1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/blkdev.h>
9 #include <linux/export.h>
11 #include <linux/errno.h>
12 #include <linux/file.h>
13 #include <linux/highuid.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/cred.h>
18 #include <linux/syscalls.h>
19 #include <linux/pagemap.h>
20 #include <linux/compat.h>
21 #include <linux/iversion.h>
23 #include <linux/uaccess.h>
24 #include <asm/unistd.h>
30 * generic_fillattr - Fill in the basic attributes from the inode struct
31 * @idmap: idmap of the mount the inode was found from
32 * @request_mask: statx request_mask
33 * @inode: Inode to use as the source
34 * @stat: Where to fill in the attributes
36 * Fill in the basic attributes in the kstat structure from data that's to be
37 * found on the VFS inode structure. This is the default if no getattr inode
38 * operation is supplied.
40 * If the inode has been found through an idmapped mount the idmap of
41 * the vfsmount must be passed through @idmap. This function will then
42 * take care to map the inode according to @idmap before filling in the
43 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
44 * performed on the raw inode simply pass @nop_mnt_idmap.
46 void generic_fillattr(struct mnt_idmap
*idmap
, u32 request_mask
,
47 struct inode
*inode
, struct kstat
*stat
)
49 vfsuid_t vfsuid
= i_uid_into_vfsuid(idmap
, inode
);
50 vfsgid_t vfsgid
= i_gid_into_vfsgid(idmap
, inode
);
52 stat
->dev
= inode
->i_sb
->s_dev
;
53 stat
->ino
= inode
->i_ino
;
54 stat
->mode
= inode
->i_mode
;
55 stat
->nlink
= inode
->i_nlink
;
56 stat
->uid
= vfsuid_into_kuid(vfsuid
);
57 stat
->gid
= vfsgid_into_kgid(vfsgid
);
58 stat
->rdev
= inode
->i_rdev
;
59 stat
->size
= i_size_read(inode
);
60 stat
->atime
= inode_get_atime(inode
);
61 stat
->mtime
= inode_get_mtime(inode
);
62 stat
->ctime
= inode_get_ctime(inode
);
63 stat
->blksize
= i_blocksize(inode
);
64 stat
->blocks
= inode
->i_blocks
;
66 if ((request_mask
& STATX_CHANGE_COOKIE
) && IS_I_VERSION(inode
)) {
67 stat
->result_mask
|= STATX_CHANGE_COOKIE
;
68 stat
->change_cookie
= inode_query_iversion(inode
);
72 EXPORT_SYMBOL(generic_fillattr
);
75 * generic_fill_statx_attr - Fill in the statx attributes from the inode flags
76 * @inode: Inode to use as the source
77 * @stat: Where to fill in the attribute flags
79 * Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
80 * inode that are published on i_flags and enforced by the VFS.
82 void generic_fill_statx_attr(struct inode
*inode
, struct kstat
*stat
)
84 if (inode
->i_flags
& S_IMMUTABLE
)
85 stat
->attributes
|= STATX_ATTR_IMMUTABLE
;
86 if (inode
->i_flags
& S_APPEND
)
87 stat
->attributes
|= STATX_ATTR_APPEND
;
88 stat
->attributes_mask
|= KSTAT_ATTR_VFS_FLAGS
;
90 EXPORT_SYMBOL(generic_fill_statx_attr
);
93 * vfs_getattr_nosec - getattr without security checks
94 * @path: file to get attributes from
95 * @stat: structure to return attributes in
96 * @request_mask: STATX_xxx flags indicating what the caller wants
97 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
99 * Get attributes without calling security_inode_getattr.
101 * Currently the only caller other than vfs_getattr is internal to the
102 * filehandle lookup code, which uses only the inode number and returns no
103 * attributes to any user. Any other code probably wants vfs_getattr.
