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1/*
2 * linux/fs/stat.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7#include <linux/export.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
21void 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->size = i_size_read(inode);
31 stat->atime = inode->i_atime;
32 stat->mtime = inode->i_mtime;
33 stat->ctime = inode->i_ctime;
34 stat->blksize = (1 << inode->i_blkbits);
35 stat->blocks = inode->i_blocks;
36}
37
38EXPORT_SYMBOL(generic_fillattr);
39
40int 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
56EXPORT_SYMBOL(vfs_getattr);
57
58int vfs_fstat(unsigned int fd, struct kstat *stat)
59{
60 int fput_needed;
61 struct file *f = fget_raw_light(fd, &fput_needed);
62 int error = -EBADF;
63
64 if (f) {
65 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
66 fput_light(f, fput_needed);
67 }
68 return error;
69}
70EXPORT_SYMBOL(vfs_fstat);
71
72int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
73 int flag)
74{
75 struct path path;
76 int error = -EINVAL;
77 int lookup_flags = 0;
78
79 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
80 AT_EMPTY_PATH)) != 0)
81 goto out;
82
83 if (!(flag & AT_SYMLINK_NOFOLLOW))
84 lookup_flags |= LOOKUP_FOLLOW;
85 if (flag & AT_EMPTY_PATH)
86 lookup_flags |= LOOKUP_EMPTY;
87
88 error = user_path_at(dfd, filename, lookup_flags, &path);
89 if (error)
90 goto out;
91
92 error = vfs_getattr(path.mnt, path.dentry, stat);
93 path_put(&path);
94out:
95 return error;
96}
97EXPORT_SYMBOL(vfs_fstatat);
98
99int vfs_stat(const char __user *name, struct kstat *stat)
100{
101 return vfs_fstatat(AT_FDCWD, name, stat, 0);
102}
103EXPORT_SYMBOL(vfs_stat);
104
105int vfs_lstat(const char __user *name, struct kstat *stat)
106{
107 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
108}
109EXPORT_SYMBOL(vfs_lstat);
110
111
112#ifdef __ARCH_WANT_OLD_STAT
113
114/*
115 * For backward compatibility? Maybe this should be moved
116 * into arch/i386 instead?
117 */
118static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
119{
120 static int warncount = 5;
121 struct __old_kernel_stat tmp;
122
123 if (warncount > 0) {
124 warncount--;
125 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
126 current->comm);
127 } else if (warncount < 0) {
128 /* it's laughable, but... */
129 warncount = 0;
130 }
131
132 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
133 tmp.st_dev = old_encode_dev(stat->dev);
134 tmp.st_ino = stat->ino;
135 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
136 return -EOVERFLOW;
137 tmp.st_mode = stat->mode;
138 tmp.st_nlink = stat->nlink;
139 if (tmp.st_nlink != stat->nlink)
140 return -EOVERFLOW;
141 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
142 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
143 tmp.st_rdev = old_encode_dev(stat->rdev);
144#if BITS_PER_LONG == 32
145 if (stat->size > MAX_NON_LFS)
146 return -EOVERFLOW;
147#endif
148 tmp.st_size = stat->size;
149 tmp.st_atime = stat->atime.tv_sec;
150 tmp.st_mtime = stat->mtime.tv_sec;
151 tmp.st_ctime = stat->ctime.tv_sec;
152 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
153}
154
155SYSCALL_DEFINE2(stat, const char __user *, filename,
156 struct __old_kernel_stat __user *, statbuf)
157{
158 struct kstat stat;
159 int error;
160
161 error = vfs_stat(filename, &stat);
162 if (error)
163 return error;
164
165 return cp_old_stat(&stat, statbuf);
166}
167
168SYSCALL_DEFINE2(lstat, const char __user *, filename,
169 struct __old_kernel_stat __user *, statbuf)
170{
171 struct kstat stat;
172 int error;
173
