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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | #ifndef __XFS_LINUX__ | |
33 | #define __XFS_LINUX__ | |
34 | ||
35 | #include <linux/types.h> | |
36 | #include <linux/config.h> | |
37 | ||
38 | /* | |
39 | * Some types are conditional depending on the target system. | |
40 | * XFS_BIG_BLKNOS needs block layer disk addresses to be 64 bits. | |
41 | * XFS_BIG_INUMS needs the VFS inode number to be 64 bits, as well | |
42 | * as requiring XFS_BIG_BLKNOS to be set. | |
43 | */ | |
44 | #if defined(CONFIG_LBD) || (BITS_PER_LONG == 64) | |
45 | # define XFS_BIG_BLKNOS 1 | |
46 | # if BITS_PER_LONG == 64 | |
47 | # define XFS_BIG_INUMS 1 | |
48 | # else | |
49 | # define XFS_BIG_INUMS 0 | |
50 | # endif | |
51 | #else | |
52 | # define XFS_BIG_BLKNOS 0 | |
53 | # define XFS_BIG_INUMS 0 | |
54 | #endif | |
55 | ||
56 | #include <xfs_types.h> | |
57 | #include <xfs_arch.h> | |
58 | ||
59 | #include <kmem.h> | |
60 | #include <mrlock.h> | |
61 | #include <spin.h> | |
62 | #include <sv.h> | |
63 | #include <mutex.h> | |
64 | #include <sema.h> | |
65 | #include <time.h> | |
66 | ||
1da177e4 LT |
67 | #include <support/ktrace.h> |
68 | #include <support/debug.h> | |
69 | #include <support/move.h> | |
70 | #include <support/uuid.h> | |
71 | ||
72 | #include <linux/mm.h> | |
73 | #include <linux/kernel.h> | |
74 | #include <linux/blkdev.h> | |
75 | #include <linux/slab.h> | |
76 | #include <linux/module.h> | |
77 | #include <linux/file.h> | |
78 | #include <linux/swap.h> | |
79 | #include <linux/errno.h> | |
80 | #include <linux/sched.h> | |
81 | #include <linux/bitops.h> | |
82 | #include <linux/major.h> | |
83 | #include <linux/pagemap.h> | |
84 | #include <linux/vfs.h> | |
85 | #include <linux/seq_file.h> | |
86 | #include <linux/init.h> | |
87 | #include <linux/list.h> | |
88 | #include <linux/proc_fs.h> | |
89 | #include <linux/version.h> | |
90 | #include <linux/sort.h> | |
91 | ||
92 | #include <asm/page.h> | |
93 | #include <asm/div64.h> | |
94 | #include <asm/param.h> | |
95 | #include <asm/uaccess.h> | |
96 | #include <asm/byteorder.h> | |
97 | #include <asm/unaligned.h> | |
98 | ||
99 | #include <xfs_behavior.h> | |
100 | #include <xfs_vfs.h> | |
101 | #include <xfs_cred.h> | |
102 | #include <xfs_vnode.h> | |
103 | #include <xfs_stats.h> | |
104 | #include <xfs_sysctl.h> | |
105 | #include <xfs_iops.h> | |
0829c360 | 106 | #include <xfs_aops.h> |
1da177e4 LT |
107 | #include <xfs_super.h> |
108 | #include <xfs_globals.h> | |
109 | #include <xfs_fs_subr.h> | |
110 | #include <xfs_lrw.h> | |
111 | #include <xfs_buf.h> | |
112 | ||
113 | /* | |
114 | * Feature macros (disable/enable) | |
115 | */ | |
116 | #undef HAVE_REFCACHE /* reference cache not needed for NFS in 2.6 */ | |
117 | #define HAVE_SENDFILE /* sendfile(2) exists in 2.6, but not in 2.4 */ | |
118 | ||
119 | /* | |
120 | * State flag for unwritten extent buffers. | |
121 | * | |
122 | * We need to be able to distinguish between these and delayed | |
123 | * allocate buffers within XFS. The generic IO path code does | |
124 | * not need to distinguish - we use the BH_Delay flag for both | |
125 | * delalloc and these ondisk-uninitialised buffers. | |
126 | */ | |
