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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
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080018#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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
J. Bruce Fieldsb7a6ec52013-10-02 17:01:18 -040040/**
41 * vfs_getattr_nosec - getattr without security checks
42 * @path: file to get attributes from
43 * @stat: structure to return attributes in
44 *
45 * Get attributes without calling security_inode_getattr.
46 *
47 * Currently the only caller other than vfs_getattr is internal to the
48 * filehandle lookup code, which uses only the inode number and returns
49 * no attributes to any user. Any other code probably wants
50 * vfs_getattr.
51 */
52int vfs_getattr_nosec(struct path *path, struct kstat *stat)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
David Howellsbb6687342015-03-17 22:26:21 +000054 struct inode *inode = d_backing_inode(path->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56 if (inode->i_op->getattr)
Al Viro3dadecc2013-01-24 02:18:08 -050057 return inode->i_op->getattr(path->mnt, path->dentry, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 generic_fillattr(inode, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return 0;
61}
62
J. Bruce Fieldsb7a6ec52013-10-02 17:01:18 -040063EXPORT_SYMBOL(vfs_getattr_nosec);
64
65int vfs_getattr(struct path *path, struct kstat *stat)
66{
67 int retval;
68
Al Viro3f7036a2015-03-08 19:28:30 -040069 retval = security_inode_getattr(path);
J. Bruce Fieldsb7a6ec52013-10-02 17:01:18 -040070 if (retval)
71 return retval;
72 return vfs_getattr_nosec(path, stat);
73}
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075EXPORT_SYMBOL(vfs_getattr);
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077int vfs_fstat(unsigned int fd, struct kstat *stat)
78{
Al Viro2903ff02012-08-28 12:52:22 -040079 struct fd f = fdget_raw(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 int error = -EBADF;
81
Al Viro2903ff02012-08-28 12:52:22 -040082 if (f.file) {
Al Viro3dadecc2013-01-24 02:18:08 -050083 error = vfs_getattr(&f.file->f_path, stat);
Al Viro2903ff02012-08-28 12:52:22 -040084 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
86 return error;
87}
Linus Torvalds1da177e2005-04-16 15:20:36 -070088EXPORT_SYMBOL(vfs_fstat);
89
David Howellsc7887322010-08-11 11:26:22 +010090int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
91 int flag)
Oleg Drokin0112fc22009-04-08 20:05:42 +040092{
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040093 struct path path;
Oleg Drokin0112fc22009-04-08 20:05:42 +040094 int error = -EINVAL;
Jeff Layton836fb7e2012-12-11 12:10:05 -050095 unsigned int lookup_flags = 0;
Oleg Drokin0112fc22009-04-08 20:05:42 +040096
Al Viro65cfc672011-03-13 15:56:26 -040097 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
98 AT_EMPTY_PATH)) != 0)
Oleg Drokin0112fc22009-04-08 20:05:42 +040099 goto out;
100
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400101 if (!(flag & AT_SYMLINK_NOFOLLOW))
102 lookup_flags |= LOOKUP_FOLLOW;
Al Viro65cfc672011-03-13 15:56:26 -0400103 if (flag & AT_EMPTY_PATH)
104 lookup_flags |= LOOKUP_EMPTY;
Jeff Layton836fb7e2012-12-11 12:10:05 -0500105retry:
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400106 error = user_path_at(dfd, filename, lookup_flags, &path);
107 if (error)
108 goto out;
109
Al Viro3dadecc2013-01-24 02:18:08 -0500110 error = vfs_getattr(&path, stat);
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400111 path_put(&path);
Jeff Layton836fb7e2012-12-11 12:10:05 -0500112 if (retry_estale(error, lookup_flags)) {
113 lookup_flags |= LOOKUP_REVAL;
114 goto retry;
115 }
Oleg Drokin0112fc22009-04-08 20:05:42 +0400116out:
117 return error;
118}
Oleg Drokin0112fc22009-04-08 20:05:42 +0400119EXPORT_SYMBOL(vfs_fstatat);
120
David Howellsc7887322010-08-11 11:26:22 +0100121int vfs_stat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400122{
123 return vfs_fstatat(AT_FDCWD, name, stat, 0);
124}
125EXPORT_SYMBOL(vfs_stat);
126
David Howellsc7887322010-08-11 11:26:22 +0100127int vfs_lstat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400128{
129 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
130}
131EXPORT_SYMBOL(vfs_lstat);
132
Oleg Drokin0112fc22009-04-08 20:05:42 +0400133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134#ifdef __ARCH_WANT_OLD_STAT
135
136/*
137 * For backward compatibility? Maybe this should be moved
138 * into arch/i386 instead?
