fs/xfs/linux/xfs_linux.h

   1 /*
   2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_LINUX__
  33 #define __XFS_LINUX__
  34
  35 #include <linux/mm.h>
  36 #include <linux/kernel.h>
  37 #include <linux/slab.h>
  38 #include <linux/module.h>
  39 #include <linux/file.h>
  40 #include <linux/swap.h>
  41 #include <linux/errno.h>
  42 #include <linux/sched.h>
  43 #include <linux/bitops.h>
  44 #include <linux/major.h>
  45 #include <linux/pagemap.h>
  46 #include <linux/vfs.h>
  47
  48 #include <asm/page.h>
  49 #include <asm/div64.h>
  50 #include <asm/param.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53
  54 #include <linux/xfs_behavior.h>
  55 #include <linux/xfs_vfs.h>
  56 #include <linux/xfs_cred.h>
  57 #include <linux/xfs_vnode.h>
  58 #include <linux/xfs_stats.h>
  59 #include <linux/xfs_sysctl.h>
  60 #include <linux/xfs_iops.h>
  61 #include <linux/xfs_super.h>
  62 #include <linux/xfs_globals.h>
  63 #include <linux/xfs_fs_subr.h>
  64 #include <linux/xfs_lrw.h>
  65
  66 #include <pagebuf/page_buf.h>
  67
  68 #ifndef STATIC
  69 #define STATIC static
  70 #endif
  71
  72 #define restricted_chown        xfs_params.restrict_chown
  73 #define irix_sgid_inherit       xfs_params.sgid_inherit
  74 #define irix_symlink_mode       xfs_params.symlink_mode
  75 #define xfs_panic_mask          xfs_params.panic_mask
  76
  77 typedef struct xfs_dirent {             /* data from readdir() */
  78         xfs_ino_t       d_ino;          /* inode number of entry */
  79         xfs_off_t       d_off;          /* offset of disk directory entry */
  80         unsigned short  d_reclen;       /* length of this record */
  81         char            d_name[1];      /* name of file */
  82 } xfs_dirent_t;
  83
  84 #define DIRENTBASESIZE          (((xfs_dirent_t *)0)->d_name - (char *)0)
  85 #define DIRENTSIZE(namelen)     \
  86         ((DIRENTBASESIZE + (namelen) + \
  87                 sizeof(xfs_off_t)) & ~(sizeof(xfs_off_t) - 1))
  88
  89 #define NBPP            PAGE_SIZE
  90 #define DPPSHFT         (PAGE_SHIFT - 9)
  91 #define NDPP            (1 << (PAGE_SHIFT - 9))
  92 #define dtop(DD)        (((DD) + NDPP - 1) >> DPPSHFT)
  93 #define dtopt(DD)       ((DD) >> DPPSHFT)
  94 #define dpoff(DD)       ((DD) & (NDPP-1))
  95
  96 #define NBBY            8               /* number of bits per byte */
  97 #define NBPC            PAGE_SIZE       /* Number of bytes per click */
  98 #define BPCSHIFT        PAGE_SHIFT      /* LOG2(NBPC) if exact */
  99
 100 /*
 101  * Size of block device i/o is parameterized here.
 102  * Currently the system supports page-sized i/o.
 103  */
 104 #define BLKDEV_IOSHIFT          BPCSHIFT
 105 #define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 106 /* number of BB's per block device block */
 107 #define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 108
 109 /* bytes to clicks */
 110 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 111 #define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
 112 #define btoc64(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
 113 #define btoct64(x)      ((__uint64_t)(x)>>BPCSHIFT)
 114 #define io_btoc(x)      (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT)
 115 #define io_btoct(x)     ((__psunsigned_t)(x)>>IO_BPCSHIFT)
 116
 117 /* off_t bytes to clicks */
 118 #define offtoc(x)       (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
 119 #define offtoct(x)      ((xfs_off_t)(x)>>BPCSHIFT)
 120
 121 /* clicks to off_t bytes */
 122 #define ctooff(x)       ((xfs_off_t)(x)<<BPCSHIFT)
 123
 124 /* clicks to bytes */
 125 #define ctob(x)         ((__psunsigned_t)(x)<<BPCSHIFT)
 126 #define btoct(x)        ((__psunsigned_t)(x)>>BPCSHIFT)
 127 #define ctob64(x)       ((__uint64_t)(x)<<BPCSHIFT)
 128 #define io_ctob(x)      ((__psunsigned_t)(x)<<IO_BPCSHIFT)
 129
 130 /* bytes to clicks */
 131 #define btoc(x)         (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
 132
 133 #ifndef CELL_CAPABLE
 134 #define FSC_NOTIFY_NAME_CHANGED(vp)
 135 #endif
 136
 137 #ifndef ENOATTR
 138 #define ENOATTR         ENODATA         /* Attribute not found */
 139 #endif
 140
 141 /* Note: EWRONGFS never visible outside the kernel */
 142 #define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 143
 144 /*
 145  * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't
 146  *     return codes out of its known range in errno.
