[deliverable/linux.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>
#include <linux/config.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 <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_SENDFILE	/* sendfile(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

/*
 * State flag for unwritten extent buffers.
 *
 * We need to be able to distinguish between these and delayed
 * allocate buffers within XFS.  The generic IO path code does
 * not need to distinguish - we use the BH_Delay flag for both
 * delalloc and these ondisk-uninitialised buffers.
 */
BUFFER_FNS(PrivateStart, unwritten);

#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

#ifndef raw_smp_processor_id
#define raw_smp_processor_id()	smp_processor_id()
#endif
#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 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 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 __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))
#define roundup(x, y)	((((x)+((y)-1))/(y))*(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(LINVFS_GET_IP(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);
}

#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>
	22	#include <linux/config.h>
	23
	24	/*
	25	* Some types are conditional depending on the target system.
	26	* XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
	27	* XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
	28	* as requiring XFS_BIG_BLKNOS to be set.
	29	*/
	30	#if defined(CONFIG_LBD) \|\| (BITS_PER_LONG == 64)
	31	# define XFS_BIG_BLKNOS 1
	32	# if BITS_PER_LONG == 64
	33	# define XFS_BIG_INUMS 1
	34	# else
	35	# define XFS_BIG_INUMS 0
	36	# endif
	37	#else
	38	# define XFS_BIG_BLKNOS 0
	39	# define XFS_BIG_INUMS 0
	40	#endif
	41
	42	#include <xfs_types.h>
	43	#include <xfs_arch.h>
	44
	45	#include <kmem.h>
	46	#include <mrlock.h>
	47	#include <spin.h>
	48	#include <sv.h>
	49	#include <mutex.h>
	50	#include <sema.h>
	51	#include <time.h>
	52
1da177e4 LT	53	#include <support/ktrace.h>
	54	#include <support/debug.h>
	55	#include <support/move.h>
	56	#include <support/uuid.h>
	57
	58	#include <linux/mm.h>
	59	#include <linux/kernel.h>
	60	#include <linux/blkdev.h>
	61	#include <linux/slab.h>
	62	#include <linux/module.h>
	63	#include <linux/file.h>
	64	#include <linux/swap.h>
	65	#include <linux/errno.h>
	66	#include <linux/sched.h>
	67	#include <linux/bitops.h>
	68	#include <linux/major.h>
	69	#include <linux/pagemap.h>
	70	#include <linux/vfs.h>
	71	#include <linux/seq_file.h>
	72	#include <linux/init.h>
	73	#include <linux/list.h>
	74	#include <linux/proc_fs.h>
1da177e4	75	#include <linux/sort.h>
e8234a68 DC	76	#include <linux/cpu.h>
e8234a68 DC	77	#include <linux/notifier.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 */
	104	#define HAVE_SENDFILE /* sendfile(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 LT	110
	111	/*
	112	* State flag for unwritten extent buffers.
	113	*
	114	* We need to be able to distinguish between these and delayed
	115	* allocate buffers within XFS. The generic IO path code does
	116	* not need to distinguish - we use the BH_Delay flag for both
	117	* delalloc and these ondisk-uninitialised buffers.
	118	*/
	119	BUFFER_FNS(PrivateStart, unwritten);
1da177e4 LT	120
	121	#define restricted_chown xfs_params.restrict_chown.val
	122	#define irix_sgid_inherit xfs_params.sgid_inherit.val
	123	#define irix_symlink_mode xfs_params.symlink_mode.val
	124	#define xfs_panic_mask xfs_params.panic_mask.val
	125	#define xfs_error_level xfs_params.error_level.val
	126	#define xfs_syncd_centisecs xfs_params.syncd_timer.val
	127	#define xfs_stats_clear xfs_params.stats_clear.val
	128	#define xfs_inherit_sync xfs_params.inherit_sync.val
	129	#define xfs_inherit_nodump xfs_params.inherit_nodump.val
	130	#define xfs_inherit_noatime xfs_params.inherit_noatim.val
	131	#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
	132	#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
	133	#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
	134	#define xfs_rotorstep xfs_params.rotorstep.val
	135
39c715b7 IM	136	#ifndef raw_smp_processor_id
39c715b7 IM	137	#define raw_smp_processor_id() smp_processor_id()
1da177e4	138	#endif
39c715b7	139	#define current_cpu() raw_smp_processor_id()
1da177e4 LT	140	#define current_pid() (current->pid)
	141	#define current_fsuid(cred) (current->fsuid)
	142	#define current_fsgid(cred) (current->fsgid)
	143
	144	#define NBPP PAGE_SIZE
	145	#define DPPSHFT (PAGE_SHIFT - 9)
	146	#define NDPP (1 << (PAGE_SHIFT - 9))
	147	#define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
	148	#define dtopt(DD) ((DD) >> DPPSHFT)
	149	#define dpoff(DD) ((DD) & (NDPP-1))
	150
	151	#define NBBY 8 /* number of bits per byte */
	152	#define NBPC PAGE_SIZE /* Number of bytes per click */
	153	#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
	154
	155	/*
	156	* Size of block device i/o is parameterized here.
	157	* Currently the system supports page-sized i/o.
	158	*/
	159	#define BLKDEV_IOSHIFT BPCSHIFT
	160	#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
	161	/* number of BB's per block device block */
	162	#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
	163
	164	/* bytes to clicks */
	165	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
	166	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
	167	#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
	168	#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
