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>
26 #include <trace/events/timestamp.h>
32 * fill_mg_cmtime - Fill in the mtime and ctime and flag ctime as QUERIED
33 * @stat: where to store the resulting values
34 * @request_mask: STATX_* values requested
35 * @inode: inode from which to grab the c/mtime
37 * Given @inode, grab the ctime and mtime out if it and store the result
38 * in @stat. When fetching the value, flag it as QUERIED (if not already)
39 * so the next write will record a distinct timestamp.
41 * NB: The QUERIED flag is tracked in the ctime, but we set it there even
42 * if only the mtime was requested, as that ensures that the next mtime
43 * change will be distinct.
45 void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode)
47 atomic_t *pcn = (atomic_t *)&inode->i_ctime_nsec;
49 /* If neither time was requested, then don't report them */
50 if (!(request_mask & (STATX_CTIME|STATX_MTIME))) {
51 stat->result_mask &= ~(STATX_CTIME|STATX_MTIME);
55 stat->mtime = inode_get_mtime(inode);
56 stat->ctime.tv_sec = inode->i_ctime_sec;
57 stat->ctime.tv_nsec = (u32)atomic_read(pcn);
58 if (!(stat->ctime.tv_nsec & I_CTIME_QUERIED))
59 stat->ctime.tv_nsec = ((u32)atomic_fetch_or(I_CTIME_QUERIED, pcn));
60 stat->ctime.tv_nsec &= ~I_CTIME_QUERIED;
61 trace_fill_mg_cmtime(inode, &stat->ctime, &stat->mtime);
63 EXPORT_SYMBOL(fill_mg_cmtime);
66 * generic_fillattr - Fill in the basic attributes from the inode struct
67 * @idmap: idmap of the mount the inode was found from
68 * @request_mask: statx request_mask
69 * @inode: Inode to use as the source
70 * @stat: Where to fill in the attributes
72 * Fill in the basic attributes in the kstat structure from data that's to be
73 * found on the VFS inode structure. This is the default if no getattr inode
74 * operation is supplied.
76 * If the inode has been found through an idmapped mount the idmap of
77 * the vfsmount must be passed through @idmap. This function will then
78 * take care to map the inode according to @idmap before filling in the
79 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
80 * performed on the raw inode simply pass @nop_mnt_idmap.
82 void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
83 struct inode *inode, struct kstat *stat)
85 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
86 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
88 stat->dev = inode->i_sb->s_dev;
89 stat->ino = inode->i_ino;
90 stat->mode = inode->i_mode;
91 stat->nlink = inode->i_nlink;
92 stat->uid = vfsuid_into_kuid(vfsuid);
93 stat->gid = vfsgid_into_kgid(vfsgid);
94 stat->rdev = inode->i_rdev;
95 stat->size = i_size_read(inode);
96 stat->atime = inode_get_atime(inode);
98 if (is_mgtime(inode)) {
99 fill_mg_cmtime(stat, request_mask, inode);
101 stat->ctime = inode_get_ctime(inode);
102 stat->mtime = inode_get_mtime(inode);
105 stat->blksize = i_blocksize(inode);
106 stat->blocks = inode->i_blocks;
108 if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
109 stat->result_mask |= STATX_CHANGE_COOKIE;
110 stat->change_cookie = inode_query_iversion(inode);
114 EXPORT_SYMBOL(generic_fillattr);
117 * generic_fill_statx_attr - Fill in the statx attributes from the inode flags
118 * @inode: Inode to use as the source
119 * @stat: Where to fill in the attribute flags
121 * Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
122 * inode that are published on i_flags and enforced by the VFS.
124 void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
126 if (inode->i_flags & S_IMMUTABLE)
127 stat->attributes |= STATX_ATTR_IMMUTABLE;
128 if (inode->i_flags & S_APPEND)
129 stat->attributes |= STATX_ATTR_APPEND;
130 stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
132 EXPORT_SYMBOL(generic_fill_statx_attr);
135 * generic_fill_statx_atomic_writes - Fill in atomic writes statx attributes
136 * @stat: Where to fill in the attribute flags
137 * @unit_min: Minimum supported atomic write length in bytes
138 * @unit_max: Maximum supported atomic write length in bytes
140 * Fill in the STATX{_ATTR}_WRITE_ATOMIC flags in the kstat structure from
141 * atomic write unit_min and unit_max values.
