/* SPDX-License-Identifier: GPL-2.0 */ /* * linux/include/linux/ufs_fs.h * * Copyright (C) 1996 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu) * Laboratory for Computer Science Research Computing Facility * Rutgers, The State University of New Jersey * * Clean swab support by Fare <fare@tunes.org> * just hope no one is using NNUUXXI on __?64 structure elements * 64-bit clean thanks to Maciej W. Rozycki <macro@ds2.pg.gda.pl> * * 4.4BSD (FreeBSD) support added on February 1st 1998 by * Niels Kristian Bech Jensen <nkbj@image.dk> partially based * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>. * * NeXTstep support added on February 5th 1998 by * Niels Kristian Bech Jensen <nkbj@image.dk>. * * Write support by Daniel Pirkl <daniel.pirkl@email.cz> * * HP/UX hfs filesystem support added by * Martin K. Petersen <mkp@mkp.net>, August 1999 * * UFS2 (of FreeBSD 5.x) support added by * Niraj Kumar <niraj17@iitbombay.org> , Jan 2004 *
*/
/* Copied from FreeBSD */ /* * Each disk drive contains some number of filesystems. * A filesystem consists of a number of cylinder groups. * Each cylinder group has inodes and data. * * A filesystem is described by its super-block, which in turn * describes the cylinder groups. The super-block is critical * data and is replicated in each cylinder group to protect against * catastrophic loss. This is done at `newfs' time and the critical * super-block data does not change, so the copies need not be * referenced further unless disaster strikes. * * For filesystem fs, the offsets of the various blocks of interest * are given in the super block as: * [fs->fs_sblkno] Super-block * [fs->fs_cblkno] Cylinder group block * [fs->fs_iblkno] Inode blocks * [fs->fs_dblkno] Data blocks * The beginning of cylinder group cg in fs, is given by * the ``cgbase(fs, cg)'' macro. * * Depending on the architecture and the media, the superblock may * reside in any one of four places. For tiny media where every block * counts, it is placed at the very front of the partition. Historically, * UFS1 placed it 8K from the front to leave room for the disk label and * a small bootstrap. For UFS2 it got moved to 64K from the front to leave * room for the disk label and a bigger bootstrap, and for really piggy * systems we check at 256K from the front if the first three fail. In * all cases the size of the superblock will be SBLOCKSIZE. All values are * given in byte-offset form, so they do not imply a sector size. The * SBLOCKSEARCH specifies the order in which the locations should be searched.
*/ #define SBLOCK_FLOPPY 0 #define SBLOCK_UFS1 8192 #define SBLOCK_UFS2 65536 #define SBLOCK_PIGGY 262144 #define SBLOCKSIZE 8192 #define SBLOCKSEARCH \
{ SBLOCK_UFS2, SBLOCK_UFS1, SBLOCK_FLOPPY, SBLOCK_PIGGY, -1 }
/* * MINFREE gives the minimum acceptable percentage of file system * blocks which may be free. If the freelist drops below this level * only the superuser may continue to allocate blocks. This may * be set to 0 if no reserve of free blocks is deemed necessary, * however throughput drops by fifty percent if the file system * is run at between 95% and 100% full; thus the minimum default * value of fs_minfree is 5%. However, to get good clustering * performance, 10% is a better choice. hence we use 10% as our * default value. With 10% free space, fragmentation is not a * problem, so we choose to optimize for time.
*/ #define UFS_MINFREE 5 #define UFS_DEFAULTOPT UFS_OPTTIME
/* * Turn file system block numbers into disk block addresses. * This maps file system blocks to device size blocks.
*/ #define ufs_fsbtodb(uspi, b) ((b) << (uspi)->s_fsbtodb) #define ufs_dbtofsb(uspi, b) ((b) >> (uspi)->s_fsbtodb)
/* * Cylinder group macros to locate things in cylinder groups. * They calc file system addresses of cylinder group data structures.
