blob: d0ea7ef75e264ef2cccf2c100d4e3a8c7393121c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/stat.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
Paul Gortmaker630d9c42011-11-16 23:57:37 -05007#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/mm.h>
9#include <linux/errno.h>
10#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/highuid.h>
12#include <linux/fs.h>
13#include <linux/namei.h>
14#include <linux/security.h>
15#include <linux/syscalls.h>
Theodore Ts'oba52de12006-09-27 01:50:49 -070016#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
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;
Linus Torvalds3ddcd052011-08-06 22:45:50 -070030 stat->size = i_size_read(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 stat->atime = inode->i_atime;
32 stat->mtime = inode->i_mtime;
33 stat->ctime = inode->i_ctime;
Theodore Ts'oba52de12006-09-27 01:50:49 -070034 stat->blksize = (1 << inode->i_blkbits);
Linus Torvalds3ddcd052011-08-06 22:45:50 -070035 stat->blocks = inode->i_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070036}
37
38EXPORT_SYMBOL(generic_fillattr);
39
Al Viro3dadecc2013-01-24 02:18:08 -050040int vfs_getattr(struct path *path, struct kstat *stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
Al Viro3dadecc2013-01-24 02:18:08 -050042 struct inode *inode = path->dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 int retval;
44
Al Viro3dadecc2013-01-24 02:18:08 -050045 retval = security_inode_getattr(path->mnt, path->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 if (retval)
47 return retval;
48
49 if (inode->i_op->getattr)
Al Viro3dadecc2013-01-24 02:18:08 -050050 return inode->i_op->getattr(path->mnt, path->dentry, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52 generic_fillattr(inode, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 return 0;
54}
55
56EXPORT_SYMBOL(vfs_getattr);
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058int vfs_fstat(unsigned int fd, struct kstat *stat)
59{
Al Viro2903ff02012-08-28 12:52:22 -040060 struct fd f = fdget_raw(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 int error = -EBADF;
62
Al Viro2903ff02012-08-28 12:52:22 -040063 if (f.file) {
Al Viro3dadecc2013-01-24 02:18:08 -050064 error = vfs_getattr(&f.file->f_path, stat);
Al Viro2903ff02012-08-28 12:52:22 -040065 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 }
67 return error;
68}
Linus Torvalds1da177e2005-04-16 15:20:36 -070069EXPORT_SYMBOL(vfs_fstat);
70
David Howellsc7887322010-08-11 11:26:22 +010071int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
72 int flag)
Oleg Drokin0112fc22009-04-08 20:05:42 +040073{
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040074 struct path path;
Oleg Drokin0112fc22009-04-08 20:05:42 +040075 int error = -EINVAL;
Jeff Layton836fb7e2012-12-11 12:10:05 -050076 unsigned int lookup_flags = 0;
Oleg Drokin0112fc22009-04-08 20:05:42 +040077
Al Viro65cfc672011-03-13 15:56:26 -040078 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
79 AT_EMPTY_PATH)) != 0)
Oleg Drokin0112fc22009-04-08 20:05:42 +040080 goto out;
81
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040082 if (!(flag & AT_SYMLINK_NOFOLLOW))
83 lookup_flags |= LOOKUP_FOLLOW;
Al Viro65cfc672011-03-13 15:56:26 -040084 if (flag & AT_EMPTY_PATH)
85 lookup_flags |= LOOKUP_EMPTY;
Jeff Layton836fb7e2012-12-11 12:10:05 -050086retry:
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040087 error = user_path_at(dfd, filename, lookup_flags, &path);
88 if (error)
89 goto out;
90
Al Viro3dadecc2013-01-24 02:18:08 -050091 error = vfs_getattr(&path, stat);
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040092 path_put(&path);
Jeff Layton836fb7e2012-12-11 12:10:05 -050093 if (retry_estale(error, lookup_flags)) {
94 lookup_flags |= LOOKUP_REVAL;
95 goto retry;
96 }
Oleg Drokin0112fc22009-04-08 20:05:42 +040097out:
98 return error;
99}
Oleg Drokin0112fc22009-04-08 20:05:42 +0400100EXPORT_SYMBOL(vfs_fstatat);
101
David Howellsc7887322010-08-11 11:26:22 +0100102int vfs_stat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400103{
104 return vfs_fstatat(AT_FDCWD, name, stat, 0);
105}
106EXPORT_SYMBOL(vfs_stat);
107
David Howellsc7887322010-08-11 11:26:22 +0100108int vfs_lstat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400109{
110 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
111}
112EXPORT_SYMBOL(vfs_lstat);
113
Oleg Drokin0112fc22009-04-08 20:05:42 +0400114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#ifdef __ARCH_WANT_OLD_STAT
116
117/*
118 * For backward compatibility? Maybe this should be moved
119 * into arch/i386 instead?
