fs/ufs/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 #include <asm/div64.h>
  39 typedef __u64 __bitwise __fs64;
  40 typedef __u32 __bitwise __fs32;
  41 typedef __u16 __bitwise __fs16;
  42
  43 #define UFS_BBLOCK 0
  44 #define UFS_BBSIZE 8192
  45 #define UFS_SBLOCK 8192
  46 #define UFS_SBSIZE 8192
  47
  48 #define UFS_SECTOR_SIZE 512
  49 #define UFS_SECTOR_BITS 9
  50 #define UFS_MAGIC  0x00011954
  51 #define UFS_MAGIC_BW 0x0f242697
  52 #define UFS2_MAGIC 0x19540119
  53 #define UFS_CIGAM  0x54190100 /* byteswapped MAGIC */
  54
  55 /* Copied from FreeBSD */
  56 /*
  57  * Each disk drive contains some number of filesystems.
  58  * A filesystem consists of a number of cylinder groups.
  59  * Each cylinder group has inodes and data.
  60  *
  61  * A filesystem is described by its super-block, which in turn
  62  * describes the cylinder groups.  The super-block is critical
  63  * data and is replicated in each cylinder group to protect against
  64  * catastrophic loss.  This is done at `newfs' time and the critical
  65  * super-block data does not change, so the copies need not be
  66  * referenced further unless disaster strikes.
  67  *
  68  * For filesystem fs, the offsets of the various blocks of interest
  69  * are given in the super block as:
  70  *      [fs->fs_sblkno]         Super-block
  71  *      [fs->fs_cblkno]         Cylinder group block
  72  *      [fs->fs_iblkno]         Inode blocks
  73  *      [fs->fs_dblkno]         Data blocks
  74  * The beginning of cylinder group cg in fs, is given by
  75  * the ``cgbase(fs, cg)'' macro.
  76  *
  77  * Depending on the architecture and the media, the superblock may
  78  * reside in any one of four places. For tiny media where every block
  79  * counts, it is placed at the very front of the partition. Historically,
  80  * UFS1 placed it 8K from the front to leave room for the disk label and
  81  * a small bootstrap. For UFS2 it got moved to 64K from the front to leave
  82  * room for the disk label and a bigger bootstrap, and for really piggy
  83  * systems we check at 256K from the front if the first three fail. In
  84  * all cases the size of the superblock will be SBLOCKSIZE. All values are
  85  * given in byte-offset form, so they do not imply a sector size. The
  86  * SBLOCKSEARCH specifies the order in which the locations should be searched.
  87  */
  88 #define SBLOCK_FLOPPY        0
  89 #define SBLOCK_UFS1       8192
  90 #define SBLOCK_UFS2      65536
  91 #define SBLOCK_PIGGY    262144
  92 #define SBLOCKSIZE        8192
  93 #define SBLOCKSEARCH \
  94         { SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
  95
  96
  97 /* HP specific MAGIC values */
  98
  99 #define UFS_MAGIC_LFN   0x00095014 /* fs supports filenames > 14 chars */
 100 #define UFS_CIGAM_LFN   0x14500900 /* srahc 41 < semanelif stroppus sf */
 101
 102 #define UFS_MAGIC_SEC   0x00612195 /* B1 security fs */
 103 #define UFS_CIGAM_SEC   0x95216100
 104
 105 #define UFS_MAGIC_FEA   0x00195612 /* fs_featurebits supported */
 106 #define UFS_CIGAM_FEA   0x12561900
 107
 108 #define UFS_MAGIC_4GB   0x05231994 /* fs > 4 GB && fs_featurebits */
 109 #define UFS_CIGAM_4GB   0x94192305
 110
 111 /* Seems somebody at HP goofed here. B1 and lfs are both 0x2 !?! */
 112 #define UFS_FSF_LFN     0x00000001 /* long file names */
 113 #define UFS_FSF_B1      0x00000002 /* B1 security */
 114 #define UFS_FSF_LFS     0x00000002 /* large files */
 115 #define UFS_FSF_LUID    0x00000004 /* large UIDs */
 116
 117 /* End of HP stuff */
 118
 119
 120 #define UFS_BSIZE       8192
 121 #define UFS_MINBSIZE    4096
 122 #define UFS_FSIZE       1024
 123 #define UFS_MAXFRAG     (UFS_BSIZE / UFS_FSIZE)
 124
 125 #define UFS_NDADDR 12
 126 #define UFS_NINDIR 3
 127
 128 #define UFS_IND_BLOCK   (UFS_NDADDR + 0)
 129 #define UFS_DIND_BLOCK  (UFS_NDADDR + 1)
 130 #define UFS_TIND_BLOCK  (UFS_NDADDR + 2)
 131
 132 #define UFS_NDIR_FRAGMENT (UFS_NDADDR << uspi->s_fpbshift)
 133 #define UFS_IND_FRAGMENT (UFS_IND_BLOCK << uspi->s_fpbshift)
 134 #define UFS_DIND_FRAGMENT (UFS_DIND_BLOCK << uspi->s_fpbshift)
 135 #define UFS_TIND_FRAGMENT (UFS_TIND_BLOCK << uspi->s_fpbshift)
 136
 137 #define UFS_ROOTINO 2
 138 #define UFS_FIRST_INO (UFS_ROOTINO + 1)
 139
 140 #define UFS_USEEFT  ((__u16)65535)
 141
 142 /* fs_clean values */
 143 #define UFS_FSOK      0x7c269d38
 144 #define UFS_FSACTIVE  ((__s8)0x00)
 145 #define UFS_FSCLEAN   ((__s8)0x01)
 146 #define UFS_FSSTABLE  ((__s8)0x02)
 147 #define UFS_FSOSF1    ((__s8)0x03)      /* is this correct for DEC OSF/1? */
 148 #define UFS_FSBAD     ((__s8)0xff)
 149
 150 /* Solaris-specific fs_clean values */
 151 #define UFS_FSSUSPEND ((__s8)0xfe)      /* temporarily suspended */
 152 #define UFS_FSLOG     ((__s8)0xfd)      /* logging fs */
