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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
630d9c47 8#include <linux/export.h>
1da177e4
LT
9#include <linux/mm.h>
10#include <linux/errno.h>
11#include <linux/file.h>
1da177e4
LT
12#include <linux/highuid.h>
13#include <linux/fs.h>
14#include <linux/namei.h>
15#include <linux/security.h>
5b825c3a 16#include <linux/cred.h>
1da177e4 17#include <linux/syscalls.h>
ba52de12 18#include <linux/pagemap.h>
ac565de3 19#include <linux/compat.h>
1da177e4 20
7c0f6ba6 21#include <linux/uaccess.h>
1da177e4
LT
22#include <asm/unistd.h>
23
a528d35e
DH
24/**
25 * generic_fillattr - Fill in the basic attributes from the inode struct
26 * @inode: Inode to use as the source
27 * @stat: Where to fill in the attributes
28 *
29 * Fill in the basic attributes in the kstat structure from data that's to be
30 * found on the VFS inode structure. This is the default if no getattr inode
31 * operation is supplied.
32 */
1da177e4
LT
33void generic_fillattr(struct inode *inode, struct kstat *stat)
34{
35 stat->dev = inode->i_sb->s_dev;
36 stat->ino = inode->i_ino;
37 stat->mode = inode->i_mode;
38 stat->nlink = inode->i_nlink;
39 stat->uid = inode->i_uid;
40 stat->gid = inode->i_gid;
41 stat->rdev = inode->i_rdev;
3ddcd056 42 stat->size = i_size_read(inode);
1da177e4
LT
43 stat->atime = inode->i_atime;
44 stat->mtime = inode->i_mtime;
45 stat->ctime = inode->i_ctime;
93407472 46 stat->blksize = i_blocksize(inode);
3ddcd056 47 stat->blocks = inode->i_blocks;
1da177e4 48
a528d35e
DH
49 if (IS_NOATIME(inode))
50 stat->result_mask &= ~STATX_ATIME;
51 if (IS_AUTOMOUNT(inode))
52 stat->attributes |= STATX_ATTR_AUTOMOUNT;
53}
1da177e4
LT
54EXPORT_SYMBOL(generic_fillattr);
55
b7a6ec52
BF
56/**
57 * vfs_getattr_nosec - getattr without security checks
58 * @path: file to get attributes from
59 * @stat: structure to return attributes in
a528d35e
DH
60 * @request_mask: STATX_xxx flags indicating what the caller wants
61 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
b7a6ec52
BF
62 *
63 * Get attributes without calling security_inode_getattr.
64 *
65 * Currently the only caller other than vfs_getattr is internal to the
a528d35e
DH
66 * filehandle lookup code, which uses only the inode number and returns no
67 * attributes to any user. Any other code probably wants vfs_getattr.
b7a6ec52 68 */
a528d35e
DH
69int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
70 u32 request_mask, unsigned int query_flags)
1da177e4 71{
bb668734 72 struct inode *inode = d_backing_inode(path->dentry);
1da177e4 73
a528d35e
DH
74 memset(stat, 0, sizeof(*stat));
75 stat->result_mask |= STATX_BASIC_STATS;
76 request_mask &= STATX_ALL;
77 query_flags &= KSTAT_QUERY_FLAGS;
1da177e4 78 if (inode->i_op->getattr)
a528d35e
DH
79 return inode->i_op->getattr(path, stat, request_mask,
80 query_flags);
1da177e4
LT
81
82 generic_fillattr(inode, stat);
1da177e4
LT
83 return 0;
84}
b7a6ec52
BF
85EXPORT_SYMBOL(vfs_getattr_nosec);
86
a528d35e
DH
87/*
88 * vfs_getattr - Get the enhanced basic attributes of a file
89 * @path: The file of interest
90 * @stat: Where to return the statistics
91 * @request_mask: STATX_xxx flags indicating what the caller wants
92 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
93 *
94 * Ask the filesystem for a file's attributes. The caller must indicate in
95 * request_mask and query_flags to indicate what they want.
96 *
97 * If the file is remote, the filesystem can be forced to update the attributes
98 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
99 * suppress the update by passing AT_STATX_DONT_SYNC.
100 *
101 * Bits must have been set in request_mask to indicate which attributes the
102 * caller wants retrieving. Any such attribute not requested may be returned
103 * anyway, but the value may be approximate, and, if remote, may not have been
104 * synchronised with the server.
