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/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  */
 176 static 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 */
 207 static 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
 232 static 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 */
 251 static 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
 272 static 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
 279 static 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__ */