flags for ufs_sb_info */
 155 /* directory entry encoding */
 156 #define UFS_DE_MASK             0x00000010      /* mask for the following */
 157 #define UFS_DE_OLD              0x00000000
 158 #define UFS_DE_44BSD            0x00000010
 159 /* uid encoding */
 160 #define UFS_UID_MASK            0x00000060      /* mask for the following */
 161 #define UFS_UID_OLD             0x00000000
 162 #define UFS_UID_44BSD           0x00000020
 163 #define UFS_UID_EFT             0x00000040
 164 /* superblock state encoding */
 165 #define UFS_ST_MASK             0x00000700      /* mask for the following */
 166 #define UFS_ST_OLD              0x00000000
 167 #define UFS_ST_44BSD            0x00000100
 168 #define UFS_ST_SUN              0x00000200 /* Solaris */
 169 #define UFS_ST_SUNOS            0x00000300
 170 #define UFS_ST_SUNx86           0x00000400 /* Solaris x86 */
 171 /*cylinder group encoding */
 172 #define UFS_CG_MASK             0x00003000      /* mask for the following */
 173 #define UFS_CG_OLD              0x00000000
 174 #define UFS_CG_44BSD            0x00002000
 175 #define UFS_CG_SUN              0x00001000
 176 /* filesystem type encoding */
 177 #define UFS_TYPE_MASK           0x00010000      /* mask for the following */
 178 #define UFS_TYPE_UFS1           0x00000000
 179 #define UFS_TYPE_UFS2           0x00010000
 180
 181
 182 /* fs_inodefmt options */
 183 #define UFS_42INODEFMT  -1
 184 #define UFS_44INODEFMT  2
 185
 186 /*
 187  * MINFREE gives the minimum acceptable percentage of file system
 188  * blocks which may be free. If the freelist drops below this level
 189  * only the superuser may continue to allocate blocks. This may
 190  * be set to 0 if no reserve of free blocks is deemed necessary,
 191  * however throughput drops by fifty percent if the file system
 192  * is run at between 95% and 100% full; thus the minimum default
 193  * value of fs_minfree is 5%. However, to get good clustering
 194  * performance, 10% is a better choice. hence we use 10% as our
 195  * default value. With 10% free space, fragmentation is not a
 196  * problem, so we choose to optimize for time.
 197  */
 198 #define UFS_MINFREE         5
 199 #define UFS_DEFAULTOPT      UFS_OPTTIME
 200
 201 /*
 202  * Turn file system block numbers into disk block addresses.
 203  * This maps file system blocks to device size blocks.
 204  */
 205 #define ufs_fsbtodb(uspi, b)    ((b) << (uspi)->s_fsbtodb)
 206 #define ufs_dbtofsb(uspi, b)    ((b) >> (uspi)->s_fsbtodb)
 207
 208 /*
 209  * Cylinder group macros to locate things in cylinder groups.
 210  * They calc file system addresses of cylinder group data structures.
 211  */
 212 #define ufs_cgbase(c)   (uspi->s_fpg * (c))
 213 #define ufs_cgstart(c)  ((uspi)->fs_magic == UFS2_MAGIC ?  ufs_cgbase(c) : \
 214         (ufs_cgbase(c)  + uspi->s_cgoffset * ((c) & ~uspi->s_cgmask)))
 215 #define ufs_cgsblock(c) (ufs_cgstart(c) + uspi->s_sblkno)       /* super blk */
 216 #define ufs_cgcmin(c)   (ufs_cgstart(c) + uspi->s_cblkno)       /* cg block */
 217 #define ufs_cgimin(c)   (ufs_cgstart(c) + uspi->s_iblkno)       /* inode blk */
 218 #define ufs_cgdmin(c)   (ufs_cgstart(c) + uspi->s_dblkno)       /* 1st data */
 219
 220 /*
 221  * Macros for handling inode numbers:
 222  *     inode number to file system block offset.
 223  *     inode number to cylinder group number.
 224  *     inode number to file system block address.
 225  */
 226 #define ufs_inotocg(x)          ((x) / uspi->s_ipg)
 227 #define ufs_inotocgoff(x)       ((x) % uspi->s_ipg)
 228 #define ufs_inotofsba(x)        (((u64)ufs_cgimin(ufs_inotocg(x))) + ufs_inotocgoff(x) / uspi->s_inopf)
 229 #define ufs_inotofsbo(x)        ((x) % uspi->s_inopf)
 230
 231 /*
 232  * Compute the cylinder and rotational position of a cyl block addr.
 233  */
 234 #define ufs_cbtocylno(bno) \
 235         ((bno) * uspi->s_nspf / uspi->s_spc)
 236 #define ufs_cbtorpos(bno) \
 237         ((((bno) * uspi->s_nspf % uspi->s_spc / uspi->s_nsect \
 238         * uspi->s_trackskew + (bno) * uspi->s_nspf % uspi->s_spc \
 239         % uspi->s_nsect * uspi->s_interleave) % uspi->s_nsect \
 240         * uspi->s_nrpos) / uspi->s_npsect)
 241
 242 /*
 243  * The following macros optimize certain frequently calculated
 244  * quantities by using shifts and masks in place of divisions
 245  * modulos and multiplications.
