blob: 31acca5f5a0cd55152acae75f381f9337d8a9afa [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{
60 struct file *f = fget(fd);
61 int error = -EBADF;
62
63 if (f) {
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -080064 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 fput(f);
66 }
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;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040076 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;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040086
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);
Oleg Drokin0112fc22009-04-08 20:05:42 +040093out:
94 return error;
95}
Oleg Drokin0112fc22009-04-08 20:05:42 +040096EXPORT_SYMBOL(vfs_fstatat);
97
David Howellsc7887322010-08-11 11:26:22 +010098int vfs_stat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -040099{
100 return vfs_fstatat(AT_FDCWD, name, stat, 0);
101}
102EXPORT_SYMBOL(vfs_stat);
103
David Howellsc7887322010-08-11 11:26:22 +0100104int vfs_lstat(const char __user *name, struct kstat *stat)
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400105{
106 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
107}
108EXPORT_SYMBOL(vfs_lstat);
109
Oleg Drokin0112fc22009-04-08 20:05:42 +0400110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111#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;
David Howellsafefdbb2006-10-03 01:13:46 -0700134 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
135 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 tmp.st_mode = stat->mode;
137 tmp.st_nlink = stat->nlink;
138 if (tmp.st_nlink != stat->nlink)
139 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800140 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
141 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 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
David Howellsc7887322010-08-11 11:26:22 +0100154SYSCALL_DEFINE2(stat, const char __user *, filename,
155 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400158 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400160 error = vfs_stat(filename, &stat);
161 if (error)
162 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400164 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165}
Heiko Carstens257ac262009-01-14 14:14:13 +0100166
David Howellsc7887322010-08-11 11:26:22 +0100167SYSCALL_DEFINE2(lstat, const char __user *, filename,
168 struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
170 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400171 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400173 error = vfs_lstat(filename, &stat);
174 if (error)
175 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400177 return cp_old_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
Heiko Carstens257ac262009-01-14 14:14:13 +0100179
180SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
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;
David Howellsafefdbb2006-10-03 01:13:46 -0700212 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
213 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 tmp.st_mode = stat->mode;
215 tmp.st_nlink = stat->nlink;
216 if (tmp.st_nlink != stat->nlink)
217 return -EOVERFLOW;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800218 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
219 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220#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
David Howellsc7887322010-08-11 11:26:22 +0100243SYSCALL_DEFINE2(newstat, const char __user *, filename,
244 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400247 int error = vfs_stat(filename, &stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400249 if (error)
250 return error;
251 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800253
David Howellsc7887322010-08-11 11:26:22 +0100254SYSCALL_DEFINE2(newlstat, const char __user *, filename,
255 struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 struct kstat stat;
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400258 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400260 error = vfs_lstat(filename, &stat);
261 if (error)
262 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Christoph Hellwig2eae7a12009-04-08 16:34:03 -0400264 return cp_new_stat(&stat, statbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265}
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800266
Andreas Schwab2833c282006-04-27 15:46:42 +0200267#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
David Howellsc7887322010-08-11 11:26:22 +0100268SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100269 struct stat __user *, statbuf, int, flag)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800270{
271 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400272 int error;
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800273
Oleg Drokin0112fc22009-04-08 20:05:42 +0400274 error = vfs_fstatat(dfd, filename, &stat, flag);
275 if (error)
276 return error;
277 return cp_new_stat(&stat, statbuf);
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800278}
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800279#endif
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800280
Heiko Carstens257ac262009-01-14 14:14:13 +0100281SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
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
Heiko Carstens6559eed82009-01-14 14:14:32 +0100292SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
293 char __user *, buf, int, bufsiz)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
Al Viro2d8f3032008-07-22 09:59:21 -0400295 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 int error;
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100297 int empty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 if (bufsiz <= 0)
300 return -EINVAL;
301
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100302 error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 if (!error) {
