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 passs @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 stat
->mnt_id
= real_mount(path
.mnt
)->mnt_id
;
251 stat
->result_mask
|= STATX_MNT_ID
;
253 if (path
.mnt
->mnt_root
== path
.dentry
)
254 stat
->attributes
|= STATX_ATTR_MOUNT_ROOT
;
255 stat
->attributes_mask
|= STATX_ATTR_MOUNT_ROOT
;
257 /* Handle STATX_DIOALIGN for block devices. */
258 if (request_mask
& STATX_DIOALIGN
) {
259 struct inode
*inode
= d_backing_inode(path
.dentry
);
261 if (S_ISBLK(inode
->i_mode
))
262 bdev_statx_dioalign(inode
, stat
);
266 if (retry_estale(error
, lookup_flags
)) {
267 lookup_flags
|= LOOKUP_REVAL
;
274 int vfs_fstatat(int dfd
, const char __user
*filename
,
275 struct kstat
*stat
, int flags
)
278 int statx_flags
= flags
| AT_NO_AUTOMOUNT
;
279 struct filename
*name
;
282 * Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
284 * If AT_EMPTY_PATH is set, we expect the common case to be that
285 * empty path, and avoid doing all the extra pathname work.
287 if (dfd
>= 0 && flags
== AT_EMPTY_PATH
) {
290 ret
= get_user(c
, filename
);
295 return vfs_fstat(dfd
, stat
);
298 name
= getname_flags(filename
, getname_statx_lookup_flags(statx_flags
), NULL
);
299 ret
= vfs_statx(dfd
, name
, statx_flags
, stat
, STATX_BASIC_STATS
);
305 #ifdef __ARCH_WANT_OLD_STAT
308 * For backward compatibility? Maybe this should be moved
309 * into arch/i386 instead?
311 static int cp_old_stat(struct kstat
*stat
, struct __old_kernel_stat __user
* statbuf
)
313 static int warncount
= 5;
314 struct __old_kernel_stat tmp
;
318 printk(KERN_WARNING
"VFS: Warning: %s using old stat() call. Recompile your binary.\n",
320 } else if (warncount
< 0) {
321 /* it's laughable, but... */
325 memset(&tmp
, 0, sizeof(struct __old_kernel_stat
));
326 tmp
.st_dev
= old_encode_dev(stat
->dev
);
327 tmp
.st_ino
= stat
->ino
;
328 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
330 tmp
.st_mode
= stat
->mode
;
331 tmp
.st_nlink
= stat
->nlink
;
332 if (tmp
.st_nlink
!= stat
->nlink
)
334 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
335 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
336 tmp
.st_rdev
= old_encode_dev(stat
->rdev
);
337 #if BITS_PER_LONG == 32
338 if (stat
->size
> MAX_NON_LFS
)
341 tmp
.st_size
= stat
->size
;
342 tmp
.st_atime
= stat
->atime
.tv_sec
;
343 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
344 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
345 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
348 SYSCALL_DEFINE2(stat
, const char __user
*, filename
,
349 struct __old_kernel_stat __user
*, statbuf
)
354 error
= vfs_stat(filename
, &stat
);
358 return cp_old_stat(&stat
, statbuf
);
361 SYSCALL_DEFINE2(lstat
, const char __user
*, filename
,
362 struct __old_kernel_stat __user
*, statbuf
)
367 error
= vfs_lstat(filename
, &stat
);
371 return cp_old_stat(&stat
, statbuf
);
374 SYSCALL_DEFINE2(fstat
, unsigned int, fd
, struct __old_kernel_stat __user
*, statbuf
)
377 int error
= vfs_fstat(fd
, &stat
);
380 error
= cp_old_stat(&stat
, statbuf
);
385 #endif /* __ARCH_WANT_OLD_STAT */
387 #ifdef __ARCH_WANT_NEW_STAT
389 #ifndef INIT_STRUCT_STAT_PADDING
390 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
393 static int cp_new_stat(struct kstat
*stat
, struct stat __user
*statbuf
)
397 if (sizeof(tmp
.st_dev
) < 4 && !old_valid_dev(stat
->dev
))
399 if (sizeof(tmp
.st_rdev
) < 4 && !old_valid_dev(stat
->rdev
))
401 #if BITS_PER_LONG == 32
402 if (stat
->size
> MAX_NON_LFS
)
406 INIT_STRUCT_STAT_PADDING(tmp
);
407 tmp
.st_dev
= new_encode_dev(stat
->dev
);
408 tmp
.st_ino
= stat
->ino
;
