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  * Kernel specific type declarations for XFS
  25  */
  26 typedef signed char             __int8_t;
  27 typedef unsigned char           __uint8_t;
  28 typedef signed short int        __int16_t;
  29 typedef unsigned short int      __uint16_t;
  30 typedef signed int              __int32_t;
  31 typedef unsigned int            __uint32_t;
  32 typedef signed long long int    __int64_t;
  33 typedef unsigned long long int  __uint64_t;
  34
  35 typedef __uint32_t              inst_t;         /* an instruction */
  36
  37 typedef __s64                   xfs_off_t;      /* <file offset> type */
  38 typedef unsigned long long      xfs_ino_t;      /* <inode> type */
  39 typedef __s64                   xfs_daddr_t;    /* <disk address> type */
  40 typedef char *                  xfs_caddr_t;    /* <core address> type */
  41 typedef __u32                   xfs_dev_t;
  42 typedef __u32                   xfs_nlink_t;
  43
  44 /* __psint_t is the same size as a pointer */
  45 #if (BITS_PER_LONG == 32)
  46 typedef __int32_t __psint_t;
  47 typedef __uint32_t __psunsigned_t;
  48 #elif (BITS_PER_LONG == 64)
  49 typedef __int64_t __psint_t;
  50 typedef __uint64_t __psunsigned_t;
  51 #else
  52 #error BITS_PER_LONG must be 32 or 64
  53 #endif
  54
  55 #include "xfs_types.h"
  56
  57 #include "kmem.h"
  58 #include "mrlock.h"
  59 #include "uuid.h"
  60
  61 #include <linux/semaphore.h>
  62 #include <linux/mm.h>
  63 #include <linux/kernel.h>
  64 #include <linux/blkdev.h>
  65 #include <linux/slab.h>
  66 #include <linux/crc32c.h>
  67 #include <linux/module.h>
  68 #include <linux/mutex.h>
  69 #include <linux/file.h>
  70 #include <linux/swap.h>
  71 #include <linux/errno.h>
  72 #include <linux/sched.h>
  73 #include <linux/bitops.h>
  74 #include <linux/major.h>
  75 #include <linux/pagemap.h>
  76 #include <linux/vfs.h>
  77 #include <linux/seq_file.h>
  78 #include <linux/init.h>
  79 #include <linux/list.h>
  80 #include <linux/proc_fs.h>
  81 #include <linux/sort.h>
  82 #include <linux/cpu.h>
  83 #include <linux/notifier.h>
  84 #include <linux/delay.h>
  85 #include <linux/log2.h>
  86 #include <linux/spinlock.h>
  87 #include <linux/random.h>
  88 #include <linux/ctype.h>
  89 #include <linux/writeback.h>
  90 #include <linux/capability.h>
  91 #include <linux/kthread.h>
  92 #include <linux/freezer.h>
  93 #include <linux/list_sort.h>
  94 #include <linux/ratelimit.h>
  95
  96 #include <asm/page.h>
  97 #include <asm/div64.h>
  98 #include <asm/param.h>
  99 #include <asm/uaccess.h>
 100 #include <asm/byteorder.h>
 101 #include <asm/unaligned.h>
 102
 103 #include "xfs_fs.h"
 104 #include "xfs_stats.h"
 105 #include "xfs_sysctl.h"
 106 #include "xfs_iops.h"
 107 #include "xfs_aops.h"
 108 #include "xfs_super.h"
 109 #include "xfs_cksum.h"
 110 #include "xfs_buf.h"
 111 #include "xfs_message.h"
 112
 113 #ifdef __BIG_ENDIAN
 114 #define XFS_NATIVE_HOST 1
 115 #else
 116 #undef XFS_NATIVE_HOST
 117 #endif
 118
 119 /*
 120  * Feature macros (disable/enable)
 121  */
 122 #ifdef CONFIG_SMP
 123 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 124 #else
 125 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 126 #endif
 127
 128 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 129 #define irix_symlink_mode       xfs_params.symlink_mode.val
 130 #define xfs_panic_mask          xfs_params.panic_mask.val
 131 #define xfs_error_level         xfs_params.error_level.val
 132 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 133 #define xfs_stats_clear         xfs_params.stats_clear.val
 134 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 135 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 136 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 137 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 138 #define xfs_rotorstep           xfs_params.rotorstep.val
