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)) {
445 * Clear the capabilities if we switch to a non-root user
447 #ifndef CONFIG_SECURITY_FILE_CAPABILITIES
449 * FIXME: There is a race here against sys_capset. The
450 * capabilities can change yet we will restore the old
451 * value below. We should hold task_capabilities_lock,
452 * but we cannot because user_path_at can sleep.
454 #endif /* ndef CONFIG_SECURITY_FILE_CAPABILITIES */
456 old_cap = cap_set_effective(__cap_empty_set);
458 old_cap = cap_set_effective(current->cap_permitted);
461 res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
465 inode = path.dentry->d_inode;
467 if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
469 * MAY_EXEC on regular files is denied if the fs is mounted
470 * with the "noexec" flag.
473 if (path.mnt->mnt_flags & MNT_NOEXEC)
474 goto out_path_release;
477 res = inode_permission(inode, mode | MAY_ACCESS);
478 /* SuS v2 requires we report a read only fs too */
479 if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
480 goto out_path_release;
482 * This is a rare case where using __mnt_is_readonly()
483 * is OK without a mnt_want/drop_write() pair. Since
484 * no actual write to the fs is performed here, we do
485 * not need to telegraph to that to anyone.
487 * By doing this, we accept that this access is
488 * inherently racy and know that the fs may change
489 * state before we even see this result.
491 if (__mnt_is_readonly(path.mnt))
497 current->fsuid = old_fsuid;
498 current->fsgid = old_fsgid;
500 if (!issecure(SECURE_NO_SETUID_FIXUP))
501 cap_set_effective(old_cap);
506 asmlinkage long sys_access(const char __user *filename, int mode)
508 return sys_faccessat(AT_FDCWD, filename, mode);
511 asmlinkage long sys_chdir(const char __user * filename)
516 error = user_path_dir(filename, &path);
520 error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
524 set_fs_pwd(current->fs, &path);
532 asmlinkage long sys_fchdir(unsigned int fd)
543 inode = file->f_path.dentry->d_inode;
546 if (!S_ISDIR(inode->i_mode))
549 error = inode_permission(inode, MAY_EXEC | MAY_ACCESS);
551 set_fs_pwd(current->fs, &file->f_path);
558 asmlinkage long sys_chroot(const char __user * filename)
563 error = user_path_dir(filename, &path);
567 error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
572 if (!capable(CAP_SYS_CHROOT))
575 set_fs_root(current->fs, &path);
583 asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
585 struct inode * inode;
586 struct dentry * dentry;
589 struct iattr newattrs;
595 dentry = file->f_path.dentry;
596 inode = dentry->d_inode;
598 audit_inode(NULL, dentry);
600 err = mnt_want_write(file->f_path.mnt);
603 mutex_lock(&inode->i_mutex);
604 if (mode == (mode_t) -1)
605 mode = inode->i_mode;
606 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
607 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
608 err = notify_change(dentry, &newattrs);
609 mutex_unlock(&inode->i_mutex);
610 mnt_drop_write(file->f_path.mnt);
617 asmlinkage long sys_fchmodat(int dfd, const char __user *filename,
623 struct iattr newattrs;
625 error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
628 inode = path.dentry->d_inode;
630 error = mnt_want_write(path.mnt);
633 mutex_lock(&inode->i_mutex);
634 if (mode == (mode_t) -1)
635 mode = inode->i_mode;
636 newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
637 newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
638 error = notify_change(path.dentry, &newattrs);
639 mutex_unlock(&inode->i_mutex);
640 mnt_drop_write(path.mnt);
647 asmlinkage long sys_chmod(const char __user *filename, mode_t mode)
649 return sys_fchmodat(AT_FDCWD, filename, mode);
652 static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
654 struct inode *inode = dentry->d_inode;
656 struct iattr newattrs;
658 newattrs.ia_valid = ATTR_CTIME;
659 if (user != (uid_t) -1) {
660 newattrs.ia_valid |= ATTR_UID;
661 newattrs.ia_uid = user;
663 if (group != (gid_t) -1) {
664 newattrs.ia_valid |= ATTR_GID;
665 newattrs.ia_gid = group;
667 if (!S_ISDIR(inode->i_mode))
669 ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
670 mutex_lock(&inode->i_mutex);
671 error = notify_change(dentry, &newattrs);
672 mutex_unlock(&inode->i_mutex);
677 asmlinkage long sys_chown(const char __user * filename, uid_t user, gid_t group)
682 error = user_path(filename, &path);
685 error = mnt_want_write(path.mnt);
688 error = chown_common(path.dentry, user, group);
689 mnt_drop_write(path.mnt);
696 asmlinkage long sys_fchownat(int dfd, const char __user *filename, uid_t user,
697 gid_t group, int flag)
703 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
706 follow = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
707 error = user_path_at(dfd, filename, follow, &path);
710 error = mnt_want_write(path.mnt);
713 error = chown_common(path.dentry, user, group);
714 mnt_drop_write(path.mnt);
721 asmlinkage long sys_lchown(const char __user * filename, uid_t user, gid_t group)
726 error = user_lpath(filename, &path);
729 error = mnt_want_write(path.mnt);
732 error = chown_common(path.dentry, user, group);
733 mnt_drop_write(path.mnt);
741 asmlinkage long sys_fchown(unsigned int fd, uid_t user, gid_t group)
745 struct dentry * dentry;
751 error = mnt_want_write(file->f_path.mnt);
754 dentry = file->f_path.dentry;
755 audit_inode(NULL, dentry);
756 error = chown_common(dentry, user, group);
757 mnt_drop_write(file->f_path.mnt);
765 * You have to be very careful that these write
766 * counts get cleaned up in error cases and
767 * upon __fput(). This should probably never
768 * be called outside of __dentry_open().
