inode.c 28.2 KB
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/*
  FUSE: Filesystem in Userspace
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  Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>
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  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

#include "fuse_i.h"

#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/parser.h>
#include <linux/statfs.h>
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#include <linux/random.h>
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#include <linux/sched.h>
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#include <linux/exportfs.h>
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MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
MODULE_LICENSE("GPL");

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static struct kmem_cache *fuse_inode_cachep;
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struct list_head fuse_conn_list;
DEFINE_MUTEX(fuse_mutex);
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static int set_global_limit(const char *val, struct kernel_param *kp);

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unsigned max_user_bgreq;
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module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
		  &max_user_bgreq, 0644);
__MODULE_PARM_TYPE(max_user_bgreq, "uint");
MODULE_PARM_DESC(max_user_bgreq,
 "Global limit for the maximum number of backgrounded requests an "
 "unprivileged user can set");

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unsigned max_user_congthresh;
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module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
		  &max_user_congthresh, 0644);
__MODULE_PARM_TYPE(max_user_congthresh, "uint");
MODULE_PARM_DESC(max_user_congthresh,
 "Global limit for the maximum congestion threshold an "
 "unprivileged user can set");

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#define FUSE_SUPER_MAGIC 0x65735546

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#define FUSE_DEFAULT_BLKSIZE 512

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/** Maximum number of outstanding background requests */
#define FUSE_DEFAULT_MAX_BACKGROUND 12

/** Congestion starts at 75% of maximum */
#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)

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struct fuse_mount_data {
	int fd;
	unsigned rootmode;
	unsigned user_id;
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	unsigned group_id;
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	unsigned fd_present:1;
	unsigned rootmode_present:1;
	unsigned user_id_present:1;
	unsigned group_id_present:1;
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	unsigned flags;
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	unsigned max_read;
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	unsigned blksize;
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};

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struct fuse_forget_link *fuse_alloc_forget(void)
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{
	return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
}

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static struct inode *fuse_alloc_inode(struct super_block *sb)
{
	struct inode *inode;
	struct fuse_inode *fi;

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	inode = kmem_cache_alloc(fuse_inode_cachep, GFP_KERNEL);
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	if (!inode)
		return NULL;

	fi = get_fuse_inode(inode);
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	fi->i_time = 0;
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	fi->nodeid = 0;
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	fi->nlookup = 0;
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	fi->attr_version = 0;
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	fi->writectr = 0;
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	INIT_LIST_HEAD(&fi->write_files);
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	INIT_LIST_HEAD(&fi->queued_writes);
	INIT_LIST_HEAD(&fi->writepages);
	init_waitqueue_head(&fi->page_waitq);
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	fi->forget = fuse_alloc_forget();
	if (!fi->forget) {
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		kmem_cache_free(fuse_inode_cachep, inode);
		return NULL;
	}
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	return inode;
}

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static void fuse_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(fuse_inode_cachep, inode);
}

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static void fuse_destroy_inode(struct inode *inode)
{
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	struct fuse_inode *fi = get_fuse_inode(inode);
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	BUG_ON(!list_empty(&fi->write_files));
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	BUG_ON(!list_empty(&fi->queued_writes));
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	kfree(fi->forget);
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	call_rcu(&inode->i_rcu, fuse_i_callback);
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}

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static void fuse_evict_inode(struct inode *inode)
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{
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	truncate_inode_pages(&inode->i_data, 0);
	end_writeback(inode);
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	if (inode->i_sb->s_flags & MS_ACTIVE) {
		struct fuse_conn *fc = get_fuse_conn(inode);
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		struct fuse_inode *fi = get_fuse_inode(inode);
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		fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);
		fi->forget = NULL;
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	}
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}