 246  */
 247 #define ufs_blkoff(loc)         ((loc) & uspi->s_qbmask)
 248 #define ufs_fragoff(loc)        ((loc) & uspi->s_qfmask)
 249 #define ufs_lblktosize(blk)     ((blk) << uspi->s_bshift)
 250 #define ufs_lblkno(loc)         ((loc) >> uspi->s_bshift)
 251 #define ufs_numfrags(loc)       ((loc) >> uspi->s_fshift)
 252 #define ufs_blkroundup(size)    (((size) + uspi->s_qbmask) & uspi->s_bmask)
 253 #define ufs_fragroundup(size)   (((size) + uspi->s_qfmask) & uspi->s_fmask)
 254 #define ufs_fragstoblks(frags)  ((frags) >> uspi->s_fpbshift)
 255 #define ufs_blkstofrags(blks)   ((blks) << uspi->s_fpbshift)
 256 #define ufs_fragnum(fsb)        ((fsb) & uspi->s_fpbmask)
 257 #define ufs_blknum(fsb)         ((fsb) & ~uspi->s_fpbmask)
 258
 259 #define UFS_MAXNAMLEN 255
 260 #define UFS_MAXMNTLEN 512
 261 #define UFS2_MAXMNTLEN 468
 262 #define UFS2_MAXVOLLEN 32
 263 #define UFS_MAXCSBUFS 31
 264 #define UFS_LINK_MAX 32000
 265 /*
 266 #define UFS2_NOCSPTRS   ((128 / sizeof(void *)) - 4)
 267 */
 268 #define UFS2_NOCSPTRS   28
 269
 270 /*
 271  * UFS_DIR_PAD defines the directory entries boundaries
 272  * (must be a multiple of 4)
 273  */
 274 #define UFS_DIR_PAD                     4
 275 #define UFS_DIR_ROUND                   (UFS_DIR_PAD - 1)
 276 #define UFS_DIR_REC_LEN(name_len)       (((name_len) + 1 + 8 + UFS_DIR_ROUND) & ~UFS_DIR_ROUND)
 277
 278 struct ufs_timeval {
 279         __fs32  tv_sec;
 280         __fs32  tv_usec;
 281 };
 282
 283 struct ufs_dir_entry {
 284         __fs32  d_ino;                  /* inode number of this entry */
 285         __fs16  d_reclen;               /* length of this entry */
 286         union {
 287                 __fs16  d_namlen;               /* actual length of d_name */
 288                 struct {
 289                         __u8    d_type;         /* file type */
 290                         __u8    d_namlen;       /* length of string in d_name */
 291                 } d_44;
 292         } d_u;
 293         __u8    d_name[UFS_MAXNAMLEN + 1];      /* file name */
 294 };
 295
 296 struct ufs_csum {
 297         __fs32  cs_ndir;        /* number of directories */
 298         __fs32  cs_nbfree;      /* number of free blocks */
 299         __fs32  cs_nifree;      /* number of free inodes */
 300         __fs32  cs_nffree;      /* number of free frags */
 301 };
 302 struct ufs2_csum_total {
 303         __fs64  cs_ndir;        /* number of directories */
 304         __fs64  cs_nbfree;      /* number of free blocks */
 305         __fs64  cs_nifree;      /* number of free inodes */
 306         __fs64  cs_nffree;      /* number of free frags */
 307         __fs64   cs_numclusters;        /* number of free clusters */
 308         __fs64   cs_spare[3];   /* future expansion */
 309 };
 310
 311 struct ufs_csum_core {
 312         __u64   cs_ndir;        /* number of directories */
 313         __u64   cs_nbfree;      /* number of free blocks */
 314         __u64   cs_nifree;      /* number of free inodes */
 315         __u64   cs_nffree;      /* number of free frags */
 316         __u64   cs_numclusters; /* number of free clusters */
 317 };
 318
 319 /*
 320  * File system flags
 321  */
 322 #define UFS_UNCLEAN      0x01    /* file system not clean at mount (unused) */
 323 #define UFS_DOSOFTDEP    0x02    /* file system using soft dependencies */
 324 #define UFS_NEEDSFSCK    0x04    /* needs sync fsck (FreeBSD compat, unused) */
 325 #define UFS_INDEXDIRS    0x08    /* kernel supports indexed directories */
 326 #define UFS_ACLS         0x10    /* file system has ACLs enabled */
 327 #define UFS_MULTILABEL   0x20    /* file system is MAC multi-label */
 328 #define UFS_FLAGS_UPDATED 0x80   /* flags have been moved to new location */
 329
 330 #if 0
 331 /*
 332  * This is the actual superblock, as it is laid out on the disk.
 333  * Do NOT use this structure, because of sizeof(ufs_super_block) > 512 and
 334  * it may occupy several blocks, use
 335  * struct ufs_super_block_(first,second,third) instead.