 139 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 140 #define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 141 #define xfs_eofb_secs           xfs_params.eofb_timer.val
 142
 143 #define current_cpu()           (raw_smp_processor_id())
 144 #define current_pid()           (current->pid)
 145 #define current_test_flags(f)   (current->flags & (f))
 146 #define current_set_flags_nested(sp, f)         \
 147                 (*(sp) = current->flags, current->flags |= (f))
 148 #define current_clear_flags_nested(sp, f)       \
 149                 (*(sp) = current->flags, current->flags &= ~(f))
 150 #define current_restore_flags_nested(sp, f)     \
 151                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 152
 153 #define spinlock_destroy(lock)
 154
 155 #define NBBY            8               /* number of bits per byte */
 156
 157 /*
 158  * Size of block device i/o is parameterized here.
 159  * Currently the system supports page-sized i/o.
 160  */
 161 #define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 162 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 163 /* number of BB's per block device block */
 164 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 165
 166 #define ENOATTR         ENODATA         /* Attribute not found */
 167 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 168 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 169 #define EFSBADCRC       EBADMSG         /* Bad CRC detected */
 170
 171 #define SYNCHRONIZE()   barrier()
 172 #define __return_address __builtin_return_address(0)
 173
 174 #define XFS_PROJID_DEFAULT      0
 175 #define MAXPATHLEN      1024
 176
 177 #define MIN(a,b)        (min(a,b))
 178 #define MAX(a,b)        (max(a,b))
 179 #define howmany(x, y)   (((x)+((y)-1))/(y))
 180
 181 static inline void delay(long ticks)
 182 {
 183         schedule_timeout_uninterruptible(ticks);
 184 }
 185
 186 /*
 187  * XFS wrapper structure for sysfs support. It depends on external data
 188  * structures and is embedded in various internal data structures to implement
 189  * the XFS sysfs object heirarchy. Define it here for broad access throughout
 190  * the codebase.
 191  */
 192 struct xfs_kobj {
 193         struct kobject          kobject;
 194         struct completion       complete;
 195 };
 196
 197 /* Kernel uid/gid conversion. These are used to convert to/from the on disk
 198  * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
 199  * The conversion here is type only, the value will remain the same since we
 200  * are converting to the init_user_ns. The uid is later mapped to a particular
 201  * user namespace value when crossing the kernel/user boundary.
 202  */
 203 static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
 204 {
 205         return from_kuid(&init_user_ns, uid);
 206 }
 207
 208 static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
 209 {
 210         return make_kuid(&init_user_ns, uid);
 211 }
 212
 213 static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
 214 {
 215         return from_kgid(&init_user_ns, gid);
 216 }
 217
 218 static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
 219 {
 220         return make_kgid(&init_user_ns, gid);
 221 }
 222
 223 /*
 224  * Various platform dependent calls that don't fit anywhere else
 225  */
 226 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 227 #define xfs_stack_trace()       dump_stack()
 228
 229
 230 /* Move the kernel do_div definition off to one side */
 231
 232 #if defined __i386__
 233 /* For ia32 we need to pull some tricks to get past various versions
 234  * of the compiler which do not like us using do_div in the middle
 235  * of large functions.