143 void generic_fill_statx_atomic_writes(struct kstat *stat,
144 unsigned int unit_min,
145 unsigned int unit_max)
147 /* Confirm that the request type is known */
148 stat->result_mask |= STATX_WRITE_ATOMIC;
150 /* Confirm that the file attribute type is known */
151 stat->attributes_mask |= STATX_ATTR_WRITE_ATOMIC;
154 stat->atomic_write_unit_min = unit_min;
155 stat->atomic_write_unit_max = unit_max;
156 /* Initially only allow 1x segment */
157 stat->atomic_write_segments_max = 1;
159 /* Confirm atomic writes are actually supported */
160 stat->attributes |= STATX_ATTR_WRITE_ATOMIC;
163 EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_writes);
166 * vfs_getattr_nosec - getattr without security checks
167 * @path: file to get attributes from
168 * @stat: structure to return attributes in
169 * @request_mask: STATX_xxx flags indicating what the caller wants
170 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
172 * Get attributes without calling security_inode_getattr.
174 * Currently the only caller other than vfs_getattr is internal to the
175 * filehandle lookup code, which uses only the inode number and returns no
176 * attributes to any user. Any other code probably wants vfs_getattr.
178 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
179 u32 request_mask, unsigned int query_flags)
181 struct mnt_idmap *idmap;
182 struct inode *inode = d_backing_inode(path->dentry);
184 memset(stat, 0, sizeof(*stat));
185 stat->result_mask |= STATX_BASIC_STATS;
186 query_flags &= AT_STATX_SYNC_TYPE;
188 /* allow the fs to override these if it really wants to */
189 /* SB_NOATIME means filesystem supplies dummy atime value */
190 if (inode->i_sb->s_flags & SB_NOATIME)
191 stat->result_mask &= ~STATX_ATIME;
194 * Note: If you add another clause to set an attribute flag, please
195 * update attributes_mask below.
197 if (IS_AUTOMOUNT(inode))
198 stat->attributes |= STATX_ATTR_AUTOMOUNT;
201 stat->attributes |= STATX_ATTR_DAX;
203 stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
206 idmap = mnt_idmap(path->mnt);
207 if (inode->i_op->getattr)
208 return inode->i_op->getattr(idmap, path, stat,
210 query_flags | AT_GETATTR_NOSEC);
212 generic_fillattr(idmap, request_mask, inode, stat);
215 EXPORT_SYMBOL(vfs_getattr_nosec);
218 * vfs_getattr - Get the enhanced basic attributes of a file
219 * @path: The file of interest
220 * @stat: Where to return the statistics
221 * @request_mask: STATX_xxx flags indicating what the caller wants
222 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
224 * Ask the filesystem for a file's attributes. The caller must indicate in
225 * request_mask and query_flags to indicate what they want.
227 * If the file is remote, the filesystem can be forced to update the attributes
228 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
229 * suppress the update by passing AT_STATX_DONT_SYNC.
231 * Bits must have been set in request_mask to indicate which attributes the
232 * caller wants retrieving. Any such attribute not requested may be returned
233 * anyway, but the value may be approximate, and, if remote, may not have been
234 * synchronised with the server.
236 * 0 will be returned on success, and a -ve error code if unsuccessful.
238 int vfs_getattr(const struct path *path, struct kstat *stat,
239 u32 request_mask, unsigned int query_flags)
243 if (WARN_ON_ONCE(query_flags & AT_GETATTR_NOSEC))
246 retval = security_inode_getattr(path);
249 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
251 EXPORT_SYMBOL(vfs_getattr);
254 * vfs_fstat - Get the basic attributes by file descriptor
255 * @fd: The file descriptor referring to the file of interest
256 * @stat: The result structure to fill in.
258 * This function is a wrapper around vfs_getattr(). The main difference is
259 * that it uses a file descriptor to determine the file location.
261 * 0 will be returned on success, and a -ve error code if unsuccessful.
