diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/stat.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/stat.c')
-rw-r--r-- | fs/stat.c | 410 |
1 files changed, 410 insertions, 0 deletions
diff --git a/fs/stat.c b/fs/stat.c new file mode 100644 index 000000000000..b8a0e5110ab2 --- /dev/null +++ b/fs/stat.c | |||
@@ -0,0 +1,410 @@ | |||
1 | /* | ||
2 | * linux/fs/stat.c | ||
3 | * | ||
4 | * Copyright (C) 1991, 1992 Linus Torvalds | ||
5 | */ | ||
6 | |||
7 | #include <linux/config.h> | ||
8 | #include <linux/module.h> | ||
9 | #include <linux/mm.h> | ||
10 | #include <linux/errno.h> | ||
11 | #include <linux/file.h> | ||
12 | #include <linux/smp_lock.h> | ||
13 | #include <linux/highuid.h> | ||
14 | #include <linux/fs.h> | ||
15 | #include <linux/namei.h> | ||
16 | #include <linux/security.h> | ||
17 | #include <linux/syscalls.h> | ||
18 | |||
19 | #include <asm/uaccess.h> | ||
20 | #include <asm/unistd.h> | ||
21 | |||
22 | void generic_fillattr(struct inode *inode, struct kstat *stat) | ||
23 | { | ||
24 | stat->dev = inode->i_sb->s_dev; | ||
25 | stat->ino = inode->i_ino; | ||
26 | stat->mode = inode->i_mode; | ||
27 | stat->nlink = inode->i_nlink; | ||
28 | stat->uid = inode->i_uid; | ||
29 | stat->gid = inode->i_gid; | ||
30 | stat->rdev = inode->i_rdev; | ||
31 | stat->atime = inode->i_atime; | ||
32 | stat->mtime = inode->i_mtime; | ||
33 | stat->ctime = inode->i_ctime; | ||
34 | stat->size = i_size_read(inode); | ||
35 | stat->blocks = inode->i_blocks; | ||
36 | stat->blksize = inode->i_blksize; | ||
37 | } | ||
38 | |||
39 | EXPORT_SYMBOL(generic_fillattr); | ||
40 | |||
41 | int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | ||
42 | { | ||
43 | struct inode *inode = dentry->d_inode; | ||
44 | int retval; | ||
45 | |||
46 | retval = security_inode_getattr(mnt, dentry); | ||
47 | if (retval) | ||
48 | return retval; | ||
49 | |||
50 | if (inode->i_op->getattr) | ||
51 | return inode->i_op->getattr(mnt, dentry, stat); | ||
52 | |||
53 | generic_fillattr(inode, stat); | ||
54 | if (!stat->blksize) { | ||
55 | struct super_block *s = inode->i_sb; | ||
56 | unsigned blocks; | ||
57 | blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits; | ||
58 | stat->blocks = (s->s_blocksize / 512) * blocks; | ||
59 | stat->blksize = s->s_blocksize; | ||
60 | } | ||
61 | return 0; | ||
62 | } | ||
63 | |||
64 | EXPORT_SYMBOL(vfs_getattr); | ||
65 | |||
66 | int vfs_stat(char __user *name, struct kstat *stat) | ||
67 | { | ||
68 | struct nameidata nd; | ||
69 | int error; | ||
70 | |||
71 | error = user_path_walk(name, &nd); | ||
72 | if (!error) { | ||
73 | error = vfs_getattr(nd.mnt, nd.dentry, stat); | ||
74 | path_release(&nd); | ||
75 | } | ||
76 | return error; | ||
77 | } | ||
78 | |||
79 | EXPORT_SYMBOL(vfs_stat); | ||
80 | |||
81 | int vfs_lstat(char __user *name, struct kstat *stat) | ||
82 | { | ||
83 | struct nameidata nd; | ||
84 | int error; | ||
85 | |||
86 | error = user_path_walk_link(name, &nd); | ||
87 | if (!error) { | ||
88 | error = vfs_getattr(nd.mnt, nd.dentry, stat); | ||
89 | path_release(&nd); | ||
90 | } | ||
91 | return error; | ||
92 | } | ||
93 | |||
94 | EXPORT_SYMBOL(vfs_lstat); | ||
95 | |||
96 | int vfs_fstat(unsigned int fd, struct kstat *stat) | ||
97 | { | ||
98 | struct file *f = fget(fd); | ||
99 | int error = -EBADF; | ||
100 | |||
101 | if (f) { | ||
