blk-cgroup: fix rcu lockdep warning in blkg_lookup()
[linux-block.git] / fs / stat.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
1da177e4
LT
2/*
3 * linux/fs/stat.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */
7
2d985f8c 8#include <linux/blkdev.h>
630d9c47 9#include <linux/export.h>
1da177e4
LT
10#include <linux/mm.h>
11#include <linux/errno.h>
12#include <linux/file.h>
1da177e4
LT
13#include <linux/highuid.h>
14#include <linux/fs.h>
15#include <linux/namei.h>
16#include <linux/security.h>
5b825c3a 17#include <linux/cred.h>
1da177e4 18#include <linux/syscalls.h>
ba52de12 19#include <linux/pagemap.h>
ac565de3 20#include <linux/compat.h>
a1175d6b 21#include <linux/iversion.h>
1da177e4 22
7c0f6ba6 23#include <linux/uaccess.h>
1da177e4
LT
24#include <asm/unistd.h>
25
3934e36f 26#include "internal.h"
fa2fcf4f 27#include "mount.h"
3934e36f 28
a528d35e
DH
29/**
30 * generic_fillattr - Fill in the basic attributes from the inode struct
0d72b928
JL
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
a528d35e
DH
35 *
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.
0d56a451 39 *
b74d24f7
CB
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
0d56a451 43 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
b74d24f7 44 * performed on the raw inode simply passs @nop_mnt_idmap.
a528d35e 45 */
0d72b928
JL
46void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
47 struct inode *inode, struct kstat *stat)
1da177e4 48{
e67fe633
CB
49 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
50 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
a2bd096f 51
1da177e4
LT
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;
a2bd096f
CB
56 stat->uid = vfsuid_into_kuid(vfsuid);
57 stat->gid = vfsgid_into_kgid(vfsgid);
1da177e4 58 stat->rdev = inode->i_rdev;
3ddcd056 59 stat->size = i_size_read(inode);
16a94965
JL
60 stat->atime = inode_get_atime(inode);
61 stat->mtime = inode_get_mtime(inode);
647aa768 62 stat->ctime = inode_get_ctime(inode);
93407472 63 stat->blksize = i_blocksize(inode);
3ddcd056 64 stat->blocks = inode->i_blocks;
0d72b928
JL
65
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);
69 }
70
a528d35e 71}
1da177e4
LT
72EXPORT_SYMBOL(generic_fillattr);
73
4f911138
AG
74/**
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
78 *
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.
81 */
82void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
83{
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;
89}
90EXPORT_SYMBOL(generic_fill_statx_attr);
91
b7a6ec52
BF
92/**
93 * vfs_getattr_nosec - getattr without security checks
94 * @path: file to get attributes from
95 * @stat: structure to return attributes in
a528d35e 96 * @request_mask: STATX_xxx flags indicating what the caller wants
f2d077ff 97 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
b7a6ec52
BF
98 *
99 * Get attributes without calling security_inode_getattr.
100 *
101 * Currently the only caller other than vfs_getattr is internal to the
a528d35e
DH
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.
b7a6ec52 104 */
a528d35e
DH
105int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
106 u32 request_mask, unsigned int query_flags)
1da177e4 107{
b74d24f7 108 struct mnt_idmap *idmap;
bb668734 109 struct inode *inode = d_backing_inode(path->dentry);
1da177e4 110
a528d35e
DH
111 memset(stat, 0, sizeof(*stat));
112 stat->result_mask |= STATX_BASIC_STATS;
f2d077ff 113 query_flags &= AT_STATX_SYNC_TYPE;
801e5237
CH
114
115 /* allow the fs to override these if it really wants to */
761e28fa
MS
116 /* SB_NOATIME means filesystem supplies dummy atime value */
117 if (inode->i_sb->s_flags & SB_NOATIME)
801e5237 118 stat->result_mask &= ~STATX_ATIME;
5afa7e8b
TT
119
120 /*
121 * Note: If you add another clause to set an attribute flag, please
122 * update attributes_mask below.
