4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/string.h>
9 #include <linux/file.h>
10 #include <linux/fdtable.h>
11 #include <linux/quotaops.h>
12 #include <linux/fsnotify.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/tty.h>
16 #include <linux/namei.h>
17 #include <linux/backing-dev.h>
18 #include <linux/capability.h>
19 #include <linux/securebits.h>
20 #include <linux/security.h>
21 #include <linux/mount.h>
22 #include <linux/vfs.h>
23 #include <linux/fcntl.h>
24 #include <asm/uaccess.h>
26 #include <linux/personality.h>
27 #include <linux/pagemap.h>
28 #include <linux/syscalls.h>
29 #include <linux/rcupdate.h>
30 #include <linux/audit.h>
31 #include <linux/falloc.h>
33 int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
39 if (dentry->d_sb->s_op->statfs) {
40 memset(buf, 0, sizeof(*buf));
41 retval = security_sb_statfs(dentry);
44 retval = dentry->d_sb->s_op->statfs(dentry, buf);
45 if (retval == 0 && buf->f_frsize == 0)
46 buf->f_frsize = buf->f_bsize;
52 EXPORT_SYMBOL(vfs_statfs);
54 static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
59 retval = vfs_statfs(dentry, &st);
63 if (sizeof(*buf) == sizeof(st))
64 memcpy(buf, &st, sizeof(st));
66 if (sizeof buf->f_blocks == 4) {
67 if ((st.f_blocks | st.f_bfree | st.f_bavail |
68 st.f_bsize | st.f_frsize) &
69 0xffffffff00000000ULL)
72 * f_files and f_ffree may be -1; it's okay to stuff
75 if (st.f_files != -1 &&
76 (st.f_files & 0xffffffff00000000ULL))
78 if (st.f_ffree != -1 &&
79 (st.f_ffree & 0xffffffff00000000ULL))
83 buf->f_type = st.f_type;
84 buf->f_bsize = st.f_bsize;
85 buf->f_blocks = st.f_blocks;
86 buf->f_bfree = st.f_bfree;
87 buf->f_bavail = st.f_bavail;
88 buf->f_files = st.f_files;
89 buf->f_ffree = st.f_ffree;
90 buf->f_fsid = st.f_fsid;
91 buf->f_namelen = st.f_namelen;
92 buf->f_frsize = st.f_frsize;
93 memset(buf->f_spare, 0, sizeof(buf->f_spare));
98 static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
103 retval = vfs_statfs(dentry, &st);
107 if (sizeof(*buf) == sizeof(st))
108 memcpy(buf, &st, sizeof(st));
110 buf->f_type = st.f_type;
111 buf->f_bsize = st.f_bsize;
112 buf->f_blocks = st.f_blocks;
113 buf->f_bfree = st.f_bfree;
114 buf->f_bavail = st.f_bavail;
115 buf->f_files = st.f_files;
116 buf->f_ffree = st.f_ffree;
117 buf->f_fsid = st.f_fsid;
118 buf->f_namelen = st.f_namelen;
119 buf->f_frsize = st.f_frsize;
120 memset(buf->f_spare, 0, sizeof(buf->f_spare));
125 asmlinkage long sys_statfs(const char __user *pathname, struct statfs __user * buf)
130 error = user_path(pathname, &path);
133 error = vfs_statfs_native(path.dentry, &tmp);
134 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
142 asmlinkage long sys_statfs64(const char __user *pathname, size_t sz, struct statfs64 __user *buf)
147 if (sz != sizeof(*buf))
149 error = user_path(pathname, &path);
152 error = vfs_statfs64(path.dentry, &tmp);
153 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
161 asmlinkage long sys_fstatfs(unsigned int fd, struct statfs __user * buf)
171 error = vfs_statfs_native(file->f_path.dentry, &tmp);
172 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
179 asmlinkage long sys_fstatfs64(unsigned int fd, size_t sz, struct statfs64 __user *buf)
185 if (sz != sizeof(*buf))
192 error = vfs_statfs64(file->f_path.dentry, &tmp);
193 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
200 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
204 struct iattr newattrs;
206 /* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
210 newattrs.ia_size = length;
211 newattrs.ia_valid = ATTR_SIZE | time_attrs;
213 newattrs.ia_file = filp;
214 newattrs.ia_valid |= ATTR_FILE;
217 /* Remove suid/sgid on truncate too */
218 newattrs.ia_valid |= should_remove_suid(dentry);
220 mutex_lock(&dentry->d_inode->i_mutex);
221 err = notify_change(dentry, &newattrs);
222 mutex_unlock(&dentry->d_inode->i_mutex);
226 static long do_sys_truncate(const char __user *pathname, loff_t length)
233 if (length < 0) /* sorry, but loff_t says... */
236 error = user_path(pathname, &path);
239 inode = path.dentry->d_inode;
241 /* For directories it's -EISDIR, for other non-regulars - -EINVAL */
243 if (S_ISDIR(inode->i_mode))
247 if (!S_ISREG(inode->i_mode))
250 error = mnt_want_write(path.mnt);
254 error = inode_permission(inode, MAY_WRITE);
256 goto mnt_drop_write_and_out;
259 if (IS_APPEND(inode))
260 goto mnt_drop_write_and_out;
262 error = get_write_access(inode);
264 goto mnt_drop_write_and_out;
267 * Make sure that there are no leases. get_write_access() protects
268 * against the truncate racing with a lease-granting setlease().