105 int vfs_getattr_nosec(const struct path
*path
, struct kstat
*stat
,
106 u32 request_mask
, unsigned int query_flags
)
108 struct mnt_idmap
*idmap
;
109 struct inode
*inode
= d_backing_inode(path
->dentry
);
111 memset(stat
, 0, sizeof(*stat
));
112 stat
->result_mask
|= STATX_BASIC_STATS
;
113 query_flags
&= AT_STATX_SYNC_TYPE
;
115 /* allow the fs to override these if it really wants to */
116 /* SB_NOATIME means filesystem supplies dummy atime value */
117 if (inode
->i_sb
->s_flags
& SB_NOATIME
)
118 stat
->result_mask
&= ~STATX_ATIME
;
121 * Note: If you add another clause to set an attribute flag, please
122 * update attributes_mask below.
124 if (IS_AUTOMOUNT(inode
))
125 stat
->attributes
|= STATX_ATTR_AUTOMOUNT
;
128 stat
->attributes
|= STATX_ATTR_DAX
;
130 stat
->attributes_mask
|= (STATX_ATTR_AUTOMOUNT
|
133 idmap
= mnt_idmap(path
->mnt
);
134 if (inode
->i_op
->getattr
)
135 return inode
->i_op
->getattr(idmap
, path
, stat
,
137 query_flags
| AT_GETATTR_NOSEC
);
139 generic_fillattr(idmap
, request_mask
, inode
, stat
);
142 EXPORT_SYMBOL(vfs_getattr_nosec
);
145 * vfs_getattr - Get the enhanced basic attributes of a file
146 * @path: The file of interest
147 * @stat: Where to return the statistics
148 * @request_mask: STATX_xxx flags indicating what the caller wants
149 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
151 * Ask the filesystem for a file's attributes. The caller must indicate in
152 * request_mask and query_flags to indicate what they want.
154 * If the file is remote, the filesystem can be forced to update the attributes
155 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
156 * suppress the update by passing AT_STATX_DONT_SYNC.
158 * Bits must have been set in request_mask to indicate which attributes the
159 * caller wants retrieving. Any such attribute not requested may be returned
160 * anyway, but the value may be approximate, and, if remote, may not have been
161 * synchronised with the server.
163 * 0 will be returned on success, and a -ve error code if unsuccessful.
165 int vfs_getattr(const struct path
*path
, struct kstat
*stat
,
166 u32 request_mask
, unsigned int query_flags
)
170 if (WARN_ON_ONCE(query_flags
& AT_GETATTR_NOSEC
))
173 retval
= security_inode_getattr(path
);
176 return vfs_getattr_nosec(path
, stat
, request_mask
, query_flags
);
178 EXPORT_SYMBOL(vfs_getattr
);
181 * vfs_fstat - Get the basic attributes by file descriptor
182 * @fd: The file descriptor referring to the file of interest
183 * @stat: The result structure to fill in.
185 * This function is a wrapper around vfs_getattr(). The main difference is
186 * that it uses a file descriptor to determine the file location.
188 * 0 will be returned on success, and a -ve error code if unsuccessful.
190 int vfs_fstat(int fd
, struct kstat
*stat
)
198 error
= vfs_getattr(&f
.file
->f_path
, stat
, STATX_BASIC_STATS
, 0);
203 int getname_statx_lookup_flags(int flags
)
205 int lookup_flags
= 0;
207 if (!(flags
& AT_SYMLINK_NOFOLLOW
))
208 lookup_flags
|= LOOKUP_FOLLOW
;
209 if (!(flags
& AT_NO_AUTOMOUNT
))
210 lookup_flags
|= LOOKUP_AUTOMOUNT
;
211 if (flags
& AT_EMPTY_PATH
)
212 lookup_flags
|= LOOKUP_EMPTY
;
218 * vfs_statx - Get basic and extra attributes by filename
219 * @dfd: A file descriptor representing the base dir for a relative filename
220 * @filename: The name of the file of interest
221 * @flags: Flags to control the query
222 * @stat: The result structure to fill in.
223 * @request_mask: STATX_xxx flags indicating what the caller wants
225 * This function is a wrapper around vfs_getattr(). The main difference is
226 * that it uses a filename and base directory to determine the file location.
227 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
228 * at the given name from being referenced.