*/ #define ufs_cgbase(c) (uspi->s_fpg * (c)) #define ufs_cgstart(c) ((uspi)->fs_magic == UFS2_MAGIC ? ufs_cgbase(c) : \
(ufs_cgbase(c) + uspi->s_cgoffset * ((c) & ~uspi->s_cgmask))) #define ufs_cgsblock(c) (ufs_cgstart(c) + uspi->s_sblkno) /* super blk */ #define ufs_cgcmin(c) (ufs_cgstart(c) + uspi->s_cblkno) /* cg block */ #define ufs_cgimin(c) (ufs_cgstart(c) + uspi->s_iblkno) /* inode blk */ #define ufs_cgdmin(c) (ufs_cgstart(c) + uspi->s_dblkno) /* 1st data */
/* * Macros for handling inode numbers: * inode number to file system block offset. * inode number to cylinder group number. * inode number to file system block address.
*/ #define ufs_inotocg(x) ((x) / uspi->s_ipg) #define ufs_inotocgoff(x) ((x) % uspi->s_ipg) #define ufs_inotofsba(x) (((u64)ufs_cgimin(ufs_inotocg(x))) + ufs_inotocgoff(x) / uspi->s_inopf) #define ufs_inotofsbo(x) ((x) % uspi->s_inopf)
struct ufs_dir_entry {
__fs32 d_ino; /* inode number of this entry */
__fs16 d_reclen; /* length of this entry */ union {
__fs16 d_namlen; /* actual length of d_name */ struct {
__u8 d_type; /* file type */
__u8 d_namlen; /* length of string in d_name */
} d_44;
} d_u;
__u8 d_name[UFS_MAXNAMLEN + 1]; /* file name */
};
struct ufs_csum {
__fs32 cs_ndir; /* number of directories */
__fs32 cs_nbfree; /* number of free blocks */
__fs32 cs_nifree; /* number of free inodes */
__fs32 cs_nffree; /* number of free frags */
}; struct ufs2_csum_total {
__fs64 cs_ndir; /* number of directories */
__fs64 cs_nbfree; /* number of free blocks */
__fs64 cs_nifree; /* number of free inodes */
__fs64 cs_nffree; /* number of free frags */
__fs64 cs_numclusters; /* number of free clusters */
__fs64 cs_spare[3]; /* future expansion */
};
struct ufs_csum_core {
__u64 cs_ndir; /* number of directories */
__u64 cs_nbfree; /* number of free blocks */
__u64 cs_nifree; /* number of free inodes */
__u64 cs_nffree; /* number of free frags */
__u64 cs_numclusters; /* number of free clusters */
};
/* * File system flags
*/ #define UFS_UNCLEAN 0x01 /* file system not clean at mount (unused) */ #define UFS_DOSOFTDEP 0x02 /* file system using soft dependencies */ #define UFS_NEEDSFSCK 0x04 /* needs sync fsck (FreeBSD compat, unused) */ #define UFS_INDEXDIRS 0x08 /* kernel supports indexed directories */ #define UFS_ACLS 0x10 /* file system has ACLs enabled */ #define UFS_MULTILABEL 0x20 /* file system is MAC multi-label */ #define UFS_FLAGS_UPDATED 0x80 /* flags have been moved to new location */
#if 0 /* * This is the actual superblock, as it is laid out on the disk. * Do NOT use this structure, because of sizeof(ufs_super_block) > 512 and * it may occupy several blocks, use * struct ufs_super_block_(first,second,third) instead.