174 error = vfs_lstat(filename, &stat);
175 if (error)
176 return error;
177
178 return cp_old_stat(&stat, statbuf);
179}
180
181SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
182{
183 struct kstat stat;
184 int error = vfs_fstat(fd, &stat);
185
186 if (!error)
187 error = cp_old_stat(&stat, statbuf);
188
189 return error;
190}
191
192#endif /* __ARCH_WANT_OLD_STAT */
193
194#if BITS_PER_LONG == 32
195# define choose_32_64(a,b) a
196#else
197# define choose_32_64(a,b) b
198#endif
199
200#define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
201#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
202
203#ifndef INIT_STRUCT_STAT_PADDING
204# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
205#endif
206
207static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
208{
209 struct stat tmp;
210
211 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
212 return -EOVERFLOW;
213#if BITS_PER_LONG == 32
214 if (stat->size > MAX_NON_LFS)
215 return -EOVERFLOW;
216#endif
217
218 INIT_STRUCT_STAT_PADDING(tmp);
219 tmp.st_dev = encode_dev(stat->dev);
220 tmp.st_ino = stat->ino;
221 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
222 return -EOVERFLOW;
223 tmp.st_mode = stat->mode;
224 tmp.st_nlink = stat->nlink;
225 if (tmp.st_nlink != stat->nlink)
226 return -EOVERFLOW;
227 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
228 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
229 tmp.st_rdev = encode_dev(stat->rdev);
230 tmp.st_size = stat->size;
231 tmp.st_atime = stat->atime.tv_sec;
232 tmp.st_mtime = stat->mtime.tv_sec;
233 tmp.st_ctime = stat->ctime.tv_sec;
234#ifdef STAT_HAVE_NSEC
235 tmp.st_atime_nsec = stat->atime.tv_nsec;
236 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
237 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
238#endif
239 tmp.st_blocks = stat->blocks;
240 tmp.st_blksize = stat->blksize;
241 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
242}
243
244SYSCALL_DEFINE2(newstat, const char __user *, filename,
245 struct stat __user *, statbuf)
246{
247 struct kstat stat;
248 int error = vfs_stat(filename, &stat);
249
250 if (error)
251 return error;
252 return cp_new_stat(&stat, statbuf);
253}
254
255SYSCALL_DEFINE2(newlstat, const char __user *, filename,
256 struct stat __user *, statbuf)
257{
258 struct kstat stat;
259 int error;
260
261 error = vfs_lstat(filename, &stat);
262 if (error)
263 return error;
264
265 return cp_new_stat(&stat, statbuf);
266}
267
268#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
269SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
270 struct stat __user *, statbuf, int, flag)
271{
272 struct kstat stat;
273 int error;
274
275 error = vfs_fstatat(dfd, filename, &stat, flag);
276 if (error)
277 return error;
278 return cp_new_stat(&stat, statbuf);
279}
280#endif
281
282SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
283{
284 struct kstat stat;
285 int error = vfs_fstat(fd, &stat);
286
287 if (!error)
288 error = cp_new_stat(&stat, statbuf);
289
290 return error;
291}
292
293SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
294 char __user *, buf, int, bufsiz)
295{
296 struct path path;
297 int error;
298 int empty = 0;
299
300 if (bufsiz <= 0)
301 return -EINVAL;
302
303 error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
304 if (!error) {
305 struct inode *inode = path.dentry->d_inode;
306
307 error = empty ? -ENOENT : -EINVAL;
308 if (inode->i_op->readlink) {
309 error = security_inode_readlink(path.dentry);
310 if (!error) {
311 touch_atime(&path);
312 error = inode->i_op->readlink(path.dentry,
313 buf, bufsiz);
314 }