105 *
106 * 0 will be returned on success, and a -ve error code if unsuccessful.
107 */
108int vfs_getattr(const struct path *path, struct kstat *stat,
109 u32 request_mask, unsigned int query_flags)
b7a6ec52
BF
110{
111 int retval;
112
3f7036a0 113 retval = security_inode_getattr(path);
b7a6ec52
BF
114 if (retval)
115 return retval;
a528d35e 116 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
b7a6ec52 117}
1da177e4
LT
118EXPORT_SYMBOL(vfs_getattr);
119
a528d35e
DH
120/**
121 * vfs_statx_fd - Get the enhanced basic attributes by file descriptor
122 * @fd: The file descriptor referring to the file of interest
123 * @stat: The result structure to fill in.
124 * @request_mask: STATX_xxx flags indicating what the caller wants
125 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
126 *
127 * This function is a wrapper around vfs_getattr(). The main difference is
128 * that it uses a file descriptor to determine the file location.
129 *
130 * 0 will be returned on success, and a -ve error code if unsuccessful.
131 */
132int vfs_statx_fd(unsigned int fd, struct kstat *stat,
133 u32 request_mask, unsigned int query_flags)
1da177e4 134{
8c7493aa 135 struct fd f;
1da177e4
LT
136 int error = -EBADF;
137
8c7493aa
EB
138 if (query_flags & ~KSTAT_QUERY_FLAGS)
139 return -EINVAL;
140
141 f = fdget_raw(fd);
2903ff01 142 if (f.file) {
a528d35e
DH
143 error = vfs_getattr(&f.file->f_path, stat,
144 request_mask, query_flags);
2903ff01 145 fdput(f);
1da177e4
LT
146 }
147 return error;
148}
a528d35e 149EXPORT_SYMBOL(vfs_statx_fd);
1da177e4 150
a528d35e
DH
151/**
152 * vfs_statx - Get basic and extra attributes by filename
153 * @dfd: A file descriptor representing the base dir for a relative filename
154 * @filename: The name of the file of interest
155 * @flags: Flags to control the query
156 * @stat: The result structure to fill in.
157 * @request_mask: STATX_xxx flags indicating what the caller wants
158 *
159 * This function is a wrapper around vfs_getattr(). The main difference is
160 * that it uses a filename and base directory to determine the file location.
161 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
162 * at the given name from being referenced.
163 *
a528d35e
DH
164 * 0 will be returned on success, and a -ve error code if unsuccessful.
165 */
166int vfs_statx(int dfd, const char __user *filename, int flags,
167 struct kstat *stat, u32 request_mask)
0112fc22 168{
2eae7a18 169 struct path path;
0112fc22 170 int error = -EINVAL;
a528d35e 171 unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
0112fc22 172
a528d35e
DH
173 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
174 AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)
175 return -EINVAL;
0112fc22 176
a528d35e
DH
177 if (flags & AT_SYMLINK_NOFOLLOW)
178 lookup_flags &= ~LOOKUP_FOLLOW;
179 if (flags & AT_NO_AUTOMOUNT)
180 lookup_flags &= ~LOOKUP_AUTOMOUNT;
181 if (flags & AT_EMPTY_PATH)
65cfc672 182 lookup_flags |= LOOKUP_EMPTY;
a528d35e 183
836fb7e7 184retry:
2eae7a18
CH
185 error = user_path_at(dfd, filename, lookup_flags, &path);
186 if (error)
187 goto out;
188
a528d35e 189 error = vfs_getattr(&path, stat, request_mask, flags);
2eae7a18 190 path_put(&path);
836fb7e7
JL
191 if (retry_estale(error, lookup_flags)) {
192 lookup_flags |= LOOKUP_REVAL;
193 goto retry;
194 }
0112fc22
OD
195out:
196 return error;
197}
a528d35e 198EXPORT_SYMBOL(vfs_statx);
2eae7a18 199
0112fc22 200
1da177e4
LT
201#ifdef __ARCH_WANT_OLD_STAT
202
203/*
204 * For backward compatibility? Maybe this should be moved
205 * into arch/i386 instead?