 153 #define UFS_FSFIX     ((__s8)0xfc)      /* being repaired while mounted */
 154
 155 /* From here to next blank line, s_flags for ufs_sb_info */
 156 /* directory entry encoding */
 157 #define UFS_DE_MASK             0x00000010      /* mask for the following */
 158 #define UFS_DE_OLD              0x00000000
 159 #define UFS_DE_44BSD            0x00000010
 160 /* uid encoding */
 161 #define UFS_UID_MASK            0x00000060      /* mask for the following */
 162 #define UFS_UID_OLD             0x00000000
 163 #define UFS_UID_44BSD           0x00000020
 164 #define UFS_UID_EFT             0x00000040
 165 /* superblock state encoding */
 166 #define UFS_ST_MASK             0x00000700      /* mask for the following */
 167 #define UFS_ST_OLD              0x00000000
 168 #define UFS_ST_44BSD            0x00000100
 169 #define UFS_ST_SUN              0x00000200 /* Solaris */
 170 #define UFS_ST_SUNOS            0x00000300
 171 #define UFS_ST_SUNx86           0x00000400 /* Solaris x86 */
 172 /*cylinder group encoding */
 173 #define UFS_CG_MASK             0x00003000      /* mask for the following */
 174 #define UFS_CG_OLD              0x00000000
 175 #define UFS_CG_44BSD            0x00002000
 176 #define UFS_CG_SUN              0x00001000
 177 /* filesystem type encoding */
 178 #define UFS_TYPE_MASK           0x00010000      /* mask for the following */
 179 #define UFS_TYPE_UFS1           0x00000000
 180 #define UFS_TYPE_UFS2           0x00010000
 181
 182
 183 /* fs_inodefmt options */
 184 #define UFS_42INODEFMT  -1
 185 #define UFS_44INODEFMT  2
 186
 187 /*
 188  * MINFREE gives the minimum acceptable percentage of file system
 189  * blocks which may be free. If the freelist drops below this level
 190  * only the superuser may continue to allocate blocks. This may
 191  * be set to 0 if no reserve of free blocks is deemed necessary,
 192  * however throughput drops by fifty percent if the file system
 193  * is run at between 95% and 100% full; thus the minimum default
 194  * value of fs_minfree is 5%. However, to get good clustering
 195  * performance, 10% is a better choice. hence we use 10% as our
 196  * default value. With 10% free space, fragmentation is not a
 197  * problem, so we choose to optimize for time.
 198  */
 199 #define UFS_MINFREE         5
 200 #define UFS_DEFAULTOPT      UFS_OPTTIME
 201
 202 /*
 203  * Turn file system block numbers into disk block addresses.
 204  * This maps file system blocks to device size blocks.
 205  */
 206 #define ufs_fsbtodb(uspi, b)    ((b) << (uspi)->s_fsbtodb)
 207 #define ufs_dbtofsb(uspi, b)    ((b) >> (uspi)->s_fsbtodb)
 208
 209 /*
 210  * Cylinder group macros to locate things in cylinder groups.
 211  * They calc file system addresses of cylinder group data structures.
 212  */
 213 #define ufs_cgbase(c)   (uspi->s_fpg * (c))
 214 #define ufs_cgstart(c)  ((uspi)->fs_magic == UFS2_MAGIC ?  ufs_cgbase(c) : \
 215         (ufs_cgbase(c)  + uspi->s_cgoffset * ((c) & ~uspi->s_cgmask)))
 216 #define ufs_cgsblock(c) (ufs_cgstart(c) + uspi->s_sblkno)       /* super blk */
 217 #define ufs_cgcmin(c)   (ufs_cgstart(c) + uspi->s_cblkno)       /* cg block */
 218 #define ufs_cgimin(c)   (ufs_cgstart(c) + uspi->s_iblkno)       /* inode blk */
 219 #define ufs_cgdmin(c)   (ufs_cgstart(c) + uspi->s_dblkno)       /* 1st data */
 220
 221 /*
 222  * Macros for handling inode numbers:
 223  *     inode number to file system block offset.
 224  *     inode number to cylinder group number.
 225  *     inode number to file system block address.
 226  */
 227 #define ufs_inotocg(x)          ((x) / uspi->s_ipg)
 228 #define ufs_inotocgoff(x)       ((x) % uspi->s_ipg)
 229 #define ufs_inotofsba(x)        (((u64)ufs_cgimin(ufs_inotocg(x))) + ufs_inotocgoff(x) / uspi->s_inopf)
 230 #define ufs_inotofsbo(x)        ((x) % uspi->s_inopf)
 231
 232 /*
 233  * Compute the cylinder and rotational position of a cyl block addr.
 234  */
 235 #define ufs_cbtocylno(bno) \
 236         ((bno) * uspi->s_nspf / uspi->s_spc)
 237 #define ufs_cbtorpos(bno)                                     \
 238         ((UFS_SB(sb)->s_flags & UFS_CG_SUN) ?                 \
 239          (((((bno) * uspi->s_nspf % uspi->s_spc) %            \
 240             uspi->s_nsect) *                                  \
 241            uspi->s_nrpos) / uspi->s_nsect)                    \
 242          :                                                    \
 243         ((((bno) * uspi->s_nspf % uspi->s_spc / uspi->s_nsect \
 244         * uspi->s_trackskew + (bno) * uspi->s_nspf % uspi->s_spc \
 245         % uspi->s_nsect * uspi->s_interleave) % uspi->s_nsect \
 246           * uspi->s_nrpos) / uspi->s_npsect))
 247
 248 /*
 249  * The following macros optimize certain frequently calculated
 250  * quantities by using shifts and masks in place of divisions
 251  * modulos and multiplications.