	169	#define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
	170	#define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
	171
	172	/* off_t bytes to clicks */
	173	#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
	174	#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
	175
	176	/* clicks to off_t bytes */
	177	#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
	178
	179	/* clicks to bytes */
	180	#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
	181	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
	182	#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
	183	#define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
	184
	185	/* bytes to clicks */
	186	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
	187
1da177e4 LT	188	#ifndef ENOATTR
	189	#define ENOATTR ENODATA /* Attribute not found */
	190	#endif
	191
	192	/* Note: EWRONGFS never visible outside the kernel */
	193	#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
	194
	195	/*
	196	* XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
	197	* return codes out of its known range in errno.
	198	* XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
	199	* conflict with any code we use already or any code a driver may use)
	200	* XXX Some options (currently we do #2):
	201	* 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
	202	* 2/ 990 ["Unknown error 990"]
	203	* 3/ EUCLEAN ["Structure needs cleaning"]
	204	* 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
	205	*/
	206	#define EFSCORRUPTED 990 /* Filesystem is corrupted */
	207
	208	#define SYNCHRONIZE() barrier()
	209	#define __return_address __builtin_return_address(0)
	210
	211	/*
	212	* IRIX (BSD) quotactl makes use of separate commands for user/group,
	213	* whereas on Linux the syscall encodes this information into the cmd
	214	* field (see the QCMD macro in quota.h). These macros help keep the
	215	* code portable - they are not visible from the syscall interface.
	216	*/
c8ad20ff NS	217	#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
	218	#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
	219	#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
	220	#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
1da177e4	221
6b3f6b5b	222	#define dfltprid 0
1da177e4 LT	223	#define MAXPATHLEN 1024
	224
	225	#define MIN(a,b) (min(a,b))
	226	#define MAX(a,b) (max(a,b))
	227	#define howmany(x, y) (((x)+((y)-1))/(y))
	228	#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
	229
cde410a9 NS	230	/*
	231	* Various platform dependent calls that don't fit anywhere else
	232	*/
380b5dc0	233	#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
1da177e4	234	#define xfs_stack_trace() dump_stack()
1da177e4 LT	235	#define xfs_itruncate_data(ip, off) \
1da177e4 LT	236	(-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
cde410a9	237	#define xfs_statvfs_fsid(statp, mp) \
ce8e922c	238	({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
cde410a9 NS	239	__kernel_fsid_t *fsid = &(statp)->f_fsid; \
cde410a9 NS	240	(fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
1da177e4 LT	241
	242
	243	/* Move the kernel do_div definition off to one side */
	244
	245	#if defined __i386__
	246	/* For ia32 we need to pull some tricks to get past various versions
	247	* of the compiler which do not like us using do_div in the middle
	248	* of large functions.
	249	*/
	250	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
	251	{
	252	__u32 mod;
	253
	254	switch (n) {
	255	case 4:
	256	mod = (__u32 )a % b;
	257	(__u32 )a = (__u32 )a / b;
	258	return mod;
	259	case 8:
	260	{
	261	unsigned long __upper, __low, __high, __mod;
	262	__u64 c = (__u64 )a;
	263	__upper = __high = c >> 32;
	264	__low = c;
	265	if (__high) {
	266	__upper = __high % (b);
	267	__high = __high / (b);
	268	}
	269	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
	270	asm("":"=A" (c):"a" (__low),"d" (__high));
	271	(__u64 )a = c;
	272	return __mod;
	273	}
	274	}
	275
	276	/* NOTREACHED */
	277	return 0;
	278	}
	279
	280	/* Side effect free 64 bit mod operation */
	281	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
	282	{
	283	switch (n) {
	284	case 4:
	285	return (__u32 )a % b;
	286	case 8:
	287	{
	288	unsigned long __upper, __low, __high, __mod;
	289	__u64 c = (__u64 )a;
	290	__upper = __high = c >> 32;
	291	__low = c;
	292	if (__high) {
	293	__upper = __high % (b);
	294	__high = __high / (b);
	295	}
	296	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
	297	asm("":"=A" (c):"a" (__low),"d" (__high));
	298	return __mod;
	299	}
	300	}
	301
	302	/* NOTREACHED */
	303	return 0;
	304	}
305	#else
306	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
307	{
308	__u32 mod;
309
310	switch (n) {
311	case 4:
312	mod = (__u32 )a % b;
313	(__u32 )a = (__u32 )a / b;
314	return mod;
315	case 8:
316	mod = do_div((__u64 )a, b);
317	return mod;
318	}
319
320	/* NOTREACHED */
321	return 0;
322	}
323
324	/* Side effect free 64 bit mod operation */
325	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
326	{
327	switch (n) {
328	case 4:
329	return (__u32 )a % b;
330	case 8:
331	{
332	__u64 c = (__u64 )a;
333	return do_div(c, b);
334	}
335	}
336
337	/* NOTREACHED */
338	return 0;
339	}
340	#endif
341
342	#undef do_div
343	#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
344	#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
345
346	static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
347	{
348	x += y - 1;
349	do_div(x, y);
350	return(x * y);
351	}
352
1da177e4	353	#endif /* __XFS_LINUX__ */