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
delay(long ticks)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 */
xfs_kuid_to_uid(kuid_t uid)203 static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
204 {
205 return from_kuid(&init_user_ns, uid);
206 }
207
xfs_uid_to_kuid(__uint32_t uid)208 static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
209 {
210 return make_kuid(&init_user_ns, uid);
211 }
212
xfs_kgid_to_gid(kgid_t gid)213 static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
214 {
215 return from_kgid(&init_user_ns, gid);
216 }
217
xfs_gid_to_kgid(__uint32_t gid)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 */
xfs_do_div(void * a,__u32 b,int n)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 */
xfs_do_mod(void * a,__u32 b,int n)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
xfs_do_div(void * a,__u32 b,int n)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 */
xfs_do_mod(void * a,__u32 b,int n)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
roundup_64(__uint64_t x,__uint32_t y)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
howmany_64(__uint64_t x,__uint32_t y)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 #endif /* __XFS_LINUX__ */
388