fs/xfs/linux-2.6/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  * Some types are conditional depending on the target system.
  25  * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
  26  * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
  27  * as requiring XFS_BIG_BLKNOS to be set.
  28  */
  29 #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
  30 # define XFS_BIG_BLKNOS 1
  31 # if BITS_PER_LONG == 64
  32 #  define XFS_BIG_INUMS 1
  33 # else
  34 #  define XFS_BIG_INUMS 0
  35 # endif
  36 #else
  37 # define XFS_BIG_BLKNOS 0
  38 # define XFS_BIG_INUMS  0
  39 #endif
  40
  41 #include <xfs_types.h>
  42 #include <xfs_arch.h>
  43
  44 #include <kmem.h>
  45 #include <mrlock.h>
  46 #include <sv.h>
  47 #include <mutex.h>
  48 #include <sema.h>
  49 #include <time.h>
  50
  51 #include <support/ktrace.h>
  52 #include <support/debug.h>
  53 #include <support/uuid.h>
  54
  55 #include <linux/mm.h>
  56 #include <linux/kernel.h>
  57 #include <linux/blkdev.h>
  58 #include <linux/slab.h>
  59 #include <linux/module.h>
  60 #include <linux/file.h>
  61 #include <linux/swap.h>
  62 #include <linux/errno.h>
  63 #include <linux/sched.h>
  64 #include <linux/bitops.h>
  65 #include <linux/major.h>
  66 #include <linux/pagemap.h>
  67 #include <linux/vfs.h>
  68 #include <linux/seq_file.h>
  69 #include <linux/init.h>
  70 #include <linux/list.h>
  71 #include <linux/proc_fs.h>
  72 #include <linux/sort.h>
  73 #include <linux/cpu.h>
  74 #include <linux/notifier.h>
  75 #include <linux/delay.h>
  76 #include <linux/log2.h>
  77 #include <linux/spinlock.h>
  78
  79 #include <asm/page.h>
  80 #include <asm/div64.h>
  81 #include <asm/param.h>
  82 #include <asm/uaccess.h>
  83 #include <asm/byteorder.h>
  84 #include <asm/unaligned.h>
  85
  86 #include <xfs_vfs.h>
  87 #include <xfs_cred.h>
  88 #include <xfs_vnode.h>
  89 #include <xfs_stats.h>
  90 #include <xfs_sysctl.h>
  91 #include <xfs_iops.h>
  92 #include <xfs_aops.h>
  93 #include <xfs_super.h>
  94 #include <xfs_globals.h>
  95 #include <xfs_fs_subr.h>
  96 #include <xfs_lrw.h>
  97 #include <xfs_buf.h>
  98
  99 /*
 100  * Feature macros (disable/enable)
 101  */
 102 #undef  HAVE_REFCACHE   /* reference cache not needed for NFS in 2.6 */
 103 #define HAVE_SPLICE     /* a splice(2) exists in 2.6, but not in 2.4 */
 104 #ifdef CONFIG_SMP
 105 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 106 #else
 107 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 108 #endif
 109
 110 #define restricted_chown        xfs_params.restrict_chown.val
 111 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 112 #define irix_symlink_mode       xfs_params.symlink_mode.val
 113 #define xfs_panic_mask          xfs_params.panic_mask.val
 114 #define xfs_error_level         xfs_params.error_level.val
 115 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 116 #define xfs_stats_clear         xfs_params.stats_clear.val
 117 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 118 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 119 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 120 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 121 #define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 122 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 123 #define xfs_rotorstep           xfs_params.rotorstep.val
 124 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 125 #define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 126
 127 #define current_cpu()           (raw_smp_processor_id())
 128 #define current_pid()           (current->pid)
 129 #define current_fsuid(cred)     (current->fsuid)
 130 #define current_fsgid(cred)     (current->fsgid)
 131 #define current_test_flags(f)   (current->flags & (f))
 132 #define current_set_flags_nested(sp, f)         \
 133                 (*(sp) = current->flags, current->flags |= (f))
 134 #define current_clear_flags_nested(sp, f)       \
 135                 (*(sp) = current->flags, current->flags &= ~(f))
 136 #define current_restore_flags_nested(sp, f)     \
 137                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 138
 139 #define spinlock_destroy(lock)
 140
 141 #define NBBY            8               /* number of bits per byte */
 142
 143 /*
 144  * Size of block device i/o is parameterized here.
