Skip to content
Snippets Groups Projects
Select Git revision
  • 0a4e6be9ca17c54817cf814b4b5aa60478c6df27
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

pvclock.h

Blame
  • inode.c 8.54 KiB
    /*
     * Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
     * Copyright 2005-2006 Ian Kent <raven@themaw.net>
     *
     * This file is part of the Linux kernel and is made available under
     * the terms of the GNU General Public License, version 2, or at your
     * option, any later version, incorporated herein by reference.
     */
    
    #include <linux/kernel.h>
    #include <linux/slab.h>
    #include <linux/file.h>
    #include <linux/seq_file.h>
    #include <linux/pagemap.h>
    #include <linux/parser.h>
    #include <linux/bitops.h>
    #include <linux/magic.h>
    #include "autofs_i.h"
    #include <linux/module.h>
    
    struct autofs_info *autofs4_new_ino(struct autofs_sb_info *sbi)
    {
    	struct autofs_info *ino;
    
    	ino = kzalloc(sizeof(*ino), GFP_KERNEL);
    	if (ino) {
    		INIT_LIST_HEAD(&ino->active);
    		INIT_LIST_HEAD(&ino->expiring);
    		ino->last_used = jiffies;
    		ino->sbi = sbi;
    	}
    	return ino;
    }
    
    void autofs4_clean_ino(struct autofs_info *ino)
    {
    	ino->uid = GLOBAL_ROOT_UID;
    	ino->gid = GLOBAL_ROOT_GID;
    	ino->last_used = jiffies;
    }
    
    void autofs4_free_ino(struct autofs_info *ino)
    {
    	kfree(ino);
    }
    
    void autofs4_kill_sb(struct super_block *sb)
    {
    	struct autofs_sb_info *sbi = autofs4_sbi(sb);
    
    	/*
    	 * In the event of a failure in get_sb_nodev the superblock
    	 * info is not present so nothing else has been setup, so
    	 * just call kill_anon_super when we are called from
    	 * deactivate_super.
    	 */
    	if (sbi) {
    		/* Free wait queues, close pipe */
    		autofs4_catatonic_mode(sbi);
    		put_pid(sbi->oz_pgrp);
    	}
    
    	DPRINTK("shutting down");
    	kill_litter_super(sb);
    	if (sbi)
    		kfree_rcu(sbi, rcu);
    }
    
    static int autofs4_show_options(struct seq_file *m, struct dentry *root)
    {
    	struct autofs_sb_info *sbi = autofs4_sbi(root->d_sb);
    	struct inode *root_inode = d_inode(root->d_sb->s_root);
    
    	if (!sbi)
    		return 0;
    
    	seq_printf(m, ",fd=%d", sbi->pipefd);
    	if (!uid_eq(root_inode->i_uid, GLOBAL_ROOT_UID))
    		seq_printf(m, ",uid=%u",
    			from_kuid_munged(&init_user_ns, root_inode->i_uid));
    	if (!gid_eq(root_inode->i_gid, GLOBAL_ROOT_GID))
    		seq_printf(m, ",gid=%u",
    			from_kgid_munged(&init_user_ns, root_inode->i_gid));
    	seq_printf(m, ",pgrp=%d", pid_vnr(sbi->oz_pgrp));
    	seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
    	seq_printf(m, ",minproto=%d", sbi->min_proto);
    	seq_printf(m, ",maxproto=%d", sbi->max_proto);
    
    	if (autofs_type_offset(sbi->type))
    		seq_printf(m, ",offset");
    	else if (autofs_type_direct(sbi->type))
    		seq_printf(m, ",direct");
    	else
    		seq_printf(m, ",indirect");
    #ifdef CONFIG_CHECKPOINT_RESTORE
    	if (sbi->pipe)
    		seq_printf(m, ",pipe_ino=%ld", sbi->pipe->f_inode->i_ino);
    	else
    		seq_printf(m, ",pipe_ino=-1");
    #endif
    	return 0;
    }
    
    static void autofs4_evict_inode(struct inode *inode)
    {
    	clear_inode(inode);
    	kfree(inode->i_private);
    }
    
