2005-04-16 16:20:36 -06:00
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/* -*- c -*- --------------------------------------------------------------- *
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*
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* linux/fs/autofs/root.c
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*
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* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
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* Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
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2006-03-27 02:14:54 -07:00
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* Copyright 2001-2006 Ian Kent <raven@themaw.net>
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2005-04-16 16:20:36 -06:00
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*
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* This file is part of the Linux kernel and is made available under
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* the terms of the GNU General Public License, version 2, or at your
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* option, any later version, incorporated herein by reference.
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*
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* ------------------------------------------------------------------------- */
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2006-01-11 13:17:46 -07:00
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#include <linux/capability.h>
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2005-04-16 16:20:36 -06:00
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#include <linux/errno.h>
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#include <linux/stat.h>
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#include <linux/param.h>
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#include <linux/time.h>
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#include <linux/smp_lock.h>
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#include "autofs_i.h"
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static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
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static int autofs4_dir_unlink(struct inode *,struct dentry *);
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static int autofs4_dir_rmdir(struct inode *,struct dentry *);
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static int autofs4_dir_mkdir(struct inode *,struct dentry *,int);
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static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
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static int autofs4_dir_open(struct inode *inode, struct file *file);
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static int autofs4_dir_close(struct inode *inode, struct file *file);
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static int autofs4_dir_readdir(struct file * filp, void * dirent, filldir_t filldir);
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static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t filldir);
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static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
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2006-03-27 02:14:54 -07:00
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static void *autofs4_follow_link(struct dentry *, struct nameidata *);
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2005-04-16 16:20:36 -06:00
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2006-03-28 02:56:42 -07:00
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const struct file_operations autofs4_root_operations = {
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2005-04-16 16:20:36 -06:00
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.open = dcache_dir_open,
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.release = dcache_dir_close,
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.read = generic_read_dir,
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.readdir = autofs4_root_readdir,
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.ioctl = autofs4_root_ioctl,
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};
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2006-03-28 02:56:42 -07:00
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const struct file_operations autofs4_dir_operations = {
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2005-04-16 16:20:36 -06:00
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.open = autofs4_dir_open,
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.release = autofs4_dir_close,
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.read = generic_read_dir,
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.readdir = autofs4_dir_readdir,
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};
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2006-03-27 02:14:54 -07:00
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struct inode_operations autofs4_indirect_root_inode_operations = {
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2005-04-16 16:20:36 -06:00
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.lookup = autofs4_lookup,
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.unlink = autofs4_dir_unlink,
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.symlink = autofs4_dir_symlink,
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.mkdir = autofs4_dir_mkdir,
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.rmdir = autofs4_dir_rmdir,
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};
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2006-03-27 02:14:54 -07:00
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struct inode_operations autofs4_direct_root_inode_operations = {
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.lookup = autofs4_lookup,
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2006-03-27 02:14:58 -07:00
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.unlink = autofs4_dir_unlink,
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.mkdir = autofs4_dir_mkdir,
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.rmdir = autofs4_dir_rmdir,
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2006-03-27 02:14:54 -07:00
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.follow_link = autofs4_follow_link,
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};
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2005-04-16 16:20:36 -06:00
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struct inode_operations autofs4_dir_inode_operations = {
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.lookup = autofs4_lookup,
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.unlink = autofs4_dir_unlink,
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.symlink = autofs4_dir_symlink,
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.mkdir = autofs4_dir_mkdir,
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.rmdir = autofs4_dir_rmdir,
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};
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static int autofs4_root_readdir(struct file *file, void *dirent,
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filldir_t filldir)
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{
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struct autofs_sb_info *sbi = autofs4_sbi(file->f_dentry->d_sb);
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int oz_mode = autofs4_oz_mode(sbi);
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DPRINTK("called, filp->f_pos = %lld", file->f_pos);
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/*
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* Don't set reghost flag if:
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* 1) f_pos is larger than zero -- we've already been here.
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* 2) we haven't even enabled reghosting in the 1st place.