102 | error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat); | ||
103 | fput(f); | ||
104 | } | ||
105 | return error; | ||
106 | } | ||
107 | |||
108 | EXPORT_SYMBOL(vfs_fstat); | ||
109 | |||
110 | #ifdef __ARCH_WANT_OLD_STAT | ||
111 | |||
112 | /* | ||
113 | * For backward compatibility? Maybe this should be moved | ||
114 | * into arch/i386 instead? | ||
115 | */ | ||
116 | static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf) | ||
117 | { | ||
118 | static int warncount = 5; | ||
119 | struct __old_kernel_stat tmp; | ||
120 | |||
121 | if (warncount > 0) { | ||
122 | warncount--; | ||
123 | printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n", | ||
124 | current->comm); | ||
125 | } else if (warncount < 0) { | ||
126 | /* it's laughable, but... */ | ||
127 | warncount = 0; | ||
128 | } | ||
129 | |||
130 | memset(&tmp, 0, sizeof(struct __old_kernel_stat)); | ||
131 | tmp.st_dev = old_encode_dev(stat->dev); | ||
132 | tmp.st_ino = stat->ino; | ||
133 | tmp.st_mode = stat->mode; | ||
134 | tmp.st_nlink = stat->nlink; | ||
135 | if (tmp.st_nlink != stat->nlink) | ||
136 | return -EOVERFLOW; | ||
137 | SET_UID(tmp.st_uid, stat->uid); | ||
138 | SET_GID(tmp.st_gid, stat->gid); | ||
139 | tmp.st_rdev = old_encode_dev(stat->rdev); | ||
140 | #if BITS_PER_LONG == 32 | ||
141 | if (stat->size > MAX_NON_LFS) | ||
142 | return -EOVERFLOW; | ||
143 | #endif | ||
144 | tmp.st_size = stat->size; | ||
145 | tmp.st_atime = stat->atime.tv_sec; | ||
146 | tmp.st_mtime = stat->mtime.tv_sec; | ||
147 | tmp.st_ctime = stat->ctime.tv_sec; | ||
148 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | ||
149 | } | ||
150 | |||
151 | asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf) | ||
152 | { | ||
153 | struct kstat stat; | ||
154 | int error = vfs_stat(filename, &stat); | ||
155 | |||
156 | if (!error) | ||
157 | error = cp_old_stat(&stat, statbuf); | ||
158 | |||
159 | return error; | ||
160 | } | ||
161 | asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf) | ||
162 | { | ||
163 | struct kstat stat; | ||
164 | int error = vfs_lstat(filename, &stat); | ||
165 | |||
166 | if (!error) | ||
167 | error = cp_old_stat(&stat, statbuf); | ||
168 | |||
169 | return error; | ||
170 | } | ||
171 | asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf) | ||
172 | { | ||
173 | struct kstat stat; | ||
174 | int error = vfs_fstat(fd, &stat); | ||
175 | |||
176 | if (!error) | ||
177 | error = cp_old_stat(&stat, statbuf); | ||
178 | |||
179 | return error; | ||
180 | } | ||
181 | |||
182 | #endif /* __ARCH_WANT_OLD_STAT */ | ||
183 | |||
184 | static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf) | ||
185 | { | ||
186 | struct stat tmp; | ||
187 | |||
188 | #if BITS_PER_LONG == 32 | ||
189 | if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) | ||
190 | return -EOVERFLOW; | ||
191 | #else | ||
192 | if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) | ||
193 | return -EOVERFLOW; | ||
194 | #endif | ||
195 | |||
196 | memset(&tmp, 0, sizeof(tmp)); | ||
197 | #if BITS_PER_LONG == 32 | ||
198 | tmp.st_dev = old_encode_dev(stat->dev); | ||
199 | #else | ||
200 | tmp.st_dev = new_encode_dev(stat->dev); | ||
201 | #endif | ||
202 | tmp.st_ino = stat->ino; | ||
203 | tmp.st_mode = stat->mode; | ||
204 | tmp.st_nlink = stat->nlink; | ||
205 | if (tmp.st_nlink != stat->nlink) | ||