230 * 0 will be returned on success, and a -ve error code if unsuccessful.
232 static int vfs_statx(int dfd
, struct filename
*filename
, int flags
,
233 struct kstat
*stat
, u32 request_mask
)
236 unsigned int lookup_flags
= getname_statx_lookup_flags(flags
);
239 if (flags
& ~(AT_SYMLINK_NOFOLLOW
| AT_NO_AUTOMOUNT
| AT_EMPTY_PATH
|
244 error
= filename_lookup(dfd
, filename
, lookup_flags
, &path
, NULL
);
248 error
= vfs_getattr(&path
, stat
, request_mask
, flags
);
250 if (request_mask
& STATX_MNT_ID_UNIQUE
) {
251 stat
->mnt_id
= real_mount(path
.mnt
)->mnt_id_unique
;
252 stat
->result_mask
|= STATX_MNT_ID_UNIQUE
;
254 stat
->mnt_id
= real_mount(path
.mnt
)->mnt_id
;
255 stat
->result_mask
|= STATX_MNT_ID
;
258 if (path
.mnt
->mnt_root
== path
.dentry
)
259 stat
->attributes
|= STATX_ATTR_MOUNT_ROOT
;
260 stat
->attributes_mask
|= STATX_ATTR_MOUNT_ROOT
;
262 /* Handle STATX_DIOALIGN for block devices. */
263 if (request_mask
& STATX_DIOALIGN
) {
264 struct inode
*inode
= d_backing_inode(path
.dentry
);
266 if (S_ISBLK(inode
->i_mode
))
267 bdev_statx_dioalign(inode
, stat
);
271 if (retry_estale(error
, lookup_flags
)) {
272 lookup_flags
|= LOOKUP_REVAL
;
279 int vfs_fstatat(int dfd
, const char __user
*filename
,
280 struct kstat
*stat
, int flags
)
283 int statx_flags
= flags
| AT_NO_AUTOMOUNT
;
284 struct filename
*name
;
287 * Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
289 * If AT_EMPTY_PATH is set, we expect the common case to be that
290 * empty path, and avoid doing all the extra pathname work.
292 if (dfd
>= 0 && flags
== AT_EMPTY_PATH
) {
295 ret
= get_user(c
, filename
);
300 return vfs_fstat(dfd
, stat
);
303 name
= getname_flags(filename
, getname_statx_lookup_flags(statx_flags
), NULL
);
304 ret
= vfs_statx(dfd
, name
, statx_flags
, stat
, STATX_BASIC_STATS
);
310 #ifdef __ARCH_WANT_OLD_STAT
313 * For backward compatibility? Maybe this should be moved
314 * into arch/i386 instead?
316 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
318 static int warncount
= 5;
319 struct __old_kernel_stat tmp
;
323 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
325 } else if (warncount
< 0) {
326 /* it's laughable, but... */
330 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
331 tmp
.st_dev
= old_encode_dev(stat
->dev
);
332 tmp
.st_ino
= stat
->ino
;
333 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
335 tmp
.st_mode
= stat
->mode
;
336 tmp
.st_nlink
= stat
->nlink
;
337 if (tmp
.st_nlink
!= stat
->nlink
)
339 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
340 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
341 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
342 #if BITS_PER_LONG == 32
343 if (stat
->size
> MAX_NON_LFS
)
346 tmp
.st_size
= stat
->size
;
347 tmp
.st_atime
= stat
->atime
.tv_sec
;
348 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
349 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
350 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
353 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
354 struct __old_kernel_stat __user
*, statbuf
)
359 error
= vfs_stat(filename
, &stat
);
363 return cp_old_stat(&stat
, statbuf
);
366 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
367 struct __old_kernel_stat __user
*, statbuf
)
372 error
= vfs_lstat(filename
, &stat
);
376 return cp_old_stat(&stat
, statbuf
);
379 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
382 int error
= vfs_fstat(fd
, &stat
);
385 error
= cp_old_stat(&stat
, statbuf
);
390 #endif /* __ARCH_WANT_OLD_STAT */
392 #ifdef __ARCH_WANT_NEW_STAT
394 #ifndef INIT_STRUCT_STAT_PADDING
395 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
398 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
