linux/fs/xfs/xfs_linux.h
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   1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef __XFS_LINUX__
  19#define __XFS_LINUX__
  20
  21#include <linux/types.h>
  22
  23/*
  24 * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
  25 * XFS_BIG_INUMS requires XFS_BIG_BLKNOS to be set.
  26 */
  27#if defined(CONFIG_LBDAF) || (BITS_PER_LONG == 64)
  28# define XFS_BIG_BLKNOS 1
  29# define XFS_BIG_INUMS  1
  30#else
  31# define XFS_BIG_BLKNOS 0
  32# define XFS_BIG_INUMS  0
  33#endif
  34
  35#include "xfs_types.h"
  36
  37#include "kmem.h"
  38#include "mrlock.h"
  39#include "time.h"
  40#include "uuid.h"
  41
  42#include <linux/semaphore.h>
  43#include <linux/mm.h>
  44#include <linux/kernel.h>
  45#include <linux/blkdev.h>
  46#include <linux/slab.h>
  47#include <linux/crc32c.h>
  48#include <linux/module.h>
  49#include <linux/mutex.h>
  50#include <linux/file.h>
  51#include <linux/swap.h>
  52#include <linux/errno.h>
  53#include <linux/sched.h>
  54#include <linux/bitops.h>
  55#include <linux/major.h>
  56#include <linux/pagemap.h>
  57#include <linux/vfs.h>
  58#include <linux/seq_file.h>
  59#include <linux/init.h>
  60#include <linux/list.h>
  61#include <linux/proc_fs.h>
  62#include <linux/sort.h>
  63#include <linux/cpu.h>
  64#include <linux/notifier.h>
  65#include <linux/delay.h>
  66#include <linux/log2.h>
  67#include <linux/spinlock.h>
  68#include <linux/random.h>
  69#include <linux/ctype.h>
  70#include <linux/writeback.h>
  71#include <linux/capability.h>
  72#include <linux/kthread.h>
  73#include <linux/freezer.h>
  74#include <linux/list_sort.h>
  75#include <linux/ratelimit.h>
  76
  77#include <asm/page.h>
  78#include <asm/div64.h>
  79#include <asm/param.h>
  80#include <asm/uaccess.h>
  81#include <asm/byteorder.h>
  82#include <asm/unaligned.h>
  83
  84#include "xfs_vnode.h"
  85#include "xfs_stats.h"
  86#include "xfs_sysctl.h"
  87#include "xfs_iops.h"
  88#include "xfs_aops.h"
  89#include "xfs_super.h"
  90#include "xfs_buf.h"
  91#include "xfs_message.h"
  92
  93#ifdef __BIG_ENDIAN
  94#define XFS_NATIVE_HOST 1
  95#else
  96#undef XFS_NATIVE_HOST
  97#endif
  98
  99/*
 100 * Feature macros (disable/enable)
 101 */
 102#ifdef CONFIG_SMP
 103#define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 104#else
 105#undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 106#endif
 107
 108#define irix_sgid_inherit       xfs_params.sgid_inherit.val
 109#define irix_symlink_mode       xfs_params.symlink_mode.val
 110#define xfs_panic_mask          xfs_params.panic_mask.val
 111#define xfs_error_level         xfs_params.error_level.val
 112#define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 113#define xfs_stats_clear         xfs_params.stats_clear.val
 114#define xfs_inherit_sync        xfs_params.inherit_sync.val
 115#define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 116#define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 117#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 118#define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 119#define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 120#define xfs_rotorstep           xfs_params.rotorstep.val
 121#define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 122#define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 123#define xfs_eofb_secs           xfs_params.eofb_timer.val
 124
 125#define current_cpu()           (raw_smp_processor_id())
 126#define current_pid()           (current->pid)
 127#define current_test_flags(f)   (current->flags & (f))
 128#define current_set_flags_nested(sp, f)         \
 129                (*(sp) = current->flags, current->flags |= (f))
 130#define current_clear_flags_nested(sp, f)       \
 131                (*(sp) = current->flags, current->flags &= ~(f))
 132#define current_restore_flags_nested(sp, f)     \
 133                (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 134
 135#define spinlock_destroy(lock)
 136
 137#define NBBY            8               /* number of bits per byte */
 138
 139/*
 140 * Size of block device i/o is parameterized here.
 141 * Currently the system supports page-sized i/o.