206 | return -EOVERFLOW; | ||
207 | SET_UID(tmp.st_uid, stat->uid); | ||
208 | SET_GID(tmp.st_gid, stat->gid); | ||
209 | #if BITS_PER_LONG == 32 | ||
210 | tmp.st_rdev = old_encode_dev(stat->rdev); | ||
211 | #else | ||
212 | tmp.st_rdev = new_encode_dev(stat->rdev); | ||
213 | #endif | ||
214 | #if BITS_PER_LONG == 32 | ||
215 | if (stat->size > MAX_NON_LFS) | ||
216 | return -EOVERFLOW; | ||
217 | #endif | ||
218 | tmp.st_size = stat->size; | ||
219 | tmp.st_atime = stat->atime.tv_sec; | ||
220 | tmp.st_mtime = stat->mtime.tv_sec; | ||
221 | tmp.st_ctime = stat->ctime.tv_sec; | ||
222 | #ifdef STAT_HAVE_NSEC | ||
223 | tmp.st_atime_nsec = stat->atime.tv_nsec; | ||
224 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | ||
225 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | ||
226 | #endif | ||
227 | tmp.st_blocks = stat->blocks; | ||
228 | tmp.st_blksize = stat->blksize; | ||
229 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | ||
230 | } | ||
231 | |||
232 | asmlinkage long sys_newstat(char __user * filename, struct stat __user * statbuf) | ||
233 | { | ||
234 | struct kstat stat; | ||
235 | int error = vfs_stat(filename, &stat); | ||
236 | |||
237 | if (!error) | ||
238 | error = cp_new_stat(&stat, statbuf); | ||
239 | |||
240 | return error; | ||
241 | } | ||
242 | asmlinkage long sys_newlstat(char __user * filename, struct stat __user * statbuf) | ||
243 | { | ||
244 | struct kstat stat; | ||
245 | int error = vfs_lstat(filename, &stat); | ||
246 | |||
247 | if (!error) | ||
248 | error = cp_new_stat(&stat, statbuf); | ||
249 | |||
250 | return error; | ||
251 | } | ||
252 | asmlinkage long sys_newfstat(unsigned int fd, struct stat __user * statbuf) | ||
253 | { | ||
254 | struct kstat stat; | ||
255 | int error = vfs_fstat(fd, &stat); | ||
256 | |||
257 | if (!error) | ||
258 | error = cp_new_stat(&stat, statbuf); | ||
259 | |||
260 | return error; | ||
261 | } | ||
262 | |||
263 | asmlinkage long sys_readlink(const char __user * path, char __user * buf, int bufsiz) | ||
264 | { | ||
265 | struct nameidata nd; | ||
266 | int error; | ||
267 | |||
268 | if (bufsiz <= 0) | ||
269 | return -EINVAL; | ||
270 | |||
271 | error = user_path_walk_link(path, &nd); | ||
272 | if (!error) { | ||
273 | struct inode * inode = nd.dentry->d_inode; | ||
274 | |||
275 | error = -EINVAL; | ||
276 | if (inode->i_op && inode->i_op->readlink) { | ||
277 | error = security_inode_readlink(nd.dentry); | ||
278 | if (!error) { | ||
279 | touch_atime(nd.mnt, nd.dentry); | ||
280 | error = inode->i_op->readlink(nd.dentry, buf, bufsiz); | ||
281 | } | ||
282 | } | ||
283 | path_release(&nd); | ||
284 | } | ||
285 | return error; | ||
286 | } | ||
287 | |||
288 | |||
289 | /* ---------- LFS-64 ----------- */ | ||
290 | #ifdef __ARCH_WANT_STAT64 | ||
291 | |||
292 | static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf) | ||
293 | { | ||
294 | struct stat64 tmp; | ||
295 | |||
296 | memset(&tmp, 0, sizeof(struct stat64)); | ||
297 | #ifdef CONFIG_MIPS | ||
298 | /* mips has weird padding, so we don't get 64 bits there */ | ||
299 | if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev)) | ||
300 | return -EOVERFLOW; | ||
301 | tmp.st_dev = new_encode_dev(stat->dev); | ||
302 | tmp.st_rdev = new_encode_dev(stat->rdev); | ||
303 | #else | ||
304 | tmp.st_dev = huge_encode_dev(stat->dev); | ||