    static const struct super_operations autofs4_sops = {
    	.statfs		= simple_statfs,
    	.show_options	= autofs4_show_options,
    	.evict_inode	= autofs4_evict_inode,
    };
    
    enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
    	Opt_indirect, Opt_direct, Opt_offset};
    
    static const match_table_t tokens = {
    	{Opt_fd, "fd=%u"},
    	{Opt_uid, "uid=%u"},
    	{Opt_gid, "gid=%u"},
    	{Opt_pgrp, "pgrp=%u"},
    	{Opt_minproto, "minproto=%u"},
    	{Opt_maxproto, "maxproto=%u"},
    	{Opt_indirect, "indirect"},
    	{Opt_direct, "direct"},
    	{Opt_offset, "offset"},
    	{Opt_err, NULL}
    };
    
    static int parse_options(char *options, int *pipefd, kuid_t *uid, kgid_t *gid,
    			 int *pgrp, bool *pgrp_set, unsigned int *type,
    			 int *minproto, int *maxproto)
    {
    	char *p;
    	substring_t args[MAX_OPT_ARGS];
    	int option;
    
    	*uid = current_uid();
    	*gid = current_gid();
    
    	*minproto = AUTOFS_MIN_PROTO_VERSION;
    	*maxproto = AUTOFS_MAX_PROTO_VERSION;
    
    	*pipefd = -1;
    
    	if (!options)
    		return 1;
    
    	while ((p = strsep(&options, ",")) != NULL) {
    		int token;
    
    		if (!*p)
    			continue;
    
    		token = match_token(p, tokens, args);
    		switch (token) {
    		case Opt_fd:
    			if (match_int(args, pipefd))
    				return 1;
    			break;
    		case Opt_uid:
    			if (match_int(args, &option))
    				return 1;
    			*uid = make_kuid(current_user_ns(), option);
    			if (!uid_valid(*uid))
    				return 1;
    			break;
    		case Opt_gid:
    			if (match_int(args, &option))
    				return 1;
    			*gid = make_kgid(current_user_ns(), option);
    			if (!gid_valid(*gid))
    				return 1;
    			break;
    		case Opt_pgrp:
    			if (match_int(args, &option))
    				return 1;
    			*pgrp = option;
    			*pgrp_set = true;
    			break;
    		case Opt_minproto:
    			if (match_int(args, &option))
    				return 1;
    			*minproto = option;
    			break;
    		case Opt_maxproto:
    			if (match_int(args, &option))
    				return 1;
    			*maxproto = option;
    			break;
    		case Opt_indirect:
    			set_autofs_type_indirect(type);
    			break;
    		case Opt_direct:
    			set_autofs_type_direct(type);
    			break;
    		case Opt_offset:
    			set_autofs_type_offset(type);
    			break;
    		default:
    			return 1;
    		}
    	}
    	return (*pipefd < 0);
    }
    
    int autofs4_fill_super(struct super_block *s, void *data, int silent)
    {
    	struct inode *root_inode;
    	struct dentry *root;
    	struct file *pipe;
    	int pipefd;
    	struct autofs_sb_info *sbi;
    	struct autofs_info *ino;
    	int pgrp = 0;
    	bool pgrp_set = false;
    	int ret = -EINVAL;
    
    	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
    	if (!sbi)
    		return -ENOMEM;
    	DPRINTK("starting up, sbi = %p", sbi);
    
    	s->s_fs_info = sbi;
    	sbi->magic = AUTOFS_SBI_MAGIC;
    	sbi->pipefd = -1;
    	sbi->pipe = NULL;
    	sbi->catatonic = 1;
    	sbi->exp_timeout = 0;
    	sbi->oz_pgrp = NULL;
    	sbi->sb = s;
    	sbi->version = 0;
    	sbi->sub_version = 0;
    	set_autofs_type_indirect(&sbi->type);
    	sbi->min_proto = 0;
    	sbi->max_proto = 0;
    	mutex_init(&sbi->wq_mutex);
    	mutex_init(&sbi->pipe_mutex);
    	spin_lock_init(&sbi->fs_lock);
    	sbi->queues = NULL;
    	spin_lock_init(&sbi->lookup_lock);
    	INIT_LIST_HEAD(&sbi->active_list);
    	INIT_LIST_HEAD(&sbi->expiring_list);
    	s->s_blocksize = 1024;
    	s->s_blocksize_bits = 10;
    	s->s_magic = AUTOFS_SUPER_MAGIC;
    	s->s_op = &autofs4_sops;
    	s->s_d_op = &autofs4_dentry_operations;
    	s->s_time_gran = 1;
    