120 */
121static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
122{
123 static int warncount = 5;
124 struct __old_kernel_stat tmp;
125
126 if (warncount > 0) {
127 warncount--;
128 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
129 current->comm);
130 } else if (warncount < 0) {
131 /* it's laughable, but... */
132 warncount = 0;
133 }
134
135 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
136 tmp.st_dev = old_encode_dev(stat->dev);
137 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700138 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
139 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 tmp.st_mode = stat->mode;
141 tmp.st_nlink = stat->nlink;
142 if (tmp.st_nlink != stat->nlink)
143 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800144 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
145 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 tmp.st_rdev = old_encode_dev(stat->rdev);
147#if BITS_PER_LONG == 32
148 if (stat->size > MAX_NON_LFS)
149 return -EOVERFLOW;
150#endif
151 tmp.st_size = stat->size;
152 tmp.st_atime = stat->atime.tv_sec;
153 tmp.st_mtime = stat->mtime.tv_sec;
154 tmp.st_ctime = stat->ctime.tv_sec;
155 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
156}
157
David Howellsc7887322010-08-11 11:26:22 +0100158SYSCALL_DEFINE2(stat, const char __user *, filename,
159 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400162 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400164 error = vfs_stat(filename, &stat);
165 if (error)
166 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400168 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
Heiko Carstens257ac262009-01-14 14:14:13 +0100170
David Howellsc7887322010-08-11 11:26:22 +0100171SYSCALL_DEFINE2(lstat, const char __user *, filename,
172 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400175 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400177 error = vfs_lstat(filename, &stat);
178 if (error)
179 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400181 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182}
Heiko Carstens257ac262009-01-14 14:14:13 +0100183
184SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185{
186 struct kstat stat;
187 int error = vfs_fstat(fd, &stat);
188
189 if (!error)
190 error = cp_old_stat(&stat, statbuf);
191
192 return error;
193}
194
195#endif /* __ARCH_WANT_OLD_STAT */
196
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700197#if BITS_PER_LONG == 32
198# define choose_32_64(a,b) a
199#else
200# define choose_32_64(a,b) b
201#endif
202
203#define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
204#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
205
Linus Torvalds8529f6132012-05-06 18:02:40 -0700206#ifndef INIT_STRUCT_STAT_PADDING
207# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
208#endif
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
211{
212 struct stat tmp;
213
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700214 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return -EOVERFLOW;
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700216#if BITS_PER_LONG == 32
217 if (stat->size > MAX_NON_LFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 return -EOVERFLOW;
219#endif
220
Linus Torvalds8529f6132012-05-06 18:02:40 -0700221 INIT_STRUCT_STAT_PADDING(tmp);
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700222 tmp.st_dev = encode_dev(stat->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700224 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
225 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 tmp.st_mode = stat->mode;
227 tmp.st_nlink = stat->nlink;
228 if (tmp.st_nlink != stat->nlink)
229 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800230 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
231 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700232 tmp.st_rdev = encode_dev(stat->rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 tmp.st_size = stat->size;
234 tmp.st_atime = stat->atime.tv_sec;
235 tmp.st_mtime = stat->mtime.tv_sec;
236 tmp.st_ctime = stat->ctime.tv_sec;
237#ifdef STAT_HAVE_NSEC
238 tmp.st_atime_nsec = stat->atime.tv_nsec;
239 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
240 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
241#endif
242 tmp.st_blocks = stat->blocks;
243 tmp.st_blksize = stat->blksize;
244 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
245}
246