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static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
{
	if (*flags & MS_MANDLOCK)
		return -EINVAL;

	return 0;
}

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void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
				   u64 attr_valid)
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{
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	struct fuse_conn *fc = get_fuse_conn(inode);
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	struct fuse_inode *fi = get_fuse_inode(inode);
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	fi->attr_version = ++fc->attr_version;
	fi->i_time = attr_valid;

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	inode->i_ino     = attr->ino;
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	inode->i_mode    = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
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	set_nlink(inode, attr->nlink);
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	inode->i_uid     = attr->uid;
	inode->i_gid     = attr->gid;
	inode->i_blocks  = attr->blocks;
	inode->i_atime.tv_sec   = attr->atime;
	inode->i_atime.tv_nsec  = attr->atimensec;
	inode->i_mtime.tv_sec   = attr->mtime;
	inode->i_mtime.tv_nsec  = attr->mtimensec;
	inode->i_ctime.tv_sec   = attr->ctime;
	inode->i_ctime.tv_nsec  = attr->ctimensec;
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	if (attr->blksize != 0)
		inode->i_blkbits = ilog2(attr->blksize);
	else
		inode->i_blkbits = inode->i_sb->s_blocksize_bits;

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	/*
	 * Don't set the sticky bit in i_mode, unless we want the VFS
	 * to check permissions.  This prevents failures due to the
	 * check in may_delete().
	 */
	fi->orig_i_mode = inode->i_mode;
	if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
		inode->i_mode &= ~S_ISVTX;
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}

void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
			    u64 attr_valid, u64 attr_version)
{
	struct fuse_conn *fc = get_fuse_conn(inode);
	struct fuse_inode *fi = get_fuse_inode(inode);
	loff_t oldsize;

	spin_lock(&fc->lock);
	if (attr_version != 0 && fi->attr_version > attr_version) {
		spin_unlock(&fc->lock);
		return;
	}

	fuse_change_attributes_common(inode, attr, attr_valid);
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	oldsize = inode->i_size;
	i_size_write(inode, attr->size);
	spin_unlock(&fc->lock);

	if (S_ISREG(inode->i_mode) && oldsize != attr->size) {
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		truncate_pagecache(inode, oldsize, attr->size);
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		invalidate_inode_pages2(inode->i_mapping);
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	}
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}

static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
{
	inode->i_mode = attr->mode & S_IFMT;
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	inode->i_size = attr->size;
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	if (S_ISREG(inode->i_mode)) {
		fuse_init_common(inode);
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		fuse_init_file_inode(inode);
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	} else if (S_ISDIR(inode->i_mode))
		fuse_init_dir(inode);
	else if (S_ISLNK(inode->i_mode))
		fuse_init_symlink(inode);
	else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode) ||
		 S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
		fuse_init_common(inode);
		init_special_inode(inode, inode->i_mode,
				   new_decode_dev(attr->rdev));
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	} else
		BUG();
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}

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int fuse_inode_eq(struct inode *inode, void *_nodeidp)
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{
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	u64 nodeid = *(u64 *) _nodeidp;
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	if (get_node_id(inode) == nodeid)
		return 1;
	else
		return 0;
}

static int fuse_inode_set(struct inode *inode, void *_nodeidp)
{
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	u64 nodeid = *(u64 *) _nodeidp;
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	get_fuse_inode(inode)->nodeid = nodeid;
	return 0;
}

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struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
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			int generation, struct fuse_attr *attr,
			u64 attr_valid, u64 attr_version)
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{
	struct inode *inode;
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	struct fuse_inode *fi;
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	struct fuse_conn *fc = get_fuse_conn_super(sb);

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	inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
	if (!inode)
		return NULL;

	if ((inode->i_state & I_NEW)) {
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		inode->i_flags |= S_NOATIME|S_NOCMTIME;
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		inode->i_generation = generation;
		inode->i_data.backing_dev_info = &fc->bdi;
		fuse_init_inode(inode, attr);
		unlock_new_inode(inode);
	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
		/* Inode has changed type, any I/O on the old should fail */
		make_bad_inode(inode);
		iput(inode);
		goto retry;
	}

