4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/string.h>
9 #include <linux/file.h>
10 #include <linux/quotaops.h>
11 #include <linux/fsnotify.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/tty.h>
15 #include <linux/namei.h>
16 #include <linux/backing-dev.h>
17 #include <linux/capability.h>
18 #include <linux/security.h>
19 #include <linux/mount.h>
20 #include <linux/vfs.h>
21 #include <linux/fcntl.h>
22 #include <asm/uaccess.h>
24 #include <linux/personality.h>
25 #include <linux/pagemap.h>
26 #include <linux/syscalls.h>
27 #include <linux/rcupdate.h>
28 #include <linux/audit.h>
29 #include <linux/falloc.h>
31 int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
37 if (dentry->d_sb->s_op->statfs) {
38 memset(buf, 0, sizeof(*buf));
39 retval = security_sb_statfs(dentry);
42 retval = dentry->d_sb->s_op->statfs(dentry, buf);
43 if (retval == 0 && buf->f_frsize == 0)
44 buf->f_frsize = buf->f_bsize;
50 EXPORT_SYMBOL(vfs_statfs);
52 static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
57 retval = vfs_statfs(dentry, &st);
61 if (sizeof(*buf) == sizeof(st))
62 memcpy(buf, &st, sizeof(st));
64 if (sizeof buf->f_blocks == 4) {
65 if ((st.f_blocks | st.f_bfree | st.f_bavail) &
66 0xffffffff00000000ULL)
69 * f_files and f_ffree may be -1; it's okay to stuff
72 if (st.f_files != -1 &&
73 (st.f_files & 0xffffffff00000000ULL))
75 if (st.f_ffree != -1 &&
76 (st.f_ffree & 0xffffffff00000000ULL))
80 buf->f_type = st.f_type;
81 buf->f_bsize = st.f_bsize;
82 buf->f_blocks = st.f_blocks;
83 buf->f_bfree = st.f_bfree;
84 buf->f_bavail = st.f_bavail;
85 buf->f_files = st.f_files;
86 buf->f_ffree = st.f_ffree;
87 buf->f_fsid = st.f_fsid;
88 buf->f_namelen = st.f_namelen;
89 buf->f_frsize = st.f_frsize;
90 memset(buf->f_spare, 0, sizeof(buf->f_spare));
95 static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
100 retval = vfs_statfs(dentry, &st);
104 if (sizeof(*buf) == sizeof(st))
105 memcpy(buf, &st, sizeof(st));
107 buf->f_type = st.f_type;
108 buf->f_bsize = st.f_bsize;
109 buf->f_blocks = st.f_blocks;
110 buf->f_bfree = st.f_bfree;
111 buf->f_bavail = st.f_bavail;
112 buf->f_files = st.f_files;
113 buf->f_ffree = st.f_ffree;
114 buf->f_fsid = st.f_fsid;
115 buf->f_namelen = st.f_namelen;
116 buf->f_frsize = st.f_frsize;
117 memset(buf->f_spare, 0, sizeof(buf->f_spare));
122 asmlinkage long sys_statfs(const char __user * path, struct statfs __user * buf)
127 error = user_path_walk(path, &nd);
130 error = vfs_statfs_native(nd.dentry, &tmp);
131 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
139 asmlinkage long sys_statfs64(const char __user *path, size_t sz, struct statfs64 __user *buf)
144 if (sz != sizeof(*buf))
146 error = user_path_walk(path, &nd);
149 error = vfs_statfs64(nd.dentry, &tmp);
150 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
158 asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user * buf)
168 error = vfs_statfs_native(file->f_path.dentry, &tmp);
169 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
176 asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz, struct statfs64 __user *buf)
182 if (sz != sizeof(*buf))
189 error = vfs_statfs64(file->f_path.dentry, &tmp);
190 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
197 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
201 struct iattr newattrs;
203 /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
207 newattrs.ia_size = length;
208 newattrs.ia_valid = ATTR_SIZE | time_attrs;
210 newattrs.ia_file = filp;
211 newattrs.ia_valid |= ATTR_FILE;
214 /* Remove suid/sgid on truncate too */
215 newattrs.ia_valid |= should_remove_suid(dentry);
217 mutex_lock(&dentry->d_inode->i_mutex);
218 err = notify_change(dentry, &newattrs);
219 mutex_unlock(&dentry->d_inode->i_mutex);
223 static long do_sys_truncate(const char __user * path, loff_t length)
226 struct inode * inode;
230 if (length < 0) /* sorry, but loff_t says... */
233 error = user_path_walk(path, &nd);
236 inode = nd.dentry->d_inode;
238 /* For directories it's -EISDIR, for other non-regulars - -EINVAL */
240 if (S_ISDIR(inode->i_mode))
244 if (!S_ISREG(inode->i_mode))
247 error = vfs_permission(&nd, MAY_WRITE);
252 if (IS_RDONLY(inode))
256 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
260 * Make sure that there are no leases.
