1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/blkdev.h>
9 #include <linux/export.h>
11 #include <linux/errno.h>
12 #include <linux/file.h>
13 #include <linux/highuid.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/cred.h>
18 #include <linux/syscalls.h>
19 #include <linux/pagemap.h>
20 #include <linux/compat.h>
21 #include <linux/iversion.h>
23 #include <linux/uaccess.h>
24 #include <asm/unistd.h>
30 * generic_fillattr - Fill in the basic attributes from the inode struct
31 * @idmap: idmap of the mount the inode was found from
32 * @request_mask: statx request_mask
33 * @inode: Inode to use as the source
34 * @stat: Where to fill in the attributes
36 * Fill in the basic attributes in the kstat structure from data that's to be
37 * found on the VFS inode structure. This is the default if no getattr inode
38 * operation is supplied.
40 * If the inode has been found through an idmapped mount the idmap of
41 * the vfsmount must be passed through @idmap. This function will then
42 * take care to map the inode according to @idmap before filling in the
43 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
44 * performed on the raw inode simply passs @nop_mnt_idmap.
46 void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
47 struct inode *inode, struct kstat *stat)
49 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
50 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
52 stat->dev = inode->i_sb->s_dev;
53 stat->ino = inode->i_ino;
54 stat->mode = inode->i_mode;
55 stat->nlink = inode->i_nlink;
56 stat->uid = vfsuid_into_kuid(vfsuid);
57 stat->gid = vfsgid_into_kgid(vfsgid);
58 stat->rdev = inode->i_rdev;
59 stat->size = i_size_read(inode);
60 stat->atime = inode_get_atime(inode);
61 stat->mtime = inode_get_mtime(inode);
62 stat->ctime = inode_get_ctime(inode);
63 stat->blksize = i_blocksize(inode);
64 stat->blocks = inode->i_blocks;
66 if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
67 stat->result_mask |= STATX_CHANGE_COOKIE;
68 stat->change_cookie = inode_query_iversion(inode);
72 EXPORT_SYMBOL(generic_fillattr);
75 * generic_fill_statx_attr - Fill in the statx attributes from the inode flags
76 * @inode: Inode to use as the source
77 * @stat: Where to fill in the attribute flags
79 * Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
80 * inode that are published on i_flags and enforced by the VFS.
82 void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
84 if (inode->i_flags & S_IMMUTABLE)
85 stat->attributes |= STATX_ATTR_IMMUTABLE;
86 if (inode->i_flags & S_APPEND)
87 stat->attributes |= STATX_ATTR_APPEND;
88 stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
90 EXPORT_SYMBOL(generic_fill_statx_attr);
93 * vfs_getattr_nosec - getattr without security checks
94 * @path: file to get attributes from
95 * @stat: structure to return attributes in
96 * @request_mask: STATX_xxx flags indicating what the caller wants
97 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
99 * Get attributes without calling security_inode_getattr.
101 * Currently the only caller other than vfs_getattr is internal to the
102 * filehandle lookup code, which uses only the inode number and returns no
103 * attributes to any user. Any other code probably wants vfs_getattr.
105 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
106 u32 request_mask, unsigned int query_flags)
108 struct mnt_idmap *idmap;
109 struct inode *inode = d_backing_inode(path->dentry);
111 memset(stat, 0, sizeof(*stat));
112 stat->result_mask |= STATX_BASIC_STATS;
113 query_flags &= AT_STATX_SYNC_TYPE;
115 /* allow the fs to override these if it really wants to */
116 /* SB_NOATIME means filesystem supplies dummy atime value */
117 if (inode->i_sb->s_flags & SB_NOATIME)
118 stat->result_mask &= ~STATX_ATIME;
121 * Note: If you add another clause to set an attribute flag, please
122 * update attributes_mask below.
124 if (IS_AUTOMOUNT(inode))
125 stat->attributes |= STATX_ATTR_AUTOMOUNT;
128 stat->attributes |= STATX_ATTR_DAX;
130 stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
133 idmap = mnt_idmap(path->mnt);
134 if (inode->i_op->getattr)
135 return inode->i_op->getattr(idmap, path, stat,
137 query_flags | AT_GETATTR_NOSEC);
139 generic_fillattr(idmap, request_mask, inode, stat);
142 EXPORT_SYMBOL(vfs_getattr_nosec);
145 * vfs_getattr - Get the enhanced basic attributes of a file
146 * @path: The file of interest
147 * @stat: Where to return the statistics
148 * @request_mask: STATX_xxx flags indicating what the caller wants
149 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
151 * Ask the filesystem for a file's attributes. The caller must indicate in
152 * request_mask and query_flags to indicate what they want.