315 }
316 path_put(&path);
317 }
318 return error;
319}
320
321SYSCALL_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#ifndef INIT_STRUCT_STAT64_PADDING
332# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
333#endif
334
335static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
336{
337 struct stat64 tmp;
338
339 INIT_STRUCT_STAT64_PADDING(tmp);
340#ifdef CONFIG_MIPS
341 /* mips has weird padding, so we don't get 64 bits there */
342 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
343 return -EOVERFLOW;
344 tmp.st_dev = new_encode_dev(stat->dev);
345 tmp.st_rdev = new_encode_dev(stat->rdev);
346#else
347 tmp.st_dev = huge_encode_dev(stat->dev);
348 tmp.st_rdev = huge_encode_dev(stat->rdev);
349#endif
350 tmp.st_ino = stat->ino;
351 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
352 return -EOVERFLOW;
353#ifdef STAT64_HAS_BROKEN_ST_INO
354 tmp.__st_ino = stat->ino;
355#endif
356 tmp.st_mode = stat->mode;
357 tmp.st_nlink = stat->nlink;
358 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
359 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
360 tmp.st_atime = stat->atime.tv_sec;
361 tmp.st_atime_nsec = stat->atime.tv_nsec;
362 tmp.st_mtime = stat->mtime.tv_sec;
363 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
364 tmp.st_ctime = stat->ctime.tv_sec;
365 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
366 tmp.st_size = stat->size;
367 tmp.st_blocks = stat->blocks;
368 tmp.st_blksize = stat->blksize;
369 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
370}
371
372SYSCALL_DEFINE2(stat64, const char __user *, filename,
373 struct stat64 __user *, statbuf)
374{
375 struct kstat stat;
376 int error = vfs_stat(filename, &stat);
377
378 if (!error)
379 error = cp_new_stat64(&stat, statbuf);
380
381 return error;
382}
383
384SYSCALL_DEFINE2(lstat64, const char __user *, filename,
385 struct stat64 __user *, statbuf)
386{
387 struct kstat stat;
388 int error = vfs_lstat(filename, &stat);
389
390 if (!error)
391 error = cp_new_stat64(&stat, statbuf);
392
393 return error;
394}
395
396SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
397{
398 struct kstat stat;
399 int error = vfs_fstat(fd, &stat);
400
401 if (!error)
402 error = cp_new_stat64(&stat, statbuf);
403
404 return error;
405}
406
407SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
408 struct stat64 __user *, statbuf, int, flag)
409{
410 struct kstat stat;
411 int error;
412
413 error = vfs_fstatat(dfd, filename, &stat, flag);
414 if (error)
415 return error;
416 return cp_new_stat64(&stat, statbuf);
417}
418#endif /* __ARCH_WANT_STAT64 */
419
420/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
421void __inode_add_bytes(struct inode *inode, loff_t bytes)
422{
423 inode->i_blocks += bytes >> 9;
424 bytes &= 511;
425 inode->i_bytes += bytes;
426 if (inode->i_bytes >= 512) {
427 inode->i_blocks++;
428 inode->i_bytes -= 512;
429 }
430}
431
432void inode_add_bytes(struct inode *inode, loff_t bytes)
433{
434 spin_lock(&inode->i_lock);
435 __inode_add_bytes(inode, bytes);
436 spin_unlock(&inode->i_lock);
437}
438
439EXPORT_SYMBOL(inode_add_bytes);
440
441void inode_sub_bytes(struct inode *inode, loff_t bytes)
442{
443 spin_lock(&inode->i_lock);
444 inode->i_blocks -= bytes >> 9;
445 bytes &= 511;
446 if (inode->i_bytes < bytes) {
447 inode->i_blocks--;
448 inode->i_bytes += 512;
449 }
450 inode->i_bytes -= bytes;
451 spin_unlock(&inode->i_lock);
452}
453
454EXPORT_SYMBOL(inode_sub_bytes);
455
456loff_t inode_get_bytes(struct inode *inode)
457{
458 loff_t ret;
459
460 spin_lock(&inode->i_lock);
