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 __s64 xfs_off_t; /* <file offset> type */
36 typedef unsigned long long xfs_ino_t; /* <inode> type */
37 typedef __s64 xfs_daddr_t; /* <disk address> type */
38 typedef __u32 xfs_dev_t;
39 typedef __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 #define xfs_cowb_secs xfs_params.cowb_timer.val
120
121 #define current_cpu() (raw_smp_processor_id())
122 #define current_pid() (current->pid)
123 #define current_test_flags(f) (current->flags & (f))
124 #define current_set_flags_nested(sp, f) \
125 (*(sp) = current->flags, current->flags |= (f))
126 #define current_clear_flags_nested(sp, f) \
127 (*(sp) = current->flags, current->flags &= ~(f))
128 #define current_restore_flags_nested(sp, f) \
129 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
130
131 #define spinlock_destroy(lock)
132
133 #define NBBY 8 /* number of bits per byte */
134
135 /*
136 * Size of block device i/o is parameterized here.
137 * Currently the system supports page-sized i/o.
138 */
139 #define BLKDEV_IOSHIFT PAGE_SHIFT
140 #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
141 /* number of BB's per block device block */
142 #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
143
144 #define ENOATTR ENODATA /* Attribute not found */
145 #define EWRONGFS EINVAL /* Mount with wrong filesystem type */
146 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
147 #define EFSBADCRC EBADMSG /* Bad CRC detected */
148
149 #define SYNCHRONIZE() barrier()
150 #define __return_address __builtin_return_address(0)
151
152 #define XFS_PROJID_DEFAULT 0
153 #define MAXPATHLEN 1024
154
155 #define MIN(a,b) (min(a,b))
156 #define MAX(a,b) (max(a,b))
157 #define howmany(x, y) (((x)+((y)-1))/(y))
158
delay(long ticks)159 static inline void delay(long ticks)
160 {
161 schedule_timeout_uninterruptible(ticks);
162 }
163
164 /*
165 * XFS wrapper structure for sysfs support. It depends on external data
166 * structures and is embedded in various internal data structures to implement
167 * the XFS sysfs object heirarchy. Define it here for broad access throughout
168 * the codebase.
169 */
170 struct xfs_kobj {
171 struct kobject kobject;
172 struct completion complete;
173 };
174
175 struct xstats {
176 struct xfsstats __percpu *xs_stats;
177 struct xfs_kobj xs_kobj;
178 };
179
180 extern struct xstats xfsstats;
181
182 /* Kernel uid/gid conversion. These are used to convert to/from the on disk
183 * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses internally.
184 * The conversion here is type only, the value will remain the same since we
185 * are converting to the init_user_ns. The uid is later mapped to a particular
186 * user namespace value when crossing the kernel/user boundary.
187 */
xfs_kuid_to_uid(kuid_t uid)188 static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
189 {
190 return from_kuid(&init_user_ns, uid);
191 }
192
xfs_uid_to_kuid(__uint32_t uid)193 static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
194 {
195 return make_kuid(&init_user_ns, uid);
196 }
197
xfs_kgid_to_gid(kgid_t gid)198 static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
199 {
200 return from_kgid(&init_user_ns, gid);
201 }
202
xfs_gid_to_kgid(__uint32_t gid)203 static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
204 {
205 return make_kgid(&init_user_ns, gid);
206 }
207
208 /*
209 * Various platform dependent calls that don't fit anywhere else
210 */
211 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
212 #define xfs_stack_trace() dump_stack()
213
214
215 /* Move the kernel do_div definition off to one side */
216
217 #if defined __i386__
218 /* For ia32 we need to pull some tricks to get past various versions
219 * of the compiler which do not like us using do_div in the middle
220 * of large functions.
221 */
xfs_do_div(void * a,__u32 b,int n)222 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
223 {
224 __u32 mod;
225
226 switch (n) {
227 case 4:
228 mod = *(__u32 *)a % b;
229 *(__u32 *)a = *(__u32 *)a / b;
230 return mod;
231 case 8:
232 {
233 unsigned long __upper, __low, __high, __mod;
234 __u64 c = *(__u64 *)a;
235 __upper = __high = c >> 32;
236 __low = c;
237 if (__high) {
238 __upper = __high % (b);
239 __high = __high / (b);
240 }
241 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
242 asm("":"=A" (c):"a" (__low),"d" (__high));
243 *(__u64 *)a = c;
244 return __mod;
245 }
246 }
247
248 /* NOTREACHED */
249 return 0;
250 }
251
252 /* Side effect free 64 bit mod operation */
xfs_do_mod(void * a,__u32 b,int n)253 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
254 {
255 switch (n) {
256 case 4:
257 return *(__u32 *)a % b;
258 case 8:
259 {
260 unsigned long __upper, __low, __high, __mod;
261 __u64 c = *(__u64 *)a;
262 __upper = __high = c >> 32;
263 __low = c;
264 if (__high) {
265 __upper = __high % (b);
266 __high = __high / (b);
267 }
268 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
269 asm("":"=A" (c):"a" (__low),"d" (__high));
270 return __mod;
271 }
272 }
273
274 /* NOTREACHED */
275 return 0;
276 }
277 #else
xfs_do_div(void * a,__u32 b,int n)278 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
279 {
280 __u32 mod;
281
282 switch (n) {
283 case 4:
284 mod = *(__u32 *)a % b;
285 *(__u32 *)a = *(__u32 *)a / b;
286 return mod;
287 case 8:
288 mod = do_div(*(__u64 *)a, b);
289 return mod;
290 }
291
292 /* NOTREACHED */
293 return 0;
294 }
295
296 /* Side effect free 64 bit mod operation */
xfs_do_mod(void * a,__u32 b,int n)297 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
298 {
299 switch (n) {
300 case 4:
301 return *(__u32 *)a % b;
302 case 8:
303 {
304 __u64 c = *(__u64 *)a;
305 return do_div(c, b);
306 }
307 }
308
309 /* NOTREACHED */
310 return 0;
311 }
312 #endif
313
314 #undef do_div
315 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
316 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
317
roundup_64(__uint64_t x,__uint32_t y)318 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
319 {
320 x += y - 1;
321 do_div(x, y);
322 return x * y;
323 }
324
howmany_64(__uint64_t x,__uint32_t y)325 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
326 {
327 x += y - 1;
328 do_div(x, y);
329 return x;
330 }
331
332 #define ASSERT_ALWAYS(expr) \
333 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
334
335 #ifdef DEBUG
336 #define ASSERT(expr) \
337 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
338
339 #ifndef STATIC
340 # define STATIC noinline
341 #endif
342
343 #else /* !DEBUG */
344
345 #ifdef XFS_WARN
346
347 #define ASSERT(expr) \
348 (likely(expr) ? (void)0 : asswarn(#expr, __FILE__, __LINE__))
349
350 #ifndef STATIC
351 # define STATIC static noinline
352 #endif
353
354 #else /* !DEBUG && !XFS_WARN */
355
356 #define ASSERT(expr) ((void)0)
357
358 #ifndef STATIC
359 # define STATIC static noinline
360 #endif
361
362 #endif /* XFS_WARN */
363 #endif /* DEBUG */
364
365 #ifdef CONFIG_XFS_RT
366
367 /*
368 * make sure we ignore the inode flag if the filesystem doesn't have a
369 * configured realtime device.
370 */
371 #define XFS_IS_REALTIME_INODE(ip) \
372 (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) && \
373 (ip)->i_mount->m_rtdev_targp)
374 #else
375 #define XFS_IS_REALTIME_INODE(ip) (0)
376 #endif
377
378 #endif /* __XFS_LINUX__ */
379