KVM: SVM: Emulate next_rip svm feature
[linux/fpc-iii.git] / fs / stat.c
blob12e90e213900542291a0fa74da940c0588b69ace
1 /*
2 * linux/fs/stat.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
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>
18 #include <asm/uaccess.h>
19 #include <asm/unistd.h>
21 void generic_fillattr(struct inode *inode, struct kstat *stat)
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);
38 EXPORT_SYMBOL(generic_fillattr);
40 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
42 struct inode *inode = dentry->d_inode;
43 int retval;
45 retval = security_inode_getattr(mnt, dentry);
46 if (retval)
47 return retval;
49 if (inode->i_op->getattr)
50 return inode->i_op->getattr(mnt, dentry, stat);
52 generic_fillattr(inode, stat);
53 return 0;
56 EXPORT_SYMBOL(vfs_getattr);
58 int vfs_fstat(unsigned int fd, struct kstat *stat)
60 struct file *f = fget(fd);
61 int error = -EBADF;
63 if (f) {
64 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
65 fput(f);
67 return error;
69 EXPORT_SYMBOL(vfs_fstat);
71 int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
72 int flag)
74 struct path path;
75 int error = -EINVAL;
76 int lookup_flags = 0;
78 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
79 goto out;
81 if (!(flag & AT_SYMLINK_NOFOLLOW))
82 lookup_flags |= LOOKUP_FOLLOW;
84 error = user_path_at(dfd, filename, lookup_flags, &path);
85 if (error)
86 goto out;
88 error = vfs_getattr(path.mnt, path.dentry, stat);
89 path_put(&path);
90 out:
91 return error;
93 EXPORT_SYMBOL(vfs_fstatat);
95 int vfs_stat(const char __user *name, struct kstat *stat)
97 return vfs_fstatat(AT_FDCWD, name, stat, 0);
99 EXPORT_SYMBOL(vfs_stat);
101 int vfs_lstat(const char __user *name, struct kstat *stat)
103 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
105 EXPORT_SYMBOL(vfs_lstat);
108 #ifdef __ARCH_WANT_OLD_STAT
111 * For backward compatibility? Maybe this should be moved
112 * into arch/i386 instead?
114 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
116 static int warncount = 5;
117 struct __old_kernel_stat tmp;
119 if (warncount > 0) {
120 warncount--;
121 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
122 current->comm);
123 } else if (warncount < 0) {
124 /* it's laughable, but... */
125 warncount = 0;
128 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
129 tmp.st_dev = old_encode_dev(stat->dev);
130 tmp.st_ino = stat->ino;
131 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
132 return -EOVERFLOW;
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;
151 SYSCALL_DEFINE2(stat, const char __user *, filename,
152 struct __old_kernel_stat __user *, statbuf)
154 struct kstat stat;
155 int error;
157 error = vfs_stat(filename, &stat);
158 if (error)
159 return error;
161 return cp_old_stat(&stat, statbuf);
164 SYSCALL_DEFINE2(lstat, const char __user *, filename,
165 struct __old_kernel_stat __user *, statbuf)
167 struct kstat stat;
168 int error;
170 error = vfs_lstat(filename, &stat);
171 if (error)
172 return error;
174 return cp_old_stat(&stat, statbuf);
177 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
179 struct kstat stat;
180 int error = vfs_fstat(fd, &stat);
182 if (!error)
183 error = cp_old_stat(&stat, statbuf);
185 return error;
188 #endif /* __ARCH_WANT_OLD_STAT */
190 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
192 struct stat tmp;
194 #if BITS_PER_LONG == 32
195 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
196 return -EOVERFLOW;
197 #else
198 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
199 return -EOVERFLOW;
200 #endif
202 memset(&tmp, 0, sizeof(tmp));
203 #if BITS_PER_LONG == 32
204 tmp.st_dev = old_encode_dev(stat->dev);
205 #else
206 tmp.st_dev = new_encode_dev(stat->dev);
207 #endif
208 tmp.st_ino = stat->ino;
209 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
210 return -EOVERFLOW;
211 tmp.st_mode = stat->mode;
212 tmp.st_nlink = stat->nlink;
213 if (tmp.st_nlink != stat->nlink)
214 return -EOVERFLOW;
215 SET_UID(tmp.st_uid, stat->uid);
216 SET_GID(tmp.st_gid, stat->gid);
217 #if BITS_PER_LONG == 32
218 tmp.st_rdev = old_encode_dev(stat->rdev);
219 #else
220 tmp.st_rdev = new_encode_dev(stat->rdev);
221 #endif
222 #if BITS_PER_LONG == 32
223 if (stat->size > MAX_NON_LFS)
224 return -EOVERFLOW;
225 #endif
226 tmp.st_size = stat->size;
227 tmp.st_atime = stat->atime.tv_sec;
228 tmp.st_mtime = stat->mtime.tv_sec;
229 tmp.st_ctime = stat->ctime.tv_sec;
230 #ifdef STAT_HAVE_NSEC
231 tmp.st_atime_nsec = stat->atime.tv_nsec;
232 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
233 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
234 #endif
235 tmp.st_blocks = stat->blocks;
236 tmp.st_blksize = stat->blksize;
237 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
240 SYSCALL_DEFINE2(newstat, const char __user *, filename,
241 struct stat __user *, statbuf)
243 struct kstat stat;
244 int error = vfs_stat(filename, &stat);
246 if (error)
247 return error;
248 return cp_new_stat(&stat, statbuf);