139 */
140static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
141{
142 static int warncount = 5;
143 struct __old_kernel_stat tmp;
144
145 if (warncount > 0) {
146 warncount--;
147 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
148 current->comm);
149 } else if (warncount < 0) {
150 /* it's laughable, but... */
151 warncount = 0;
152 }
153
154 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
155 tmp.st_dev = old_encode_dev(stat->dev);
156 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700157 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
158 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 tmp.st_mode = stat->mode;
160 tmp.st_nlink = stat->nlink;
161 if (tmp.st_nlink != stat->nlink)
162 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800163 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
164 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 tmp.st_rdev = old_encode_dev(stat->rdev);
166#if BITS_PER_LONG == 32
167 if (stat->size > MAX_NON_LFS)
168 return -EOVERFLOW;
169#endif
170 tmp.st_size = stat->size;
171 tmp.st_atime = stat->atime.tv_sec;
172 tmp.st_mtime = stat->mtime.tv_sec;
173 tmp.st_ctime = stat->ctime.tv_sec;
174 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
175}
176
David Howellsc7887322010-08-11 11:26:22 +0100177SYSCALL_DEFINE2(stat, const char __user *, filename,
178 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179{
180 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400181 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400183 error = vfs_stat(filename, &stat);
184 if (error)
185 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400187 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188}
Heiko Carstens257ac262009-01-14 14:14:13 +0100189
David Howellsc7887322010-08-11 11:26:22 +0100190SYSCALL_DEFINE2(lstat, const char __user *, filename,
191 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400194 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400196 error = vfs_lstat(filename, &stat);
197 if (error)
198 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400200 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
Heiko Carstens257ac262009-01-14 14:14:13 +0100202
203SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 struct kstat stat;
206 int error = vfs_fstat(fd, &stat);
207
208 if (!error)
209 error = cp_old_stat(&stat, statbuf);
210
211 return error;
212}
213
214#endif /* __ARCH_WANT_OLD_STAT */
215
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700216#if BITS_PER_LONG == 32
217# define choose_32_64(a,b) a
218#else
219# define choose_32_64(a,b) b
220#endif
221
Yaowei Bai4c416f42016-01-15 16:58:01 -0800222#define valid_dev(x) choose_32_64(old_valid_dev(x),true)
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700223#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
224
Linus Torvalds8529f612012-05-06 18:02:40 -0700225#ifndef INIT_STRUCT_STAT_PADDING
226# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
227#endif
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
230{
231 struct stat tmp;
232
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700233 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 return -EOVERFLOW;
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700235#if BITS_PER_LONG == 32
236 if (stat->size > MAX_NON_LFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return -EOVERFLOW;
238#endif
239
Linus Torvalds8529f612012-05-06 18:02:40 -0700240 INIT_STRUCT_STAT_PADDING(tmp);
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700241 tmp.st_dev = encode_dev(stat->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700243 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
244 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 tmp.st_mode = stat->mode;
246 tmp.st_nlink = stat->nlink;
247 if (tmp.st_nlink != stat->nlink)
248 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800249 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
250 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700251 tmp.st_rdev = encode_dev(stat->rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 tmp.st_size = stat->size;
253 tmp.st_atime = stat->atime.tv_sec;
254 tmp.st_mtime = stat->mtime.tv_sec;
255 tmp.st_ctime = stat->ctime.tv_sec;
256#ifdef STAT_HAVE_NSEC
257 tmp.st_atime_nsec = stat->atime.tv_nsec;
258 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
259 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
260#endif
261 tmp.st_blocks = stat->blocks;
262 tmp.st_blksize = stat->blksize;
