fs/stat.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/fs/stat.c
   4  *
   5  *  Copyright (C) 1991, 1992  Linus Torvalds
   6  */
   7
   8 #include <linux/export.h>
   9 #include <linux/mm.h>
  10 #include <linux/errno.h>
  11 #include <linux/file.h>
  12 #include <linux/highuid.h>
  13 #include <linux/fs.h>
  14 #include <linux/namei.h>
  15 #include <linux/security.h>
  16 #include <linux/cred.h>
  17 #include <linux/syscalls.h>
  18 #include <linux/pagemap.h>
  19 #include <linux/compat.h>
  20
  21 #include <linux/uaccess.h>
  22 #include <asm/unistd.h>
  23
  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  */
  33 void 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;
  42         stat->size = i_size_read(inode);
  43         stat->atime = inode->i_atime;
  44         stat->mtime = inode->i_mtime;
  45         stat->ctime = inode->i_ctime;
  46         stat->blksize = i_blocksize(inode);
  47         stat->blocks = inode->i_blocks;
  48
  49         if (IS_NOATIME(inode))
  50                 stat->result_mask &= ~STATX_ATIME;
  51         if (IS_AUTOMOUNT(inode))
  52                 stat->attributes |= STATX_ATTR_AUTOMOUNT;
  53 }
  54 EXPORT_SYMBOL(generic_fillattr);
  55
  56 /**
  57  * vfs_getattr_nosec - getattr without security checks
  58  * @path: file to get attributes from
  59  * @stat: structure to return attributes in
  60  * @request_mask: STATX_xxx flags indicating what the caller wants
  61  * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
  62  *
  63  * Get attributes without calling security_inode_getattr.
  64  *
  65  * Currently the only caller other than vfs_getattr is internal to the
  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.
  68  */
  69 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
  70                       u32 request_mask, unsigned int query_flags)
  71 {
  72         struct inode *inode = d_backing_inode(path->dentry);
  73
  74         memset(stat, 0, sizeof(*stat));
  75         stat->result_mask |= STATX_BASIC_STATS;
  76         request_mask &= STATX_ALL;
  77         query_flags &= KSTAT_QUERY_FLAGS;
  78         if (inode->i_op->getattr)
  79                 return inode->i_op->getattr(path, stat, request_mask,
  80                                             query_flags);
  81
  82         generic_fillattr(inode, stat);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL(vfs_getattr_nosec);
  86
  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  */
 108 int vfs_getattr(const struct path *path, struct kstat *stat,
 109                 u32 request_mask, unsigned int query_flags)
 110 {
 111         int retval;
 112
 113         retval = security_inode_getattr(path);
 114         if (retval)
 115                 return retval;
 116         return vfs_getattr_nosec(path, stat, request_mask, query_flags);
 117 }
 118 EXPORT_SYMBOL(vfs_getattr);
 119
 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  */
 132 int vfs_statx_fd(unsigned int fd, struct kstat *stat,
 133                  u32 request_mask, unsigned int query_flags)
 134 {
 135         struct fd f;
 136         int error = -EBADF;
 137
 138         if (query_flags & ~KSTAT_QUERY_FLAGS)
 139                 return -EINVAL;
 140
 141         f = fdget_raw(fd);
 142         if (f.file) {
 143                 error = vfs_getattr(&f.file->f_path, stat,
 144                                     request_mask, query_flags);
 145                 fdput(f);
 146         }
 147         return error;
 148 }
 149 EXPORT_SYMBOL(vfs_statx_fd);
 150
 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  *
 164  * 0 will be returned on success, and a -ve error code if unsuccessful.
