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Merge of 2.4.x-xfs:slinx:116119a by nathans.

  ENOTSUP was defined to be ENOTSUPP.  this is a problem because some glibc
  versions and some architectures do not grok this code (errno.h in the kernel
  only defines this within __KERNEL__).  we now define it as EOPNOTSUPP which
  will work everywhere and is the same thing we use for extended attributes
  not available elsewhere in the kernel (ENOTSUP is the ACL not enabled code).

/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef __XFS_LINUX__
#define __XFS_LINUX__

#include <linux/vnode.h>
#include <linux/mm.h>
#include <linux/xfs_fs.h>
#include <linux/xfs_vfs.h>
#include <linux/xfs_vnode.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <pagebuf/page_buf.h>
#include <linux/file.h>
#include <linux/swap.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <asm/page.h>
#include <asm/div64.h>
#include <asm/param.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include <linux/xfs_cred.h>
#include <linux/xfs_stats.h>
#include <linux/xfs_sysctl.h>
#include <linux/xfs_super.h>
#include <linux/xfs_globals.h>
#include <linux/xfs_behavior.h>
#include <linux/xfs_fs_subr.h>
#include <linux/xfs_xattr.h>
#include <linux/dmapi.h>
#include <linux/dmapi_kern.h>

#ifndef STATIC
#define STATIC static
#endif

typedef struct pathname {
	char	*pn_path;	/* remaining pathname */
	u_long	pn_hash;	/* last component's hash */
	u_short	pn_complen;	/* last component length */
} pathname_t;

typedef struct statvfs {
	ulong_t	f_bsize;	/* fundamental file system block size */
	ulong_t	f_frsize;	/* fragment size */
	__uint64_t f_blocks;	/* total # of blocks of f_frsize on fs */
	__uint64_t f_bfree;	/* total # of free blocks of f_frsize */
	__uint64_t f_bavail;	/* # of free blocks avail to non-superuser */
	__uint64_t f_files;	/* total # of file nodes (inodes) */
	__uint64_t f_ffree;	/* total # of free file nodes */
	__uint64_t f_favail;	/* # of free nodes avail to non-superuser */
	ulong_t	f_namemax;	/* maximum file name length */
	ulong_t	f_fsid;		/* file system id (dev for now) */
	char	f_basetype[16];	/* target fs type name, null-terminated */
	char	f_fstr[32];	/* filesystem-specific string */
} statvfs_t;

typedef struct xfs_dirent {		/* data from readdir() */
	xfs_ino_t d_ino;	/* inode number of entry */
	xfs_off_t d_off;	/* offset of disk directory entry */
	unsigned short d_reclen;/* length of this record */
	char d_name[1];		/* name of file */
} xfs_dirent_t;

typedef struct xfs_dirent32 {	/* Irix5 view of dirent structure */
	app32_ulong_t d_ino;	/* inode number of entry */
	xfs32_off_t d_off;	/* offset of disk directory entry */
	unsigned short d_reclen;/* length of this record */
	char d_name[1];		/* name of file */
} xfs_dirent32_t;

#define GETDENTS_ABI(abi, uiop)	1
#define DIRENTBASESIZE		(((xfs_dirent_t *)0)->d_name - (char *)0)
#define DIRENTSIZE(namelen)	\
	((DIRENTBASESIZE + (namelen) + \
		sizeof(xfs_off_t)) & ~(sizeof(xfs_off_t) - 1))
#define DIRENT32BASESIZE	(((xfs_dirent32_t *)0)->d_name - (char *)0)
#define DIRENT32SIZE(namelen) \
	((DIRENT32BASESIZE + (namelen) + \
		sizeof(xfs32_off_t)) & ~(sizeof(xfs32_off_t) - 1))

#define ABI_IRIX5	0x02	/* an IRIX5/SVR4 ABI binary */
#define ABI_IRIX5_64	0x04	/* an IRIX5-64 bit binary */
#define ABI_IRIX5_N32	0x08	/* an IRIX5-32 bit binary (new abi) */

#define ABI_IS(set,abi)		(((set) & (abi)) != 0)
#define ABI_IS_IRIX5(abi)	(ABI_IS(ABI_IRIX5, abi))
#define ABI_IS_IRIX5_N32(abi)	(ABI_IS(ABI_IRIX5_N32, abi))
#define ABI_IS_IRIX5_64(abi)	(ABI_IS(ABI_IRIX5_64, abi))
#define ABI_IS_IRIX5_N32(abi)	(ABI_IS(ABI_IRIX5_N32, abi))
/* try 64 bit first */
#define get_current_abi()	ABI_IRIX5_64

