/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#ifndef _SYS_FS_UFS_FS_H
#define _SYS_FS_UFS_FS_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/isa_defs.h>
#include <sys/types32.h>
#include <sys/t_lock.h> /* for kmutex_t */
#ifdef __cplusplus
extern "C" {
#endif
/*
* The following values are minor release values for UFS.
* The fs_version field in the superblock will equal one of them.
*/
#define MTB_UFS_VERSION_MIN 1
#define MTB_UFS_VERSION_1 1
#define UFS_VERSION_MIN 0
#define UFS_EFISTYLE4NONEFI_VERSION_2 2
/*
* Each disk drive contains some number of file systems.
* A file system consists of a number of cylinder groups.
* Each cylinder group has inodes and data.
*
* A file system is described by its super-block, which in turn
* describes the cylinder groups. The super-block is critical
* data and is replicated in the first 10 cylinder groups and the
* the last 10 cylinder groups to protect against
* catastrophic loss. This is done at mkfs time and the critical
* super-block data does not change, so the copies need not be
* referenced further unless disaster strikes.
*
* For file system 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.
*
* The first boot and super blocks are given in absolute disk addresses.
* The byte-offset forms are preferred, as they don't imply a sector size.
*/
#define BBSIZE 8192
#define SBSIZE 8192
#define BBOFF ((off_t)(0))
#define SBOFF ((off_t)(BBOFF + BBSIZE))
#define BBLOCK ((daddr32_t)(0))
#define SBLOCK ((daddr32_t)(BBLOCK + BBSIZE / DEV_BSIZE))
/*
* Addresses stored in inodes are capable of addressing fragments
* of `blocks'. File system blocks of at most size MAXBSIZE can
* be optionally broken into 2, 4, or 8 pieces, each of which is
* addressible; these pieces may be DEV_BSIZE, or some multiple of
* a DEV_BSIZE unit.
*
* Large files consist of exclusively large data blocks. To avoid
* undue wasted disk space, the last data block of a small file may be
* allocated as only as many fragments of a large block as are
* necessary. The file system format retains only a single pointer
* to such a fragment, which is a piece of a single large block that
* has been divided. The size of such a fragment is determinable from
* information in the inode, using the ``blksize(fs, ip, lbn)'' macro.
*
* The file system records space availability at the fragment level;
* to determine block availability, aligned fragments are examined.
*
* The root inode is the root of the file system.
* Inode 0 can't be used for normal purposes and
* historically bad blocks were linked to inode 1,
* thus the root inode is 2. (inode 1 is no longer used for
* this purpose, however numerous dump tapes make this
* assumption, so we are stuck with it)
* The lost+found directory is given the next available
* inode when it is created by ``mkfs''.
*/
#define UFSROOTINO ((ino_t)2) /* i number of all roots */
#define LOSTFOUNDINO (UFSROOTINO + 1)
#ifndef _LONGLONG_TYPE
#define UFS_MAXOFFSET_T MAXOFF_T
#define UFS_FILESIZE_BITS 32
#else
#define UFS_MAXOFFSET_T ((1LL << NBBY * sizeof (daddr32_t) + DEV_BSHIFT - 1) \
- 1)
#define UFS_FILESIZE_BITS 41
#endif /* _LONGLONG_TYPE */
/*
* MINBSIZE is the smallest allowable block size.
* In order to insure that it is possible to create files of size
* 2^32 with only two levels of indirection, MINBSIZE is set to 4096.
* MINBSIZE must be big enough to hold a cylinder group block,
* thus changes to (struct cg) must keep its size within MINBSIZE.
* Note that super blocks are always of size SBSIZE,
* and that both SBSIZE and MAXBSIZE must be >= MINBSIZE.
*/
#define MINBSIZE 4096
/*
* The path name on which the file system is mounted is maintained
* in fs_fsmnt. MAXMNTLEN defines the amount of space allocated in
* the super block for this name.
* The limit on the amount of summary information per file system
* is defined by MAXCSBUFS. It is currently parameterized for a
* maximum of two million cylinders.