 252  */
 253 #define ufs_blkoff(loc)         ((loc) & uspi->s_qbmask)
 254 #define ufs_fragoff(loc)        ((loc) & uspi->s_qfmask)
 255 #define ufs_lblktosize(blk)     ((blk) << uspi->s_bshift)
 256 #define ufs_lblkno(loc)         ((loc) >> uspi->s_bshift)
 257 #define ufs_numfrags(loc)       ((loc) >> uspi->s_fshift)
 258 #define ufs_blkroundup(size)    (((size) + uspi->s_qbmask) & uspi->s_bmask)
 259 #define ufs_fragroundup(size)   (((size) + uspi->s_qfmask) & uspi->s_fmask)
 260 #define ufs_fragstoblks(frags)  ((frags) >> uspi->s_fpbshift)
 261 #define ufs_blkstofrags(blks)   ((blks) << uspi->s_fpbshift)
 262 #define ufs_fragnum(fsb)        ((fsb) & uspi->s_fpbmask)
 263 #define ufs_blknum(fsb)         ((fsb) & ~uspi->s_fpbmask)
 264
 265 #define UFS_MAXNAMLEN 255
 266 #define UFS_MAXMNTLEN 512
 267 #define UFS2_MAXMNTLEN 468
 268 #define UFS2_MAXVOLLEN 32
 269 #define UFS_MAXCSBUFS 31
 270 #define UFS_LINK_MAX 32000
 271 /*
 272 #define UFS2_NOCSPTRS   ((128 / sizeof(void *)) - 4)
 273 */
 274 #define UFS2_NOCSPTRS   28
 275
 276 /*
 277  * UFS_DIR_PAD defines the directory entries boundaries
 278  * (must be a multiple of 4)
 279  */
 280 #define UFS_DIR_PAD                     4
 281 #define UFS_DIR_ROUND                   (UFS_DIR_PAD - 1)
 282 #define UFS_DIR_REC_LEN(name_len)       (((name_len) + 1 + 8 + UFS_DIR_ROUND) & ~UFS_DIR_ROUND)
 283
 284 struct ufs_timeval {
 285         __fs32  tv_sec;
 286         __fs32  tv_usec;
 287 };
 288
 289 struct ufs_dir_entry {
 290         __fs32  d_ino;                  /* inode number of this entry */
 291         __fs16  d_reclen;               /* length of this entry */
 292         union {
 293                 __fs16  d_namlen;               /* actual length of d_name */
 294                 struct {
 295                         __u8    d_type;         /* file type */
 296                         __u8    d_namlen;       /* length of string in d_name */
 297                 } d_44;
 298         } d_u;
 299         __u8    d_name[UFS_MAXNAMLEN + 1];      /* file name */
 300 };
 301
 302 struct ufs_csum {
 303         __fs32  cs_ndir;        /* number of directories */
 304         __fs32  cs_nbfree;      /* number of free blocks */
 305         __fs32  cs_nifree;      /* number of free inodes */
 306         __fs32  cs_nffree;      /* number of free frags */
 307 };
 308 struct ufs2_csum_total {
 309         __fs64  cs_ndir;        /* number of directories */
 310         __fs64  cs_nbfree;      /* number of free blocks */
 311         __fs64  cs_nifree;      /* number of free inodes */
 312         __fs64  cs_nffree;      /* number of free frags */
 313         __fs64   cs_numclusters;        /* number of free clusters */
 314         __fs64   cs_spare[3];   /* future expansion */
 315 };
 316
 317 struct ufs_csum_core {
 318         __u64   cs_ndir;        /* number of directories */
 319         __u64   cs_nbfree;      /* number of free blocks */
 320         __u64   cs_nifree;      /* number of free inodes */
 321         __u64   cs_nffree;      /* number of free frags */
 322         __u64   cs_numclusters; /* number of free clusters */
 323 };
 324
 325 /*
 326  * File system flags
 327  */
 328 #define UFS_UNCLEAN      0x01    /* file system not clean at mount (unused) */
 329 #define UFS_DOSOFTDEP    0x02    /* file system using soft dependencies */
 330 #define UFS_NEEDSFSCK    0x04    /* needs sync fsck (FreeBSD compat, unused) */
 331 #define UFS_INDEXDIRS    0x08    /* kernel supports indexed directories */
 332 #define UFS_ACLS         0x10    /* file system has ACLs enabled */
 333 #define UFS_MULTILABEL   0x20    /* file system is MAC multi-label */
 334 #define UFS_FLAGS_UPDATED 0x80   /* flags have been moved to new location */
 335
 336 #if 0
 337 /*
 338  * This is the actual superblock, as it is laid out on the disk.
 339  * Do NOT use this structure, because of sizeof(ufs_super_block) > 512 and
 340  * it may occupy several blocks, use
 341  * struct ufs_super_block_(first,second,third) instead.
 342  */
 343 struct ufs_super_block {
 344         union {
 345                 struct {
 346                         __fs32  fs_link;        /* UNUSED */
 347                 } fs_42;
 348                 struct {
 349                         __fs32  fs_state;       /* file system state flag */
 350                 } fs_sun;
 351         } fs_u0;
 352         __fs32  fs_rlink;       /* UNUSED */
 353         __fs32  fs_sblkno;      /* addr of super-block in filesys */
 354         __fs32  fs_cblkno;      /* offset of cyl-block in filesys */
 355         __fs32  fs_iblkno;      /* offset of inode-blocks in filesys */
 356         __fs32  fs_dblkno;      /* offset of first data after cg */
 357         __fs32  fs_cgoffset;    /* cylinder group offset in cylinder */
 358         __fs32  fs_cgmask;      /* used to calc mod fs_ntrak */
 359         __fs32  fs_time;        /* last time written -- time_t */
 360         __fs32  fs_size;        /* number of blocks in fs */
 361         __fs32  fs_dsize;       /* number of data blocks in fs */
 362         __fs32  fs_ncg;         /* number of cylinder groups */
 363         __fs32  fs_bsize;       /* size of basic blocks in fs */
 364         __fs32  fs_fsize;       /* size of frag blocks in fs */
 365         __fs32  fs_frag;        /* number of frags in a block in fs */
 366 /* these are configuration parameters */
 367         __fs32  fs_minfree;     /* minimum percentage of free blocks */
 368         __fs32  fs_rotdelay;    /* num of ms for optimal next block */
 369         __fs32  fs_rps;         /* disk revolutions per second */
 370 /* these fields can be computed from the others */
 371         __fs32  fs_bmask;       /* ``blkoff'' calc of blk offsets */
 372         __fs32  fs_fmask;       /* ``fragoff'' calc of frag offsets */
 373         __fs32  fs_bshift;      /* ``lblkno'' calc of logical blkno */
 374         __fs32  fs_fshift;      /* ``numfrags'' calc number of frags */
 375 /* these are configuration parameters */
 376         __fs32  fs_maxcontig;   /* max number of contiguous blks */
 377         __fs32  fs_maxbpg;      /* max number of blks per cyl group */
 378 /* these fields can be computed from the others */
 379         __fs32  fs_fragshift;   /* block to frag shift */
 380         __fs32  fs_fsbtodb;     /* fsbtodb and dbtofsb shift constant */
 381         __fs32  fs_sbsize;      /* actual size of super block */
 382         __fs32  fs_csmask;      /* csum block offset */
 383         __fs32  fs_csshift;     /* csum block number */
 384         __fs32  fs_nindir;      /* value of NINDIR */
 385         __fs32  fs_inopb;       /* value of INOPB */
 386         __fs32  fs_nspf;        /* value of NSPF */
 387 /* yet another configuration parameter */
 388         __fs32  fs_optim;       /* optimization preference, see below */
 389 /* these fields are derived from the hardware */
 390         union {