#define _PAGESZ		PAGE_SIZE
#define NBPP		PAGE_SIZE 
#define DPPSHFT		(PAGE_SHIFT - 9)
#define NDPP		(1 << (PAGE_SHIFT - 9))
#define dtop(DD)	(((DD) + NDPP - 1) >> DPPSHFT)
#define dtopt(DD)	((DD) >> DPPSHFT)
#define dpoff(DD)	((DD) & (NDPP-1))
#define NBBY    8       /* number of bits per byte */

/*
 * Size of block device i/o is parameterized here.
 * Currently the system supports page-sized i/o.
 */
#define	BLKDEV_IOSHIFT		BPCSHIFT
#define	BLKDEV_IOSIZE		(1<<BLKDEV_IOSHIFT)
/* number of BB's per block device block */
#define	BLKDEV_BB		BTOBB(BLKDEV_IOSIZE)

#define	NBPC		_PAGESZ	/* Number of bytes per click */

#if	NBPC == 4096
#define	BPCSHIFT	12	/* LOG2(NBPC) if exact */
#define CPSSHIFT	10	/* LOG2(NCPS) if exact */
#endif
#if	NBPC == 8192
#define	BPCSHIFT	13	/* LOG2(NBPC) if exact */
#define CPSSHIFT	11	/* LOG2(NCPS) if exact */
#endif
#if	NBPC == 16384
#define	BPCSHIFT	14	/* LOG2(NBPC) if exact */
#ifndef	PTE_64BIT
#define CPSSHIFT	12	/* LOG2(NCPS) if exact */
#else	/* PTE_64BIT */
#define CPSSHIFT	11	/* LOG2(NCPS) if exact */
#endif	/* PTE_64BIT */
#endif

/* bytes to clicks */
#ifdef BPCSHIFT
#define	btoc(x)		(((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
#define	btoct(x)	((__psunsigned_t)(x)>>BPCSHIFT)
#define	btoc64(x)	(((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
#define	btoct64(x)	((__uint64_t)(x)>>BPCSHIFT)
#define	io_btoc(x)	(((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
#define	io_btoct(x)	((__psunsigned_t)(x)>>IO_BPCSHIFT)
#else
#define	btoc(x)		(((__psunsigned_t)(x)+(NBPC-1))/NBPC)
#define	btoct(x)	((__psunsigned_t)(x)/NBPC)
#define	btoc64(x)	(((__uint64_t)(x)+(NBPC-1))/NBPC)
#define	btoct64(x)	((__uint64_t)(x)/NBPC)
#define	io_btoc(x)	(((__psunsigned_t)(x)+(IO_NBPC-1))/IO_NBPC)
#define	io_btoct(x)	((__psunsigned_t)(x)/IO_NBPC)
#endif

/* off_t bytes to clicks */
#ifdef BPCSHIFT
#define offtoc(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
#define offtoct(x)      ((xfs_off_t)(x)>>BPCSHIFT)
#else
#define offtoc(x)       (((__uint64_t)(x)+(NBPC-1))/NBPC)
#define offtoct(x)      ((xfs_off_t)(x)/NBPC)
#endif

/* clicks to off_t bytes */
#ifdef BPCSHIFT
#define	ctooff(x)	((xfs_off_t)(x)<<BPCSHIFT)
#else
#define	ctooff(x)	((xfs_off_t)(x)*NBPC)
#endif

/* clicks to bytes */
#ifdef BPCSHIFT
#define	ctob(x)		((__psunsigned_t)(x)<<BPCSHIFT)
#define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
#define	ctob64(x)	((__uint64_t)(x)<<BPCSHIFT)
#define	io_ctob(x)	((__psunsigned_t)(x)<<IO_BPCSHIFT)
#else
#define	ctob(x)		((__psunsigned_t)(x)*NBPC)
#define btoct(x)        ((__psunsigned_t)(x)/NBPC)
#define	ctob64(x)	((__uint64_t)(x)*NBPC)
#define	io_ctob(x)	((__psunsigned_t)(x)*IO_NBPC)
#endif

/* bytes to clicks */
#ifdef BPCSHIFT
#define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
#else
#define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))/NBPC)
#endif

#ifndef CELL_CAPABLE
#define CELL_ONLY(x)
#define CELL_NOT(x)	(x)
#define CELL_IF(a, b)	(b)
#define CELL_MUST(a)   	ASSERT(0)
#define CELL_ASSERT(x)
#define FSC_NOTIFY_NAME_CHANGED(vp)
#endif

#ifndef ENOTSUP
#define ENOTSUP		EOPNOTSUPP	/* Not supported (POSIX 1003.1b) */
#endif