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	fi = get_fuse_inode(inode);
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	spin_lock(&fc->lock);
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	fi->nlookup++;
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	spin_unlock(&fc->lock);
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	fuse_change_attributes(inode, attr, attr_valid, attr_version);

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	return inode;
}

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int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
			     loff_t offset, loff_t len)
{
	struct inode *inode;
	pgoff_t pg_start;
	pgoff_t pg_end;

	inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
	if (!inode)
		return -ENOENT;

	fuse_invalidate_attr(inode);
	if (offset >= 0) {
		pg_start = offset >> PAGE_CACHE_SHIFT;
		if (len <= 0)
			pg_end = -1;
		else
			pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
		invalidate_inode_pages2_range(inode->i_mapping,
					      pg_start, pg_end);
	}
	iput(inode);
	return 0;
}

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static void fuse_umount_begin(struct super_block *sb)
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{
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	fuse_abort_conn(get_fuse_conn_super(sb));
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}

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static void fuse_send_destroy(struct fuse_conn *fc)
{
	struct fuse_req *req = fc->destroy_req;
	if (req && fc->conn_init) {
		fc->destroy_req = NULL;
		req->in.h.opcode = FUSE_DESTROY;
		req->force = 1;
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		fuse_request_send(fc, req);
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		fuse_put_request(fc, req);
	}
}

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static void fuse_bdi_destroy(struct fuse_conn *fc)
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{
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	if (fc->bdi_initialized)
		bdi_destroy(&fc->bdi);
}
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void fuse_conn_kill(struct fuse_conn *fc)
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{
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	spin_lock(&fc->lock);
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	fc->connected = 0;
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	fc->blocked = 0;
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	spin_unlock(&fc->lock);
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	/* Flush all readers on this fs */
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	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
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	wake_up_all(&fc->waitq);
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	wake_up_all(&fc->blocked_waitq);
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	wake_up_all(&fc->reserved_req_waitq);
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	mutex_lock(&fuse_mutex);
	list_del(&fc->entry);
	fuse_ctl_remove_conn(fc);
	mutex_unlock(&fuse_mutex);
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	fuse_bdi_destroy(fc);
}
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EXPORT_SYMBOL_GPL(fuse_conn_kill);
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static void fuse_put_super(struct super_block *sb)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);

	fuse_send_destroy(fc);
	fuse_conn_kill(fc);
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	fuse_conn_put(fc);
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}

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static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
{
	stbuf->f_type    = FUSE_SUPER_MAGIC;
	stbuf->f_bsize   = attr->bsize;
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	stbuf->f_frsize  = attr->frsize;
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	stbuf->f_blocks  = attr->blocks;
	stbuf->f_bfree   = attr->bfree;
	stbuf->f_bavail  = attr->bavail;
	stbuf->f_files   = attr->files;
	stbuf->f_ffree   = attr->ffree;
	stbuf->f_namelen = attr->namelen;
	/* fsid is left zero */
}

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static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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	struct super_block *sb = dentry->d_sb;
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	struct fuse_conn *fc = get_fuse_conn_super(sb);
	struct fuse_req *req;
	struct fuse_statfs_out outarg;
	int err;

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	if (!fuse_allow_task(fc, current)) {
		buf->f_type = FUSE_SUPER_MAGIC;
		return 0;
	}

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	req = fuse_get_req(fc);
	if (IS_ERR(req))
		return PTR_ERR(req);
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	memset(&outarg, 0, sizeof(outarg));
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	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
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	req->in.h.nodeid = get_node_id(dentry->d_inode);
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	req->out.numargs = 1;
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	req->out.args[0].size =
		fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
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	req->out.args[0].value = &outarg;
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	fuse_request_send(fc, req);
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	err = req->out.h.error;
	if (!err)
		convert_fuse_statfs(buf, &outarg.st);
	fuse_put_request(fc, req);
	return err;
}

