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 #include <linux/config.h>
  23
  24 /*
  25  * Some types are conditional depending on the target system.
  26  * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
  27  * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
  28  * as requiring XFS_BIG_BLKNOS to be set.
  29  */
  30 #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
  31 # define XFS_BIG_BLKNOS 1
  32 # if BITS_PER_LONG == 64
  33 #  define XFS_BIG_INUMS 1
  34 # else
  35 #  define XFS_BIG_INUMS 0
  36 # endif
  37 #else
  38 # define XFS_BIG_BLKNOS 0
  39 # define XFS_BIG_INUMS  0
  40 #endif
  41
  42 #include <xfs_types.h>
  43 #include <xfs_arch.h>
  44
  45 #include <kmem.h>
  46 #include <mrlock.h>
  47 #include <spin.h>
  48 #include <sv.h>
  49 #include <mutex.h>
  50 #include <sema.h>
  51 #include <time.h>
  52
  53 #include <support/ktrace.h>
  54 #include <support/debug.h>
  55 #include <support/move.h>
  56 #include <support/uuid.h>
  57
  58 #include <linux/mm.h>
  59 #include <linux/kernel.h>
  60 #include <linux/blkdev.h>
  61 #include <linux/slab.h>
  62 #include <linux/module.h>
  63 #include <linux/file.h>
  64 #include <linux/swap.h>
  65 #include <linux/errno.h>
  66 #include <linux/sched.h>
  67 #include <linux/bitops.h>
  68 #include <linux/major.h>
  69 #include <linux/pagemap.h>
  70 #include <linux/vfs.h>
  71 #include <linux/seq_file.h>
  72 #include <linux/init.h>
  73 #include <linux/list.h>
  74 #include <linux/proc_fs.h>
  75 #include <linux/sort.h>
  76 #include <linux/cpu.h>
  77 #include <linux/notifier.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 #ifdef CONFIG_SMP
 106 #define HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 107 #else
 108 #undef  HAVE_PERCPU_SB  /* per cpu superblock counters are a 2.6 feature */
 109 #endif
 110
 111 /*
 112  * State flag for unwritten extent buffers.
 113  *
 114  * We need to be able to distinguish between these and delayed
 115  * allocate buffers within XFS.  The generic IO path code does
 116  * not need to distinguish - we use the BH_Delay flag for both
 117  * delalloc and these ondisk-uninitialised buffers.
 118  */
 119 BUFFER_FNS(PrivateStart, unwritten);
 120
 121 #define restricted_chown        xfs_params.restrict_chown.val
 122 #define irix_sgid_inherit       xfs_params.sgid_inherit.val
 123 #define irix_symlink_mode       xfs_params.symlink_mode.val
 124 #define xfs_panic_mask          xfs_params.panic_mask.val
 125 #define xfs_error_level         xfs_params.error_level.val
 126 #define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 127 #define xfs_stats_clear         xfs_params.stats_clear.val
 128 #define xfs_inherit_sync        xfs_params.inherit_sync.val
 129 #define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 130 #define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 131 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
 132 #define xfs_buf_age_centisecs   xfs_params.xfs_buf_age.val
 133 #define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 134 #define xfs_rotorstep           xfs_params.rotorstep.val
 135
 136 #ifndef raw_smp_processor_id
 137 #define raw_smp_processor_id()  smp_processor_id()
 138 #endif
 139 #define current_cpu()           raw_smp_processor_id()
 140 #define current_pid()           (current->pid)
 141 #define current_fsuid(cred)     (current->fsuid)
 142 #define current_fsgid(cred)     (current->fsgid)
 143
 144 #define NBPP            PAGE_SIZE
 145 #define DPPSHFT         (PAGE_SHIFT - 9)
 146 #define NDPP            (1 << (PAGE_SHIFT - 9))
 147 #define dtop(DD)        (((DD) + NDPP - 1) >> DPPSHFT)
 148 #define dtopt(DD)       ((DD) >> DPPSHFT)
 149 #define dpoff(DD)       ((DD) & (NDPP-1))
 150
 151 #define NBBY            8               /* number of bits per byte */
 152 #define NBPC            PAGE_SIZE       /* Number of bytes per click */
 153 #define BPCSHIFT        PAGE_SHIFT      /* LOG2(NBPC) if exact */
 154
 155 /*
 156  * Size of block device i/o is parameterized here.
 157  * Currently the system supports page-sized i/o.
 158  */
 159 #define BLKDEV_IOSHIFT          BPCSHIFT
 160 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 161 /* number of BB's per block device block */
 162 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 163
 164 /* bytes to clicks */
 165 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 166 #define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
 167 #define btoc64(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
 168 #define btoct64(x)      ((__uint64_t)(x)>>BPCSHIFT)
 169 #define io_btoc(x)      (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
 170 #define io_btoct(x)     ((__psunsigned_t)(x)>>IO_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 #define io_ctob(x)      ((__psunsigned_t)(x)<<IO_BPCSHIFT)
 184
 185 /* bytes to clicks */
 186 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 187
 188 #ifndef ENOATTR
 189 #define ENOATTR         ENODATA         /* Attribute not found */
 190 #endif
 191
 192 /* Note: EWRONGFS never visible outside the kernel */
 193 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 194
 195 /*
 196  * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
 197  *     return codes out of its known range in errno.
