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1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/export.h>
10 #include <linux/errno.h>
11 #include <linux/file.h>
12 #include <linux/highuid.h>
14 #include <linux/namei.h>
15 #include <linux/security.h>
16 #include <linux/cred.h>
17 #include <linux/syscalls.h>
18 #include <linux/pagemap.h>
19 #include <linux/compat.h>
21 #include <linux/uaccess.h>
22 #include <asm/unistd.h>
25 * generic_fillattr - Fill in the basic attributes from the inode struct
26 * @inode: Inode to use as the source
27 * @stat: Where to fill in the attributes
29 * Fill in the basic attributes in the kstat structure from data that's to be
30 * found on the VFS inode structure. This is the default if no getattr inode
31 * operation is supplied.
33 void generic_fillattr(struct inode
*inode
, struct kstat
*stat
)
35 stat
->dev
= inode
->i_sb
->s_dev
;
36 stat
->ino
= inode
->i_ino
;
37 stat
->mode
= inode
->i_mode
;
38 stat
->nlink
= inode
->i_nlink
;
39 stat
->uid
= inode
->i_uid
;
40 stat
->gid
= inode
->i_gid
;
41 stat
->rdev
= inode
->i_rdev
;
42 stat
->size
= i_size_read(inode
);
43 stat
->atime
= inode
->i_atime
;
44 stat
->mtime
= inode
->i_mtime
;
45 stat
->ctime
= inode
->i_ctime
;
46 stat
->blksize
= i_blocksize(inode
);
47 stat
->blocks
= inode
->i_blocks
;
49 if (IS_NOATIME(inode
))
50 stat
->result_mask
&= ~STATX_ATIME
;
51 if (IS_AUTOMOUNT(inode
))
52 stat
->attributes
|= STATX_ATTR_AUTOMOUNT
;
54 EXPORT_SYMBOL(generic_fillattr
);
57 * vfs_getattr_nosec - getattr without security checks
58 * @path: file to get attributes from
59 * @stat: structure to return attributes in
60 * @request_mask: STATX_xxx flags indicating what the caller wants
61 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
63 * Get attributes without calling security_inode_getattr.
65 * Currently the only caller other than vfs_getattr is internal to the
66 * filehandle lookup code, which uses only the inode number and returns no
67 * attributes to any user. Any other code probably wants vfs_getattr.
69 int vfs_getattr_nosec(const struct path
*path
, struct kstat
*stat
,
70 u32 request_mask
, unsigned int query_flags
)
72 struct inode
*inode
= d_backing_inode(path
->dentry
);
74 memset(stat
, 0, sizeof(*stat
));
75 stat
->result_mask
|= STATX_BASIC_STATS
;
76 request_mask
&= STATX_ALL
;
77 query_flags
&= KSTAT_QUERY_FLAGS
;
78 if (inode
->i_op
->getattr
)
79 return inode
->i_op
->getattr(path
, stat
, request_mask
,
82 generic_fillattr(inode
, stat
);
85 EXPORT_SYMBOL(vfs_getattr_nosec
);
88 * vfs_getattr - Get the enhanced basic attributes of a file
89 * @path: The file of interest
90 * @stat: Where to return the statistics
91 * @request_mask: STATX_xxx flags indicating what the caller wants
92 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
94 * Ask the filesystem for a file's attributes. The caller must indicate in
95 * request_mask and query_flags to indicate what they want.
97 * If the file is remote, the filesystem can be forced to update the attributes
98 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
99 * suppress the update by passing AT_STATX_DONT_SYNC.
101 * Bits must have been set in request_mask to indicate which attributes the
102 * caller wants retrieving. Any such attribute not requested may be returned
103 * anyway, but the value may be approximate, and, if remote, may not have been
104 * synchronised with the server.
106 * 0 will be returned on success, and a -ve error code if unsuccessful.