263 int vfs_fstat(int fd, struct kstat *stat)
271 error = vfs_getattr(&fd_file(f)->f_path, stat, STATX_BASIC_STATS, 0);
276 int getname_statx_lookup_flags(int flags)
278 int lookup_flags = 0;
280 if (!(flags & AT_SYMLINK_NOFOLLOW))
281 lookup_flags |= LOOKUP_FOLLOW;
282 if (!(flags & AT_NO_AUTOMOUNT))
283 lookup_flags |= LOOKUP_AUTOMOUNT;
284 if (flags & AT_EMPTY_PATH)
285 lookup_flags |= LOOKUP_EMPTY;
290 static int vfs_statx_path(struct path *path, int flags, struct kstat *stat,
293 int error = vfs_getattr(path, stat, request_mask, flags);
295 if (request_mask & STATX_MNT_ID_UNIQUE) {
296 stat->mnt_id = real_mount(path->mnt)->mnt_id_unique;
297 stat->result_mask |= STATX_MNT_ID_UNIQUE;
299 stat->mnt_id = real_mount(path->mnt)->mnt_id;
300 stat->result_mask |= STATX_MNT_ID;
303 if (path_mounted(path))
304 stat->attributes |= STATX_ATTR_MOUNT_ROOT;
305 stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
308 * If this is a block device inode, override the filesystem
309 * attributes with the block device specific parameters that need to be
310 * obtained from the bdev backing inode.
312 if (S_ISBLK(stat->mode))
313 bdev_statx(path, stat, request_mask);
318 static int vfs_statx_fd(int fd, int flags, struct kstat *stat,
321 CLASS(fd_raw, f)(fd);
324 return vfs_statx_path(&fd_file(f)->f_path, flags, stat, request_mask);
328 * vfs_statx - Get basic and extra attributes by filename
329 * @dfd: A file descriptor representing the base dir for a relative filename
330 * @filename: The name of the file of interest
331 * @flags: Flags to control the query
332 * @stat: The result structure to fill in.
333 * @request_mask: STATX_xxx flags indicating what the caller wants
335 * This function is a wrapper around vfs_getattr(). The main difference is
336 * that it uses a filename and base directory to determine the file location.
337 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
338 * at the given name from being referenced.
340 * 0 will be returned on success, and a -ve error code if unsuccessful.
342 static int vfs_statx(int dfd, struct filename *filename, int flags,
343 struct kstat *stat, u32 request_mask)
346 unsigned int lookup_flags = getname_statx_lookup_flags(flags);
349 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
354 error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
357 error = vfs_statx_path(&path, flags, stat, request_mask);
359 if (retry_estale(error, lookup_flags)) {
360 lookup_flags |= LOOKUP_REVAL;
366 int vfs_fstatat(int dfd, const char __user *filename,
367 struct kstat *stat, int flags)
370 int statx_flags = flags | AT_NO_AUTOMOUNT;
371 struct filename *name = getname_maybe_null(filename, flags);
373 if (!name && dfd >= 0)
374 return vfs_fstat(dfd, stat);
376 ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
382 #ifdef __ARCH_WANT_OLD_STAT
385 * For backward compatibility? Maybe this should be moved
386 * into arch/i386 instead?
