[mirror_ubuntu-bionic-kernel.git] / fs / xfs / linux-2.6 / xfs_linux.h

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_LINUX__
#define __XFS_LINUX__

#include <linux/types.h>

/*
 * Some types are conditional depending on the target system.
 * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
 * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
 * as requiring XFS_BIG_BLKNOS to be set.
 */
#if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
# define XFS_BIG_BLKNOS	1
# if BITS_PER_LONG == 64
#  define XFS_BIG_INUMS	1
# else
#  define XFS_BIG_INUMS	0
# endif
#else
# define XFS_BIG_BLKNOS	0
# define XFS_BIG_INUMS	0
#endif

#include <xfs_types.h>
#include <xfs_arch.h>

#include <kmem.h>
#include <mrlock.h>
#include <spin.h>
#include <sv.h>
#include <mutex.h>
#include <sema.h>
#include <time.h>

#include <support/ktrace.h>
#include <support/debug.h>
#include <support/move.h>
#include <support/uuid.h>

#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/blkdev.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/pagemap.h>
#include <linux/vfs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/sort.h>
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/delay.h>

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

#include <xfs_behavior.h>
#include <xfs_vfs.h>
#include <xfs_cred.h>
#include <xfs_vnode.h>
#include <xfs_stats.h>
#include <xfs_sysctl.h>
#include <xfs_iops.h>
#include <xfs_aops.h>
#include <xfs_super.h>
#include <xfs_globals.h>
#include <xfs_fs_subr.h>
#include <xfs_lrw.h>
#include <xfs_buf.h>

/*
 * Feature macros (disable/enable)
 */
#undef  HAVE_REFCACHE	/* reference cache not needed for NFS in 2.6 */
#define HAVE_SPLICE	/* a splice(2) exists in 2.6, but not in 2.4 */
#ifdef CONFIG_SMP
#define HAVE_PERCPU_SB	/* per cpu superblock counters are a 2.6 feature */
#else
#undef  HAVE_PERCPU_SB	/* per cpu superblock counters are a 2.6 feature */
#endif

#define restricted_chown	xfs_params.restrict_chown.val
#define irix_sgid_inherit	xfs_params.sgid_inherit.val
#define irix_symlink_mode	xfs_params.symlink_mode.val
#define xfs_panic_mask		xfs_params.panic_mask.val
#define xfs_error_level		xfs_params.error_level.val
#define xfs_syncd_centisecs	xfs_params.syncd_timer.val
#define xfs_stats_clear		xfs_params.stats_clear.val
#define xfs_inherit_sync	xfs_params.inherit_sync.val
#define xfs_inherit_nodump	xfs_params.inherit_nodump.val
#define xfs_inherit_noatime	xfs_params.inherit_noatim.val
#define xfs_buf_timer_centisecs	xfs_params.xfs_buf_timer.val
#define xfs_buf_age_centisecs	xfs_params.xfs_buf_age.val
#define xfs_inherit_nosymlinks	xfs_params.inherit_nosym.val
#define xfs_rotorstep		xfs_params.rotorstep.val
#define xfs_inherit_nodefrag	xfs_params.inherit_nodfrg.val
#define xfs_fstrm_centisecs	xfs_params.fstrm_timer.val

#define current_cpu()		(raw_smp_processor_id())
#define current_pid()		(current->pid)
#define current_fsuid(cred)	(current->fsuid)
#define current_fsgid(cred)	(current->fsgid)
#define current_test_flags(f)	(current->flags & (f))
#define current_set_flags_nested(sp, f)		\
		(*(sp) = current->flags, current->flags |= (f))
#define current_clear_flags_nested(sp, f)	\
		(*(sp) = current->flags, current->flags &= ~(f))
#define current_restore_flags_nested(sp, f)	\
		(current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))

#define NBPP		PAGE_SIZE
#define NDPP		(1 << (PAGE_SHIFT - 9))

#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)

/* 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)

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

#define ENOATTR		ENODATA		/* Attribute not found */
#define EWRONGFS	EINVAL		/* Mount with wrong filesystem type */
#define EFSCORRUPTED	EUCLEAN		/* Filesystem is corrupted */