108 int vfs_getattr(const struct path
*path
, struct kstat
*stat
,
109 u32 request_mask
, unsigned int query_flags
)
113 retval
= security_inode_getattr(path
);
116 return vfs_getattr_nosec(path
, stat
, request_mask
, query_flags
);
118 EXPORT_SYMBOL(vfs_getattr
);
121 * vfs_statx_fd - Get the enhanced basic attributes by file descriptor
122 * @fd: The file descriptor referring to the file of interest
123 * @stat: The result structure to fill in.
124 * @request_mask: STATX_xxx flags indicating what the caller wants
125 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
127 * This function is a wrapper around vfs_getattr(). The main difference is
128 * that it uses a file descriptor to determine the file location.
130 * 0 will be returned on success, and a -ve error code if unsuccessful.
132 int vfs_statx_fd(unsigned int fd
, struct kstat
*stat
,
133 u32 request_mask
, unsigned int query_flags
)
138 if (query_flags
& ~KSTAT_QUERY_FLAGS
)
143 error
= vfs_getattr(&f
.file
->f_path
, stat
,
144 request_mask
, query_flags
);
149 EXPORT_SYMBOL(vfs_statx_fd
);
152 * vfs_statx - Get basic and extra attributes by filename
153 * @dfd: A file descriptor representing the base dir for a relative filename
154 * @filename: The name of the file of interest
155 * @flags: Flags to control the query
156 * @stat: The result structure to fill in.
157 * @request_mask: STATX_xxx flags indicating what the caller wants
159 * This function is a wrapper around vfs_getattr(). The main difference is
160 * that it uses a filename and base directory to determine the file location.
161 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
162 * at the given name from being referenced.
164 * 0 will be returned on success, and a -ve error code if unsuccessful.
166 int vfs_statx(int dfd
, const char __user
*filename
, int flags
,
167 struct kstat
*stat
, u32 request_mask
)
171 unsigned int lookup_flags
= LOOKUP_FOLLOW
| LOOKUP_AUTOMOUNT
;
173 if ((flags
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
|
174 AT_EMPTY_PATH
| KSTAT_QUERY_FLAGS
)) != 0)
177 if (flags
& AT_SYMLINK_NOFOLLOW
)
178 lookup_flags
&= ~LOOKUP_FOLLOW
;
179 if (flags
& AT_NO_AUTOMOUNT
)
180 lookup_flags
&= ~LOOKUP_AUTOMOUNT
;
181 if (flags
& AT_EMPTY_PATH
)
182 lookup_flags
|= LOOKUP_EMPTY
;
185 error
= user_path_at(dfd
, filename
, lookup_flags
, &path
);
189 error
= vfs_getattr(&path
, stat
, request_mask
, flags
);
191 if (retry_estale(error
, lookup_flags
)) {
192 lookup_flags
|= LOOKUP_REVAL
;
198 EXPORT_SYMBOL(vfs_statx
);
201 #ifdef __ARCH_WANT_OLD_STAT
204 * For backward compatibility? Maybe this should be moved
205 * into arch/i386 instead?