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* 3) this is the daemon doing a readdir
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*/
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if (oz_mode && file->f_pos == 0 && sbi->reghost_enabled)
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sbi->needs_reghost = 1;
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DPRINTK("needs_reghost = %d", sbi->needs_reghost);
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2006-03-27 02:14:43 -07:00
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return dcache_readdir(file, dirent, filldir);
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2005-04-16 16:20:36 -06:00
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}
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static int autofs4_dir_open(struct inode *inode, struct file *file)
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{
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struct dentry *dentry = file->f_dentry;
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struct vfsmount *mnt = file->f_vfsmnt;
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struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
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2006-03-27 02:14:43 -07:00
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struct dentry *cursor;
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2005-04-16 16:20:36 -06:00
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int status;
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2006-03-27 02:14:43 -07:00
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status = dcache_dir_open(inode, file);
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if (status)
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goto out;
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cursor = file->private_data;
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cursor->d_fsdata = NULL;
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2005-04-16 16:20:36 -06:00
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DPRINTK("file=%p dentry=%p %.*s",
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file, dentry, dentry->d_name.len, dentry->d_name.name);
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if (autofs4_oz_mode(sbi))
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goto out;
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if (autofs4_ispending(dentry)) {
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DPRINTK("dentry busy");
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2006-03-27 02:14:43 -07:00
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dcache_dir_close(inode, file);
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status = -EBUSY;
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goto out;
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2005-04-16 16:20:36 -06:00
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}
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2006-03-27 02:14:43 -07:00
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status = -ENOENT;
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2005-04-16 16:20:36 -06:00
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if (!d_mountpoint(dentry) && dentry->d_op && dentry->d_op->d_revalidate) {
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struct nameidata nd;
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2006-03-27 02:14:43 -07:00
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int empty, ret;
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2005-04-16 16:20:36 -06:00
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/* In case there are stale directory dentrys from a failed mount */
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spin_lock(&dcache_lock);
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empty = list_empty(&dentry->d_subdirs);
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spin_unlock(&dcache_lock);
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if (!empty)
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d_invalidate(dentry);
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nd.flags = LOOKUP_DIRECTORY;
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2006-03-27 02:14:43 -07:00
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ret = (dentry->d_op->d_revalidate)(dentry, &nd);
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2005-04-16 16:20:36 -06:00
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2006-09-27 02:50:44 -06:00
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if (ret <= 0) {
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if (ret < 0)
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status = ret;
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2006-03-27 02:14:43 -07:00
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dcache_dir_close(inode, file);
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goto out;
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}
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2005-04-16 16:20:36 -06:00
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}
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if (d_mountpoint(dentry)) {
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struct file *fp = NULL;
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struct vfsmount *fp_mnt = mntget(mnt);
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struct dentry *fp_dentry = dget(dentry);
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2005-06-21 18:16:38 -06:00
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if (!autofs4_follow_mount(&fp_mnt, &fp_dentry)) {
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dput(fp_dentry);
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mntput(fp_mnt);
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2006-03-27 02:14:43 -07:00
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dcache_dir_close(inode, file);
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goto out;
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2005-06-21 18:16:38 -06:00
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}
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2005-04-16 16:20:36 -06:00
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fp = dentry_open(fp_dentry, fp_mnt, file->f_flags);
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status = PTR_ERR(fp);
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if (IS_ERR(fp)) {
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2006-03-27 02:14:43 -07:00
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dcache_dir_close(inode, file);
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goto out;
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2005-04-16 16:20:36 -06:00
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}
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2006-03-27 02:14:43 -07:00
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cursor->d_fsdata = fp;
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2005-04-16 16:20:36 -06:00
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}
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return 0;
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2006-03-27 02:14:43 -07:00
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out:
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return status;
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2005-04-16 16:20:36 -06:00
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}
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static int autofs4_dir_close(struct inode *inode, struct file *file)
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{
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struct dentry *dentry = file->f_dentry;
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struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
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2006-03-27 02:14:43 -07:00
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struct dentry *cursor = file->private_data;