 236  */
 237 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 238 {
 239         __u32   mod;
 240
 241         switch (n) {
 242                 case 4:
 243                         mod = *(__u32 *)a % b;
 244                         *(__u32 *)a = *(__u32 *)a / b;
 245                         return mod;
 246                 case 8:
 247                         {
 248                         unsigned long __upper, __low, __high, __mod;
 249                         __u64   c = *(__u64 *)a;
 250                         __upper = __high = c >> 32;
 251                         __low = c;
 252                         if (__high) {
 253                                 __upper = __high % (b);
 254                                 __high = __high / (b);
 255                         }
 256                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 257                         asm("":"=A" (c):"a" (__low),"d" (__high));
 258                         *(__u64 *)a = c;
 259                         return __mod;
 260                         }
 261         }
 262
 263         /* NOTREACHED */
 264         return 0;
 265 }
 266
 267 /* Side effect free 64 bit mod operation */
 268 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 269 {
 270         switch (n) {
 271                 case 4:
 272                         return *(__u32 *)a % b;
 273                 case 8:
 274                         {
 275                         unsigned long __upper, __low, __high, __mod;
 276                         __u64   c = *(__u64 *)a;
 277                         __upper = __high = c >> 32;
 278                         __low = c;
 279                         if (__high) {
 280                                 __upper = __high % (b);
 281                                 __high = __high / (b);
 282                         }
 283                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 284                         asm("":"=A" (c):"a" (__low),"d" (__high));
 285                         return __mod;
 286                         }
 287         }
 288
 289         /* NOTREACHED */
 290         return 0;
 291 }
 292 #else
 293 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 294 {
 295         __u32   mod;
 296
 297         switch (n) {
 298                 case 4:
 299                         mod = *(__u32 *)a % b;
 300                         *(__u32 *)a = *(__u32 *)a / b;
 301                         return mod;
 302                 case 8:
 303                         mod = do_div(*(__u64 *)a, b);
 304                         return mod;
 305         }
 306
 307         /* NOTREACHED */
 308         return 0;
 309 }
 310
 311 /* Side effect free 64 bit mod operation */
 312 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 313 {
 314         switch (n) {
 315                 case 4:
 316                         return *(__u32 *)a % b;
 317                 case 8:
 318                         {
 319                         __u64   c = *(__u64 *)a;
 320                         return do_div(c, b);
 321                         }
 322         }
 323
 324         /* NOTREACHED */
 325         return 0;
 326 }
 327 #endif
 328
 329 #undef do_div
 330 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 331 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 332
 333 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 334 {
 335         x += y - 1;
 336         do_div(x, y);
 337         return x * y;
 338 }
 339
 340 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 341 {
 342         x += y - 1;
 343         do_div(x, y);
 344         return x;
 345 }
 346
 347 /* ARM old ABI has some weird alignment/padding */
 348 #if defined(__arm__) && !defined(__ARM_EABI__)
 349 #define __arch_pack __attribute__((packed))
 350 #else
 351 #define __arch_pack
 352 #endif
 353
 354 #define ASSERT_ALWAYS(expr)     \
 355         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 356
 357 #ifdef DEBUG
 358 #define ASSERT(expr)    \
 359         (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 360
 361 #ifndef STATIC
 362 # define STATIC noinline
 363 #endif
 364
 365 #else   /* !DEBUG */
 366
 367 #ifdef XFS_WARN
 368
 369 #define ASSERT(expr)    \
 370         (unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
 371
 372 #ifndef STATIC
 373 # define STATIC static noinline
 374 #endif
 375
 376 #else   /* !DEBUG && !XFS_WARN */
 377
 378 #define ASSERT(expr)    ((void)0)
 379
 380 #ifndef STATIC
 381 # define STATIC static noinline
 382 #endif
 383
 384 #endif /* XFS_WARN */
 385 #endif /* DEBUG */
 386
 387 #ifdef CONFIG_XFS_RT
 388 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
 389 #else
 390 #define XFS_IS_REALTIME_INODE(ip) (0)
 391 #endif
 392
 393 #endif /* __XFS_LINUX__ */