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enum {
	OPT_FD,
	OPT_ROOTMODE,
	OPT_USER_ID,
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	OPT_GROUP_ID,
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	OPT_DEFAULT_PERMISSIONS,
	OPT_ALLOW_OTHER,
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	OPT_MAX_READ,
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	OPT_BLKSIZE,
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	OPT_ERR
};

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static const match_table_t tokens = {
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	{OPT_FD,			"fd=%u"},
	{OPT_ROOTMODE,			"rootmode=%o"},
	{OPT_USER_ID,			"user_id=%u"},
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	{OPT_GROUP_ID,			"group_id=%u"},
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	{OPT_DEFAULT_PERMISSIONS,	"default_permissions"},
	{OPT_ALLOW_OTHER,		"allow_other"},
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	{OPT_MAX_READ,			"max_read=%u"},
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	{OPT_BLKSIZE,			"blksize=%u"},
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	{OPT_ERR,			NULL}
};

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static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
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{
	char *p;
	memset(d, 0, sizeof(struct fuse_mount_data));
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	d->max_read = ~0;
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	d->blksize = FUSE_DEFAULT_BLKSIZE;
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	while ((p = strsep(&opt, ",")) != NULL) {
		int token;
		int value;
		substring_t args[MAX_OPT_ARGS];
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case OPT_FD:
			if (match_int(&args[0], &value))
				return 0;
			d->fd = value;
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			d->fd_present = 1;
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			break;

		case OPT_ROOTMODE:
			if (match_octal(&args[0], &value))
				return 0;
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			if (!fuse_valid_type(value))
				return 0;
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			d->rootmode = value;
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			d->rootmode_present = 1;
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			break;

		case OPT_USER_ID:
			if (match_int(&args[0], &value))
				return 0;
			d->user_id = value;
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			d->user_id_present = 1;
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			break;

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		case OPT_GROUP_ID:
			if (match_int(&args[0], &value))
				return 0;
			d->group_id = value;
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			d->group_id_present = 1;
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			break;

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		case OPT_DEFAULT_PERMISSIONS:
			d->flags |= FUSE_DEFAULT_PERMISSIONS;
			break;

		case OPT_ALLOW_OTHER:
			d->flags |= FUSE_ALLOW_OTHER;
			break;

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		case OPT_MAX_READ:
			if (match_int(&args[0], &value))
				return 0;
			d->max_read = value;
			break;

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		case OPT_BLKSIZE:
			if (!is_bdev || match_int(&args[0], &value))
				return 0;
			d->blksize = value;
			break;

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		default:
			return 0;
		}
	}
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	if (!d->fd_present || !d->rootmode_present ||
	    !d->user_id_present || !d->group_id_present)
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		return 0;

	return 1;
}

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static int fuse_show_options(struct seq_file *m, struct dentry *root)
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{
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	struct super_block *sb = root->d_sb;
	struct fuse_conn *fc = get_fuse_conn_super(sb);
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	seq_printf(m, ",user_id=%u", fc->user_id);
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	seq_printf(m, ",group_id=%u", fc->group_id);
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	if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
		seq_puts(m, ",default_permissions");
	if (fc->flags & FUSE_ALLOW_OTHER)
		seq_puts(m, ",allow_other");
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	if (fc->max_read != ~0)
		seq_printf(m, ",max_read=%u", fc->max_read);
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	if (sb->s_bdev && sb->s_blocksize != FUSE_DEFAULT_BLKSIZE)
		seq_printf(m, ",blksize=%lu", sb->s_blocksize);
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	return 0;
}