402 if (sizeof(tmp
.st_dev
) < 4 && !old_valid_dev(stat
->dev
))
404 if (sizeof(tmp
.st_rdev
) < 4 && !old_valid_dev(stat
->rdev
))
406 #if BITS_PER_LONG == 32
407 if (stat
->size
> MAX_NON_LFS
)
411 INIT_STRUCT_STAT_PADDING(tmp
);
412 tmp
.st_dev
= new_encode_dev(stat
->dev
);
413 tmp
.st_ino
= stat
->ino
;
414 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
416 tmp
.st_mode
= stat
->mode
;
417 tmp
.st_nlink
= stat
->nlink
;
418 if (tmp
.st_nlink
!= stat
->nlink
)
420 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
421 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
422 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
423 tmp
.st_size
= stat
->size
;
424 tmp
.st_atime
= stat
->atime
.tv_sec
;
425 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
426 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
427 #ifdef STAT_HAVE_NSEC
428 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
429 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
430 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
432 tmp
.st_blocks
= stat
->blocks
;
433 tmp
.st_blksize
= stat
->blksize
;
434 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
437 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
438 struct stat __user
*, statbuf
)
441 int error
= vfs_stat(filename
, &stat
);
445 return cp_new_stat(&stat
, statbuf
);
448 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
449 struct stat __user
*, statbuf
)
454 error
= vfs_lstat(filename
, &stat
);
458 return cp_new_stat(&stat
, statbuf
);
461 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
462 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
463 struct stat __user
*, statbuf
, int, flag
)
468 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
471 return cp_new_stat(&stat
, statbuf
);
475 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
478 int error
= vfs_fstat(fd
, &stat
);
481 error
= cp_new_stat(&stat
, statbuf
);
487 static int do_readlinkat(int dfd
, const char __user
*pathname
,
488 char __user
*buf
, int bufsiz
)
493 unsigned int lookup_flags
= LOOKUP_EMPTY
;
499 error
= user_path_at_empty(dfd
, pathname
, lookup_flags
, &path
, &empty
);
501 struct inode
*inode
= d_backing_inode(path
.dentry
);
503 error
= empty
? -ENOENT
: -EINVAL
;
505 * AFS mountpoints allow readlink(2) but are not symlinks
507 if (d_is_symlink(path
.dentry
) || inode
->i_op
->readlink
) {
508 error
= security_inode_readlink(path
.dentry
);
511 error
= vfs_readlink(path
.dentry
, buf
, bufsiz
);
515 if (retry_estale(error
, lookup_flags
)) {
516 lookup_flags
|= LOOKUP_REVAL
;
523 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
524 char __user
*, buf
, int, bufsiz
)
526 return do_readlinkat(dfd
, pathname
, buf
, bufsiz
);
529 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
532 return do_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
536 /* ---------- LFS-64 ----------- */
537 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
539 #ifndef INIT_STRUCT_STAT64_PADDING
540 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
543 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
547 INIT_STRUCT_STAT64_PADDING(tmp
);
549 /* mips has weird padding, so we don't get 64 bits there */
550 tmp
.st_dev
= new_encode_dev(stat
->dev
);
551 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
553 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
554 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
556 tmp
.st_ino
= stat
->ino
;
557 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
559 #ifdef STAT64_HAS_BROKEN_ST_INO
560 tmp
.__st_ino
= stat
->ino
;
562 tmp
.st_mode
= stat
->mode
;
563 tmp
.st_nlink
= stat
->nlink
;
564 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