270 error = break_lease(inode, FMODE_WRITE);
272 goto put_write_and_out;
274 error = locks_verify_truncate(inode, NULL, length);
277 error = do_truncate(path.dentry, length, 0, NULL);
281 put_write_access(inode);
282 mnt_drop_write_and_out:
283 mnt_drop_write(path.mnt);
290 asmlinkage long sys_truncate(const char __user * path, unsigned long length)
292 /* on 32-bit boxen it will cut the range 2^31--2^32-1 off */
293 return do_sys_truncate(path, (long)length);
296 static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
298 struct inode * inode;
299 struct dentry *dentry;
311 /* explicitly opened as large or we are on 64-bit box */
312 if (file->f_flags & O_LARGEFILE)
315 dentry = file->f_path.dentry;
316 inode = dentry->d_inode;
318 if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
322 /* Cannot ftruncate over 2^31 bytes without large file support */
323 if (small && length > MAX_NON_LFS)
327 if (IS_APPEND(inode))
330 error = locks_verify_truncate(inode, file, length);
332 error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
339 asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length)
341 long ret = do_sys_ftruncate(fd, length, 1);
342 /* avoid REGPARM breakage on x86: */
343 asmlinkage_protect(2, ret, fd, length);
347 /* LFS versions of truncate are only needed on 32 bit machines */
348 #if BITS_PER_LONG == 32
349 asmlinkage long sys_truncate64(const char __user * path, loff_t length)
351 return do_sys_truncate(path, length);
354 asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
356 long ret = do_sys_ftruncate(fd, length, 0);
357 /* avoid REGPARM breakage on x86: */
358 asmlinkage_protect(2, ret, fd, length);
363 asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
369 if (offset < 0 || len <= 0)
372 /* Return error if mode is not supported */
374 if (mode && !(mode & FALLOC_FL_KEEP_SIZE))
381 if (!(file->f_mode & FMODE_WRITE))
384 * Revalidate the write permissions, in case security policy has
385 * changed since the files were opened.
387 ret = security_file_permission(file, MAY_WRITE);
391 inode = file->f_path.dentry->d_inode;
394 if (S_ISFIFO(inode->i_mode))
399 * Let individual file system decide if it supports preallocation
400 * for directories or not.
402 if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
406 /* Check for wrap through zero too */
407 if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
410 if (inode->i_op && inode->i_op->fallocate)
411 ret = inode->i_op->fallocate(inode, mode, offset, len);
422 * access() needs to use the real uid/gid, not the effective uid/gid.
423 * We do this by temporarily clearing all FS-related capabilities and
424 * switching the fsuid/fsgid around to the real ones.
426 asmlinkage long sys_faccessat(int dfd, const char __user *filename, int mode)
430 int old_fsuid, old_fsgid;
431 kernel_cap_t uninitialized_var(old_cap); /* !SECURE_NO_SETUID_FIXUP */
434 if (mode & ~S_IRWXO) /* where's F_OK, X_OK, W_OK, R_OK? */
437 old_fsuid = current->fsuid;
438 old_fsgid = current->fsgid;
440 current->fsuid = current->uid;
441 current->fsgid = current->gid;
443 if (!issecure(SECURE_NO_SETUID_FIXUP)) {
444 /* Clear the capabilities if we switch to a non-root user */
446 old_cap = cap_set_effective(__cap_empty_set);
448 old_cap = cap_set_effective(current->cap_permitted);
451 res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
455 inode = path.dentry->d_inode;
457 if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
459 * MAY_EXEC on regular files is denied if the fs is mounted
460 * with the "noexec" flag.