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int status = 0;
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2005-04-16 16:20:36 -06:00
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DPRINTK("file=%p dentry=%p %.*s",
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file, dentry, dentry->d_name.len, dentry->d_name.name);
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if (autofs4_oz_mode(sbi))
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goto out;
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if (autofs4_ispending(dentry)) {
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DPRINTK("dentry busy");
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2006-03-27 02:14:43 -07:00
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status = -EBUSY;
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goto out;
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2005-04-16 16:20:36 -06:00
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}
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if (d_mountpoint(dentry)) {
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2006-03-27 02:14:43 -07:00
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struct file *fp = cursor->d_fsdata;
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if (!fp) {
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status = -ENOENT;
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goto out;
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}
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2005-04-16 16:20:36 -06:00
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filp_close(fp, current->files);
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}
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out:
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2006-03-27 02:14:43 -07:00
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dcache_dir_close(inode, file);
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return status;
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2005-04-16 16:20:36 -06:00
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}
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static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldir)
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{
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struct dentry *dentry = file->f_dentry;
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struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
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2006-03-27 02:14:43 -07:00
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struct dentry *cursor = file->private_data;
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2005-04-16 16:20:36 -06:00
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int status;
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DPRINTK("file=%p dentry=%p %.*s",
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file, dentry, dentry->d_name.len, dentry->d_name.name);
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if (autofs4_oz_mode(sbi))
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goto out;
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if (autofs4_ispending(dentry)) {
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DPRINTK("dentry busy");
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return -EBUSY;
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}
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if (d_mountpoint(dentry)) {
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2006-03-27 02:14:43 -07:00
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struct file *fp = cursor->d_fsdata;
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2005-04-16 16:20:36 -06:00
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if (!fp)
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return -ENOENT;
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if (!fp->f_op || !fp->f_op->readdir)
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goto out;
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status = vfs_readdir(fp, filldir, dirent);
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file->f_pos = fp->f_pos;
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if (status)
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autofs4_copy_atime(file, fp);
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return status;
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}
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out:
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2006-03-27 02:14:43 -07:00
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return dcache_readdir(file, dirent, filldir);
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2005-04-16 16:20:36 -06:00
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}
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2006-03-27 02:14:48 -07:00
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static int try_to_fill_dentry(struct dentry *dentry, int flags)
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2005-04-16 16:20:36 -06:00
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{
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2006-03-27 02:14:48 -07:00
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struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
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2006-03-27 02:14:42 -07:00
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struct autofs_info *ino = autofs4_dentry_ino(dentry);
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2005-04-16 16:20:36 -06:00
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int status = 0;
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/* Block on any pending expiry here; invalidate the dentry
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when expiration is done to trigger mount request with a new
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dentry */
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2006-03-27 02:14:42 -07:00
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if (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
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2005-04-16 16:20:36 -06:00
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DPRINTK("waiting for expire %p name=%.*s",
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dentry, dentry->d_name.len, dentry->d_name.name);
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status = autofs4_wait(sbi, dentry, NFY_NONE);
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2006-03-27 02:14:42 -07:00
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2005-04-16 16:20:36 -06:00
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DPRINTK("expire done status=%d", status);
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2006-03-27 02:14:42 -07:00
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2005-06-21 18:16:41 -06:00
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/*
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* If the directory still exists the mount request must
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* continue otherwise it can't be followed at the right
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* time during the walk.
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*/
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status = d_invalidate(dentry);
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if (status != -EBUSY)
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2006-03-27 02:14:54 -07:00
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return -ENOENT;
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2005-04-16 16:20:36 -06:00
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}
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DPRINTK("dentry=%p %.*s ino=%p",
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dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
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2006-03-27 02:14:42 -07:00
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/*