*/ struct ufs_super_block { union { struct {
__fs32 fs_link; /* UNUSED */
} fs_42; struct {
__fs32 fs_state; /* file system state flag */
} fs_sun;
} fs_u0;
__fs32 fs_rlink; /* UNUSED */
__fs32 fs_sblkno; /* addr of super-block in filesys */
__fs32 fs_cblkno; /* offset of cyl-block in filesys */
__fs32 fs_iblkno; /* offset of inode-blocks in filesys */
__fs32 fs_dblkno; /* offset of first data after cg */
__fs32 fs_cgoffset; /* cylinder group offset in cylinder */
__fs32 fs_cgmask; /* used to calc mod fs_ntrak */
__fs32 fs_time; /* last time written -- time_t */
__fs32 fs_size; /* number of blocks in fs */
__fs32 fs_dsize; /* number of data blocks in fs */
__fs32 fs_ncg; /* number of cylinder groups */
__fs32 fs_bsize; /* size of basic blocks in fs */
__fs32 fs_fsize; /* size of frag blocks in fs */
__fs32 fs_frag; /* number of frags in a block in fs */ /* these are configuration parameters */
__fs32 fs_minfree; /* minimum percentage of free blocks */
__fs32 fs_rotdelay; /* num of ms for optimal next block */
__fs32 fs_rps; /* disk revolutions per second */ /* these fields can be computed from the others */
__fs32 fs_bmask; /* ``blkoff'' calc of blk offsets */
__fs32 fs_fmask; /* ``fragoff'' calc of frag offsets */
__fs32 fs_bshift; /* ``lblkno'' calc of logical blkno */
__fs32 fs_fshift; /* ``numfrags'' calc number of frags */ /* these are configuration parameters */
__fs32 fs_maxcontig; /* max number of contiguous blks */
__fs32 fs_maxbpg; /* max number of blks per cyl group */ /* these fields can be computed from the others */
__fs32 fs_fragshift; /* block to frag shift */
__fs32 fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
__fs32 fs_sbsize; /* actual size of super block */
__fs32 fs_csmask; /* csum block offset */
__fs32 fs_csshift; /* csum block number */
__fs32 fs_nindir; /* value of NINDIR */
__fs32 fs_inopb; /* value of INOPB */
__fs32 fs_nspf; /* value of NSPF */ /* yet another configuration parameter */
__fs32 fs_optim; /* optimization preference, see below */ /* these fields are derived from the hardware */ union { struct {
__fs32 fs_npsect; /* # sectors/track including spares */
} fs_sun; struct {
__fs32 fs_state; /* file system state time stamp */
} fs_sunx86;
} fs_u1;
__fs32 fs_interleave; /* hardware sector interleave */
__fs32 fs_trackskew; /* sector 0 skew, per track */ /* a unique id for this filesystem (currently unused and unmaintained) */ /* In 4.3 Tahoe this space is used by fs_headswitch and fs_trkseek */ /* Neither of those fields is used in the Tahoe code right now but */ /* there could be problems if they are. */
__fs32 fs_id[2]; /* file system id */ /* sizes determined by number of cylinder groups and their sizes */
__fs32 fs_csaddr; /* blk addr of cyl grp summary area */
__fs32 fs_cssize; /* size of cyl grp summary area */
__fs32 fs_cgsize; /* cylinder group size */ /* these fields are derived from the hardware */
__fs32 fs_ntrak; /* tracks per cylinder */
__fs32 fs_nsect; /* sectors per track */
__fs32 fs_spc; /* sectors per cylinder */ /* this comes from the disk driver partitioning */
__fs32 fs_ncyl; /* cylinders in file system */ /* these fields can be computed from the others */
__fs32 fs_cpg; /* cylinders per group */
__fs32 fs_ipg; /* inodes per cylinder group */
__fs32 fs_fpg; /* blocks per group * fs_frag */ /* this data must be re-computed after crashes */ struct ufs_csum fs_cstotal; /* cylinder summary information */ /* these fields are cleared at mount time */
__s8 fs_fmod; /* super block modified flag */
__s8 fs_clean; /* file system is clean flag */
__s8 fs_ronly; /* mounted read-only flag */
__s8 fs_flags; union { struct {
__s8 fs_fsmnt[UFS_MAXMNTLEN];/* name mounted on */
__fs32 fs_cgrotor; /* last cg searched */
__fs32 fs_csp[UFS_MAXCSBUFS];/*list of fs_cs info buffers */
__fs32 fs_maxcluster;
__fs32 fs_cpc; /* cyl per cycle in postbl */
__fs16 fs_opostbl[16][8]; /* old rotation block list head */
} fs_u1; struct {
