]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - fs/stat.c
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>
28 * generic_fillattr - Fill in the basic attributes from the inode struct
29 * @mnt_userns: user namespace of the mount the inode was found from
30 * @inode: Inode to use as the source
31 * @stat: Where to fill in the attributes
33 * Fill in the basic attributes in the kstat structure from data that's to be
34 * found on the VFS inode structure. This is the default if no getattr inode
35 * operation is supplied.
37 * If the inode has been found through an idmapped mount the user namespace of
38 * the vfsmount must be passed through @mnt_userns. This function will then
39 * take care to map the inode according to @mnt_userns before filling in the
40 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
41 * performed on the raw inode simply passs init_user_ns.
43 void generic_fillattr(struct user_namespace
*mnt_userns
, struct inode
*inode
,
46 stat
->dev
= inode
->i_sb
->s_dev
;
47 stat
->ino
= inode
->i_ino
;
48 stat
->mode
= inode
->i_mode
;
49 stat
->nlink
= inode
->i_nlink
;
50 stat
->uid
= i_uid_into_mnt(mnt_userns
, inode
);
51 stat
->gid
= i_gid_into_mnt(mnt_userns
, inode
);
52 stat
->rdev
= inode
->i_rdev
;
53 stat
->size
= i_size_read(inode
);
54 stat
->atime
= inode
->i_atime
;
55 stat
->mtime
= inode
->i_mtime
;
56 stat
->ctime
= inode
->i_ctime
;
57 stat
->blksize
= i_blocksize(inode
);
58 stat
->blocks
= inode
->i_blocks
;
60 EXPORT_SYMBOL(generic_fillattr
);
63 * vfs_getattr_nosec - getattr without security checks
64 * @path: file to get attributes from
65 * @stat: structure to return attributes in
66 * @request_mask: STATX_xxx flags indicating what the caller wants
67 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
69 * Get attributes without calling security_inode_getattr.
71 * Currently the only caller other than vfs_getattr is internal to the
72 * filehandle lookup code, which uses only the inode number and returns no
73 * attributes to any user. Any other code probably wants vfs_getattr.
75 int vfs_getattr_nosec(const struct path
*path
, struct kstat
*stat
,
76 u32 request_mask
, unsigned int query_flags
)
78 struct user_namespace
*mnt_userns
;
79 struct inode
*inode
= d_backing_inode(path
->dentry
);
81 memset(stat
, 0, sizeof(*stat
));
82 stat
->result_mask
|= STATX_BASIC_STATS
;
83 query_flags
&= AT_STATX_SYNC_TYPE
;
85 /* allow the fs to override these if it really wants to */
86 /* SB_NOATIME means filesystem supplies dummy atime value */
87 if (inode
->i_sb
->s_flags
& SB_NOATIME
)
88 stat
->result_mask
&= ~STATX_ATIME
;
91 * Note: If you add another clause to set an attribute flag, please
92 * update attributes_mask below.
94 if (IS_AUTOMOUNT(inode
))
95 stat
->attributes
|= STATX_ATTR_AUTOMOUNT
;
98 stat
->attributes
|= STATX_ATTR_DAX
;
100 stat
->attributes_mask
|= (STATX_ATTR_AUTOMOUNT
|
103 mnt_userns
= mnt_user_ns(path
->mnt
);
104 if (inode
->i_op
->getattr
)
105 return inode
->i_op
->getattr(mnt_userns
, path
, stat
,
106 request_mask
, query_flags
);
108 generic_fillattr(mnt_userns
, inode
, stat
);
111 EXPORT_SYMBOL(vfs_getattr_nosec
);
114 * vfs_getattr - Get the enhanced basic attributes of a file
115 * @path: The file of interest
116 * @stat: Where to return the statistics
117 * @request_mask: STATX_xxx flags indicating what the caller wants
118 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
120 * Ask the filesystem for a file's attributes. The caller must indicate in
121 * request_mask and query_flags to indicate what they want.
123 * If the file is remote, the filesystem can be forced to update the attributes
124 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
125 * suppress the update by passing AT_STATX_DONT_SYNC.