*/
#define MAXMNTLEN 512
#define MAXCSBUFS 32
#define LABEL_TYPE_VTOC 1
#define LABEL_TYPE_EFI 2
#define LABEL_TYPE_OTHER 3
/*
* The following constant is taken from the ANSI T13 ATA Specification
* and defines the maximum size (in sectors) that an ATA disk can be
* and still has to provide CHS translation. For a disk above this
* size all sectors are to be accessed via their LBA address. This
* makes a good cut off value to move from disk provided geometry
* to the predefined defaults used in efi label disks.
*/
#define CHSLIMIT (63 * 256 * 1024)
/*
* Per cylinder group information; summarized in blocks allocated
* from first cylinder group data blocks. These blocks have to be
* read in from fs_csaddr (size fs_cssize) in addition to the
* super block.
*
* N.B. sizeof (struct csum) must be a power of two in order for
* the ``fs_cs'' macro to work (see below).
*/
struct csum {
int32_t cs_ndir; /* number of directories */
int32_t cs_nbfree; /* number of free blocks */
int32_t cs_nifree; /* number of free inodes */
int32_t cs_nffree; /* number of free frags */
};
/*
* In the 5.0 release, the file system state flag in the superblock (fs_clean)
* is now used. The value of fs_clean can be:
* FSACTIVE file system may have fsck inconsistencies
* FSCLEAN file system has successfully unmounted (implies
* everything is ok)
* FSSTABLE No fsck inconsistencies, no guarantee on user data
* FSBAD file system is mounted from a partition that is
* neither FSCLEAN or FSSTABLE
* FSSUSPEND Clean flag processing is temporarily disabled
* FSLOG Logging file system
* Under this scheme, fsck can safely skip file systems that
* are FSCLEAN or FSSTABLE. To provide additional safeguard,
* fs_clean information could be trusted only if
* fs_state == FSOKAY - fs_time, where FSOKAY is a constant
*
* Note: mount(2) will now return ENOSPC if fs_clean is neither FSCLEAN nor
* FSSTABLE, or fs_state is not valid. The exceptions are the root or
* the read-only partitions
*/
/*
* Super block for a file system.
*
* Most of the data in the super block is read-only data and needs
* no explicit locking to protect it. Exceptions are:
* fs_time
* fs_optim
* fs_cstotal
* fs_fmod
* fs_cgrotor
* fs_flags (largefiles flag - set when a file grows large)
* These fields require the use of fs->fs_lock.
*/
#define FS_MAGIC 0x011954
#define MTB_UFS_MAGIC 0xdecade
#define FSOKAY (0x7c269d38)
/* #define FSOKAY (0x7c269d38 + 3) */
/*
* fs_clean values
*/
#define FSACTIVE ((char)0)
#define FSCLEAN ((char)0x1)
#define FSSTABLE ((char)0x2)
#define FSBAD ((char)0xff) /* mounted !FSCLEAN and !FSSTABLE */
#define FSSUSPEND ((char)0xfe) /* temporarily suspended */
#define FSLOG ((char)0xfd) /* logging fs */
#define FSFIX ((char)0xfc) /* being repaired while mounted */
/*
* fs_flags values
*/
#define FSLARGEFILES ((char)0x1) /* largefiles exist on filesystem */
struct fs {
uint32_t fs_link; /* linked list of file systems */
uint32_t fs_rolled; /* logging only: fs fully rolled */
daddr32_t fs_sblkno; /* addr of super-block in filesys */
daddr32_t fs_cblkno; /* offset of cyl-block in filesys */
daddr32_t fs_iblkno; /* offset of inode-blocks in filesys */
daddr32_t fs_dblkno; /* offset of first data after cg */
int32_t fs_cgoffset; /* cylinder group offset in cylinder */
int32_t fs_cgmask; /* used to calc mod fs_ntrak */
time32_t fs_time; /* last time written */
int32_t fs_size; /* number of blocks in fs */
int32_t fs_dsize; /* number of data blocks in fs */
int32_t fs_ncg; /* number of cylinder groups */
int32_t fs_bsize; /* size of basic blocks in fs */