 391                 struct {
 392                         __fs32  fs_npsect;      /* # sectors/track including spares */
 393                 } fs_sun;
 394                 struct {
 395                         __fs32  fs_state;       /* file system state time stamp */
 396                 } fs_sunx86;
 397         } fs_u1;
 398         __fs32  fs_interleave;  /* hardware sector interleave */
 399         __fs32  fs_trackskew;   /* sector 0 skew, per track */
 400 /* a unique id for this filesystem (currently unused and unmaintained) */
 401 /* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */
 402 /* Neither of those fields is used in the Tahoe code right now but */
 403 /* there could be problems if they are.                            */
 404         __fs32  fs_id[2];       /* file system id */
 405 /* sizes determined by number of cylinder groups and their sizes */
 406         __fs32  fs_csaddr;      /* blk addr of cyl grp summary area */
 407         __fs32  fs_cssize;      /* size of cyl grp summary area */
 408         __fs32  fs_cgsize;      /* cylinder group size */
 409 /* these fields are derived from the hardware */
 410         __fs32  fs_ntrak;       /* tracks per cylinder */
 411         __fs32  fs_nsect;       /* sectors per track */
 412         __fs32  fs_spc;         /* sectors per cylinder */
 413 /* this comes from the disk driver partitioning */
 414         __fs32  fs_ncyl;        /* cylinders in file system */
 415 /* these fields can be computed from the others */
 416         __fs32  fs_cpg;         /* cylinders per group */
 417         __fs32  fs_ipg;         /* inodes per cylinder group */
 418         __fs32  fs_fpg;         /* blocks per group * fs_frag */
 419 /* this data must be re-computed after crashes */
 420         struct ufs_csum fs_cstotal;     /* cylinder summary information */
 421 /* these fields are cleared at mount time */
 422         __s8    fs_fmod;        /* super block modified flag */
 423         __s8    fs_clean;       /* file system is clean flag */
 424         __s8    fs_ronly;       /* mounted read-only flag */
 425         __s8    fs_flags;
 426         union {
 427                 struct {
 428                         __s8    fs_fsmnt[UFS_MAXMNTLEN];/* name mounted on */
 429                         __fs32  fs_cgrotor;     /* last cg searched */
 430                         __fs32  fs_csp[UFS_MAXCSBUFS];/*list of fs_cs info buffers */
 431                         __fs32  fs_maxcluster;
 432                         __fs32  fs_cpc;         /* cyl per cycle in postbl */
 433                         __fs16  fs_opostbl[16][8]; /* old rotation block list head */
 434                 } fs_u1;
 435                 struct {
 436                         __s8  fs_fsmnt[UFS2_MAXMNTLEN]; /* name mounted on */
 437                         __u8   fs_volname[UFS2_MAXVOLLEN]; /* volume name */
 438                         __fs64  fs_swuid;               /* system-wide uid */
 439                         __fs32  fs_pad; /* due to alignment of fs_swuid */
 440                         __fs32   fs_cgrotor;     /* last cg searched */
 441                         __fs32   fs_ocsp[UFS2_NOCSPTRS]; /*list of fs_cs info buffers */
 442                         __fs32   fs_contigdirs;/*# of contiguously allocated dirs */
 443                         __fs32   fs_csp;        /* cg summary info buffer for fs_cs */
 444                         __fs32   fs_maxcluster;
 445                         __fs32   fs_active;/* used by snapshots to track fs */
 446                         __fs32   fs_old_cpc;    /* cyl per cycle in postbl */
 447                         __fs32   fs_maxbsize;/*maximum blocking factor permitted */
 448                         __fs64   fs_sparecon64[17];/*old rotation block list head */
 449                         __fs64   fs_sblockloc; /* byte offset of standard superblock */
 450                         struct  ufs2_csum_total fs_cstotal;/*cylinder summary information*/
 451                         struct  ufs_timeval    fs_time;         /* last time written */
 452                         __fs64    fs_size;              /* number of blocks in fs */
 453                         __fs64    fs_dsize;     /* number of data blocks in fs */
 454                         __fs64   fs_csaddr;     /* blk addr of cyl grp summary area */
 455                         __fs64    fs_pendingblocks;/* blocks in process of being freed */
 456                         __fs32    fs_pendinginodes;/*inodes in process of being freed */
 457                 } fs_u2;
 458         }  fs_u11;
 459         union {
 460                 struct {
 461                         __fs32  fs_sparecon[53];/* reserved for future constants */
 462                         __fs32  fs_reclaim;
 463                         __fs32  fs_sparecon2[1];
 464                         __fs32  fs_state;       /* file system state time stamp */
 465                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 466                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 467                 } fs_sun;
 468                 struct {
 469                         __fs32  fs_sparecon[53];/* reserved for future constants */
 470                         __fs32  fs_reclaim;
 471                         __fs32  fs_sparecon2[1];
 472                         __fs32  fs_npsect;      /* # sectors/track including spares */
 473                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 474                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 475                 } fs_sunx86;
 476                 struct {
 477                         __fs32  fs_sparecon[50];/* reserved for future constants */
 478                         __fs32  fs_contigsumsize;/* size of cluster summary array */
 479                         __fs32  fs_maxsymlinklen;/* max length of an internal symlink */
 480                         __fs32  fs_inodefmt;    /* format of on-disk inodes */
 481                         __fs32  fs_maxfilesize[2];      /* max representable file size */
 482                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 483                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 484                         __fs32  fs_state;       /* file system state time stamp */
 485                 } fs_44;
 486         } fs_u2;
 487         __fs32  fs_postblformat;        /* format of positional layout tables */
 488         __fs32  fs_nrpos;               /* number of rotational positions */
 489         __fs32  fs_postbloff;           /* (__s16) rotation block list head */
 490         __fs32  fs_rotbloff;            /* (__u8) blocks for each rotation */
 491         __fs32  fs_magic;               /* magic number */
 492         __u8    fs_space[1];            /* list of blocks for each rotation */
 493 };
 494 #endif/*struct ufs_super_block*/
 495
 496 /*
 497  * Preference for optimization.