123 */
801e5237
CH
124 if (IS_AUTOMOUNT(inode))
125 stat->attributes |= STATX_ATTR_AUTOMOUNT;
126
712b2698
IW
127 if (IS_DAX(inode))
128 stat->attributes |= STATX_ATTR_DAX;
129
5afa7e8b
TT
130 stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
131 STATX_ATTR_DAX);
132
b74d24f7 133 idmap = mnt_idmap(path->mnt);
1da177e4 134 if (inode->i_op->getattr)
b74d24f7 135 return inode->i_op->getattr(idmap, path, stat,
8a924db2
SB
136 request_mask,
137 query_flags | AT_GETATTR_NOSEC);
1da177e4 138
0d72b928 139 generic_fillattr(idmap, request_mask, inode, stat);
1da177e4
LT
140 return 0;
141}
b7a6ec52
BF
142EXPORT_SYMBOL(vfs_getattr_nosec);
143
a528d35e
DH
144/*
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
f2d077ff 149 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
a528d35e
DH
150 *
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.
153 *
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.
157 *
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.
162 *
163 * 0 will be returned on success, and a -ve error code if unsuccessful.
164 */
165int vfs_getattr(const struct path *path, struct kstat *stat,
166 u32 request_mask, unsigned int query_flags)
b7a6ec52
BF
167{
168 int retval;
169
8a924db2
SB
170 if (WARN_ON_ONCE(query_flags & AT_GETATTR_NOSEC))
171 return -EPERM;
172
3f7036a0 173 retval = security_inode_getattr(path);
b7a6ec52
BF
174 if (retval)
175 return retval;
a528d35e 176 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
b7a6ec52 177}
1da177e4
LT
178EXPORT_SYMBOL(vfs_getattr);
179
a528d35e 180/**
da9aa5d9 181 * vfs_fstat - Get the basic attributes by file descriptor
a528d35e
DH
182 * @fd: The file descriptor referring to the file of interest
183 * @stat: The result structure to fill in.
a528d35e
DH
184 *
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.
187 *
188 * 0 will be returned on success, and a -ve error code if unsuccessful.
189 */
da9aa5d9 190int vfs_fstat(int fd, struct kstat *stat)
1da177e4 191{
8c7493aa 192 struct fd f;
da9aa5d9 193 int error;
8c7493aa
EB
194
195 f = fdget_raw(fd);
da9aa5d9
CH
196 if (!f.file)
197 return -EBADF;
198 error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
199 fdput(f);
1da177e4
LT
200 return error;
201}
1da177e4 202
1b6fe6e0
SR
203int getname_statx_lookup_flags(int flags)
204{
205 int lookup_flags = 0;
206
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;
213
214 return lookup_flags;
215}
216
a528d35e
DH
217/**
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
224 *
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.
229 *
a528d35e
DH
230 * 0 will be returned on success, and a -ve error code if unsuccessful.
231 */
1b6fe6e0 232static int vfs_statx(int dfd, struct filename *filename, int flags,
a528d35e 233 struct kstat *stat, u32 request_mask)
0112fc22 234{
2eae7a18 235 struct path path;
1b6fe6e0 236 unsigned int lookup_flags = getname_statx_lookup_flags(flags);
b3f05150 237 int error;
0112fc22 238
b3f05150 239 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
f2d077ff 240 AT_STATX_SYNC_TYPE))
a528d35e 241 return -EINVAL;
b3f05150 242
836fb7e7 243retry:
1b6fe6e0 244 error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
2eae7a18
CH
245 if (error)
246 goto out;
247
a528d35e 248 error = vfs_getattr(&path, stat, request_mask, flags);
2d985f8c 249
fa2fcf4f
MS
250 stat->mnt_id = real_mount(path.mnt)->mnt_id;
251 stat->result_mask |= STATX_MNT_ID;
2d985f8c 252
80340fe3
MS
253 if (path.mnt->mnt_root == path.dentry)
254 stat->attributes |= STATX_ATTR_MOUNT_ROOT;
255 stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
2d985f8c
EB
256
257 /* Handle STATX_DIOALIGN for block devices. */
258 if (request_mask & STATX_DIOALIGN) {
259 struct inode *inode = d_backing_inode(path.dentry);
260
261 if (S_ISBLK(inode->i_mode))
262 bdev_statx_dioalign(inode, stat);
263 }
264
2eae7a18 265 path_put(&path);
836fb7e7
JL
266 if (retry_estale(error, lookup_flags)) {
267 lookup_flags |= LOOKUP_REVAL;
268 goto retry;
269 }
0112fc22
OD
270out:
271 return error;
272}
2eae7a18 273
09f1bde4
CH
274int vfs_fstatat(int dfd, const char __user *filename,
275 struct kstat *stat, int flags)
276{
1b6fe6e0
SR
277 int ret;
278 int statx_flags = flags | AT_NO_AUTOMOUNT;
279 struct filename *name;
280
9013c51c
LT
281 /*
282 * Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
283 *
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.
