[deliverable/linux.git] / fs / xfs / linux-2.6 / xfs_linux.h

/*
 * Copyright (c) 2000-2004 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/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/qsort.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/version.h>
#include <linux/sort.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_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 */

/*
 * 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);
static inline void set_buffer_unwritten_io(struct buffer_head *bh)
{
	bh->b_end_io = linvfs_unwritten_done;
}

#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 __smp_processor_id
#define __smp_processor_id()	smp_processor_id()
#endif
#define current_cpu()		__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 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 __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(0x8)	/* set groups disk limits */
#define Q_XGETGQUOTA	XQM_CMD(0x9)	/* get groups disk limits */

/* 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 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))

#define xfs_stack_trace()	dump_stack()

#define xfs_itruncate_data(ip, off)	\
	(-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))


/* 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);
}

#define qsort(a, n, s, cmp) sort(a, n, s, cmp, NULL)

#endif /* __XFS_LINUX__ */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it would be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	11	*
	12	* Further, this software is distributed without any warranty that it is
	13	* free of the rightful claim of any third person regarding infringement
	14	* or the like. Any license provided herein, whether implied or
	15	* otherwise, applies only to this software file. Patent licenses, if
	16	* any, provided herein do not apply to combinations of this program with
	17	* other software, or any other product whatsoever.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write the Free Software Foundation, Inc., 59
	21	* Temple Place - Suite 330, Boston MA 02111-1307, USA.
	22	*
	23	* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
	24	* Mountain View, CA 94043, or:
	25	*
	26	* http://www.sgi.com
	27	*
	28	* For further information regarding this notice, see:
	29	*
	30	* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
	31	*/
	32	#ifndef __XFS_LINUX__
	33	#define __XFS_LINUX__
	34
	35	#include <linux/types.h>
	36	#include <linux/config.h>
	37
	38	/*
	39	* Some types are conditional depending on the target system.
	40	* XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
	41	* XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
	42	* as requiring XFS_BIG_BLKNOS to be set.
	43	*/
	44	#if defined(CONFIG_LBD) \|\| (BITS_PER_LONG == 64)
	45	# define XFS_BIG_BLKNOS 1
	46	# if BITS_PER_LONG == 64
	47	# define XFS_BIG_INUMS 1
	48	# else
	49	# define XFS_BIG_INUMS 0
	50	# endif
	51	#else
	52	# define XFS_BIG_BLKNOS 0
	53	# define XFS_BIG_INUMS 0
	54	#endif
	55
	56	#include <xfs_types.h>
	57	#include <xfs_arch.h>
	58
	59	#include <kmem.h>
	60	#include <mrlock.h>
	61	#include <spin.h>
	62	#include <sv.h>
	63	#include <mutex.h>
	64	#include <sema.h>
65	#include <time.h>
66
67	#include <support/qsort.h>
68	#include <support/ktrace.h>
69	#include <support/debug.h>
70	#include <support/move.h>
71	#include <support/uuid.h>
72
73	#include <linux/mm.h>
74	#include <linux/kernel.h>
75	#include <linux/blkdev.h>
76	#include <linux/slab.h>
77	#include <linux/module.h>
78	#include <linux/file.h>
79	#include <linux/swap.h>
80	#include <linux/errno.h>
81	#include <linux/sched.h>
82	#include <linux/bitops.h>
83	#include <linux/major.h>
84	#include <linux/pagemap.h>
85	#include <linux/vfs.h>
86	#include <linux/seq_file.h>
87	#include <linux/init.h>
88	#include <linux/list.h>
89	#include <linux/proc_fs.h>
90	#include <linux/version.h>
91	#include <linux/sort.h>
92
93	#include <asm/page.h>
94	#include <asm/div64.h>
95	#include <asm/param.h>
96	#include <asm/uaccess.h>
97	#include <asm/byteorder.h>
98	#include <asm/unaligned.h>
99
100	#include <xfs_behavior.h>
101	#include <xfs_vfs.h>
102	#include <xfs_cred.h>
103	#include <xfs_vnode.h>
104	#include <xfs_stats.h>
105	#include <xfs_sysctl.h>
