tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * Some types are conditional depending on the target system.
25 * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits.
26 * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well
27 * as requiring XFS_BIG_BLKNOS to be set.
28 */
29#if defined(CONFIG_LBD) || (BITS_PER_LONG == 64)
30# define XFS_BIG_BLKNOS 1
31# if BITS_PER_LONG == 64
32# define XFS_BIG_INUMS 1
33# else
34# define XFS_BIG_INUMS 0
35# endif
36#else
37# define XFS_BIG_BLKNOS 0
38# define XFS_BIG_INUMS 0
39#endif
40
41#include <xfs_types.h>
42#include <xfs_arch.h>
43
44#include <kmem.h>
45#include <mrlock.h>
46#include <spin.h>
47#include <sv.h>
48#include <mutex.h>
49#include <sema.h>
50#include <time.h>
51
52#include <support/ktrace.h>
53#include <support/debug.h>
54#include <support/uuid.h>
55
56#include <linux/mm.h>
57#include <linux/kernel.h>
58#include <linux/blkdev.h>
59#include <linux/slab.h>
60#include <linux/module.h>
61#include <linux/file.h>
62#include <linux/swap.h>
63#include <linux/errno.h>
64#include <linux/sched.h>
65#include <linux/bitops.h>
66#include <linux/major.h>
67#include <linux/pagemap.h>
68#include <linux/vfs.h>
69#include <linux/seq_file.h>
70#include <linux/init.h>
71#include <linux/list.h>
72#include <linux/proc_fs.h>
73#include <linux/sort.h>
74#include <linux/cpu.h>
75#include <linux/notifier.h>
76#include <linux/delay.h>
77#include <linux/log2.h>
78
79#include <asm/page.h>
80#include <asm/div64.h>
81#include <asm/param.h>
82#include <asm/uaccess.h>
83#include <asm/byteorder.h>
84#include <asm/unaligned.h>
85
86#include <xfs_vfs.h>
87#include <xfs_cred.h>
88#include <xfs_vnode.h>
89#include <xfs_stats.h>
90#include <xfs_sysctl.h>
91#include <xfs_iops.h>
92#include <xfs_aops.h>
93#include <xfs_super.h>
94#include <xfs_globals.h>
95#include <xfs_fs_subr.h>
96#include <xfs_lrw.h>
97#include <xfs_buf.h>
98
99/*
100 * Feature macros (disable/enable)
101 */
102#undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */
103#define HAVE_SPLICE /* a splice(2) exists in 2.6, but not in 2.4 */
104#ifdef CONFIG_SMP
105#define HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
106#else
107#undef HAVE_PERCPU_SB /* per cpu superblock counters are a 2.6 feature */
108#endif
109
110#define restricted_chown xfs_params.restrict_chown.val
111#define irix_sgid_inherit xfs_params.sgid_inherit.val
112#define irix_symlink_mode xfs_params.symlink_mode.val
113#define xfs_panic_mask xfs_params.panic_mask.val
114#define xfs_error_level xfs_params.error_level.val
115#define xfs_syncd_centisecs xfs_params.syncd_timer.val
116#define xfs_stats_clear xfs_params.stats_clear.val
117#define xfs_inherit_sync xfs_params.inherit_sync.val
118#define xfs_inherit_nodump xfs_params.inherit_nodump.val
119#define xfs_inherit_noatime xfs_params.inherit_noatim.val
120#define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val
121#define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val
122#define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val
123#define xfs_rotorstep xfs_params.rotorstep.val
124#define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
125#define xfs_fstrm_centisecs xfs_params.fstrm_timer.val
126
127#define current_cpu() (raw_smp_processor_id())
128#define current_pid() (current->pid)
129#define current_fsuid(cred) (current->fsuid)
130#define current_fsgid(cred) (current->fsgid)
131#define current_test_flags(f) (current->flags & (f))
132#define current_set_flags_nested(sp, f) \
133 (*(sp) = current->flags, current->flags |= (f))
134#define current_clear_flags_nested(sp, f) \
135 (*(sp) = current->flags, current->flags &= ~(f))
136#define current_restore_flags_nested(sp, f) \
137 (current->flags = ((current->flags & ~(f)) | (*(sp) & (f))))
138
139#define NBPP PAGE_SIZE
140#define NDPP (1 << (PAGE_SHIFT - 9))
141
142#define NBBY 8 /* number of bits per byte */
143#define NBPC PAGE_SIZE /* Number of bytes per click */
144#define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */
145
146/*
147 * Size of block device i/o is parameterized here.
148 * Currently the system supports page-sized i/o.
149 */
150#define BLKDEV_IOSHIFT BPCSHIFT
151#define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT)
152/* number of BB's per block device block */
153#define BLKDEV_BB BTOBB(BLKDEV_IOSIZE)
154
155/* bytes to clicks */
156#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
157#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
158#define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
159#define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT)
160
161/* off_t bytes to clicks */
162#define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT)
163#define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT)
164
165/* clicks to off_t bytes */
166#define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT)
167
168/* clicks to bytes */
169#define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT)
170#define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT)
171#define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT)
172
173/* bytes to clicks */
174#define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT)
175
176#define ENOATTR ENODATA /* Attribute not found */
177#define EWRONGFS EINVAL /* Mount with wrong filesystem type */
178#define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
179
180#define SYNCHRONIZE() barrier()
181#define __return_address __builtin_return_address(0)
182
183/*
184 * IRIX (BSD) quotactl makes use of separate commands for user/group,
185 * whereas on Linux the syscall encodes this information into the cmd
186 * field (see the QCMD macro in quota.h). These macros help keep the
187 * code portable - they are not visible from the syscall interface.
188 */
189#define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */
190#define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */
191#define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */
192#define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */
193
194#define dfltprid 0
195#define MAXPATHLEN 1024
196
197#define MIN(a,b) (min(a,b))
198#define MAX(a,b) (max(a,b))
199#define howmany(x, y) (((x)+((y)-1))/(y))
200
201/*
202 * Various platform dependent calls that don't fit anywhere else
203 */
204#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
205#define xfs_stack_trace() dump_stack()
206#define xfs_itruncate_data(ip, off) \
207 (-vmtruncate(vn_to_inode(XFS_ITOV(ip)), (off)))
208#define xfs_statvfs_fsid(statp, mp) \
209 ({ u64 id = huge_encode_dev((mp)->m_ddev_targp->bt_dev); \
210 __kernel_fsid_t *fsid = &(statp)->f_fsid; \
211 (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); })
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#endif /* __XFS_LINUX__ */