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Source at commit ec7cab4cbb721bff91ec924ec691efd8daf36579 created 12 years 8 months ago. By Maarten ter Huurne, MIPS: JZ4740: A320: Updated quickstart documentation. | |
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1 | /* |
2 | * linux/fs/stat.c |
3 | * |
4 | * Copyright (C) 1991, 1992 Linus Torvalds |
5 | */ |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> |
9 | #include <linux/errno.h> |
10 | #include <linux/file.h> |
11 | #include <linux/highuid.h> |
12 | #include <linux/fs.h> |
13 | #include <linux/namei.h> |
14 | #include <linux/security.h> |
15 | #include <linux/syscalls.h> |
16 | #include <linux/pagemap.h> |
17 | |
18 | #include <asm/uaccess.h> |
19 | #include <asm/unistd.h> |
20 | |
21 | void generic_fillattr(struct inode *inode, struct kstat *stat) |
22 | { |
23 | stat->dev = inode->i_sb->s_dev; |
24 | stat->ino = inode->i_ino; |
25 | stat->mode = inode->i_mode; |
26 | stat->nlink = inode->i_nlink; |
27 | stat->uid = inode->i_uid; |
28 | stat->gid = inode->i_gid; |
29 | stat->rdev = inode->i_rdev; |
30 | stat->atime = inode->i_atime; |
31 | stat->mtime = inode->i_mtime; |
32 | stat->ctime = inode->i_ctime; |
33 | stat->size = i_size_read(inode); |
34 | stat->blocks = inode->i_blocks; |
35 | stat->blksize = (1 << inode->i_blkbits); |
36 | } |
37 | |
38 | EXPORT_SYMBOL(generic_fillattr); |
39 | |
40 | int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
41 | { |
42 | struct inode *inode = dentry->d_inode; |
43 | int retval; |
44 | |
45 | retval = security_inode_getattr(mnt, dentry); |
46 | if (retval) |
47 | return retval; |
48 | |
49 | if (inode->i_op->getattr) |
50 | return inode->i_op->getattr(mnt, dentry, stat); |
51 | |
52 | generic_fillattr(inode, stat); |
53 | return 0; |
54 | } |
55 | |
56 | EXPORT_SYMBOL(vfs_getattr); |
57 | |
58 | int vfs_fstat(unsigned int fd, struct kstat *stat) |
59 | { |
60 | struct file *f = fget(fd); |
61 | int error = -EBADF; |
62 | |
63 | if (f) { |
64 | error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat); |
65 | fput(f); |
66 | } |
67 | return error; |
68 | } |
69 | EXPORT_SYMBOL(vfs_fstat); |
70 | |
71 | int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat, |
72 | int flag) |
73 | { |
74 | struct path path; |
75 | int error = -EINVAL; |
76 | int lookup_flags = 0; |
77 | |
78 | if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | |
79 | AT_EMPTY_PATH)) != 0) |
80 | goto out; |
81 | |
82 | if (!(flag & AT_SYMLINK_NOFOLLOW)) |
83 | lookup_flags |= LOOKUP_FOLLOW; |
84 | if (flag & AT_NO_AUTOMOUNT) |
85 | lookup_flags |= LOOKUP_NO_AUTOMOUNT; |
86 | if (flag & AT_EMPTY_PATH) |
87 | lookup_flags |= LOOKUP_EMPTY; |
88 | |
89 | error = user_path_at(dfd, filename, lookup_flags, &path); |
90 | if (error) |
91 | goto out; |
92 | |
93 | error = vfs_getattr(path.mnt, path.dentry, stat); |
94 | path_put(&path); |
95 | out: |
96 | return error; |
97 | } |
98 | EXPORT_SYMBOL(vfs_fstatat); |
99 | |
100 | int vfs_stat(const char __user *name, struct kstat *stat) |
101 | { |
102 | return vfs_fstatat(AT_FDCWD, name, stat, 0); |
103 | } |
104 | EXPORT_SYMBOL(vfs_stat); |
105 | |
106 | int vfs_lstat(const char __user *name, struct kstat *stat) |
107 | { |
108 | return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW); |
109 | } |
110 | EXPORT_SYMBOL(vfs_lstat); |
111 | |
112 | |
113 | #ifdef __ARCH_WANT_OLD_STAT |
114 | |
115 | /* |
116 | * For backward compatibility? Maybe this should be moved |
117 | * into arch/i386 instead? |
118 | */ |