#define SYNCHRONIZE()	barrier()
#define __return_address __builtin_return_address(0)

/*
 * IRIX (BSD) quotactl makes use of separate commands for user/group,
 * whereas on Linux the syscall encodes this information into the cmd
 * field (see the QCMD macro in quota.h).  These macros help keep the
 * code portable - they are not visible from the syscall interface.
 */
#define Q_XSETGQLIM	XQM_CMD(8)	/* set groups disk limits */
#define Q_XGETGQUOTA	XQM_CMD(9)	/* get groups disk limits */
#define Q_XSETPQLIM	XQM_CMD(10)	/* set projects disk limits */
#define Q_XGETPQUOTA	XQM_CMD(11)	/* get projects disk limits */

#define dfltprid	0
#define MAXPATHLEN	1024

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

/*
 * Various platform dependent calls that don't fit anywhere else
 */
#define xfs_sort(a,n,s,fn)	sort(a,n,s,fn,NULL)
#define xfs_stack_trace()	dump_stack()
#define xfs_itruncate_data(ip, off)	\
	(-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
#define xfs_statvfs_fsid(statp, mp)	\
	({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
	   __kernel_fsid_t *fsid = &(statp)->f_fsid;	\
	(fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })


/* 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);
}

static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
{
	x += y - 1;
	do_div(x, y);
	return x;
}