 198  * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
 199  *     conflict with any code we use already or any code a driver may use)
 200  * XXX Some options (currently we do #2):
 201  *      1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
 202  *      2/ 990 ["Unknown error 990"]
 203  *      3/ EUCLEAN ["Structure needs cleaning"]
 204  *      4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
 205  */
 206 #define EFSCORRUPTED    990             /* Filesystem is corrupted */
 207
 208 #define SYNCHRONIZE()   barrier()
 209 #define __return_address __builtin_return_address(0)
 210
 211 /*
 212  * IRIX (BSD) quotactl makes use of separate commands for user/group,
 213  * whereas on Linux the syscall encodes this information into the cmd
 214  * field (see the QCMD macro in quota.h).  These macros help keep the
 215  * code portable - they are not visible from the syscall interface.
 216  */
 217 #define Q_XSETGQLIM     XQM_CMD(8)      /* set groups disk limits */
 218 #define Q_XGETGQUOTA    XQM_CMD(9)      /* get groups disk limits */
 219 #define Q_XSETPQLIM     XQM_CMD(10)     /* set projects disk limits */
 220 #define Q_XGETPQUOTA    XQM_CMD(11)     /* get projects disk limits */
 221
 222 #define dfltprid        0
 223 #define MAXPATHLEN      1024
 224
 225 #define MIN(a,b)        (min(a,b))
 226 #define MAX(a,b)        (max(a,b))
 227 #define howmany(x, y)   (((x)+((y)-1))/(y))
 228 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 229
 230 /*
 231  * Various platform dependent calls that don't fit anywhere else
 232  */
 233 #define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 234 #define xfs_stack_trace()       dump_stack()
 235 #define xfs_itruncate_data(ip, off)     \
 236         (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off)))
 237 #define xfs_statvfs_fsid(statp, mp)     \
 238         ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
 239            __kernel_fsid_t *fsid = &(statp)->f_fsid;    \
 240         (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
 241
 242
 243 /* Move the kernel do_div definition off to one side */
 244
 245 #if defined __i386__
 246 /* For ia32 we need to pull some tricks to get past various versions
 247  * of the compiler which do not like us using do_div in the middle
 248  * of large functions.
 249  */
 250 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 251 {
 252         __u32   mod;
 253
 254         switch (n) {
 255                 case 4:
 256                         mod = *(__u32 *)a % b;
 257                         *(__u32 *)a = *(__u32 *)a / b;
 258                         return mod;
 259                 case 8:
 260                         {
 261                         unsigned long __upper, __low, __high, __mod;
 262                         __u64   c = *(__u64 *)a;
 263                         __upper = __high = c >> 32;
 264                         __low = c;
 265                         if (__high) {
 266                                 __upper = __high % (b);
 267                                 __high = __high / (b);
 268                         }
 269                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 270                         asm("":"=A" (c):"a" (__low),"d" (__high));
 271                         *(__u64 *)a = c;
 272                         return __mod;
 273                         }
 274         }
 275
 276         /* NOTREACHED */
 277         return 0;
 278 }
 279
 280 /* Side effect free 64 bit mod operation */
 281 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 282 {
 283         switch (n) {
 284                 case 4:
 285                         return *(__u32 *)a % b;
 286                 case 8:
 287                         {
 288                         unsigned long __upper, __low, __high, __mod;
 289                         __u64   c = *(__u64 *)a;
 290                         __upper = __high = c >> 32;
 291                         __low = c;
 292                         if (__high) {
 293                                 __upper = __high % (b);
 294                                 __high = __high / (b);
 295                         }
 296                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 297                         asm("":"=A" (c):"a" (__low),"d" (__high));
 298                         return __mod;
 299                         }
 300         }
 301
 302         /* NOTREACHED */
 303         return 0;
 304 }
 305 #else
 306 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 307 {
 308         __u32   mod;
 309
 310         switch (n) {
 311                 case 4:
 312                         mod = *(__u32 *)a % b;
 313                         *(__u32 *)a = *(__u32 *)a / b;
 314                         return mod;
 315                 case 8:
 316                         mod = do_div(*(__u64 *)a, b);
 317                         return mod;
 318         }
 319
 320         /* NOTREACHED */
 321         return 0;
 322 }
 323
 324 /* Side effect free 64 bit mod operation */
 325 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 326 {
 327         switch (n) {
 328                 case 4:
 329                         return *(__u32 *)a % b;
 330                 case 8:
 331                         {
 332                         __u64   c = *(__u64 *)a;
 333                         return do_div(c, b);
 334                         }
 335         }
 336
 337         /* NOTREACHED */
 338         return 0;
 339 }
 340 #endif
 341
 342 #undef do_div
 343 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 344 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 345
 346 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 347 {
 348         x += y - 1;
 349         do_div(x, y);
 350         return(x * y);
 351 }
 352
 353 #endif /* __XFS_LINUX__ */