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 * Kernel specific type declarations for XFS
  25 */
  26typedef signed char             __int8_t;
  27typedef unsigned char           __uint8_t;
  28typedef signed short int        __int16_t;
  29typedef unsigned short int      __uint16_t;
  30typedef signed int              __int32_t;
  31typedef unsigned int            __uint32_t;
  32typedef signed long long int    __int64_t;
  33typedef unsigned long long int  __uint64_t;
  34
  35typedef __s64                   xfs_off_t;      /* <file offset> type */
  36typedef unsigned long long      xfs_ino_t;      /* <inode> type */
  37typedef __s64                   xfs_daddr_t;    /* <disk address> type */
  38typedef __u32                   xfs_dev_t;
  39typedef __u32                   xfs_nlink_t;
  40
  41#include "xfs_types.h"
  42
  43#include "kmem.h"
  44#include "mrlock.h"
  45#include "uuid.h"
  46
  47#include <linux/semaphore.h>
  48#include <linux/mm.h>
  49#include <linux/kernel.h>
  50#include <linux/blkdev.h>
  51#include <linux/slab.h>
  52#include <linux/crc32c.h>
  53#include <linux/module.h>
  54#include <linux/mutex.h>
  55#include <linux/file.h>
  56#include <linux/swap.h>
  57#include <linux/errno.h>
  58#include <linux/sched.h>
  59#include <linux/bitops.h>
  60#include <linux/major.h>
  61#include <linux/pagemap.h>
  62#include <linux/vfs.h>
  63#include <linux/seq_file.h>
  64#include <linux/init.h>
  65#include <linux/list.h>
  66#include <linux/proc_fs.h>
  67#include <linux/sort.h>
  68#include <linux/cpu.h>
  69#include <linux/notifier.h>
  70#include <linux/delay.h>
  71#include <linux/log2.h>
  72#include <linux/spinlock.h>
  73#include <linux/random.h>
  74#include <linux/ctype.h>
  75#include <linux/writeback.h>
  76#include <linux/capability.h>
  77#include <linux/kthread.h>
  78#include <linux/freezer.h>
  79#include <linux/list_sort.h>
  80#include <linux/ratelimit.h>
  81
  82#include <asm/page.h>
  83#include <asm/div64.h>
  84#include <asm/param.h>
  85#include <asm/uaccess.h>
  86#include <asm/byteorder.h>
  87#include <asm/unaligned.h>
  88
  89#include "xfs_fs.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_cksum.h"
  96#include "xfs_buf.h"
  97#include "xfs_message.h"
  98
  99#ifdef __BIG_ENDIAN
 100#define XFS_NATIVE_HOST 1
 101#else
 102#undef XFS_NATIVE_HOST
 103#endif
 104
 105#define irix_sgid_inherit       xfs_params.sgid_inherit.val
 106#define irix_symlink_mode       xfs_params.symlink_mode.val
 107#define xfs_panic_mask          xfs_params.panic_mask.val
 108#define xfs_error_level         xfs_params.error_level.val
 109#define xfs_syncd_centisecs     xfs_params.syncd_timer.val
 110#define xfs_stats_clear         xfs_params.stats_clear.val
 111#define xfs_inherit_sync        xfs_params.inherit_sync.val
 112#define xfs_inherit_nodump      xfs_params.inherit_nodump.val
 113#define xfs_inherit_noatime     xfs_params.inherit_noatim.val
 114#define xfs_inherit_nosymlinks  xfs_params.inherit_nosym.val
 115#define xfs_rotorstep           xfs_params.rotorstep.val
 116#define xfs_inherit_nodefrag    xfs_params.inherit_nodfrg.val
 117#define xfs_fstrm_centisecs     xfs_params.fstrm_timer.val
 118#define xfs_eofb_secs           xfs_params.eofb_timer.val
 119
 120#define current_cpu()           (raw_smp_processor_id())
 121#define current_pid()           (current->pid)
 122#define current_test_flags(f)   (current->flags & (f))
 123#define current_set_flags_nested(sp, f)         \
 124                (*(sp) = current->flags, current->flags |= (f))
 125#define current_clear_flags_nested(sp, f)       \
 126                (*(sp) = current->flags, current->flags &= ~(f))
 127#define current_restore_flags_nested(sp, f)     \
 128                (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
 129
 130#define spinlock_destroy(lock)
 131
 132#define NBBY            8               /* number of bits per byte */
 133
 134/*
 135 * Size of block device i/o is parameterized here.