int32_t fs_fsize; /* size of frag blocks in fs */
int32_t fs_frag; /* number of frags in a block in fs */
/* these are configuration parameters */
int32_t fs_minfree; /* minimum percentage of free blocks */
int32_t fs_rotdelay; /* num of ms for optimal next block */
int32_t fs_rps; /* disk revolutions per second */
/* these fields can be computed from the others */
int32_t fs_bmask; /* ``blkoff'' calc of blk offsets */
int32_t fs_fmask; /* ``fragoff'' calc of frag offsets */
int32_t fs_bshift; /* ``lblkno'' calc of logical blkno */
int32_t fs_fshift; /* ``numfrags'' calc number of frags */
/* these are configuration parameters */
int32_t fs_maxcontig; /* max number of contiguous blks */
int32_t fs_maxbpg; /* max number of blks per cyl group */
/* these fields can be computed from the others */
int32_t fs_fragshift; /* block to frag shift */
int32_t fs_fsbtodb; /* fsbtodb and dbtofsb shift constant */
int32_t fs_sbsize; /* actual size of super block */
int32_t fs_csmask; /* csum block offset */
int32_t fs_csshift; /* csum block number */
int32_t fs_nindir; /* value of NINDIR */
int32_t fs_inopb; /* value of INOPB */
int32_t fs_nspf; /* value of NSPF */
/* yet another configuration parameter */
int32_t fs_optim; /* optimization preference, see below */
/* these fields are derived from the hardware */
/* USL SVR4 compatibility */
#ifdef _LITTLE_ENDIAN
/*
* USL SVR4 compatibility
*
* There was a significant divergence here between Solaris and
* SVR4 for x86. By swapping these two members in the superblock,
* we get read-only compatibility of SVR4 filesystems. Otherwise
* there would be no compatibility. This change was introduced
* during bootstrapping of Solaris on x86. By making this ifdef'ed
* on byte order, we provide ongoing compatibility across all
* platforms with the same byte order, the highest compatibility
* that can be achieved.
*/
int32_t fs_state; /* file system state time stamp */
#else
int32_t fs_npsect; /* # sectors/track including spares */
#endif
int32_t fs_si; /* summary info state - lufs only */
int32_t 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. */
int32_t fs_id[2]; /* file system id */
/* sizes determined by number of cylinder groups and their sizes */
daddr32_t fs_csaddr; /* blk addr of cyl grp summary area */
int32_t fs_cssize; /* size of cyl grp summary area */
int32_t fs_cgsize; /* cylinder group size */
/* these fields are derived from the hardware */
int32_t fs_ntrak; /* tracks per cylinder */
int32_t fs_nsect; /* sectors per track */
int32_t fs_spc; /* sectors per cylinder */
/* this comes from the disk driver partitioning */
int32_t fs_ncyl; /* cylinders in file system */
/* these fields can be computed from the others */
int32_t fs_cpg; /* cylinders per group */
int32_t fs_ipg; /* inodes per group */
int32_t fs_fpg; /* blocks per group * fs_frag */
/* this data must be re-computed after crashes */
struct csum fs_cstotal; /* cylinder summary information */
/* these fields are cleared at mount time */
char fs_fmod; /* super block modified flag */
char fs_clean; /* file system state flag */
char fs_ronly; /* mounted read-only flag */
char fs_flags; /* largefiles flag, etc. */
char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
/* these fields retain the current block allocation info */
int32_t fs_cgrotor; /* last cg searched */
/*
* The following used to be fs_csp[MAXCSBUFS]. It was not
* used anywhere except in old utilities. We removed this
* in 5.6 and expect fs_u.fs_csp to be used instead.
* We no longer limit fs_cssize based on MAXCSBUFS.
