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 /*
  36  * Kernel specific type declarations for XFS
  37  */
  38 typedef signed char             __int8_t;
  39 typedef unsigned char           __uint8_t;
  40 typedef signed short int        __int16_t;
  41 typedef unsigned short int      __uint16_t;
  42 typedef signed int              __int32_t;
  43 typedef unsigned int            __uint32_t;
  44 typedef signed long long int    __int64_t;
  45 typedef unsigned long long int  __uint64_t;
  46
  47 typedef __uint32_t              inst_t;         /* an instruction */
  48
  49 typedef __s64                   xfs_off_t;      /* <file offset> type */
  50 typedef unsigned long long      xfs_ino_t;      /* <inode> type */
  51 typedef __s64                   xfs_daddr_t;    /* <disk address> type */
  52 typedef char *                  xfs_caddr_t;    /* <core address> type */
  53 typedef __u32                   xfs_dev_t;
  54 typedef __u32                   xfs_nlink_t;
  55
  56 /* __psint_t is the same size as a pointer */
  57 #if (BITS_PER_LONG == 32)
  58 typedef __int32_t __psint_t;
  59 typedef __uint32_t __psunsigned_t;
  60 #elif (BITS_PER_LONG == 64)
  61 typedef __int64_t __psint_t;
  62 typedef __uint64_t __psunsigned_t;
  63 #else
  64 #error BITS_PER_LONG must be 32 or 64
  65 #endif
  66
  67 #include "xfs_types.h"
  68
  69 #include "kmem.h"
  70 #include "mrlock.h"
  71 #include "time.h"
  72 #include "uuid.h"
  73
  74 #include <linux/semaphore.h>
  75 #include <linux/mm.h>
  76 #include <linux/kernel.h>
  77 #include <linux/blkdev.h>
  78 #include <linux/slab.h>
  79 #include <linux/crc32c.h>
  80 #include <linux/module.h>
  81 #include <linux/mutex.h>
  82 #include <linux/file.h>
  83 #include <linux/swap.h>
  84 #include <linux/errno.h>
  85 #include <linux/sched.h>
  86 #include <linux/bitops.h>
  87 #include <linux/major.h>
  88 #include <linux/pagemap.h>
  89 #include <linux/vfs.h>
  90 #include <linux/seq_file.h>
  91 #include <linux/init.h>
  92 #include <linux/list.h>
  93 #include <linux/proc_fs.h>
  94 #include <linux/sort.h>
  95 #include <linux/cpu.h>
  96 #include <linux/notifier.h>
  97 #include <linux/delay.h>
  98 #include <linux/log2.h>
  99 #include <linux/spinlock.h>
 100 #include <linux/random.h>
 101 #include <linux/ctype.h>
 102 #include <linux/writeback.h>
 103 #include <linux/capability.h>
 104 #include <linux/kthread.h>
 105 #include <linux/freezer.h>
 106 #include <linux/list_sort.h>
 107 #include <linux/ratelimit.h>
 108
 109 #include <asm/page.h>
 110 #include <asm/div64.h>
 111 #include <asm/param.h>
 112 #include <asm/uaccess.h>
 113 #include <asm/byteorder.h>
 114 #include <asm/unaligned.h>
 115
 116 #include "xfs_vnode.h"
 117 #include "xfs_stats.h"
 118 #include "xfs_sysctl.h"
 119 #include "xfs_iops.h"
 120 #include "xfs_aops.h"
 121 #include "xfs_super.h"
 122 #include "xfs_buf.h"
 123 #include "xfs_message.h"
 124
 125 #ifdef __BIG_ENDIAN
 126 #define XFS_NATIVE_HOST 1
 127 #else
 128 #undef XFS_NATIVE_HOST
 129 #endif
 130
 131 /*
 132  * Feature macros (disable/enable)
 133  */
 134 #ifdef CONFIG_SMP
 135 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 136 #else
 137 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 138 #endif
 139
 140 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 141 #define irix_symlink_mode       xfs_params.symlink_mode.val
 142 #define xfs_panic_mask          xfs_params.panic_mask.val
 143 #define xfs_error_level         xfs_params.error_level.val
 144 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 145 #define xfs_stats_clear         xfs_params.stats_clear.val
 146 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 147 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 148 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 149 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 150 #define xfs_rotorstep           xfs_params.rotorstep.val
 151 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 152 #define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 153 #define xfs_eofb_secs           xfs_params.eofb_timer.val
 154
 155 #define current_cpu()           (raw_smp_processor_id())
 156 #define current_pid()           (current->pid)
 157 #define current_test_flags(f)   (current->flags & (f))
 158 #define current_set_flags_nested(sp, f)         \
 159                 (*(sp) = current->flags, current->flags |= (f))
 160 #define current_clear_flags_nested(sp, f)       \
 161                 (*(sp) = current->flags, current->flags &= ~(f))
 162 #define current_restore_flags_nested(sp, f)     \
 163                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 164
 165 #define spinlock_destroy(lock)
 166
 167 #define NBBY            8               /* number of bits per byte */
 168
 169 /*
 170  * Size of block device i/o is parameterized here.
 171  * Currently the system supports page-sized i/o.
