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Symlinks are created by default with mode 777 now, old behavior is still
accessible through sysctl through.  irixsgid mount option deprecated and
it too is still accessible through sysctl.
Merge of 2.4.x-xfs:slinx:129282a by nathans.

  Make restricted_chown, irix_sgid_inherit and irix_symlink_mode as
  configurable parameters.

/*
 * Copyright (c) 2000-2002 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/mm.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/file.h>
#include <linux/swap.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/bitops.h>
#include <linux/major.h>
#include <linux/root_dev.h>

#include <asm/page.h>
#include <asm/div64.h>
#include <asm/param.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include <linux/xfs_behavior.h>
#include <linux/xfs_vfs.h>
#include <linux/xfs_cred.h>
#include <linux/xfs_vnode.h>
#include <linux/xfs_stats.h>
#include <linux/xfs_sysctl.h>
#include <linux/xfs_iops.h>
#include <linux/xfs_super.h>
#include <linux/xfs_globals.h>
#include <linux/xfs_fs_subr.h>

#include <pagebuf/page_buf.h>

#ifndef STATIC
#define STATIC static
#endif

#define restricted_chown	xfs_params.restrict_chown
#define irix_sgid_inherit	xfs_params.sgid_inherit
#define irix_symlink_mode	xfs_params.symlink_mode

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;

#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 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 */
#define NBPC		PAGE_SIZE	/* Number of bytes per click */
#define BPCSHIFT	PAGE_SHIFT	/* LOG2(NBPC) if exact */

/*
 * 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)

/* bytes to clicks */
#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)

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

/* clicks to off_t bytes */
#define ctooff(x)	((xfs_off_t)(x)<<BPCSHIFT)

/* clicks to bytes */
#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)

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

#ifndef CELL_CAPABLE
#define FSC_NOTIFY_NAME_CHANGED(vp)
#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 )

/* 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 FINVIS		0x0100	/* don't update timestamps - XFS */

#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))

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

#endif /* __XFS_LINUX__ */