127 * Bits must have been set in request_mask to indicate which attributes the
128 * caller wants retrieving. Any such attribute not requested may be returned
129 * anyway, but the value may be approximate, and, if remote, may not have been
130 * synchronised with the server.
132 * 0 will be returned on success, and a -ve error code if unsuccessful.
134 int vfs_getattr(const struct path
*path
, struct kstat
*stat
,
135 u32 request_mask
, unsigned int query_flags
)
139 retval
= security_inode_getattr(path
);
142 return vfs_getattr_nosec(path
, stat
, request_mask
, query_flags
);
144 EXPORT_SYMBOL(vfs_getattr
);
147 * vfs_fstat - Get the basic attributes by file descriptor
148 * @fd: The file descriptor referring to the file of interest
149 * @stat: The result structure to fill in.
151 * This function is a wrapper around vfs_getattr(). The main difference is
152 * that it uses a file descriptor to determine the file location.
154 * 0 will be returned on success, and a -ve error code if unsuccessful.
156 int vfs_fstat(int fd
, struct kstat
*stat
)
164 error
= vfs_getattr(&f
.file
->f_path
, stat
, STATX_BASIC_STATS
, 0);
170 * vfs_statx - Get basic and extra attributes by filename
171 * @dfd: A file descriptor representing the base dir for a relative filename
172 * @filename: The name of the file of interest
173 * @flags: Flags to control the query
174 * @stat: The result structure to fill in.
175 * @request_mask: STATX_xxx flags indicating what the caller wants
177 * This function is a wrapper around vfs_getattr(). The main difference is
178 * that it uses a filename and base directory to determine the file location.
179 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
180 * at the given name from being referenced.
182 * 0 will be returned on success, and a -ve error code if unsuccessful.
184 static int vfs_statx(int dfd
, const char __user
*filename
, int flags
,
185 struct kstat
*stat
, u32 request_mask
)
188 unsigned lookup_flags
= 0;
191 if (flags
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
| AT_EMPTY_PATH
|
195 if (!(flags
& AT_SYMLINK_NOFOLLOW
))
196 lookup_flags
|= LOOKUP_FOLLOW
;
197 if (!(flags
& AT_NO_AUTOMOUNT
))
198 lookup_flags
|= LOOKUP_AUTOMOUNT
;
199 if (flags
& AT_EMPTY_PATH
)
200 lookup_flags
|= LOOKUP_EMPTY
;
203 error
= user_path_at(dfd
, filename
, lookup_flags
, &path
);
207 error
= vfs_getattr(&path
, stat
, request_mask
, flags
);
208 stat
->mnt_id
= real_mount(path
.mnt
)->mnt_id
;
209 stat
->result_mask
|= STATX_MNT_ID
;
210 if (path
.mnt
->mnt_root
== path
.dentry
)
211 stat
->attributes
|= STATX_ATTR_MOUNT_ROOT
;
212 stat
->attributes_mask
|= STATX_ATTR_MOUNT_ROOT
;
214 if (retry_estale(error
, lookup_flags
)) {
215 lookup_flags
|= LOOKUP_REVAL
;
222 int vfs_fstatat(int dfd
, const char __user
*filename
,
223 struct kstat
*stat
, int flags
)
225 return vfs_statx(dfd
, filename
, flags
| AT_NO_AUTOMOUNT
,
226 stat
, STATX_BASIC_STATS
);
229 #ifdef __ARCH_WANT_OLD_STAT
232 * For backward compatibility? Maybe this should be moved
233 * into arch/i386 instead?