206 */
207static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
208{
209 static int warncount = 5;
210 struct __old_kernel_stat tmp;
a528d35e 211
1da177e4
LT
212 if (warncount > 0) {
213 warncount--;
214 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
215 current->comm);
216 } else if (warncount < 0) {
217 /* it's laughable, but... */
218 warncount = 0;
219 }
220
221 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
222 tmp.st_dev = old_encode_dev(stat->dev);
223 tmp.st_ino = stat->ino;
afefdbb2
DH
224 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
225 return -EOVERFLOW;
1da177e4
LT
226 tmp.st_mode = stat->mode;
227 tmp.st_nlink = stat->nlink;
228 if (tmp.st_nlink != stat->nlink)
229 return -EOVERFLOW;
a7c1938e
EB
230 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
231 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
1da177e4
LT
232 tmp.st_rdev = old_encode_dev(stat->rdev);
233#if BITS_PER_LONG == 32
234 if (stat->size > MAX_NON_LFS)
235 return -EOVERFLOW;
a528d35e 236#endif
1da177e4
LT
237 tmp.st_size = stat->size;
238 tmp.st_atime = stat->atime.tv_sec;
239 tmp.st_mtime = stat->mtime.tv_sec;
240 tmp.st_ctime = stat->ctime.tv_sec;
241 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
242}
243
c7887325
DH
244SYSCALL_DEFINE2(stat, const char __user *, filename,
245 struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
246{
247 struct kstat stat;
2eae7a18 248 int error;
1da177e4 249
2eae7a18
CH
250 error = vfs_stat(filename, &stat);
251 if (error)
252 return error;
1da177e4 253
2eae7a18 254 return cp_old_stat(&stat, statbuf);
1da177e4 255}
257ac264 256
c7887325
DH
257SYSCALL_DEFINE2(lstat, const char __user *, filename,
258 struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
259{
260 struct kstat stat;
2eae7a18 261 int error;
1da177e4 262
2eae7a18
CH
263 error = vfs_lstat(filename, &stat);
264 if (error)
265 return error;
1da177e4 266
2eae7a18 267 return cp_old_stat(&stat, statbuf);
1da177e4 268}
257ac264
HC
269
270SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4
LT
271{
272 struct kstat stat;
273 int error = vfs_fstat(fd, &stat);
274
275 if (!error)
276 error = cp_old_stat(&stat, statbuf);
277
278 return error;
279}
280
281#endif /* __ARCH_WANT_OLD_STAT */
282
a52dd971
LT
283#if BITS_PER_LONG == 32
284# define choose_32_64(a,b) a
285#else
286# define choose_32_64(a,b) b
287#endif
288
4c416f42 289#define valid_dev(x) choose_32_64(old_valid_dev(x),true)
a52dd971
LT
290#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
291
8529f613
LT
292#ifndef INIT_STRUCT_STAT_PADDING
293# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
294#endif
295
1da177e4
LT
296static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
297{
298 struct stat tmp;
299
a52dd971 300 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
1da177e4 301 return -EOVERFLOW;
a52dd971
LT
302#if BITS_PER_LONG == 32
303 if (stat->size > MAX_NON_LFS)
1da177e4
LT
304 return -EOVERFLOW;
305#endif
306
8529f613 307 INIT_STRUCT_STAT_PADDING(tmp);
a52dd971 308 tmp.st_dev = encode_dev(stat->dev);
1da177e4 309 tmp.st_ino = stat->ino;
afefdbb2
DH
310 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
311 return -EOVERFLOW;
1da177e4
LT
312 tmp.st_mode = stat->mode;
313 tmp.st_nlink = stat->nlink;
314 if (tmp.st_nlink != stat->nlink)
315 return -EOVERFLOW;
a7c1938e
EB
316 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
317 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
a52dd971 318 tmp.st_rdev = encode_dev(stat->rdev);
1da177e4
LT
319 tmp.st_size = stat->size;
320 tmp.st_atime = stat->atime.tv_sec;
321 tmp.st_mtime = stat->mtime.tv_sec;
322 tmp.st_ctime = stat->ctime.tv_sec;
323#ifdef STAT_HAVE_NSEC
324 tmp.st_atime_nsec = stat->atime.tv_nsec;
325 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