409 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
411 tmp
.st_mode
= stat
->mode
;
412 tmp
.st_nlink
= stat
->nlink
;
413 if (tmp
.st_nlink
!= stat
->nlink
)
415 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
416 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
417 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
418 tmp
.st_size
= stat
->size
;
419 tmp
.st_atime
= stat
->atime
.tv_sec
;
420 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
421 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
422 #ifdef STAT_HAVE_NSEC
423 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
424 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
425 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
427 tmp
.st_blocks
= stat
->blocks
;
428 tmp
.st_blksize
= stat
->blksize
;
429 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
432 SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
433 struct stat __user
*, statbuf
)
436 int error
= vfs_stat(filename
, &stat
);
440 return cp_new_stat(&stat
, statbuf
);
443 SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
444 struct stat __user
*, statbuf
)
449 error
= vfs_lstat(filename
, &stat
);
453 return cp_new_stat(&stat
, statbuf
);
456 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
457 SYSCALL_DEFINE4(newfstatat
, int, dfd
, const char __user
*, filename
,
458 struct stat __user
*, statbuf
, int, flag
)
463 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
466 return cp_new_stat(&stat
, statbuf
);
470 SYSCALL_DEFINE2(newfstat
, unsigned int, fd
, struct stat __user
*, statbuf
)
473 int error
= vfs_fstat(fd
, &stat
);
476 error
= cp_new_stat(&stat
, statbuf
);
482 static int do_readlinkat(int dfd
, const char __user
*pathname
,
483 char __user
*buf
, int bufsiz
)
488 unsigned int lookup_flags
= LOOKUP_EMPTY
;
494 error
= user_path_at_empty(dfd
, pathname
, lookup_flags
, &path
, &empty
);
496 struct inode
*inode
= d_backing_inode(path
.dentry
);
498 error
= empty
? -ENOENT
: -EINVAL
;
500 * AFS mountpoints allow readlink(2) but are not symlinks
502 if (d_is_symlink(path
.dentry
) || inode
->i_op
->readlink
) {
503 error
= security_inode_readlink(path
.dentry
);
506 error
= vfs_readlink(path
.dentry
, buf
, bufsiz
);
510 if (retry_estale(error
, lookup_flags
)) {
511 lookup_flags
|= LOOKUP_REVAL
;
518 SYSCALL_DEFINE4(readlinkat
, int, dfd
, const char __user
*, pathname
,
519 char __user
*, buf
, int, bufsiz
)
521 return do_readlinkat(dfd
, pathname
, buf
, bufsiz
);
524 SYSCALL_DEFINE3(readlink
, const char __user
*, path
, char __user
*, buf
,
527 return do_readlinkat(AT_FDCWD
, path
, buf
, bufsiz
);
531 /* ---------- LFS-64 ----------- */
532 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
534 #ifndef INIT_STRUCT_STAT64_PADDING
535 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
538 static long cp_new_stat64(struct kstat
*stat
, struct stat64 __user
*statbuf
)
542 INIT_STRUCT_STAT64_PADDING(tmp
);
544 /* mips has weird padding, so we don't get 64 bits there */
545 tmp
.st_dev
= new_encode_dev(stat
->dev
);
546 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
548 tmp
.st_dev
= huge_encode_dev(stat
->dev
);
549 tmp
.st_rdev
= huge_encode_dev(stat
->rdev
);
551 tmp
.st_ino
= stat
->ino
;
552 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
554 #ifdef STAT64_HAS_BROKEN_ST_INO
555 tmp
.__st_ino
= stat
->ino
;
557 tmp
.st_mode
= stat
->mode
;
558 tmp
.st_nlink
= stat
->nlink
;
559 tmp
.st_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
560 tmp
.st_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
561 tmp
.st_atime
= stat
->atime
.tv_sec
;