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* Wait for a pending mount, triggering one if there
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* isn't one already
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*/
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2005-04-16 16:20:36 -06:00
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if (dentry->d_inode == NULL) {
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DPRINTK("waiting for mount name=%.*s",
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dentry->d_name.len, dentry->d_name.name);
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status = autofs4_wait(sbi, dentry, NFY_MOUNT);
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2006-03-27 02:14:42 -07:00
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2005-04-16 16:20:36 -06:00
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DPRINTK("mount done status=%d", status);
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if (status && dentry->d_inode)
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2006-03-27 02:14:54 -07:00
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return status; /* Try to get the kernel to invalidate this dentry */
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2006-03-27 02:14:42 -07:00
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2005-04-16 16:20:36 -06:00
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/* Turn this into a real negative dentry? */
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if (status == -ENOENT) {
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spin_lock(&dentry->d_lock);
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dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
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spin_unlock(&dentry->d_lock);
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2006-03-27 02:14:54 -07:00
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return status;
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2005-04-16 16:20:36 -06:00
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} else if (status) {
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/* Return a negative dentry, but leave it "pending" */
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2006-03-27 02:14:54 -07:00
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return status;
|
2005-04-16 16:20:36 -06:00
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}
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/* Trigger mount for path component or follow link */
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} else if (flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) ||
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current->link_count) {
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DPRINTK("waiting for mount name=%.*s",
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dentry->d_name.len, dentry->d_name.name);
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spin_lock(&dentry->d_lock);
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dentry->d_flags |= DCACHE_AUTOFS_PENDING;
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spin_unlock(&dentry->d_lock);
|
|
|
|
status = autofs4_wait(sbi, dentry, NFY_MOUNT);
|
|
|
|
|
|
|
|
DPRINTK("mount done status=%d", status);
|
|
|
|
|
|
|
|
if (status) {
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
|
|
|
|
spin_unlock(&dentry->d_lock);
|
2006-03-27 02:14:54 -07:00
|
|
|
return status;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-03-27 02:14:47 -07:00
|
|
|
/* Initialize expiry counter after successful mount */
|
|
|
|
if (ino)
|
|
|
|
ino->last_used = jiffies;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
|
|
|
|
spin_unlock(&dentry->d_lock);
|
2006-03-27 02:14:54 -07:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* For autofs direct mounts the follow link triggers the mount */
|
|
|
|
static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
|
2006-05-15 10:43:51 -06:00
|
|
|
struct autofs_info *ino = autofs4_dentry_ino(dentry);
|
2006-03-27 02:14:54 -07:00
|
|
|
int oz_mode = autofs4_oz_mode(sbi);
|
|
|
|
unsigned int lookup_type;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d",
|
|
|
|
dentry, dentry->d_name.len, dentry->d_name.name, oz_mode,
|
|
|
|
nd->flags);
|
|
|
|
|
|
|
|
/* If it's our master or we shouldn't trigger a mount we're done */
|
|
|
|
lookup_type = nd->flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY);
|
|
|
|
if (oz_mode || !lookup_type)
|
|
|
|
goto done;
|
|
|
|
|
2006-05-15 10:43:51 -06:00
|
|
|
/* If an expire request is pending wait for it. */
|
|
|
|
if (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
|
2006-03-27 02:14:58 -07:00
|
|
|
DPRINTK("waiting for active request %p name=%.*s",
|
|
|
|
dentry, dentry->d_name.len, dentry->d_name.name);
|
|
|
|
|
|
|
|
status = autofs4_wait(sbi, dentry, NFY_NONE);
|
|
|
|
|
|
|
|
DPRINTK("request done status=%d", status);
|
|
|
|
}
|
2006-03-27 02:14:54 -07:00
|
|
|
|
2006-03-27 02:14:58 -07:00
|
|
|
/*
|
|
|
|
* If the dentry contains directories then it is an
|
|
|
|
* autofs multi-mount with no root mount offset. So
|
|
|
|
* don't try to mount it again.
|
|
|
|
*/
|
|
|
|
spin_lock(&dcache_lock);
|
2006-09-29 03:00:53 -06:00
|
|
|
if (!d_mountpoint(dentry) && __simple_empty(dentry)) {
|
2006-03-27 02:14:58 -07:00
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
|
|
|
|
status = try_to_fill_dentry(dentry, 0);
|
|
|
|
if (status)
|
|
|
|
goto out_error;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The mount succeeded but if there is no root mount
|
|
|
|
* it must be an autofs multi-mount with no root offset
|
|
|
|
* so we don't need to follow the mount.
|
|
|
|
*/
|
|
|
|
if (d_mountpoint(dentry)) {
|
|
|
|
if (!autofs4_follow_mount(&nd->mnt, &nd->dentry)) {
|
|
|
|
status = -ENOENT;
|
|
|
|
goto out_error;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
goto done;
|
2006-03-27 02:14:54 -07:00
|
|
|
}
|
2006-03-27 02:14:58 -07:00
|
|
|
spin_unlock(&dcache_lock);
|
2006-03-27 02:14:54 -07:00
|
|
|
|
|
|
|
done:
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
out_error:
|
|
|
|
path_release(nd);
|
|
|
|
return ERR_PTR(status);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Revalidate is called on every cache lookup. Some of those
|
|
|
|
* cache lookups may actually happen while the dentry is not
|
|
|
|
* yet completely filled in, and revalidate has to delay such
|
|
|
|
* lookups..
|
|
|
|
*/
|
2006-03-27 02:14:42 -07:00
|
|
|
static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2006-03-27 02:14:42 -07:00
|
|
|
struct inode *dir = dentry->d_parent->d_inode;
|
2005-04-16 16:20:36 -06:00
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
int oz_mode = autofs4_oz_mode(sbi);
|
|
|
|
int flags = nd ? nd->flags : 0;
|
2006-09-27 02:50:44 -06:00
|
|
|
int status = 1;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Pending dentry */
|
|
|
|
if (autofs4_ispending(dentry)) {
|
2006-09-27 02:50:44 -06:00
|
|
|
/* The daemon never causes a mount to trigger */
|
|
|
|
if (oz_mode)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A zero status is success otherwise we have a
|
|
|
|
* negative error code.
|
|
|
|
*/
|
|
|
|
status = try_to_fill_dentry(dentry, flags);
|
|
|
|
if (status == 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return status;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/* Negative dentry.. invalidate if "old" */
|
|
|
|
if (dentry->d_inode == NULL)
|
2006-03-27 02:14:44 -07:00
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* Check for a non-mountpoint directory with no contents */
|
|
|
|
spin_lock(&dcache_lock);
|
|
|
|
if (S_ISDIR(dentry->d_inode->i_mode) &&
|
|
|
|
!d_mountpoint(dentry) &&
|
2006-03-27 02:14:50 -07:00
|
|
|
__simple_empty(dentry)) {
|
2005-04-16 16:20:36 -06:00
|
|
|
DPRINTK("dentry=%p %.*s, emptydir",
|
|
|
|
dentry, dentry->d_name.len, dentry->d_name.name);
|
|
|
|
spin_unlock(&dcache_lock);
|
2006-09-27 02:50:44 -06:00
|
|
|
/* The daemon never causes a mount to trigger */
|
|
|
|
if (oz_mode)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* A zero status is success otherwise we have a
|
|
|
|
* negative error code.