106	#include <xfs_iops.h>
107	#include <xfs_super.h>
108	#include <xfs_globals.h>
109	#include <xfs_fs_subr.h>
110	#include <xfs_lrw.h>
111	#include <xfs_buf.h>
112
113	/*
114	* Feature macros (disable/enable)
115	*/
116	#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
117	#define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */
118
119	/*
120	* State flag for unwritten extent buffers.
121	*
122	* We need to be able to distinguish between these and delayed
123	* allocate buffers within XFS. The generic IO path code does
124	* not need to distinguish - we use the BH_Delay flag for both
125	* delalloc and these ondisk-uninitialised buffers.
126	*/
127	BUFFER_FNS(PrivateStart, unwritten);
128	static inline void set_buffer_unwritten_io(struct buffer_head *bh)
129	{
130	bh->b_end_io = linvfs_unwritten_done;
131	}
132
133	#define restricted_chown xfs_params.restrict_chown.val
134	#define irix_sgid_inherit xfs_params.sgid_inherit.val
135	#define irix_symlink_mode xfs_params.symlink_mode.val
136	#define xfs_panic_mask xfs_params.panic_mask.val
137	#define xfs_error_level xfs_params.error_level.val
138	#define xfs_syncd_centisecs xfs_params.syncd_timer.val
139	#define xfs_stats_clear xfs_params.stats_clear.val
140	#define xfs_inherit_sync xfs_params.inherit_sync.val
141	#define xfs_inherit_nodump xfs_params.inherit_nodump.val
142	#define xfs_inherit_noatime xfs_params.inherit_noatim.val
143	#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
144	#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
145	#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
146	#define xfs_rotorstep xfs_params.rotorstep.val
147
148	#ifndef __smp_processor_id
149	#define __smp_processor_id() smp_processor_id()
150	#endif
151	#define current_cpu() __smp_processor_id()
152	#define current_pid() (current->pid)
153	#define current_fsuid(cred) (current->fsuid)
154	#define current_fsgid(cred) (current->fsgid)
155
156	#define NBPP PAGE_SIZE
157	#define DPPSHFT (PAGE_SHIFT - 9)
158	#define NDPP (1 << (PAGE_SHIFT - 9))
159	#define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT)
160	#define dtopt(DD) ((DD) >> DPPSHFT)
161	#define dpoff(DD) ((DD) & (NDPP-1))
162
163	#define NBBY 8 /* number of bits per byte */
164	#define NBPC PAGE_SIZE /* Number of bytes per click */
165	#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
166
167	/*
168	* Size of block device i/o is parameterized here.
169	* Currently the system supports page-sized i/o.
170	*/
171	#define BLKDEV_IOSHIFT BPCSHIFT
172	#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
173	/* number of BB's per block device block */
174	#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
175
176	/* bytes to clicks */
177	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
178	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
179	#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
180	#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
181	#define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
182	#define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT)
183
184	/* off_t bytes to clicks */
185	#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
186	#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
187
188	/* clicks to off_t bytes */
189	#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
190
191	/* clicks to bytes */
192	#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
193	#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
194	#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
195	#define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT)
196
197	/* bytes to clicks */
198	#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
199
200	#ifndef CELL_CAPABLE
201	#define FSC_NOTIFY_NAME_CHANGED(vp)
202	#endif
203
204	#ifndef ENOATTR
205	#define ENOATTR ENODATA /* Attribute not found */
206	#endif
207
208	/* Note: EWRONGFS never visible outside the kernel */
209	#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
210
211	/*
212	* XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
213	* return codes out of its known range in errno.
214	* XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
215	* conflict with any code we use already or any code a driver may use)