562 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
563 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
564 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
565 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
566 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
567 tmp
.st_size
= stat
->size
;
568 tmp
.st_blocks
= stat
->blocks
;
569 tmp
.st_blksize
= stat
->blksize
;
570 return copy_to_user(statbuf
,&tmp
,sizeof(tmp
)) ? -EFAULT
: 0;
573 SYSCALL_DEFINE2(stat64
, const char __user
*, filename
,
574 struct stat64 __user
*, statbuf
)
577 int error
= vfs_stat(filename
, &stat
);
580 error
= cp_new_stat64(&stat
, statbuf
);
585 SYSCALL_DEFINE2(lstat64
, const char __user
*, filename
,
586 struct stat64 __user
*, statbuf
)
589 int error
= vfs_lstat(filename
, &stat
);
592 error
= cp_new_stat64(&stat
, statbuf
);
597 SYSCALL_DEFINE2(fstat64
, unsigned long, fd
, struct stat64 __user
*, statbuf
)
600 int error
= vfs_fstat(fd
, &stat
);
603 error
= cp_new_stat64(&stat
, statbuf
);
608 SYSCALL_DEFINE4(fstatat64
, int, dfd
, const char __user
*, filename
,
609 struct stat64 __user
*, statbuf
, int, flag
)
614 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
617 return cp_new_stat64(&stat
, statbuf
);
619 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
621 static noinline_for_stack
int
622 cp_statx(const struct kstat
*stat
, struct statx __user
*buffer
)
626 memset(&tmp
, 0, sizeof(tmp
));
628 /* STATX_CHANGE_COOKIE is kernel-only for now */
629 tmp
.stx_mask
= stat
->result_mask
& ~STATX_CHANGE_COOKIE
;
630 tmp
.stx_blksize
= stat
->blksize
;
631 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
632 tmp
.stx_attributes
= stat
->attributes
& ~STATX_ATTR_CHANGE_MONOTONIC
;
633 tmp
.stx_nlink
= stat
->nlink
;
634 tmp
.stx_uid
= from_kuid_munged(current_user_ns(), stat
->uid
);
635 tmp
.stx_gid
= from_kgid_munged(current_user_ns(), stat
->gid
);
636 tmp
.stx_mode
= stat
->mode
;
637 tmp
.stx_ino
= stat
->ino
;
638 tmp
.stx_size
= stat
->size
;
639 tmp
.stx_blocks
= stat
->blocks
;
640 tmp
.stx_attributes_mask
= stat
->attributes_mask
;
641 tmp
.stx_atime
.tv_sec
= stat
->atime
.tv_sec
;
642 tmp
.stx_atime
.tv_nsec
= stat
->atime
.tv_nsec
;
643 tmp
.stx_btime
.tv_sec
= stat
->btime
.tv_sec
;
644 tmp
.stx_btime
.tv_nsec
= stat
->btime
.tv_nsec
;
645 tmp
.stx_ctime
.tv_sec
= stat
->ctime
.tv_sec
;
646 tmp
.stx_ctime
.tv_nsec
= stat
->ctime
.tv_nsec
;
647 tmp
.stx_mtime
.tv_sec
= stat
->mtime
.tv_sec
;
648 tmp
.stx_mtime
.tv_nsec
= stat
->mtime
.tv_nsec
;
649 tmp
.stx_rdev_major
= MAJOR(stat
->rdev
);
650 tmp
.stx_rdev_minor
= MINOR(stat
->rdev
);
651 tmp
.stx_dev_major
= MAJOR(stat
->dev
);
652 tmp
.stx_dev_minor
= MINOR(stat
->dev
);
653 tmp
.stx_mnt_id
= stat
->mnt_id
;
654 tmp
.stx_dio_mem_align
= stat
->dio_mem_align
;
655 tmp
.stx_dio_offset_align
= stat
->dio_offset_align
;
657 return copy_to_user(buffer
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
660 int do_statx(int dfd
, struct filename
*filename
, unsigned int flags
,
661 unsigned int mask
, struct statx __user
*buffer
)
666 if (mask
& STATX__RESERVED
)
668 if ((flags
& AT_STATX_SYNC_TYPE
) == AT_STATX_SYNC_TYPE
)
671 /* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
674 mask
&= ~STATX_CHANGE_COOKIE
;
676 error
= vfs_statx(dfd
, filename
, flags
, &stat
, mask
);
680 return cp_statx(&stat
, buffer
);
684 * sys_statx - System call to get enhanced stats
685 * @dfd: Base directory to pathwalk from *or* fd to stat.
686 * @filename: File to stat or "" with AT_EMPTY_PATH
687 * @flags: AT_* flags to control pathwalk.
688 * @mask: Parts of statx struct actually required.
689 * @buffer: Result buffer.