David Howellsc7887322010-08-11 11:26:22 +0100247SYSCALL_DEFINE2(newstat, const char __user *, filename,
248 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
250 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400251 int error = vfs_stat(filename, &stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400253 if (error)
254 return error;
255 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800257
David Howellsc7887322010-08-11 11:26:22 +0100258SYSCALL_DEFINE2(newlstat, const char __user *, filename,
259 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
261 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400262 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400264 error = vfs_lstat(filename, &stat);
265 if (error)
266 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400268 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800270
Andreas Schwab2833c282006-04-27 15:46:42 +0200271#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
David Howellsc7887322010-08-11 11:26:22 +0100272SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100273 struct stat __user *, statbuf, int, flag)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800274{
275 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400276 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800277
Oleg Drokin0112fc22009-04-08 20:05:42 +0400278 error = vfs_fstatat(dfd, filename, &stat, flag);
279 if (error)
280 return error;
281 return cp_new_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800282}
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800283#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800284
Heiko Carstens257ac262009-01-14 14:14:13 +0100285SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
287 struct kstat stat;
288 int error = vfs_fstat(fd, &stat);
289
290 if (!error)
291 error = cp_new_stat(&stat, statbuf);
292
293 return error;
294}
295
Heiko Carstens6559eed82009-01-14 14:14:32 +0100296SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
297 char __user *, buf, int, bufsiz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298{
Al Viro2d8f3032008-07-22 09:59:21 -0400299 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 int error;
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100301 int empty = 0;
Jeff Layton79551192012-12-11 12:10:06 -0500302 unsigned int lookup_flags = LOOKUP_EMPTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 if (bufsiz <= 0)
305 return -EINVAL;
306
Jeff Layton79551192012-12-11 12:10:06 -0500307retry:
308 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (!error) {
Al Viro2d8f3032008-07-22 09:59:21 -0400310 struct inode *inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100312 error = empty ? -ENOENT : -EINVAL;
Al Viroacfa4382008-12-04 10:06:33 -0500313 if (inode->i_op->readlink) {
Al Viro2d8f3032008-07-22 09:59:21 -0400314 error = security_inode_readlink(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 if (!error) {
Al Viro68ac1232012-03-15 08:21:57 -0400316 touch_atime(&path);
Al Viro2d8f3032008-07-22 09:59:21 -0400317 error = inode->i_op->readlink(path.dentry,
Jan Blunck4ac91372008-02-14 19:34:32 -0800318 buf, bufsiz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 }
320 }
Al Viro2d8f3032008-07-22 09:59:21 -0400321 path_put(&path);
Jeff Layton79551192012-12-11 12:10:06 -0500322 if (retry_estale(error, lookup_flags)) {
323 lookup_flags |= LOOKUP_REVAL;
324 goto retry;
325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327 return error;
328}
329
Heiko Carstens002c8972009-01-14 14:14:18 +0100330SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
331 int, bufsiz)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800332{
333 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
334}
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337/* ---------- LFS-64 ----------- */
Catalin Marinas0753f702012-03-19 15:13:51 +0000338#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Linus Torvalds8529f6132012-05-06 18:02:40 -0700340#ifndef INIT_STRUCT_STAT64_PADDING
341# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
342#endif
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
345{
346 struct stat64 tmp;
347
Linus Torvalds8529f6132012-05-06 18:02:40 -0700348 INIT_STRUCT_STAT64_PADDING(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349#ifdef CONFIG_MIPS
350 /* mips has weird padding, so we don't get 64 bits there */
351 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
352 return -EOVERFLOW;