770 static inline int __get_file_write_access(struct inode *inode,
771 struct vfsmount *mnt)
774 error = get_write_access(inode);
778 * Do not take mount writer counts on
779 * special files since no writes to
780 * the mount itself will occur.
782 if (!special_file(inode->i_mode)) {
784 * Balanced in __fput()
786 error = mnt_want_write(mnt);
788 put_write_access(inode);
793 static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
794 int flags, struct file *f,
795 int (*open)(struct inode *, struct file *))
801 f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
802 FMODE_PREAD | FMODE_PWRITE;
803 inode = dentry->d_inode;
804 if (f->f_mode & FMODE_WRITE) {
805 error = __get_file_write_access(inode, mnt);
808 if (!special_file(inode->i_mode))
812 f->f_mapping = inode->i_mapping;
813 f->f_path.dentry = dentry;
816 f->f_op = fops_get(inode->i_fop);
817 file_move(f, &inode->i_sb->s_files);
819 error = security_dentry_open(f);
823 if (!open && f->f_op)
824 open = f->f_op->open;
826 error = open(inode, f);
831 f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
833 file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
835 /* NB: we're sure to have correct a_ops only after f_op->open */
836 if (f->f_flags & O_DIRECT) {
837 if (!f->f_mapping->a_ops ||
838 ((!f->f_mapping->a_ops->direct_IO) &&
839 (!f->f_mapping->a_ops->get_xip_mem))) {
841 f = ERR_PTR(-EINVAL);
849 if (f->f_mode & FMODE_WRITE) {
850 put_write_access(inode);
851 if (!special_file(inode->i_mode)) {
853 * We don't consider this a real
854 * mnt_want/drop_write() pair
855 * because it all happenend right
856 * here, so just reset the state.
863 f->f_path.dentry = NULL;
864 f->f_path.mnt = NULL;
869 return ERR_PTR(error);
873 * lookup_instantiate_filp - instantiates the open intent filp
874 * @nd: pointer to nameidata
875 * @dentry: pointer to dentry
876 * @open: open callback
878 * Helper for filesystems that want to use lookup open intents and pass back
879 * a fully instantiated struct file to the caller.
880 * This function is meant to be called from within a filesystem's
882 * Beware of calling it for non-regular files! Those ->open methods might block
883 * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo,
884 * leading to a deadlock, as nobody can open that fifo anymore, because
885 * another process to open fifo will block on locked parent when doing lookup).
886 * Note that in case of error, nd->intent.open.file is destroyed, but the
887 * path information remains valid.
888 * If the open callback is set to NULL, then the standard f_op->open()
889 * filesystem callback is substituted.
891 struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
892 int (*open)(struct inode *, struct file *))
894 if (IS_ERR(nd->intent.open.file))
898 nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
899 nd->intent.open.flags - 1,
900 nd->intent.open.file,
903 return nd->intent.open.file;
905 release_open_intent(nd);
906 nd->intent.open.file = (struct file *)dentry;
909 EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
912 * nameidata_to_filp - convert a nameidata to an open filp.
913 * @nd: pointer to nameidata
916 * Note that this function destroys the original nameidata
918 struct file *nameidata_to_filp(struct nameidata *nd, int flags)
922 /* Pick up the filp from the open intent */
923 filp = nd->intent.open.file;
924 /* Has the filesystem initialised the file for us? */
925 if (filp->f_path.dentry == NULL)
926 filp = __dentry_open(nd->path.dentry, nd->path.mnt, flags, filp,
934 * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
937 struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
943 * We must always pass in a valid mount pointer. Historically
944 * callers got away with not passing it, but we must enforce this at
945 * the earliest possible point now to avoid strange problems deep in the
949 printk(KERN_WARNING "%s called with NULL vfsmount\n", __func__);
951 return ERR_PTR(-EINVAL);
955 f = get_empty_filp();
959 return ERR_PTR(error);
962 return __dentry_open(dentry, mnt, flags, f, NULL);
964 EXPORT_SYMBOL(dentry_open);
966 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
968 struct fdtable *fdt = files_fdtable(files);
969 __FD_CLR(fd, fdt->open_fds);
970 if (fd < files->next_fd)
974 void put_unused_fd(unsigned int fd)
976 struct files_struct *files = current->files;
977 spin_lock(&files->file_lock);
978 __put_unused_fd(files, fd);
979 spin_unlock(&files->file_lock);
982 EXPORT_SYMBOL(put_unused_fd);
985 * Install a file pointer in the fd array.