154 * If the file is remote, the filesystem can be forced to update the attributes
155 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
156 * suppress the update by passing AT_STATX_DONT_SYNC.
158 * Bits must have been set in request_mask to indicate which attributes the
159 * caller wants retrieving. Any such attribute not requested may be returned
160 * anyway, but the value may be approximate, and, if remote, may not have been
161 * synchronised with the server.
163 * 0 will be returned on success, and a -ve error code if unsuccessful.
165 int vfs_getattr(const struct path *path, struct kstat *stat,
166 u32 request_mask, unsigned int query_flags)
170 if (WARN_ON_ONCE(query_flags & AT_GETATTR_NOSEC))
173 retval = security_inode_getattr(path);
176 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
178 EXPORT_SYMBOL(vfs_getattr);
181 * vfs_fstat - Get the basic attributes by file descriptor
182 * @fd: The file descriptor referring to the file of interest
183 * @stat: The result structure to fill in.
185 * This function is a wrapper around vfs_getattr(). The main difference is
186 * that it uses a file descriptor to determine the file location.
188 * 0 will be returned on success, and a -ve error code if unsuccessful.
190 int vfs_fstat(int fd, struct kstat *stat)
198 error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
203 int getname_statx_lookup_flags(int flags)
205 int lookup_flags = 0;
207 if (!(flags & AT_SYMLINK_NOFOLLOW))
208 lookup_flags |= LOOKUP_FOLLOW;
209 if (!(flags & AT_NO_AUTOMOUNT))
210 lookup_flags |= LOOKUP_AUTOMOUNT;
211 if (flags & AT_EMPTY_PATH)
212 lookup_flags |= LOOKUP_EMPTY;
218 * vfs_statx - Get basic and extra attributes by filename
219 * @dfd: A file descriptor representing the base dir for a relative filename
220 * @filename: The name of the file of interest
221 * @flags: Flags to control the query
222 * @stat: The result structure to fill in.
223 * @request_mask: STATX_xxx flags indicating what the caller wants
225 * This function is a wrapper around vfs_getattr(). The main difference is
226 * that it uses a filename and base directory to determine the file location.
227 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
228 * at the given name from being referenced.
230 * 0 will be returned on success, and a -ve error code if unsuccessful.
232 static int vfs_statx(int dfd, struct filename *filename, int flags,
233 struct kstat *stat, u32 request_mask)
236 unsigned int lookup_flags = getname_statx_lookup_flags(flags);
239 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
244 error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
248 error = vfs_getattr(&path, stat, request_mask, flags);
250 stat->mnt_id = real_mount(path.mnt)->mnt_id;
251 stat->result_mask |= STATX_MNT_ID;
253 if (path.mnt->mnt_root == path.dentry)
254 stat->attributes |= STATX_ATTR_MOUNT_ROOT;
255 stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
257 /* Handle STATX_DIOALIGN for block devices. */
258 if (request_mask & STATX_DIOALIGN) {
259 struct inode *inode = d_backing_inode(path.dentry);
261 if (S_ISBLK(inode->i_mode))
262 bdev_statx_dioalign(inode, stat);
266 if (retry_estale(error, lookup_flags)) {
267 lookup_flags |= LOOKUP_REVAL;
274 int vfs_fstatat(int dfd, const char __user *filename,
275 struct kstat *stat, int flags)
278 int statx_flags = flags | AT_NO_AUTOMOUNT;
279 struct filename *name;
282 * Work around glibc turning fstat() into fstatat(AT_EMPTY_PATH)
284 * If AT_EMPTY_PATH is set, we expect the common case to be that
285 * empty path, and avoid doing all the extra pathname work.