119 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) |
120 | { |
121 | static int warncount = 5; |
122 | struct __old_kernel_stat tmp; |
123 | |
124 | if (warncount > 0) { |
125 | warncount--; |
126 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", |
127 | current->comm); |
128 | } else if (warncount < 0) { |
129 | /* it's laughable, but... */ |
130 | warncount = 0; |
131 | } |
132 | |
133 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); |
134 | tmp.st_dev = old_encode_dev(stat->dev); |
135 | tmp.st_ino = stat->ino; |
136 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
137 | return -EOVERFLOW; |
138 | tmp.st_mode = stat->mode; |
139 | tmp.st_nlink = stat->nlink; |
140 | if (tmp.st_nlink != stat->nlink) |
141 | return -EOVERFLOW; |
142 | SET_UID(tmp.st_uid, stat->uid); |
143 | SET_GID(tmp.st_gid, stat->gid); |
144 | tmp.st_rdev = old_encode_dev(stat->rdev); |
145 | #if BITS_PER_LONG == 32 |
146 | if (stat->size > MAX_NON_LFS) |
147 | return -EOVERFLOW; |
148 | #endif |
149 | tmp.st_size = stat->size; |
150 | tmp.st_atime = stat->atime.tv_sec; |
151 | tmp.st_mtime = stat->mtime.tv_sec; |
152 | tmp.st_ctime = stat->ctime.tv_sec; |
153 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; |
154 | } |
155 | |
156 | SYSCALL_DEFINE2(stat, const char __user *, filename, |
157 | struct __old_kernel_stat __user *, statbuf) |
158 | { |
159 | struct kstat stat; |
160 | int error; |
161 | |
162 | error = vfs_stat(filename, &stat); |
163 | if (error) |
164 | return error; |
165 | |
166 | return cp_old_stat(&stat, statbuf); |
167 | } |
168 | |
169 | SYSCALL_DEFINE2(lstat, const char __user *, filename, |
170 | struct __old_kernel_stat __user *, statbuf) |
171 | { |
172 | struct kstat stat; |
173 | int error; |
174 | |
175 | error = vfs_lstat(filename, &stat); |
176 | if (error) |
177 | return error; |
178 | |
179 | return cp_old_stat(&stat, statbuf); |
180 | } |
181 | |
182 | SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf) |
183 | { |
184 | struct kstat stat; |
185 | int error = vfs_fstat(fd, &stat); |
186 | |
187 | if (!error) |
188 | error = cp_old_stat(&stat, statbuf); |
189 | |
190 | return error; |
191 | } |
192 | |
193 | #endif /* __ARCH_WANT_OLD_STAT */ |
194 | |
195 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) |
196 | { |
197 | struct stat tmp; |
198 | |
199 | #if BITS_PER_LONG == 32 |
200 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) |
201 | return -EOVERFLOW; |
202 | #else |
203 | if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) |
204 | return -EOVERFLOW; |
205 | #endif |
206 | |
207 | memset(&tmp, 0, sizeof(tmp)); |
208 | #if BITS_PER_LONG == 32 |
209 | tmp.st_dev = old_encode_dev(stat->dev); |
210 | #else |
211 | tmp.st_dev = new_encode_dev(stat->dev); |
212 | #endif |
213 | tmp.st_ino = stat->ino; |
214 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
215 | return -EOVERFLOW; |
216 | tmp.st_mode = stat->mode; |
217 | tmp.st_nlink = stat->nlink; |
218 | if (tmp.st_nlink != stat->nlink) |
219 | return -EOVERFLOW; |
220 | SET_UID(tmp.st_uid, stat->uid); |
221 | SET_GID(tmp.st_gid, stat->gid); |
222 | #if BITS_PER_LONG == 32 |
223 | tmp.st_rdev = old_encode_dev(stat->rdev); |
224 | #else |
225 | tmp.st_rdev = new_encode_dev(stat->rdev); |
226 | #endif |
227 | #if BITS_PER_LONG == 32 |
228 | if (stat->size > MAX_NON_LFS) |
229 | return -EOVERFLOW; |
230 | #endif |
231 | tmp.st_size = stat->size; |
232 | tmp.st_atime = stat->atime.tv_sec; |
233 | tmp.st_mtime = stat->mtime.tv_sec; |
234 | tmp.st_ctime = stat->ctime.tv_sec; |