262 error = break_lease(inode, FMODE_WRITE);
266 error = get_write_access(inode);
270 error = locks_verify_truncate(inode, NULL, length);
273 error = do_truncate(nd.dentry, length, 0, NULL);
275 put_write_access(inode);
283 asmlinkage long sys_truncate(const char __user * path, unsigned long length)
285 /* on 32-bit boxen it will cut the range 2^31--2^32-1 off */
286 return do_sys_truncate(path, (long)length);
289 static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
291 struct inode * inode;
292 struct dentry *dentry;
304 /* explicitly opened as large or we are on 64-bit box */
305 if (file->f_flags & O_LARGEFILE)
308 dentry = file->f_path.dentry;
309 inode = dentry->d_inode;
311 if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
315 /* Cannot ftruncate over 2^31 bytes without large file support */
316 if (small && length > MAX_NON_LFS)
320 if (IS_APPEND(inode))
323 error = locks_verify_truncate(inode, file, length);
325 error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
332 asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length)
334 long ret = do_sys_ftruncate(fd, length, 1);
335 /* avoid REGPARM breakage on x86: */
336 prevent_tail_call(ret);
340 /* LFS versions of truncate are only needed on 32 bit machines */
341 #if BITS_PER_LONG == 32
342 asmlinkage long sys_truncate64(const char __user * path, loff_t length)
344 return do_sys_truncate(path, length);
347 asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
349 long ret = do_sys_ftruncate(fd, length, 0);
350 /* avoid REGPARM breakage on x86: */
351 prevent_tail_call(ret);
356 asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
362 if (offset < 0 || len <= 0)
365 /* Return error if mode is not supported */
367 if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
374 if (!(file->f_mode & FMODE_WRITE))
377 * Revalidate the write permissions, in case security policy has
378 * changed since the files were opened.
380 ret = security_file_permission(file, MAY_WRITE);
384 inode = file->f_path.dentry->d_inode;
387 if (S_ISFIFO(inode->i_mode))
392 * Let individual file system decide if it supports preallocation
393 * for directories or not.
395 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
399 /* Check for wrap through zero too */
400 if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
403 if (inode->i_op && inode->i_op->fallocate)
404 ret = inode->i_op->fallocate(inode, mode, offset, len);
415 * access() needs to use the real uid/gid, not the effective uid/gid.
416 * We do this by temporarily clearing all FS-related capabilities and
417 * switching the fsuid/fsgid around to the real ones.
419 asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
422 int old_fsuid, old_fsgid;
423 kernel_cap_t old_cap;
426 if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
429 old_fsuid = current->fsuid;
430 old_fsgid = current->fsgid;
431 old_cap = current->cap_effective;
433 current->fsuid = current->uid;
434 current->fsgid = current->gid;
437 * Clear the capabilities if we switch to a non-root user
439 * FIXME: There is a race here against sys_capset. The
440 * capabilities can change yet we will restore the old
441 * value below. We should hold task_capabilities_lock,
442 * but we cannot because user_path_walk can sleep.