235 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
237 static int warncount
= 5;
238 struct __old_kernel_stat tmp
;
242 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
244 } else if (warncount
< 0) {
245 /* it's laughable, but... */
249 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
250 tmp
.st_dev
= old_encode_dev(stat
->dev
);
251 tmp
.st_ino
= stat
->ino
;
252 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
254 tmp
.st_mode
= stat
->mode
;
255 tmp
.st_nlink
= stat
->nlink
;
256 if (tmp
.st_nlink
!= stat
->nlink
)
258 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
259 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
260 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
261 #if BITS_PER_LONG == 32
262 if (stat
->size
> MAX_NON_LFS
)
265 tmp
.st_size
= stat
->size
;
266 tmp
.st_atime
= stat
->atime
.tv_sec
;
267 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
268 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
269 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
272 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
273 struct __old_kernel_stat __user
*, statbuf
)
278 error
= vfs_stat(filename
, &stat
);
282 return cp_old_stat(&stat
, statbuf
);
285 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
286 struct __old_kernel_stat __user
*, statbuf
)
291 error
= vfs_lstat(filename
, &stat
);
295 return cp_old_stat(&stat
, statbuf
);
298 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
301 int error
= vfs_fstat(fd
, &stat
);
304 error
= cp_old_stat(&stat
, statbuf
);
309 #endif /* __ARCH_WANT_OLD_STAT */
311 #ifdef __ARCH_WANT_NEW_STAT
313 #if BITS_PER_LONG == 32
314 # define choose_32_64(a,b) a
316 # define choose_32_64(a,b) b
319 #define valid_dev(x) choose_32_64(old_valid_dev(x),true)
320 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
322 #ifndef INIT_STRUCT_STAT_PADDING
323 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
326 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
330 if (!valid_dev(stat
->dev
) || !valid_dev(stat
->rdev
))
332 #if BITS_PER_LONG == 32
333 if (stat
->size
> MAX_NON_LFS
)
337 INIT_STRUCT_STAT_PADDING(tmp
);
338 tmp
.st_dev
= encode_dev(stat
->dev
);
339 tmp
.st_ino
= stat
->ino
;
340 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
342 tmp
.st_mode
= stat
->mode
;
343 tmp
.st_nlink
= stat
->nlink
;
344 if (tmp
.st_nlink
!= stat
->nlink
)
346 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
347 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
348 tmp
.st_rdev
= encode_dev(stat
->rdev
);
349 tmp
.st_size
= stat
->size
;
350 tmp
.st_atime
= stat
->atime
.tv_sec
;
351 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
352 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
353 #ifdef STAT_HAVE_NSEC
354 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
355 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
356 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
358 tmp
.st_blocks
= stat
->blocks
;
359 tmp
.st_blksize
= stat
->blksize
;
360 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
363 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
364 struct stat __user
*, statbuf
)
367 int error
= vfs_stat(filename
, &stat
);
371 return cp_new_stat(&stat
, statbuf
);
374 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
375 struct stat __user
*, statbuf
)
380 error
= vfs_lstat(filename
, &stat
);
384 return cp_new_stat(&stat
, statbuf
);
387 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
388 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
389 struct stat __user
*, statbuf
, int, flag
)
394 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
397 return cp_new_stat(&stat
, statbuf
);
401 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
404 int error
= vfs_fstat(fd
, &stat
);
407 error
= cp_new_stat(&stat
, statbuf
);
413 static int do_readlinkat(int dfd
, const char __user
*pathname
,
414 char __user
*buf
, int bufsiz
)
419 unsigned int lookup_flags
= LOOKUP_EMPTY
;
425 error
= user_path_at_empty(dfd
, pathname
, lookup_flags
, &path
, &empty
);
427 struct inode
*inode
= d_backing_inode(path
.dentry
);
429 error
= empty
? -ENOENT
: -EINVAL
;
431 * AFS mountpoints allow readlink(2) but are not symlinks
433 if (d_is_symlink(path
.dentry
) || inode
->i_op
->readlink
) {
434 error
= security_inode_readlink(path
.dentry
);
437 error
= vfs_readlink(path
.dentry
, buf
, bufsiz
);
441 if (retry_estale(error