__s8 fs_fsmnt[UFS2_MAXMNTLEN]; /* name mounted on */
__u8 fs_volname[UFS2_MAXVOLLEN]; /* volume name */
__fs64 fs_swuid; /* system-wide uid */
__fs32 fs_pad; /* due to alignment of fs_swuid */
__fs32 fs_cgrotor; /* last cg searched */
__fs32 fs_ocsp[UFS2_NOCSPTRS]; /*list of fs_cs info buffers */
__fs32 fs_contigdirs;/*# of contiguously allocated dirs */
__fs32 fs_csp; /* cg summary info buffer for fs_cs */
__fs32 fs_maxcluster;
__fs32 fs_active;/* used by snapshots to track fs */
__fs32 fs_old_cpc; /* cyl per cycle in postbl */
__fs32 fs_maxbsize;/*maximum blocking factor permitted */
__fs64 fs_sparecon64[17];/*old rotation block list head */
__fs64 fs_sblockloc; /* byte offset of standard superblock */ struct ufs2_csum_total fs_cstotal;/*cylinder summary information*/ struct ufs_timeval fs_time; /* last time written */
__fs64 fs_size; /* number of blocks in fs */
__fs64 fs_dsize; /* number of data blocks in fs */
__fs64 fs_csaddr; /* blk addr of cyl grp summary area */
__fs64 fs_pendingblocks;/* blocks in process of being freed */
__fs32 fs_pendinginodes;/*inodes in process of being freed */
} fs_u2;
} fs_u11; union { struct {
__fs32 fs_sparecon[53];/* reserved for future constants */
__fs32 fs_reclaim;
__fs32 fs_sparecon2[1];
__fs32 fs_state; /* file system state time stamp */
__fs32 fs_qbmask[2]; /* ~usb_bmask */
__fs32 fs_qfmask[2]; /* ~usb_fmask */
} fs_sun; struct {
__fs32 fs_sparecon[53];/* reserved for future constants */
__fs32 fs_reclaim;
__fs32 fs_sparecon2[1];
__fs32 fs_npsect; /* # sectors/track including spares */
__fs32 fs_qbmask[2]; /* ~usb_bmask */
__fs32 fs_qfmask[2]; /* ~usb_fmask */
} fs_sunx86; struct {
__fs32 fs_sparecon[50];/* reserved for future constants */
__fs32 fs_contigsumsize;/* size of cluster summary array */
__fs32 fs_maxsymlinklen;/* max length of an internal symlink */
__fs32 fs_inodefmt; /* format of on-disk inodes */
__fs32 fs_maxfilesize[2]; /* max representable file size */
__fs32 fs_qbmask[2]; /* ~usb_bmask */
__fs32 fs_qfmask[2]; /* ~usb_fmask */
__fs32 fs_state; /* file system state time stamp */
} fs_44;
} fs_u2;
__fs32 fs_postblformat; /* format of positional layout tables */
__fs32 fs_nrpos; /* number of rotational positions */
__fs32 fs_postbloff; /* (__s16) rotation block list head */
__fs32 fs_rotbloff; /* (__u8) blocks for each rotation */
__fs32 fs_magic; /* magic number */
__u8 fs_space[1]; /* list of blocks for each rotation */
}; #endif/*struct ufs_super_block*/
/* * Preference for optimization.
*/ #define UFS_OPTTIME 0 /* minimize allocation time */ #define UFS_OPTSPACE 1 /* minimize disk fragmentation */
/* * Rotational layout table format types
*/ #define UFS_42POSTBLFMT -1 /* 4.2BSD rotational table format */ #define UFS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
/* * Convert cylinder group to base address of its global summary info.
*/ #define fs_cs(indx) s_csp[(indx)]
/* * Cylinder group block for a file system. * * Writable fields in the cylinder group are protected by the associated * super block lock fs->fs_lock.