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void fuse_conn_init(struct fuse_conn *fc)
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{
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	memset(fc, 0, sizeof(*fc));
	spin_lock_init(&fc->lock);
	mutex_init(&fc->inst_mutex);
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	init_rwsem(&fc->killsb);
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	atomic_set(&fc->count, 1);
	init_waitqueue_head(&fc->waitq);
	init_waitqueue_head(&fc->blocked_waitq);
	init_waitqueue_head(&fc->reserved_req_waitq);
	INIT_LIST_HEAD(&fc->pending);
	INIT_LIST_HEAD(&fc->processing);
	INIT_LIST_HEAD(&fc->io);
	INIT_LIST_HEAD(&fc->interrupts);
	INIT_LIST_HEAD(&fc->bg_queue);
	INIT_LIST_HEAD(&fc->entry);
534
	fc->forget_list_tail = &fc->forget_list_head;
535
	atomic_set(&fc->num_waiting, 0);
536 537
	fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;
	fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;
538 539 540 541 542 543
	fc->khctr = 0;
	fc->polled_files = RB_ROOT;
	fc->reqctr = 0;
	fc->blocked = 1;
	fc->attr_version = 1;
	get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
M
Miklos Szeredi 已提交
544
}
545
EXPORT_SYMBOL_GPL(fuse_conn_init);
M
Miklos Szeredi 已提交
546

547 548
void fuse_conn_put(struct fuse_conn *fc)
{
549
	if (atomic_dec_and_test(&fc->count)) {
550 551
		if (fc->destroy_req)
			fuse_request_free(fc->destroy_req);
552
		mutex_destroy(&fc->inst_mutex);
T
Tejun Heo 已提交
553
		fc->release(fc);
554
	}
555
}
556
EXPORT_SYMBOL_GPL(fuse_conn_put);
557 558 559 560 561 562

struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
{
	atomic_inc(&fc->count);
	return fc;
}
563
EXPORT_SYMBOL_GPL(fuse_conn_get);
564

565
static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
M
Miklos Szeredi 已提交
566 567 568 569 570 571
{
	struct fuse_attr attr;
	memset(&attr, 0, sizeof(attr));

	attr.mode = mode;
	attr.ino = FUSE_ROOT_ID;
572
	attr.nlink = 1;
573
	return fuse_iget(sb, 1, 0, &attr, 0, 0);
M
Miklos Szeredi 已提交
574 575
}

M
Miklos Szeredi 已提交
576
struct fuse_inode_handle {
M
Miklos Szeredi 已提交
577 578 579 580 581 582 583
	u64 nodeid;
	u32 generation;
};

static struct dentry *fuse_get_dentry(struct super_block *sb,
				      struct fuse_inode_handle *handle)
{
584
	struct fuse_conn *fc = get_fuse_conn_super(sb);
M
Miklos Szeredi 已提交
585 586 587 588 589 590 591 592
	struct inode *inode;
	struct dentry *entry;
	int err = -ESTALE;

	if (handle->nodeid == 0)
		goto out_err;

	inode = ilookup5(sb, handle->nodeid, fuse_inode_eq, &handle->nodeid);
593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
	if (!inode) {
		struct fuse_entry_out outarg;
		struct qstr name;

		if (!fc->export_support)
			goto out_err;

		name.len = 1;
		name.name = ".";
		err = fuse_lookup_name(sb, handle->nodeid, &name, &outarg,
				       &inode);
		if (err && err != -ENOENT)
			goto out_err;
		if (err || !inode) {
			err = -ESTALE;
			goto out_err;
		}
		err = -EIO;
		if (get_node_id(inode) != handle->nodeid)
			goto out_iput;
	}
M
Miklos Szeredi 已提交
614 615 616 617
	err = -ESTALE;
	if (inode->i_generation != handle->generation)
		goto out_iput;