#ifndef ENOATTR
#define ENOATTR		ENODATA		/* Attribute not found */
#endif

/* Note: EWRONGFS never visible outside the kernel */
#define	EWRONGFS	EINVAL		/* Mount with wrong filesystem type */

/*
 * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
 *     return codes out of its known range in errno.
 * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
 *     conflict with any code we use already or any code a driver may use)
 * XXX Some options (currently we do #2):
 *	1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
 *	2/ 990 ["Unknown error 990"]
 *	3/ EUCLEAN ["Structure needs cleaning"]
 *	4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
 */
#define EFSCORRUPTED    990		/* Filesystem is corrupted */

#define SYNCHRONIZE()	barrier()
#define lbolt		jiffies
#define rootdev		ROOT_DEV
#define __return_address __builtin_return_address(0)
#define LONGLONG_MAX	9223372036854775807LL	/* max "long long int" */
#define nopkg()		( ENOSYS )
#define getf(fd,fpp)	( printk("getf not implemented\n"), ASSERT(0), 0 )

/* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */
/* we may well need to fine-tune this if it ever becomes an issue.  */
#define DQUOT_MAX_HEURISTIC	1024	/* NR_DQUOTS */
#define ndquot			DQUOT_MAX_HEURISTIC

/* IRIX uses the current size of the name cache to guess a good value */
/* - this isn't the same but is a good enough starting point for now. */
#define DQUOT_HASH_HEURISTIC	files_stat.nr_files

/* IRIX inodes maintain the project ID also, zero this field on Linux */
#define DEFAULT_PROJID	0
#define dfltprid	DEFAULT_PROJID

#define MAXNAMELEN      256
#define	MAXPATHLEN	1024

#define	PSWP	0
#define PMEM	0
#define PINOD   10
#define PRIBIO  20

#define	PLTWAIT 0x288 /* O'01000' */
#define	PVFS	27

#define FREAD		0x01
#define FWRITE		0x02
#define FINVIS		0x0100	/* don't update timestamps - XFS */
#define FSOCKET		0x0200	/* open file refers to a vsocket */

#define MIN(a,b)	(min(a,b))
#define MAX(a,b)	(max(a,b))
#define howmany(x, y)   (((x)+((y)-1))/(y))
#define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))

/* Move the kernel do_div definition off to one side */

#if defined __i386__
/* For ia32 we need to pull some tricks to get past various versions
 * of the compiler which do not like us using do_div in the middle
 * of large functions.
 */
static inline __u32 xfs_do_div(void *a, __u32 b, int n)
{
	__u32	mod;

	switch (n) {
		case 4:
			mod = *(__u32 *)a % b;
			*(__u32 *)a = *(__u32 *)a / b;
			return mod;
		case 8:
			{
			unsigned long __upper, __low, __high, __mod;
			__u64	c = *(__u64 *)a;
			__upper = __high = c >> 32;
			__low = c;
			if (__high) {
				__upper = __high % (b);
				__high = __high / (b);
			}
			asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
			asm("":"=A" (c):"a" (__low),"d" (__high));
			*(__u64 *)a = c;
			return __mod;
			}
	}

	/* NOTREACHED */
	return 0;
}

/* Side effect free 64 bit mod operation */
static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
{
	switch (n) {
		case 4:
			return *(__u32 *)a % b;
		case 8:
			{
			unsigned long __upper, __low, __high, __mod;
			__u64	c = *(__u64 *)a;
			__upper = __high = c >> 32;
			__low = c;
			if (__high) {
				__upper = __high % (b);
				__high = __high / (b);
			}
			asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
			asm("":"=A" (c):"a" (__low),"d" (__high));
			return __mod;
			}
	}

	/* NOTREACHED */
	return 0;
}
#else
static inline __u32 xfs_do_div(void *a, __u32 b, int n)
{
	__u32	mod;

	switch (n) {
		case 4:
			mod = *(__u32 *)a % b;
			*(__u32 *)a = *(__u32 *)a / b;
			return mod;
		case 8:
			mod = do_div(*(__u64 *)a, b);
			return mod;
	}

	/* NOTREACHED */
	return 0;
}

/* Side effect free 64 bit mod operation */
static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
{
	switch (n) {
		case 4:
			return *(__u32 *)a % b;
		case 8:
			{
			__u64	c = *(__u64 *)a;
			return do_div(c, b);
			}
	}

	/* NOTREACHED */
	return 0;
}
#endif

#undef do_div
#define do_div(a, b)	xfs_do_div(&(a), (b), sizeof(a))
#define do_mod(a, b)	xfs_do_mod(&(a), (b), sizeof(a))

extern inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
{
	x += y - 1;
	do_div(x, y);
	return(x * y);
}

#endif /* __XFS_LINUX__ */