216	* XXX Some options (currently we do #2):
217	* 1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
218	* 2/ 990 ["Unknown error 990"]
219	* 3/ EUCLEAN ["Structure needs cleaning"]
220	* 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
221	*/
222	#define EFSCORRUPTED 990 /* Filesystem is corrupted */
223
224	#define SYNCHRONIZE() barrier()
225	#define __return_address __builtin_return_address(0)
226
227	/*
228	* IRIX (BSD) quotactl makes use of separate commands for user/group,
229	* whereas on Linux the syscall encodes this information into the cmd
230	* field (see the QCMD macro in quota.h). These macros help keep the
231	* code portable - they are not visible from the syscall interface.
232	*/
233	#define Q_XSETGQLIM XQM_CMD(0x8) /* set groups disk limits */
234	#define Q_XGETGQUOTA XQM_CMD(0x9) /* get groups disk limits */
235
236	/* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs2) /
237	/* we may well need to fine-tune this if it ever becomes an issue. */
238	#define DQUOT_MAX_HEURISTIC 1024 /* NR_DQUOTS */
239	#define ndquot DQUOT_MAX_HEURISTIC
240
241	/* IRIX uses the current size of the name cache to guess a good value */
242	/* - this isn't the same but is a good enough starting point for now. */
243	#define DQUOT_HASH_HEURISTIC files_stat.nr_files
244
245	/* IRIX inodes maintain the project ID also, zero this field on Linux */
246	#define DEFAULT_PROJID 0
247	#define dfltprid DEFAULT_PROJID
248
249	#define MAXPATHLEN 1024
250
251	#define MIN(a,b) (min(a,b))
252	#define MAX(a,b) (max(a,b))
253	#define howmany(x, y) (((x)+((y)-1))/(y))
254	#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
255
256	#define xfs_stack_trace() dump_stack()
257
258	#define xfs_itruncate_data(ip, off) \
259	(-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
260
261
262	/* Move the kernel do_div definition off to one side */
263
264	#if defined __i386__
265	/* For ia32 we need to pull some tricks to get past various versions
266	* of the compiler which do not like us using do_div in the middle
267	* of large functions.
268	*/
269	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
270	{
271	__u32 mod;
272
273	switch (n) {
274	case 4:
275	mod = (__u32 )a % b;
276	(__u32 )a = (__u32 )a / b;
277	return mod;
278	case 8:
279	{
280	unsigned long __upper, __low, __high, __mod;
281	__u64 c = (__u64 )a;
282	__upper = __high = c >> 32;
283	__low = c;
284	if (__high) {
285	__upper = __high % (b);
286	__high = __high / (b);
287	}
288	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
289	asm("":"=A" (c):"a" (__low),"d" (__high));
290	(__u64 )a = c;
291	return __mod;
292	}
293	}
294
295	/* NOTREACHED */
296	return 0;
297	}
298
299	/* Side effect free 64 bit mod operation */
300	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
301	{
302	switch (n) {
303	case 4:
304	return (__u32 )a % b;
305	case 8:
306	{
307	unsigned long __upper, __low, __high, __mod;
308	__u64 c = (__u64 )a;
309	__upper = __high = c >> 32;
310	__low = c;
311	if (__high) {
312	__upper = __high % (b);
313	__high = __high / (b);
314	}
315	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
316	asm("":"=A" (c):"a" (__low),"d" (__high));
317	return __mod;
318	}
319	}
320
321	/* NOTREACHED */
322	return 0;
323	}
324	#else
325	static inline __u32 xfs_do_div(void *a, __u32 b, int n)
326	{
327	__u32 mod;
328
329	switch (n) {
330	case 4:
331	mod = (__u32 )a % b;
332	(__u32 )a = (__u32 )a / b;
333	return mod;
334	case 8:
335	mod = do_div((__u64 )a, b);
336	return mod;
337	}
338
339	/* NOTREACHED */
340	return 0;
341	}
342
343	/* Side effect free 64 bit mod operation */
344	static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
345	{
346	switch (n) {
347	case 4:
348	return (__u32 )a % b;
349	case 8:
350	{
351	__u64 c = (__u64 )a;
352	return do_div(c, b);
353	}
354	}
355
356	/* NOTREACHED */
357	return 0;
358	}
359	#endif
360
361	#undef do_div
362	#define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
363	#define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
364
365	static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
366	{
367	x += y - 1;
368	do_div(x, y);
369	return(x * y);
370	}
371
372	#define qsort(a, n, s, cmp) sort(a, n, s, cmp, NULL)
373
374	#endif /* __XFS_LINUX__ */