Al Viro2d8f3032008-07-22 09:59:21 -0400304 struct inode *inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Andy Whitcroft1fa1e7f2011-11-02 09:44:39 +0100306 error = empty ? -ENOENT : -EINVAL;
Al Viroacfa4382008-12-04 10:06:33 -0500307 if (inode->i_op->readlink) {
Al Viro2d8f3032008-07-22 09:59:21 -0400308 error = security_inode_readlink(path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 if (!error) {
Al Viro68ac1232012-03-15 08:21:57 -0400310 touch_atime(&path);
Al Viro2d8f3032008-07-22 09:59:21 -0400311 error = inode->i_op->readlink(path.dentry,
Jan Blunck4ac91372008-02-14 19:34:32 -0800312 buf, bufsiz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 }
314 }
Al Viro2d8f3032008-07-22 09:59:21 -0400315 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317 return error;
318}
319
Heiko Carstens002c8972009-01-14 14:14:18 +0100320SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
321 int, bufsiz)
Ulrich Drepper5590ff02006-01-18 17:43:53 -0800322{
323 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
324}
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327/* ---------- LFS-64 ----------- */
328#ifdef __ARCH_WANT_STAT64
329
330static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
331{
332 struct stat64 tmp;
333
334 memset(&tmp, 0, sizeof(struct stat64));
335#ifdef CONFIG_MIPS
336 /* mips has weird padding, so we don't get 64 bits there */
337 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
338 return -EOVERFLOW;
339 tmp.st_dev = new_encode_dev(stat->dev);
340 tmp.st_rdev = new_encode_dev(stat->rdev);
341#else
342 tmp.st_dev = huge_encode_dev(stat->dev);
343 tmp.st_rdev = huge_encode_dev(stat->rdev);
344#endif
345 tmp.st_ino = stat->ino;
David Howellsafefdbb2006-10-03 01:13:46 -0700346 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
347 return -EOVERFLOW;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348#ifdef STAT64_HAS_BROKEN_ST_INO
349 tmp.__st_ino = stat->ino;
350#endif
351 tmp.st_mode = stat->mode;
352 tmp.st_nlink = stat->nlink;
Eric W. Biedermana7c19382012-02-09 09:10:30 -0800353 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
354 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 tmp.st_atime = stat->atime.tv_sec;
356 tmp.st_atime_nsec = stat->atime.tv_nsec;
357 tmp.st_mtime = stat->mtime.tv_sec;
358 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
359 tmp.st_ctime = stat->ctime.tv_sec;
360 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
361 tmp.st_size = stat->size;
362 tmp.st_blocks = stat->blocks;
363 tmp.st_blksize = stat->blksize;
364 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
365}
366
David Howellsc7887322010-08-11 11:26:22 +0100367SYSCALL_DEFINE2(stat64, const char __user *, filename,
368 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369{
370 struct kstat stat;
371 int error = vfs_stat(filename, &stat);
372
373 if (!error)
374 error = cp_new_stat64(&stat, statbuf);
375
376 return error;
377}
Heiko Carstens257ac262009-01-14 14:14:13 +0100378
David Howellsc7887322010-08-11 11:26:22 +0100379SYSCALL_DEFINE2(lstat64, const char __user *, filename,
380 struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
382 struct kstat stat;
383 int error = vfs_lstat(filename, &stat);
384
385 if (!error)
386 error = cp_new_stat64(&stat, statbuf);
387
388 return error;
389}
Heiko Carstens257ac262009-01-14 14:14:13 +0100390
391SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
393 struct kstat stat;
394 int error = vfs_fstat(fd, &stat);
395
396 if (!error)
397 error = cp_new_stat64(&stat, statbuf);
398
399 return error;
400}
401
David Howellsc7887322010-08-11 11:26:22 +0100402SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
Heiko Carstens6559eed82009-01-14 14:14:32 +0100403 struct stat64 __user *, statbuf, int, flag)
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800404{
405 struct kstat stat;
Oleg Drokin0112fc22009-04-08 20:05:42 +0400406 int error;
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800407
Oleg Drokin0112fc22009-04-08 20:05:42 +0400408 error = vfs_fstatat(dfd, filename, &stat, flag);
409 if (error)
410 return error;
411 return cp_new_stat64(&stat, statbuf);
Ulrich Dreppercff2b762006-02-11 17:55:47 -0800412}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413#endif /* __ARCH_WANT_STAT64 */
414
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300415/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
416void __inode_add_bytes(struct inode *inode, loff_t bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 inode->i_blocks += bytes >> 9;
419 bytes &= 511;
420 inode->i_bytes += bytes;
421 if (inode->i_bytes >= 512) {
422 inode->i_blocks++;
423 inode->i_bytes -= 512;
424 }
Dmitry Monakhovb4627072009-12-14 15:21:12 +0300425}
426
427void inode_add_bytes(struct inode *inode, loff_t bytes)
428{
429 spin_lock(&inode->i_lock);
430 __inode_add_bytes(inode, bytes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 spin_unlock(&inode->i_lock);
432}
433
434EXPORT_SYMBOL(inode_add_bytes);
435
436void inode_sub_bytes(struct inode *inode, loff_t bytes)
437{
438 spin_lock(&inode->i_lock);
439 inode->i_blocks -= bytes >> 9;
440 bytes &= 511;
441 if (inode->i_bytes < bytes) {
442 inode->i_blocks--;
443 inode->i_bytes += 512;
444 }
445 inode->i_bytes -= bytes;
446 spin_unlock(&inode->i_lock);
447}
448
449EXPORT_SYMBOL(inode_sub_bytes);
450
451loff_t inode_get_bytes(struct inode *inode)
452{
453 loff_t ret;
454
455 spin_lock(&inode->i_lock);
456 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
457 spin_unlock(&inode->i_lock);
458 return ret;
459}
460
461EXPORT_SYMBOL(inode_get_bytes);
462
463void inode_set_bytes(struct inode *inode, loff_t bytes)
464{
465 /* Caller is here responsible for sufficient locking
466 * (ie. inode->i_lock) */
467 inode->i_blocks = bytes >> 9;
468 inode->i_bytes = bytes & 511;
469}
470
471EXPORT_SYMBOL(inode_set_bytes);