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 * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
25 * XFS_BIG_INUMS requires XFS_BIG_BLKNOS to be set.
26 */
27 #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
28 # define XFS_BIG_BLKNOS 1
29 # define XFS_BIG_INUMS 1
30 #else
31 # define XFS_BIG_BLKNOS 0
32 # define XFS_BIG_INUMS 0
33 #endif
34
35 #include <xfs_types.h>
36 #include <xfs_arch.h>
37
38 #include <kmem.h>
39 #include <mrlock.h>
40 #include <sv.h>
41 #include <mutex.h>
42 #include <time.h>
43
44 #include <support/ktrace.h>
45 #include <support/debug.h>
46 #include <support/uuid.h>
47
48 #include <linux/semaphore.h>
49 #include <linux/mm.h>
50 #include <linux/kernel.h>
51 #include <linux/blkdev.h>
52 #include <linux/slab.h>
53 #include <linux/module.h>
54 #include <linux/file.h>
55 #include <linux/swap.h>
56 #include <linux/errno.h>
57 #include <linux/sched.h>
58 #include <linux/bitops.h>
59 #include <linux/major.h>
60 #include <linux/pagemap.h>
61 #include <linux/vfs.h>
62 #include <linux/seq_file.h>
63 #include <linux/init.h>
64 #include <linux/list.h>
65 #include <linux/proc_fs.h>
66 #include <linux/sort.h>
67 #include <linux/cpu.h>
68 #include <linux/notifier.h>
69 #include <linux/delay.h>
70 #include <linux/log2.h>
71 #include <linux/spinlock.h>
72 #include <linux/random.h>
73 #include <linux/ctype.h>
74 #include <linux/writeback.h>
75
76 #include <asm/page.h>
77 #include <asm/div64.h>
78 #include <asm/param.h>
79 #include <asm/uaccess.h>
80 #include <asm/byteorder.h>
81 #include <asm/unaligned.h>
82
83 #include <xfs_cred.h>
84 #include <xfs_vnode.h>
85 #include <xfs_stats.h>
86 #include <xfs_sysctl.h>
87 #include <xfs_iops.h>
88 #include <xfs_aops.h>
89 #include <xfs_super.h>
90 #include <xfs_globals.h>
91 #include <xfs_fs_subr.h>
92 #include <xfs_lrw.h>
93 #include <xfs_buf.h>
94
95 /*
96 * Feature macros (disable/enable)
97 */
98 #ifdef CONFIG_SMP
99 #define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
100 #else
101 #undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
102 #endif
103
104 #define irix_sgid_inherit xfs_params.sgid_inherit.val
105 #define irix_symlink_mode xfs_params.symlink_mode.val
106 #define xfs_panic_mask xfs_params.panic_mask.val
107 #define xfs_error_level xfs_params.error_level.val
108 #define xfs_syncd_centisecs xfs_params.syncd_timer.val
109 #define xfs_stats_clear xfs_params.stats_clear.val
110 #define xfs_inherit_sync xfs_params.inherit_sync.val
111 #define xfs_inherit_nodump xfs_params.inherit_nodump.val
112 #define xfs_inherit_noatime xfs_params.inherit_noatim.val
113 #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
114 #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
115 #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
116 #define xfs_rotorstep xfs_params.rotorstep.val
117 #define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
118 #define xfs_fstrm_centisecs xfs_params.fstrm_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_CACHE_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
147 #define SYNCHRONIZE() barrier()
148 #define __return_address __builtin_return_address(0)
149
150 /*
151 * IRIX (BSD) quotactl makes use of separate commands for user/group,
152 * whereas on Linux the syscall encodes this information into the cmd
153 * field (see the QCMD macro in quota.h). These macros help keep the
154 * code portable - they are not visible from the syscall interface.