618
	entry = d_obtain_alias(inode);
A
Al Viro 已提交
619
	if (!IS_ERR(entry) && get_node_id(inode) != FUSE_ROOT_ID)
M
Miklos Szeredi 已提交
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
		fuse_invalidate_entry_cache(entry);

	return entry;

 out_iput:
	iput(inode);
 out_err:
	return ERR_PTR(err);
}

static int fuse_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
			   int connectable)
{
	struct inode *inode = dentry->d_inode;
	bool encode_parent = connectable && !S_ISDIR(inode->i_mode);
	int len = encode_parent ? 6 : 3;
	u64 nodeid;
	u32 generation;

639 640
	if (*max_len < len) {
		*max_len = len;
M
Miklos Szeredi 已提交
641
		return  255;
642
	}
M
Miklos Szeredi 已提交
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696

	nodeid = get_fuse_inode(inode)->nodeid;
	generation = inode->i_generation;

	fh[0] = (u32)(nodeid >> 32);
	fh[1] = (u32)(nodeid & 0xffffffff);
	fh[2] = generation;

	if (encode_parent) {
		struct inode *parent;

		spin_lock(&dentry->d_lock);
		parent = dentry->d_parent->d_inode;
		nodeid = get_fuse_inode(parent)->nodeid;
		generation = parent->i_generation;
		spin_unlock(&dentry->d_lock);

		fh[3] = (u32)(nodeid >> 32);
		fh[4] = (u32)(nodeid & 0xffffffff);
		fh[5] = generation;
	}

	*max_len = len;
	return encode_parent ? 0x82 : 0x81;
}

static struct dentry *fuse_fh_to_dentry(struct super_block *sb,
		struct fid *fid, int fh_len, int fh_type)
{
	struct fuse_inode_handle handle;

	if ((fh_type != 0x81 && fh_type != 0x82) || fh_len < 3)
		return NULL;

	handle.nodeid = (u64) fid->raw[0] << 32;
	handle.nodeid |= (u64) fid->raw[1];
	handle.generation = fid->raw[2];
	return fuse_get_dentry(sb, &handle);
}

static struct dentry *fuse_fh_to_parent(struct super_block *sb,
		struct fid *fid, int fh_len, int fh_type)
{
	struct fuse_inode_handle parent;

	if (fh_type != 0x82 || fh_len < 6)
		return NULL;

	parent.nodeid = (u64) fid->raw[3] << 32;
	parent.nodeid |= (u64) fid->raw[4];
	parent.generation = fid->raw[5];
	return fuse_get_dentry(sb, &parent);
}

697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
static struct dentry *fuse_get_parent(struct dentry *child)
{
	struct inode *child_inode = child->d_inode;
	struct fuse_conn *fc = get_fuse_conn(child_inode);
	struct inode *inode;
	struct dentry *parent;
	struct fuse_entry_out outarg;
	struct qstr name;
	int err;

	if (!fc->export_support)
		return ERR_PTR(-ESTALE);

	name.len = 2;
	name.name = "..";
	err = fuse_lookup_name(child_inode->i_sb, get_node_id(child_inode),
			       &name, &outarg, &inode);
714 715 716
	if (err) {
		if (err == -ENOENT)
			return ERR_PTR(-ESTALE);
717 718
		return ERR_PTR(err);
	}
719 720

	parent = d_obtain_alias(inode);
A
Al Viro 已提交
721
	if (!IS_ERR(parent) && get_node_id(inode) != FUSE_ROOT_ID)
722 723 724 725
		fuse_invalidate_entry_cache(parent);

	return parent;
}
M
Miklos Szeredi 已提交
726 727 728 729 730

static const struct export_operations fuse_export_operations = {
	.fh_to_dentry	= fuse_fh_to_dentry,
	.fh_to_parent	= fuse_fh_to_parent,
	.encode_fh	= fuse_encode_fh,
731
	.get_parent	= fuse_get_parent,
M
Miklos Szeredi 已提交
732 733
};