207 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
209 static int warncount
= 5;
210 struct __old_kernel_stat tmp
;
214 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
216 } else if (warncount
< 0) {
217 /* it's laughable, but... */
221 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
222 tmp
.st_dev
= old_encode_dev(stat
->dev
);
223 tmp
.st_ino
= stat
->ino
;
224 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
226 tmp
.st_mode
= stat
->mode
;
227 tmp
.st_nlink
= stat
->nlink
;
228 if (tmp
.st_nlink
!= stat
->nlink
)
230 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
));
232 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
233 #if BITS_PER_LONG == 32
234 if (stat
->size
> MAX_NON_LFS
)
237 tmp
.st_size
= stat
->size
;
238 tmp
.st_atime
= stat
->atime
.tv_sec
;
239 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
240 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
241 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
244 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
245 struct __old_kernel_stat __user
*, statbuf
)
250 error
= vfs_stat(filename
, &stat
);
254 return cp_old_stat(&stat
, statbuf
);
257 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
258 struct __old_kernel_stat __user
*, statbuf
)
263 error
= vfs_lstat(filename
, &stat
);
267 return cp_old_stat(&stat
, statbuf
);
270 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
273 int error
= vfs_fstat(fd
, &stat
);
276 error
= cp_old_stat(&stat
, statbuf
);
281 #endif /* __ARCH_WANT_OLD_STAT */
283 #ifdef __ARCH_WANT_NEW_STAT
285 #if BITS_PER_LONG == 32
286 # define choose_32_64(a,b) a
288 # define choose_32_64(a,b) b
291 #define valid_dev(x) choose_32_64(old_valid_dev(x),true)
292 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
294 #ifndef INIT_STRUCT_STAT_PADDING
295 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
298 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
302 if (!valid_dev(stat
->dev
) || !valid_dev(stat
->rdev
))
304 #if BITS_PER_LONG == 32
305 if (stat
->size
> MAX_NON_LFS
)
309 INIT_STRUCT_STAT_PADDING(tmp
);
310 tmp
.st_dev
= encode_dev(stat
->dev
);
311 tmp
.st_ino
= stat
->ino
;
312 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
314 tmp
.st_mode
= stat
->mode
;
315 tmp
.st_nlink
= stat
->nlink
;
316 if (tmp
.st_nlink
!= stat
->nlink
)
318 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
319 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
320 tmp
.st_rdev
= encode_dev(stat
->rdev
);
321 tmp
.st_size
= stat
->size
;
322 tmp
.st_atime
= stat
->atime
.tv_sec
;
323 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
324 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
325 #ifdef STAT_HAVE_NSEC
326 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
327 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
328 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
330 tmp
.st_blocks
= stat
->blocks
;
331 tmp
.st_blksize
= stat
->blksize
;
332 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
335 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
336 struct stat __user
*, statbuf
)
339 int error
= vfs_stat(filename
, &stat
);
343 return cp_new_stat(&stat
, statbuf
);
346 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
347 struct stat __user
*, statbuf
)
352 error
= vfs_lstat(filename
, &stat
);
356 return cp_new_stat(&stat
, statbuf
);
359 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
360 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
361 struct stat __user
*, statbuf
, int, flag
)
366 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
369 return cp_new_stat(&stat
, statbuf
);
373 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
376 int error
= vfs_fstat(fd
, &stat
);
379 error
= cp_new_stat(&stat
, statbuf
);
385 static int do_readlinkat(int dfd
, const char __user
*pathname
,
386 char __user
*buf
, int bufsiz
)
391 unsigned int lookup_flags
= LOOKUP_EMPTY
;
397 error
= user_path_at_empty(dfd
, pathname
, lookup_flags
, &path
, &empty
);
399 struct inode
*inode
= d_backing_inode(path
.dentry
);
401 error
= empty
? -ENOENT
: -EINVAL
;
403 * AFS mountpoints allow readlink(2) but are not symlinks
405 if (d_is_symlink(path
.dentry
) || inode
->i_op
->readlink
) {
406 error