 165  */
 166 int vfs_statx(int dfd, const char __user *filename, int flags,
 167               struct kstat *stat, u32 request_mask)
 168 {
 169         struct path path;
 170         int error = -EINVAL;
 171         unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
 172
 173         if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
 174                        AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)
 175                 return -EINVAL;
 176
 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)
 182                 lookup_flags |= LOOKUP_EMPTY;
 183
 184 retry:
 185         error = user_path_at(dfd, filename, lookup_flags, &path);
 186         if (error)
 187                 goto out;
 188
 189         error = vfs_getattr(&path, stat, request_mask, flags);
 190         path_put(&path);
 191         if (retry_estale(error, lookup_flags)) {
 192                 lookup_flags |= LOOKUP_REVAL;
 193                 goto retry;
 194         }
 195 out:
 196         return error;
 197 }
 198 EXPORT_SYMBOL(vfs_statx);
 199
 200
 201 #ifdef __ARCH_WANT_OLD_STAT
 202
 203 /*
 204  * For backward compatibility?  Maybe this should be moved
 205  * into arch/i386 instead?
 206  */
 207 static 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;
 211
 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;
 224         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
 225                 return -EOVERFLOW;
 226         tmp.st_mode = stat->mode;
 227         tmp.st_nlink = stat->nlink;
 228         if (tmp.st_nlink != stat->nlink)
 229                 return -EOVERFLOW;
 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));
 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;
 236 #endif
 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
 244 SYSCALL_DEFINE2(stat, const char __user *, filename,
 245                 struct __old_kernel_stat __user *, statbuf)
 246 {
 247         struct kstat stat;
 248         int error;
 249
 250         error = vfs_stat(filename, &stat);
 251         if (error)
 252                 return error;
 253
 254         return cp_old_stat(&stat, statbuf);
 255 }
 256
 257 SYSCALL_DEFINE2(lstat, const char __user *, filename,
 258                 struct __old_kernel_stat __user *, statbuf)
 259 {
 260         struct kstat stat;
 261         int error;
 262
 263         error = vfs_lstat(filename, &stat);
 264         if (error)
 265                 return error;
 266
 267         return cp_old_stat(&stat, statbuf);
 268 }
 269
 270 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
 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
 283 #ifdef __ARCH_WANT_NEW_STAT
 284
 285 #if BITS_PER_LONG == 32
 286 #  define choose_32_64(a,b) a
 287 #else
 288 #  define choose_32_64(a,b) b
 289 #endif
 290
 291 #define valid_dev(x)  choose_32_64(old_valid_dev(x),true)
 292 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
 293
 294 #ifndef INIT_STRUCT_STAT_PADDING
 295 #  define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
 296 #endif
 297
 298 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
 299 {
 300         struct stat tmp;
 301
 302         if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
 303                 return -EOVERFLOW;
 304 #if BITS_PER_LONG == 32
 305         if (stat->size > MAX_NON_LFS)
 306                 return -EOVERFLOW;
 307 #endif
 308
 309         INIT_STRUCT_STAT_PADDING(tmp);
 310         tmp.st_dev = encode_dev(stat->dev);
 311         tmp.st_ino = stat->ino;
 312         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
 313                 return -EOVERFLOW;
 314         tmp.st_mode = stat->mode;
 315         tmp.st_nlink = stat->nlink;
 316         if (tmp.st_nlink != stat->nlink)
 317                 return -EOVERFLOW;
 318         SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
 319         SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
 320         tmp.st_rdev = encode_dev(stat->rdev);
 321         tmp.st_size = stat->size;
 322         tmp.st_atime = stat->atime.tv_sec;
 323         tmp.st_mtime = stat->mtime.tv_sec;
 324         tmp.st_ctime = stat->ctime.tv_sec;
 325 #ifdef STAT_HAVE_NSEC
 326         tmp.st_atime_nsec = stat->atime.tv_nsec;
 327         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 328         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 329 #endif
 330         tmp.st_blocks = stat->blocks;
 331         tmp.st_blksize = stat->blksize;
 332         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 333 }
 334
 335 SYSCALL_DEFINE2(newstat, const char __user *, filename,