286 */
287 if (dfd >= 0 && flags == AT_EMPTY_PATH) {
288 char c;
289
290 ret = get_user(c, filename);
291 if (unlikely(ret))
292 return ret;
293
294 if (likely(!c))
295 return vfs_fstat(dfd, stat);
296 }
297
1b6fe6e0
SR
298 name = getname_flags(filename, getname_statx_lookup_flags(statx_flags), NULL);
299 ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
300 putname(name);
301
302 return ret;
09f1bde4 303}
0112fc22 304
1da177e4
LT
305#ifdef __ARCH_WANT_OLD_STAT
306
307/*
308 * For backward compatibility? Maybe this should be moved
309 * into arch/i386 instead?
310 */
311static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
312{
313 static int warncount = 5;
314 struct __old_kernel_stat tmp;
a528d35e 315
1da177e4
LT
316 if (warncount > 0) {
317 warncount--;
318 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
319 current->comm);
320 } else if (warncount < 0) {
321 /* it's laughable, but... */
322 warncount = 0;
323 }
324
325 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
326 tmp.st_dev = old_encode_dev(stat->dev);
327 tmp.st_ino = stat->ino;
afefdbb2
DH
328 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
329 return -EOVERFLOW;
1da177e4
LT
330 tmp.st_mode = stat->mode;
331 tmp.st_nlink = stat->nlink;
332 if (tmp.st_nlink != stat->nlink)
333 return -EOVERFLOW;
a7c1938e
EB
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));
1da177e4
LT
336 tmp.st_rdev = old_encode_dev(stat->rdev);
337#if BITS_PER_LONG == 32
338 if (stat->size > MAX_NON_LFS)
339 return -EOVERFLOW;
a528d35e 340#endif
1da177e4
LT
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;
346}
347
c7887325
DH
348SYSCALL_DEFINE2(stat, const char __user *, filename,
349 struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
350{
351 struct kstat stat;
2eae7a18 352 int error;
1da177e4 353
2eae7a18
CH
354 error = vfs_stat(filename, &stat);
355 if (error)
356 return error;
1da177e4 357
2eae7a18 358 return cp_old_stat(&stat, statbuf);
1da177e4 359}
257ac264 360
c7887325
DH
361SYSCALL_DEFINE2(lstat, const char __user *, filename,
362 struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
363{
364 struct kstat stat;
2eae7a18 365 int error;
1da177e4 366
2eae7a18
CH
367 error = vfs_lstat(filename, &stat);
368 if (error)
369 return error;
1da177e4 370
2eae7a18 371 return cp_old_stat(&stat, statbuf);
1da177e4 372}
257ac264
HC
373
374SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
375{
376 struct kstat stat;
377 int error = vfs_fstat(fd, &stat);
378
379 if (!error)
380 error = cp_old_stat(&stat, statbuf);
381
382 return error;
383}
384
385#endif /* __ARCH_WANT_OLD_STAT */
386
82b355d1
AB
387#ifdef __ARCH_WANT_NEW_STAT
388
8529f613
LT
389#ifndef INIT_STRUCT_STAT_PADDING
390# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
391#endif
392
1da177e4
LT
393static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
394{
395 struct stat tmp;
396
932aba1e
MP
397 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
398 return -EOVERFLOW;
399 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
1da177e4 400 return -EOVERFLOW;
a52dd971
LT
401#if BITS_PER_LONG == 32
402 if (stat->size > MAX_NON_LFS)
1da177e4
LT
403 return -EOVERFLOW;
404#endif
405
8529f613 406 INIT_STRUCT_STAT_PADDING(tmp);
932aba1e 407 tmp.st_dev = new_encode_dev(stat->dev);
1da177e4 408 tmp.st_ino = stat->ino;
afefdbb2
DH
409 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
410 return -EOVERFLOW;
1da177e4
LT
411 tmp.st_mode = stat->mode;
412 tmp.st_nlink = stat->nlink;
413 if (tmp.st_nlink != stat->nlink)
414 return -EOVERFLOW;
a7c1938e
EB
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));
932aba1e 417 tmp.st_rdev = new_encode_dev(stat->rdev);
1da177e4
LT