 336  */
 337 struct ufs_super_block {
 338         union {
 339                 struct {
 340                         __fs32  fs_link;        /* UNUSED */
 341                 } fs_42;
 342                 struct {
 343                         __fs32  fs_state;       /* file system state flag */
 344                 } fs_sun;
 345         } fs_u0;
 346         __fs32  fs_rlink;       /* UNUSED */
 347         __fs32  fs_sblkno;      /* addr of super-block in filesys */
 348         __fs32  fs_cblkno;      /* offset of cyl-block in filesys */
 349         __fs32  fs_iblkno;      /* offset of inode-blocks in filesys */
 350         __fs32  fs_dblkno;      /* offset of first data after cg */
 351         __fs32  fs_cgoffset;    /* cylinder group offset in cylinder */
 352         __fs32  fs_cgmask;      /* used to calc mod fs_ntrak */
 353         __fs32  fs_time;        /* last time written -- time_t */
 354         __fs32  fs_size;        /* number of blocks in fs */
 355         __fs32  fs_dsize;       /* number of data blocks in fs */
 356         __fs32  fs_ncg;         /* number of cylinder groups */
 357         __fs32  fs_bsize;       /* size of basic blocks in fs */
 358         __fs32  fs_fsize;       /* size of frag blocks in fs */
 359         __fs32  fs_frag;        /* number of frags in a block in fs */
 360 /* these are configuration parameters */
 361         __fs32  fs_minfree;     /* minimum percentage of free blocks */
 362         __fs32  fs_rotdelay;    /* num of ms for optimal next block */
 363         __fs32  fs_rps;         /* disk revolutions per second */
 364 /* these fields can be computed from the others */
 365         __fs32  fs_bmask;       /* ``blkoff'' calc of blk offsets */
 366         __fs32  fs_fmask;       /* ``fragoff'' calc of frag offsets */
 367         __fs32  fs_bshift;      /* ``lblkno'' calc of logical blkno */
 368         __fs32  fs_fshift;      /* ``numfrags'' calc number of frags */
 369 /* these are configuration parameters */
 370         __fs32  fs_maxcontig;   /* max number of contiguous blks */
 371         __fs32  fs_maxbpg;      /* max number of blks per cyl group */
 372 /* these fields can be computed from the others */
 373         __fs32  fs_fragshift;   /* block to frag shift */
 374         __fs32  fs_fsbtodb;     /* fsbtodb and dbtofsb shift constant */
 375         __fs32  fs_sbsize;      /* actual size of super block */
 376         __fs32  fs_csmask;      /* csum block offset */
 377         __fs32  fs_csshift;     /* csum block number */
 378         __fs32  fs_nindir;      /* value of NINDIR */
 379         __fs32  fs_inopb;       /* value of INOPB */
 380         __fs32  fs_nspf;        /* value of NSPF */
 381 /* yet another configuration parameter */
 382         __fs32  fs_optim;       /* optimization preference, see below */
 383 /* these fields are derived from the hardware */
 384         union {
 385                 struct {
 386                         __fs32  fs_npsect;      /* # sectors/track including spares */
 387                 } fs_sun;
 388                 struct {
 389                         __fs32  fs_state;       /* file system state time stamp */
 390                 } fs_sunx86;
 391         } fs_u1;
 392         __fs32  fs_interleave;  /* hardware sector interleave */
 393         __fs32  fs_trackskew;   /* sector 0 skew, per track */
 394 /* a unique id for this filesystem (currently unused and unmaintained) */
 395 /* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */
 396 /* Neither of those fields is used in the Tahoe code right now but */
 397 /* there could be problems if they are.                            */
 398         __fs32  fs_id[2];       /* file system id */
 399 /* sizes determined by number of cylinder groups and their sizes */
 400         __fs32  fs_csaddr;      /* blk addr of cyl grp summary area */
 401         __fs32  fs_cssize;      /* size of cyl grp summary area */
 402         __fs32  fs_cgsize;      /* cylinder group size */
 403 /* these fields are derived from the hardware */
 404         __fs32  fs_ntrak;       /* tracks per cylinder */
 405         __fs32  fs_nsect;       /* sectors per track */
 406         __fs32  fs_spc;         /* sectors per cylinder */
 407 /* this comes from the disk driver partitioning */
 408         __fs32  fs_ncyl;        /* cylinders in file system */
 409 /* these fields can be computed from the others */
 410         __fs32  fs_cpg;         /* cylinders per group */
 411         __fs32  fs_ipg;         /* inodes per cylinder group */
 412         __fs32  fs_fpg;         /* blocks per group * fs_frag */
 413 /* this data must be re-computed after crashes */
 414         struct ufs_csum fs_cstotal;     /* cylinder summary information */
 415 /* these fields are cleared at mount time */
 416         __s8    fs_fmod;        /* super block modified flag */
 417         __s8    fs_clean;       /* file system is clean flag */
 418         __s8    fs_ronly;       /* mounted read-only flag */
 419         __s8    fs_flags;
 420         union {
 421                 struct {
 422                         __s8    fs_fsmnt[UFS_MAXMNTLEN];/* name mounted on */
 423                         __fs32  fs_cgrotor;     /* last cg searched */