|
|
|
|
*/
|
|
|
|
status = try_to_fill_dentry(dentry, flags);
|
|
|
|
if (status == 0)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return status;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2006-03-27 02:14:54 -07:00
|
|
|
void autofs4_dentry_release(struct dentry *de)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct autofs_info *inf;
|
|
|
|
|
|
|
|
DPRINTK("releasing %p", de);
|
|
|
|
|
|
|
|
inf = autofs4_dentry_ino(de);
|
|
|
|
de->d_fsdata = NULL;
|
|
|
|
|
|
|
|
if (inf) {
|
|
|
|
inf->dentry = NULL;
|
|
|
|
inf->inode = NULL;
|
|
|
|
|
|
|
|
autofs4_free_ino(inf);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* For dentries of directories in the root dir */
|
|
|
|
static struct dentry_operations autofs4_root_dentry_operations = {
|
|
|
|
.d_revalidate = autofs4_revalidate,
|
|
|
|
.d_release = autofs4_dentry_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
/* For other dentries */
|
|
|
|
static struct dentry_operations autofs4_dentry_operations = {
|
|
|
|
.d_revalidate = autofs4_revalidate,
|
|
|
|
.d_release = autofs4_dentry_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Lookups in the root directory */
|
|
|
|
static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi;
|
|
|
|
int oz_mode;
|
|
|
|
|
|
|
|
DPRINTK("name = %.*s",
|
|
|
|
dentry->d_name.len, dentry->d_name.name);
|
|
|
|
|
2006-03-27 02:14:42 -07:00
|
|
|
/* File name too long to exist */
|
2005-04-16 16:20:36 -06:00
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
2006-03-27 02:14:42 -07:00
|
|
|
return ERR_PTR(-ENAMETOOLONG);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
oz_mode = autofs4_oz_mode(sbi);
|
2006-03-27 02:14:42 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
|
|
|
|
current->pid, process_group(current), sbi->catatonic, oz_mode);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Mark the dentry incomplete, but add it. This is needed so
|
|
|
|
* that the VFS layer knows about the dentry, and we can count
|
|
|
|
* on catching any lookups through the revalidate.
|
|
|
|
*
|
|
|
|
* Let all the hard work be done by the revalidate function that
|
|
|
|
* needs to be able to do this anyway..
|
|
|
|
*
|
|
|
|
* We need to do this before we release the directory semaphore.
|
|
|
|
*/
|
|
|
|
dentry->d_op = &autofs4_root_dentry_operations;
|
|
|
|
|
|
|
|
if (!oz_mode) {
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
dentry->d_flags |= DCACHE_AUTOFS_PENDING;
|
|
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
}
|
|
|
|
dentry->d_fsdata = NULL;
|
|
|
|
d_add(dentry, NULL);
|
|
|
|
|
|
|
|
if (dentry->d_op && dentry->d_op->d_revalidate) {
|
2006-01-09 16:59:24 -07:00
|
|
|
mutex_unlock(&dir->i_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
(dentry->d_op->d_revalidate)(dentry, nd);
|
2006-01-09 16:59:24 -07:00
|
|
|
mutex_lock(&dir->i_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If we are still pending, check if we had to handle
|
|
|
|
* a signal. If so we can force a restart..
|
|
|
|
*/
|
|
|
|
if (dentry->d_flags & DCACHE_AUTOFS_PENDING) {
|
|
|
|
/* See if we were interrupted */
|
|
|
|
if (signal_pending(current)) {
|
|
|
|
sigset_t *sigset = ¤t->pending.signal;
|
|
|
|
if (sigismember (sigset, SIGKILL) ||
|
|
|
|
sigismember (sigset, SIGQUIT) ||
|
|
|
|
sigismember (sigset, SIGINT)) {
|
|
|
|
return ERR_PTR(-ERESTARTNOINTR);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If this dentry is unhashed, then we shouldn't honour this
|
|
|
|
* lookup even if the dentry is positive. Returning ENOENT here
|
|
|
|
* doesn't do the right thing for all system calls, but it should
|
|
|
|
* be OK for the operations we permit from an autofs.