287 if (dfd >= 0 && flags == AT_EMPTY_PATH) {
290 ret = get_user(c, filename);
295 return vfs_fstat(dfd, stat);
298 name = getname_flags(filename, getname_statx_lookup_flags(statx_flags), NULL);
299 ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
305 #ifdef __ARCH_WANT_OLD_STAT
308 * For backward compatibility? Maybe this should be moved
309 * into arch/i386 instead?
311 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
313 static int warncount = 5;
314 struct __old_kernel_stat tmp;
318 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
320 } else if (warncount < 0) {
321 /* it's laughable, but... */
325 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
326 tmp.st_dev = old_encode_dev(stat->dev);
327 tmp.st_ino = stat->ino;
328 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
330 tmp.st_mode = stat->mode;
331 tmp.st_nlink = stat->nlink;
332 if (tmp.st_nlink != stat->nlink)
334 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
335 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
336 tmp.st_rdev = old_encode_dev(stat->rdev);
337 #if BITS_PER_LONG == 32
338 if (stat->size > MAX_NON_LFS)
341 tmp.st_size = stat->size;
342 tmp.st_atime = stat->atime.tv_sec;
343 tmp.st_mtime = stat->mtime.tv_sec;
344 tmp.st_ctime = stat->ctime.tv_sec;
345 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
348 SYSCALL_DEFINE2(stat, const char __user *, filename,
349 struct __old_kernel_stat __user *, statbuf)
354 error = vfs_stat(filename, &stat);
358 return cp_old_stat(&stat, statbuf);
361 SYSCALL_DEFINE2(lstat, const char __user *, filename,
362 struct __old_kernel_stat __user *, statbuf)
367 error = vfs_lstat(filename, &stat);
371 return cp_old_stat(&stat, statbuf);
374 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
377 int error = vfs_fstat(fd, &stat);
380 error = cp_old_stat(&stat, statbuf);
385 #endif /* __ARCH_WANT_OLD_STAT */
387 #ifdef __ARCH_WANT_NEW_STAT
389 #ifndef INIT_STRUCT_STAT_PADDING
390 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
393 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
397 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
399 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
401 #if BITS_PER_LONG == 32
402 if (stat->size > MAX_NON_LFS)
406 INIT_STRUCT_STAT_PADDING(tmp);
407 tmp.st_dev = new_encode_dev(stat->dev);
408 tmp.st_ino = stat->ino;
409 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
411 tmp.st_mode = stat->mode;
412 tmp.st_nlink = stat->nlink;
413 if (tmp.st_nlink != stat->nlink)
415 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
416 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
417 tmp.st_rdev = new_encode_dev(stat->rdev);
418 tmp.st_size = stat->size;
419 tmp.st_atime = stat->atime.tv_sec;
420 tmp.st_mtime = stat->mtime.tv_sec;
421 tmp.st_ctime = stat->ctime.tv_sec;
422 #ifdef STAT_HAVE_NSEC
423 tmp.st_atime_nsec = stat->atime.tv_nsec;
424 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
425 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
427 tmp.st_blocks = stat->blocks;
428 tmp.st_blksize = stat->blksize;
429 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
432 SYSCALL_DEFINE2(newstat, const char __user *, filename,
433 struct stat __user *, statbuf)
436 int error = vfs_stat(filename, &stat);
440 return cp_new_stat(&stat, statbuf);
443 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
444 struct stat __user *, statbuf)
449 error = vfs_lstat(filename, &stat);
453 return cp_new_stat(&stat, statbuf);
456 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
457 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
458 struct stat __user *, statbuf, int, flag)
463 error = vfs_fstatat(dfd, filename, &stat, flag);
466 return cp_new_stat(&stat, statbuf);
470 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
473 int error = vfs_fstat(fd, &stat);
476 error = cp_new_stat(&stat, statbuf);
482 static int do_readlinkat(int dfd, const char __user *pathname,
483 char __user *buf, int bufsiz)
488 unsigned int lookup_flags = LOOKUP_EMPTY;
494 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
496 struct inode *inode = d_backing_inode(path.dentry);
498 error = empty ? -ENOENT : -EINVAL;
500 * AFS mountpoints allow readlink(2) but are not symlinks
502 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
503 error = security_inode_readlink(path.dentry);
506 error = vfs_readlink(path.dentry, buf, bufsiz);
510 if (retry_estale(error, lookup_flags)) {