463 if (path.mnt->mnt_flags & MNT_NOEXEC)
464 goto out_path_release;
467 res = inode_permission(inode, mode | MAY_ACCESS);
468 /* SuS v2 requires we report a read only fs too */
469 if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
470 goto out_path_release;
472 * This is a rare case where using __mnt_is_readonly()
473 * is OK without a mnt_want/drop_write() pair. Since
474 * no actual write to the fs is performed here, we do
475 * not need to telegraph to that to anyone.
477 * By doing this, we accept that this access is
478 * inherently racy and know that the fs may change
479 * state before we even see this result.
481 if (__mnt_is_readonly(path.mnt))
487 current->fsuid = old_fsuid;
488 current->fsgid = old_fsgid;
490 if (!issecure(SECURE_NO_SETUID_FIXUP))
491 cap_set_effective(old_cap);
496 asmlinkage long sys_access(const char __user *filename, int mode)
498 return sys_faccessat(AT_FDCWD, filename, mode);
501 asmlinkage long sys_chdir(const char __user * filename)
506 error = user_path_dir(filename, &path);
510 error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
514 set_fs_pwd(current->fs, &path);
522 asmlinkage long sys_fchdir(unsigned int fd)
533 inode = file->f_path.dentry->d_inode;
536 if (!S_ISDIR(inode->i_mode))
539 error = inode_permission(inode, MAY_EXEC | MAY_ACCESS);
541 set_fs_pwd(current->fs, &file->f_path);
548 asmlinkage long sys_chroot(const char __user * filename)
553 error = user_path_dir(filename, &path);
557 error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
562 if (!capable(CAP_SYS_CHROOT))
565 set_fs_root(current->fs, &path);
573 asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
575 struct inode * inode;
576 struct dentry * dentry;
579 struct iattr newattrs;
585 dentry = file->f_path.dentry;
586 inode = dentry->d_inode;
588 audit_inode(NULL, dentry);
590 err = mnt_want_write(file->f_path.mnt);
593 mutex_lock(&inode->i_mutex);
594 if (mode == (mode_t) -1)
595 mode = inode->i_mode;
596 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
597 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
598 err = notify_change(dentry, &newattrs);
599 mutex_unlock(&inode->i_mutex);
600 mnt_drop_write(file->f_path.mnt);
607 asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
613 struct iattr newattrs;
615 error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
618 inode = path.dentry->d_inode;
620 error = mnt_want_write(path.mnt);
623 mutex_lock(&inode->i_mutex);
624 if (mode == (mode_t) -1)
625 mode = inode->i_mode;
626 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
627 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
628 error = notify_change(path.dentry, &newattrs);
629 mutex_unlock(&inode->i_mutex);
630 mnt_drop_write(path.mnt);
637 asmlinkage long sys_chmod(const char __user *filename, mode_t mode)
639 return sys_fchmodat(AT_FDCWD, filename, mode);
642 static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
644 struct inode *inode = dentry->d_inode;
646 struct iattr newattrs;
648 newattrs.ia_valid = ATTR_CTIME;
649 if (user != (uid_t) -1) {
650 newattrs.ia_valid |= ATTR_UID;
651 newattrs.ia_uid = user;
653 if (group != (gid_t) -1) {
654 newattrs.ia_valid |= ATTR_GID;
655 newattrs.ia_gid = group;
657 if (!S_ISDIR(inode->i_mode))
659 ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
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(filename, &path);
675 error = mnt_want_write(path.mnt);
678 error = chown_common(path.dentry, user, group);
679 mnt_drop_write(path.mnt);
686 asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
687 gid_t group, int flag)
693 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
696 follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
697 error = user_path_at(dfd, filename, follow, &path);
700 error = mnt_want_write(path.mnt);
703 error = chown_common(path.dentry, user, group);
704 mnt_drop_write(path.mnt);
711 asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
716 error = user_lpath(filename, &path);
719 error = mnt_want_write(path.mnt);
722 error = chown_common(path.dentry, user, group);
723 mnt_drop_write(path.mnt);
731 asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
735 struct dentry * dentry;
741 error = mnt_want_write(file->f_path.mnt);
744 dentry = file->f_path.dentry;
745 audit_inode(NULL, dentry);
746 error = chown_common(dentry, user, group);
747 mnt_drop_write(file->f_path.mnt);
755 * You have to be very careful that these write
756 * counts get cleaned up in error cases and
757 * upon __fput(). This should probably never
758 * be called outside of __dentry_open().