326 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
327#endif
328 tmp.st_blocks = stat->blocks;
329 tmp.st_blksize = stat->blksize;
330 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
331}
332
c7887325
DH
333SYSCALL_DEFINE2(newstat, const char __user *, filename,
334 struct stat __user *, statbuf)
5590ff0d
UD
335{
336 struct kstat stat;
2eae7a18 337 int error = vfs_stat(filename, &stat);
5590ff0d 338
2eae7a18
CH
339 if (error)
340 return error;
341 return cp_new_stat(&stat, statbuf);
5590ff0d
UD
342}
343
c7887325
DH
344SYSCALL_DEFINE2(newlstat, const char __user *, filename,
345 struct stat __user *, statbuf)
1da177e4
LT
346{
347 struct kstat stat;
2eae7a18 348 int error;
1da177e4 349
2eae7a18
CH
350 error = vfs_lstat(filename, &stat);
351 if (error)
352 return error;
1da177e4 353
2eae7a18 354 return cp_new_stat(&stat, statbuf);
1da177e4 355}
5590ff0d 356
2833c28a 357#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
c7887325 358SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
6559eed8 359 struct stat __user *, statbuf, int, flag)
1da177e4
LT
360{
361 struct kstat stat;
0112fc22 362 int error;
1da177e4 363
0112fc22
OD
364 error = vfs_fstatat(dfd, filename, &stat, flag);
365 if (error)
366 return error;
367 return cp_new_stat(&stat, statbuf);
1da177e4 368}
cff2b760 369#endif
5590ff0d 370
257ac264 371SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4
LT
372{
373 struct kstat stat;
374 int error = vfs_fstat(fd, &stat);
375
376 if (!error)
377 error = cp_new_stat(&stat, statbuf);
378
379 return error;
380}
381
2dae0248
DB
382static int do_readlinkat(int dfd, const char __user *pathname,
383 char __user *buf, int bufsiz)
1da177e4 384{
2d8f3038 385 struct path path;
1da177e4 386 int error;
1fa1e7f6 387 int empty = 0;
7955119e 388 unsigned int lookup_flags = LOOKUP_EMPTY;
1da177e4
LT
389
390 if (bufsiz <= 0)
391 return -EINVAL;
392
7955119e
JL
393retry:
394 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
1da177e4 395 if (!error) {
bb668734 396 struct inode *inode = d_backing_inode(path.dentry);
1da177e4 397
1fa1e7f6 398 error = empty ? -ENOENT : -EINVAL;
fd4a0edf
MS
399 /*
400 * AFS mountpoints allow readlink(2) but are not symlinks
401 */
402 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
2d8f3038 403 error = security_inode_readlink(path.dentry);
1da177e4 404 if (!error) {
68ac1234 405 touch_atime(&path);
fd4a0edf 406 error = vfs_readlink(path.dentry, buf, bufsiz);
1da177e4
LT
407 }
408 }
2d8f3038 409 path_put(&path);
7955119e
JL
410 if (retry_estale(error, lookup_flags)) {
411 lookup_flags |= LOOKUP_REVAL;
412 goto retry;
413 }
1da177e4
LT
414 }
415 return error;
416}
417
2dae0248
DB
418SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
419 char __user *, buf, int, bufsiz)
420{
421 return do_readlinkat(dfd, pathname, buf, bufsiz);
422}
423
002c8976
HC
424SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
425 int, bufsiz)
5590ff0d 426{
2dae0248 427 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
5590ff0d
UD
428}
429
1da177e4
LT
430
431/* ---------- LFS-64 ----------- */
0753f70f 432#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
1da177e4 433
8529f613
LT
434#ifndef INIT_STRUCT_STAT64_PADDING
435# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
436#endif
437
1da177e4
LT
438static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
439{
440 struct stat64 tmp;
441
8529f613 442 INIT_STRUCT_STAT64_PADDING(tmp);
1da177e4
LT
443#ifdef CONFIG_MIPS
444 /* mips has weird padding, so we don't get 64 bits there */
1da177e4
LT
445 tmp.st_dev = new_encode_dev(stat->dev);
446 tmp.st_rdev = new_encode_dev(stat->rdev);
447#else
448 tmp.st_dev = huge_encode_dev(stat->dev);
449 tmp.st_rdev = huge_encode_dev(stat->rdev);
450#endif
451 tmp.st_ino = stat->ino;
afefdbb2
DH
452 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
