xfs_linux.h

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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/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 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__ */