461 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
462 spin_unlock(&inode->i_lock);
463 return ret;
464}
465
466EXPORT_SYMBOL(inode_get_bytes);
467
468void inode_set_bytes(struct inode *inode, loff_t bytes)
469{
470 /* Caller is here responsible for sufficient locking
471 * (ie. inode->i_lock) */
472 inode->i_blocks = bytes >> 9;
473 inode->i_bytes = bytes & 511;
474}
475
476EXPORT_SYMBOL(inode_set_bytes);
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
21void 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->size = i_size_read(inode);
31 stat->atime = inode->i_atime;
32 stat->mtime = inode->i_mtime;
33 stat->ctime = inode->i_ctime;
34 stat->blksize = (1 << inode->i_blkbits);
35 stat->blocks = inode->i_blocks;
36}
37
38EXPORT_SYMBOL(generic_fillattr);
39
40int 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
56EXPORT_SYMBOL(vfs_getattr);
57
58int 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}
69EXPORT_SYMBOL(vfs_fstat);
70
71int 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_EMPTY_PATH)
85 lookup_flags |= LOOKUP_EMPTY;
86
87 error = user_path_at(dfd, filename, lookup_flags, &path);
88 if (error)
89 goto out;
90
91 error = vfs_getattr(path.mnt, path.dentry, stat);
92 path_put(&path);
93out:
94 return error;
95}
96EXPORT_SYMBOL(vfs_fstatat);
97
98int vfs_stat(const char __user *name, struct kstat *stat)
99{
100 return vfs_fstatat(AT_FDCWD, name, stat, 0);
101}
102EXPORT_SYMBOL(vfs_stat);
103
104int vfs_lstat(const char __user *name, struct kstat *stat)
105{
106 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
107}
108EXPORT_SYMBOL(vfs_lstat);
109
110
111#ifdef __ARCH_WANT_OLD_STAT
112
113/*
114 * For backward compatibility? Maybe this should be moved
115 * into arch/i386 instead?
116 */
117static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
118{
119 static int warncount = 5;
120 struct __old_kernel_stat tmp;
121
122 if (warncount > 0) {
123 warncount--;
124 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
125 current->comm);
126 } else if (warncount < 0) {
127 /* it's laughable, but... */
128 warncount = 0;
129 }
130
131 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
132 tmp.st_dev = old_encode_dev(stat->dev);
133 tmp.st_ino = stat->ino;
134 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
135 return -EOVERFLOW;
136 tmp.st_mode = stat->mode;
137 tmp.st_nlink = stat->nlink;
138 if (tmp.st_nlink != stat->nlink)
139 return -EOVERFLOW;
140 SET_UID(tmp.st_uid, stat->uid);
141 SET_GID(tmp.st_gid, stat->gid);
142 tmp.st_rdev = old_encode_dev(stat->rdev);
143#if BITS_PER_LONG == 32
144 if (stat->size > MAX_NON_LFS)
145 return -EOVERFLOW;
146#endif
147 tmp.st_size = stat->size;
148 tmp.st_atime = stat->atime.tv_sec;
149 tmp.st_mtime = stat->mtime.tv_sec;
150 tmp.st_ctime = stat->ctime.tv_sec;
151 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
152}
153
154SYSCALL_DEFINE2(stat, const char __user *, filename,
155 struct __old_kernel_stat __user *, statbuf)
156{
157 struct kstat stat;
158 int error;
159
160 error = vfs_stat(filename, &stat);
161 if (error)
162 return error;
163
164 return cp_old_stat(&stat, statbuf);
165}
166
167SYSCALL_DEFINE2(lstat, const char __user *, filename,
168 struct __old_kernel_stat __user *, statbuf)
169{
170 struct kstat stat;
171 int error;
172
173 error = vfs_lstat(filename, &stat);
174 if (error)
175 return error;
176
177 return cp_old_stat(&stat, statbuf);
178}
179
180SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
181{
182 struct kstat stat;
183 int error = vfs_fstat(fd, &stat);
184
185 if (!error)
186 error = cp_old_stat(&stat, statbuf);
187
