fs/xfs/xfs_linux.h

   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/module.h>
  48 #include <linux/mutex.h>
  49 #include <linux/file.h>
  50 #include <linux/swap.h>
  51 #include <linux/errno.h>
  52 #include <linux/sched.h>
  53 #include <linux/bitops.h>
  54 #include <linux/major.h>
  55 #include <linux/pagemap.h>
  56 #include <linux/vfs.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/init.h>
  59 #include <linux/list.h>
  60 #include <linux/proc_fs.h>
  61 #include <linux/sort.h>
  62 #include <linux/cpu.h>
  63 #include <linux/notifier.h>
  64 #include <linux/delay.h>
  65 #include <linux/log2.h>
  66 #include <linux/spinlock.h>
  67 #include <linux/random.h>
  68 #include <linux/ctype.h>
  69 #include <linux/writeback.h>
  70 #include <linux/capability.h>
  71 #include <linux/list_sort.h>
  72
  73 #include <asm/page.h>
  74 #include <asm/div64.h>
  75 #include <asm/param.h>
  76 #include <asm/uaccess.h>
  77 #include <asm/byteorder.h>
  78 #include <asm/unaligned.h>
  79
  80 #include "xfs_vnode.h"
  81 #include "xfs_stats.h"
  82 #include "xfs_sysctl.h"
  83 #include "xfs_iops.h"
  84 #include "xfs_aops.h"
  85 #include "xfs_super.h"
  86 #include "xfs_buf.h"
  87 #include "xfs_message.h"
  88
  89 #ifdef __BIG_ENDIAN
  90 #define XFS_NATIVE_HOST 1
  91 #else
  92 #undef XFS_NATIVE_HOST
  93 #endif
  94
  95 /*
  96  * Feature macros (disable/enable)
  97  */
  98 #ifdef CONFIG_SMP
  99 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 100 #else
 101 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 102 #endif
 103
 104 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 105 #define irix_symlink_mode       xfs_params.symlink_mode.val
 106 #define xfs_panic_mask          xfs_params.panic_mask.val
 107 #define xfs_error_level         xfs_params.error_level.val
 108 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 109 #define xfs_stats_clear         xfs_params.stats_clear.val
 110 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 111 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 112 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 113 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 114 #define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 115 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 116 #define xfs_rotorstep           xfs_params.rotorstep.val
 117 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 118 #define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 119
 120 #define current_cpu()           (raw_smp_processor_id())
 121 #define current_pid()           (current->pid)
 122 #define current_test_flags(f)   (current->flags & (f))
 123 #define current_set_flags_nested(sp, f)         \
 124                 (*(sp) = current->flags, current->flags |= (f))
 125 #define current_clear_flags_nested(sp, f)       \
 126                 (*(sp) = current->flags, current->flags &= ~(f))
 127 #define current_restore_flags_nested(sp, f)     \
 128                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 129
 130 #define spinlock_destroy(lock)
 131
 132 #define NBBY            8               /* number of bits per byte */
 133
 134 /*
 135  * Size of block device i/o is parameterized here.
 136  * Currently the system supports page-sized i/o.
 137  */
 138 #define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 139 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 140 /* number of BB's per block device block */
 141 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 142
 143 #define ENOATTR         ENODATA         /* Attribute not found */
 144 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 145 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 146
 147 #define SYNCHRONIZE()   barrier()
 148 #define __return_address __builtin_return_address(0)
 149
 150 #define XFS_PROJID_DEFAULT      0
 151 #define MAXPATHLEN      1024
 152
 153 #define MIN(a,b)        (min(a,b))
 154 #define MAX(a,b)        (max(a,b))
 155 #define howmany(x, y)   (((x)+((y)-1))/(y))
 156
 157 /*
 158  * Various platform dependent calls that don't fit anywhere else
 159  */
 160 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 161 #define xfs_stack_trace()       dump_stack()
 162
 163
 164 /* Move the kernel do_div definition off to one side */
 165
 166 #if defined __i386__
 167 /* For ia32 we need to pull some tricks to get past various versions
 168  * of the compiler which do not like us using do_div in the middle
 169  * of large functions.
 170  */
 171 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 172 {
 173         __u32   mod;
 174
 175         switch (n) {
 176                 case 4:
 177                         mod = *(__u32 *)a % b;
 178                         *(__u32 *)a = *(__u32 *)a / b;
 179                         return mod;
 180                 case 8:
 181                         {
 182                         unsigned long __upper, __low, __high, __mod;
 183                         __u64   c = *(__u64 *)a;
 184                         __upper = __high = c >> 32;
 185                         __low = c;
 186                         if (__high) {
 187                                 __upper = __high % (b);
 188                                 __high = __high / (b);
 189                         }
 190                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 191                         asm("":"=A" (c):"a" (__low),"d" (__high));
 192                         *(__u64 *)a = c;
 193                         return __mod;
 194                         }
 195         }
 196
 197         /* NOTREACHED */
 198         return 0;
 199 }
 200
 201 /* Side effect free 64 bit mod operation */
 202 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 203 {
 204         switch (n) {
 205                 case 4:
 206                         return *(__u32 *)a % b;
 207                 case 8:
 208                         {
 209                         unsigned long __upper, __low, __high, __mod;
 210                         __u64   c = *(__u64 *)a;
 211                         __upper = __high = c >> 32;
 212                         __low = c;
 213                         if (__high) {
 214                                 __upper = __high % (b);
 215                                 __high = __high / (b);
 216                         }
 217                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 218                         asm("":"=A" (c):"a" (__low),"d" (__high));
 219                         return __mod;
 220                         }
 221         }
 222
 223         /* NOTREACHED */
 224         return 0;
 225 }
 226 #else
 227 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 228 {
 229         __u32   mod;
 230
 231         switch (n) {
 232                 case 4:
 233                         mod = *(__u32 *)a % b;
 234                         *(__u32 *)a = *(__u32 *)a / b;
 235                         return mod;
 236                 case 8:
 237                         mod = do_div(*(__u64 *)a, b);
 238                         return mod;
 239         }
 240
 241         /* NOTREACHED */
 242         return 0;
 243 }
 244
 245 /* Side effect free 64 bit mod operation */
 246 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 247 {
 248         switch (n) {
 249                 case 4:
 250                         return *(__u32 *)a % b;
 251                 case 8:
 252                         {
 253                         __u64   c = *(__u64 *)a;
 254                         return do_div(c, b);
 255                         }
 256         }
 257
 258         /* NOTREACHED */
 259         return 0;
 260 }
 261 #endif
 262
 263 #undef do_div
 264 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 265 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 266
 267 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 268 {
 269         x += y - 1;
 270         do_div(x, y);
 271         return(x * y);
 272 }
 273
 274 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 275 {
 276         x += y - 1;
 277         do_div(x, y);
 278         return x;
 279 }
 280
 281 /* ARM old ABI has some weird alignment/padding */
 282 #if defined(__arm__) && !defined(__ARM_EABI__)
 283 #define __arch_pack __attribute__((packed))
 284 #else
 285 #define __arch_pack
 286 #endif
 287
 288 #define ASSERT_ALWAYS(expr)     \
 289         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 290
 291 #ifndef DEBUG
 292 #define ASSERT(expr)    ((void)0)
 293
 294 #ifndef STATIC
 295 # define STATIC static noinline
 296 #endif
 297
 298 #else /* DEBUG */
 299
 300 #define ASSERT(expr)    \
 301         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 302
 303 #ifndef STATIC
 304 # define STATIC noinline
 305 #endif
 306
 307 #endif /* DEBUG */
 308
 309 #endif /* __XFS_LINUX__ */