*/
union { /* fs_cs (csum) info */
uint32_t fs_csp_pad[MAXCSBUFS];
struct csum *fs_csp;
} fs_u;
int32_t fs_cpc; /* cyl per cycle in postbl */
short fs_opostbl[16][8]; /* old rotation block list head */
int32_t fs_sparecon[51]; /* reserved for future constants */
int32_t fs_version; /* minor version of ufs */
int32_t fs_logbno; /* block # of embedded log */
int32_t fs_reclaim; /* reclaim open, deleted files */
int32_t fs_sparecon2; /* reserved for future constant */
#ifdef _LITTLE_ENDIAN
/* USL SVR4 compatibility */
int32_t fs_npsect; /* # sectors/track including spares */
#else
int32_t fs_state; /* file system state time stamp */
#endif
quad_t fs_qbmask; /* ~fs_bmask - for use with quad size */
quad_t fs_qfmask; /* ~fs_fmask - for use with quad size */
int32_t fs_postblformat; /* format of positional layout tables */
int32_t fs_nrpos; /* number of rotaional positions */
int32_t fs_postbloff; /* (short) rotation block list head */
int32_t fs_rotbloff; /* (uchar_t) blocks for each rotation */
int32_t fs_magic; /* magic number */
uchar_t fs_space[1]; /* list of blocks for each rotation */
/* actually longer */
};
/*
* values for fs_reclaim
*/
#define FS_RECLAIM (0x00000001) /* run the reclaim-files thread */
#define FS_RECLAIMING (0x00000002) /* running the reclaim-files thread */
#define FS_CHECKCLEAN (0x00000004) /* checking for a clean file system */
#define FS_CHECKRECLAIM (0x00000008) /* checking for a reclaimable file */
/*
* values for fs_rolled
*/
#define FS_PRE_FLAG 0 /* old system, prior to fs_rolled flag */
#define FS_ALL_ROLLED 1
#define FS_NEED_ROLL 2
/*
* values for fs_si, logging only
* si is the summary of the summary - a copy of the cylinder group summary
* info held in an array for perf. On a mount if this is out of date
* (FS_SI_BAD) it can be re-constructed by re-reading the cgs.
*/
#define FS_SI_OK 0 /* on-disk summary info ok */
#define FS_SI_BAD 1 /* out of date on-disk si */
/*
* Preference for optimization.
*/
#define FS_OPTTIME 0 /* minimize allocation time */
#define FS_OPTSPACE 1 /* minimize disk fragmentation */
/*
* Rotational layout table format types
*/
#define FS_42POSTBLFMT -1 /* 4.2BSD rotational table format */
#define FS_DYNAMICPOSTBLFMT 1 /* dynamic rotational table format */
/*
* Macros for access to superblock array structures
*/
#ifdef _KERNEL
#define fs_postbl(ufsvfsp, cylno) \
(((ufsvfsp)->vfs_fs->fs_postblformat != FS_DYNAMICPOSTBLFMT) \
? ((ufsvfsp)->vfs_fs->fs_opostbl[cylno]) \
: ((short *)((char *)(ufsvfsp)->vfs_fs + \
(ufsvfsp)->vfs_fs->fs_postbloff) \
+ (cylno) * (ufsvfsp)->vfs_nrpos))
#else
#define fs_postbl(fs, cylno) \
(((fs)->fs_postblformat != FS_DYNAMICPOSTBLFMT) \
? ((fs)->fs_opostbl[cylno]) \
: ((short *)((char *)(fs) + \
(fs)->fs_postbloff) \
+ (cylno) * (fs)->fs_nrpos))
#endif
#define fs_rotbl(fs) \
(((fs)->fs_postblformat != FS_DYNAMICPOSTBLFMT) \
? ((fs)->fs_space) \
: ((uchar_t *)((char *)(fs) + (fs)->fs_rotbloff)))
/*
* Convert cylinder group to base address of its global summary info.
*
* N.B. This macro assumes that sizeof (struct csum) is a power of two.