511 lookup_flags |= LOOKUP_REVAL;
518 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
519 char __user *, buf, int, bufsiz)
521 return do_readlinkat(dfd, pathname, buf, bufsiz);
524 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
527 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
531 /* ---------- LFS-64 ----------- */
532 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
534 #ifndef INIT_STRUCT_STAT64_PADDING
535 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
538 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
542 INIT_STRUCT_STAT64_PADDING(tmp);
544 /* mips has weird padding, so we don't get 64 bits there */
545 tmp.st_dev = new_encode_dev(stat->dev);
546 tmp.st_rdev = new_encode_dev(stat->rdev);
548 tmp.st_dev = huge_encode_dev(stat->dev);
549 tmp.st_rdev = huge_encode_dev(stat->rdev);
551 tmp.st_ino = stat->ino;
552 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
554 #ifdef STAT64_HAS_BROKEN_ST_INO
555 tmp.__st_ino = stat->ino;
557 tmp.st_mode = stat->mode;
558 tmp.st_nlink = stat->nlink;
559 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
560 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
561 tmp.st_atime = stat->atime.tv_sec;
562 tmp.st_atime_nsec = stat->atime.tv_nsec;
563 tmp.st_mtime = stat->mtime.tv_sec;
564 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
565 tmp.st_ctime = stat->ctime.tv_sec;
566 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
567 tmp.st_size = stat->size;
568 tmp.st_blocks = stat->blocks;
569 tmp.st_blksize = stat->blksize;
570 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
573 SYSCALL_DEFINE2(stat64, const char __user *, filename,
574 struct stat64 __user *, statbuf)
577 int error = vfs_stat(filename, &stat);
580 error = cp_new_stat64(&stat, statbuf);
585 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
586 struct stat64 __user *, statbuf)
589 int error = vfs_lstat(filename, &stat);
592 error = cp_new_stat64(&stat, statbuf);
597 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
600 int error = vfs_fstat(fd, &stat);
603 error = cp_new_stat64(&stat, statbuf);
608 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
609 struct stat64 __user *, statbuf, int, flag)
614 error = vfs_fstatat(dfd, filename, &stat, flag);
617 return cp_new_stat64(&stat, statbuf);
619 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
621 static noinline_for_stack int
622 cp_statx(const struct kstat *stat, struct statx __user *buffer)
626 memset(&tmp, 0, sizeof(tmp));
628 /* STATX_CHANGE_COOKIE is kernel-only for now */
629 tmp.stx_mask = stat->result_mask & ~STATX_CHANGE_COOKIE;
630 tmp.stx_blksize = stat->blksize;
631 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
632 tmp.stx_attributes = stat->attributes & ~STATX_ATTR_CHANGE_MONOTONIC;
633 tmp.stx_nlink = stat->nlink;
634 tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
635 tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
636 tmp.stx_mode = stat->mode;
637 tmp.stx_ino = stat->ino;
638 tmp.stx_size = stat->size;
639 tmp.stx_blocks = stat->blocks;
640 tmp.stx_attributes_mask = stat->attributes_mask;
641 tmp.stx_atime.tv_sec = stat->atime.tv_sec;
642 tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
643 tmp.stx_btime.tv_sec = stat->btime.tv_sec;
644 tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
645 tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
646 tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
647 tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
648 tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
649 tmp.stx_rdev_major = MAJOR(stat->rdev);
650 tmp.stx_rdev_minor = MINOR(stat->rdev);
651 tmp.stx_dev_major = MAJOR(stat->dev);
652 tmp.stx_dev_minor = MINOR(stat->dev);
653 tmp.stx_mnt_id = stat->mnt_id;
654 tmp.stx_dio_mem_align = stat->dio_mem_align;
655 tmp.stx_dio_offset_align = stat->dio_offset_align;
657 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
660 int do_statx(int dfd, struct filename *filename, unsigned int flags,
661 unsigned int mask, struct statx __user *buffer)
666 if (mask & STATX__RESERVED)
668 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
671 /* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
674 mask &= ~STATX_CHANGE_COOKIE;
676 error = vfs_statx(dfd, filename, flags, &stat, mask);
680 return cp_statx(&stat, buffer);
684 * sys_statx - System call to get enhanced stats
685 * @dfd: Base directory to pathwalk from *or* fd to stat.