 336                 struct stat __user *, statbuf)
 337 {
 338         struct kstat stat;
 339         int error = vfs_stat(filename, &stat);
 340
 341         if (error)
 342                 return error;
 343         return cp_new_stat(&stat, statbuf);
 344 }
 345
 346 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
 347                 struct stat __user *, statbuf)
 348 {
 349         struct kstat stat;
 350         int error;
 351
 352         error = vfs_lstat(filename, &stat);
 353         if (error)
 354                 return error;
 355
 356         return cp_new_stat(&stat, statbuf);
 357 }
 358
 359 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
 360 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
 361                 struct stat __user *, statbuf, int, flag)
 362 {
 363         struct kstat stat;
 364         int error;
 365
 366         error = vfs_fstatat(dfd, filename, &stat, flag);
 367         if (error)
 368                 return error;
 369         return cp_new_stat(&stat, statbuf);
 370 }
 371 #endif
 372
 373 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
 374 {
 375         struct kstat stat;
 376         int error = vfs_fstat(fd, &stat);
 377
 378         if (!error)
 379                 error = cp_new_stat(&stat, statbuf);
 380
 381         return error;
 382 }
 383 #endif
 384
 385 static int do_readlinkat(int dfd, const char __user *pathname,
 386                          char __user *buf, int bufsiz)
 387 {
 388         struct path path;
 389         int error;
 390         int empty = 0;
 391         unsigned int lookup_flags = LOOKUP_EMPTY;
 392
 393         if (bufsiz <= 0)
 394                 return -EINVAL;
 395
 396 retry:
 397         error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
 398         if (!error) {
 399                 struct inode *inode = d_backing_inode(path.dentry);
 400
 401                 error = empty ? -ENOENT : -EINVAL;
 402                 /*
 403                  * AFS mountpoints allow readlink(2) but are not symlinks
 404                  */
 405                 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
 406                         error = security_inode_readlink(path.dentry);
 407                         if (!error) {
 408                                 touch_atime(&path);
 409                                 error = vfs_readlink(path.dentry, buf, bufsiz);
 410                         }
 411                 }
 412                 path_put(&path);
 413                 if (retry_estale(error, lookup_flags)) {
 414                         lookup_flags |= LOOKUP_REVAL;
 415                         goto retry;
 416                 }
 417         }
 418         return error;
 419 }
 420
 421 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
 422                 char __user *, buf, int, bufsiz)
 423 {
 424         return do_readlinkat(dfd, pathname, buf, bufsiz);
 425 }
 426
 427 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
 428                 int, bufsiz)
 429 {
 430         return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
 431 }
 432
 433
 434 /* ---------- LFS-64 ----------- */
 435 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
 436
 437 #ifndef INIT_STRUCT_STAT64_PADDING
 438 #  define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
 439 #endif
 440
 441 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
 442 {
 443         struct stat64 tmp;
 444
 445         INIT_STRUCT_STAT64_PADDING(tmp);
 446 #ifdef CONFIG_MIPS
 447         /* mips has weird padding, so we don't get 64 bits there */
 448         tmp.st_dev = new_encode_dev(stat->dev);
 449         tmp.st_rdev = new_encode_dev(stat->rdev);
 450 #else
 451         tmp.st_dev = huge_encode_dev(stat->dev);
 452         tmp.st_rdev = huge_encode_dev(stat->rdev);
 453 #endif
 454         tmp.st_ino = stat->ino;
 455         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
 456                 return -EOVERFLOW;
 457 #ifdef STAT64_HAS_BROKEN_ST_INO
 458         tmp.__st_ino = stat->ino;
 459 #endif
 460         tmp.st_mode = stat->mode;
 461         tmp.st_nlink = stat->nlink;
 462         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 463         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 464         tmp.st_atime = stat->atime.tv_sec;
 465         tmp.st_atime_nsec = stat->atime.tv_nsec;
 466         tmp.st_mtime = stat->mtime.tv_sec;
 467         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 468         tmp.st_ctime = stat->ctime.tv_sec;
 469         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 470         tmp.st_size = stat->size;