    	/*
    	 * Get the root inode and dentry, but defer checking for errors.
    	 */
    	ino = autofs4_new_ino(sbi);
    	if (!ino) {
    		ret = -ENOMEM;
    		goto fail_free;
    	}
    	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
    	root = d_make_root(root_inode);
    	if (!root)
    		goto fail_ino;
    	pipe = NULL;
    
    	root->d_fsdata = ino;
    
    	/* Can this call block? */
    	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
    			  &pgrp, &pgrp_set, &sbi->type, &sbi->min_proto,
    			  &sbi->max_proto)) {
    		printk("autofs: called with bogus options\n");
    		goto fail_dput;
    	}
    
    	if (pgrp_set) {
    		sbi->oz_pgrp = find_get_pid(pgrp);
    		if (!sbi->oz_pgrp) {
    			pr_warn("autofs: could not find process group %d\n",
    				pgrp);
    			goto fail_dput;
    		}
    	} else {
    		sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
    	}
    
    	if (autofs_type_trigger(sbi->type))
    		__managed_dentry_set_managed(root);
    
    	root_inode->i_fop = &autofs4_root_operations;
    	root_inode->i_op = &autofs4_dir_inode_operations;
    
    	/* Couldn't this be tested earlier? */
    	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
    	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
    		printk("autofs: kernel does not match daemon version "
    		       "daemon (%d, %d) kernel (%d, %d)\n",
    			sbi->min_proto, sbi->max_proto,
    			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
    		goto fail_dput;
    	}
    
    	/* Establish highest kernel protocol version */
    	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
    		sbi->version = AUTOFS_MAX_PROTO_VERSION;
    	else
    		sbi->version = sbi->max_proto;
    	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
    
    	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, pid_nr(sbi->oz_pgrp));
    	pipe = fget(pipefd);
    
    	if (!pipe) {
    		printk("autofs: could not open pipe file descriptor\n");
    		goto fail_dput;
    	}
    	ret = autofs_prepare_pipe(pipe);
    	if (ret < 0)
    		goto fail_fput;
    	sbi->pipe = pipe;
    	sbi->pipefd = pipefd;
    	sbi->catatonic = 0;
    
    	/*
    	 * Success! Install the root dentry now to indicate completion.
    	 */
    	s->s_root = root;
    	return 0;
    
    	/*
    	 * Failure ... clean up.
    	 */
    fail_fput:
    	printk("autofs: pipe file descriptor does not contain proper ops\n");
    	fput(pipe);
    	/* fall through */
    fail_dput:
    	dput(root);
    	goto fail_free;
    fail_ino:
    	kfree(ino);
    fail_free:
    	put_pid(sbi->oz_pgrp);
    	kfree(sbi);
    	s->s_fs_info = NULL;
    	return ret;
    }
    
    struct inode *autofs4_get_inode(struct super_block *sb, umode_t mode)
    {
    	struct inode *inode = new_inode(sb);
    
    	if (inode == NULL)
    		return NULL;
    
    	inode->i_mode = mode;
    	if (sb->s_root) {
    		inode->i_uid = d_inode(sb->s_root)->i_uid;
    		inode->i_gid = d_inode(sb->s_root)->i_gid;
    	}
    	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
    	inode->i_ino = get_next_ino();
    
    	if (S_ISDIR(mode)) {
    		set_nlink(inode, 2);
    		inode->i_op = &autofs4_dir_inode_operations;
    		inode->i_fop = &autofs4_dir_operations;
    	} else if (S_ISLNK(mode)) {
    		inode->i_op = &autofs4_symlink_inode_operations;
    	}
    
    	return inode;
    }