 424                         __fs32  fs_csp[UFS_MAXCSBUFS];/*list of fs_cs info buffers */
 425                         __fs32  fs_maxcluster;
 426                         __fs32  fs_cpc;         /* cyl per cycle in postbl */
 427                         __fs16  fs_opostbl[16][8]; /* old rotation block list head */
 428                 } fs_u1;
 429                 struct {
 430                         __s8  fs_fsmnt[UFS2_MAXMNTLEN]; /* name mounted on */
 431                         __u8   fs_volname[UFS2_MAXVOLLEN]; /* volume name */
 432                         __fs64  fs_swuid;               /* system-wide uid */
 433                         __fs32  fs_pad; /* due to alignment of fs_swuid */
 434                         __fs32   fs_cgrotor;     /* last cg searched */
 435                         __fs32   fs_ocsp[UFS2_NOCSPTRS]; /*list of fs_cs info buffers */
 436                         __fs32   fs_contigdirs;/*# of contiguously allocated dirs */
 437                         __fs32   fs_csp;        /* cg summary info buffer for fs_cs */
 438                         __fs32   fs_maxcluster;
 439                         __fs32   fs_active;/* used by snapshots to track fs */
 440                         __fs32   fs_old_cpc;    /* cyl per cycle in postbl */
 441                         __fs32   fs_maxbsize;/*maximum blocking factor permitted */
 442                         __fs64   fs_sparecon64[17];/*old rotation block list head */
 443                         __fs64   fs_sblockloc; /* byte offset of standard superblock */
 444                         struct  ufs2_csum_total fs_cstotal;/*cylinder summary information*/
 445                         struct  ufs_timeval    fs_time;         /* last time written */
 446                         __fs64    fs_size;              /* number of blocks in fs */
 447                         __fs64    fs_dsize;     /* number of data blocks in fs */
 448                         __fs64   fs_csaddr;     /* blk addr of cyl grp summary area */
 449                         __fs64    fs_pendingblocks;/* blocks in process of being freed */
 450                         __fs32    fs_pendinginodes;/*inodes in process of being freed */
 451                 } fs_u2;
 452         }  fs_u11;
 453         union {
 454                 struct {
 455                         __fs32  fs_sparecon[53];/* reserved for future constants */
 456                         __fs32  fs_reclaim;
 457                         __fs32  fs_sparecon2[1];
 458                         __fs32  fs_state;       /* file system state time stamp */
 459                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 460                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 461                 } fs_sun;
 462                 struct {
 463                         __fs32  fs_sparecon[53];/* reserved for future constants */
 464                         __fs32  fs_reclaim;
 465                         __fs32  fs_sparecon2[1];
 466                         __fs32  fs_npsect;      /* # sectors/track including spares */
 467                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 468                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 469                 } fs_sunx86;
 470                 struct {
 471                         __fs32  fs_sparecon[50];/* reserved for future constants */
 472                         __fs32  fs_contigsumsize;/* size of cluster summary array */
 473                         __fs32  fs_maxsymlinklen;/* max length of an internal symlink */
 474                         __fs32  fs_inodefmt;    /* format of on-disk inodes */
 475                         __fs32  fs_maxfilesize[2];      /* max representable file size */
 476                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 477                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 478                         __fs32  fs_state;       /* file system state time stamp */
 479                 } fs_44;
 480         } fs_u2;
 481         __fs32  fs_postblformat;        /* format of positional layout tables */
 482         __fs32  fs_nrpos;               /* number of rotational positions */
 483         __fs32  fs_postbloff;           /* (__s16) rotation block list head */
 484         __fs32  fs_rotbloff;            /* (__u8) blocks for each rotation */
 485         __fs32  fs_magic;               /* magic number */
 486         __u8    fs_space[1];            /* list of blocks for each rotation */
 487 };
 488 #endif/*struct ufs_super_block*/
 489
 490 /*
 491  * Preference for optimization.
 492  */
 493 #define UFS_OPTTIME     0       /* minimize allocation time */
 494 #define UFS_OPTSPACE    1       /* minimize disk fragmentation */
 495
 496 /*
 497  * Rotational layout table format types
 498  */
 499 #define UFS_42POSTBLFMT         -1      /* 4.2BSD rotational table format */
 500 #define UFS_DYNAMICPOSTBLFMT    1       /* dynamic rotational table format */
 501
 502 /*
 503  * Convert cylinder group to base address of its global summary info.
 504  */
 505 #define fs_cs(indx) s_csp[(indx)]
 506
 507 /*
 508  * Cylinder group block for a file system.
 509  *
 510  * Writable fields in the cylinder group are protected by the associated
 511  * super block lock fs->fs_lock.
