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