263 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
264}
265
David Howellsc7887322010-08-11 11:26:22 +0100266SYSCALL_DEFINE2(newstat, const char __user *, filename,
267 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
269 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400270 int error = vfs_stat(filename, &stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400272 if (error)
273 return error;
274 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800276
David Howellsc7887322010-08-11 11:26:22 +0100277SYSCALL_DEFINE2(newlstat, const char __user *, filename,
278 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
280 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400281 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400283 error = vfs_lstat(filename, &stat);
284 if (error)
285 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400287 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800289
Andreas Schwab2833c282006-04-27 15:46:42 +0200290#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
David Howellsc7887322010-08-11 11:26:22 +0100291SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100292 struct stat __user *, statbuf, int, flag)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800293{
294 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400295 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800296
Oleg Drokin0112fc22009-04-08 20:05:42 +0400297 error = vfs_fstatat(dfd, filename, &stat, flag);
298 if (error)
299 return error;
300 return cp_new_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800301}
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800302#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800303
Heiko Carstens257ac262009-01-14 14:14:13 +0100304SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305{
306 struct kstat stat;
307 int error = vfs_fstat(fd, &stat);
308
309 if (!error)
310 error = cp_new_stat(&stat, statbuf);
311
312 return error;
313}
314
Heiko Carstens6559eed82009-01-14 14:14:32 +0100315SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
316 char __user *, buf, int, bufsiz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Al Viro2d8f3032008-07-22 09:59:21 -0400318 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 int error;
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100320 int empty = 0;
Jeff Layton79551192012-12-11 12:10:06 -0500321 unsigned int lookup_flags = LOOKUP_EMPTY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
323 if (bufsiz <= 0)
324 return -EINVAL;
325
Jeff Layton79551192012-12-11 12:10:06 -0500326retry:
327 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 if (!error) {
David Howellsbb6687342015-03-17 22:26:21 +0000329 struct inode *inode = d_backing_inode(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100331 error = empty ? -ENOENT : -EINVAL;
Miklos Szeredifd4a0ed2016-12-09 16:45:04 +0100332 /*
333 * AFS mountpoints allow readlink(2) but are not symlinks
334 */
335 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
Al Viro2d8f3032008-07-22 09:59:21 -0400336 error = security_inode_readlink(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (!error) {
Al Viro68ac1232012-03-15 08:21:57 -0400338 touch_atime(&path);
Miklos Szeredifd4a0ed2016-12-09 16:45:04 +0100339 error = vfs_readlink(path.dentry, buf, bufsiz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 }
341 }
Al Viro2d8f3032008-07-22 09:59:21 -0400342 path_put(&path);
Jeff Layton79551192012-12-11 12:10:06 -0500343 if (retry_estale(error, lookup_flags)) {
344 lookup_flags |= LOOKUP_REVAL;
345 goto retry;
346 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
348 return error;
349}
350
Heiko Carstens002c8972009-01-14 14:14:18 +0100351SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
352 int, bufsiz)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800353{
354 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
355}
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358/* ---------- LFS-64 ----------- */
Catalin Marinas0753f702012-03-19 15:13:51 +0000359#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Linus Torvalds8529f612012-05-06 18:02:40 -0700361#ifndef INIT_STRUCT_STAT64_PADDING
362# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
363#endif
364
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
366{
367 struct stat64 tmp;
368
Linus Torvalds8529f612012-05-06 18:02:40 -0700369 INIT_STRUCT_STAT64_PADDING(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370#ifdef CONFIG_MIPS