 147  * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't
 148  *     conflict with any code we use already or any code a driver may use)
 149  * XXX Some options (currently we do #2):
 150  *      1/ New error code ["Filesystem is corrupted", _after_ glibc updated]
 151  *      2/ 990 ["Unknown error 990"]
 152  *      3/ EUCLEAN ["Structure needs cleaning"]
 153  *      4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace]
 154  */
 155 #define EFSCORRUPTED    990             /* Filesystem is corrupted */
 156
 157 #define SYNCHRONIZE()   barrier()
 158 #define __return_address __builtin_return_address(0)
 159
 160 /* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */
 161 /* we may well need to fine-tune this if it ever becomes an issue.  */
 162 #define DQUOT_MAX_HEURISTIC     1024    /* NR_DQUOTS */
 163 #define ndquot                  DQUOT_MAX_HEURISTIC
 164
 165 /* IRIX uses the current size of the name cache to guess a good value */
 166 /* - this isn't the same but is a good enough starting point for now. */
 167 #define DQUOT_HASH_HEURISTIC    files_stat.nr_files
 168
 169 /* IRIX inodes maintain the project ID also, zero this field on Linux */
 170 #define DEFAULT_PROJID  0
 171 #define dfltprid        DEFAULT_PROJID
 172
 173 #define MAXPATHLEN      1024
 174
 175 #define FINVIS          0x0100  /* don't update timestamps - XFS */
 176
 177 #define MIN(a,b)        (min(a,b))
 178 #define MAX(a,b)        (max(a,b))
 179 #define howmany(x, y)   (((x)+((y)-1))/(y))
 180 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 181
 182 /* Move the kernel do_div definition off to one side */
 183
 184 #if defined __i386__
 185 /* For ia32 we need to pull some tricks to get past various versions
 186  * of the compiler which do not like us using do_div in the middle
 187  * of large functions.
 188  */
 189 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 190 {
 191         __u32   mod;
 192
 193         switch (n) {
 194                 case 4:
 195                         mod = *(__u32 *)a % b;
 196                         *(__u32 *)a = *(__u32 *)a / b;
 197                         return mod;
 198                 case 8:
 199                         {
 200                         unsigned long __upper, __low, __high, __mod;
 201                         __u64   c = *(__u64 *)a;
 202                         __upper = __high = c >> 32;
 203                         __low = c;
 204                         if (__high) {
 205                                 __upper = __high % (b);
 206                                 __high = __high / (b);
 207                         }
 208                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 209                         asm("":"=A" (c):"a" (__low),"d" (__high));
 210                         *(__u64 *)a = c;
 211                         return __mod;
 212                         }
 213         }
 214
 215         /* NOTREACHED */
 216         return 0;
 217 }
 218
 219 /* Side effect free 64 bit mod operation */
 220 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 221 {
 222         switch (n) {
 223                 case 4:
 224                         return *(__u32 *)a % b;
 225                 case 8:
 226                         {
 227                         unsigned long __upper, __low, __high, __mod;
 228                         __u64   c = *(__u64 *)a;
 229                         __upper = __high = c >> 32;
 230                         __low = c;
 231                         if (__high) {
 232                                 __upper = __high % (b);
 233                                 __high = __high / (b);
 234                         }
 235                         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 236                         asm("":"=A" (c):"a" (__low),"d" (__high));
 237                         return __mod;
 238                         }
 239         }
 240
 241         /* NOTREACHED */
 242         return 0;
 243 }
 244 #else
 245 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 246 {
 247         __u32   mod;
 248
 249         switch (n) {
 250                 case 4:
 251                         mod = *(__u32 *)a % b;
 252                         *(__u32 *)a = *(__u32 *)a / b;
 253                         return mod;
 254                 case 8:
 255                         mod = do_div(*(__u64 *)a, b);
 256                         return mod;
 257         }
 258
 259         /* NOTREACHED */
 260         return 0;
 261 }
 262
 263 /* Side effect free 64 bit mod operation */
 264 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 265 {
 266         switch (n) {
 267                 case 4:
 268                         return *(__u32 *)a % b;
 269                 case 8:
 270                         {
 271                         __u64   c = *(__u64 *)a;
 272                         return do_div(c, b);
 273                         }
 274         }
 275
 276         /* NOTREACHED */
 277         return 0;
 278 }
 279 #endif
 280
 281 #undef do_div
 282 #define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 283 #define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 284
 285 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 286 {
 287         x += y - 1;
 288         do_div(x, y);
 289         return(x * y);
 290 }
 291
 292 #endif /* __XFS_LINUX__ */