760 static inline int __get_file_write_access(struct inode *inode,
761 struct vfsmount *mnt)
764 error = get_write_access(inode);
768 * Do not take mount writer counts on
769 * special files since no writes to
770 * the mount itself will occur.
772 if (!special_file(inode->i_mode)) {
774 * Balanced in __fput()
776 error = mnt_want_write(mnt);
778 put_write_access(inode);
783 static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
784 int flags, struct file *f,
785 int (*open)(struct inode *, struct file *))
791 f->f_mode = (__force fmode_t)((flags+1) & O_ACCMODE) | FMODE_LSEEK |
792 FMODE_PREAD | FMODE_PWRITE;
793 inode = dentry->d_inode;
794 if (f->f_mode & FMODE_WRITE) {
795 error = __get_file_write_access(inode, mnt);
798 if (!special_file(inode->i_mode))
802 f->f_mapping = inode->i_mapping;
803 f->f_path.dentry = dentry;
806 f->f_op = fops_get(inode->i_fop);
807 file_move(f, &inode->i_sb->s_files);
809 error = security_dentry_open(f);
813 if (!open && f->f_op)
814 open = f->f_op->open;
816 error = open(inode, f);
821 f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
823 file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
825 /* NB: we're sure to have correct a_ops only after f_op->open */
826 if (f->f_flags & O_DIRECT) {
827 if (!f->f_mapping->a_ops ||
828 ((!f->f_mapping->a_ops->direct_IO) &&
829 (!f->f_mapping->a_ops->get_xip_mem))) {
831 f = ERR_PTR(-EINVAL);
839 if (f->f_mode & FMODE_WRITE) {
840 put_write_access(inode);
841 if (!special_file(inode->i_mode)) {
843 * We don't consider this a real
844 * mnt_want/drop_write() pair
845 * because it all happenend right
846 * here, so just reset the state.
853 f->f_path.dentry = NULL;
854 f->f_path.mnt = NULL;
859 return ERR_PTR(error);
863 * lookup_instantiate_filp - instantiates the open intent filp
864 * @nd: pointer to nameidata
865 * @dentry: pointer to dentry
866 * @open: open callback
868 * Helper for filesystems that want to use lookup open intents and pass back
869 * a fully instantiated struct file to the caller.
870 * This function is meant to be called from within a filesystem's
872 * Beware of calling it for non-regular files! Those ->open methods might block
873 * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo,
874 * leading to a deadlock, as nobody can open that fifo anymore, because
875 * another process to open fifo will block on locked parent when doing lookup).
876 * Note that in case of error, nd->intent.open.file is destroyed, but the
877 * path information remains valid.
878 * If the open callback is set to NULL, then the standard f_op->open()
879 * filesystem callback is substituted.
881 struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
882 int (*open)(struct inode *, struct file *))
884 if (IS_ERR(nd->intent.open.file))
888 nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
889 nd->intent.open.flags - 1,
890 nd->intent.open.file,
893 return nd->intent.open.file;
895 release_open_intent(nd);
896 nd->intent.open.file = (struct file *)dentry;
899 EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
902 * nameidata_to_filp - convert a nameidata to an open filp.
903 * @nd: pointer to nameidata
906 * Note that this function destroys the original nameidata
908 struct file *nameidata_to_filp(struct nameidata *nd, int flags)
912 /* Pick up the filp from the open intent */
913 filp = nd->intent.open.file;
914 /* Has the filesystem initialised the file for us? */
915 if (filp->f_path.dentry == NULL)
916 filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
924 * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
927 struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
933 * We must always pass in a valid mount pointer. Historically
934 * callers got away with not passing it, but we must enforce this at
935 * the earliest possible point now to avoid strange problems deep in the
939 printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__);
941 return ERR_PTR(-EINVAL);
945 f = get_empty_filp();
949 return ERR_PTR(error);
952 return __dentry_open(dentry, mnt, flags, f, NULL);
954 EXPORT_SYMBOL(dentry_open);
956 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
958 struct fdtable *fdt = files_fdtable(files);
959 __FD_CLR(fd, fdt->open_fds);
960 if (fd < files->next_fd)
964 void put_unused_fd(unsigned int fd)
966 struct files_struct *files = current->files;
967 spin_lock(&files->file_lock);
968 __put_unused_fd(files, fd);
969 spin_unlock(&files->file_lock);
972 EXPORT_SYMBOL(put_unused_fd);
975 * Install a file pointer in the fd array.