686 * @filename: File to stat or "" with AT_EMPTY_PATH
687 * @flags: AT_* flags to control pathwalk.
688 * @mask: Parts of statx struct actually required.
689 * @buffer: Result buffer.
691 * Note that fstat() can be emulated by setting dfd to the fd of interest,
692 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
694 SYSCALL_DEFINE5(statx,
695 int, dfd, const char __user *, filename, unsigned, flags,
697 struct statx __user *, buffer)
700 struct filename *name;
702 name = getname_flags(filename, getname_statx_lookup_flags(flags), NULL);
703 ret = do_statx(dfd, name, flags, mask, buffer);
709 #if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
710 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
712 struct compat_stat tmp;
714 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
716 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
719 memset(&tmp, 0, sizeof(tmp));
720 tmp.st_dev = new_encode_dev(stat->dev);
721 tmp.st_ino = stat->ino;
722 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
724 tmp.st_mode = stat->mode;
725 tmp.st_nlink = stat->nlink;
726 if (tmp.st_nlink != stat->nlink)
728 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
729 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
730 tmp.st_rdev = new_encode_dev(stat->rdev);
731 if ((u64) stat->size > MAX_NON_LFS)
733 tmp.st_size = stat->size;
734 tmp.st_atime = stat->atime.tv_sec;
735 tmp.st_atime_nsec = stat->atime.tv_nsec;
736 tmp.st_mtime = stat->mtime.tv_sec;
737 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
738 tmp.st_ctime = stat->ctime.tv_sec;
739 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
740 tmp.st_blocks = stat->blocks;
741 tmp.st_blksize = stat->blksize;
742 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
745 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
746 struct compat_stat __user *, statbuf)
751 error = vfs_stat(filename, &stat);
754 return cp_compat_stat(&stat, statbuf);
757 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
758 struct compat_stat __user *, statbuf)
763 error = vfs_lstat(filename, &stat);
766 return cp_compat_stat(&stat, statbuf);
769 #ifndef __ARCH_WANT_STAT64
770 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
771 const char __user *, filename,
772 struct compat_stat __user *, statbuf, int, flag)
777 error = vfs_fstatat(dfd, filename, &stat, flag);
780 return cp_compat_stat(&stat, statbuf);
784 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
785 struct compat_stat __user *, statbuf)
788 int error = vfs_fstat(fd, &stat);
791 error = cp_compat_stat(&stat, statbuf);
796 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
797 void __inode_add_bytes(struct inode *inode, loff_t bytes)
799 inode->i_blocks += bytes >> 9;
801 inode->i_bytes += bytes;
802 if (inode->i_bytes >= 512) {
804 inode->i_bytes -= 512;
807 EXPORT_SYMBOL(__inode_add_bytes);
809 void inode_add_bytes(struct inode *inode, loff_t bytes)
811 spin_lock(&inode->i_lock);
812 __inode_add_bytes(inode, bytes);
813 spin_unlock(&inode->i_lock);
816 EXPORT_SYMBOL(inode_add_bytes);
818 void __inode_sub_bytes(struct inode *inode, loff_t bytes)
820 inode->i_blocks -= bytes >> 9;
822 if (inode->i_bytes < bytes) {
824 inode->i_bytes += 512;
826 inode->i_bytes -= bytes;
829 EXPORT_SYMBOL(__inode_sub_bytes);
831 void inode_sub_bytes(struct inode *inode, loff_t bytes)
833 spin_lock(&inode->i_lock);
834 __inode_sub_bytes(inode, bytes);
835 spin_unlock(&inode->i_lock);
838 EXPORT_SYMBOL(inode_sub_bytes);
840 loff_t inode_get_bytes(struct inode *inode)
844 spin_lock(&inode->i_lock);
845 ret = __inode_get_bytes(inode);
846 spin_unlock(&inode->i_lock);
850 EXPORT_SYMBOL(inode_get_bytes);
852 void inode_set_bytes(struct inode *inode, loff_t bytes)
854 /* Caller is here responsible for sufficient locking
855 * (ie. inode->i_lock) */
856 inode->i_blocks = bytes >> 9;
857 inode->i_bytes = bytes & 511;
860 EXPORT_SYMBOL(inode_set_bytes);