*/ #define CG_MAGIC 0x090255 #define ufs_cg_chkmagic(sb, ucg) \
(fs32_to_cpu((sb), (ucg)->cg_magic) == CG_MAGIC) /* * Macros for access to old cylinder group array structures
*/ #define ufs_ocg_blktot(sb, ucg) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_btot) #define ufs_ocg_blks(sb, ucg, cylno) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_b[cylno]) #define ufs_ocg_inosused(sb, ucg) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_iused) #define ufs_ocg_blksfree(sb, ucg) fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_free) #define ufs_ocg_chkmagic(sb, ucg) \
(fs32_to_cpu((sb), ((struct ufs_old_cylinder_group *)(ucg))->cg_magic) == CG_MAGIC)
/* * size of this structure is 172 B
*/ struct ufs_cylinder_group {
__fs32 cg_link; /* linked list of cyl groups */
__fs32 cg_magic; /* magic number */
__fs32 cg_time; /* time last written */
__fs32 cg_cgx; /* we are the cgx'th cylinder group */
__fs16 cg_ncyl; /* number of cyl's this cg */
__fs16 cg_niblk; /* number of inode blocks this cg */
__fs32 cg_ndblk; /* number of data blocks this cg */ struct ufs_csum cg_cs; /* cylinder summary information */
__fs32 cg_rotor; /* position of last used block */
__fs32 cg_frotor; /* position of last used frag */
__fs32 cg_irotor; /* position of last used inode */
__fs32 cg_frsum[UFS_MAXFRAG]; /* counts of available frags */
__fs32 cg_btotoff; /* (__u32) block totals per cylinder */
__fs32 cg_boff; /* (short) free block positions */
__fs32 cg_iusedoff; /* (char) used inode map */
__fs32 cg_freeoff; /* (u_char) free block map */
__fs32 cg_nextfreeoff; /* (u_char) next available space */ union { struct {
__fs32 cg_clustersumoff; /* (u_int32) counts of avail clusters */
__fs32 cg_clusteroff; /* (u_int8) free cluster map */
__fs32 cg_nclusterblks; /* number of clusters this cg */
__fs32 cg_sparecon[13]; /* reserved for future use */
} cg_44; struct {
__fs32 cg_clustersumoff;/* (u_int32) counts of avail clusters */
__fs32 cg_clusteroff; /* (u_int8) free cluster map */
__fs32 cg_nclusterblks;/* number of clusters this cg */
__fs32 cg_niblk; /* number of inode blocks this cg */
__fs32 cg_initediblk; /* last initialized inode */
__fs32 cg_sparecon32[3];/* reserved for future use */
__fs64 cg_time; /* time last written */
__fs64 cg_sparecon[3]; /* reserved for future use */
} cg_u2;
__fs32 cg_sparecon[16]; /* reserved for future use */
} cg_u;
__u8 cg_space[1]; /* space for cylinder group maps */ /* actually longer */
};
/* Historic Cylinder group info */ struct ufs_old_cylinder_group {