 498  */
 499 #define UFS_OPTTIME     0       /* minimize allocation time */
 500 #define UFS_OPTSPACE    1       /* minimize disk fragmentation */
 501
 502 /*
 503  * Rotational layout table format types
 504  */
 505 #define UFS_42POSTBLFMT         -1      /* 4.2BSD rotational table format */
 506 #define UFS_DYNAMICPOSTBLFMT    1       /* dynamic rotational table format */
 507
 508 /*
 509  * Convert cylinder group to base address of its global summary info.
 510  */
 511 #define fs_cs(indx) s_csp[(indx)]
 512
 513 /*
 514  * Cylinder group block for a file system.
 515  *
 516  * Writable fields in the cylinder group are protected by the associated
 517  * super block lock fs->fs_lock.
 518  */
 519 #define CG_MAGIC        0x090255
 520 #define ufs_cg_chkmagic(sb, ucg) \
 521         (fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC)
 522 /*
 523  * Macros for access to old cylinder group array structures
 524  */
 525 #define ufs_ocg_blktot(sb, ucg)      fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_btot)
 526 #define ufs_ocg_blks(sb, ucg, cylno) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_b[cylno])
 527 #define ufs_ocg_inosused(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_iused)
 528 #define ufs_ocg_blksfree(sb, ucg)    fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_free)
 529 #define ufs_ocg_chkmagic(sb, ucg) \
 530         (fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_magic) == CG_MAGIC)
 531
 532 /*
 533  * size of this structure is 172 B
 534  */
 535 struct  ufs_cylinder_group {
 536         __fs32  cg_link;                /* linked list of cyl groups */
 537         __fs32  cg_magic;               /* magic number */
 538         __fs32  cg_time;                /* time last written */
 539         __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */
 540         __fs16  cg_ncyl;                /* number of cyl's this cg */
 541         __fs16  cg_niblk;               /* number of inode blocks this cg */
 542         __fs32  cg_ndblk;               /* number of data blocks this cg */
 543         struct  ufs_csum cg_cs;         /* cylinder summary information */
 544         __fs32  cg_rotor;               /* position of last used block */
 545         __fs32  cg_frotor;              /* position of last used frag */
 546         __fs32  cg_irotor;              /* position of last used inode */
 547         __fs32  cg_frsum[UFS_MAXFRAG];  /* counts of available frags */
 548         __fs32  cg_btotoff;             /* (__u32) block totals per cylinder */
 549         __fs32  cg_boff;                /* (short) free block positions */
 550         __fs32  cg_iusedoff;            /* (char) used inode map */
 551         __fs32  cg_freeoff;             /* (u_char) free block map */
 552         __fs32  cg_nextfreeoff;         /* (u_char) next available space */
 553         union {
 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_sparecon[13];        /* reserved for future use */
 559                 } cg_44;
 560                 struct {
 561                         __fs32  cg_clustersumoff;/* (u_int32) counts of avail clusters */
 562                         __fs32  cg_clusteroff;  /* (u_int8) free cluster map */
 563                         __fs32  cg_nclusterblks;/* number of clusters this cg */
 564                         __fs32   cg_niblk; /* number of inode blocks this cg */
 565                         __fs32   cg_initediblk; /* last initialized inode */
 566                         __fs32   cg_sparecon32[3];/* reserved for future use */
 567                         __fs64   cg_time;       /* time last written */
 568                         __fs64  cg_sparecon[3]; /* reserved for future use */
 569                 } cg_u2;
 570                 __fs32  cg_sparecon[16];        /* reserved for future use */
 571         } cg_u;
 572         __u8    cg_space[1];            /* space for cylinder group maps */
 573 /* actually longer */
 574 };
 575
 576 /* Historic Cylinder group info */
 577 struct ufs_old_cylinder_group {
 578         __fs32  cg_link;                /* linked list of cyl groups */
 579         __fs32  cg_rlink;               /* for incore cyl groups     */
 580         __fs32  cg_time;                /* time last written */
 581         __fs32  cg_cgx;                 /* we are the cgx'th cylinder group */
 582         __fs16  cg_ncyl;                /* number of cyl's this cg */
 583         __fs16  cg_niblk;               /* number of inode blocks this cg */
 584         __fs32  cg_ndblk;               /* number of data blocks this cg */
 585         struct  ufs_csum cg_cs;         /* cylinder summary information */
 586         __fs32  cg_rotor;               /* position of last used block */
 587         __fs32  cg_frotor;              /* position of last used frag */
 588         __fs32  cg_irotor;              /* position of last used inode */
 589         __fs32  cg_frsum[8];            /* counts of available frags */
 590         __fs32  cg_btot[32];            /* block totals per cylinder */
 591         __fs16  cg_b[32][8];            /* positions of free blocks */
 592         __u8    cg_iused[256];          /* used inode map */
 593         __fs32  cg_magic;               /* magic number */
 594         __u8    cg_free[1];             /* free block map */
 595 /* actually longer */
 596 };
 597
 598 /*
 599  * structure of an on-disk inode
 600  */
 601 struct ufs_inode {