* We just index off the first entry into one big array
*/
#define fs_cs(fs, indx) fs_u.fs_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
struct cg {
uint32_t cg_link; /* NOT USED linked list of cyl groups */
int32_t cg_magic; /* magic number */
time32_t cg_time; /* time last written */
int32_t cg_cgx; /* we are the cgx'th cylinder group */
short cg_ncyl; /* number of cyl's this cg */
short cg_niblk; /* number of inode blocks this cg */
int32_t cg_ndblk; /* number of data blocks this cg */
struct csum cg_cs; /* cylinder summary information */
int32_t cg_rotor; /* position of last used block */
int32_t cg_frotor; /* position of last used frag */
int32_t cg_irotor; /* position of last used inode */
int32_t cg_frsum[MAXFRAG]; /* counts of available frags */
int32_t cg_btotoff; /* (int32_t)block totals per cylinder */
int32_t cg_boff; /* (short) free block positions */
int32_t cg_iusedoff; /* (char) used inode map */
int32_t cg_freeoff; /* (uchar_t) free block map */
int32_t cg_nextfreeoff; /* (uchar_t) next available space */
int32_t cg_sparecon[16]; /* reserved for future use */
uchar_t cg_space[1]; /* space for cylinder group maps */
/* actually longer */
};
/*
* Macros for access to cylinder group array structures
*/
#define cg_blktot(cgp) \
(((cgp)->cg_magic != CG_MAGIC) \
? (((struct ocg *)(cgp))->cg_btot) \
: ((int32_t *)((char *)(cgp) + (cgp)->cg_btotoff)))
#ifdef _KERNEL
#define cg_blks(ufsvfsp, cgp, cylno) \
(((cgp)->cg_magic != CG_MAGIC) \
? (((struct ocg *)(cgp))->cg_b[cylno]) \
: ((short *)((char *)(cgp) + (cgp)->cg_boff) + \
(cylno) * (ufsvfsp)->vfs_nrpos))
#else
#define cg_blks(fs, cgp, cylno) \
(((cgp)->cg_magic != CG_MAGIC) \
? (((struct ocg *)(cgp))->cg_b[cylno]) \
: ((short *)((char *)(cgp) + (cgp)->cg_boff) + \
(cylno) * (fs)->fs_nrpos))
#endif
#define cg_inosused(cgp) \
(((cgp)->cg_magic != CG_MAGIC) \
? (((struct ocg *)(cgp))->cg_iused) \
: ((char *)((char *)(cgp) + (cgp)->cg_iusedoff)))
#define cg_blksfree(cgp) \
(((cgp)->cg_magic != CG_MAGIC) \
? (((struct ocg *)(cgp))->cg_free) \
: ((uchar_t *)((char *)(cgp) + (cgp)->cg_freeoff)))
#define cg_chkmagic(cgp) \
((cgp)->cg_magic == CG_MAGIC || \
((struct ocg *)(cgp))->cg_magic == CG_MAGIC)
/*
* The following structure is defined
* for compatibility with old file systems.
*/
struct ocg {
uint32_t cg_link; /* NOT USED linked list of cyl groups */
uint32_t cg_rlink; /* NOT USED incore cyl groups */
time32_t cg_time; /* time last written */
int32_t cg_cgx; /* we are the cgx'th cylinder group */
short cg_ncyl; /* number of cyl's this cg */
short cg_niblk; /* number of inode blocks this cg */
int32_t cg_ndblk; /* number of data blocks this cg */
struct csum cg_cs; /* cylinder summary information */
int32_t cg_rotor; /* position of last used block */
int32_t cg_frotor; /* position of last used frag */
int32_t cg_irotor; /* position of last used inode */
int32_t cg_frsum[8]; /* counts of available frags */
int32_t cg_btot[32]; /* block totals per cylinder */
short cg_b[32][8]; /* positions of free blocks */
char cg_iused[256]; /* used inode map */
int32_t cg_magic; /* magic number */
uchar_t cg_free[1]; /* free block map */
/* actually longer */
};
/*
* Turn frag offsets into disk block addresses.
* This maps frags to device size blocks.
* (In the names of these macros, "fsb" refers to "frags", not
* file system blocks.)
*/
#ifdef KERNEL
#define fsbtodb(fs, b) (((daddr_t)(b)) << (fs)->fs_fsbtodb)
#else /* KERNEL */
#define fsbtodb(fs, b) (((diskaddr_t)(b)) << (fs)->fs_fsbtodb)
#endif /* KERNEL */
#define dbtofsb(fs, b) ((b) >> (fs)->fs_fsbtodb)
/*
* Get the offset of the log, in either sectors, frags, or file system
* blocks. The interpretation of the fs_logbno field depends on whether
* this is UFS or MTB UFS. (UFS stores the value as sectors. MTBUFS
* stores the value as frags.)