127 | BUFFER_FNS(PrivateStart, unwritten); | |
128 | static inline void set_buffer_unwritten_io(struct buffer_head *bh) | |
129 | { | |
130 | bh->b_end_io = linvfs_unwritten_done; | |
131 | } | |
132 | ||
133 | #define restricted_chown xfs_params.restrict_chown.val | |
134 | #define irix_sgid_inherit xfs_params.sgid_inherit.val | |
135 | #define irix_symlink_mode xfs_params.symlink_mode.val | |
136 | #define xfs_panic_mask xfs_params.panic_mask.val | |
137 | #define xfs_error_level xfs_params.error_level.val | |
138 | #define xfs_syncd_centisecs xfs_params.syncd_timer.val | |
139 | #define xfs_stats_clear xfs_params.stats_clear.val | |
140 | #define xfs_inherit_sync xfs_params.inherit_sync.val | |
141 | #define xfs_inherit_nodump xfs_params.inherit_nodump.val | |
142 | #define xfs_inherit_noatime xfs_params.inherit_noatim.val | |
143 | #define xfs_buf_timer_centisecs xfs_params.xfs_buf_timer.val | |
144 | #define xfs_buf_age_centisecs xfs_params.xfs_buf_age.val | |
145 | #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val | |
146 | #define xfs_rotorstep xfs_params.rotorstep.val | |
147 | ||
39c715b7 IM |
148 | #ifndef raw_smp_processor_id |
149 | #define raw_smp_processor_id() smp_processor_id() | |
1da177e4 | 150 | #endif |
39c715b7 | 151 | #define current_cpu() raw_smp_processor_id() |
1da177e4 LT |
152 | #define current_pid() (current->pid) |
153 | #define current_fsuid(cred) (current->fsuid) | |
154 | #define current_fsgid(cred) (current->fsgid) | |
155 | ||
156 | #define NBPP PAGE_SIZE | |
157 | #define DPPSHFT (PAGE_SHIFT - 9) | |
158 | #define NDPP (1 << (PAGE_SHIFT - 9)) | |
159 | #define dtop(DD) (((DD) + NDPP - 1) >> DPPSHFT) | |
160 | #define dtopt(DD) ((DD) >> DPPSHFT) | |
161 | #define dpoff(DD) ((DD) & (NDPP-1)) | |
162 | ||
163 | #define NBBY 8 /* number of bits per byte */ | |
164 | #define NBPC PAGE_SIZE /* Number of bytes per click */ | |
165 | #define BPCSHIFT PAGE_SHIFT /* LOG2(NBPC) if exact */ | |
166 | ||
167 | /* | |
168 | * Size of block device i/o is parameterized here. | |
169 | * Currently the system supports page-sized i/o. | |
170 | */ | |
171 | #define BLKDEV_IOSHIFT BPCSHIFT | |
172 | #define BLKDEV_IOSIZE (1<<BLKDEV_IOSHIFT) | |
173 | /* number of BB's per block device block */ | |
174 | #define BLKDEV_BB BTOBB(BLKDEV_IOSIZE) | |
175 | ||
176 | /* bytes to clicks */ | |
177 | #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) | |
178 | #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) | |
179 | #define btoc64(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) | |
180 | #define btoct64(x) ((__uint64_t)(x)>>BPCSHIFT) | |
181 | #define io_btoc(x) (((__psunsigned_t)(x)+(IO_NBPC-1))>>IO_BPCSHIFT) | |
182 | #define io_btoct(x) ((__psunsigned_t)(x)>>IO_BPCSHIFT) | |
183 | ||
184 | /* off_t bytes to clicks */ | |
185 | #define offtoc(x) (((__uint64_t)(x)+(NBPC-1))>>BPCSHIFT) | |
186 | #define offtoct(x) ((xfs_off_t)(x)>>BPCSHIFT) | |
187 | ||
188 | /* clicks to off_t bytes */ | |
189 | #define ctooff(x) ((xfs_off_t)(x)<<BPCSHIFT) | |
190 | ||
191 | /* clicks to bytes */ | |
192 | #define ctob(x) ((__psunsigned_t)(x)<<BPCSHIFT) | |
193 | #define btoct(x) ((__psunsigned_t)(x)>>BPCSHIFT) | |
194 | #define ctob64(x) ((__uint64_t)(x)<<BPCSHIFT) | |