 602         __fs16  ui_mode;                /*  0x0 */
 603         __fs16  ui_nlink;               /*  0x2 */
 604         union {
 605                 struct {
 606                         __fs16  ui_suid;        /*  0x4 */
 607                         __fs16  ui_sgid;        /*  0x6 */
 608                 } oldids;
 609                 __fs32  ui_inumber;             /*  0x4 lsf: inode number */
 610                 __fs32  ui_author;              /*  0x4 GNU HURD: author */
 611         } ui_u1;
 612         __fs64  ui_size;                /*  0x8 */
 613         struct ufs_timeval ui_atime;    /* 0x10 access */
 614         struct ufs_timeval ui_mtime;    /* 0x18 modification */
 615         struct ufs_timeval ui_ctime;    /* 0x20 creation */
 616         union {
 617                 struct {
 618                         __fs32  ui_db[UFS_NDADDR];/* 0x28 data blocks */
 619                         __fs32  ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */
 620                 } ui_addr;
 621                 __u8    ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
 622         } ui_u2;
 623         __fs32  ui_flags;               /* 0x64 immutable, append-only... */
 624         __fs32  ui_blocks;              /* 0x68 blocks in use */
 625         __fs32  ui_gen;                 /* 0x6c like ext2 i_version, for NFS support */
 626         union {
 627                 struct {
 628                         __fs32  ui_shadow;      /* 0x70 shadow inode with security data */
 629                         __fs32  ui_uid;         /* 0x74 long EFT version of uid */
 630                         __fs32  ui_gid;         /* 0x78 long EFT version of gid */
 631                         __fs32  ui_oeftflag;    /* 0x7c reserved */
 632                 } ui_sun;
 633                 struct {
 634                         __fs32  ui_uid;         /* 0x70 File owner */
 635                         __fs32  ui_gid;         /* 0x74 File group */
 636                         __fs32  ui_spare[2];    /* 0x78 reserved */
 637                 } ui_44;
 638                 struct {
 639                         __fs32  ui_uid;         /* 0x70 */
 640                         __fs32  ui_gid;         /* 0x74 */
 641                         __fs16  ui_modeh;       /* 0x78 mode high bits */
 642                         __fs16  ui_spare;       /* 0x7A unused */
 643                         __fs32  ui_trans;       /* 0x7c filesystem translator */
 644                 } ui_hurd;
 645         } ui_u3;
 646 };
 647
 648 #define UFS_NXADDR  2            /* External addresses in inode. */
 649 struct ufs2_inode {
 650         __fs16     ui_mode;        /*   0: IFMT, permissions; see below. */
 651         __fs16     ui_nlink;       /*   2: File link count. */
 652         __fs32     ui_uid;         /*   4: File owner. */
 653         __fs32     ui_gid;         /*   8: File group. */
 654         __fs32     ui_blksize;     /*  12: Inode blocksize. */
 655         __fs64     ui_size;        /*  16: File byte count. */
 656         __fs64     ui_blocks;      /*  24: Bytes actually held. */
 657         __fs64   ui_atime;       /*  32: Last access time. */
 658         __fs64   ui_mtime;       /*  40: Last modified time. */
 659         __fs64   ui_ctime;       /*  48: Last inode change time. */
 660         __fs64   ui_birthtime;   /*  56: Inode creation time. */
 661         __fs32     ui_mtimensec;   /*  64: Last modified time. */
 662         __fs32     ui_atimensec;   /*  68: Last access time. */
 663         __fs32     ui_ctimensec;   /*  72: Last inode change time. */
 664         __fs32     ui_birthnsec;   /*  76: Inode creation time. */
 665         __fs32     ui_gen;         /*  80: Generation number. */
 666         __fs32     ui_kernflags;   /*  84: Kernel flags. */
 667         __fs32     ui_flags;       /*  88: Status flags (chflags). */
 668         __fs32     ui_extsize;     /*  92: External attributes block. */
 669         __fs64     ui_extb[UFS_NXADDR];/*  96: External attributes block. */
 670         union {
 671                 struct {
 672                         __fs64     ui_db[UFS_NDADDR]; /* 112: Direct disk blocks. */
 673                         __fs64     ui_ib[UFS_NINDIR];/* 208: Indirect disk blocks.*/
 674                 } ui_addr;
 675         __u8    ui_symlink[2*4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
 676         } ui_u2;
 677         __fs64     ui_spare[3];    /* 232: Reserved; currently unused */
 678 };
 679
 680
 681 /* FreeBSD has these in sys/stat.h */
 682 /* ui_flags that can be set by a file owner */
 683 #define UFS_UF_SETTABLE   0x0000ffff
 684 #define UFS_UF_NODUMP     0x00000001  /* do not dump */
 685 #define UFS_UF_IMMUTABLE  0x00000002  /* immutable (can't "change") */
 686 #define UFS_UF_APPEND     0x00000004  /* append-only */
 687 #define UFS_UF_OPAQUE     0x00000008  /* directory is opaque (unionfs) */
 688 #define UFS_UF_NOUNLINK   0x00000010  /* can't be removed or renamed */
 689 /* ui_flags that only root can set */
 690 #define UFS_SF_SETTABLE   0xffff0000
 691 #define UFS_SF_ARCHIVED   0x00010000  /* archived */
 692 #define UFS_SF_IMMUTABLE  0x00020000  /* immutable (can't "change") */
 693 #define UFS_SF_APPEND     0x00040000  /* append-only */
 694 #define UFS_SF_NOUNLINK   0x00100000  /* can't be removed or renamed */
 695
 696 /*
 697  * This structure is used for reading disk structures larger
 698  * than the size of fragment.