251 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
252 struct stat __user *, statbuf)
254 struct kstat stat;
255 int error;
257 error = vfs_lstat(filename, &stat);
258 if (error)
259 return error;
261 return cp_new_stat(&stat, statbuf);
264 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
265 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
266 struct stat __user *, statbuf, int, flag)
268 struct kstat stat;
269 int error;
271 error = vfs_fstatat(dfd, filename, &stat, flag);
272 if (error)
273 return error;
274 return cp_new_stat(&stat, statbuf);
276 #endif
278 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
280 struct kstat stat;
281 int error = vfs_fstat(fd, &stat);
283 if (!error)
284 error = cp_new_stat(&stat, statbuf);
286 return error;
289 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
290 char __user *, buf, int, bufsiz)
292 struct path path;
293 int error;
295 if (bufsiz <= 0)
296 return -EINVAL;
298 error = user_path_at(dfd, pathname, 0, &path);
299 if (!error) {
300 struct inode *inode = path.dentry->d_inode;
302 error = -EINVAL;
303 if (inode->i_op->readlink) {
304 error = security_inode_readlink(path.dentry);
305 if (!error) {
306 touch_atime(path.mnt, path.dentry);
307 error = inode->i_op->readlink(path.dentry,
308 buf, bufsiz);
311 path_put(&path);
313 return error;
316 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
317 int, bufsiz)
319 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
323 /* ---------- LFS-64 ----------- */
324 #ifdef __ARCH_WANT_STAT64
326 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
328 struct stat64 tmp;
330 memset(&tmp, 0, sizeof(struct stat64));
331 #ifdef CONFIG_MIPS
332 /* mips has weird padding, so we don't get 64 bits there */
333 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
334 return -EOVERFLOW;
335 tmp.st_dev = new_encode_dev(stat->dev);
336 tmp.st_rdev = new_encode_dev(stat->rdev);
337 #else
338 tmp.st_dev = huge_encode_dev(stat->dev);
339 tmp.st_rdev = huge_encode_dev(stat->rdev);
340 #endif
341 tmp.st_ino = stat->ino;
342 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
343 return -EOVERFLOW;
344 #ifdef STAT64_HAS_BROKEN_ST_INO
345 tmp.__st_ino = stat->ino;
346 #endif
347 tmp.st_mode = stat->mode;
348 tmp.st_nlink = stat->nlink;
349 tmp.st_uid = stat->uid;
350 tmp.st_gid = stat->gid;
351 tmp.st_atime = stat->atime.tv_sec;
352 tmp.st_atime_nsec = stat->atime.tv_nsec;
353 tmp.st_mtime = stat->mtime.tv_sec;
354 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
355 tmp.st_ctime = stat->ctime.tv_sec;
356 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
357 tmp.st_size = stat->size;
358 tmp.st_blocks = stat->blocks;
359 tmp.st_blksize = stat->blksize;
360 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
363 SYSCALL_DEFINE2(stat64, const char __user *, filename,
364 struct stat64 __user *, statbuf)
366 struct kstat stat;
367 int error = vfs_stat(filename, &stat);
369 if (!error)
370 error = cp_new_stat64(&stat, statbuf);
372 return error;
375 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
376 struct stat64 __user *, statbuf)
378 struct kstat stat;
379 int error = vfs_lstat(filename, &stat);
381 if (!error)
382 error = cp_new_stat64(&stat, statbuf);
384 return error;
387 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
389 struct kstat stat;
390 int error = vfs_fstat(fd, &stat);
392 if (!error)
393 error = cp_new_stat64(&stat, statbuf);
395 return error;
398 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
399 struct stat64 __user *, statbuf, int, flag)
401 struct kstat stat;
402 int error;
404 error = vfs_fstatat(dfd, filename, &stat, flag);
405 if (error)
406 return error;
407 return cp_new_stat64(&stat, statbuf);
409 #endif /* __ARCH_WANT_STAT64 */
411 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
412 void __inode_add_bytes(struct inode *inode, loff_t bytes)
414 inode->i_blocks += bytes >> 9;
415 bytes &= 511;
416 inode->i_bytes += bytes;
417 if (inode->i_bytes >= 512) {
418 inode->i_blocks++;
419 inode->i_bytes -= 512;
423 void inode_add_bytes(struct inode *inode, loff_t bytes)
425 spin_lock(&inode->i_lock);
426 __inode_add_bytes(inode, bytes);
427 spin_unlock(&inode->i_lock);
430 EXPORT_SYMBOL(inode_add_bytes);
432 void inode_sub_bytes(struct inode *inode, loff_t bytes)
434 spin_lock(&inode->i_lock);
435 inode->i_blocks -= bytes >> 9;
436 bytes &= 511;
437 if (inode->i_bytes < bytes) {
438 inode->i_blocks--;
439 inode->i_bytes += 512;
441 inode->i_bytes -= bytes;
442 spin_unlock(&inode->i_lock);
445 EXPORT_SYMBOL(inode_sub_bytes);
447 loff_t inode_get_bytes(struct inode *inode)
449 loff_t ret;
451 spin_lock(&inode->i_lock);
452 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
453 spin_unlock(&inode->i_lock);
454 return ret;
457 EXPORT_SYMBOL(inode_get_bytes);
459 void inode_set_bytes(struct inode *inode, loff_t bytes)
461 /* Caller is here responsible for sufficient locking
462 * (ie. inode->i_lock) */
463 inode->i_blocks = bytes >> 9;
464 inode->i_bytes = bytes & 511;
467 EXPORT_SYMBOL(inode_set_bytes);