 145  * Currently the system supports page-sized i/o.
 146  */
 147 #define BLKDEV_IOSHIFT          PAGE_CACHE_SHIFT
 148 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 149 /* number of BB's per block device block */
 150 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 151
 152 #define ENOATTR         ENODATA         /* Attribute not found */
 153 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 154 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 155
 156 #define SYNCHRONIZE()   barrier()
 157 #define __return_address __builtin_return_address(0)
 158
 159 /*
 160  * IRIX (BSD) quotactl makes use of separate commands for user/group,
 161  * whereas on Linux the syscall encodes this information into the cmd
 162  * field (see the QCMD macro in quota.h).  These macros help keep the
 163  * code portable - they are not visible from the syscall interface.
 164  */
 165 #define Q_XSETGQLIM     XQM_CMD(8)      /* set groups disk limits */
 166 #define Q_XGETGQUOTA    XQM_CMD(9)      /* get groups disk limits */
 167 #define Q_XSETPQLIM     XQM_CMD(10)     /* set projects disk limits */
 168 #define Q_XGETPQUOTA    XQM_CMD(11)     /* get projects disk limits */
 169
 170 #define dfltprid        0
 171 #define MAXPATHLEN      1024
 172
 173 #define MIN(a,b)        (min(a,b))
 174 #define MAX(a,b)        (max(a,b))
 175 #define howmany(x, y)   (((x)+((y)-1))/(y))
 176
 177 /*
 178  * Various platform dependent calls that don't fit anywhere else
 179  */
 180 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 181 #define xfs_stack_trace()       dump_stack()
 182 #define xfs_itruncate_data(ip, off)     \
 183         (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
 184
 185
 186 /* Move the kernel do_div definition off to one side */
 187
 188 #if defined __i386__
 189 /* For ia32 we need to pull some tricks to get past various versions
 190  * of the compiler which do not like us using do_div in the middle
 191  * of large functions.
 192  */
 193 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 194 {
 195         __u32   mod;
 196
 197         switch (n) {
 198                 case 4:
 199                         mod = *(__u32 *)a % b;
 200                         *(__u32 *)a = *(__u32 *)a / b;
 201                         return mod;
 202                 case 8:
 203                         {
 204                         unsigned long __upper, __low, __high, __mod;
 205                         __u64   c = *(__u64 *)a;
 206                         __upper = __high = c >> 32;
 207                         __low = c;
 208                         if (__high) {
 209                                 __upper = __high % (b);
 210                                 __high = __high / (b);
 211                         }
 212                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 213                         asm("":"=A" (c):"a" (__low),"d" (__high));
 214                         *(__u64 *)a = c;
 215                         return __mod;
 216                         }
 217         }
 218
 219         /* NOTREACHED */
 220         return 0;
 221 }
 222
 223 /* Side effect free 64 bit mod operation */
 224 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 225 {
 226         switch (n) {
 227                 case 4:
 228                         return *(__u32 *)a % b;
 229                 case 8:
 230                         {
 231                         unsigned long __upper, __low, __high, __mod;
 232                         __u64   c = *(__u64 *)a;
 233                         __upper = __high = c >> 32;
 234                         __low = c;
 235                         if (__high) {
 236                                 __upper = __high % (b);
 237                                 __high = __high / (b);
 238                         }
 239                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 240                         asm("":"=A" (c):"a" (__low),"d" (__high));
 241                         return __mod;
 242                         }
 243         }
 244
 245         /* NOTREACHED */
 246         return 0;
 247 }
 248 #else
 249 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 250 {
 251         __u32   mod;
 252
 253         switch (n) {
 254                 case 4:
 255                         mod = *(__u32 *)a % b;
 256                         *(__u32 *)a = *(__u32 *)a / b;
 257                         return mod;
 258                 case 8:
 259                         mod = do_div(*(__u64 *)a, b);
 260                         return mod;
 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                         __u64   c = *(__u64 *)a;
 276                         return do_div(c, b);
 277                         }
 278         }
 279
 280         /* NOTREACHED */
 281         return 0;
 282 }
 283 #endif
 284
 285 #undef do_div
 286 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 287 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 288
 289 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 290 {
 291         x += y - 1;
 292         do_div(x, y);
 293         return(x * y);
 294 }
 295
 296 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 297 {
 298         x += y - 1;
 299         do_div(x, y);
 300         return x;
 301 }
 302
 303 #endif /* __XFS_LINUX__ */