blob: eae494630a36507e03defe8bdf836ee6b337b4ee [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
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);
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) {
64 error = vfs_getattr(f.file->f_path.mnt, f.file->f_path.dentry,
65 stat);
66 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 }
68 return error;
69}
Linus Torvalds1da177e2005-04-16 15:20:36 -070070EXPORT_SYMBOL(vfs_fstat);
71
David Howellsc7887322010-08-11 11:26:22 +010072int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
73 int flag)
Oleg Drokin0112fc22009-04-08 20:05:42 +040074{
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040075 struct path path;
Oleg Drokin0112fc22009-04-08 20:05:42 +040076 int error = -EINVAL;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040077 int lookup_flags = 0;
Oleg Drokin0112fc22009-04-08 20:05:42 +040078
Al Viro65cfc672011-03-13 15:56:26 -040079 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
80 AT_EMPTY_PATH)) != 0)
Oleg Drokin0112fc22009-04-08 20:05:42 +040081 goto out;
82
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040083 if (!(flag & AT_SYMLINK_NOFOLLOW))
84 lookup_flags |= LOOKUP_FOLLOW;
Al Viro65cfc672011-03-13 15:56:26 -040085 if (flag & AT_EMPTY_PATH)
86 lookup_flags |= LOOKUP_EMPTY;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040087
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);
Oleg Drokin0112fc22009-04-08 20:05:42 +040094out:
95 return error;
96}
Oleg Drokin0112fc22009-04-08 20:05:42 +040097EXPORT_SYMBOL(vfs_fstatat);
98
David Howellsc7887322010-08-11 11:26:22 +010099int vfs_stat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400100{
101 return vfs_fstatat(AT_FDCWD, name, stat, 0);
102}
103EXPORT_SYMBOL(vfs_stat);
104
David Howellsc7887322010-08-11 11:26:22 +0100105int vfs_lstat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400106{
107 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
108}
109EXPORT_SYMBOL(vfs_lstat);
110
Oleg Drokin0112fc22009-04-08 20:05:42 +0400111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112#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;
David Howellsafefdbb2006-10-03 01:13:46 -0700135 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
136 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 tmp.st_mode = stat->mode;
138 tmp.st_nlink = stat->nlink;
139 if (tmp.st_nlink != stat->nlink)
140 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800141 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 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
David Howellsc7887322010-08-11 11:26:22 +0100155SYSCALL_DEFINE2(stat, const char __user *, filename,
156 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400159 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400161 error = vfs_stat(filename, &stat);
162 if (error)
163 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400165 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166}
Heiko Carstens257ac262009-01-14 14:14:13 +0100167
David Howellsc7887322010-08-11 11:26:22 +0100168SYSCALL_DEFINE2(lstat, const char __user *, filename,
169 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400172 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400174 error = vfs_lstat(filename, &stat);
175 if (error)
176 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400178 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
Heiko Carstens257ac262009-01-14 14:14:13 +0100180
181SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
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
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700194#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
Linus Torvalds8529f6132012-05-06 18:02:40 -0700203#ifndef INIT_STRUCT_STAT_PADDING
204# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
205#endif
206
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
208{
209 struct stat tmp;
210
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700211 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 return -EOVERFLOW;
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700213#if BITS_PER_LONG == 32
214 if (stat->size > MAX_NON_LFS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 return -EOVERFLOW;
216#endif
217
Linus Torvalds8529f6132012-05-06 18:02:40 -0700218 INIT_STRUCT_STAT_PADDING(tmp);
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700219 tmp.st_dev = encode_dev(stat->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700221 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
222 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 tmp.st_mode = stat->mode;
224 tmp.st_nlink = stat->nlink;
225 if (tmp.st_nlink != stat->nlink)
226 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800227 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));
Linus Torvaldsa52dd972012-05-06 17:47:30 -0700229 tmp.st_rdev = encode_dev(stat->rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 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
David Howellsc7887322010-08-11 11:26:22 +0100244SYSCALL_DEFINE2(newstat, const char __user *, filename,
245 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400248 int error = vfs_stat(filename, &stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400250 if (error)
251 return error;
252 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800254
David Howellsc7887322010-08-11 11:26:22 +0100255SYSCALL_DEFINE2(newlstat, const char __user *, filename,
256 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
258 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400259 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400261 error = vfs_lstat(filename, &stat);