*/
#ifdef KERNEL
#define logbtodb(fs, b) ((fs)->fs_magic == FS_MAGIC ? \
(daddr_t)(b) : ((daddr_t)(b) << (fs)->fs_fsbtodb))
#else /* KERNEL */
#define logbtodb(fs, b) ((fs)->fs_magic == FS_MAGIC ? \
(diskaddr_t)(b) : ((diskaddr_t)(b) << (fs)->fs_fsbtodb))
#endif /* KERNEL */
#define logbtofrag(fs, b) ((fs)->fs_magic == FS_MAGIC ? \
(b) >> (fs)->fs_fsbtodb : (b))
#define logbtofsblk(fs, b) ((fs)->fs_magic == FS_MAGIC ? \
(b) >> ((fs)->fs_fsbtodb + (fs)->fs_fragshift) : \
(b) >> (fs)->fs_fragshift)
/*
* Cylinder group macros to locate things in cylinder groups.
* They calc file system addresses of cylinder group data structures.
*/
#define cgbase(fs, c) ((daddr32_t)((fs)->fs_fpg * (c)))
#define cgstart(fs, c) \
(cgbase(fs, c) + (fs)->fs_cgoffset * ((c) & ~((fs)->fs_cgmask)))
#define cgsblock(fs, c) (cgstart(fs, c) + (fs)->fs_sblkno) /* super blk */
#define cgtod(fs, c) (cgstart(fs, c) + (fs)->fs_cblkno) /* cg block */
#define cgimin(fs, c) (cgstart(fs, c) + (fs)->fs_iblkno) /* inode blk */
#define cgdmin(fs, c) (cgstart(fs, c) + (fs)->fs_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 itoo(fs, x) ((x) % (uint32_t)INOPB(fs))
#define itog(fs, x) ((x) / (uint32_t)(fs)->fs_ipg)
#define itod(fs, x) \
((daddr32_t)(cgimin(fs, itog(fs, x)) + \
(blkstofrags((fs), (((x)%(ulong_t)(fs)->fs_ipg)/(ulong_t)INOPB(fs))))))
/*
* Give cylinder group number for a file system block.
* Give cylinder group block number for a file system block.
*/
#define dtog(fs, d) ((d) / (fs)->fs_fpg)
#define dtogd(fs, d) ((d) % (fs)->fs_fpg)
/*
* Extract the bits for a block from a map.
* Compute the cylinder and rotational position of a cyl block addr.
*/
#define blkmap(fs, map, loc) \
(((map)[(loc) / NBBY] >> ((loc) % NBBY)) & \
(0xff >> (NBBY - (fs)->fs_frag)))
#define cbtocylno(fs, bno) \
((bno) * NSPF(fs) / (fs)->fs_spc)
#ifdef _KERNEL
#define cbtorpos(ufsvfsp, bno) \
((((bno) * NSPF((ufsvfsp)->vfs_fs) % (ufsvfsp)->vfs_fs->fs_spc) % \
(ufsvfsp)->vfs_fs->fs_nsect) * \
(ufsvfsp)->vfs_nrpos) / (ufsvfsp)->vfs_fs->fs_nsect
#else
#define cbtorpos(fs, bno) \
((((bno) * NSPF(fs) % (fs)->fs_spc) % \
(fs)->fs_nsect) * \
(fs)->fs_nrpos) / (fs)->fs_nsect
#endif
/*
* The following macros optimize certain frequently calculated
* quantities by using shifts and masks in place of divisions
* modulos and multiplications.
*/
/*
* This macro works for 40 bit offset support in ufs because
* this calculates offset in the block and therefore no loss of
* information while casting to int.