, lookup_flags
)) {
442 lookup_flags
|= LOOKUP_REVAL
;
449 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
450 char __user
*, buf
, int, bufsiz
)
452 return do_readlinkat(dfd
, pathname
, buf
, bufsiz
);
455 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
458 return do_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
462 /* ---------- LFS-64 ----------- */
463 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
465 #ifndef INIT_STRUCT_STAT64_PADDING
466 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
469 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
473 INIT_STRUCT_STAT64_PADDING(tmp
);
475 /* mips has weird padding, so we don't get 64 bits there */
476 tmp
.st_dev
= new_encode_dev(stat
->dev
);
477 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
479 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
480 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
482 tmp
.st_ino
= stat
->ino
;
483 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
485 #ifdef STAT64_HAS_BROKEN_ST_INO
486 tmp
.__st_ino
= stat
->ino
;
488 tmp
.st_mode
= stat
->mode
;
489 tmp
.st_nlink
= stat
->nlink
;
490 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
491 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
492 tmp
.st_atime
= stat
->atime
.tv_sec
;
493 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
494 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
495 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
496 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
497 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
498 tmp
.st_size
= stat
->size
;
499 tmp
.st_blocks
= stat
->blocks
;
500 tmp
.st_blksize
= stat
->blksize
;
501 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
504 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
505 struct stat64 __user
*, statbuf
)
508 int error
= vfs_stat(filename
, &stat
);
511 error
= cp_new_stat64(&stat
, statbuf
);
516 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
517 struct stat64 __user
*, statbuf
)
520 int error
= vfs_lstat(filename
, &stat
);
523 error
= cp_new_stat64(&stat
, statbuf
);
528 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
531 int error
= vfs_fstat(fd
, &stat
);
534 error
= cp_new_stat64(&stat
, statbuf
);
539 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
540 struct stat64 __user
*, statbuf
, int, flag
)
545 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
548 return cp_new_stat64(&stat
, statbuf
);
550 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
552 static noinline_for_stack
int
553 cp_statx(const struct kstat
*stat
, struct statx __user
*buffer
)
557 memset(&tmp
, 0, sizeof(tmp
));
559 tmp
.stx_mask
= stat
->result_mask
;
560 tmp
.stx_blksize
= stat
->blksize
;
561 tmp
.stx_attributes
= stat
->attributes
;
562 tmp
.stx_nlink
= stat
->nlink
;
563 tmp
.stx_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
564 tmp
.stx_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
565 tmp
.stx_mode
= stat
->mode
;
566 tmp
.stx_ino
= stat
->ino
;
567 tmp
.stx_size
= stat
->size
;
568 tmp
.stx_blocks
= stat
->blocks
;
569 tmp
.stx_attributes_mask
= stat
->attributes_mask
;
570 tmp
.stx_atime
.tv_sec
= stat
->atime
.tv_sec
;
571 tmp
.stx_atime
.tv_nsec
= stat
->atime
.tv_nsec
;
572 tmp
.stx_btime
.tv_sec
= stat
->btime
.tv_sec
;
573 tmp
.stx_btime
.tv_nsec
= stat
->btime
.tv_nsec
;
574 tmp
.stx_ctime
.tv_sec
= stat
->ctime
.tv_sec
;
575 tmp
.stx_ctime
.tv_nsec
= stat
->ctime
.tv_nsec
;
576 tmp
.stx_mtime
.tv_sec
= stat
->mtime
.tv_sec
;
577 tmp
.stx_mtime
.tv_nsec
= stat
->mtime
.tv_nsec
;
578 tmp
.stx_rdev_major
= MAJOR(stat
->rdev
);
579 tmp
.stx_rdev_minor
= MINOR(stat
->rdev
);
580 tmp
.stx_dev_major
= MAJOR(stat
->dev
);
581 tmp
.stx_dev_minor
= MINOR(stat
->dev
);
582 tmp
.stx_mnt_id
= stat
->mnt_id
;
584 return copy_to_user(buffer
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
587 int do_statx(int dfd
, const char __user
*filename
, unsigned flags
,
588 unsigned int mask
, struct statx __user
*buffer
)
593 if (mask
& STATX__RESERVED
)
595 if ((flags
& AT_STATX_SYNC_TYPE
) == AT_STATX_SYNC_TYPE
)
598 error
= vfs_statx(dfd
, filename
, flags
, &stat
, mask
);
602 return cp_statx(&stat
, buffer
);
606 * sys_statx - System call to get enhanced stats
607 * @dfd: Base directory to pathwalk from *or* fd to stat.
608 * @filename: File to stat or "" with AT_EMPTY_PATH
609 * @flags: AT_* flags to control pathwalk.