 699  */
 700 struct ufs_buffer_head {
 701         __u64 fragment;                 /* first fragment */
 702         __u64 count;                            /* number of fragments */
 703         struct buffer_head * bh[UFS_MAXFRAG];   /* buffers */
 704 };
 705
 706 struct ufs_cg_private_info {
 707         struct ufs_buffer_head c_ubh;
 708         __u32   c_cgx;          /* number of cylidner group */
 709         __u16   c_ncyl;         /* number of cyl's this cg */
 710         __u16   c_niblk;        /* number of inode blocks this cg */
 711         __u32   c_ndblk;        /* number of data blocks this cg */
 712         __u32   c_rotor;        /* position of last used block */
 713         __u32   c_frotor;       /* position of last used frag */
 714         __u32   c_irotor;       /* position of last used inode */
 715         __u32   c_btotoff;      /* (__u32) block totals per cylinder */
 716         __u32   c_boff;         /* (short) free block positions */
 717         __u32   c_iusedoff;     /* (char) used inode map */
 718         __u32   c_freeoff;      /* (u_char) free block map */
 719         __u32   c_nextfreeoff;  /* (u_char) next available space */
 720         __u32   c_clustersumoff;/* (u_int32) counts of avail clusters */
 721         __u32   c_clusteroff;   /* (u_int8) free cluster map */
 722         __u32   c_nclusterblks; /* number of clusters this cg */
 723 };
 724
 725
 726 struct ufs_sb_private_info {
 727         struct ufs_buffer_head s_ubh; /* buffer containing super block */
 728         struct ufs_csum_core cs_total;
 729         __u32   s_sblkno;       /* offset of super-blocks in filesys */
 730         __u32   s_cblkno;       /* offset of cg-block in filesys */
 731         __u32   s_iblkno;       /* offset of inode-blocks in filesys */
 732         __u32   s_dblkno;       /* offset of first data after cg */
 733         __u32   s_cgoffset;     /* cylinder group offset in cylinder */
 734         __u32   s_cgmask;       /* used to calc mod fs_ntrak */
 735         __u32   s_size;         /* number of blocks (fragments) in fs */
 736         __u32   s_dsize;        /* number of data blocks in fs */
 737         __u64   s_u2_size;      /* ufs2: number of blocks (fragments) in fs */
 738         __u64   s_u2_dsize;     /*ufs2:  number of data blocks in fs */
 739         __u32   s_ncg;          /* number of cylinder groups */
 740         __u32   s_bsize;        /* size of basic blocks */
 741         __u32   s_fsize;        /* size of fragments */
 742         __u32   s_fpb;          /* fragments per block */
 743         __u32   s_minfree;      /* minimum percentage of free blocks */
 744         __u32   s_bmask;        /* `blkoff'' calc of blk offsets */
 745         __u32   s_fmask;        /* s_fsize mask */
 746         __u32   s_bshift;       /* `lblkno'' calc of logical blkno */
 747         __u32   s_fshift;       /* s_fsize shift */
 748         __u32   s_fpbshift;     /* fragments per block shift */
 749         __u32   s_fsbtodb;      /* fsbtodb and dbtofsb shift constant */
 750         __u32   s_sbsize;       /* actual size of super block */
 751         __u32   s_csmask;       /* csum block offset */
 752         __u32   s_csshift;      /* csum block number */
 753         __u32   s_nindir;       /* value of NINDIR */
 754         __u32   s_inopb;        /* value of INOPB */
 755         __u32   s_nspf;         /* value of NSPF */
 756         __u32   s_npsect;       /* # sectors/track including spares */
 757         __u32   s_interleave;   /* hardware sector interleave */
 758         __u32   s_trackskew;    /* sector 0 skew, per track */
 759         __u64   s_csaddr;       /* blk addr of cyl grp summary area */
 760         __u32   s_cssize;       /* size of cyl grp summary area */
 761         __u32   s_cgsize;       /* cylinder group size */
 762         __u32   s_ntrak;        /* tracks per cylinder */
 763         __u32   s_nsect;        /* sectors per track */
 764         __u32   s_spc;          /* sectors per cylinder */
 765         __u32   s_ipg;          /* inodes per cylinder group */
 766         __u32   s_fpg;          /* fragments per group */
 767         __u32   s_cpc;          /* cyl per cycle in postbl */
 768         __s32   s_contigsumsize;/* size of cluster summary array, 44bsd */
 769         __s64   s_qbmask;       /* ~usb_bmask */
 770         __s64   s_qfmask;       /* ~usb_fmask */
 771         __s32   s_postblformat; /* format of positional layout tables */
 772         __s32   s_nrpos;        /* number of rotational positions */
 773         __s32   s_postbloff;    /* (__s16) rotation block list head */
 774         __s32   s_rotbloff;     /* (__u8) blocks for each rotation */
 775
 776         __u32   s_fpbmask;      /* fragments per block mask */
 777         __u32   s_apb;          /* address per block */
 778         __u32   s_2apb;         /* address per block^2 */
 779         __u32   s_3apb;         /* address per block^3 */
 780         __u32   s_apbmask;      /* address per block mask */
 781         __u32   s_apbshift;     /* address per block shift */
 782         __u32   s_2apbshift;    /* address per block shift * 2 */
 783         __u32   s_3apbshift;    /* address per block shift * 3 */
 784         __u32   s_nspfshift;    /* number of sector per fragment shift */
 785         __u32   s_nspb;         /* number of sector per block */
 786         __u32   s_inopf;        /* inodes per fragment */
 787         __u32   s_sbbase;       /* offset of NeXTstep superblock */
 788         __u32   s_bpf;          /* bits per fragment */
 789         __u32   s_bpfshift;     /* bits per fragment shift*/
 790         __u32   s_bpfmask;      /* bits per fragment mask */
 791
 792         __u32   s_maxsymlinklen;/* upper limit on fast symlinks' size */
 793         __s32   fs_magic;       /* filesystem magic */
 794         unsigned int s_dirblksize;
 795 };
 796
 797 /*
 798  * Sizes of this structures are:
 799  *      ufs_super_block_first   512
 800  *      ufs_super_block_second  512
 801  *      ufs_super_block_third   356
 802  */
 803 struct ufs_super_block_first {
 804         union {
 805                 struct {
 806                         __fs32  fs_link;        /* UNUSED */
 807                 } fs_42;
 808                 struct {
 809                         __fs32  fs_state;       /* file system state flag */
 810                 } fs_sun;
 811         } fs_u0;