 172  */
 173 #define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 174 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 175 /* number of BB's per block device block */
 176 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 177
 178 #define ENOATTR         ENODATA         /* Attribute not found */
 179 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 180 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 181
 182 #define SYNCHRONIZE()   barrier()
 183 #define __return_address __builtin_return_address(0)
 184
 185 #define XFS_PROJID_DEFAULT      0
 186 #define MAXPATHLEN      1024
 187
 188 #define MIN(a,b)        (min(a,b))
 189 #define MAX(a,b)        (max(a,b))
 190 #define howmany(x, y)   (((x)+((y)-1))/(y))
 191
 192 /* Kernel uid/gid conversion. These are used to convert to/from the on disk
 193  * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
 194  * The conversion here is type only, the value will remain the same since we
 195  * are converting to the init_user_ns. The uid is later mapped to a particular
 196  * user namespace value when crossing the kernel/user boundary.
 197  */
 198 static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
 199 {
 200         return from_kuid(&init_user_ns, uid);
 201 }
 202
 203 static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
 204 {
 205         return make_kuid(&init_user_ns, uid);
 206 }
 207
 208 static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
 209 {
 210         return from_kgid(&init_user_ns, gid);
 211 }
 212
 213 static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
 214 {
 215         return make_kgid(&init_user_ns, gid);
 216 }
 217
 218 /*
 219  * Various platform dependent calls that don't fit anywhere else
 220  */
 221 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 222 #define xfs_stack_trace()       dump_stack()
 223
 224
 225 /* Move the kernel do_div definition off to one side */
 226
 227 #if defined __i386__
 228 /* For ia32 we need to pull some tricks to get past various versions
 229  * of the compiler which do not like us using do_div in the middle
 230  * of large functions.
 231  */
 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                         {
 243                         unsigned long __upper, __low, __high, __mod;
 244                         __u64   c = *(__u64 *)a;
 245                         __upper = __high = c >> 32;
 246                         __low = c;
 247                         if (__high) {
 248                                 __upper = __high % (b);
 249                                 __high = __high / (b);
 250                         }
 251                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 252                         asm("":"=A" (c):"a" (__low),"d" (__high));
 253                         *(__u64 *)a = c;
 254                         return __mod;
 255                         }
 256         }
 257
 258         /* NOTREACHED */
 259         return 0;
 260 }
 261
 262 /* Side effect free 64 bit mod operation */
 263 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 264 {
 265         switch (n) {
 266                 case 4:
 267                         return *(__u32 *)a % b;
 268                 case 8:
 269                         {
 270                         unsigned long __upper, __low, __high, __mod;
 271                         __u64   c = *(__u64 *)a;
 272                         __upper = __high = c >> 32;
 273                         __low = c;
 274                         if (__high) {
 275                                 __upper = __high % (b);
 276                                 __high = __high / (b);
 277                         }
 278                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 279                         asm("":"=A" (c):"a" (__low),"d" (__high));
 280                         return __mod;
 281                         }
 282         }
 283
 284         /* NOTREACHED */
 285         return 0;
 286 }
 287 #else
 288 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 289 {
 290         __u32   mod;
 291
 292         switch (n) {
 293                 case 4:
 294                         mod = *(__u32 *)a % b;
 295                         *(__u32 *)a = *(__u32 *)a / b;
 296                         return mod;
 297                 case 8:
 298                         mod = do_div(*(__u64 *)a, b);
 299                         return mod;
 300         }
 301
 302         /* NOTREACHED */
 303         return 0;
 304 }
 305
 306 /* Side effect free 64 bit mod operation */
 307 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 308 {
 309         switch (n) {
 310                 case 4:
 311                         return *(__u32 *)a % b;
 312                 case 8:
 313                         {
 314                         __u64   c = *(__u64 *)a;
 315                         return do_div(c, b);
 316                         }
 317         }
 318
 319         /* NOTREACHED */
 320         return 0;
 321 }
 322 #endif
 323
 324 #undef do_div
 325 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 326 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 327
 328 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 329 {
 330         x += y - 1;
 331         do_div(x, y);
 332         return(x * y);
 333 }
 334
 335 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 336 {
 337         x += y - 1;
 338         do_div(x, y);
 339         return x;
 340 }
 341
 342 /* ARM old ABI has some weird alignment/padding */
 343 #if defined(__arm__) && !defined(__ARM_EABI__)
 344 #define __arch_pack __attribute__((packed))
 345 #else
 346 #define __arch_pack
 347 #endif
 348
 349 #define ASSERT_ALWAYS(expr)     \
 350         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 351
 352 #ifdef DEBUG
 353 #define ASSERT(expr)    \
 354         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 355
 356 #ifndef STATIC
 357 # define STATIC noinline
 358 #endif
 359
 360 #else   /* !DEBUG */
 361
 362 #ifdef XFS_WARN
 363
 364 #define ASSERT(expr)    \
 365         (unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
 366
 367 #ifndef STATIC
 368 # define STATIC static noinline
 369 #endif
 370
 371 #else   /* !DEBUG && !XFS_WARN */
 372
 373 #define ASSERT(expr)    ((void)0)
 374
 375 #ifndef STATIC
 376 # define STATIC static noinline
 377 #endif
 378
 379 #endif /* XFS_WARN */
 380 #endif /* DEBUG */
 381
 382 #endif /* __XFS_LINUX__ */