235 | #ifdef STAT_HAVE_NSEC |
236 | tmp.st_atime_nsec = stat->atime.tv_nsec; |
237 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; |
238 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; |
239 | #endif |
240 | tmp.st_blocks = stat->blocks; |
241 | tmp.st_blksize = stat->blksize; |
242 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; |
243 | } |
244 | |
245 | SYSCALL_DEFINE2(newstat, const char __user *, filename, |
246 | struct stat __user *, statbuf) |
247 | { |
248 | struct kstat stat; |
249 | int error = vfs_stat(filename, &stat); |
250 | |
251 | if (error) |
252 | return error; |
253 | return cp_new_stat(&stat, statbuf); |
254 | } |
255 | |
256 | SYSCALL_DEFINE2(newlstat, const char __user *, filename, |
257 | struct stat __user *, statbuf) |
258 | { |
259 | struct kstat stat; |
260 | int error; |
261 | |
262 | error = vfs_lstat(filename, &stat); |
263 | if (error) |
264 | return error; |
265 | |
266 | return cp_new_stat(&stat, statbuf); |
267 | } |
268 | |
269 | #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT) |
270 | SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename, |
271 | struct stat __user *, statbuf, int, flag) |
272 | { |
273 | struct kstat stat; |
274 | int error; |
275 | |
276 | error = vfs_fstatat(dfd, filename, &stat, flag); |
277 | if (error) |
278 | return error; |
279 | return cp_new_stat(&stat, statbuf); |
280 | } |
281 | #endif |
282 | |
283 | SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf) |
284 | { |
285 | struct kstat stat; |
286 | int error = vfs_fstat(fd, &stat); |
287 | |
288 | if (!error) |
289 | error = cp_new_stat(&stat, statbuf); |
290 | |
291 | return error; |
292 | } |
293 | |
294 | SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname, |
295 | char __user *, buf, int, bufsiz) |
296 | { |
297 | struct path path; |
298 | int error; |
299 | |
300 | if (bufsiz <= 0) |
301 | return -EINVAL; |
302 | |
303 | error = user_path_at(dfd, pathname, LOOKUP_EMPTY, &path); |
304 | if (!error) { |
305 | struct inode *inode = path.dentry->d_inode; |
306 | |
307 | error = -EINVAL; |
308 | if (inode->i_op->readlink) { |
309 | error = security_inode_readlink(path.dentry); |
310 | if (!error) { |
311 | touch_atime(path.mnt, path.dentry); |
312 | error = inode->i_op->readlink(path.dentry, |
313 | buf, bufsiz); |
314 | } |
315 | } |
316 | path_put(&path); |
317 | } |
318 | return error; |
319 | } |
320 | |
321 | SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, |
322 | int, bufsiz) |
323 | { |
324 | return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); |
325 | } |
326 | |
327 | |
328 | /* ---------- LFS-64 ----------- */ |
329 | #ifdef __ARCH_WANT_STAT64 |
330 | |
331 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) |
332 | { |
333 | struct stat64 tmp; |
334 | |
335 | memset(&tmp, 0, sizeof(struct stat64)); |
336 | #ifdef CONFIG_MIPS |
337 | /* mips has weird padding, so we don't get 64 bits there */ |
338 | if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) |
339 | return -EOVERFLOW; |
340 | tmp.st_dev = new_encode_dev(stat->dev); |
341 | tmp.st_rdev = new_encode_dev(stat->rdev); |
342 | #else |
343 | tmp.st_dev = huge_encode_dev(stat->dev); |
344 | tmp.st_rdev = huge_encode_dev(stat->rdev); |
345 | #endif |
346 | tmp.st_ino = stat->ino; |
347 | if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino) |
348 | return -EOVERFLOW; |
349 | #ifdef STAT64_HAS_BROKEN_ST_INO |
350 | tmp.__st_ino = stat->ino; |
351 | #endif |
352 | tmp.st_mode = stat->mode; |
353 | tmp.st_nlink = stat->nlink; |