388 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
390 static int warncount = 5;
391 struct __old_kernel_stat tmp;
395 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
397 } else if (warncount < 0) {
398 /* it's laughable, but... */
402 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
403 tmp.st_dev = old_encode_dev(stat->dev);
404 tmp.st_ino = stat->ino;
405 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
407 tmp.st_mode = stat->mode;
408 tmp.st_nlink = stat->nlink;
409 if (tmp.st_nlink != stat->nlink)
411 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
412 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
413 tmp.st_rdev = old_encode_dev(stat->rdev);
414 #if BITS_PER_LONG == 32
415 if (stat->size > MAX_NON_LFS)
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 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
425 SYSCALL_DEFINE2(stat, const char __user *, filename,
426 struct __old_kernel_stat __user *, statbuf)
431 error = vfs_stat(filename, &stat);
435 return cp_old_stat(&stat, statbuf);
438 SYSCALL_DEFINE2(lstat, const char __user *, filename,
439 struct __old_kernel_stat __user *, statbuf)
444 error = vfs_lstat(filename, &stat);
448 return cp_old_stat(&stat, statbuf);
451 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
454 int error = vfs_fstat(fd, &stat);
457 error = cp_old_stat(&stat, statbuf);
462 #endif /* __ARCH_WANT_OLD_STAT */
464 #ifdef __ARCH_WANT_NEW_STAT
466 #ifndef INIT_STRUCT_STAT_PADDING
467 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
470 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
474 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
476 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
478 #if BITS_PER_LONG == 32
479 if (stat->size > MAX_NON_LFS)
483 INIT_STRUCT_STAT_PADDING(tmp);
484 tmp.st_dev = new_encode_dev(stat->dev);
485 tmp.st_ino = stat->ino;
486 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
488 tmp.st_mode = stat->mode;
489 tmp.st_nlink = stat->nlink;
490 if (tmp.st_nlink != stat->nlink)
492 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
493 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
494 tmp.st_rdev = new_encode_dev(stat->rdev);
495 tmp.st_size = stat->size;
496 tmp.st_atime = stat->atime.tv_sec;
497 tmp.st_mtime = stat->mtime.tv_sec;
498 tmp.st_ctime = stat->ctime.tv_sec;
499 #ifdef STAT_HAVE_NSEC
500 tmp.st_atime_nsec = stat->atime.tv_nsec;
501 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
502 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
504 tmp.st_blocks = stat->blocks;
505 tmp.st_blksize = stat->blksize;
506 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
509 SYSCALL_DEFINE2(newstat, const char __user *, filename,
510 struct stat __user *, statbuf)
513 int error = vfs_stat(filename, &stat);
517 return cp_new_stat(&stat, statbuf);
520 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
521 struct stat __user *, statbuf)
526 error = vfs_lstat(filename, &stat);
530 return cp_new_stat(&stat, statbuf);
533 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
534 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
535 struct stat __user *, statbuf, int, flag)
540 error = vfs_fstatat(dfd, filename, &stat, flag);
543 return cp_new_stat(&stat, statbuf);
547 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
550 int error = vfs_fstat(fd, &stat);
553 error = cp_new_stat(&stat, statbuf);
559 static int do_readlinkat(int dfd, const char __user *pathname,
560 char __user *buf, int bufsiz)
563 struct filename *name;
565 unsigned int lookup_flags = LOOKUP_EMPTY;
571 name = getname_flags(pathname, lookup_flags);
572 error = filename_lookup(dfd, name, lookup_flags, &path, NULL);
573 if (unlikely(error)) {
579 * AFS mountpoints allow readlink(2) but are not symlinks
581 if (d_is_symlink(path.dentry) ||
582 d_backing_inode(path.dentry)->i_op->readlink) {
583 error = security_inode_readlink(path.dentry);
586 error = vfs_readlink(path.dentry, buf, bufsiz);
589 error = (name->name[0] == '\0') ? -ENOENT : -EINVAL;
593 if (retry_estale(error, lookup_flags)) {
594 lookup_flags |= LOOKUP_REVAL;
600 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
601 char __user *, buf, int, bufsiz)
603 return do_readlinkat(dfd, pathname, buf, bufsiz);
606 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
609 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
613 /* ---------- LFS-64 ----------- */
614 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
616 #ifndef INIT_STRUCT_STAT64_PADDING
617 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
620 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
624 INIT_STRUCT_STAT64_PADDING(tmp);
