LXR linux/fs/xfs/xfs

   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/kthread.h>
  72#include <linux/freezer.h>
  73#include <linux/list_sort.h>
  74
  75#include <asm/page.h>
  76#include <asm/div64.h>
  77#include <asm/param.h>
  78#include <asm/uaccess.h>
  79#include <asm/byteorder.h>
  80#include <asm/unaligned.h>
  81
  82#include "xfs_vnode.h"
  83#include "xfs_stats.h"
  84#include "xfs_sysctl.h"
  85#include "xfs_iops.h"
  86#include "xfs_aops.h"
  87#include "xfs_super.h"
  88#include "xfs_buf.h"
  89#include "xfs_message.h"
  90
  91#ifdef __BIG_ENDIAN
  92#define XFS_NATIVE_HOST 1
  93#else
  94#undef XFS_NATIVE_HOST
  95#endif
  96
  97/*
  98 * Feature macros (disable/enable)
  99 */
 100#ifdef CONFIG_SMP
 101#define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 102#else
 103#undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 104#endif
 105
 106#define irix_sgid_inherit       xfs_params.sgid_inherit.val
 107#define irix_symlink_mode       xfs_params.symlink_mode.val
 108#define xfs_panic_mask          xfs_params.panic_mask.val
 109#define xfs_error_level         xfs_params.error_level.val
 110#define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 111#define xfs_stats_clear         xfs_params.stats_clear.val
 112#define xfs_inherit_sync        xfs_params.inherit_sync.val
 113#define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 114#define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 115#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 116#define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 117#define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 118#define xfs_rotorstep           xfs_params.rotorstep.val
 119#define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 120#define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 121
 122#define current_cpu()           (raw_smp_processor_id())
 123#define current_pid()           (current->pid)
 124#define current_test_flags(f)   (current->flags & (f))
 125#define current_set_flags_nested(sp, f)         \
 126                (*(sp) = current->flags, current->flags |= (f))
 127#define current_clear_flags_nested(sp, f)       \
 128                (*(sp) = current->flags, current->flags &= ~(f))
 129#define current_restore_flags_nested(sp, f)     \
 130                (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 131
 132#define spinlock_destroy(lock)
 133
 134#define NBBY            8               /* number of bits per byte */
 135
 136/*
 137 * Size of block device i/o is parameterized here.
 138 * Currently the system supports page-sized i/o.
 139 */
 140#define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 141#define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 142/* number of BB's per block device block */
 143#define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 144
 145#define ENOATTR         ENODATA         /* Attribute not found */
 146#define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 147#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 148
 149#define SYNCHRONIZE()   barrier()
 150#define __return_address __builtin_return_address(0)
 151
 152#define XFS_PROJID_DEFAULT      0
 153#define MAXPATHLEN      1024
 154
 155#define MIN(a,b)        (min(a,b))
 156#define MAX(a,b)        (max(a,b))
 157#define howmany(x, y)   (((x)+((y)-1))/(y))
 158
 159/*
 160 * Various platform dependent calls that don't fit anywhere else
 161 */
 162#define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 163#define xfs_stack_trace()       dump_stack()
 164
 165
 166/* Move the kernel do_div definition off to one side */
 167
 168#if defined __i386__
 169/* For ia32 we need to pull some tricks to get past various versions
 170 * of the compiler which do not like us using do_div in the middle
 171 * of large functions.
 172 */
 173static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 174{
 175        __u32   mod;
 176
 177        switch (n) {
 178                case 4:
 179                        mod = *(__u32 *)a % b;
 180                        *(__u32 *)a = *(__u32 *)a / b;
 181                        return mod;
 182                case 8:
 183                        {
 184                        unsigned long __upper, __low, __high, __mod;
 185                        __u64   c = *(__u64 *)a;
 186                        __upper = __high = c >> 32;
 187                        __low = c;
 188                        if (__high) {
 189                                __upper = __high % (b);
 190                                __high = __high / (b);
 191                        }
 192                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 193                        asm("":"=A" (c):"a" (__low),"d" (__high));
 194                        *(__u64 *)a = c;
 195                        return __mod;
 196                        }
 197        }
 198
 199        /* NOTREACHED */
 200        return 0;
 201}
 202
 203/* Side effect free 64 bit mod operation */
 204static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 205{
 206        switch (n) {
 207                case 4:
 208                        return *(__u32 *)a % b;
 209                case 8:
 210                        {
 211                        unsigned long __upper, __low, __high, __mod;
 212                        __u64   c = *(__u64 *)a;
 213                        __upper = __high = c >> 32;
 214                        __low = c;
 215                        if (__high) {
 216                                __upper = __high % (b);
 217                                __high = __high / (b);
 218                        }
 219                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 220                        asm("":"=A" (c):"a" (__low),"d" (__high));
 221                        return __mod;
 222                        }
 223        }
 224
 225        /* NOTREACHED */
 226        return 0;
 227}
 228#else
 229static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 230{
 231        __u32   mod;
 232
 233        switch (n) {
 234                case 4:
 235                        mod = *(__u32 *)a % b;
 236                        *(__u32 *)a = *(__u32 *)a / b;
 237                        return mod;
 238                case 8:
 239                        mod = do_div(*(__u64 *)a, b);
 240                        return mod;
 241        }
 242
 243        /* NOTREACHED */
 244        return 0;
 245}
 246
 247/* Side effect free 64 bit mod operation */
 248static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 249{
 250        switch (n) {
 251                case 4:
 252                        return *(__u32 *)a % b;
 253                case 8:
 254                        {
 255                        __u64   c = *(__u64 *)a;
 256                        return do_div(c, b);
 257                        }
 258        }
 259
 260        /* NOTREACHED */
 261        return 0;
 262}
 263#endif
 264
 265#undef do_div
 266#define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 267#define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 268
 269static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 270{
 271        x += y - 1;
 272        do_div(x, y);
 273        return(x * y);
 274}
 275
 276static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 277{
 278        x += y - 1;
 279        do_div(x, y);
 280        return x;
 281}
 282
 283/* ARM old ABI has some weird alignment/padding */
 284#if defined(__arm__) && !defined(__ARM_EABI__)
 285#define __arch_pack __attribute__((packed))
 286#else
 287#define __arch_pack
 288#endif
 289
 290#define ASSERT_ALWAYS(expr)     \
 291        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 292
 293#ifndef DEBUG
 294#define ASSERT(expr)    ((void)0)
 295
 296#ifndef STATIC
 297# define STATIC static noinline
 298#endif
 299
 300#else /* DEBUG */
 301
 302#define ASSERT(expr)    \
 303        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 304
 305#ifndef STATIC
 306# define STATIC noinline
 307#endif
 308
 309#endif /* DEBUG */
 310
 311#endif /* __XFS_LINUX__ */
 312