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 */ 26 typedef signed char __int8_t; 27 typedef unsigned char __uint8_t; 28 typedef signed short int __int16_t; 29 typedef unsigned short int __uint16_t; 30 typedef signed int __int32_t; 31 typedef unsigned int __uint32_t; 32 typedef signed long long int __int64_t; 33 typedef unsigned long long int __uint64_t; 34 35 typedef __uint32_t inst_t; /* an instruction */ 36 37 typedef __s64 xfs_off_t; /* <file offset> type */ 38 typedef unsigned long long xfs_ino_t; /* <inode> type */ 39 typedef __s64 xfs_daddr_t; /* <disk address> type */ 40 typedef char * xfs_caddr_t; /* <core address> type */ 41 typedef __u32 xfs_dev_t; 42 typedef __u32 xfs_nlink_t; 43 44 /* __psint_t is the same size as a pointer */ 45 #if (BITS_PER_LONG == 32) 46 typedef __int32_t __psint_t; 47 typedef __uint32_t __psunsigned_t; 48 #elif (BITS_PER_LONG == 64) 49 typedef __int64_t __psint_t; 50 typedef __uint64_t __psunsigned_t; 51 #else 52 #error BITS_PER_LONG must be 32 or 64 53 #endif 54 55 #include "xfs_types.h" 56 57 #include "kmem.h" 58 #include "mrlock.h" 59 #include "uuid.h" 60 61 #include <linux/semaphore.h> 62 #include <linux/mm.h> 63 #include <linux/kernel.h> 64 #include <linux/blkdev.h> 65 #include <linux/slab.h> 66 #include <linux/crc32c.h> 67 #include <linux/module.h> 68 #include <linux/mutex.h> 69 #include <linux/file.h> 70 #include <linux/swap.h> 71 #include <linux/errno.h> 72 #include <linux/sched.h> 73 #include <linux/bitops.h> 74 #include <linux/major.h> 75 #include <linux/pagemap.h> 76 #include <linux/vfs.h> 77 #include <linux/seq_file.h> 78 #include <linux/init.h> 79 #include <linux/list.h> 80 #include <linux/proc_fs.h> 81 #include <linux/sort.h> 82 #include <linux/cpu.h> 83 #include <linux/notifier.h> 84 #include <linux/delay.h> 85 #include <linux/log2.h> 86 #include <linux/spinlock.h> 87 #include <linux/random.h> 88 #include <linux/ctype.h> 89 #include <linux/writeback.h> 90 #include <linux/capability.h> 91 #include <linux/kthread.h> 92 #include <linux/freezer.h> 93 #include <linux/list_sort.h> 94 #include <linux/ratelimit.h> 95 96 #include <asm/page.h> 97 #include <asm/div64.h> 98 #include <asm/param.h> 99 #include <asm/uaccess.h> 100 #include <asm/byteorder.h> 101 #include <asm/unaligned.h> 102 103 #include "xfs_fs.h" 104 #include "xfs_stats.h" 105 #include "xfs_sysctl.h" 106 #include "xfs_iops.h" 107 #include "xfs_aops.h" 108 #include "xfs_super.h" 109 #include "xfs_cksum.h" 110 #include "xfs_buf.h" 111 #include "xfs_message.h" 112 113 #ifdef __BIG_ENDIAN 114 #define XFS_NATIVE_HOST 1 115 #else 116 #undef XFS_NATIVE_HOST 117 #endif 118 119 /* 120 * Feature macros (disable/enable) 121 */ 122 #ifdef CONFIG_SMP 123 #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ 124 #else 125 #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */ 126 #endif 127 128 #define irix_sgid_inherit xfs_params.sgid_inherit.val 129 #define irix_symlink_mode xfs_params.symlink_mode.val 130 #define xfs_panic_mask xfs_params.panic_mask.val 131 #define xfs_error_level xfs_params.error_level.val 132 #define xfs_syncd_centisecs xfs_params.syncd_timer.val 133 #define xfs_stats_clear xfs_params.stats_clear.val 134 #define xfs_inherit_sync xfs_params.inherit_sync.val 135 #define xfs_inherit_nodump xfs_params.inherit_nodump.val 136 #define xfs_inherit_noatime xfs_params.inherit_noatim.val 137 #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val 138 #define xfs_rotorstep xfs_params.rotorstep.val 139 #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val 140 #define xfs_fstrm_centisecs xfs_params.fstrm_timer.val 141 #define xfs_eofb_secs xfs_params.eofb_timer.val 142 143 #define current_cpu() (raw_smp_processor_id()) 144 #define current_pid() (current->pid) 145 #define current_test_flags(f) (current->flags & (f)) 146 #define current_set_flags_nested(sp, f) \ 147 (*(sp) = current->flags, current->flags |= (f)) 148 #define current_clear_flags_nested(sp, f) \ 149 (*(sp) = current->flags, current->flags &= ~(f)) 150 #define current_restore_flags_nested(sp, f) \ 151 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f)))) 152 153 #define spinlock_destroy(lock) 154 155 #define NBBY 8 /* number of bits per byte */ 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 PAGE_CACHE_SHIFT 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 #define ENOATTR ENODATA /* Attribute not found */ 167 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ 168 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */ 169 #define EFSBADCRC EBADMSG /* Bad CRC detected */ 170 171 #define SYNCHRONIZE() barrier() 172 #define __return_address __builtin_return_address(0) 173 174 #define XFS_PROJID_DEFAULT 0 175 #define MAXPATHLEN 1024 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)) 180 181 static inline void delay(long ticks) 182 { 183 schedule_timeout_uninterruptible(ticks); 184 } 185 186 /* 187 * XFS wrapper structure for sysfs support. It depends on external data 188 * structures and is embedded in various internal data structures to implement 189 * the XFS sysfs object heirarchy. Define it here for broad access throughout 190 * the codebase. 