626 /* mips has weird padding, so we don't get 64 bits there */
627 tmp.st_dev = new_encode_dev(stat->dev);
628 tmp.st_rdev = new_encode_dev(stat->rdev);
630 tmp.st_dev = huge_encode_dev(stat->dev);
631 tmp.st_rdev = huge_encode_dev(stat->rdev);
633 tmp.st_ino = stat->ino;
634 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
636 #ifdef STAT64_HAS_BROKEN_ST_INO
637 tmp.__st_ino = stat->ino;
639 tmp.st_mode = stat->mode;
640 tmp.st_nlink = stat->nlink;
641 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
642 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
643 tmp.st_atime = stat->atime.tv_sec;
644 tmp.st_atime_nsec = stat->atime.tv_nsec;
645 tmp.st_mtime = stat->mtime.tv_sec;
646 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
647 tmp.st_ctime = stat->ctime.tv_sec;
648 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
649 tmp.st_size = stat->size;
650 tmp.st_blocks = stat->blocks;
651 tmp.st_blksize = stat->blksize;
652 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
655 SYSCALL_DEFINE2(stat64, const char __user *, filename,
656 struct stat64 __user *, statbuf)
659 int error = vfs_stat(filename, &stat);
662 error = cp_new_stat64(&stat, statbuf);
667 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
668 struct stat64 __user *, statbuf)
671 int error = vfs_lstat(filename, &stat);
674 error = cp_new_stat64(&stat, statbuf);
679 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
682 int error = vfs_fstat(fd, &stat);
685 error = cp_new_stat64(&stat, statbuf);
690 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
691 struct stat64 __user *, statbuf, int, flag)
696 error = vfs_fstatat(dfd, filename, &stat, flag);
699 return cp_new_stat64(&stat, statbuf);
701 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
703 static noinline_for_stack int
704 cp_statx(const struct kstat *stat, struct statx __user *buffer)
708 memset(&tmp, 0, sizeof(tmp));
710 /* STATX_CHANGE_COOKIE is kernel-only for now */
711 tmp.stx_mask = stat->result_mask & ~STATX_CHANGE_COOKIE;
712 tmp.stx_blksize = stat->blksize;
713 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
714 tmp.stx_attributes = stat->attributes & ~STATX_ATTR_CHANGE_MONOTONIC;
715 tmp.stx_nlink = stat->nlink;
716 tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
717 tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
718 tmp.stx_mode = stat->mode;
719 tmp.stx_ino = stat->ino;
720 tmp.stx_size = stat->size;
721 tmp.stx_blocks = stat->blocks;
722 tmp.stx_attributes_mask = stat->attributes_mask;
723 tmp.stx_atime.tv_sec = stat->atime.tv_sec;
724 tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
725 tmp.stx_btime.tv_sec = stat->btime.tv_sec;
726 tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
727 tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
728 tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
729 tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
730 tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
731 tmp.stx_rdev_major = MAJOR(stat->rdev);
732 tmp.stx_rdev_minor = MINOR(stat->rdev);
733 tmp.stx_dev_major = MAJOR(stat->dev);
734 tmp.stx_dev_minor = MINOR(stat->dev);
735 tmp.stx_mnt_id = stat->mnt_id;
736 tmp.stx_dio_mem_align = stat->dio_mem_align;
737 tmp.stx_dio_offset_align = stat->dio_offset_align;
738 tmp.stx_subvol = stat->subvol;
739 tmp.stx_atomic_write_unit_min = stat->atomic_write_unit_min;
740 tmp.stx_atomic_write_unit_max = stat->atomic_write_unit_max;
741 tmp.stx_atomic_write_segments_max = stat->atomic_write_segments_max;
743 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
746 int do_statx(int dfd, struct filename *filename, unsigned int flags,
747 unsigned int mask, struct statx __user *buffer)
752 if (mask & STATX__RESERVED)
754 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
758 * STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
761 mask &= ~STATX_CHANGE_COOKIE;
763 error = vfs_statx(dfd, filename, flags, &stat, mask);
767 return cp_statx(&stat, buffer);
770 int do_statx_fd(int fd, unsigned int flags, unsigned int mask,
771 struct statx __user *buffer)
776 if (mask & STATX__RESERVED)
778 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
782 * STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
785 mask &= ~STATX_CHANGE_COOKIE;
787 error = vfs_statx_fd(fd, flags, &stat, mask);
791 return cp_statx(&stat, buffer);
795 * sys_statx - System call to get enhanced stats
796 * @dfd: Base directory to pathwalk from *or* fd to stat.
797 * @filename: File to stat or either NULL or "" with AT_EMPTY_PATH
798 * @flags: AT_* flags to control pathwalk.
799 * @mask: Parts of statx struct actually required.
800 * @buffer: Result buffer.