188 return error;
189}
190
191#endif /* __ARCH_WANT_OLD_STAT */
192
193static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
194{
195 struct stat tmp;
196
197#if BITS_PER_LONG == 32
198 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
199 return -EOVERFLOW;
200#else
201 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
202 return -EOVERFLOW;
203#endif
204
205 memset(&tmp, 0, sizeof(tmp));
206#if BITS_PER_LONG == 32
207 tmp.st_dev = old_encode_dev(stat->dev);
208#else
209 tmp.st_dev = new_encode_dev(stat->dev);
210#endif
211 tmp.st_ino = stat->ino;
212 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
213 return -EOVERFLOW;
214 tmp.st_mode = stat->mode;
215 tmp.st_nlink = stat->nlink;
216 if (tmp.st_nlink != stat->nlink)
217 return -EOVERFLOW;
218 SET_UID(tmp.st_uid, stat->uid);
219 SET_GID(tmp.st_gid, stat->gid);
220#if BITS_PER_LONG == 32
221 tmp.st_rdev = old_encode_dev(stat->rdev);
222#else
223 tmp.st_rdev = new_encode_dev(stat->rdev);
224#endif
225#if BITS_PER_LONG == 32
226 if (stat->size > MAX_NON_LFS)
227 return -EOVERFLOW;
228#endif
229 tmp.st_size = stat->size;
230 tmp.st_atime = stat->atime.tv_sec;
231 tmp.st_mtime = stat->mtime.tv_sec;
232 tmp.st_ctime = stat->ctime.tv_sec;
233#ifdef STAT_HAVE_NSEC
234 tmp.st_atime_nsec = stat->atime.tv_nsec;
235 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
236 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
237#endif
238 tmp.st_blocks = stat->blocks;
239 tmp.st_blksize = stat->blksize;
240 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
241}
242
243SYSCALL_DEFINE2(newstat, const char __user *, filename,
244 struct stat __user *, statbuf)
245{
246 struct kstat stat;
247 int error = vfs_stat(filename, &stat);
248
249 if (error)
250 return error;
251 return cp_new_stat(&stat, statbuf);
252}
253
254SYSCALL_DEFINE2(newlstat, const char __user *, filename,
255 struct stat __user *, statbuf)
256{
257 struct kstat stat;
258 int error;
259
260 error = vfs_lstat(filename, &stat);
261 if (error)
262 return error;
263
264 return cp_new_stat(&stat, statbuf);
265}
266
267#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
268SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
269 struct stat __user *, statbuf, int, flag)
270{
271 struct kstat stat;
272 int error;
273
274 error = vfs_fstatat(dfd, filename, &stat, flag);
275 if (error)
276 return error;
277 return cp_new_stat(&stat, statbuf);
278}
279#endif
280
281SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
282{
283 struct kstat stat;
284 int error = vfs_fstat(fd, &stat);
285
286 if (!error)
287 error = cp_new_stat(&stat, statbuf);
288
289 return error;
290}
291
292SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
293 char __user *, buf, int, bufsiz)
294{
295 struct path path;
296 int error;
297
298 if (bufsiz <= 0)
299 return -EINVAL;
300
301 error = user_path_at(dfd, pathname, LOOKUP_EMPTY, &path);
302 if (!error) {
303 struct inode *inode = path.dentry->d_inode;
304
305 error = -EINVAL;
306 if (inode->i_op->readlink) {
307 error = security_inode_readlink(path.dentry);
308 if (!error) {
309 touch_atime(path.mnt, path.dentry);
310 error = inode->i_op->readlink(path.dentry,
311 buf, bufsiz);
312 }
313 }
314 path_put(&path);
315 }
316 return error;
317}
318
319SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
320 int, bufsiz)
321{
322 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
323}
324
325
326/* ---------- LFS-64 ----------- */
327#ifdef __ARCH_WANT_STAT64
328
329static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
330{
331 struct stat64 tmp;
332