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;
426#endif
427 tmp.st_blocks = stat->blocks;
428 tmp.st_blksize = stat->blksize;
429 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
430}
431
c7887325
DH
432SYSCALL_DEFINE2(newstat, const char __user *, filename,
433 struct stat __user *, statbuf)
5590ff0d
UD
434{
435 struct kstat stat;
2eae7a18 436 int error = vfs_stat(filename, &stat);
5590ff0d 437
2eae7a18
CH
438 if (error)
439 return error;
440 return cp_new_stat(&stat, statbuf);
5590ff0d
UD
441}
442
c7887325
DH
443SYSCALL_DEFINE2(newlstat, const char __user *, filename,
444 struct stat __user *, statbuf)
1da177e4
LT
445{
446 struct kstat stat;
2eae7a18 447 int error;
1da177e4 448
2eae7a18
CH
449 error = vfs_lstat(filename, &stat);
450 if (error)
451 return error;
1da177e4 452
2eae7a18 453 return cp_new_stat(&stat, statbuf);
1da177e4 454}
5590ff0d 455
2833c28a 456#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
c7887325 457SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
6559eed8 458 struct stat __user *, statbuf, int, flag)
1da177e4
LT
459{
460 struct kstat stat;
0112fc22 461 int error;
1da177e4 462
0112fc22
OD
463 error = vfs_fstatat(dfd, filename, &stat, flag);
464 if (error)
465 return error;
466 return cp_new_stat(&stat, statbuf);
1da177e4 467}
cff2b760 468#endif
5590ff0d 469
257ac264 470SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4
LT
471{
472 struct kstat stat;
473 int error = vfs_fstat(fd, &stat);
474
475 if (!error)
476 error = cp_new_stat(&stat, statbuf);
477
478 return error;
479}
82b355d1 480#endif
1da177e4 481
2dae0248
DB
482static int do_readlinkat(int dfd, const char __user *pathname,
483 char __user *buf, int bufsiz)
1da177e4 484{
2d8f3038 485 struct path path;
1da177e4 486 int error;
1fa1e7f6 487 int empty = 0;
7955119e 488 unsigned int lookup_flags = LOOKUP_EMPTY;
1da177e4
LT
489
490 if (bufsiz <= 0)
491 return -EINVAL;
492
7955119e
JL
493retry:
494 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
1da177e4 495 if (!error) {
bb668734 496 struct inode *inode = d_backing_inode(path.dentry);
1da177e4 497
1fa1e7f6 498 error = empty ? -ENOENT : -EINVAL;
fd4a0edf
MS
499 /*
500 * AFS mountpoints allow readlink(2) but are not symlinks
501 */
502 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
2d8f3038 503 error = security_inode_readlink(path.dentry);
1da177e4 504 if (!error) {
68ac1234 505 touch_atime(&path);
fd4a0edf 506 error = vfs_readlink(path.dentry, buf, bufsiz);
1da177e4
LT
507 }
508 }
2d8f3038 509 path_put(&path);
7955119e
JL
510 if (retry_estale(error, lookup_flags)) {
511 lookup_flags |= LOOKUP_REVAL;
512 goto retry;
513 }
1da177e4
LT
514 }
515 return error;
516}
517
2dae0248
DB
518SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
519 char __user *, buf, int, bufsiz)
520{
521 return do_readlinkat(dfd, pathname, buf, bufsiz);
522}
523
002c8976
HC
524SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
525 int, bufsiz)
5590ff0d 526{
2dae0248 527 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
5590ff0d
UD
528}
529
1da177e4
LT
530
531/* ---------- LFS-64 ----------- */
0753f70f 532#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
1da177e4 533
8529f613
LT
534#ifndef INIT_STRUCT_STAT64_PADDING
535# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
536#endif
537
1da177e4
LT
538static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
539{
540 struct stat64 tmp;
541
8529f613 542 INIT_STRUCT_STAT64_PADDING(tmp);
1da177e4
LT
543#ifdef CONFIG_MIPS
544 /* mips has weird padding, so we don't get 64 bits there */
1da177e4
LT
545 tmp.st_dev = new_encode_dev(stat->dev);
546 tmp.st_rdev = new_encode_dev(stat->rdev);
547#else
548 tmp.st_dev = huge_encode_dev(stat->dev);