#endif /* __XFS_LINUX__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_LINUX__
	19	#define __XFS_LINUX__
	20
	21	#include <linux/types.h>
1da177e4 LT	22
	23	/*
	24	* Some types are conditional depending on the target system.
	25	* XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
	26	* XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
	27	* as requiring XFS_BIG_BLKNOS to be set.
	28	*/
	29	#if defined(CONFIG_LBD) \|\| (BITS_PER_LONG == 64)
	30	# define XFS_BIG_BLKNOS 1
	31	# if BITS_PER_LONG == 64
	32	# define XFS_BIG_INUMS 1
	33	# else
	34	# define XFS_BIG_INUMS 0
	35	# endif
	36	#else
	37	# define XFS_BIG_BLKNOS 0
	38	# define XFS_BIG_INUMS 0
	39	#endif
	40
	41	#include <xfs_types.h>
	42	#include <xfs_arch.h>
	43
	44	#include <kmem.h>
	45	#include <mrlock.h>
	46	#include <spin.h>
	47	#include <sv.h>
	48	#include <mutex.h>
	49	#include <sema.h>
	50	#include <time.h>
	51
1da177e4 LT	52	#include <support/ktrace.h>
	53	#include <support/debug.h>
	54	#include <support/move.h>
	55	#include <support/uuid.h>
	56
	57	#include <linux/mm.h>
	58	#include <linux/kernel.h>
	59	#include <linux/blkdev.h>
	60	#include <linux/slab.h>
	61	#include <linux/module.h>
	62	#include <linux/file.h>
	63	#include <linux/swap.h>
	64	#include <linux/errno.h>
	65	#include <linux/sched.h>
	66	#include <linux/bitops.h>
	67	#include <linux/major.h>
	68	#include <linux/pagemap.h>
	69	#include <linux/vfs.h>
	70	#include <linux/seq_file.h>
	71	#include <linux/init.h>
	72	#include <linux/list.h>
	73	#include <linux/proc_fs.h>
1da177e4	74	#include <linux/sort.h>
e8234a68 DC	75	#include <linux/cpu.h>
e8234a68 DC	76	#include <linux/notifier.h>
01e1b69c	77	#include <linux/delay.h>
1da177e4 LT	78
	79	#include <asm/page.h>
	80	#include <asm/div64.h>
	81	#include <asm/param.h>
	82	#include <asm/uaccess.h>
	83	#include <asm/byteorder.h>
	84	#include <asm/unaligned.h>
	85
	86	#include <xfs_behavior.h>
	87	#include <xfs_vfs.h>
	88	#include <xfs_cred.h>
	89	#include <xfs_vnode.h>
	90	#include <xfs_stats.h>
	91	#include <xfs_sysctl.h>
	92	#include <xfs_iops.h>
0829c360	93	#include <xfs_aops.h>
1da177e4 LT	94	#include <xfs_super.h>
	95	#include <xfs_globals.h>
	96	#include <xfs_fs_subr.h>
	97	#include <xfs_lrw.h>
	98	#include <xfs_buf.h>
	99
	100	/*
	101	* Feature macros (disable/enable)
	102	*/
	103	#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
1b895840	104	#define HAVE_SPLICE /* a splice(2) exists in 2.6, but not in 2.4 */
d2c32edf	105	#ifdef CONFIG_SMP
8d280b98 DC	106	#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
	107	#else
	108	#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
	109	#endif
1da177e4	110
1da177e4 LT	111	#define restricted_chown xfs_params.restrict_chown.val
	112	#define irix_sgid_inherit xfs_params.sgid_inherit.val
	113	#define irix_symlink_mode xfs_params.symlink_mode.val
	114	#define xfs_panic_mask xfs_params.panic_mask.val
	115	#define xfs_error_level xfs_params.error_level.val
	116	#define xfs_syncd_centisecs xfs_params.syncd_timer.val
	117	#define xfs_stats_clear xfs_params.stats_clear.val
	118	#define xfs_inherit_sync xfs_params.inherit_sync.val
	119	#define xfs_inherit_nodump xfs_params.inherit_nodump.val
	120	#define xfs_inherit_noatime xfs_params.inherit_noatim.val
	121	#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
	122	#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
	123	#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
	124	#define xfs_rotorstep xfs_params.rotorstep.val
d3446eac	125	#define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
2a82b8be	126	#define xfs_fstrm_centisecs xfs_params.fstrm_timer.val
1da177e4	127
59c1b082	128	#define current_cpu() (raw_smp_processor_id())
1da177e4 LT	129	#define current_pid() (current->pid)
	130	#define current_fsuid(cred) (current->fsuid)
	131	#define current_fsgid(cred) (current->fsgid)
59c1b082	132	#define current_test_flags(f) (current->flags & (f))
59c1b082 NS	133	#define current_set_flags_nested(sp, f) \
	134	(*(sp) = current->flags, current->flags \|= (f))
	135	#define current_clear_flags_nested(sp, f) \
	136	(*(sp) = current->flags, current->flags &= ~(f))
	137	#define current_restore_flags_nested(sp, f) \
	138	(current->flags = ((current->flags & ~(f)) \| (*(sp) & (f))))
1da177e4 LT	139
1da177e4 LT	140	#define NBPP PAGE_SIZE
1da177e4	141	#define NDPP (1 << (PAGE_SHIFT - 9))
1da177e4 LT	142
	143	#define NBBY 8 /* number of bits per byte */
	144	#define NBPC PAGE_SIZE /* Number of bytes per click */
	145	#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
	146
	147	/*
	148	* Size of block device i/o is parameterized here.
	149	* Currently the system supports page-sized i/o.
	150	*/
	151	#define BLKDEV_IOSHIFT BPCSHIFT
	152	#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
	153	/* number of BB's per block device block */
	154	#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
	155
	156	/* bytes to clicks */
	157	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
	158	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