195 | #define io_ctob(x) ((__psunsigned_t)(x)<<IO_BPCSHIFT) | |
196 | ||
197 | /* bytes to clicks */ | |
198 | #define btoc(x) (((__psunsigned_t)(x)+(NBPC-1))>>BPCSHIFT) | |
199 | ||
200 | #ifndef CELL_CAPABLE | |
201 | #define FSC_NOTIFY_NAME_CHANGED(vp) | |
202 | #endif | |
203 | ||
204 | #ifndef ENOATTR | |
205 | #define ENOATTR ENODATA /* Attribute not found */ | |
206 | #endif | |
207 | ||
208 | /* Note: EWRONGFS never visible outside the kernel */ | |
209 | #define EWRONGFS EINVAL /* Mount with wrong filesystem type */ | |
210 | ||
211 | /* | |
212 | * XXX EFSCORRUPTED needs a real value in errno.h. asm-i386/errno.h won't | |
213 | * return codes out of its known range in errno. | |
214 | * XXX Also note: needs to be < 1000 and fairly unique on Linux (mustn't | |
215 | * conflict with any code we use already or any code a driver may use) | |
216 | * XXX Some options (currently we do #2): | |
217 | * 1/ New error code ["Filesystem is corrupted", _after_ glibc updated] | |
218 | * 2/ 990 ["Unknown error 990"] | |
219 | * 3/ EUCLEAN ["Structure needs cleaning"] | |
220 | * 4/ Convert EFSCORRUPTED to EIO [just prior to return into userspace] | |
221 | */ | |
222 | #define EFSCORRUPTED 990 /* Filesystem is corrupted */ | |
223 | ||
224 | #define SYNCHRONIZE() barrier() | |
225 | #define __return_address __builtin_return_address(0) | |
226 | ||
227 | /* | |
228 | * IRIX (BSD) quotactl makes use of separate commands for user/group, | |
229 | * whereas on Linux the syscall encodes this information into the cmd | |
230 | * field (see the QCMD macro in quota.h). These macros help keep the | |
231 | * code portable - they are not visible from the syscall interface. | |
232 | */ | |
c8ad20ff NS |
233 | #define Q_XSETGQLIM XQM_CMD(8) /* set groups disk limits */ |
234 | #define Q_XGETGQUOTA XQM_CMD(9) /* get groups disk limits */ | |
235 | #define Q_XSETPQLIM XQM_CMD(10) /* set projects disk limits */ | |
236 | #define Q_XGETPQUOTA XQM_CMD(11) /* get projects disk limits */ | |
1da177e4 LT |
237 | |
238 | /* IRIX uses a dynamic sizing algorithm (ndquot = 200 + numprocs*2) */ | |
239 | /* we may well need to fine-tune this if it ever becomes an issue. */ | |
240 | #define DQUOT_MAX_HEURISTIC 1024 /* NR_DQUOTS */ | |
241 | #define ndquot DQUOT_MAX_HEURISTIC | |
242 | ||
243 | /* IRIX uses the current size of the name cache to guess a good value */ | |
244 | /* - this isn't the same but is a good enough starting point for now. */ | |
245 | #define DQUOT_HASH_HEURISTIC files_stat.nr_files | |
246 | ||
247 | /* IRIX inodes maintain the project ID also, zero this field on Linux */ | |
248 | #define DEFAULT_PROJID 0 | |
249 | #define dfltprid DEFAULT_PROJID | |
250 | ||
251 | #define MAXPATHLEN 1024 | |
252 | ||
253 | #define MIN(a,b) (min(a,b)) | |
254 | #define MAX(a,b) (max(a,b)) | |
255 | #define howmany(x, y) (((x)+((y)-1))/(y)) | |
256 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) | |
cde410a9 | 257 | #define qsort(a,n,s,fn) sort(a,n,s,fn,NULL) |
1da177e4 | 258 | |
cde410a9 NS |
259 | /* |
260 | * Various platform dependent calls that don't fit anywhere else | |
261 | */ | |
1da177e4 | 262 | #define xfs_stack_trace() dump_stack() |
1da177e4 LT |