549 tmp.st_rdev = huge_encode_dev(stat->rdev);
550#endif
551 tmp.st_ino = stat->ino;
afefdbb2
DH
552 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
553 return -EOVERFLOW;
1da177e4
LT
554#ifdef STAT64_HAS_BROKEN_ST_INO
555 tmp.__st_ino = stat->ino;
556#endif
557 tmp.st_mode = stat->mode;
558 tmp.st_nlink = stat->nlink;
a7c1938e
EB
559 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
560 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4
LT
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;
571}
572
c7887325
DH
573SYSCALL_DEFINE2(stat64, const char __user *, filename,
574 struct stat64 __user *, statbuf)
1da177e4
LT
575{
576 struct kstat stat;
577 int error = vfs_stat(filename, &stat);
578
579 if (!error)
580 error = cp_new_stat64(&stat, statbuf);
581
582 return error;
583}
257ac264 584
c7887325
DH
585SYSCALL_DEFINE2(lstat64, const char __user *, filename,
586 struct stat64 __user *, statbuf)
1da177e4
LT
587{
588 struct kstat stat;
589 int error = vfs_lstat(filename, &stat);
590
591 if (!error)
592 error = cp_new_stat64(&stat, statbuf);
593
594 return error;
595}
257ac264
HC
596
597SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4
LT
598{
599 struct kstat stat;
600 int error = vfs_fstat(fd, &stat);
601
602 if (!error)
603 error = cp_new_stat64(&stat, statbuf);
604
605 return error;
606}
607
c7887325 608SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
6559eed8 609 struct stat64 __user *, statbuf, int, flag)
cff2b760
UD
610{
611 struct kstat stat;
0112fc22 612 int error;
cff2b760 613
0112fc22
OD
614 error = vfs_fstatat(dfd, filename, &stat, flag);
615 if (error)
616 return error;
617 return cp_new_stat64(&stat, statbuf);
cff2b760 618}
0753f70f 619#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
1da177e4 620
6f88cc17 621static noinline_for_stack int
64bd7204 622cp_statx(const struct kstat *stat, struct statx __user *buffer)
a528d35e 623{
64bd7204
EB
624 struct statx tmp;
625
626 memset(&tmp, 0, sizeof(tmp));
627
a1175d6b
JL
628 /* STATX_CHANGE_COOKIE is kernel-only for now */
629 tmp.stx_mask = stat->result_mask & ~STATX_CHANGE_COOKIE;
64bd7204 630 tmp.stx_blksize = stat->blksize;
a1175d6b
JL
631 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
632 tmp.stx_attributes = stat->attributes & ~STATX_ATTR_CHANGE_MONOTONIC;
64bd7204
EB
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;
3209f68b 640 tmp.stx_attributes_mask = stat->attributes_mask;
64bd7204
EB
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);
fa2fcf4f 653 tmp.stx_mnt_id = stat->mnt_id;
825cf206
EB
654 tmp.stx_dio_mem_align = stat->dio_mem_align;
655 tmp.stx_dio_offset_align = stat->dio_offset_align;
64bd7204
EB
656
657 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
a528d35e
DH
658}
659
1b6fe6e0 660int do_statx(int dfd, struct filename *filename, unsigned int flags,
0018784f
BM
661 unsigned int mask, struct statx __user *buffer)
662{
663 struct kstat stat;
664 int error;
665
666 if (mask & STATX__RESERVED)
667 return -EINVAL;
668 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
669 return -EINVAL;
670
a1175d6b
JL
671 /* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
672 * from userland.
673 */
674 mask &= ~STATX_CHANGE_COOKIE;
675
0018784f
BM
676 error = vfs_statx(dfd, filename, flags, &stat, mask);
677 if (error)
678 return error;
679
680 return cp_statx(&stat, buffer);
681}
682
a528d35e
DH
683/**
684 * sys_statx - System call to get enhanced stats
685 * @dfd: Base directory to pathwalk from *or* fd to stat.
1e2f82d1 686 * @filename: File to stat or "" with AT_EMPTY_PATH
a528d35e
DH
687 * @flags: AT_* flags to control pathwalk.
688 * @mask: Parts of statx struct actually required.
689 * @buffer: Result buffer.