305 | tmp.st_rdev = huge_encode_dev(stat->rdev); | ||
306 | #endif | ||
307 | tmp.st_ino = stat->ino; | ||
308 | #ifdef STAT64_HAS_BROKEN_ST_INO | ||
309 | tmp.__st_ino = stat->ino; | ||
310 | #endif | ||
311 | tmp.st_mode = stat->mode; | ||
312 | tmp.st_nlink = stat->nlink; | ||
313 | tmp.st_uid = stat->uid; | ||
314 | tmp.st_gid = stat->gid; | ||
315 | tmp.st_atime = stat->atime.tv_sec; | ||
316 | tmp.st_atime_nsec = stat->atime.tv_nsec; | ||
317 | tmp.st_mtime = stat->mtime.tv_sec; | ||
318 | tmp.st_mtime_nsec = stat->mtime.tv_nsec; | ||
319 | tmp.st_ctime = stat->ctime.tv_sec; | ||
320 | tmp.st_ctime_nsec = stat->ctime.tv_nsec; | ||
321 | tmp.st_size = stat->size; | ||
322 | tmp.st_blocks = stat->blocks; | ||
323 | tmp.st_blksize = stat->blksize; | ||
324 | return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; | ||
325 | } | ||
326 | |||
327 | asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf) | ||
328 | { | ||
329 | struct kstat stat; | ||
330 | int error = vfs_stat(filename, &stat); | ||
331 | |||
332 | if (!error) | ||
333 | error = cp_new_stat64(&stat, statbuf); | ||
334 | |||
335 | return error; | ||
336 | } | ||
337 | asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf) | ||
338 | { | ||
339 | struct kstat stat; | ||
340 | int error = vfs_lstat(filename, &stat); | ||
341 | |||
342 | if (!error) | ||
343 | error = cp_new_stat64(&stat, statbuf); | ||
344 | |||
345 | return error; | ||
346 | } | ||
347 | asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf) | ||
348 | { | ||
349 | struct kstat stat; | ||
350 | int error = vfs_fstat(fd, &stat); | ||
351 | |||
352 | if (!error) | ||
353 | error = cp_new_stat64(&stat, statbuf); | ||
354 | |||
355 | return error; | ||
356 | } | ||
357 | |||
358 | #endif /* __ARCH_WANT_STAT64 */ | ||
359 | |||
360 | void inode_add_bytes(struct inode *inode, loff_t bytes) | ||
361 | { | ||
362 | spin_lock(&inode->i_lock); | ||
363 | inode->i_blocks += bytes >> 9; | ||
364 | bytes &= 511; | ||
365 | inode->i_bytes += bytes; | ||
366 | if (inode->i_bytes >= 512) { | ||
367 | inode->i_blocks++; | ||
368 | inode->i_bytes -= 512; | ||
369 | } | ||
370 | spin_unlock(&inode->i_lock); | ||
371 | } | ||
372 | |||
373 | EXPORT_SYMBOL(inode_add_bytes); | ||
374 | |||
375 | void inode_sub_bytes(struct inode *inode, loff_t bytes) | ||
376 | { | ||
377 | spin_lock(&inode->i_lock); | ||
378 | inode->i_blocks -= bytes >> 9; | ||
379 | bytes &= 511; | ||
380 | if (inode->i_bytes < bytes) { | ||
381 | inode->i_blocks--; | ||
382 | inode->i_bytes += 512; | ||
383 | } | ||
384 | inode->i_bytes -= bytes; | ||
385 | spin_unlock(&inode->i_lock); | ||
386 | } | ||
387 | |||
388 | EXPORT_SYMBOL(inode_sub_bytes); | ||
389 | |||
390 | loff_t inode_get_bytes(struct inode *inode) | ||
391 | { | ||
392 | loff_t ret; | ||
393 | |||
394 | spin_lock(&inode->i_lock); | ||
395 | ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes; | ||
396 | spin_unlock(&inode->i_lock); | ||
397 | return ret; | ||
398 | } | ||
399 | |||
400 | EXPORT_SYMBOL(inode_get_bytes); | ||
401 | |||
402 | void inode_set_bytes(struct inode *inode, loff_t bytes) | ||
403 | { | ||
404 | /* Caller is here responsible for sufficient locking | ||
405 | * (ie. inode->i_lock) */ | ||
406 | inode->i_blocks = bytes >> 9; | ||
407 | inode->i_bytes = bytes & 511; | ||
408 | } | ||
409 | |||
410 | EXPORT_SYMBOL(inode_set_bytes); | ||