155 */
156 #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
157 #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
158 #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
159 #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
160
161 #define dfltprid 0
162 #define MAXPATHLEN 1024
163
164 #define MIN(a,b) (min(a,b))
165 #define MAX(a,b) (max(a,b))
166 #define howmany(x, y) (((x)+((y)-1))/(y))
167
168 /*
169 * Various platform dependent calls that don't fit anywhere else
170 */
171 #define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
172 #define xfs_stack_trace() dump_stack()
173 #define xfs_itruncate_data(ip, off) \
174 (-vmtruncate(VFS_I(ip), (off)))
175
176
177 /* Move the kernel do_div definition off to one side */
178
179 #if defined __i386__
180 /* For ia32 we need to pull some tricks to get past various versions
181 * of the compiler which do not like us using do_div in the middle
182 * of large functions.
183 */
xfs_do_div(void * a,__u32 b,int n)184 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
185 {
186 __u32 mod;
187
188 switch (n) {
189 case 4:
190 mod = *(__u32 *)a % b;
191 *(__u32 *)a = *(__u32 *)a / b;
192 return mod;
193 case 8:
194 {
195 unsigned long __upper, __low, __high, __mod;
196 __u64 c = *(__u64 *)a;
197 __upper = __high = c >> 32;
198 __low = c;
199 if (__high) {
200 __upper = __high % (b);
201 __high = __high / (b);
202 }
203 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
204 asm("":"=A" (c):"a" (__low),"d" (__high));
205 *(__u64 *)a = c;
206 return __mod;
207 }
208 }
209
210 /* NOTREACHED */
211 return 0;
212 }
213
214 /* Side effect free 64 bit mod operation */
xfs_do_mod(void * a,__u32 b,int n)215 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
216 {
217 switch (n) {
218 case 4:
219 return *(__u32 *)a % b;
220 case 8:
221 {
222 unsigned long __upper, __low, __high, __mod;
223 __u64 c = *(__u64 *)a;
224 __upper = __high = c >> 32;
225 __low = c;
226 if (__high) {
227 __upper = __high % (b);
228 __high = __high / (b);
229 }
230 asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper));
231 asm("":"=A" (c):"a" (__low),"d" (__high));
232 return __mod;
233 }
234 }
235
236 /* NOTREACHED */
237 return 0;
238 }
239 #else
xfs_do_div(void * a,__u32 b,int n)240 static inline __u32 xfs_do_div(void *a, __u32 b, int n)
241 {
242 __u32 mod;
243
244 switch (n) {
245 case 4:
246 mod = *(__u32 *)a % b;
247 *(__u32 *)a = *(__u32 *)a / b;
248 return mod;
249 case 8:
250 mod = do_div(*(__u64 *)a, b);
251 return mod;
252 }
253
254 /* NOTREACHED */
255 return 0;
256 }
257
258 /* Side effect free 64 bit mod operation */
xfs_do_mod(void * a,__u32 b,int n)259 static inline __u32 xfs_do_mod(void *a, __u32 b, int n)
260 {
261 switch (n) {
262 case 4:
263 return *(__u32 *)a % b;
264 case 8:
265 {
266 __u64 c = *(__u64 *)a;
267 return do_div(c, b);
268 }
269 }
270
271 /* NOTREACHED */
272 return 0;
273 }
274 #endif
275
276 #undef do_div
277 #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a))
278 #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a))
279
roundup_64(__uint64_t x,__uint32_t y)280 static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y)
281 {
282 x += y - 1;
283 do_div(x, y);
284 return(x * y);
285 }
286
howmany_64(__uint64_t x,__uint32_t y)287 static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
288 {
289 x += y - 1;
290 do_div(x, y);
291 return x;
292 }
293
294 /* ARM old ABI has some weird alignment/padding */
295 #if defined(__arm__) && !defined(__ARM_EABI__)
296 #define __arch_pack __attribute__((packed))
297 #else
298 #define __arch_pack
299 #endif
300
301 #endif /* __XFS_LINUX__ */
302