453 return -EOVERFLOW;
1da177e4
LT
454#ifdef STAT64_HAS_BROKEN_ST_INO
455 tmp.__st_ino = stat->ino;
456#endif
457 tmp.st_mode = stat->mode;
458 tmp.st_nlink = stat->nlink;
a7c1938e
EB
459 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
460 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4
LT
461 tmp.st_atime = stat->atime.tv_sec;
462 tmp.st_atime_nsec = stat->atime.tv_nsec;
463 tmp.st_mtime = stat->mtime.tv_sec;
464 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
465 tmp.st_ctime = stat->ctime.tv_sec;
466 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
467 tmp.st_size = stat->size;
468 tmp.st_blocks = stat->blocks;
469 tmp.st_blksize = stat->blksize;
470 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
471}
472
c7887325
DH
473SYSCALL_DEFINE2(stat64, const char __user *, filename,
474 struct stat64 __user *, statbuf)
1da177e4
LT
475{
476 struct kstat stat;
477 int error = vfs_stat(filename, &stat);
478
479 if (!error)
480 error = cp_new_stat64(&stat, statbuf);
481
482 return error;
483}
257ac264 484
c7887325
DH
485SYSCALL_DEFINE2(lstat64, const char __user *, filename,
486 struct stat64 __user *, statbuf)
1da177e4
LT
487{
488 struct kstat stat;
489 int error = vfs_lstat(filename, &stat);
490
491 if (!error)
492 error = cp_new_stat64(&stat, statbuf);
493
494 return error;
495}
257ac264
HC
496
497SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4
LT
498{
499 struct kstat stat;
500 int error = vfs_fstat(fd, &stat);
501
502 if (!error)
503 error = cp_new_stat64(&stat, statbuf);
504
505 return error;
506}
507
c7887325 508SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
6559eed8 509 struct stat64 __user *, statbuf, int, flag)
cff2b760
UD
510{
511 struct kstat stat;
0112fc22 512 int error;
cff2b760 513
0112fc22
OD
514 error = vfs_fstatat(dfd, filename, &stat, flag);
515 if (error)
516 return error;
517 return cp_new_stat64(&stat, statbuf);
cff2b760 518}
0753f70f 519#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
1da177e4 520
64bd7204
EB
521static noinline_for_stack int
522cp_statx(const struct kstat *stat, struct statx __user *buffer)
a528d35e 523{
64bd7204
EB
524 struct statx tmp;
525
526 memset(&tmp, 0, sizeof(tmp));
527
528 tmp.stx_mask = stat->result_mask;
529 tmp.stx_blksize = stat->blksize;
530 tmp.stx_attributes = stat->attributes;
531 tmp.stx_nlink = stat->nlink;
532 tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
533 tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
534 tmp.stx_mode = stat->mode;
535 tmp.stx_ino = stat->ino;
536 tmp.stx_size = stat->size;
537 tmp.stx_blocks = stat->blocks;
3209f68b 538 tmp.stx_attributes_mask = stat->attributes_mask;
64bd7204
EB
539 tmp.stx_atime.tv_sec = stat->atime.tv_sec;
540 tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
541 tmp.stx_btime.tv_sec = stat->btime.tv_sec;
542 tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
543 tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
544 tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
545 tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
546 tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
547 tmp.stx_rdev_major = MAJOR(stat->rdev);
548 tmp.stx_rdev_minor = MINOR(stat->rdev);
549 tmp.stx_dev_major = MAJOR(stat->dev);
550 tmp.stx_dev_minor = MINOR(stat->dev);
551
552 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
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553}
554
555/**
556 * sys_statx - System call to get enhanced stats
557 * @dfd: Base directory to pathwalk from *or* fd to stat.
1e2f82d1 558 * @filename: File to stat or "" with AT_EMPTY_PATH
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559 * @flags: AT_* flags to control pathwalk.
560 * @mask: Parts of statx struct actually required.
561 * @buffer: Result buffer.