445 cap_clear(current->cap_effective);
447 current->cap_effective = current->cap_permitted;
449 res = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW|LOOKUP_ACCESS, &nd);
453 res = vfs_permission(&nd, mode);
454 /* SuS v2 requires we report a read only fs too */
455 if(res || !(mode & S_IWOTH) ||
456 special_file(nd.dentry->d_inode->i_mode))
457 goto out_path_release;
459 if(IS_RDONLY(nd.dentry->d_inode))
465 current->fsuid = old_fsuid;
466 current->fsgid = old_fsgid;
467 current->cap_effective = old_cap;
472 asmlinkage long sys_access(const char __user *filename, int mode)
474 return sys_faccessat(AT_FDCWD, filename, mode);
477 asmlinkage long sys_chdir(const char __user * filename)
482 error = __user_walk(filename,
483 LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
487 error = vfs_permission(&nd, MAY_EXEC);
491 set_fs_pwd(current->fs, nd.mnt, nd.dentry);
499 asmlinkage long sys_fchdir(unsigned int fd)
502 struct dentry *dentry;
504 struct vfsmount *mnt;
512 dentry = file->f_path.dentry;
513 mnt = file->f_path.mnt;
514 inode = dentry->d_inode;
517 if (!S_ISDIR(inode->i_mode))
520 error = file_permission(file, MAY_EXEC);
522 set_fs_pwd(current->fs, mnt, dentry);
529 asmlinkage long sys_chroot(const char __user * filename)
534 error = __user_walk(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY | LOOKUP_NOALT, &nd);
538 error = vfs_permission(&nd, MAY_EXEC);
543 if (!capable(CAP_SYS_CHROOT))
546 set_fs_root(current->fs, nd.mnt, nd.dentry);
555 asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
557 struct inode * inode;
558 struct dentry * dentry;
561 struct iattr newattrs;
567 dentry = file->f_path.dentry;
568 inode = dentry->d_inode;
570 audit_inode(NULL, inode);
573 if (IS_RDONLY(inode))
576 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
578 mutex_lock(&inode->i_mutex);
579 if (mode == (mode_t) -1)
580 mode = inode->i_mode;
581 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
582 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
583 err = notify_change(dentry, &newattrs);
584 mutex_unlock(&inode->i_mutex);
592 asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
596 struct inode * inode;
598 struct iattr newattrs;
600 error = __user_walk_fd(dfd, filename, LOOKUP_FOLLOW, &nd);
603 inode = nd.dentry->d_inode;
606 if (IS_RDONLY(inode))
610 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
613 mutex_lock(&inode->i_mutex);
614 if (mode == (mode_t) -1)
615 mode = inode->i_mode;
616 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
617 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
618 error = notify_change(nd.dentry, &newattrs);
619 mutex_unlock(&inode->i_mutex);
627 asmlinkage long sys_chmod(const char __user *filename, mode_t mode)
629 return sys_fchmodat(AT_FDCWD, filename, mode);
632 static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
634 struct inode * inode;
636 struct iattr newattrs;
639 if (!(inode = dentry->d_inode)) {
640 printk(KERN_ERR "chown_common: NULL inode\n");
644 if (IS_RDONLY(inode))
647 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
649 newattrs.ia_valid = ATTR_CTIME;
650 if (user != (uid_t) -1) {
651 newattrs.ia_valid |= ATTR_UID;
652 newattrs.ia_uid = user;
654 if (group != (gid_t) -1) {
655 newattrs.ia_valid |= ATTR_GID;
656 newattrs.ia_gid = group;
658 if (!S_ISDIR(inode->i_mode))
659 newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
660 mutex_lock(&inode->i_mutex);
661 error = notify_change(dentry, &newattrs);
662 mutex_unlock(&inode->i_mutex);
667 asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
672 error = user_path_walk(filename, &nd);
675 error = chown_common(nd.dentry, user, group);
681 asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
682 gid_t group, int flag)
688 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
691 follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
692 error = __user_walk_fd(dfd, filename, follow, &nd);
695 error = chown_common(nd.dentry, user, group);
701 asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
706 error = user_path_walk_link(filename, &nd);
709 error = chown_common(nd.dentry, user, group);
716 asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
720 struct dentry * dentry;
726 dentry = file->f_path.dentry;
727 audit_inode(NULL, dentry->d_inode);
728 error = chown_common(dentry, user, group);
734 static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
735 int flags, struct file *f,
736 int (*open)(struct inode *, struct file *))
742 f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
743 FMODE_PREAD | FMODE_PWRITE;
744 inode = dentry->d_inode;
745 if (f->f_mode & FMODE_WRITE) {
746 error = get_write_access(inode);
751 f->f_mapping = inode->i_mapping;
752 f->f_path.dentry = dentry;
755 f->f_op = fops_get(inode->i_fop);
756 file_move(f, &inode->i_sb->s_files);
758 if (!open && f->f_op)
759 open = f->f_op->open;
761 error = open(inode, f);
766 f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
768 file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
770 /* NB: we're sure to have correct a_ops only after f_op->open */
771 if (f->f_flags & O_DIRECT) {
772 if (!f->f_mapping->a_ops ||
773 ((!f->f_mapping->a_ops->direct_IO) &&
774 (!f->f_mapping->a_ops->get_xip_page))) {
776 f = ERR_PTR(-EINVAL);
784 if (f->f_mode & FMODE_WRITE)
785 put_write_access(inode);
787 f->f_path.dentry = NULL;
788 f->f_path.mnt = NULL;
793 return ERR_PTR(error);
797 * Note that while the flag value (low two bits) for sys_open means:
803 * 00 - no permissions needed
804 * 01 - read-permission
805 * 10 - write-permission
807 * for the internal routines (ie open_namei()/follow_link() etc). 00 is
810 static struct file *do_filp_open(int dfd, const char *filename, int flags,
813 int namei_flags, error;
817 if ((namei_flags+1) & O_ACCMODE)
820 error = open_namei(dfd, filename, namei_flags, mode, &nd);
822 return nameidata_to_filp(&nd, flags);
824 return ERR_PTR(error);
827 struct file *filp_open(const char *filename, int flags, int mode)
829 return do_filp_open(AT_FDCWD, filename, flags, mode);
831 EXPORT_SYMBOL(filp_open);
834 * lookup_instantiate_filp - instantiates the open intent filp
835 * @nd: pointer to nameidata
836 * @dentry: pointer to dentry
837 * @open: open callback
839 * Helper for filesystems that want to use lookup open intents and pass back
840 * a fully instantiated struct file to the caller.