565 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
566 tmp
.st_atime
= stat
->atime
.tv_sec
;
567 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
568 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
569 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
570 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
571 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
572 tmp
.st_size
= stat
->size
;
573 tmp
.st_blocks
= stat
->blocks
;
574 tmp
.st_blksize
= stat
->blksize
;
575 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
578 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
579 struct stat64 __user
*, statbuf
)
582 int error
= vfs_stat(filename
, &stat
);
585 error
= cp_new_stat64(&stat
, statbuf
);
590 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
591 struct stat64 __user
*, statbuf
)
594 int error
= vfs_lstat(filename
, &stat
);
597 error
= cp_new_stat64(&stat
, statbuf
);
602 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
605 int error
= vfs_fstat(fd
, &stat
);
608 error
= cp_new_stat64(&stat
, statbuf
);
613 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
614 struct stat64 __user
*, statbuf
, int, flag
)
619 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
622 return cp_new_stat64(&stat
, statbuf
);
624 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
626 static noinline_for_stack
int
627 cp_statx(const struct kstat
*stat
, struct statx __user
*buffer
)
631 memset(&tmp
, 0, sizeof(tmp
));
633 /* STATX_CHANGE_COOKIE is kernel-only for now */
634 tmp
.stx_mask
= stat
->result_mask
& ~STATX_CHANGE_COOKIE
;
635 tmp
.stx_blksize
= stat
->blksize
;
636 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
637 tmp
.stx_attributes
= stat
->attributes
& ~STATX_ATTR_CHANGE_MONOTONIC
;
638 tmp
.stx_nlink
= stat
->nlink
;
639 tmp
.stx_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
640 tmp
.stx_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
641 tmp
.stx_mode
= stat
->mode
;
642 tmp
.stx_ino
= stat
->ino
;
643 tmp
.stx_size
= stat
->size
;
644 tmp
.stx_blocks
= stat
->blocks
;
645 tmp
.stx_attributes_mask
= stat
->attributes_mask
;
646 tmp
.stx_atime
.tv_sec
= stat
->atime
.tv_sec
;
647 tmp
.stx_atime
.tv_nsec
= stat
->atime
.tv_nsec
;
648 tmp
.stx_btime
.tv_sec
= stat
->btime
.tv_sec
;
649 tmp
.stx_btime
.tv_nsec
= stat
->btime
.tv_nsec
;
650 tmp
.stx_ctime
.tv_sec
= stat
->ctime
.tv_sec
;
651 tmp
.stx_ctime
.tv_nsec
= stat
->ctime
.tv_nsec
;
652 tmp
.stx_mtime
.tv_sec
= stat
->mtime
.tv_sec
;
653 tmp
.stx_mtime
.tv_nsec
= stat
->mtime
.tv_nsec
;
654 tmp
.stx_rdev_major
= MAJOR(stat
->rdev
);
655 tmp
.stx_rdev_minor
= MINOR(stat
->rdev
);
656 tmp
.stx_dev_major
= MAJOR(stat
->dev
);
657 tmp
.stx_dev_minor
= MINOR(stat
->dev
);
658 tmp
.stx_mnt_id
= stat
->mnt_id
;
659 tmp
.stx_dio_mem_align
= stat
->dio_mem_align
;
660 tmp
.stx_dio_offset_align
= stat
->dio_offset_align
;
662 return copy_to_user(buffer
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
665 int do_statx(int dfd
, struct filename
*filename
, unsigned int flags
,
666 unsigned int mask
, struct statx __user
*buffer
)
671 if (mask
& STATX__RESERVED
)
673 if ((flags
& AT_STATX_SYNC_TYPE
) == AT_STATX_SYNC_TYPE
)
676 /* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
679 mask
&= ~STATX_CHANGE_COOKIE
;
681 error
= vfs_statx(dfd
, filename
, flags
, &stat
, mask
);
685 return cp_statx(&stat
, buffer
);
689 * sys_statx - System call to get enhanced stats
690 * @dfd: Base directory to pathwalk from *or* fd to stat.
691 * @filename: File to stat or "" with AT_EMPTY_PATH
692 * @flags: AT_* flags to control pathwalk.
693 * @mask: Parts of statx struct actually required.
694 * @buffer: Result buffer.