354 | tmp.st_uid = stat->uid; |
355 | tmp.st_gid = stat->gid; |
356 | tmp.st_atime = stat->atime.tv_sec; |
357 | tmp.st_atime_nsec = stat->atime.tv_nsec; |
358 | tmp.st_mtime = stat->mtime.tv_sec; |
359 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; |
360 | tmp.st_ctime = stat->ctime.tv_sec; |
361 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; |
362 | tmp.st_size = stat->size; |
363 | tmp.st_blocks = stat->blocks; |
364 | tmp.st_blksize = stat->blksize; |
365 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; |
366 | } |
367 | |
368 | SYSCALL_DEFINE2(stat64, const char __user *, filename, |
369 | struct stat64 __user *, statbuf) |
370 | { |
371 | struct kstat stat; |
372 | int error = vfs_stat(filename, &stat); |
373 | |
374 | if (!error) |
375 | error = cp_new_stat64(&stat, statbuf); |
376 | |
377 | return error; |
378 | } |
379 | |
380 | SYSCALL_DEFINE2(lstat64, const char __user *, filename, |
381 | struct stat64 __user *, statbuf) |
382 | { |
383 | struct kstat stat; |
384 | int error = vfs_lstat(filename, &stat); |
385 | |
386 | if (!error) |
387 | error = cp_new_stat64(&stat, statbuf); |
388 | |
389 | return error; |
390 | } |
391 | |
392 | SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf) |
393 | { |
394 | struct kstat stat; |
395 | int error = vfs_fstat(fd, &stat); |
396 | |
397 | if (!error) |
398 | error = cp_new_stat64(&stat, statbuf); |
399 | |
400 | return error; |
401 | } |
402 | |
403 | SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename, |
404 | struct stat64 __user *, statbuf, int, flag) |
405 | { |
406 | struct kstat stat; |
407 | int error; |
408 | |
409 | error = vfs_fstatat(dfd, filename, &stat, flag); |
410 | if (error) |
411 | return error; |
412 | return cp_new_stat64(&stat, statbuf); |
413 | } |
414 | #endif /* __ARCH_WANT_STAT64 */ |
415 | |
416 | /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */ |
417 | void __inode_add_bytes(struct inode *inode, loff_t bytes) |
418 | { |
419 | inode->i_blocks += bytes >> 9; |
420 | bytes &= 511; |
421 | inode->i_bytes += bytes; |
422 | if (inode->i_bytes >= 512) { |
423 | inode->i_blocks++; |
424 | inode->i_bytes -= 512; |
425 | } |
426 | } |
427 | |
428 | void inode_add_bytes(struct inode *inode, loff_t bytes) |
429 | { |
430 | spin_lock(&inode->i_lock); |
431 | __inode_add_bytes(inode, bytes); |
432 | spin_unlock(&inode->i_lock); |
433 | } |
434 | |
435 | EXPORT_SYMBOL(inode_add_bytes); |
436 | |
437 | void inode_sub_bytes(struct inode *inode, loff_t bytes) |
438 | { |
439 | spin_lock(&inode->i_lock); |
440 | inode->i_blocks -= bytes >> 9; |
441 | bytes &= 511; |
442 | if (inode->i_bytes < bytes) { |
443 | inode->i_blocks--; |
444 | inode->i_bytes += 512; |
445 | } |
446 | inode->i_bytes -= bytes; |
447 | spin_unlock(&inode->i_lock); |
448 | } |
449 | |
450 | EXPORT_SYMBOL(inode_sub_bytes); |
451 | |
452 | loff_t inode_get_bytes(struct inode *inode) |
453 | { |
454 | loff_t ret; |
455 | |
456 | spin_lock(&inode->i_lock); |
457 | ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; |
458 | spin_unlock(&inode->i_lock); |
459 | return ret; |
460 | } |
461 | |
462 | EXPORT_SYMBOL(inode_get_bytes); |
463 | |
464 | void inode_set_bytes(struct inode *inode, loff_t bytes) |
465 | { |
466 | /* Caller is here responsible for sufficient locking |
467 | * (ie. inode->i_lock) */ |
468 | inode->i_blocks = bytes >> 9; |
469 | inode->i_bytes = bytes & 511; |
470 | } |
471 | |
472 | EXPORT_SYMBOL(inode_set_bytes); |
473 |
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