|
|
|
|
*/
|
2006-03-27 02:14:42 -07:00
|
|
|
if (dentry->d_inode && d_unhashed(dentry))
|
2005-04-16 16:20:36 -06:00
|
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int autofs4_dir_symlink(struct inode *dir,
|
|
|
|
struct dentry *dentry,
|
|
|
|
const char *symname)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
struct autofs_info *ino = autofs4_dentry_ino(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
struct autofs_info *p_ino;
|
2005-04-16 16:20:36 -06:00
|
|
|
struct inode *inode;
|
|
|
|
char *cp;
|
|
|
|
|
|
|
|
DPRINTK("%s <- %.*s", symname,
|
|
|
|
dentry->d_name.len, dentry->d_name.name);
|
|
|
|
|
|
|
|
if (!autofs4_oz_mode(sbi))
|
|
|
|
return -EACCES;
|
|
|
|
|
|
|
|
ino = autofs4_init_ino(ino, sbi, S_IFLNK | 0555);
|
|
|
|
if (ino == NULL)
|
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
ino->size = strlen(symname);
|
|
|
|
ino->u.symlink = cp = kmalloc(ino->size + 1, GFP_KERNEL);
|
|
|
|
|
|
|
|
if (cp == NULL) {
|
|
|
|
kfree(ino);
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
|
|
|
|
|
|
|
strcpy(cp, symname);
|
|
|
|
|
|
|
|
inode = autofs4_get_inode(dir->i_sb, ino);
|
|
|
|
d_instantiate(dentry, inode);
|
|
|
|
|
|
|
|
if (dir == dir->i_sb->s_root->d_inode)
|
|
|
|
dentry->d_op = &autofs4_root_dentry_operations;
|
|
|
|
else
|
|
|
|
dentry->d_op = &autofs4_dentry_operations;
|
|
|
|
|
|
|
|
dentry->d_fsdata = ino;
|
|
|
|
ino->dentry = dget(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
atomic_inc(&ino->count);
|
|
|
|
p_ino = autofs4_dentry_ino(dentry->d_parent);
|
|
|
|
if (p_ino && dentry->d_parent != dentry)
|
|
|
|
atomic_inc(&p_ino->count);
|
2005-04-16 16:20:36 -06:00
|
|
|
ino->inode = inode;
|
|
|
|
|
|
|
|
dir->i_mtime = CURRENT_TIME;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* NOTE!
|
|
|
|
*
|
|
|
|
* Normal filesystems would do a "d_delete()" to tell the VFS dcache
|
|
|
|
* that the file no longer exists. However, doing that means that the
|
|
|
|
* VFS layer can turn the dentry into a negative dentry. We don't want
|
|
|
|
* this, because since the unlink is probably the result of an expire.
|
|
|
|
* We simply d_drop it, which allows the dentry lookup to remount it
|
|
|
|
* if necessary.
|
|
|
|
*
|
|
|
|
* If a process is blocked on the dentry waiting for the expire to finish,
|
|
|
|
* it will invalidate the dentry and try to mount with a new one.
|
|
|
|
*
|
|
|
|
* Also see autofs4_dir_rmdir()..
|
|
|
|
*/
|
|
|
|
static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
struct autofs_info *ino = autofs4_dentry_ino(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
struct autofs_info *p_ino;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/* This allows root to remove symlinks */
|
|
|
|
if ( !autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN) )
|
|
|
|
return -EACCES;
|
|
|
|
|
2006-03-27 02:14:46 -07:00
|
|
|
if (atomic_dec_and_test(&ino->count)) {
|
|
|
|
p_ino = autofs4_dentry_ino(dentry->d_parent);
|
|
|
|
if (p_ino && dentry->d_parent != dentry)
|
|
|
|
atomic_dec(&p_ino->count);
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
dput(ino->dentry);
|
|
|
|
|
|
|
|
dentry->d_inode->i_size = 0;
|
|
|
|
dentry->d_inode->i_nlink = 0;
|
|
|
|
|
|
|
|
dir->i_mtime = CURRENT_TIME;
|
|
|
|
|
|
|
|
d_drop(dentry);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
struct autofs_info *ino = autofs4_dentry_ino(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
struct autofs_info *p_ino;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
if (!autofs4_oz_mode(sbi))
|
|
|
|
return -EACCES;
|
|
|
|
|
|
|
|
spin_lock(&dcache_lock);
|
|
|
|
if (!list_empty(&dentry->d_subdirs)) {
|
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
return -ENOTEMPTY;
|
|
|
|
}
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