562 *
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563 * Note that fstat() can be emulated by setting dfd to the fd of interest,
564 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
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565 */
566SYSCALL_DEFINE5(statx,
567 int, dfd, const char __user *, filename, unsigned, flags,
568 unsigned int, mask,
569 struct statx __user *, buffer)
570{
571 struct kstat stat;
572 int error;
573
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574 if (mask & STATX__RESERVED)
575 return -EINVAL;
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576 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
577 return -EINVAL;
a528d35e 578
1e2f82d1 579 error = vfs_statx(dfd, filename, flags, &stat, mask);
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580 if (error)
581 return error;
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582
583 return cp_statx(&stat, buffer);
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584}
585
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586#ifdef CONFIG_COMPAT
587static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
588{
589 struct compat_stat tmp;
590
591 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
592 return -EOVERFLOW;
593
594 memset(&tmp, 0, sizeof(tmp));
595 tmp.st_dev = old_encode_dev(stat->dev);
596 tmp.st_ino = stat->ino;
597 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
598 return -EOVERFLOW;
599 tmp.st_mode = stat->mode;
600 tmp.st_nlink = stat->nlink;
601 if (tmp.st_nlink != stat->nlink)
602 return -EOVERFLOW;
603 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
604 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
605 tmp.st_rdev = old_encode_dev(stat->rdev);
606 if ((u64) stat->size > MAX_NON_LFS)
607 return -EOVERFLOW;
608 tmp.st_size = stat->size;
609 tmp.st_atime = stat->atime.tv_sec;
610 tmp.st_atime_nsec = stat->atime.tv_nsec;
611 tmp.st_mtime = stat->mtime.tv_sec;
612 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
613 tmp.st_ctime = stat->ctime.tv_sec;
614 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
615 tmp.st_blocks = stat->blocks;
616 tmp.st_blksize = stat->blksize;
617 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
618}
619
620COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
621 struct compat_stat __user *, statbuf)
622{
623 struct kstat stat;
624 int error;
625
626 error = vfs_stat(filename, &stat);
627 if (error)
628 return error;
629 return cp_compat_stat(&stat, statbuf);
630}
631
632COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
633 struct compat_stat __user *, statbuf)
634{
635 struct kstat stat;
636 int error;
637
638 error = vfs_lstat(filename, &stat);
639 if (error)
640 return error;
641 return cp_compat_stat(&stat, statbuf);
642}
643
644#ifndef __ARCH_WANT_STAT64
645COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
646 const char __user *, filename,
647 struct compat_stat __user *, statbuf, int, flag)
648{
649 struct kstat stat;
650 int error;
651
652 error = vfs_fstatat(dfd, filename, &stat, flag);
653 if (error)
654 return error;
655 return cp_compat_stat(&stat, statbuf);
656}
657#endif
658
659COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
660 struct compat_stat __user *, statbuf)
661{
662 struct kstat stat;
663 int error = vfs_fstat(fd, &stat);
664
665 if (!error)
666 error = cp_compat_stat(&stat, statbuf);
667 return error;
668}
669#endif
670
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671/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
672void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4 673{
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674 inode->i_blocks += bytes >> 9;
675 bytes &= 511;
676 inode->i_bytes += bytes;
677 if (inode->i_bytes >= 512) {
678 inode->i_blocks++;
679 inode->i_bytes -= 512;
680 }
b462707e 681}
eb315d2a 682EXPORT_SYMBOL(__inode_add_bytes);
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683
684void inode_add_bytes(struct inode *inode, loff_t bytes)
685{
686 spin_lock(&inode->i_lock);
687 __inode_add_bytes(inode, bytes);
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688 spin_unlock(&inode->i_lock);
689}
690
691EXPORT_SYMBOL(inode_add_bytes);
692
1c8924eb 693void __inode_sub_bytes(struct inode *inode, loff_t bytes)
1da177e4 694{
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695 inode->i_blocks -= bytes >> 9;
696 bytes &= 511;
697 if (inode->i_bytes < bytes) {
698 inode->i_blocks--;
699 inode->i_bytes += 512;
700 }
701 inode->i_bytes -= bytes;
1c8924eb
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702}
703
704EXPORT_SYMBOL(__inode_sub_bytes);
705
706void inode_sub_bytes(struct inode *inode, loff_t bytes)
707{
708 spin_lock(&inode->i_lock);
709 __inode_sub_bytes(inode, bytes);
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710 spin_unlock(&inode->i_lock);
711}
712
713EXPORT_SYMBOL(inode_sub_bytes);
714
715loff_t inode_get_bytes(struct inode *inode)
716{
717 loff_t ret;
718
719 spin_lock(&inode->i_lock);
f4a8116a 720 ret = __inode_get_bytes(inode);
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721 spin_unlock(&inode->i_lock);
722 return ret;
723}
724
725EXPORT_SYMBOL(inode_get_bytes);
726
727void inode_set_bytes(struct inode *inode, loff_t bytes)
728{
729 /* Caller is here responsible for sufficient locking
730 * (ie. inode->i_lock) */
731 inode->i_blocks = bytes >> 9;
732 inode->i_bytes = bytes & 511;
733}
734
735EXPORT_SYMBOL(inode_set_bytes);