191 */ 192 struct xfs_kobj { 193 struct kobject kobject; 194 struct completion complete; 195 }; 196 197 /* Kernel uid/gid conversion. These are used to convert to/from the on disk 198 * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally. 199 * The conversion here is type only, the value will remain the same since we 200 * are converting to the init_user_ns. The uid is later mapped to a particular 201 * user namespace value when crossing the kernel/user boundary. 202 */ 203 static inline __uint32_t xfs_kuid_to_uid(kuid_t uid) 204 { 205 return from_kuid(&init_user_ns, uid); 206 } 207 208 static inline kuid_t xfs_uid_to_kuid(__uint32_t uid) 209 { 210 return make_kuid(&init_user_ns, uid); 211 } 212 213 static inline __uint32_t xfs_kgid_to_gid(kgid_t gid) 214 { 215 return from_kgid(&init_user_ns, gid); 216 } 217 218 static inline kgid_t xfs_gid_to_kgid(__uint32_t gid) 219 { 220 return make_kgid(&init_user_ns, gid); 221 } 222 223 /* 224 * Various platform dependent calls that don't fit anywhere else 225 */ 226 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL) 227 #define xfs_stack_trace() dump_stack() 228 229 230 /* Move the kernel do_div definition off to one side */ 231 232 #if defined __i386__ 233 /* For ia32 we need to pull some tricks to get past various versions 234 * of the compiler which do not like us using do_div in the middle 235 * of large functions. 236 */ 237 static inline __u32 xfs_do_div(void *a, __u32 b, int n) 238 { 239 __u32 mod; 240 241 switch (n) { 242 case 4: 243 mod = *(__u32 *)a % b; 244 *(__u32 *)a = *(__u32 *)a / b; 245 return mod; 246 case 8: 247 { 248 unsigned long __upper, __low, __high, __mod; 249 __u64 c = *(__u64 *)a; 250 __upper = __high = c >> 32; 251 __low = c; 252 if (__high) { 253 __upper = __high % (b); 254 __high = __high / (b); 255 } 256 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); 257 asm("":"=A" (c):"a" (__low),"d" (__high)); 258 *(__u64 *)a = c; 259 return __mod; 260 } 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 unsigned long __upper, __low, __high, __mod; 276 __u64 c = *(__u64 *)a; 277 __upper = __high = c >> 32; 278 __low = c; 279 if (__high) { 280 __upper = __high % (b); 281 __high = __high / (b); 282 } 283 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); 284 asm("":"=A" (c):"a" (__low),"d" (__high)); 285 return __mod; 286 } 287 } 288 289 /* NOTREACHED */ 290 return 0; 291 } 292 #else 293 static inline __u32 xfs_do_div(void *a, __u32 b, int n) 294 { 295 __u32 mod; 296 297 switch (n) { 298 case 4: 299 mod = *(__u32 *)a % b; 300 *(__u32 *)a = *(__u32 *)a / b; 301 return mod; 302 case 8: 303 mod = do_div(*(__u64 *)a, b); 304 return mod; 305 } 306 307 /* NOTREACHED */ 308 return 0; 309 } 310 311 /* Side effect free 64 bit mod operation */ 312 static inline __u32 xfs_do_mod(void *a, __u32 b, int n) 313 { 314 switch (n) { 315 case 4: 316 return *(__u32 *)a % b; 317 case 8: 318 { 319 __u64 c = *(__u64 *)a; 320 return do_div(c, b); 321 } 322 } 323 324 /* NOTREACHED */ 325 return 0; 326 } 327 #endif 328 329 #undef do_div 330 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a)) 331 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) 332 333 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y) 334 { 335 x += y - 1; 336 do_div(x, y); 337 return x * y; 338 } 339 340 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y) 341 { 342 x += y - 1; 343 do_div(x, y); 344 return x; 345 } 346 347 /* ARM old ABI has some weird alignment/padding */ 348 #if defined(__arm__) && !defined(__ARM_EABI__) 349 #define __arch_pack __attribute__((packed)) 350 #else 351 #define __arch_pack 352 #endif 353 354 #define ASSERT_ALWAYS(expr) \ 355 (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 356 357 #ifdef DEBUG 358 #define ASSERT(expr) \ 359 (unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 360 361 #ifndef STATIC 362 # define STATIC noinline 363 #endif 364 365 #else /* !DEBUG */ 366 367 #ifdef XFS_WARN 368 369 #define ASSERT(expr) \ 370 (unlikely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__)) 371 372 #ifndef STATIC 373 # define STATIC static noinline 374 #endif 375 376 #else /* !DEBUG && !XFS_WARN */ 377 378 #define ASSERT(expr) ((void)0) 379 380 #ifndef STATIC 381 # define STATIC static noinline 382 #endif 383 384 #endif /* XFS_WARN */ 385 #endif /* DEBUG */ 386 387 #ifdef CONFIG_XFS_RT 388 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) 389 #else 390 #define XFS_IS_REALTIME_INODE(ip) (0) 391 #endif 392 393 #endif /* __XFS_LINUX__ */ 394