 512  */
 513 #define CG_MAGIC        0x090255
 514 #define ufs_cg_chkmagic(sb, ucg) \
 515         (fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)
 516 /*
 517  * Macros for access to old cylinder group array structures
 518  */
 519 #define ufs_ocg_blktot(sb, ucg)      fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_btot)
 520 #define ufs_ocg_blks(sb, ucg, cylno) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_b[cylno])
 521 #define ufs_ocg_inosused(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_iused)
 522 #define ufs_ocg_blksfree(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_free)
 523 #define ufs_ocg_chkmagic(sb, ucg) \
 524         (fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_magic) == CG_MAGIC)
 525
 526 /*
 527  * size of this structure is 172 B
 528  */
 529 struct  ufs_cylinder_group {
 530         __fs32  cg_link;                /* linked list of cyl groups */
 531         __fs32  cg_magic;               /* magic number */
 532         __fs32  cg_time;                /* time last written */
 533         __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */
 534         __fs16  cg_ncyl;                /* number of cyl's this cg */
 535         __fs16  cg_niblk;               /* number of inode blocks this cg */
 536         __fs32  cg_ndblk;               /* number of data blocks this cg */
 537         struct  ufs_csum cg_cs;         /* cylinder summary information */
 538         __fs32  cg_rotor;               /* position of last used block */
 539         __fs32  cg_frotor;              /* position of last used frag */
 540         __fs32  cg_irotor;              /* position of last used inode */
 541         __fs32  cg_frsum[UFS_MAXFRAG];  /* counts of available frags */
 542         __fs32  cg_btotoff;             /* (__u32) block totals per cylinder */
 543         __fs32  cg_boff;                /* (short) free block positions */
 544         __fs32  cg_iusedoff;            /* (char) used inode map */
 545         __fs32  cg_freeoff;             /* (u_char) free block map */
 546         __fs32  cg_nextfreeoff;         /* (u_char) next available space */
 547         union {
 548                 struct {
 549                         __fs32  cg_clustersumoff;       /* (u_int32) counts of avail clusters */
 550                         __fs32  cg_clusteroff;          /* (u_int8) free cluster map */
 551                         __fs32  cg_nclusterblks;        /* number of clusters this cg */
 552                         __fs32  cg_sparecon[13];        /* reserved for future use */
 553                 } cg_44;
 554                 struct {
 555                         __fs32  cg_clustersumoff;/* (u_int32) counts of avail clusters */
 556                         __fs32  cg_clusteroff;  /* (u_int8) free cluster map */
 557                         __fs32  cg_nclusterblks;/* number of clusters this cg */
 558                         __fs32   cg_niblk; /* number of inode blocks this cg */
 559                         __fs32   cg_initediblk; /* last initialized inode */
 560                         __fs32   cg_sparecon32[3];/* reserved for future use */
 561                         __fs64   cg_time;       /* time last written */
 562                         __fs64  cg_sparecon[3]; /* reserved for future use */
 563                 } cg_u2;
 564                 __fs32  cg_sparecon[16];        /* reserved for future use */
 565         } cg_u;
 566         __u8    cg_space[1];            /* space for cylinder group maps */
 567 /* actually longer */
 568 };
 569
 570 /* Historic Cylinder group info */
 571 struct ufs_old_cylinder_group {
 572         __fs32  cg_link;                /* linked list of cyl groups */
 573         __fs32  cg_rlink;               /* for incore cyl groups     */
 574         __fs32  cg_time;                /* time last written */
 575         __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */
 576         __fs16  cg_ncyl;                /* number of cyl's this cg */
 577         __fs16  cg_niblk;               /* number of inode blocks this cg */
 578         __fs32  cg_ndblk;               /* number of data blocks this cg */
 579         struct  ufs_csum cg_cs;         /* cylinder summary information */
 580         __fs32  cg_rotor;               /* position of last used block */
 581         __fs32  cg_frotor;              /* position of last used frag */
 582         __fs32  cg_irotor;              /* position of last used inode */
 583         __fs32  cg_frsum[8];            /* counts of available frags */
 584         __fs32  cg_btot[32];            /* block totals per cylinder */
 585         __fs16  cg_b[32][8];            /* positions of free blocks */
 586         __u8    cg_iused[256];          /* used inode map */
 587         __fs32  cg_magic;               /* magic number */
 588         __u8    cg_free[1];             /* free block map */
 589 /* actually longer */
 590 };
 591
 592 /*
 593  * structure of an on-disk inode
 594  */
 595 struct ufs_inode {
 596         __fs16  ui_mode;                /*  0x0 */
 597         __fs16  ui_nlink;               /*  0x2 */
 598         union {
 599                 struct {
 600                         __fs16  ui_suid;        /*  0x4 */
 601                         __fs16  ui_sgid;        /*  0x6 */
 602                 } oldids;
 603                 __fs32  ui_inumber;             /*  0x4 lsf: inode number */
 604                 __fs32  ui_author;              /*  0x4 GNU HURD: author */
 605         } ui_u1;
 606         __fs64  ui_size;                /*  0x8 */
 607         struct ufs_timeval ui_atime;    /* 0x10 access */
 608         struct ufs_timeval ui_mtime;    /* 0x18 modification */
 609         struct ufs_timeval ui_ctime;    /* 0x20 creation */
 610         union {
 611                 struct {