__fs32 cg_link; /* linked list of cyl groups */
__fs32 cg_rlink; /* for incore cyl groups */
__fs32 cg_time; /* time last written */
__fs32 cg_cgx; /* we are the cgx'th cylinder group */
__fs16 cg_ncyl; /* number of cyl's this cg */
__fs16 cg_niblk; /* number of inode blocks this cg */
__fs32 cg_ndblk; /* number of data blocks this cg */ struct ufs_csum cg_cs; /* cylinder summary information */
__fs32 cg_rotor; /* position of last used block */
__fs32 cg_frotor; /* position of last used frag */
__fs32 cg_irotor; /* position of last used inode */
__fs32 cg_frsum[8]; /* counts of available frags */
__fs32 cg_btot[32]; /* block totals per cylinder */
__fs16 cg_b[32][8]; /* positions of free blocks */
__u8 cg_iused[256]; /* used inode map */
__fs32 cg_magic; /* magic number */
__u8 cg_free[1]; /* free block map */ /* actually longer */
};
/* * structure of an on-disk inode
*/ struct ufs_inode {
__fs16 ui_mode; /* 0x0 */
__fs16 ui_nlink; /* 0x2 */ union { struct {
__fs16 ui_suid; /* 0x4 */
__fs16 ui_sgid; /* 0x6 */
} oldids;
__fs32 ui_inumber; /* 0x4 lsf: inode number */
__fs32 ui_author; /* 0x4 GNU HURD: author */
} ui_u1;
__fs64 ui_size; /* 0x8 */ struct ufs_timeval ui_atime; /* 0x10 access */ struct ufs_timeval ui_mtime; /* 0x18 modification */ struct ufs_timeval ui_ctime; /* 0x20 creation */ union { struct {
__fs32 ui_db[UFS_NDADDR];/* 0x28 data blocks */
__fs32 ui_ib[UFS_NINDIR];/* 0x58 indirect blocks */
} ui_addr;
__u8 ui_symlink[4*(UFS_NDADDR+UFS_NINDIR)];/* 0x28 fast symlink */
} ui_u2;
__fs32 ui_flags; /* 0x64 immutable, append-only... */
__fs32 ui_blocks; /* 0x68 blocks in use */
__fs32 ui_gen; /* 0x6c like ext2 i_version, for NFS support */ union { struct {
__fs32 ui_shadow; /* 0x70 shadow inode with security data */
__fs32 ui_uid; /* 0x74 long EFT version of uid */
__fs32 ui_gid; /* 0x78 long EFT version of gid */
__fs32 ui_oeftflag; /* 0x7c reserved */
} ui_sun; struct {
__fs32 ui_uid; /* 0x70 File owner */
__fs32 ui_gid; /* 0x74 File group */
__fs32 ui_spare[2]; /* 0x78 reserved */
} ui_44; struct {
__fs32 ui_uid; /* 0x70 */
__fs32 ui_gid; /* 0x74 */
__fs16 ui_modeh; /* 0x78 mode high bits */
__fs16 ui_spare; /* 0x7A unused */
__fs32 ui_trans; /* 0x7c filesystem translator */
} ui_hurd;
} ui_u3;
};
/* FreeBSD has these in sys/stat.h */ /* ui_flags that can be set by a file owner */ #define UFS_UF_SETTABLE 0x0000ffff #define UFS_UF_NODUMP 0x00000001 /* do not dump */ #define UFS_UF_IMMUTABLE 0x00000002 /* immutable (can't "change") */ #define UFS_UF_APPEND 0x00000004 /* append-only */ #define UFS_UF_OPAQUE 0x00000008 /* directory is opaque (unionfs) */ #define UFS_UF_NOUNLINK 0x00000010 /* can't be removed or renamed */ /* ui_flags that only root can set */ #define UFS_SF_SETTABLE 0xffff0000 #define UFS_SF_ARCHIVED 0x00010000 /* archived */ #define UFS_SF_IMMUTABLE 0x00020000 /* immutable (can't "change") */ #define UFS_SF_APPEND 0x00040000 /* append-only */ #define UFS_SF_NOUNLINK 0x00100000 /* can't be removed or renamed */
/* * This structure is used for reading disk structures larger * than the size of fragment.
