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 <spin.h>
  47 #include <sv.h>
  48 #include <mutex.h>
  49 #include <sema.h>
  50 #include <time.h>
  51
  52 #include <support/ktrace.h>
  53 #include <support/debug.h>
  54 #include <support/move.h>
  55 #include <support/uuid.h>
  56
  57 #include <linux/mm.h>
  58 #include <linux/kernel.h>
  59 #include <linux/blkdev.h>
  60 #include <linux/slab.h>
  61 #include <linux/module.h>
  62 #include <linux/file.h>
  63 #include <linux/swap.h>
  64 #include <linux/errno.h>
  65 #include <linux/sched.h>
  66 #include <linux/bitops.h>
  67 #include <linux/major.h>
  68 #include <linux/pagemap.h>
  69 #include <linux/vfs.h>
  70 #include <linux/seq_file.h>
  71 #include <linux/init.h>
  72 #include <linux/list.h>
  73 #include <linux/proc_fs.h>
  74 #include <linux/sort.h>
  75 #include <linux/cpu.h>
  76 #include <linux/notifier.h>
  77 #include <linux/delay.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_behavior.h>
  87 #include <xfs_vfs.h>
  88 #include <xfs_cred.h>
  89 #include <xfs_vnode.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_globals.h>
  96 #include <xfs_fs_subr.h>
  97 #include <xfs_lrw.h>
  98 #include <xfs_buf.h>
  99
 100 /*
 101  * Feature macros (disable/enable)
 102  */
 103 #undef  HAVE_REFCACHE   /* reference cache not needed for NFS in 2.6 */
 104 #define HAVE_SENDFILE   /* sendfile(2) exists in 2.6, but not in 2.4 */
 105 #define HAVE_SPLICE     /* a splice(2) exists in 2.6, but not in 2.4 */
 106 #ifdef CONFIG_SMP
 107 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 108 #else
 109 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 110 #endif
 111
 112 /*
 113  * State flag for unwritten extent buffers.
 114  *
 115  * We need to be able to distinguish between these and delayed
 116  * allocate buffers within XFS.  The generic IO path code does
 117  * not need to distinguish - we use the BH_Delay flag for both
 118  * delalloc and these ondisk-uninitialised buffers.
 119  */
 120 BUFFER_FNS(PrivateStart, unwritten);
 121
 122 #define restricted_chown        xfs_params.restrict_chown.val
 123 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 124 #define irix_symlink_mode       xfs_params.symlink_mode.val
 125 #define xfs_panic_mask          xfs_params.panic_mask.val
 126 #define xfs_error_level         xfs_params.error_level.val
 127 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 128 #define xfs_stats_clear         xfs_params.stats_clear.val
 129 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 130 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 131 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 132 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 133 #define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 134 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 135 #define xfs_rotorstep           xfs_params.rotorstep.val
 136 #define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 137
 138 #define current_cpu()           (raw_smp_processor_id())
 139 #define current_pid()           (current->pid)
 140 #define current_fsuid(cred)     (current->fsuid)
 141 #define current_fsgid(cred)     (current->fsgid)
 142 #define current_test_flags(f)   (current->flags & (f))
 143 #define current_set_flags_nested(sp, f)         \
 144                 (*(sp) = current->flags, current->flags |= (f))
 145 #define current_clear_flags_nested(sp, f)       \
 146                 (*(sp) = current->flags, current->flags &= ~(f))
 147 #define current_restore_flags_nested(sp, f)     \
 148                 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 149
 150 #define NBPP            PAGE_SIZE
 151 #define NDPP            (1 << (PAGE_SHIFT - 9))
 152
 153 #define NBBY            8               /* number of bits per byte */
 154 #define NBPC            PAGE_SIZE       /* Number of bytes per click */
 155 #define BPCSHIFT        PAGE_SHIFT      /* LOG2(NBPC) if exact */
 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          BPCSHIFT
 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 /* bytes to clicks */
 167 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 168 #define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
 169 #define btoc64(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
 170 #define btoct64(x)      ((__uint64_t)(x)>>BPCSHIFT)
 171
 172 /* off_t bytes to clicks */
 173 #define offtoc(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
 174 #define offtoct(x)      ((xfs_off_t)(x)>>BPCSHIFT)
 175
 176 /* clicks to off_t bytes */
 177 #define ctooff(x)       ((xfs_off_t)(x)<<BPCSHIFT)
 178
 179 /* clicks to bytes */
 180 #define ctob(x)         ((__psunsigned_t)(x)<<BPCSHIFT)
 181 #define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
 182 #define ctob64(x)       ((__uint64_t)(x)<<BPCSHIFT)
 183
 184 /* bytes to clicks */
 185 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 186
 187 #define ENOATTR         ENODATA         /* Attribute not found */
 188 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 189 #define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 190
 191 #define SYNCHRONIZE()   barrier()
 192 #define __return_address __builtin_return_address(0)
 193
 194 /*
 195  * IRIX (BSD) quotactl makes use of separate commands for user/group,
 196  * whereas on Linux the syscall encodes this information into the cmd
 197  * field (see the QCMD macro in quota.h).  These macros help keep the
 198  * code portable - they are not visible from the syscall interface.
 199  */
 200 #define Q_XSETGQLIM     XQM_CMD(8)      /* set groups disk limits */
 201 #define Q_XGETGQUOTA    XQM_CMD(9)      /* get groups disk limits */
 202 #define Q_XSETPQLIM     XQM_CMD(10)     /* set projects disk limits */
 203 #define Q_XGETPQUOTA    XQM_CMD(11)     /* get projects disk limits */
 204
 205 #define dfltprid        0
 206 #define MAXPATHLEN      1024
 207
 208 #define MIN(a,b)        (min(a,b))
 209 #define MAX(a,b)        (max(a,b))
 210 #define howmany(x, y)   (((x)+((y)-1))/(y))
 211
 212 /*
 213  * Various platform dependent calls that don't fit anywhere else
 214  */
 215 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 216 #define xfs_stack_trace()       dump_stack()
 217 #define xfs_itruncate_data(ip, off)     \
 218         (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
 219 #define xfs_statvfs_fsid(statp, mp)     \
 220         ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
 221            __kernel_fsid_t *fsid = &(statp)->f_fsid;    \
 222         (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
 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 #endif /* __XFS_LINUX__ */