fs/xfs/linux-2.6/xfs_linux.h - kernel/msm-4.9 - Gitiles

 /*
  * 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_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 */

 /*
  * 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 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 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(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 */

 /* 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__ */
	/*
	* 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_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 */

	/*
	* 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 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 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(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 */

	/* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs2) /
	/* 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__ */