333 memset(&tmp, 0, sizeof(struct stat64));
334#ifdef CONFIG_MIPS
335 /* mips has weird padding, so we don't get 64 bits there */
336 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
337 return -EOVERFLOW;
338 tmp.st_dev = new_encode_dev(stat->dev);
339 tmp.st_rdev = new_encode_dev(stat->rdev);
340#else
341 tmp.st_dev = huge_encode_dev(stat->dev);
342 tmp.st_rdev = huge_encode_dev(stat->rdev);
343#endif
344 tmp.st_ino = stat->ino;
345 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
346 return -EOVERFLOW;
347#ifdef STAT64_HAS_BROKEN_ST_INO
348 tmp.__st_ino = stat->ino;
349#endif
350 tmp.st_mode = stat->mode;
351 tmp.st_nlink = stat->nlink;
352 tmp.st_uid = stat->uid;
353 tmp.st_gid = stat->gid;
354 tmp.st_atime = stat->atime.tv_sec;
355 tmp.st_atime_nsec = stat->atime.tv_nsec;
356 tmp.st_mtime = stat->mtime.tv_sec;
357 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
358 tmp.st_ctime = stat->ctime.tv_sec;
359 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
360 tmp.st_size = stat->size;
361 tmp.st_blocks = stat->blocks;
362 tmp.st_blksize = stat->blksize;
363 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
364}
365
366SYSCALL_DEFINE2(stat64, const char __user *, filename,
367 struct stat64 __user *, statbuf)
368{
369 struct kstat stat;
370 int error = vfs_stat(filename, &stat);
371
372 if (!error)
373 error = cp_new_stat64(&stat, statbuf);
374
375 return error;
376}
377
378SYSCALL_DEFINE2(lstat64, const char __user *, filename,
379 struct stat64 __user *, statbuf)
380{
381 struct kstat stat;
382 int error = vfs_lstat(filename, &stat);
383
384 if (!error)
385 error = cp_new_stat64(&stat, statbuf);
386
387 return error;
388}
389
390SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
391{
392 struct kstat stat;
393 int error = vfs_fstat(fd, &stat);
394
395 if (!error)
396 error = cp_new_stat64(&stat, statbuf);
397
398 return error;
399}
400
401SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
402 struct stat64 __user *, statbuf, int, flag)
403{
404 struct kstat stat;
405 int error;
406
407 error = vfs_fstatat(dfd, filename, &stat, flag);
408 if (error)
409 return error;
410 return cp_new_stat64(&stat, statbuf);
411}
412#endif /* __ARCH_WANT_STAT64 */
413
414/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
415void __inode_add_bytes(struct inode *inode, loff_t bytes)
416{
417 inode->i_blocks += bytes >> 9;
418 bytes &= 511;
419 inode->i_bytes += bytes;
420 if (inode->i_bytes >= 512) {
421 inode->i_blocks++;
422 inode->i_bytes -= 512;
423 }
424}
425
426void inode_add_bytes(struct inode *inode, loff_t bytes)
427{
428 spin_lock(&inode->i_lock);
429 __inode_add_bytes(inode, bytes);
430 spin_unlock(&inode->i_lock);
431}
432
433EXPORT_SYMBOL(inode_add_bytes);
434
435void inode_sub_bytes(struct inode *inode, loff_t bytes)
436{
437 spin_lock(&inode->i_lock);
438 inode->i_blocks -= bytes >> 9;
439 bytes &= 511;
440 if (inode->i_bytes < bytes) {
441 inode->i_blocks--;
442 inode->i_bytes += 512;
443 }
444 inode->i_bytes -= bytes;
445 spin_unlock(&inode->i_lock);
446}
447
448EXPORT_SYMBOL(inode_sub_bytes);
449
450loff_t inode_get_bytes(struct inode *inode)
451{
452 loff_t ret;
453
454 spin_lock(&inode->i_lock);
455 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
456 spin_unlock(&inode->i_lock);
457 return ret;
458}
459
460EXPORT_SYMBOL(inode_get_bytes);
461
462void inode_set_bytes(struct inode *inode, loff_t bytes)
463{
464 /* Caller is here responsible for sufficient locking
465 * (ie. inode->i_lock) */
466 inode->i_blocks = bytes >> 9;
467 inode->i_bytes = bytes & 511;
468}
469
470EXPORT_SYMBOL(inode_set_bytes);