262 if (error)
263 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400265 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800267
Andreas Schwab2833c282006-04-27 15:46:42 +0200268#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
David Howellsc7887322010-08-11 11:26:22 +0100269SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100270 struct stat __user *, statbuf, int, flag)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800271{
272 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400273 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800274
Oleg Drokin0112fc22009-04-08 20:05:42 +0400275 error = vfs_fstatat(dfd, filename, &stat, flag);
276 if (error)
277 return error;
278 return cp_new_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800279}
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800280#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800281
Heiko Carstens257ac262009-01-14 14:14:13 +0100282SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
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
Heiko Carstens6559eed82009-01-14 14:14:32 +0100293SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
294 char __user *, buf, int, bufsiz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Al Viro2d8f3032008-07-22 09:59:21 -0400296 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 int error;
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100298 int empty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 if (bufsiz <= 0)
301 return -EINVAL;
302
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100303 error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (!error) {
Al Viro2d8f3032008-07-22 09:59:21 -0400305 struct inode *inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100307 error = empty ? -ENOENT : -EINVAL;
Al Viroacfa4382008-12-04 10:06:33 -0500308 if (inode->i_op->readlink) {
Al Viro2d8f3032008-07-22 09:59:21 -0400309 error = security_inode_readlink(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (!error) {
Al Viro68ac1232012-03-15 08:21:57 -0400311 touch_atime(&path);
Al Viro2d8f3032008-07-22 09:59:21 -0400312 error = inode->i_op->readlink(path.dentry,
Jan Blunck4ac91372008-02-14 19:34:32 -0800313 buf, bufsiz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 }
315 }
Al Viro2d8f3032008-07-22 09:59:21 -0400316 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 }
318 return error;
319}
320
Heiko Carstens002c8972009-01-14 14:14:18 +0100321SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
322 int, bufsiz)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800323{
324 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
325}
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328/* ---------- LFS-64 ----------- */
Catalin Marinas0753f702012-03-19 15:13:51 +0000329#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
Linus Torvalds8529f6132012-05-06 18:02:40 -0700331#ifndef INIT_STRUCT_STAT64_PADDING
332# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
333#endif
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
336{
337 struct stat64 tmp;
338
Linus Torvalds8529f6132012-05-06 18:02:40 -0700339 INIT_STRUCT_STAT64_PADDING(tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340#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;
David Howellsafefdbb2006-10-03 01:13:46 -0700351 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
352 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353#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;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800358 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
359 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 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
David Howellsc7887322010-08-11 11:26:22 +0100372SYSCALL_DEFINE2(stat64, const char __user *, filename,
373 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374{
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}
Heiko Carstens257ac262009-01-14 14:14:13 +0100383
David Howellsc7887322010-08-11 11:26:22 +0100384SYSCALL_DEFINE2(lstat64, const char __user *, filename,
385 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386{
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}
Heiko Carstens257ac262009-01-14 14:14:13 +0100395
396SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397{
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
David Howellsc7887322010-08-11 11:26:22 +0100407SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100408 struct stat64 __user *, statbuf, int, flag)
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800409{
410 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400411 int error;
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800412
Oleg Drokin0112fc22009-04-08 20:05:42 +0400413 error = vfs_fstatat(dfd, filename, &stat, flag);
414 if (error)
415 return error;
416 return cp_new_stat64(&stat, statbuf);
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800417}
Catalin Marinas0753f702012-03-19 15:13:51 +0000418#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300420/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
421void __inode_add_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 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 }
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300430}
431
432void inode_add_bytes(struct inode *inode, loff_t bytes)
433{
434 spin_lock(&inode->i_lock);
435 __inode_add_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 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);