 471         tmp.st_blocks = stat->blocks;
 472         tmp.st_blksize = stat->blksize;
 473         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 474 }
 475
 476 SYSCALL_DEFINE2(stat64, const char __user *, filename,
 477                 struct stat64 __user *, statbuf)
 478 {
 479         struct kstat stat;
 480         int error = vfs_stat(filename, &stat);
 481
 482         if (!error)
 483                 error = cp_new_stat64(&stat, statbuf);
 484
 485         return error;
 486 }
 487
 488 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
 489                 struct stat64 __user *, statbuf)
 490 {
 491         struct kstat stat;
 492         int error = vfs_lstat(filename, &stat);
 493
 494         if (!error)
 495                 error = cp_new_stat64(&stat, statbuf);
 496
 497         return error;
 498 }
 499
 500 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
 501 {
 502         struct kstat stat;
 503         int error = vfs_fstat(fd, &stat);
 504
 505         if (!error)
 506                 error = cp_new_stat64(&stat, statbuf);
 507
 508         return error;
 509 }
 510
 511 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
 512                 struct stat64 __user *, statbuf, int, flag)
 513 {
 514         struct kstat stat;
 515         int error;
 516
 517         error = vfs_fstatat(dfd, filename, &stat, flag);
 518         if (error)
 519                 return error;
 520         return cp_new_stat64(&stat, statbuf);
 521 }
 522 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
 523
 524 static noinline_for_stack int
 525 cp_statx(const struct kstat *stat, struct statx __user *buffer)
 526 {
 527         struct statx tmp;
 528
 529         memset(&tmp, 0, sizeof(tmp));
 530
 531         tmp.stx_mask = stat->result_mask;
 532         tmp.stx_blksize = stat->blksize;
 533         tmp.stx_attributes = stat->attributes;
 534         tmp.stx_nlink = stat->nlink;
 535         tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
 536         tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
 537         tmp.stx_mode = stat->mode;
 538         tmp.stx_ino = stat->ino;
 539         tmp.stx_size = stat->size;
 540         tmp.stx_blocks = stat->blocks;
 541         tmp.stx_attributes_mask = stat->attributes_mask;
 542         tmp.stx_atime.tv_sec = stat->atime.tv_sec;
 543         tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
 544         tmp.stx_btime.tv_sec = stat->btime.tv_sec;
 545         tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
 546         tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
 547         tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
 548         tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
 549         tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
 550         tmp.stx_rdev_major = MAJOR(stat->rdev);
 551         tmp.stx_rdev_minor = MINOR(stat->rdev);
 552         tmp.stx_dev_major = MAJOR(stat->dev);
 553         tmp.stx_dev_minor = MINOR(stat->dev);
 554
 555         return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
 556 }
 557
 558 /**
 559  * sys_statx - System call to get enhanced stats
 560  * @dfd: Base directory to pathwalk from *or* fd to stat.
 561  * @filename: File to stat or "" with AT_EMPTY_PATH
 562  * @flags: AT_* flags to control pathwalk.
 563  * @mask: Parts of statx struct actually required.
 564  * @buffer: Result buffer.
 565  *
 566  * Note that fstat() can be emulated by setting dfd to the fd of interest,
 567  * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
 568  */
 569 SYSCALL_DEFINE5(statx,
 570                 int, dfd, const char __user *, filename, unsigned, flags,
 571                 unsigned int, mask,
 572                 struct statx __user *, buffer)
 573 {
 574         struct kstat stat;
 575         int error;
 576
 577         if (mask & STATX__RESERVED)
 578                 return -EINVAL;
 579         if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
 580                 return -EINVAL;
 581
 582         error = vfs_statx(dfd, filename, flags, &stat, mask);
 583         if (error)
 584                 return error;
 585
 586         return cp_statx(&stat, buffer);
 587 }
 588
 589 #ifdef CONFIG_COMPAT
 590 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
 591 {
 592         struct compat_stat tmp;
 593
 594         if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
 595                 return -EOVERFLOW;
 596
 597         memset(&tmp, 0, sizeof(tmp));
 598         tmp.st_dev = old_encode_dev(stat->dev);