|
|
__d_drop(dentry);
|
|
|
|
spin_unlock(&dentry->d_lock);
|
|
|
|
spin_unlock(&dcache_lock);
|
|
|
|
|
2006-03-27 02:14:46 -07:00
|
|
|
if (atomic_dec_and_test(&ino->count)) {
|
|
|
|
p_ino = autofs4_dentry_ino(dentry->d_parent);
|
|
|
|
if (p_ino && dentry->d_parent != dentry)
|
|
|
|
atomic_dec(&p_ino->count);
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
dput(ino->dentry);
|
|
|
|
dentry->d_inode->i_size = 0;
|
|
|
|
dentry->d_inode->i_nlink = 0;
|
|
|
|
|
|
|
|
if (dir->i_nlink)
|
|
|
|
dir->i_nlink--;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
|
|
|
|
struct autofs_info *ino = autofs4_dentry_ino(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
struct autofs_info *p_ino;
|
2005-04-16 16:20:36 -06:00
|
|
|
struct inode *inode;
|
|
|
|
|
|
|
|
if ( !autofs4_oz_mode(sbi) )
|
|
|
|
return -EACCES;
|
|
|
|
|
|
|
|
DPRINTK("dentry %p, creating %.*s",
|
|
|
|
dentry, dentry->d_name.len, dentry->d_name.name);
|
|
|
|
|
|
|
|
ino = autofs4_init_ino(ino, sbi, S_IFDIR | 0555);
|
|
|
|
if (ino == NULL)
|
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
inode = autofs4_get_inode(dir->i_sb, ino);
|
|
|
|
d_instantiate(dentry, inode);
|
|
|
|
|
|
|
|
if (dir == dir->i_sb->s_root->d_inode)
|
|
|
|
dentry->d_op = &autofs4_root_dentry_operations;
|
|
|
|
else
|
|
|
|
dentry->d_op = &autofs4_dentry_operations;
|
|
|
|
|
|
|
|
dentry->d_fsdata = ino;
|
|
|
|
ino->dentry = dget(dentry);
|
2006-03-27 02:14:46 -07:00
|
|
|
atomic_inc(&ino->count);
|
|
|
|
p_ino = autofs4_dentry_ino(dentry->d_parent);
|
|
|
|
if (p_ino && dentry->d_parent != dentry)
|
|
|
|
atomic_inc(&p_ino->count);
|
2005-04-16 16:20:36 -06:00
|
|
|
ino->inode = inode;
|
|
|
|
dir->i_nlink++;
|
|
|
|
dir->i_mtime = CURRENT_TIME;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Get/set timeout ioctl() operation */
|
|
|
|
static inline int autofs4_get_set_timeout(struct autofs_sb_info *sbi,
|
|
|
|
unsigned long __user *p)
|
|
|
|
{
|
|
|
|
int rv;
|
|
|
|
unsigned long ntimeout;
|
|
|
|
|
|
|
|
if ( (rv = get_user(ntimeout, p)) ||
|
|
|
|
(rv = put_user(sbi->exp_timeout/HZ, p)) )
|
|
|
|
return rv;
|
|
|
|
|
|
|
|
if ( ntimeout > ULONG_MAX/HZ )
|
|
|
|
sbi->exp_timeout = 0;
|
|
|
|
else
|
|
|
|
sbi->exp_timeout = ntimeout * HZ;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return protocol version */
|
|
|
|
static inline int autofs4_get_protover(struct autofs_sb_info *sbi, int __user *p)
|
|
|
|
{
|
|
|
|
return put_user(sbi->version, p);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Return protocol sub version */
|
|
|
|
static inline int autofs4_get_protosubver(struct autofs_sb_info *sbi, int __user *p)
|
|
|
|
{
|
|
|
|
return put_user(sbi->sub_version, p);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Tells the daemon whether we need to reghost or not. Also, clears
|
|
|
|
* the reghost_needed flag.
|
|
|
|
*/
|
|
|
|
static inline int autofs4_ask_reghost(struct autofs_sb_info *sbi, int __user *p)
|
|
|
|
{
|
|
|
|
int status;
|
|
|
|
|
|
|
|
DPRINTK("returning %d", sbi->needs_reghost);
|
|
|
|
|
|
|
|
status = put_user(sbi->needs_reghost, p);
|
|
|
|
if ( status )
|
|
|
|
return status;
|
|
|
|
|
|
|
|
sbi->needs_reghost = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Enable / Disable reghosting ioctl() operation
|
|
|
|
*/
|
|
|
|
static inline int autofs4_toggle_reghost(struct autofs_sb_info *sbi, int __user *p)
|
|
|
|
{
|
|
|
|
int status;
|
|
|
|
int val;
|
|
|
|
|
|
|
|
status = get_user(val, p);
|
|
|
|
|
|
|
|
DPRINTK("reghost = %d", val);
|
|
|
|
|
|
|
|
if (status)
|
|
|
|
return status;
|
|
|
|
|
|
|
|
/* turn on/off reghosting, with the val */
|
|
|
|
sbi->reghost_enabled = val;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Tells the daemon whether it can umount the autofs mount.