987 * The VFS is full of places where we drop the files lock between
988 * setting the open_fds bitmap and installing the file in the file
989 * array. At any such point, we are vulnerable to a dup2() race
990 * installing a file in the array before us. We need to detect this and
991 * fput() the struct file we are about to overwrite in this case.
993 * It should never happen - if we allow dup2() do it, _really_ bad things
997 void fd_install(unsigned int fd, struct file *file)
999 struct files_struct *files = current->files;
1000 struct fdtable *fdt;
1001 spin_lock(&files->file_lock);
1002 fdt = files_fdtable(files);
1003 BUG_ON(fdt->fd[fd] != NULL);
1004 rcu_assign_pointer(fdt->fd[fd], file);
1005 spin_unlock(&files->file_lock);
1008 EXPORT_SYMBOL(fd_install);
1010 long do_sys_open(int dfd, const char __user *filename, int flags, int mode)
1012 char *tmp = getname(filename);
1013 int fd = PTR_ERR(tmp);
1016 fd = get_unused_fd_flags(flags);
1018 struct file *f = do_filp_open(dfd, tmp, flags, mode);
1023 fsnotify_open(f->f_path.dentry);
1032 asmlinkage long sys_open(const char __user *filename, int flags, int mode)
1036 if (force_o_largefile())
1037 flags |= O_LARGEFILE;
1039 ret = do_sys_open(AT_FDCWD, filename, flags, mode);
1040 /* avoid REGPARM breakage on x86: */
1041 asmlinkage_protect(3, ret, filename, flags, mode);
1045 asmlinkage long sys_openat(int dfd, const char __user *filename, int flags,
1050 if (force_o_largefile())
1051 flags |= O_LARGEFILE;
1053 ret = do_sys_open(dfd, filename, flags, mode);
1054 /* avoid REGPARM breakage on x86: */
1055 asmlinkage_protect(4, ret, dfd, filename, flags, mode);
1062 * For backward compatibility? Maybe this should be moved
1063 * into arch/i386 instead?
1065 asmlinkage long sys_creat(const char __user * pathname, int mode)
1067 return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode);
1073 * "id" is the POSIX thread ID. We use the
1074 * files pointer for this..
1076 int filp_close(struct file *filp, fl_owner_t id)
1080 if (!file_count(filp)) {
1081 printk(KERN_ERR "VFS: Close: file count is 0\n");
1085 if (filp->f_op && filp->f_op->flush)
1086 retval = filp->f_op->flush(filp, id);
1088 dnotify_flush(filp, id);
1089 locks_remove_posix(filp, id);
1094 EXPORT_SYMBOL(filp_close);
1097 * Careful here! We test whether the file pointer is NULL before
1098 * releasing the fd. This ensures that one clone task can't release
1099 * an fd while another clone is opening it.
1101 asmlinkage long sys_close(unsigned int fd)
1104 struct files_struct *files = current->files;
1105 struct fdtable *fdt;
1108 spin_lock(&files->file_lock);
1109 fdt = files_fdtable(files);
1110 if (fd >= fdt->max_fds)
1115 rcu_assign_pointer(fdt->fd[fd], NULL);
1116 FD_CLR(fd, fdt->close_on_exec);
1117 __put_unused_fd(files, fd);
1118 spin_unlock(&files->file_lock);
1119 retval = filp_close(filp, files);
1121 /* can't restart close syscall because file table entry was cleared */
1122 if (unlikely(retval == -ERESTARTSYS ||
1123 retval == -ERESTARTNOINTR ||
1124 retval == -ERESTARTNOHAND ||
1125 retval == -ERESTART_RESTARTBLOCK))
1131 spin_unlock(&files->file_lock);
1135 EXPORT_SYMBOL(sys_close);
1138 * This routine simulates a hangup on the tty, to arrange that users
1139 * are given clean terminals at login time.
1141 asmlinkage long sys_vhangup(void)
1143 if (capable(CAP_SYS_TTY_CONFIG)) {
1151 * Called when an inode is about to be open.
1152 * We use this to disallow opening large files on 32bit systems if
1153 * the caller didn't specify O_LARGEFILE. On 64bit systems we force
1154 * on this flag in sys_open.
1156 int generic_file_open(struct inode * inode, struct file * filp)
1158 if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
1163 EXPORT_SYMBOL(generic_file_open);
1166 * This is used by subsystems that don't want seekable
1169 int nonseekable_open(struct inode *inode, struct file *filp)
1171 filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
1175 EXPORT_SYMBOL(nonseekable_open);