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linux-pinenote/fs/xfs/xfs_linux.h
Christoph Hellwig bc02e8693d xfs: add CRC infrastructure 
- add a mount feature bit for CRC enabled filesystems
 - add some helpers for generating and verifying the CRCs
 - add a copy_uuid helper

The checksumming helpers are loosely based on similar ones in sctp,
all other bits come from Dave Chinner.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2012-11-19 20:11:24 -06:00

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/*
* 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>
/*
* XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
* XFS_BIG_INUMS requires XFS_BIG_BLKNOS to be set.
*/
#if defined(CONFIG_LBDAF) || (BITS_PER_LONG == 64)
# define XFS_BIG_BLKNOS 1
# define XFS_BIG_INUMS 1
#else
# define XFS_BIG_BLKNOS 0
# define XFS_BIG_INUMS 0
#endif
#include "xfs_types.h"
#include "kmem.h"
#include "mrlock.h"
#include "time.h"
#include "uuid.h"
#include <linux/semaphore.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/crc32c.h>
#include <linux/module.h>
#include <linux/mutex.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 <linux/log2.h>
#include <linux/spinlock.h>
#include <linux/random.h>
#include <linux/ctype.h>
#include <linux/writeback.h>
#include <linux/capability.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/list_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_vnode.h"
#include "xfs_stats.h"
#include "xfs_sysctl.h"
#include "xfs_iops.h"
#include "xfs_aops.h"
#include "xfs_super.h"
#include "xfs_buf.h"
#include "xfs_message.h"
#ifdef __BIG_ENDIAN
#define XFS_NATIVE_HOST 1
#else
#undef XFS_NATIVE_HOST
#endif
/*
* Feature macros (disable/enable)
*/
#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 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 xfs_eofb_secs xfs_params.eofb_timer.val
#define current_cpu() (raw_smp_processor_id())
#define current_pid() (current->pid)
#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 spinlock_destroy(lock)
#define NBBY 8 /* number of bits per byte */
/*
* Size of block device i/o is parameterized here.
* Currently the system supports page-sized i/o.
*/
#define BLKDEV_IOSHIFT PAGE_CACHE_SHIFT
#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
/* number of BB's per block device block */
#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
#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)
#define XFS_PROJID_DEFAULT 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()
/* 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;
}
/* ARM old ABI has some weird alignment/padding */
#if defined(__arm__) && !defined(__ARM_EABI__)
#define __arch_pack __attribute__((packed))
#else
#define __arch_pack
#endif
#define ASSERT_ALWAYS(expr) \
(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
#ifndef DEBUG
#define ASSERT(expr) ((void)0)
#ifndef STATIC
# define STATIC static noinline
#endif
#else /* DEBUG */
#define ASSERT(expr) \
(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
#ifndef STATIC
# define STATIC noinline
#endif
#endif /* DEBUG */
#endif /* __XFS_LINUX__ */
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