977 * The VFS is full of places where we drop the files lock between
978 * setting the open_fds bitmap and installing the file in the file
979 * array. At any such point, we are vulnerable to a dup2() race
980 * installing a file in the array before us. We need to detect this and
981 * fput() the struct file we are about to overwrite in this case.
983 * It should never happen - if we allow dup2() do it, _really_ bad things
987 void fd_install(unsigned int fd, struct file *file)
989 struct files_struct *files = current->files;
991 spin_lock(&files->file_lock);
992 fdt = files_fdtable(files);
993 BUG_ON(fdt->fd[fd] != NULL);
994 rcu_assign_pointer(fdt->fd[fd], file);
995 spin_unlock(&files->file_lock);
998 EXPORT_SYMBOL(fd_install);
1000 long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
1002 char *tmp = getname(filename);
1003 int fd = PTR_ERR(tmp);
1006 fd = get_unused_fd_flags(flags);
1008 struct file *f = do_filp_open(dfd, tmp, flags, mode);
1013 fsnotify_open(f->f_path.dentry);
1022 asmlinkage long sys_open(const char __user *filename, int flags, int mode)
1026 if (force_o_largefile())
1027 flags |= O_LARGEFILE;
1029 ret = do_sys_open(AT_FDCWD, filename, flags, mode);
1030 /* avoid REGPARM breakage on x86: */
1031 asmlinkage_protect(3, ret, filename, flags, mode);
1035 asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
1040 if (force_o_largefile())
1041 flags |= O_LARGEFILE;
1043 ret = do_sys_open(dfd, filename, flags, mode);
1044 /* avoid REGPARM breakage on x86: */
1045 asmlinkage_protect(4, ret, dfd, filename, flags, mode);
1052 * For backward compatibility? Maybe this should be moved
1053 * into arch/i386 instead?
1055 asmlinkage long sys_creat(const char __user * pathname, int mode)
1057 return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode);
1063 * "id" is the POSIX thread ID. We use the
1064 * files pointer for this..
1066 int filp_close(struct file *filp, fl_owner_t id)
1070 if (!file_count(filp)) {
1071 printk(KERN_ERR "VFS: Close: file count is 0\n");
1075 if (filp->f_op && filp->f_op->flush)
1076 retval = filp->f_op->flush(filp, id);
1078 dnotify_flush(filp, id);
1079 locks_remove_posix(filp, id);
1084 EXPORT_SYMBOL(filp_close);
1087 * Careful here! We test whether the file pointer is NULL before
1088 * releasing the fd. This ensures that one clone task can't release
1089 * an fd while another clone is opening it.
1091 asmlinkage long sys_close(unsigned int fd)
1094 struct files_struct *files = current->files;
1095 struct fdtable *fdt;
1098 spin_lock(&files->file_lock);
1099 fdt = files_fdtable(files);
1100 if (fd >= fdt->max_fds)
1105 rcu_assign_pointer(fdt->fd[fd], NULL);
1106 FD_CLR(fd, fdt->close_on_exec);
1107 __put_unused_fd(files, fd);
1108 spin_unlock(&files->file_lock);
1109 retval = filp_close(filp, files);
1111 /* can't restart close syscall because file table entry was cleared */
1112 if (unlikely(retval == -ERESTARTSYS ||
1113 retval == -ERESTARTNOINTR ||
1114 retval == -ERESTARTNOHAND ||
1115 retval == -ERESTART_RESTARTBLOCK))
1121 spin_unlock(&files->file_lock);
1125 EXPORT_SYMBOL(sys_close);
1128 * This routine simulates a hangup on the tty, to arrange that users
1129 * are given clean terminals at login time.
1131 asmlinkage long sys_vhangup(void)
1133 if (capable(CAP_SYS_TTY_CONFIG)) {
1141 * Called when an inode is about to be open.
1142 * We use this to disallow opening large files on 32bit systems if
1143 * the caller didn't specify O_LARGEFILE. On 64bit systems we force
1144 * on this flag in sys_open.
1146 int generic_file_open(struct inode * inode, struct file * filp)
1148 if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1153 EXPORT_SYMBOL(generic_file_open);
1156 * This is used by subsystems that don't want seekable
1159 int nonseekable_open(struct inode *inode, struct file *filp)
1161 filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
1165 EXPORT_SYMBOL(nonseekable_open);