690 *
1e2f82d1
DH
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.
a528d35e
DH
693 */
694SYSCALL_DEFINE5(statx,
695 int, dfd, const char __user *, filename, unsigned, flags,
696 unsigned int, mask,
697 struct statx __user *, buffer)
698{
1b6fe6e0
SR
699 int ret;
700 struct filename *name;
701
702 name = getname_flags(filename, getname_statx_lookup_flags(flags), NULL);
703 ret = do_statx(dfd, name, flags, mask, buffer);
704 putname(name);
705
706 return ret;
a528d35e
DH
707}
708
f18ed30d 709#if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
ac565de3
AV
710static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
711{
712 struct compat_stat tmp;
713
932aba1e
MP
714 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
715 return -EOVERFLOW;
716 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
ac565de3
AV
717 return -EOVERFLOW;
718
719 memset(&tmp, 0, sizeof(tmp));
932aba1e 720 tmp.st_dev = new_encode_dev(stat->dev);
ac565de3
AV
721 tmp.st_ino = stat->ino;
722 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
723 return -EOVERFLOW;
724 tmp.st_mode = stat->mode;
725 tmp.st_nlink = stat->nlink;
726 if (tmp.st_nlink != stat->nlink)
727 return -EOVERFLOW;
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));
932aba1e 730 tmp.st_rdev = new_encode_dev(stat->rdev);
ac565de3
AV
731 if ((u64) stat->size > MAX_NON_LFS)
732 return -EOVERFLOW;
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;
743}
744
745COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
746 struct compat_stat __user *, statbuf)
747{
748 struct kstat stat;
749 int error;
750
751 error = vfs_stat(filename, &stat);
752 if (error)
753 return error;
754 return cp_compat_stat(&stat, statbuf);
755}
756
757COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
758 struct compat_stat __user *, statbuf)
759{
760 struct kstat stat;
761 int error;
762
763 error = vfs_lstat(filename, &stat);
764 if (error)
765 return error;
766 return cp_compat_stat(&stat, statbuf);
767}
768
769#ifndef __ARCH_WANT_STAT64
770COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
771 const char __user *, filename,
772 struct compat_stat __user *, statbuf, int, flag)
773{
774 struct kstat stat;
775 int error;
776
777 error = vfs_fstatat(dfd, filename, &stat, flag);
778 if (error)
779 return error;
780 return cp_compat_stat(&stat, statbuf);
781}
782#endif
783
784COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
785 struct compat_stat __user *, statbuf)
786{
787 struct kstat stat;
788 int error = vfs_fstat(fd, &stat);
789
790 if (!error)
791 error = cp_compat_stat(&stat, statbuf);
792 return error;
793}
794#endif
795
b462707e
DM
796/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
797void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4 798{
1da177e4
LT
799 inode->i_blocks += bytes >> 9;
800 bytes &= 511;
801 inode->i_bytes += bytes;
802 if (inode->i_bytes >= 512) {
803 inode->i_blocks++;
804 inode->i_bytes -= 512;
805 }
b462707e 806}
eb315d2a 807EXPORT_SYMBOL(__inode_add_bytes);
b462707e
DM
808
809void inode_add_bytes(struct inode *inode, loff_t bytes)
810{
811 spin_lock(&inode->i_lock);
812 __inode_add_bytes(inode, bytes);
1da177e4
LT
813 spin_unlock(&inode->i_lock);
814}
815
816EXPORT_SYMBOL(inode_add_bytes);
817
1c8924eb 818void __inode_sub_bytes(struct inode *inode, loff_t bytes)
1da177e4 819{
1da177e4
LT
820 inode->i_blocks -= bytes >> 9;
821 bytes &= 511;
822 if (inode->i_bytes < bytes) {
823 inode->i_blocks--;
824 inode->i_bytes += 512;
825 }
826 inode->i_bytes -= bytes;
1c8924eb
JK
827}
828
829EXPORT_SYMBOL(__inode_sub_bytes);
830
831void inode_sub_bytes(struct inode *inode, loff_t bytes)
832{
833 spin_lock(&inode->i_lock);
834 __inode_sub_bytes(inode, bytes);
1da177e4
LT
835 spin_unlock(&inode->i_lock);
836}
837
838EXPORT_SYMBOL(inode_sub_bytes);
839
840loff_t inode_get_bytes(struct inode *inode)
841{
842 loff_t ret;
843
844 spin_lock(&inode->i_lock);
f4a8116a 845 ret = __inode_get_bytes(inode);
1da177e4
LT
846 spin_unlock(&inode->i_lock);
847 return ret;
848}
849
850EXPORT_SYMBOL(inode_get_bytes);
851
852void inode_set_bytes(struct inode *inode, loff_t bytes)
853{
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;
858}
859
860EXPORT_SYMBOL(inode_set_bytes);