263 | #define xfs_itruncate_data(ip, off) \ |
264 | (-vmtruncate(LINVFS_GET_IP(XFS_ITOV(ip)), (off))) | |
cde410a9 NS |
265 | #define xfs_statvfs_fsid(statp, mp) \ |
266 | ({ u64 id = huge_encode_dev((mp)->m_dev); \ | |
267 | __kernel_fsid_t *fsid = &(statp)->f_fsid; \ | |
268 | (fsid->val[0] = (u32)id, fsid->val[1] = (u32)(id >> 32)); }) | |
1da177e4 LT |
269 | |
270 | ||
271 | /* Move the kernel do_div definition off to one side */ | |
272 | ||
273 | #if defined __i386__ | |
274 | /* For ia32 we need to pull some tricks to get past various versions | |
275 | * of the compiler which do not like us using do_div in the middle | |
276 | * of large functions. | |
277 | */ | |
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 | { | |
289 | unsigned long __upper, __low, __high, __mod; | |
290 | __u64 c = *(__u64 *)a; | |
291 | __upper = __high = c >> 32; | |
292 | __low = c; | |
293 | if (__high) { | |
294 | __upper = __high % (b); | |
295 | __high = __high / (b); | |
296 | } | |
297 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); | |
298 | asm("":"=A" (c):"a" (__low),"d" (__high)); | |
299 | *(__u64 *)a = c; | |
300 | return __mod; | |
301 | } | |
302 | } | |
303 | ||
304 | /* NOTREACHED */ | |
305 | return 0; | |
306 | } | |
307 | ||
308 | /* Side effect free 64 bit mod operation */ | |
309 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) | |
310 | { | |
311 | switch (n) { | |
312 | case 4: | |
313 | return *(__u32 *)a % b; | |
314 | case 8: | |
315 | { | |
316 | unsigned long __upper, __low, __high, __mod; | |
317 | __u64 c = *(__u64 *)a; | |
318 | __upper = __high = c >> 32; | |
319 | __low = c; | |
320 | if (__high) { | |
321 | __upper = __high % (b); | |
322 | __high = __high / (b); | |
323 | } | |
324 | asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (b), "0" (__low), "1" (__upper)); | |
325 | asm("":"=A" (c):"a" (__low),"d" (__high)); | |
326 | return __mod; | |
327 | } | |
328 | } | |
329 | ||
330 | /* NOTREACHED */ | |
331 | return 0; | |
332 | } | |
333 | #else | |
334 | static inline __u32 xfs_do_div(void *a, __u32 b, int n) | |
335 | { | |
336 | __u32 mod; | |
337 | ||
338 | switch (n) { | |
339 | case 4: | |
340 | mod = *(__u32 *)a % b; | |
341 | *(__u32 *)a = *(__u32 *)a / b; | |
342 | return mod; | |
343 | case 8: | |
344 | mod = do_div(*(__u64 *)a, b); | |
345 | return mod; | |
346 | } | |
347 | ||
348 | /* NOTREACHED */ | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /* Side effect free 64 bit mod operation */ | |
353 | static inline __u32 xfs_do_mod(void *a, __u32 b, int n) | |
354 | { | |
355 | switch (n) { | |
356 | case 4: | |
357 | return *(__u32 *)a % b; | |
358 | case 8: | |
359 | { | |
360 | __u64 c = *(__u64 *)a; | |
361 | return do_div(c, b); | |
362 | } | |
363 | } | |
364 | ||
365 | /* NOTREACHED */ | |
366 | return 0; | |
367 | } | |
368 | #endif | |
369 | ||
370 | #undef do_div | |
371 | #define do_div(a, b) xfs_do_div(&(a), (b), sizeof(a)) | |
372 | #define do_mod(a, b) xfs_do_mod(&(a), (b), sizeof(a)) | |
373 | ||
374 | static inline __uint64_t roundup_64(__uint64_t x, __uint32_t y) | |
375 | { | |
376 | x += y - 1; | |
377 | do_div(x, y); | |
378 | return(x * y); | |
379 | } | |
380 | ||
1da177e4 | 381 | #endif /* __XFS_LINUX__ */ |