= security_inode_readlink(path
.dentry
);
409 error
= vfs_readlink(path
.dentry
, buf
, bufsiz
);
413 if (retry_estale(error
, lookup_flags
)) {
414 lookup_flags
|= LOOKUP_REVAL
;
421 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
422 char __user
*, buf
, int, bufsiz
)
424 return do_readlinkat(dfd
, pathname
, buf
, bufsiz
);
427 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
430 return do_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
434 /* ---------- LFS-64 ----------- */
435 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
437 #ifndef INIT_STRUCT_STAT64_PADDING
438 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
441 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
445 INIT_STRUCT_STAT64_PADDING(tmp
);
447 /* mips has weird padding, so we don't get 64 bits there */
448 tmp
.st_dev
= new_encode_dev(stat
->dev
);
449 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
451 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
452 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
454 tmp
.st_ino
= stat
->ino
;
455 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
457 #ifdef STAT64_HAS_BROKEN_ST_INO
458 tmp
.__st_ino
= stat
->ino
;
460 tmp
.st_mode
= stat
->mode
;
461 tmp
.st_nlink
= stat
->nlink
;
462 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
463 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
464 tmp
.st_atime
= stat
->atime
.tv_sec
;
465 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
466 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
467 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
468 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
469 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
470 tmp
.st_size
= stat
->size
;
471 tmp
.st_blocks
= stat
->blocks
;
472 tmp
.st_blksize
= stat
->blksize
;
473 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
476 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
477 struct stat64 __user
*, statbuf
)
480 int error
= vfs_stat(filename
, &stat
);
483 error
= cp_new_stat64(&stat
, statbuf
);
488 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
489 struct stat64 __user
*, statbuf
)
492 int error
= vfs_lstat(filename
, &stat
);
495 error
= cp_new_stat64(&stat
, statbuf
);
500 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
503 int error
= vfs_fstat(fd
, &stat
);
506 error
= cp_new_stat64(&stat
, statbuf
);
511 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
512 struct stat64 __user
*, statbuf
, int, flag
)
517 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
520 return cp_new_stat64(&stat
, statbuf
);
522 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
524 static noinline_for_stack
int
525 cp_statx(const struct kstat
*stat
, struct statx __user
*buffer
)
529 memset(&tmp
, 0, sizeof(tmp
));
531 tmp
.stx_mask
= stat
->result_mask
;
532 tmp
.stx_blksize
= stat
->blksize
;
533 tmp
.stx_attributes
= stat
->attributes
;
534 tmp
.stx_nlink
= stat
->nlink
;
535 tmp
.stx_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
536 tmp
.stx_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
537 tmp
.stx_mode
= stat
->mode
;
538 tmp
.stx_ino
= stat
->ino
;
539 tmp
.stx_size
= stat
->size
;
540 tmp
.stx_blocks
= stat
->blocks
;
541 tmp
.stx_attributes_mask
= stat
->attributes_mask
;
542 tmp
.stx_atime
.tv_sec
= stat
->atime
.tv_sec
;
543 tmp
.stx_atime
.tv_nsec
= stat
->atime
.tv_nsec
;
544 tmp
.stx_btime
.tv_sec
= stat
->btime
.tv_sec
;
545 tmp
.stx_btime
.tv_nsec
= stat
->btime
.tv_nsec
;
546 tmp
.stx_ctime
.tv_sec
= stat
->ctime
.tv_sec
;
547 tmp
.stx_ctime
.tv_nsec
= stat
->ctime
.tv_nsec
;
548 tmp
.stx_mtime
.tv_sec
= stat
->mtime
.tv_sec
;
549 tmp
.stx_mtime
.tv_nsec
= stat
->mtime
.tv_nsec
;
550 tmp
.stx_rdev_major
= MAJOR(stat
->rdev
);
551 tmp
.stx_rdev_minor
= MINOR(stat
->rdev
);
552 tmp
.stx_dev_major
= MAJOR(stat
->dev
);
553 tmp
.stx_dev_minor
= MINOR(stat
->dev
);
555 return copy_to_user(buffer
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
559 * sys_statx - System call to get enhanced stats
560 * @dfd: Base directory to pathwalk from *or* fd to stat.
561 * @filename: File to stat or "" with AT_EMPTY_PATH
562 * @flags: AT_* flags to control pathwalk.
563 * @mask: Parts of statx struct actually required.
564 * @buffer: Result buffer.