 136 * Currently the system supports page-sized i/o.
 137 */
 138#define BLKDEV_IOSHIFT          PAGE_SHIFT
 139#define BLKDEV_IOSIZE           (1<<BLKDEV_IOSHIFT)
 140/* number of BB's per block device block */
 141#define BLKDEV_BB               BTOBB(BLKDEV_IOSIZE)
 142
 143#define ENOATTR         ENODATA         /* Attribute not found */
 144#define EWRONGFS        EINVAL          /* Mount with wrong filesystem type */
 145#define EFSCORRUPTED    EUCLEAN         /* Filesystem is corrupted */
 146#define EFSBADCRC       EBADMSG         /* Bad CRC detected */
 147
 148#define SYNCHRONIZE()   barrier()
 149#define __return_address __builtin_return_address(0)
 150
 151#define XFS_PROJID_DEFAULT      0
 152#define MAXPATHLEN      1024
 153
 154#define MIN(a,b)        (min(a,b))
 155#define MAX(a,b)        (max(a,b))
 156#define howmany(x, y)   (((x)+((y)-1))/(y))
 157
 158static inline void delay(long ticks)
 159{
 160        schedule_timeout_uninterruptible(ticks);
 161}
 162
 163/*
 164 * XFS wrapper structure for sysfs support. It depends on external data
 165 * structures and is embedded in various internal data structures to implement
 166 * the XFS sysfs object heirarchy. Define it here for broad access throughout
 167 * the codebase.
 168 */
 169struct xfs_kobj {
 170        struct kobject          kobject;
 171        struct completion       complete;
 172};
 173
 174struct xstats {
 175        struct xfsstats __percpu        *xs_stats;
 176        struct xfs_kobj                 xs_kobj;
 177};
 178
 179extern struct xstats xfsstats;
 180
 181/* Kernel uid/gid conversion. These are used to convert to/from the on disk
 182 * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
 183 * The conversion here is type only, the value will remain the same since we
 184 * are converting to the init_user_ns. The uid is later mapped to a particular
 185 * user namespace value when crossing the kernel/user boundary.
 186 */
 187static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
 188{
 189        return from_kuid(&init_user_ns, uid);
 190}
 191
 192static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
 193{
 194        return make_kuid(&init_user_ns, uid);
 195}
 196
 197static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
 198{
 199        return from_kgid(&init_user_ns, gid);
 200}
 201
 202static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
 203{
 204        return make_kgid(&init_user_ns, gid);
 205}
 206
 207/*
 208 * Various platform dependent calls that don't fit anywhere else
 209 */
 210#define xfs_sort(a,n,s,fn)      sort(a,n,s,fn,NULL)
 211#define xfs_stack_trace()       dump_stack()
 212
 213
 214/* Move the kernel do_div definition off to one side */
 215
 216#if defined __i386__
 217/* For ia32 we need to pull some tricks to get past various versions
 218 * of the compiler which do not like us using do_div in the middle
 219 * of large functions.