|
|
|
|
*/
|
|
|
|
static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
|
|
|
|
{
|
|
|
|
int status = 0;
|
|
|
|
|
2006-03-27 02:14:51 -07:00
|
|
|
if (may_umount(mnt))
|
2005-04-16 16:20:36 -06:00
|
|
|
status = 1;
|
|
|
|
|
|
|
|
DPRINTK("returning %d", status);
|
|
|
|
|
|
|
|
status = put_user(status, p);
|
|
|
|
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Identify autofs4_dentries - this is so we can tell if there's
|
|
|
|
an extra dentry refcount or not. We only hold a refcount on the
|
|
|
|
dentry if its non-negative (ie, d_inode != NULL)
|
|
|
|
*/
|
|
|
|
int is_autofs4_dentry(struct dentry *dentry)
|
|
|
|
{
|
|
|
|
return dentry && dentry->d_inode &&
|
|
|
|
(dentry->d_op == &autofs4_root_dentry_operations ||
|
|
|
|
dentry->d_op == &autofs4_dentry_operations) &&
|
|
|
|
dentry->d_fsdata != NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* ioctl()'s on the root directory is the chief method for the daemon to
|
|
|
|
* generate kernel reactions
|
|
|
|
*/
|
|
|
|
static int autofs4_root_ioctl(struct inode *inode, struct file *filp,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
|
|
|
|
void __user *p = (void __user *)arg;
|
|
|
|
|
|
|
|
DPRINTK("cmd = 0x%08x, arg = 0x%08lx, sbi = %p, pgrp = %u",
|
|
|
|
cmd,arg,sbi,process_group(current));
|
|
|
|
|
|
|
|
if ( _IOC_TYPE(cmd) != _IOC_TYPE(AUTOFS_IOC_FIRST) ||
|
|
|
|
_IOC_NR(cmd) - _IOC_NR(AUTOFS_IOC_FIRST) >= AUTOFS_IOC_COUNT )
|
|
|
|
return -ENOTTY;
|
|
|
|
|
|
|
|
if ( !autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN) )
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
switch(cmd) {
|
|
|
|
case AUTOFS_IOC_READY: /* Wait queue: go ahead and retry */
|
|
|
|
return autofs4_wait_release(sbi,(autofs_wqt_t)arg,0);
|
|
|
|
case AUTOFS_IOC_FAIL: /* Wait queue: fail with ENOENT */
|
|
|
|
return autofs4_wait_release(sbi,(autofs_wqt_t)arg,-ENOENT);
|
|
|
|
case AUTOFS_IOC_CATATONIC: /* Enter catatonic mode (daemon shutdown) */
|
|
|
|
autofs4_catatonic_mode(sbi);
|
|
|
|
return 0;
|
|
|
|
case AUTOFS_IOC_PROTOVER: /* Get protocol version */
|
|
|
|
return autofs4_get_protover(sbi, p);
|
|
|
|
case AUTOFS_IOC_PROTOSUBVER: /* Get protocol sub version */
|
|
|
|
return autofs4_get_protosubver(sbi, p);
|
|
|
|
case AUTOFS_IOC_SETTIMEOUT:
|
|
|
|
return autofs4_get_set_timeout(sbi, p);
|
|
|
|
|
|
|
|
case AUTOFS_IOC_TOGGLEREGHOST:
|
|
|
|
return autofs4_toggle_reghost(sbi, p);
|
|
|
|
case AUTOFS_IOC_ASKREGHOST:
|
|
|
|
return autofs4_ask_reghost(sbi, p);
|
|
|
|
|
|
|
|
case AUTOFS_IOC_ASKUMOUNT:
|
|
|
|
return autofs4_ask_umount(filp->f_vfsmnt, p);
|
|
|
|
|
|
|
|
/* return a single thing to expire */
|
|
|
|
case AUTOFS_IOC_EXPIRE:
|
|
|
|
return autofs4_expire_run(inode->i_sb,filp->f_vfsmnt,sbi, p);
|
|
|
|
/* same as above, but can send multiple expires through pipe */
|
|
|
|
case AUTOFS_IOC_EXPIRE_MULTI:
|
|
|
|
return autofs4_expire_multi(inode->i_sb,filp->f_vfsmnt,sbi, p);
|
|
|
|
|
|
|
|
default:
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
}
|