*/ struct ufs_buffer_head {
__u64 fragment; /* first fragment */
__u64 count; /* number of fragments */ struct buffer_head * bh[UFS_MAXFRAG]; /* buffers */
};
struct ufs_cg_private_info { struct ufs_buffer_head c_ubh;
__u32 c_cgx; /* number of cylidner group */
__u16 c_ncyl; /* number of cyl's this cg */
__u16 c_niblk; /* number of inode blocks this cg */
__u32 c_ndblk; /* number of data blocks this cg */
__u32 c_rotor; /* position of last used block */
__u32 c_frotor; /* position of last used frag */
__u32 c_irotor; /* position of last used inode */
__u32 c_btotoff; /* (__u32) block totals per cylinder */
__u32 c_boff; /* (short) free block positions */
__u32 c_iusedoff; /* (char) used inode map */
__u32 c_freeoff; /* (u_char) free block map */
__u32 c_nextfreeoff; /* (u_char) next available space */
__u32 c_clustersumoff;/* (u_int32) counts of avail clusters */
__u32 c_clusteroff; /* (u_int8) free cluster map */
__u32 c_nclusterblks; /* number of clusters this cg */
};
struct ufs_sb_private_info { struct ufs_buffer_head s_ubh; /* buffer containing super block */ struct ufs_csum_core cs_total;
__u32 s_sblkno; /* offset of super-blocks in filesys */
__u32 s_cblkno; /* offset of cg-block in filesys */
__u32 s_iblkno; /* offset of inode-blocks in filesys */
__u32 s_dblkno; /* offset of first data after cg */
__u32 s_cgoffset; /* cylinder group offset in cylinder */
__u32 s_cgmask; /* used to calc mod fs_ntrak */
__u64 s_size; /* number of blocks (fragments) in fs */
__u64 s_dsize; /* number of data blocks in fs */
__u32 s_ncg; /* number of cylinder groups */
__u32 s_bsize; /* size of basic blocks */
__u32 s_fsize; /* size of fragments */
__u32 s_fpb; /* fragments per block */
__u32 s_minfree; /* minimum percentage of free blocks */
__u32 s_bmask; /* `blkoff'' calc of blk offsets */
__u32 s_fmask; /* s_fsize mask */
__u32 s_bshift; /* `lblkno'' calc of logical blkno */
__u32 s_fshift; /* s_fsize shift */
__u32 s_fpbshift; /* fragments per block shift */
__u32 s_fsbtodb; /* fsbtodb and dbtofsb shift constant */
__u32 s_sbsize; /* actual size of super block */
__u32 s_csmask; /* csum block offset */
__u32 s_csshift; /* csum block number */
__u32 s_nindir; /* value of NINDIR */
__u32 s_inopb; /* value of INOPB */
__u32 s_nspf; /* value of NSPF */
__u32 s_npsect; /* # sectors/track including spares */
__u32 s_interleave; /* hardware sector interleave */
__u32 s_trackskew; /* sector 0 skew, per track */
__u64 s_csaddr; /* blk addr of cyl grp summary area */
__u32 s_cssize; /* size of cyl grp summary area */
__u32 s_cgsize; /* cylinder group size */
__u32 s_ntrak; /* tracks per cylinder */
__u32 s_nsect; /* sectors per track */
__u32 s_spc; /* sectors per cylinder */
__u32 s_ipg; /* inodes per cylinder group */
__u32 s_fpg; /* fragments per group */
__u32 s_cpc; /* cyl per cycle in postbl */
__s32 s_contigsumsize;/* size of cluster summary array, 44bsd */
__s64 s_qbmask; /* ~usb_bmask */
__s64 s_qfmask; /* ~usb_fmask */
__s32 s_postblformat; /* format of positional layout tables */
__s32 s_nrpos; /* number of rotational positions */
__s32 s_postbloff; /* (__s16) rotation block list head */
__s32 s_rotbloff; /* (__u8) blocks for each rotation */
__u32 s_fpbmask; /* fragments per block mask */
__u32 s_apb; /* address per block */
__u32 s_apbmask; /* address per block mask */
__u32 s_apbshift; /* address per block shift */
__u32 s_nspfshift; /* number of sector per fragment shift */
__u32 s_nspb; /* number of sector per block */
__u32 s_inopf; /* inodes per fragment */
__u32 s_sbbase; /* offset of NeXTstep superblock */
__u32 s_bpf; /* bits per fragment */
__u32 s_bpfshift; /* bits per fragment shift*/
__u32 s_bpfmask; /* bits per fragment mask */
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