 812         __fs32  fs_rlink;
 813         __fs32  fs_sblkno;
 814         __fs32  fs_cblkno;
 815         __fs32  fs_iblkno;
 816         __fs32  fs_dblkno;
 817         __fs32  fs_cgoffset;
 818         __fs32  fs_cgmask;
 819         __fs32  fs_time;
 820         __fs32  fs_size;
 821         __fs32  fs_dsize;
 822         __fs32  fs_ncg;
 823         __fs32  fs_bsize;
 824         __fs32  fs_fsize;
 825         __fs32  fs_frag;
 826         __fs32  fs_minfree;
 827         __fs32  fs_rotdelay;
 828         __fs32  fs_rps;
 829         __fs32  fs_bmask;
 830         __fs32  fs_fmask;
 831         __fs32  fs_bshift;
 832         __fs32  fs_fshift;
 833         __fs32  fs_maxcontig;
 834         __fs32  fs_maxbpg;
 835         __fs32  fs_fragshift;
 836         __fs32  fs_fsbtodb;
 837         __fs32  fs_sbsize;
 838         __fs32  fs_csmask;
 839         __fs32  fs_csshift;
 840         __fs32  fs_nindir;
 841         __fs32  fs_inopb;
 842         __fs32  fs_nspf;
 843         __fs32  fs_optim;
 844         union {
 845                 struct {
 846                         __fs32  fs_npsect;
 847                 } fs_sun;
 848                 struct {
 849                         __fs32  fs_state;
 850                 } fs_sunx86;
 851         } fs_u1;
 852         __fs32  fs_interleave;
 853         __fs32  fs_trackskew;
 854         __fs32  fs_id[2];
 855         __fs32  fs_csaddr;
 856         __fs32  fs_cssize;
 857         __fs32  fs_cgsize;
 858         __fs32  fs_ntrak;
 859         __fs32  fs_nsect;
 860         __fs32  fs_spc;
 861         __fs32  fs_ncyl;
 862         __fs32  fs_cpg;
 863         __fs32  fs_ipg;
 864         __fs32  fs_fpg;
 865         struct ufs_csum fs_cstotal;
 866         __s8    fs_fmod;
 867         __s8    fs_clean;
 868         __s8    fs_ronly;
 869         __s8    fs_flags;
 870         __s8    fs_fsmnt[UFS_MAXMNTLEN - 212];
 871
 872 };
 873
 874 struct ufs_super_block_second {
 875         union {
 876                 struct {
 877                         __s8    fs_fsmnt[212];
 878                         __fs32  fs_cgrotor;
 879                         __fs32  fs_csp[UFS_MAXCSBUFS];
 880                         __fs32  fs_maxcluster;
 881                         __fs32  fs_cpc;
 882                         __fs16  fs_opostbl[82];
 883                 } fs_u1;
 884                 struct {
 885                         __s8  fs_fsmnt[UFS2_MAXMNTLEN - UFS_MAXMNTLEN + 212];
 886                         __u8   fs_volname[UFS2_MAXVOLLEN];
 887                         __fs64  fs_swuid;
 888                         __fs32  fs_pad;
 889                         __fs32   fs_cgrotor;
 890                         __fs32   fs_ocsp[UFS2_NOCSPTRS];
 891                         __fs32   fs_contigdirs;
 892                         __fs32   fs_csp;
 893                         __fs32   fs_maxcluster;
 894                         __fs32   fs_active;
 895                         __fs32   fs_old_cpc;
 896                         __fs32   fs_maxbsize;
 897                         __fs64   fs_sparecon64[17];
 898                         __fs64   fs_sblockloc;
 899                         __fs64  cs_ndir;
 900                         __fs64  cs_nbfree;
 901                 } fs_u2;
 902         } fs_un;
 903 };
 904
 905 struct ufs_super_block_third {
 906         union {
 907                 struct {
 908                         __fs16  fs_opostbl[46];
 909                 } fs_u1;
 910                 struct {
 911                         __fs64  cs_nifree;      /* number of free inodes */
 912                         __fs64  cs_nffree;      /* number of free frags */
 913                         __fs64   cs_numclusters;        /* number of free clusters */
 914                         __fs64   cs_spare[3];   /* future expansion */
 915                         struct  ufs_timeval    fs_time;         /* last time written */
 916                         __fs64    fs_size;              /* number of blocks in fs */
 917                         __fs64    fs_dsize;     /* number of data blocks in fs */
 918                         __fs64   fs_csaddr;     /* blk addr of cyl grp summary area */
 919                         __fs64    fs_pendingblocks;/* blocks in process of being freed */
 920                         __fs32    fs_pendinginodes;/*inodes in process of being freed */
 921                 } __attribute__ ((packed)) fs_u2;
 922         } fs_un1;
 923         union {
 924                 struct {
 925                         __fs32  fs_sparecon[53];/* reserved for future constants */
 926                         __fs32  fs_reclaim;
 927                         __fs32  fs_sparecon2[1];
 928                         __fs32  fs_state;       /* file system state time stamp */
 929                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 930                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 931                 } fs_sun;
 932                 struct {
 933                         __fs32  fs_sparecon[53];/* reserved for future constants */
 934                         __fs32  fs_reclaim;
 935                         __fs32  fs_sparecon2[1];
 936                         __fs32  fs_npsect;      /* # sectors/track including spares */
 937                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 938                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 939                 } fs_sunx86;
 940                 struct {
 941                         __fs32  fs_sparecon[50];/* reserved for future constants */
 942                         __fs32  fs_contigsumsize;/* size of cluster summary array */
 943                         __fs32  fs_maxsymlinklen;/* max length of an internal symlink */
 944                         __fs32  fs_inodefmt;    /* format of on-disk inodes */
 945                         __fs32  fs_maxfilesize[2];      /* max representable file size */
 946                         __fs32  fs_qbmask[2];   /* ~usb_bmask */
 947                         __fs32  fs_qfmask[2];   /* ~usb_fmask */
 948                         __fs32  fs_state;       /* file system state time stamp */
 949                 } fs_44;
 950         } fs_un2;
 951         __fs32  fs_postblformat;
 952         __fs32  fs_nrpos;
 953         __fs32  fs_postbloff;
 954         __fs32  fs_rotbloff;
 955         __fs32  fs_magic;
 956         __u8    fs_space[1];
 957 };
 958
 959 #endif /* __LINUX_UFS_FS_H */