691 * Note that fstat() can be emulated by setting dfd to the fd of interest,
692 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
694 SYSCALL_DEFINE5(statx
,
695 int, dfd
, const char __user
*, filename
, unsigned, flags
,
697 struct statx __user
*, buffer
)
700 struct filename
*name
;
702 name
= getname_flags(filename
, getname_statx_lookup_flags(flags
), NULL
);
703 ret
= do_statx(dfd
, name
, flags
, mask
, buffer
);
709 #if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
710 static int cp_compat_stat(struct kstat
*stat
, struct compat_stat __user
*ubuf
)
712 struct compat_stat tmp
;
714 if (sizeof(tmp
.st_dev
) < 4 && !old_valid_dev(stat
->dev
))
716 if (sizeof(tmp
.st_rdev
) < 4 && !old_valid_dev(stat
->rdev
))
719 memset(&tmp
, 0, sizeof(tmp
));
720 tmp
.st_dev
= new_encode_dev(stat
->dev
);
721 tmp
.st_ino
= stat
->ino
;
722 if (sizeof(tmp
.st_ino
) < sizeof(stat
->ino
) && tmp
.st_ino
!= stat
->ino
)
724 tmp
.st_mode
= stat
->mode
;
725 tmp
.st_nlink
= stat
->nlink
;
726 if (tmp
.st_nlink
!= stat
->nlink
)
728 SET_UID(tmp
.st_uid
, from_kuid_munged(current_user_ns(), stat
->uid
));
729 SET_GID(tmp
.st_gid
, from_kgid_munged(current_user_ns(), stat
->gid
));
730 tmp
.st_rdev
= new_encode_dev(stat
->rdev
);
731 if ((u64
) stat
->size
> MAX_NON_LFS
)
733 tmp
.st_size
= stat
->size
;
734 tmp
.st_atime
= stat
->atime
.tv_sec
;
735 tmp
.st_atime_nsec
= stat
->atime
.tv_nsec
;
736 tmp
.st_mtime
= stat
->mtime
.tv_sec
;
737 tmp
.st_mtime_nsec
= stat
->mtime
.tv_nsec
;
738 tmp
.st_ctime
= stat
->ctime
.tv_sec
;
739 tmp
.st_ctime_nsec
= stat
->ctime
.tv_nsec
;
740 tmp
.st_blocks
= stat
->blocks
;
741 tmp
.st_blksize
= stat
->blksize
;
742 return copy_to_user(ubuf
, &tmp
, sizeof(tmp
)) ? -EFAULT
: 0;
745 COMPAT_SYSCALL_DEFINE2(newstat
, const char __user
*, filename
,
746 struct compat_stat __user
*, statbuf
)
751 error
= vfs_stat(filename
, &stat
);
754 return cp_compat_stat(&stat
, statbuf
);
757 COMPAT_SYSCALL_DEFINE2(newlstat
, const char __user
*, filename
,
758 struct compat_stat __user
*, statbuf
)
763 error
= vfs_lstat(filename
, &stat
);
766 return cp_compat_stat(&stat
, statbuf
);
769 #ifndef __ARCH_WANT_STAT64
770 COMPAT_SYSCALL_DEFINE4(newfstatat
, unsigned int, dfd
,
771 const char __user
*, filename
,
772 struct compat_stat __user
*, statbuf
, int, flag
)
777 error
= vfs_fstatat(dfd
, filename
, &stat
, flag
);
780 return cp_compat_stat(&stat
, statbuf
);
784 COMPAT_SYSCALL_DEFINE2(newfstat
, unsigned int, fd
,
785 struct compat_stat __user
*, statbuf
)
788 int error
= vfs_fstat(fd
, &stat
);
791 error
= cp_compat_stat(&stat
, statbuf
);
796 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
797 void __inode_add_bytes(struct inode
*inode
, loff_t bytes
)
799 inode
->i_blocks
+= bytes
>> 9;
801 inode
->i_bytes
+= bytes
;
802 if (inode
->i_bytes
>= 512) {
804 inode
->i_bytes
-= 512;
807 EXPORT_SYMBOL(__inode_add_bytes
);
809 void inode_add_bytes(struct inode
*inode
, loff_t bytes
)
811 spin_lock(&inode
->i_lock
);
812 __inode_add_bytes(inode
, bytes
);
813 spin_unlock(&inode
->i_lock
);
816 EXPORT_SYMBOL(inode_add_bytes
);
818 void __inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
820 inode
->i_blocks
-= bytes
>> 9;
822 if (inode
->i_bytes
< bytes
) {
824 inode
->i_bytes
+= 512;
826 inode
->i_bytes
-= bytes
;
829 EXPORT_SYMBOL(__inode_sub_bytes
);
831 void inode_sub_bytes(struct inode
*inode
, loff_t bytes
)
833 spin_lock(&inode
->i_lock
);
834 __inode_sub_bytes(inode
, bytes
);
835 spin_unlock(&inode
->i_lock
);
838 EXPORT_SYMBOL(inode_sub_bytes
);
840 loff_t
inode_get_bytes(struct inode
*inode
)
844 spin_lock(&inode
->i_lock
);
845 ret
= __inode_get_bytes(inode
);
846 spin_unlock(&inode
->i_lock
);
850 EXPORT_SYMBOL(inode_get_bytes
);
852 void inode_set_bytes(struct inode
*inode
, loff_t bytes
)
854 /* Caller is here responsible for sufficient locking
855 * (ie. inode->i_lock) */
856 inode
->i_blocks
= bytes
>> 9;
857 inode
->i_bytes
= bytes
& 511;
860 EXPORT_SYMBOL(inode_set_bytes
);