 612                         __fs32  ui_db[UFS_NDADDR];/* 0x28 data blocks */
 613                         __fs32  ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */
 614                 } ui_addr;
 615                 __u8    ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
 616         } ui_u2;
 617         __fs32  ui_flags;               /* 0x64 immutable, append-only... */
 618         __fs32  ui_blocks;              /* 0x68 blocks in use */
 619         __fs32  ui_gen;                 /* 0x6c like ext2 i_version, for NFS support */
 620         union {
 621                 struct {
 622                         __fs32  ui_shadow;      /* 0x70 shadow inode with security data */
 623                         __fs32  ui_uid;         /* 0x74 long EFT version of uid */
 624                         __fs32  ui_gid;         /* 0x78 long EFT version of gid */
 625                         __fs32  ui_oeftflag;    /* 0x7c reserved */
 626                 } ui_sun;
 627                 struct {
 628                         __fs32  ui_uid;         /* 0x70 File owner */
 629                         __fs32  ui_gid;         /* 0x74 File group */
 630                         __fs32  ui_spare[2];    /* 0x78 reserved */
 631                 } ui_44;
 632                 struct {
 633                         __fs32  ui_uid;         /* 0x70 */
 634                         __fs32  ui_gid;         /* 0x74 */
 635                         __fs16  ui_modeh;       /* 0x78 mode high bits */
 636                         __fs16  ui_spare;       /* 0x7A unused */
 637                         __fs32  ui_trans;       /* 0x7c filesystem translator */
 638                 } ui_hurd;
 639         } ui_u3;
 640 };
 641
 642 #define UFS_NXADDR  2            /* External addresses in inode. */
 643 struct ufs2_inode {
 644         __fs16     ui_mode;        /*   0: IFMT, permissions; see below. */
 645         __fs16     ui_nlink;       /*   2: File link count. */
 646         __fs32     ui_uid;         /*   4: File owner. */
 647         __fs32     ui_gid;         /*   8: File group. */
 648         __fs32     ui_blksize;     /*  12: Inode blocksize. */
 649         __fs64     ui_size;        /*  16: File byte count. */
 650         __fs64     ui_blocks;      /*  24: Bytes actually held. */
 651         __fs64   ui_atime;       /*  32: Last access time. */
 652         __fs64   ui_mtime;       /*  40: Last modified time. */
 653         __fs64   ui_ctime;       /*  48: Last inode change time. */
 654         __fs64   ui_birthtime;   /*  56: Inode creation time. */
 655         __fs32     ui_mtimensec;   /*  64: Last modified time. */
 656         __fs32     ui_atimensec;   /*  68: Last access time. */
 657         __fs32     ui_ctimensec;   /*  72: Last inode change time. */
 658         __fs32     ui_birthnsec;   /*  76: Inode creation time. */
 659         __fs32     ui_gen;         /*  80: Generation number. */
 660         __fs32     ui_kernflags;   /*  84: Kernel flags. */
 661         __fs32     ui_flags;       /*  88: Status flags (chflags). */
 662         __fs32     ui_extsize;     /*  92: External attributes block. */
 663         __fs64     ui_extb[UFS_NXADDR];/*  96: External attributes block. */
 664         union {
 665                 struct {
 666                         __fs64     ui_db[UFS_NDADDR]; /* 112: Direct disk blocks. */
 667                         __fs64     ui_ib[UFS_NINDIR];/* 208: Indirect disk blocks.*/
 668                 } ui_addr;
 669         __u8    ui_symlink[2*4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
 670         } ui_u2;
 671         __fs64     ui_spare[3];    /* 232: Reserved; currently unused */
 672 };
 673
 674
 675 /* FreeBSD has these in sys/stat.h */
 676 /* ui_flags that can be set by a file owner */
 677 #define UFS_UF_SETTABLE   0x0000ffff
 678 #define UFS_UF_NODUMP     0x00000001  /* do not dump */
 679 #define UFS_UF_IMMUTABLE  0x00000002  /* immutable (can't "change") */
 680 #define UFS_UF_APPEND     0x00000004  /* append-only */
 681 #define UFS_UF_OPAQUE     0x00000008  /* directory is opaque (unionfs) */
 682 #define UFS_UF_NOUNLINK   0x00000010  /* can't be removed or renamed */
 683 /* ui_flags that only root can set */
 684 #define UFS_SF_SETTABLE   0xffff0000
 685 #define UFS_SF_ARCHIVED   0x00010000  /* archived */
 686 #define UFS_SF_IMMUTABLE  0x00020000  /* immutable (can't "change") */
 687 #define UFS_SF_APPEND     0x00040000  /* append-only */
 688 #define UFS_SF_NOUNLINK   0x00100000  /* can't be removed or renamed */
 689
 690 /*
 691  * This structure is used for reading disk structures larger
 692  * than the size of fragment.
 693  */
 694 struct ufs_buffer_head {
 695         __u64 fragment;                 /* first fragment */
 696         __u64 count;                            /* number of fragments */
 697         struct buffer_head * bh[UFS_MAXFRAG];   /* buffers */
 698 };
 699
 700 struct ufs_cg_private_info {
 701         struct ufs_buffer_head c_ubh;
 702         __u32   c_cgx;          /* number of cylidner group */
 703         __u16   c_ncyl;         /* number of cyl's this cg */
 704         __u16   c_niblk;        /* number of inode blocks this cg */
 705         __u32   c_ndblk;        /* number of data blocks this cg */
 706         __u32   c_rotor;        /* position of last used block */
 707         __u32   c_frotor;       /* position of last used frag */
 708         __u32   c_irotor;       /* position of last used inode */
 709         __u32   c_btotoff;      /* (__u32) block totals per cylinder */
 710         __u32   c_boff;         /* (short) free block positions */
 711         __u32   c_iusedoff;     /* (char) used inode map */
 712         __u32   c_freeoff;      /* (u_char) free block map */
 713         __u32   c_nextfreeoff;  /* (u_char) next available space */