610 * @mask: Parts of statx struct actually required.
611 * @buffer: Result buffer.
613 * Note that fstat() can be emulated by setting dfd to the fd of interest,
614 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
616 SYSCALL_DEFINE5(statx
,
617 int, dfd
, const char __user
*, filename
, unsigned, flags
,
619 struct statx __user
*, buffer
)
621 return do_statx(dfd
, filename
, flags
, mask
, buffer
);
625 static int cp_compat_stat(struct kstat
*stat
, struct compat_stat __user
*ubuf
)
627 struct compat_stat tmp
;
629 if (!old_valid_dev(stat
->dev
) || !old_valid_dev(stat
->rdev
))
632 memset(&tmp
, 0, sizeof(tmp
));
633 tmp
.st_dev
= old_encode_dev(stat
->dev
);
634 tmp
.st_ino
= stat
->ino
;
635 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
637 tmp
.st_mode
= stat
->mode
;
638 tmp
.st_nlink
= stat
->nlink
;
639 if (tmp
.st_nlink
!= stat
->nlink
)
641 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
642 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
643 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
644 if ((u64
) stat
->size
> MAX_NON_LFS
)
646 tmp
.st_size
= stat
->size
;
647 tmp
.st_atime
= stat
->atime
.tv_sec
;
648 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
649 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
650 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
651 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
652 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
653 tmp
.st_blocks
= stat
->blocks
;
654 tmp
.st_blksize
= stat
->blksize
;
655 return copy_to_user(ubuf
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
658 COMPAT_SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
659 struct compat_stat __user
*, statbuf
)
664 error
= vfs_stat(filename
, &stat
);
667 return cp_compat_stat(&stat
, statbuf
);
670 COMPAT_SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
671 struct compat_stat __user
*, statbuf
)
676 error
= vfs_lstat(filename
, &stat
);
679 return cp_compat_stat(&stat
, statbuf
);
682 #ifndef __ARCH_WANT_STAT64
683 COMPAT_SYSCALL_DEFINE4(newfstatat
, unsigned int, dfd
,
684 const char __user
*, filename
,
685 struct compat_stat __user
*, statbuf
, int, flag
)
690 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
693 return cp_compat_stat(&stat
, statbuf
);
697 COMPAT_SYSCALL_DEFINE2(newfstat
, unsigned int, fd
,
698 struct compat_stat __user
*, statbuf
)
701 int error
= vfs_fstat(fd
, &stat
);
704 error
= cp_compat_stat(&stat
, statbuf
);
709 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
710 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
712 inode
->i_blocks
+= bytes
>> 9;
714 inode
->i_bytes
+= bytes
;
715 if (inode
->i_bytes
>= 512) {
717 inode
->i_bytes
-= 512;
720 EXPORT_SYMBOL(__inode_add_bytes
);
722 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
724 spin_lock(&inode
->i_lock
);
725 __inode_add_bytes(inode
, bytes
);
726 spin_unlock(&inode
->i_lock
);
729 EXPORT_SYMBOL(inode_add_bytes
);
731 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
733 inode
->i_blocks
-= bytes
>> 9;
735 if (inode
->i_bytes
< bytes
) {
737 inode
->i_bytes
+= 512;
739 inode
->i_bytes
-= bytes
;
742 EXPORT_SYMBOL(__inode_sub_bytes
);
744 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
746 spin_lock(&inode
->i_lock
);
747 __inode_sub_bytes(inode
, bytes
);
748 spin_unlock(&inode
->i_lock
);
751 EXPORT_SYMBOL(inode_sub_bytes
);
753 loff_t
inode_get_bytes(struct inode
*inode
)
757 spin_lock(&inode
->i_lock
);
758 ret
= __inode_get_bytes(inode
);
759 spin_unlock(&inode
->i_lock
);
763 EXPORT_SYMBOL(inode_get_bytes
);
765 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
767 /* Caller is here responsible for sufficient locking
768 * (ie. inode->i_lock) */
769 inode
->i_blocks
= bytes
>> 9;
770 inode
->i_bytes
= bytes
& 511;
773 EXPORT_SYMBOL(inode_set_bytes
);