566 * Note that fstat() can be emulated by setting dfd to the fd of interest,
567 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
569 SYSCALL_DEFINE5(statx
,
570 int, dfd
, const char __user
*, filename
, unsigned, flags
,
572 struct statx __user
*, buffer
)
577 if (mask
& STATX__RESERVED
)
579 if ((flags
& AT_STATX_SYNC_TYPE
) == AT_STATX_SYNC_TYPE
)
582 error
= vfs_statx(dfd
, filename
, flags
, &stat
, mask
);
586 return cp_statx(&stat
, buffer
);
590 static int cp_compat_stat(struct kstat
*stat
, struct compat_stat __user
*ubuf
)
592 struct compat_stat tmp
;
594 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
597 memset(&tmp
, 0, sizeof(tmp
));
598 tmp
.st_dev
= old_encode_dev(stat
->dev
);
599 tmp
.st_ino
= stat
->ino
;
600 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
602 tmp
.st_mode
= stat
->mode
;
603 tmp
.st_nlink
= stat
->nlink
;
604 if (tmp
.st_nlink
!= stat
->nlink
)
606 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
607 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
608 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
609 if ((u64
) stat
->size
> MAX_NON_LFS
)
611 tmp
.st_size
= stat
->size
;
612 tmp
.st_atime
= stat
->atime
.tv_sec
;
613 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
614 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
615 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
616 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
617 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
618 tmp
.st_blocks
= stat
->blocks
;
619 tmp
.st_blksize
= stat
->blksize
;
620 return copy_to_user(ubuf
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
623 COMPAT_SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
624 struct compat_stat __user
*, statbuf
)
629 error
= vfs_stat(filename
, &stat
);
632 return cp_compat_stat(&stat
, statbuf
);
635 COMPAT_SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
636 struct compat_stat __user
*, statbuf
)
641 error
= vfs_lstat(filename
, &stat
);
644 return cp_compat_stat(&stat
, statbuf
);
647 #ifndef __ARCH_WANT_STAT64
648 COMPAT_SYSCALL_DEFINE4(newfstatat
, unsigned int, dfd
,
649 const char __user
*, filename
,
650 struct compat_stat __user
*, statbuf
, int, flag
)
655 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
658 return cp_compat_stat(&stat
, statbuf
);
662 COMPAT_SYSCALL_DEFINE2(newfstat
, unsigned int, fd
,
663 struct compat_stat __user
*, statbuf
)
666 int error
= vfs_fstat(fd
, &stat
);
669 error
= cp_compat_stat(&stat
, statbuf
);
674 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
675 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
677 inode
->i_blocks
+= bytes
>> 9;
679 inode
->i_bytes
+= bytes
;
680 if (inode
->i_bytes
>= 512) {
682 inode
->i_bytes
-= 512;
685 EXPORT_SYMBOL(__inode_add_bytes
);
687 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
689 spin_lock(&inode
->i_lock
);
690 __inode_add_bytes(inode
, bytes
);
691 spin_unlock(&inode
->i_lock
);
694 EXPORT_SYMBOL(inode_add_bytes
);
696 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
698 inode
->i_blocks
-= bytes
>> 9;
700 if (inode
->i_bytes
< bytes
) {
702 inode
->i_bytes
+= 512;
704 inode
->i_bytes
-= bytes
;
707 EXPORT_SYMBOL(__inode_sub_bytes
);
709 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
711 spin_lock(&inode
->i_lock
);
712 __inode_sub_bytes(inode
, bytes
);
713 spin_unlock(&inode
->i_lock
);
716 EXPORT_SYMBOL(inode_sub_bytes
);
718 loff_t
inode_get_bytes(struct inode
*inode
)
722 spin_lock(&inode
->i_lock
);
723 ret
= __inode_get_bytes(inode
);
724 spin_unlock(&inode
->i_lock
);
728 EXPORT_SYMBOL(inode_get_bytes
);
730 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
732 /* Caller is here responsible for sufficient locking
733 * (ie. inode->i_lock) */
734 inode
->i_blocks
= bytes
>> 9;
735 inode
->i_bytes
= bytes
& 511;
738 EXPORT_SYMBOL(inode_set_bytes
);