 599         tmp.st_ino = stat->ino;
 600         if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
 601                 return -EOVERFLOW;
 602         tmp.st_mode = stat->mode;
 603         tmp.st_nlink = stat->nlink;
 604         if (tmp.st_nlink != stat->nlink)
 605                 return -EOVERFLOW;
 606         SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
 607         SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
 608         tmp.st_rdev = old_encode_dev(stat->rdev);
 609         if ((u64) stat->size > MAX_NON_LFS)
 610                 return -EOVERFLOW;
 611         tmp.st_size = stat->size;
 612         tmp.st_atime = stat->atime.tv_sec;
 613         tmp.st_atime_nsec = stat->atime.tv_nsec;
 614         tmp.st_mtime = stat->mtime.tv_sec;
 615         tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 616         tmp.st_ctime = stat->ctime.tv_sec;
 617         tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 618         tmp.st_blocks = stat->blocks;
 619         tmp.st_blksize = stat->blksize;
 620         return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
 621 }
 622
 623 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
 624                        struct compat_stat __user *, statbuf)
 625 {
 626         struct kstat stat;
 627         int error;
 628
 629         error = vfs_stat(filename, &stat);
 630         if (error)
 631                 return error;
 632         return cp_compat_stat(&stat, statbuf);
 633 }
 634
 635 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
 636                        struct compat_stat __user *, statbuf)
 637 {
 638         struct kstat stat;
 639         int error;
 640
 641         error = vfs_lstat(filename, &stat);
 642         if (error)
 643                 return error;
 644         return cp_compat_stat(&stat, statbuf);
 645 }
 646
 647 #ifndef __ARCH_WANT_STAT64
 648 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
 649                        const char __user *, filename,
 650                        struct compat_stat __user *, statbuf, int, flag)
 651 {
 652         struct kstat stat;
 653         int error;
 654
 655         error = vfs_fstatat(dfd, filename, &stat, flag);
 656         if (error)
 657                 return error;
 658         return cp_compat_stat(&stat, statbuf);
 659 }
 660 #endif
 661
 662 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
 663                        struct compat_stat __user *, statbuf)
 664 {
 665         struct kstat stat;
 666         int error = vfs_fstat(fd, &stat);
 667
 668         if (!error)
 669                 error = cp_compat_stat(&stat, statbuf);
 670         return error;
 671 }
 672 #endif
 673
 674 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
 675 void __inode_add_bytes(struct inode *inode, loff_t bytes)
 676 {
 677         inode->i_blocks += bytes >> 9;
 678         bytes &= 511;
 679         inode->i_bytes += bytes;
 680         if (inode->i_bytes >= 512) {
 681                 inode->i_blocks++;
 682                 inode->i_bytes -= 512;
 683         }
 684 }
 685 EXPORT_SYMBOL(__inode_add_bytes);
 686
 687 void inode_add_bytes(struct inode *inode, loff_t bytes)
 688 {
 689         spin_lock(&inode->i_lock);
 690         __inode_add_bytes(inode, bytes);
 691         spin_unlock(&inode->i_lock);
 692 }
 693
 694 EXPORT_SYMBOL(inode_add_bytes);
 695
 696 void __inode_sub_bytes(struct inode *inode, loff_t bytes)
 697 {
 698         inode->i_blocks -= bytes >> 9;
 699         bytes &= 511;
 700         if (inode->i_bytes < bytes) {
 701                 inode->i_blocks--;
 702                 inode->i_bytes += 512;
 703         }
 704         inode->i_bytes -= bytes;
 705 }
 706
 707 EXPORT_SYMBOL(__inode_sub_bytes);
 708
 709 void inode_sub_bytes(struct inode *inode, loff_t bytes)
 710 {
 711         spin_lock(&inode->i_lock);
 712         __inode_sub_bytes(inode, bytes);
 713         spin_unlock(&inode->i_lock);
 714 }
 715
 716 EXPORT_SYMBOL(inode_sub_bytes);
 717
 718 loff_t inode_get_bytes(struct inode *inode)
 719 {
 720         loff_t ret;
 721
 722         spin_lock(&inode->i_lock);
 723         ret = __inode_get_bytes(inode);
 724         spin_unlock(&inode->i_lock);
 725         return ret;
 726 }
 727
 728 EXPORT_SYMBOL(inode_get_bytes);
 729
 730 void inode_set_bytes(struct inode *inode, loff_t bytes)
 731 {
 732         /* Caller is here responsible for sufficient locking
 733          * (ie. inode->i_lock) */
 734         inode->i_blocks = bytes >> 9;
 735         inode->i_bytes = bytes & 511;
 736 }
 737
 738 EXPORT_SYMBOL(inode_set_bytes);