 714         __u32   c_clustersumoff;/* (u_int32) counts of avail clusters */
 715         __u32   c_clusteroff;   /* (u_int8) free cluster map */
 716         __u32   c_nclusterblks; /* number of clusters this cg */
 717 };
 718
 719
 720 struct ufs_sb_private_info {
 721         struct ufs_buffer_head s_ubh; /* buffer containing super block */
 722         struct ufs_csum_core cs_total;
 723         __u32   s_sblkno;       /* offset of super-blocks in filesys */
 724         __u32   s_cblkno;       /* offset of cg-block in filesys */
 725         __u32   s_iblkno;       /* offset of inode-blocks in filesys */
 726         __u32   s_dblkno;       /* offset of first data after cg */
 727         __u32   s_cgoffset;     /* cylinder group offset in cylinder */
 728         __u32   s_cgmask;       /* used to calc mod fs_ntrak */
 729         __u32   s_size;         /* number of blocks (fragments) in fs */
 730         __u32   s_dsize;        /* number of data blocks in fs */
 731         __u64   s_u2_size;      /* ufs2: number of blocks (fragments) in fs */
 732         __u64   s_u2_dsize;     /*ufs2:  number of data blocks in fs */
 733         __u32   s_ncg;          /* number of cylinder groups */
 734         __u32   s_bsize;        /* size of basic blocks */
 735         __u32   s_fsize;        /* size of fragments */
 736         __u32   s_fpb;          /* fragments per block */
 737         __u32   s_minfree;      /* minimum percentage of free blocks */
 738         __u32   s_bmask;        /* `blkoff'' calc of blk offsets */
 739         __u32   s_fmask;        /* s_fsize mask */
 740         __u32   s_bshift;       /* `lblkno'' calc of logical blkno */
 741         __u32   s_fshift;       /* s_fsize shift */
 742         __u32   s_fpbshift;     /* fragments per block shift */
 743         __u32   s_fsbtodb;      /* fsbtodb and dbtofsb shift constant */
 744         __u32   s_sbsize;       /* actual size of super block */
 745         __u32   s_csmask;       /* csum block offset */
 746         __u32   s_csshift;      /* csum block number */
 747         __u32   s_nindir;       /* value of NINDIR */
 748         __u32   s_inopb;        /* value of INOPB */
 749         __u32   s_nspf;         /* value of NSPF */
 750         __u32   s_npsect;       /* # sectors/track including spares */
 751         __u32   s_interleave;   /* hardware sector interleave */
 752         __u32   s_trackskew;    /* sector 0 skew, per track */
 753         __u64   s_csaddr;       /* blk addr of cyl grp summary area */
 754         __u32   s_cssize;       /* size of cyl grp summary area */
 755         __u32   s_cgsize;       /* cylinder group size */
 756         __u32   s_ntrak;        /* tracks per cylinder */
 757         __u32   s_nsect;        /* sectors per track */
 758         __u32   s_spc;          /* sectors per cylinder */
 759         __u32   s_ipg;          /* inodes per cylinder group */
 760         __u32   s_fpg;          /* fragments per group */
 761         __u32   s_cpc;          /* cyl per cycle in postbl */
 762         __s32   s_contigsumsize;/* size of cluster summary array, 44bsd */
 763         __s64   s_qbmask;       /* ~usb_bmask */
 764         __s64   s_qfmask;       /* ~usb_fmask */
 765         __s32   s_postblformat; /* format of positional layout tables */
 766         __s32   s_nrpos;        /* number of rotational positions */
 767         __s32   s_postbloff;    /* (__s16) rotation block list head */
 768         __s32   s_rotbloff;     /* (__u8) blocks for each rotation */
 769
 770         __u32   s_fpbmask;      /* fragments per block mask */
 771         __u32   s_apb;          /* address per block */
 772         __u32   s_2apb;         /* address per block^2 */
 773         __u32   s_3apb;         /* address per block^3 */
 774         __u32   s_apbmask;      /* address per block mask */
 775         __u32   s_apbshift;     /* address per block shift */
 776         __u32   s_2apbshift;    /* address per block shift * 2 */
 777         __u32   s_3apbshift;    /* address per block shift * 3 */
 778         __u32   s_nspfshift;    /* number of sector per fragment shift */
 779         __u32   s_nspb;         /* number of sector per block */
 780         __u32   s_inopf;        /* inodes per fragment */
 781         __u32   s_sbbase;       /* offset of NeXTstep superblock */
 782         __u32   s_bpf;          /* bits per fragment */
 783         __u32   s_bpfshift;     /* bits per fragment shift*/
 784         __u32   s_bpfmask;      /* bits per fragment mask */
 785
 786         __u32   s_maxsymlinklen;/* upper limit on fast symlinks' size */
 787         __s32   fs_magic;       /* filesystem magic */
 788         unsigned int s_dirblksize;
 789 };
 790
 791 /*
 792  * Sizes of this structures are:
 793  *      ufs_super_block_first   512
 794  *      ufs_super_block_second  512
 795  *      ufs_super_block_third   356
 796  */
 797 struct ufs_super_block_first {
 798         union {
 799                 struct {
 800                         __fs32  fs_link;        /* UNUSED */
 801                 } fs_42;
 802                 struct {
 803                         __fs32  fs_state;       /* file system state flag */
 804                 } fs_sun;
 805         } fs_u0;
 806         __fs32  fs_rlink;
 807         __fs32  fs_sblkno;
 808         __fs32  fs_cblkno;
 809         __fs32  fs_iblkno;
 810         __fs32  fs_dblkno;
 811         __fs32  fs_cgoffset;
 812         __fs32  fs_cgmask;
 813         __fs32  fs_time;
 814         __fs32  fs_size;
 815         __fs32  fs_dsize;
 816         __fs32  fs_ncg;
 817         __fs32  fs_bsize;
 818         __fs32  fs_fsize;
 819         __fs32  fs_frag;
 820         __fs32  fs_minfree;
 821         __fs32  fs_rotdelay;
 822         __fs32  fs_rps;
 823         __fs32  fs_bmask;
 824         __fs32  fs_fmask;