353 tmp.st_dev = new_encode_dev(stat->dev);
354 tmp.st_rdev = new_encode_dev(stat->rdev);
355#else
356 tmp.st_dev = huge_encode_dev(stat->dev);
357 tmp.st_rdev = huge_encode_dev(stat->rdev);
358#endif
359 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700360 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
361 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362#ifdef STAT64_HAS_BROKEN_ST_INO
363 tmp.__st_ino = stat->ino;
364#endif
365 tmp.st_mode = stat->mode;
366 tmp.st_nlink = stat->nlink;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800367 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
368 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 tmp.st_atime = stat->atime.tv_sec;
370 tmp.st_atime_nsec = stat->atime.tv_nsec;
371 tmp.st_mtime = stat->mtime.tv_sec;
372 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
373 tmp.st_ctime = stat->ctime.tv_sec;
374 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
375 tmp.st_size = stat->size;
376 tmp.st_blocks = stat->blocks;
377 tmp.st_blksize = stat->blksize;
378 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
379}
380
David Howellsc7887322010-08-11 11:26:22 +0100381SYSCALL_DEFINE2(stat64, const char __user *, filename,
382 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 struct kstat stat;
385 int error = vfs_stat(filename, &stat);
386
387 if (!error)
388 error = cp_new_stat64(&stat, statbuf);
389
390 return error;
391}
Heiko Carstens257ac262009-01-14 14:14:13 +0100392
David Howellsc7887322010-08-11 11:26:22 +0100393SYSCALL_DEFINE2(lstat64, const char __user *, filename,
394 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 struct kstat stat;
397 int error = vfs_lstat(filename, &stat);
398
399 if (!error)
400 error = cp_new_stat64(&stat, statbuf);
401
402 return error;
403}
Heiko Carstens257ac262009-01-14 14:14:13 +0100404
405SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406{
407 struct kstat stat;
408 int error = vfs_fstat(fd, &stat);
409
410 if (!error)
411 error = cp_new_stat64(&stat, statbuf);
412
413 return error;
414}
415
David Howellsc7887322010-08-11 11:26:22 +0100416SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100417 struct stat64 __user *, statbuf, int, flag)
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800418{
419 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400420 int error;
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800421
Oleg Drokin0112fc22009-04-08 20:05:42 +0400422 error = vfs_fstatat(dfd, filename, &stat, flag);
423 if (error)
424 return error;
425 return cp_new_stat64(&stat, statbuf);
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800426}
Catalin Marinas0753f702012-03-19 15:13:51 +0000427#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300429/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
430void __inode_add_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 inode->i_blocks += bytes >> 9;
433 bytes &= 511;
434 inode->i_bytes += bytes;
435 if (inode->i_bytes >= 512) {
436 inode->i_blocks++;
437 inode->i_bytes -= 512;
438 }
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300439}
440
441void inode_add_bytes(struct inode *inode, loff_t bytes)
442{
443 spin_lock(&inode->i_lock);
444 __inode_add_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 spin_unlock(&inode->i_lock);
446}
447
448EXPORT_SYMBOL(inode_add_bytes);
449
Jan Kara1c8924e2013-08-17 09:32:32 -0400450void __inode_sub_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 inode->i_blocks -= bytes >> 9;
453 bytes &= 511;
454 if (inode->i_bytes < bytes) {
455 inode->i_blocks--;
456 inode->i_bytes += 512;
457 }
458 inode->i_bytes -= bytes;
Jan Kara1c8924e2013-08-17 09:32:32 -0400459}
460
461EXPORT_SYMBOL(__inode_sub_bytes);
462
463void inode_sub_bytes(struct inode *inode, loff_t bytes)
464{
465 spin_lock(&inode->i_lock);
466 __inode_sub_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 spin_unlock(&inode->i_lock);
468}
469
470EXPORT_SYMBOL(inode_sub_bytes);
471
472loff_t inode_get_bytes(struct inode *inode)
473{
474 loff_t ret;
475
476 spin_lock(&inode->i_lock);
477 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
478 spin_unlock(&inode->i_lock);
479 return ret;
480}
481
482EXPORT_SYMBOL(inode_get_bytes);
483
484void inode_set_bytes(struct inode *inode, loff_t bytes)
485{
486 /* Caller is here responsible for sufficient locking
487 * (ie. inode->i_lock) */
488 inode->i_blocks = bytes >> 9;
489 inode->i_bytes = bytes & 511;
490}
491
492EXPORT_SYMBOL(inode_set_bytes);