371 /* mips has weird padding, so we don't get 64 bits there */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 tmp.st_dev = new_encode_dev(stat->dev);
373 tmp.st_rdev = new_encode_dev(stat->rdev);
374#else
375 tmp.st_dev = huge_encode_dev(stat->dev);
376 tmp.st_rdev = huge_encode_dev(stat->rdev);
377#endif
378 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700379 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
380 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381#ifdef STAT64_HAS_BROKEN_ST_INO
382 tmp.__st_ino = stat->ino;
383#endif
384 tmp.st_mode = stat->mode;
385 tmp.st_nlink = stat->nlink;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800386 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
387 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 tmp.st_atime = stat->atime.tv_sec;
389 tmp.st_atime_nsec = stat->atime.tv_nsec;
390 tmp.st_mtime = stat->mtime.tv_sec;
391 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
392 tmp.st_ctime = stat->ctime.tv_sec;
393 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
394 tmp.st_size = stat->size;
395 tmp.st_blocks = stat->blocks;
396 tmp.st_blksize = stat->blksize;
397 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
398}
399
David Howellsc7887322010-08-11 11:26:22 +0100400SYSCALL_DEFINE2(stat64, const char __user *, filename,
401 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402{
403 struct kstat stat;
404 int error = vfs_stat(filename, &stat);
405
406 if (!error)
407 error = cp_new_stat64(&stat, statbuf);
408
409 return error;
410}
Heiko Carstens257ac262009-01-14 14:14:13 +0100411
David Howellsc7887322010-08-11 11:26:22 +0100412SYSCALL_DEFINE2(lstat64, const char __user *, filename,
413 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
415 struct kstat stat;
416 int error = vfs_lstat(filename, &stat);
417
418 if (!error)
419 error = cp_new_stat64(&stat, statbuf);
420
421 return error;
422}
Heiko Carstens257ac262009-01-14 14:14:13 +0100423
424SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
426 struct kstat stat;
427 int error = vfs_fstat(fd, &stat);
428
429 if (!error)
430 error = cp_new_stat64(&stat, statbuf);
431
432 return error;
433}
434
David Howellsc7887322010-08-11 11:26:22 +0100435SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100436 struct stat64 __user *, statbuf, int, flag)
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800437{
438 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400439 int error;
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800440
Oleg Drokin0112fc22009-04-08 20:05:42 +0400441 error = vfs_fstatat(dfd, filename, &stat, flag);
442 if (error)
443 return error;
444 return cp_new_stat64(&stat, statbuf);
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800445}
Catalin Marinas0753f702012-03-19 15:13:51 +0000446#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300448/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
449void __inode_add_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 inode->i_blocks += bytes >> 9;
452 bytes &= 511;
453 inode->i_bytes += bytes;
454 if (inode->i_bytes >= 512) {
455 inode->i_blocks++;
456 inode->i_bytes -= 512;
457 }
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300458}
459
460void inode_add_bytes(struct inode *inode, loff_t bytes)
461{
462 spin_lock(&inode->i_lock);
463 __inode_add_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 spin_unlock(&inode->i_lock);
465}
466
467EXPORT_SYMBOL(inode_add_bytes);
468
Jan Kara1c8924e2013-08-17 09:32:32 -0400469void __inode_sub_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 inode->i_blocks -= bytes >> 9;
472 bytes &= 511;
473 if (inode->i_bytes < bytes) {
474 inode->i_blocks--;
475 inode->i_bytes += 512;
476 }
477 inode->i_bytes -= bytes;
Jan Kara1c8924e2013-08-17 09:32:32 -0400478}
479
480EXPORT_SYMBOL(__inode_sub_bytes);
481
482void inode_sub_bytes(struct inode *inode, loff_t bytes)
483{
484 spin_lock(&inode->i_lock);
485 __inode_sub_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 spin_unlock(&inode->i_lock);
487}
488
489EXPORT_SYMBOL(inode_sub_bytes);
490
491loff_t inode_get_bytes(struct inode *inode)
492{
493 loff_t ret;
494
495 spin_lock(&inode->i_lock);
496 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
497 spin_unlock(&inode->i_lock);
498 return ret;
499}
500
501EXPORT_SYMBOL(inode_get_bytes);
502
503void inode_set_bytes(struct inode *inode, loff_t bytes)
504{
505 /* Caller is here responsible for sufficient locking
506 * (ie. inode->i_lock) */
507 inode->i_blocks = bytes >> 9;
508 inode->i_bytes = bytes & 511;
509}
510
511EXPORT_SYMBOL(inode_set_bytes);