 220 */
 221static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 222{
 223        __u32   mod;
 224
 225        switch (n) {
 226                case 4:
 227                        mod = *(__u32 *)a % b;
 228                        *(__u32 *)a = *(__u32 *)a / b;
 229                        return mod;
 230                case 8:
 231                        {
 232                        unsigned long __upper, __low, __high, __mod;
 233                        __u64   c = *(__u64 *)a;
 234                        __upper = __high = c >> 32;
 235                        __low = c;
 236                        if (__high) {
 237                                __upper = __high % (b);
 238                                __high = __high / (b);
 239                        }
 240                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 241                        asm("":"=A" (c):"a" (__low),"d" (__high));
 242                        *(__u64 *)a = c;
 243                        return __mod;
 244                        }
 245        }
 246
 247        /* NOTREACHED */
 248        return 0;
 249}
 250
 251/* Side effect free 64 bit mod operation */
 252static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 253{
 254        switch (n) {
 255                case 4:
 256                        return *(__u32 *)a % b;
 257                case 8:
 258                        {
 259                        unsigned long __upper, __low, __high, __mod;
 260                        __u64   c = *(__u64 *)a;
 261                        __upper = __high = c >> 32;
 262                        __low = c;
 263                        if (__high) {
 264                                __upper = __high % (b);
 265                                __high = __high / (b);
 266                        }
 267                        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
 268                        asm("":"=A" (c):"a" (__low),"d" (__high));
 269                        return __mod;
 270                        }
 271        }
 272
 273        /* NOTREACHED */
 274        return 0;
 275}
 276#else
 277static inline __u32 xfs_do_div(void *a, __u32 b, int n)
 278{
 279        __u32   mod;
 280
 281        switch (n) {
 282                case 4:
 283                        mod = *(__u32 *)a % b;
 284                        *(__u32 *)a = *(__u32 *)a / b;
 285                        return mod;
 286                case 8:
 287                        mod = do_div(*(__u64 *)a, b);
 288                        return mod;
 289        }
 290
 291        /* NOTREACHED */
 292        return 0;
 293}
 294
 295/* Side effect free 64 bit mod operation */
 296static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
 297{
 298        switch (n) {
 299                case 4:
 300                        return *(__u32 *)a % b;
 301                case 8:
 302                        {
 303                        __u64   c = *(__u64 *)a;
 304                        return do_div(c, b);
 305                        }
 306        }
 307
 308        /* NOTREACHED */
 309        return 0;
 310}
 311#endif
 312
 313#undef do_div
 314#define do_div(a, b)    xfs_do_div(&(a), (b), sizeof(a))
 315#define do_mod(a, b)    xfs_do_mod(&(a), (b), sizeof(a))
 316
 317static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
 318{
 319        x += y - 1;
 320        do_div(x, y);
 321        return x * y;
 322}
 323
 324static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
 325{
 326        x += y - 1;
 327        do_div(x, y);
 328        return x;
 329}
 330
 331/* ARM old ABI has some weird alignment/padding */
 332#if defined(__arm__) && !defined(__ARM_EABI__)
 333#define __arch_pack __attribute__((packed))
 334#else
 335#define __arch_pack
 336#endif
 337
 338#define ASSERT_ALWAYS(expr)     \
 339        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 340
 341#ifdef DEBUG
 342#define ASSERT(expr)    \
 343        (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
 344
 345#ifndef STATIC
 346# define STATIC noinline
 347#endif
 348
 349#else   /* !DEBUG */
 350
 351#ifdef XFS_WARN
 352
 353#define ASSERT(expr)    \
 354        (unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
 355
 356#ifndef STATIC
 357# define STATIC static noinline
 358#endif
 359
 360#else   /* !DEBUG && !XFS_WARN */
 361
 362#define ASSERT(expr)    ((void)0)
 363
 364#ifndef STATIC
 365# define STATIC static noinline
 366#endif
 367
 368#endif /* XFS_WARN */
 369#endif /* DEBUG */
 370
 371#ifdef CONFIG_XFS_RT
 372#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
 373#else
 374#define XFS_IS_REALTIME_INODE(ip) (0)
 375#endif
 376
 377#endif /* __XFS_LINUX__ */
 378