	159	#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
	160	#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
1da177e4 LT	161
	162	/* off_t bytes to clicks */
	163	#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
	164	#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
	165
	166	/* clicks to off_t bytes */
	167	#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
	168
	169	/* clicks to bytes */
	170	#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
	171	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
	172	#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
1da177e4 LT	173
	174	/* bytes to clicks */
	175	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
	176
1da177e4	177	#define ENOATTR ENODATA /* Attribute not found */
da2f4d67 NS	178	#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
da2f4d67 NS	179	#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
1da177e4 LT	180
	181	#define SYNCHRONIZE() barrier()
	182	#define __return_address __builtin_return_address(0)
	183
	184	/*
	185	* IRIX (BSD) quotactl makes use of separate commands for user/group,
	186	* whereas on Linux the syscall encodes this information into the cmd
	187	* field (see the QCMD macro in quota.h). These macros help keep the
	188	* code portable - they are not visible from the syscall interface.
	189	*/
c8ad20ff NS	190	#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
	191	#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
	192	#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
	193	#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
1da177e4	194
6b3f6b5b	195	#define dfltprid 0
1da177e4 LT	196	#define MAXPATHLEN 1024
	197
	198	#define MIN(a,b) (min(a,b))
	199	#define MAX(a,b) (max(a,b))
	200	#define howmany(x, y) (((x)+((y)-1))/(y))
1da177e4	201
cde410a9 NS	202	/*
	203	* Various platform dependent calls that don't fit anywhere else
	204	*/
380b5dc0	205	#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
1da177e4	206	#define xfs_stack_trace() dump_stack()
1da177e4	207	#define xfs_itruncate_data(ip, off) \
ec86dc02	208	(-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
cde410a9	209	#define xfs_statvfs_fsid(statp, mp) \
ce8e922c	210	({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
cde410a9 NS	211	__kernel_fsid_t *fsid = &(statp)->f_fsid; \
cde410a9 NS	212	(fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
1da177e4 LT	213
	214
	215	/* Move the kernel do_div definition off to one side */
	216
	217	#if defined __i386__
	218	/* For ia32 we need to pull some tricks to get past various versions
	219	* of the compiler which do not like us using do_div in the middle
	220	* of large functions.
	221	*/
	222	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
	223	{
	224	__u32 mod;
	225
	226	switch (n) {
	227	case 4:
	228	mod = (__u32 )a % b;
	229	(__u32 )a = (__u32 )a / b;
	230	return mod;
	231	case 8:
	232	{
	233	unsigned long __upper, __low, __high, __mod;
	234	__u64 c = (__u64 )a;
	235	__upper = __high = c >> 32;
	236	__low = c;
	237	if (__high) {
	238	__upper = __high % (b);
	239	__high = __high / (b);
	240	}
	241	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
	242	asm("":"=A" (c):"a" (__low),"d" (__high));
	243	(__u64 )a = c;
	244	return __mod;
	245	}
	246	}
	247
	248	/* NOTREACHED */
	249	return 0;
	250	}
	251
	252	/* Side effect free 64 bit mod operation */
	253	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
	254	{
	255	switch (n) {
	256	case 4:
	257	return (__u32 )a % b;
	258	case 8:
	259	{
	260	unsigned long __upper, __low, __high, __mod;
	261	__u64 c = (__u64 )a;
	262	__upper = __high = c >> 32;
	263	__low = c;
	264	if (__high) {
	265	__upper = __high % (b);
	266	__high = __high / (b);
	267	}
	268	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
	269	asm("":"=A" (c):"a" (__low),"d" (__high));
	270	return __mod;
	271	}
	272	}
	273
	274	/* NOTREACHED */
	275	return 0;
	276	}
277	#else
278	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
279	{
280	__u32 mod;
281
282	switch (n) {
283	case 4:
284	mod = (__u32 )a % b;
285	(__u32 )a = (__u32 )a / b;
286	return mod;
287	case 8:
288	mod = do_div((__u64 )a, b);
289	return mod;
290	}
291
292	/* NOTREACHED */
293	return 0;
294	}
295
296	/* Side effect free 64 bit mod operation */
297	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
298	{
299	switch (n) {
300	case 4:
301	return (__u32 )a % b;
302	case 8:
303	{
304	__u64 c = (__u64 )a;
305	return do_div(c, b);
306	}
307	}
308
309	/* NOTREACHED */
310	return 0;
311	}
312	#endif
313
314	#undef do_div
315	#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
316	#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
317
318	static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
319	{
320	x += y - 1;
321	do_div(x, y);
322	return(x * y);
323	}
324
68c32715 NS	325	static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
	326	{
	327	x += y - 1;
	328	do_div(x, y);
	329	return x;
	330	}
	331
1da177e4	332	#endif /* __XFS_LINUX__ */