 825         __fs32  fs_bshift;
 826         __fs32  fs_fshift;
 827         __fs32  fs_maxcontig;
 828         __fs32  fs_maxbpg;
 829         __fs32  fs_fragshift;
 830         __fs32  fs_fsbtodb;
 831         __fs32  fs_sbsize;
 832         __fs32  fs_csmask;
 833         __fs32  fs_csshift;
 834         __fs32  fs_nindir;
 835         __fs32  fs_inopb;
 836         __fs32  fs_nspf;
 837         __fs32  fs_optim;
 838         union {
 839                 struct {
 840                         __fs32  fs_npsect;
 841                 } fs_sun;
 842                 struct {
 843                         __fs32  fs_state;
 844                 } fs_sunx86;
 845         } fs_u1;
 846         __fs32  fs_interleave;
 847         __fs32  fs_trackskew;
 848         __fs32  fs_id[2];
 849         __fs32  fs_csaddr;
 850         __fs32  fs_cssize;
 851         __fs32  fs_cgsize;
 852         __fs32  fs_ntrak;
 853         __fs32  fs_nsect;
 854         __fs32  fs_spc;
 855         __fs32  fs_ncyl;
 856         __fs32  fs_cpg;
 857         __fs32  fs_ipg;
 858         __fs32  fs_fpg;
 859         struct ufs_csum fs_cstotal;
 860         __s8    fs_fmod;
 861         __s8    fs_clean;
 862         __s8    fs_ronly;
 863         __s8    fs_flags;
 864         __s8    fs_fsmnt[UFS_MAXMNTLEN - 212];
 865
 866 };
 867
 868 struct ufs_super_block_second {
 869         union {
 870                 struct {
 871                         __s8    fs_fsmnt[212];
 872                         __fs32  fs_cgrotor;
 873                         __fs32  fs_csp[UFS_MAXCSBUFS];
 874                         __fs32  fs_maxcluster;
 875                         __fs32  fs_cpc;
 876                         __fs16  fs_opostbl[82];
 877                 } fs_u1;
 878                 struct {
 879                         __s8  fs_fsmnt[UFS2_MAXMNTLEN - UFS_MAXMNTLEN + 212];
 880                         __u8   fs_volname[UFS2_MAXVOLLEN];
 881                         __fs64  fs_swuid;
 882                         __fs32  fs_pad;
 883                         __fs32   fs_cgrotor;
 884                         __fs32   fs_ocsp[UFS2_NOCSPTRS];
 885                         __fs32   fs_contigdirs;
 886                         __fs32   fs_csp;
 887                         __fs32   fs_maxcluster;
 888                         __fs32   fs_active;
 889                         __fs32   fs_old_cpc;
 890                         __fs32   fs_maxbsize;
 891                         __fs64   fs_sparecon64[17];
 892                         __fs64   fs_sblockloc;
 893                         __fs64  cs_ndir;
 894                         __fs64  cs_nbfree;
 895                 } fs_u2;
 896         } fs_un;
 897 };
 898
 899 struct ufs_super_block_third {
 900         union {
 901                 struct {
 902                         __fs16  fs_opostbl[46];
 903                 } fs_u1;
 904                 struct {
 905                         __fs64  cs_nifree;      /* number of free inodes */
 906                         __fs64  cs_nffree;      /* number of free frags */
 907                         __fs64   cs_numclusters;        /* number of free clusters */
 908                         __fs64   cs_spare[3];   /* future expansion */
 909                         struct  ufs_timeval    fs_time;         /* last time written */
 910                         __fs64    fs_size;              /* number of blocks in fs */
 911                         __fs64    fs_dsize;     /* number of data blocks in fs */
 912                         __fs64   fs_csaddr;     /* blk addr of cyl grp summary area */
 913                         __fs64    fs_pendingblocks;/* blocks in process of being freed */
 914                         __fs32    fs_pendinginodes;/*inodes in process of being freed */
 915                 } __attribute__ ((packed)) fs_u2;
 916         } fs_un1;
 917         union {
 918                 struct {
 919                         __fs32  fs_sparecon[53];/* reserved for future constants */
 920                         __fs32  fs_reclaim;
 921                         __fs32  fs_sparecon2[1];
 922                         __fs32  fs_state;       /* file system state time stamp */
 923                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 924                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 925                 } fs_sun;
 926                 struct {
 927                         __fs32  fs_sparecon[53];/* reserved for future constants */
 928                         __fs32  fs_reclaim;
 929                         __fs32  fs_sparecon2[1];
 930                         __fs32  fs_npsect;      /* # sectors/track including spares */
 931                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 932                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 933                 } fs_sunx86;
 934                 struct {
 935                         __fs32  fs_sparecon[50];/* reserved for future constants */
 936                         __fs32  fs_contigsumsize;/* size of cluster summary array */
 937                         __fs32  fs_maxsymlinklen;/* max length of an internal symlink */
 938                         __fs32  fs_inodefmt;    /* format of on-disk inodes */
 939                         __fs32  fs_maxfilesize[2];      /* max representable file size */
 940                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 941                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 942                         __fs32  fs_state;       /* file system state time stamp */
 943                 } fs_44;
 944         } fs_un2;
 945         __fs32  fs_postblformat;
 946         __fs32  fs_nrpos;
 947         __fs32  fs_postbloff;
 948         __fs32  fs_rotbloff;
 949         __fs32  fs_magic;
 950         __u8    fs_space[1];
 951 };
 952
 953 #endif /* __LINUX_UFS_FS_H */