802 * Note that fstat() can be emulated by setting dfd to the fd of interest,
803 * supplying "" (or preferably NULL) as the filename and setting AT_EMPTY_PATH
806 SYSCALL_DEFINE5(statx,
807 int, dfd, const char __user *, filename, unsigned, flags,
809 struct statx __user *, buffer)
812 struct filename *name = getname_maybe_null(filename, flags);
814 if (!name && dfd >= 0)
815 return do_statx_fd(dfd, flags & ~AT_NO_AUTOMOUNT, mask, buffer);
817 ret = do_statx(dfd, name, flags, mask, buffer);
823 #if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
824 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
826 struct compat_stat tmp;
828 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
830 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
833 memset(&tmp, 0, sizeof(tmp));
834 tmp.st_dev = new_encode_dev(stat->dev);
835 tmp.st_ino = stat->ino;
836 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
838 tmp.st_mode = stat->mode;
839 tmp.st_nlink = stat->nlink;
840 if (tmp.st_nlink != stat->nlink)
842 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
843 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
844 tmp.st_rdev = new_encode_dev(stat->rdev);
845 if ((u64) stat->size > MAX_NON_LFS)
847 tmp.st_size = stat->size;
848 tmp.st_atime = stat->atime.tv_sec;
849 tmp.st_atime_nsec = stat->atime.tv_nsec;
850 tmp.st_mtime = stat->mtime.tv_sec;
851 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
852 tmp.st_ctime = stat->ctime.tv_sec;
853 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
854 tmp.st_blocks = stat->blocks;
855 tmp.st_blksize = stat->blksize;
856 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
859 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
860 struct compat_stat __user *, statbuf)
865 error = vfs_stat(filename, &stat);
868 return cp_compat_stat(&stat, statbuf);
871 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
872 struct compat_stat __user *, statbuf)
877 error = vfs_lstat(filename, &stat);
880 return cp_compat_stat(&stat, statbuf);
883 #ifndef __ARCH_WANT_STAT64
884 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
885 const char __user *, filename,
886 struct compat_stat __user *, statbuf, int, flag)
891 error = vfs_fstatat(dfd, filename, &stat, flag);
894 return cp_compat_stat(&stat, statbuf);
898 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
899 struct compat_stat __user *, statbuf)
902 int error = vfs_fstat(fd, &stat);
905 error = cp_compat_stat(&stat, statbuf);
910 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
911 void __inode_add_bytes(struct inode *inode, loff_t bytes)
913 inode->i_blocks += bytes >> 9;
915 inode->i_bytes += bytes;
916 if (inode->i_bytes >= 512) {
918 inode->i_bytes -= 512;
921 EXPORT_SYMBOL(__inode_add_bytes);
923 void inode_add_bytes(struct inode *inode, loff_t bytes)
925 spin_lock(&inode->i_lock);
926 __inode_add_bytes(inode, bytes);
927 spin_unlock(&inode->i_lock);
930 EXPORT_SYMBOL(inode_add_bytes);
932 void __inode_sub_bytes(struct inode *inode, loff_t bytes)
934 inode->i_blocks -= bytes >> 9;
936 if (inode->i_bytes < bytes) {
938 inode->i_bytes += 512;
940 inode->i_bytes -= bytes;
943 EXPORT_SYMBOL(__inode_sub_bytes);
945 void inode_sub_bytes(struct inode *inode, loff_t bytes)
947 spin_lock(&inode->i_lock);
948 __inode_sub_bytes(inode, bytes);
949 spin_unlock(&inode->i_lock);
952 EXPORT_SYMBOL(inode_sub_bytes);
954 loff_t inode_get_bytes(struct inode *inode)
958 spin_lock(&inode->i_lock);
959 ret = __inode_get_bytes(inode);
960 spin_unlock(&inode->i_lock);
964 EXPORT_SYMBOL(inode_get_bytes);
966 void inode_set_bytes(struct inode *inode, loff_t bytes)
968 /* Caller is here responsible for sufficient locking
969 * (ie. inode->i_lock) */
970 inode->i_blocks = bytes >> 9;
971 inode->i_bytes = bytes & 511;
974 EXPORT_SYMBOL(inode_set_bytes);