 142 */
 143#define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 144#define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 145/* number of BB's per block device block */
 146#define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 147
 148#define ENOATTR         ENODATA         /* Attribute not found */
 149#define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 150#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 151
 152#define SYNCHRONIZE()   barrier()
 153#define __return_address __builtin_return_address(0)
 154
 155#define XFS_PROJID_DEFAULT      0
 156#define MAXPATHLEN      1024
 157
 158#define MIN(a,b)        (min(a,b))
 159#define MAX(a,b)        (max(a,b))
 160#define howmany(x, y)   (((x)+((y)-1))/(y))
 161
 162/*
 163 * Various platform dependent calls that don't fit anywhere else
 164 */
 165#define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 166#define xfs_stack_trace()       dump_stack()
 167
 168
 169/* Move the kernel do_div definition off to one side */
 170
 171#if defined __i386__
 172/* For ia32 we need to pull some tricks to get past various versions
 173 * of the compiler which do not like us using do_div in the middle
 174 * of large functions.
 175 */
 176static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 177{
 178        __u32   mod;
 179
 180        switch (n) {
 181                case 4:
 182                        mod = *(__u32 *)a % b;
 183                        *(__u32 *)a = *(__u32 *)a / b;
 184                        return mod;
 185                case 8:
 186                        {
 187                        unsigned long __upper, __low, __high, __mod;
 188                        __u64   c = *(__u64 *)a;
 189                        __upper = __high = c >> 32;
 190                        __low = c;
 191                        if (__high) {
 192                                __upper = __high % (b);
 193                                __high = __high / (b);
 194                        }
 195                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 196                        asm("":"=A" (c):"a" (__low),"d" (__high));
 197                        *(__u64 *)a = c;
 198                        return __mod;
 199                        }
 200        }
 201
 202        /* NOTREACHED */
 203        return 0;
 204}
 205
 206/* Side effect free 64 bit mod operation */
 207static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 208{
 209        switch (n) {
 210                case 4:
 211                        return *(__u32 *)a % b;
 212                case 8:
 213                        {
 214                        unsigned long __upper, __low, __high, __mod;
 215                        __u64   c = *(__u64 *)a;
 216                        __upper = __high = c >> 32;
 217                        __low = c;
 218                        if (__high) {
 219                                __upper = __high % (b);
 220                                __high = __high / (b);
 221                        }
 222                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 223                        asm("":"=A" (c):"a" (__low),"d" (__high));
 224                        return __mod;
 225                        }
 226        }
 227
 228        /* NOTREACHED */
 229        return 0;
 230}
 231#else
 232static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 233{
 234        __u32   mod;
 235
 236        switch (n) {
 237                case 4:
 238                        mod = *(__u32 *)a % b;
 239                        *(__u32 *)a = *(__u32 *)a / b;
 240                        return mod;
 241                case 8:
 242                        mod = do_div(*(__u64 *)a, b);
 243                        return mod;
 244        }
 245
 246        /* NOTREACHED */
 247        return 0;
 248}
 249
 250/* Side effect free 64 bit mod operation */
 251static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 252{
 253        switch (n) {
 254                case 4:
 255                        return *(__u32 *)a % b;
 256                case 8:
 257                        {
 258                        __u64   c = *(__u64 *)a;
 259                        return do_div(c, b);
 260                        }
 261        }
 262
 263        /* NOTREACHED */
 264        return 0;
 265}
 266#endif
 267
 268#undef do_div
 269#define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 270#define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 271
 272static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 273{
 274        x += y - 1;
 275        do_div(x, y);
 276        return(x * y);
 277}
 278
 279static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 280{
 281        x += y - 1;
 282        do_div(x, y);
 283        return x;
 284}
 285
 286/* ARM old ABI has some weird alignment/padding */
 287#if defined(__arm__) && !defined(__ARM_EABI__)
 288#define __arch_pack __attribute__((packed))
 289#else
 290#define __arch_pack
 291#endif
 292
 293#define ASSERT_ALWAYS(expr)     \
 294        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 295
 296#ifdef DEBUG
 297#define ASSERT(expr)    \
 298        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 299
 300#ifndef STATIC
 301# define STATIC noinline
 302#endif
 303
 304#else   /* !DEBUG */
 305
 306#ifdef XFS_WARN
 307
 308#define ASSERT(expr)    \
 309        (unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
 310
 311#ifndef STATIC
 312# define STATIC static noinline
 313#endif
 314
 315#else   /* !DEBUG && !XFS_WARN */
 316
 317#define ASSERT(expr)    ((void)0)
 318
 319#ifndef STATIC
 320# define STATIC static noinline
 321#endif
 322
 323#endif /* XFS_WARN */
 324#endif /* DEBUG */
 325
 326#endif /* __XFS_LINUX__ */
 327
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