841 * This function is meant to be called from within a filesystem's
843 * Beware of calling it for non-regular files! Those ->open methods might block
844 * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo,
845 * leading to a deadlock, as nobody can open that fifo anymore, because
846 * another process to open fifo will block on locked parent when doing lookup).
847 * Note that in case of error, nd->intent.open.file is destroyed, but the
848 * path information remains valid.
849 * If the open callback is set to NULL, then the standard f_op->open()
850 * filesystem callback is substituted.
852 struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
853 int (*open)(struct inode *, struct file *))
855 if (IS_ERR(nd->intent.open.file))
859 nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->mnt),
860 nd->intent.open.flags - 1,
861 nd->intent.open.file,
864 return nd->intent.open.file;
866 release_open_intent(nd);
867 nd->intent.open.file = (struct file *)dentry;
870 EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
873 * nameidata_to_filp - convert a nameidata to an open filp.
874 * @nd: pointer to nameidata
877 * Note that this function destroys the original nameidata
879 struct file *nameidata_to_filp(struct nameidata *nd, int flags)
883 /* Pick up the filp from the open intent */
884 filp = nd->intent.open.file;
885 /* Has the filesystem initialised the file for us? */
886 if (filp->f_path.dentry == NULL)
887 filp = __dentry_open(nd->dentry, nd->mnt, flags, filp, NULL);
894 * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
897 struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
903 f = get_empty_filp();
907 return ERR_PTR(error);
910 return __dentry_open(dentry, mnt, flags, f, NULL);
912 EXPORT_SYMBOL(dentry_open);
915 * Find an empty file descriptor entry, and mark it busy.
917 int get_unused_fd_flags(int flags)
919 struct files_struct * files = current->files;
924 spin_lock(&files->file_lock);
927 fdt = files_fdtable(files);
928 fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
932 * N.B. For clone tasks sharing a files structure, this test
933 * will limit the total number of files that can be opened.
935 if (fd >= current->signal->rlim[RLIMIT_NOFILE].rlim_cur)
938 /* Do we need to expand the fd array or fd set? */
939 error = expand_files(files, fd);
945 * If we needed to expand the fs array we
946 * might have blocked - try again.
952 FD_SET(fd, fdt->open_fds);
953 if (flags & O_CLOEXEC)
954 FD_SET(fd, fdt->close_on_exec);
956 FD_CLR(fd, fdt->close_on_exec);
957 files->next_fd = fd + 1;
960 if (fdt->fd[fd] != NULL) {
961 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!\n", fd);
968 spin_unlock(&files->file_lock);
972 int get_unused_fd(void)
974 return get_unused_fd_flags(0);
977 EXPORT_SYMBOL(get_unused_fd);
979 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
981 struct fdtable *fdt = files_fdtable(files);
982 __FD_CLR(fd, fdt->open_fds);
983 if (fd < files->next_fd)
987 void fastcall put_unused_fd(unsigned int fd)
989 struct files_struct *files = current->files;
990 spin_lock(&files->file_lock);
991 __put_unused_fd(files, fd);
992 spin_unlock(&files->file_lock);
995 EXPORT_SYMBOL(put_unused_fd);
998 * Install a file pointer in the fd array.
