/* * 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/proc_fs.h>#include <linux/version.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 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;}#elsestatic 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__ */