*/
#define blkoff(fs, loc) /* calculates (loc % fs->fs_bsize) */ \
((int)((loc) & ~(fs)->fs_bmask))
/*
* This macro works for 40 bit offset support similar to blkoff
*/
#define fragoff(fs, loc) /* calculates (loc % fs->fs_fsize) */ \
((int)((loc) & ~(fs)->fs_fmask))
/*
* The cast to int32_t does not result in any loss of information because
* the number of logical blocks in the file system is limited to
* what fits in an int32_t anyway.
*/
#define lblkno(fs, loc) /* calculates (loc / fs->fs_bsize) */ \
((int32_t)((loc) >> (fs)->fs_bshift))
/*
* The same argument as above applies here.
*/
#define numfrags(fs, loc) /* calculates (loc / fs->fs_fsize) */ \
((int32_t)((loc) >> (fs)->fs_fshift))
/*
* Size can be a 64-bit value and therefore we sign extend fs_bmask
* to a 64-bit value too so that the higher 32 bits are masked
* properly. Note that the type of fs_bmask has to be signed. Otherwise
* compiler will set the higher 32 bits as zero and we don't want
* this to happen.
*/
#define blkroundup(fs, size) /* calculates roundup(size, fs->fs_bsize) */ \
(((size) + (fs)->fs_bsize - 1) & (offset_t)(fs)->fs_bmask)
/*
* Same argument as above.
*/
#define fragroundup(fs, size) /* calculates roundup(size, fs->fs_fsize) */ \
(((size) + (fs)->fs_fsize - 1) & (offset_t)(fs)->fs_fmask)
/*
* frags cannot exceed 32-bit value since we only support 40bit sizes.
*/
#define fragstoblks(fs, frags) /* calculates (frags / fs->fs_frag) */ \
((frags) >> (fs)->fs_fragshift)
#define blkstofrags(fs, blks) /* calculates (blks * fs->fs_frag) */ \
((blks) << (fs)->fs_fragshift)
#define fragnum(fs, fsb) /* calculates (fsb % fs->fs_frag) */ \
((fsb) & ((fs)->fs_frag - 1))
#define blknum(fs, fsb) /* calculates rounddown(fsb, fs->fs_frag) */ \
((fsb) &~ ((fs)->fs_frag - 1))
/*
* Determine the number of available frags given a
* percentage to hold in reserve
*/
#define freespace(fs, ufsvfsp) \
((blkstofrags((fs), (fs)->fs_cstotal.cs_nbfree) + \
(fs)->fs_cstotal.cs_nffree) - (ufsvfsp)->vfs_minfrags)
/*
* Determining the size of a file block in the file system.
*/
#define blksize(fs, ip, lbn) \
(((lbn) >= NDADDR || \
(ip)->i_size >= (offset_t)((lbn) + 1) << (fs)->fs_bshift) \
? (fs)->fs_bsize \
: (fragroundup(fs, blkoff(fs, (ip)->i_size))))
#define dblksize(fs, dip, lbn) \
(((lbn) >= NDADDR || \
(dip)->di_size >= (offset_t)((lbn) + 1) << (fs)->fs_bshift) \
? (fs)->fs_bsize \
: (fragroundup(fs, blkoff(fs, (dip)->di_size))))
/*
* Number of disk sectors per block; assumes DEV_BSIZE byte sector size.
*/
#define NSPB(fs) ((fs)->fs_nspf << (fs)->fs_fragshift)
#define NSPF(fs) ((fs)->fs_nspf)
/*
* INOPB is the number of inodes in a secondary storage block.
*/
#define INOPB(fs) ((fs)->fs_inopb)
#define INOPF(fs) ((fs)->fs_inopb >> (fs)->fs_fragshift)
/*
* NINDIR is the number of indirects in a file system block.
*/
#define NINDIR(fs) ((fs)->fs_nindir)
/*
* bit map related macros
*/
#define bitloc(a, i) ((a)[(i)/NBBY])
#define setbit(a, i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
#define clrbit(a, i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define isclr(a, i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
#define getfs(vfsp) \
((struct fs *)((struct ufsvfs *)vfsp->vfs_data)->vfs_bufp->b_un.b_addr)
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_UFS_FS_H */