1000 * The VFS is full of places where we drop the files lock between
1001 * setting the open_fds bitmap and installing the file in the file
1002 * array. At any such point, we are vulnerable to a dup2() race
1003 * installing a file in the array before us. We need to detect this and
1004 * fput() the struct file we are about to overwrite in this case.
1006 * It should never happen - if we allow dup2() do it, _really_ bad things
1010 void fastcall fd_install(unsigned int fd, struct file * file)
1012 struct files_struct *files = current->files;
1013 struct fdtable *fdt;
1014 spin_lock(&files->file_lock);
1015 fdt = files_fdtable(files);
1016 BUG_ON(fdt->fd[fd] != NULL);
1017 rcu_assign_pointer(fdt->fd[fd], file);
1018 spin_unlock(&files->file_lock);
1021 EXPORT_SYMBOL(fd_install);
1023 long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
1025 char *tmp = getname(filename);
1026 int fd = PTR_ERR(tmp);
1029 fd = get_unused_fd_flags(flags);
1031 struct file *f = do_filp_open(dfd, tmp, flags, mode);
1036 fsnotify_open(f->f_path.dentry);
1045 asmlinkage long sys_open(const char __user *filename, int flags, int mode)
1049 if (force_o_largefile())
1050 flags |= O_LARGEFILE;
1052 ret = do_sys_open(AT_FDCWD, filename, flags, mode);
1053 /* avoid REGPARM breakage on x86: */
1054 prevent_tail_call(ret);
1057 EXPORT_SYMBOL_GPL(sys_open);
1059 asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
1064 if (force_o_largefile())
1065 flags |= O_LARGEFILE;
1067 ret = do_sys_open(dfd, filename, flags, mode);
1068 /* avoid REGPARM breakage on x86: */
1069 prevent_tail_call(ret);
1076 * For backward compatibility? Maybe this should be moved
1077 * into arch/i386 instead?
1079 asmlinkage long sys_creat(const char __user * pathname, int mode)
1081 return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode);
1087 * "id" is the POSIX thread ID. We use the
1088 * files pointer for this..
1090 int filp_close(struct file *filp, fl_owner_t id)
1094 if (!file_count(filp)) {
1095 printk(KERN_ERR "VFS: Close: file count is 0\n");
1099 if (filp->f_op && filp->f_op->flush)
1100 retval = filp->f_op->flush(filp, id);
1102 dnotify_flush(filp, id);
1103 locks_remove_posix(filp, id);
1108 EXPORT_SYMBOL(filp_close);
1111 * Careful here! We test whether the file pointer is NULL before
1112 * releasing the fd. This ensures that one clone task can't release
1113 * an fd while another clone is opening it.
1115 asmlinkage long sys_close(unsigned int fd)
1118 struct files_struct *files = current->files;
1119 struct fdtable *fdt;
1122 spin_lock(&files->file_lock);
1123 fdt = files_fdtable(files);
1124 if (fd >= fdt->max_fds)
1129 rcu_assign_pointer(fdt->fd[fd], NULL);
1130 FD_CLR(fd, fdt->close_on_exec);
1131 __put_unused_fd(files, fd);
1132 spin_unlock(&files->file_lock);
1133 retval = filp_close(filp, files);
1135 /* can't restart close syscall because file table entry was cleared */
1136 if (unlikely(retval == -ERESTARTSYS ||
1137 retval == -ERESTARTNOINTR ||
1138 retval == -ERESTARTNOHAND ||
1139 retval == -ERESTART_RESTARTBLOCK))
1145 spin_unlock(&files->file_lock);
1149 EXPORT_SYMBOL(sys_close);
1152 * This routine simulates a hangup on the tty, to arrange that users
1153 * are given clean terminals at login time.
1155 asmlinkage long sys_vhangup(void)
1157 if (capable(CAP_SYS_TTY_CONFIG)) {
1158 /* XXX: this needs locking */
1159 tty_vhangup(current->signal->tty);
1166 * Called when an inode is about to be open.
1167 * We use this to disallow opening large files on 32bit systems if
1168 * the caller didn't specify O_LARGEFILE. On 64bit systems we force
1169 * on this flag in sys_open.
1171 int generic_file_open(struct inode * inode, struct file * filp)
1173 if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1178 EXPORT_SYMBOL(generic_file_open);
1181 * This is used by subsystems that don't want seekable
1184 int nonseekable_open(struct inode *inode, struct file *filp)
1186 filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
1190 EXPORT_SYMBOL(nonseekable_open);