696 * Note that fstat() can be emulated by setting dfd to the fd of interest,
697 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
699 SYSCALL_DEFINE5(statx
,
700 int, dfd
, const char __user
*, filename
, unsigned, flags
,
702 struct statx __user
*, buffer
)
705 struct filename
*name
;
707 name
= getname_flags(filename
, getname_statx_lookup_flags(flags
), NULL
);
708 ret
= do_statx(dfd
, name
, flags
, mask
, buffer
);
714 #if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
715 static int cp_compat_stat(struct kstat
*stat
, struct compat_stat __user
*ubuf
)
717 struct compat_stat tmp
;
719 if (sizeof(tmp
.st_dev
) < 4 && !old_valid_dev(stat
->dev
))
721 if (sizeof(tmp
.st_rdev
) < 4 && !old_valid_dev(stat
->rdev
))
724 memset(&tmp
, 0, sizeof(tmp
));
725 tmp
.st_dev
= new_encode_dev(stat
->dev
);
726 tmp
.st_ino
= stat
->ino
;
727 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
729 tmp
.st_mode
= stat
->mode
;
730 tmp
.st_nlink
= stat
->nlink
;
731 if (tmp
.st_nlink
!= stat
->nlink
)
733 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
734 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
735 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
736 if ((u64
) stat
->size
> MAX_NON_LFS
)
738 tmp
.st_size
= stat
->size
;
739 tmp
.st_atime
= stat
->atime
.tv_sec
;
740 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
741 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
742 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
743 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
744 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
745 tmp
.st_blocks
= stat
->blocks
;
746 tmp
.st_blksize
= stat
->blksize
;
747 return copy_to_user(ubuf
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
750 COMPAT_SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
751 struct compat_stat __user
*, statbuf
)
756 error
= vfs_stat(filename
, &stat
);
759 return cp_compat_stat(&stat
, statbuf
);
762 COMPAT_SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
763 struct compat_stat __user
*, statbuf
)
768 error
= vfs_lstat(filename
, &stat
);
771 return cp_compat_stat(&stat
, statbuf
);
774 #ifndef __ARCH_WANT_STAT64
775 COMPAT_SYSCALL_DEFINE4(newfstatat
, unsigned int, dfd
,
776 const char __user
*, filename
,
777 struct compat_stat __user
*, statbuf
, int, flag
)
782 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
785 return cp_compat_stat(&stat
, statbuf
);
789 COMPAT_SYSCALL_DEFINE2(newfstat
, unsigned int, fd
,
790 struct compat_stat __user
*, statbuf
)
793 int error
= vfs_fstat(fd
, &stat
);
796 error
= cp_compat_stat(&stat
, statbuf
);
801 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
802 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
804 inode
->i_blocks
+= bytes
>> 9;
806 inode
->i_bytes
+= bytes
;
807 if (inode
->i_bytes
>= 512) {
809 inode
->i_bytes
-= 512;
812 EXPORT_SYMBOL(__inode_add_bytes
);
814 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
816 spin_lock(&inode
->i_lock
);
817 __inode_add_bytes(inode
, bytes
);
818 spin_unlock(&inode
->i_lock
);
821 EXPORT_SYMBOL(inode_add_bytes
);
823 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
825 inode
->i_blocks
-= bytes
>> 9;
827 if (inode
->i_bytes
< bytes
) {
829 inode
->i_bytes
+= 512;
831 inode
->i_bytes
-= bytes
;
834 EXPORT_SYMBOL(__inode_sub_bytes
);
836 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
838 spin_lock(&inode
->i_lock
);
839 __inode_sub_bytes(inode
, bytes
);
840 spin_unlock(&inode
->i_lock
);
843 EXPORT_SYMBOL(inode_sub_bytes
);
845 loff_t
inode_get_bytes(struct inode
*inode
)
849 spin_lock(&inode
->i_lock
);
850 ret
= __inode_get_bytes(inode
);
851 spin_unlock(&inode
->i_lock
);
855 EXPORT_SYMBOL(inode_get_bytes
);
857 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
859 /* Caller is here responsible for sufficient locking
860 * (ie. inode->i_lock) */
861 inode
->i_blocks
= bytes
>> 9;
862 inode
->i_bytes
= bytes
& 511;
865 EXPORT_SYMBOL(inode_set_bytes
);