734
static const struct super_operations fuse_super_operations = {
M
Miklos Szeredi 已提交
735 736
	.alloc_inode    = fuse_alloc_inode,
	.destroy_inode  = fuse_destroy_inode,
737
	.evict_inode	= fuse_evict_inode,
M
Miklos Szeredi 已提交
738
	.drop_inode	= generic_delete_inode,
739
	.remount_fs	= fuse_remount_fs,
M
Miklos Szeredi 已提交
740
	.put_super	= fuse_put_super,
741
	.umount_begin	= fuse_umount_begin,
742
	.statfs		= fuse_statfs,
M
Miklos Szeredi 已提交
743 744 745
	.show_options	= fuse_show_options,
};

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
static void sanitize_global_limit(unsigned *limit)
{
	if (*limit == 0)
		*limit = ((num_physpages << PAGE_SHIFT) >> 13) /
			 sizeof(struct fuse_req);

	if (*limit >= 1 << 16)
		*limit = (1 << 16) - 1;
}

static int set_global_limit(const char *val, struct kernel_param *kp)
{
	int rv;

	rv = param_set_uint(val, kp);
	if (rv)
		return rv;

	sanitize_global_limit((unsigned *)kp->arg);

	return 0;
}

static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
{
	int cap_sys_admin = capable(CAP_SYS_ADMIN);

	if (arg->minor < 13)
		return;

	sanitize_global_limit(&max_user_bgreq);
	sanitize_global_limit(&max_user_congthresh);

	if (arg->max_background) {
		fc->max_background = arg->max_background;

		if (!cap_sys_admin && fc->max_background > max_user_bgreq)
			fc->max_background = max_user_bgreq;
	}
	if (arg->congestion_threshold) {
		fc->congestion_threshold = arg->congestion_threshold;

		if (!cap_sys_admin &&
		    fc->congestion_threshold > max_user_congthresh)
			fc->congestion_threshold = max_user_congthresh;
	}
}

794 795 796 797 798 799 800
static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
	struct fuse_init_out *arg = &req->misc.init_out;

	if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
		fc->conn_error = 1;
	else {
801 802
		unsigned long ra_pages;

803 804
		process_init_limits(fc, arg);

805 806 807 808
		if (arg->minor >= 6) {
			ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
			if (arg->flags & FUSE_ASYNC_READ)
				fc->async_read = 1;
809 810
			if (!(arg->flags & FUSE_POSIX_LOCKS))
				fc->no_lock = 1;
M
Miklos Szeredi 已提交
811 812 813
			if (arg->minor >= 17) {
				if (!(arg->flags & FUSE_FLOCK_LOCKS))
					fc->no_flock = 1;
M
Miklos Szeredi 已提交
814 815 816
			} else {
				if (!(arg->flags & FUSE_POSIX_LOCKS))
					fc->no_flock = 1;
M
Miklos Szeredi 已提交
817
			}
818 819
			if (arg->flags & FUSE_ATOMIC_O_TRUNC)
				fc->atomic_o_trunc = 1;
820 821 822 823 824
			if (arg->minor >= 9) {
				/* LOOKUP has dependency on proto version */
				if (arg->flags & FUSE_EXPORT_SUPPORT)
					fc->export_support = 1;
			}
825 826
			if (arg->flags & FUSE_BIG_WRITES)
				fc->big_writes = 1;
827 828
			if (arg->flags & FUSE_DONT_MASK)
				fc->dont_mask = 1;
829
		} else {
830
			ra_pages = fc->max_read / PAGE_CACHE_SIZE;
831
			fc->no_lock = 1;
M
Miklos Szeredi 已提交
832
			fc->no_flock = 1;
833
		}
834 835

		fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
836 837
		fc->minor = arg->minor;
		fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;
838
		fc->max_write = max_t(unsigned, 4096, fc->max_write);
839
		fc->conn_init = 1;
840
	}
841 842
	fc->blocked = 0;
	wake_up_all(&fc->blocked_waitq);
843 844
}

845
static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
846 847
{
	struct fuse_init_in *arg = &req->misc.init_in;
M
Miklos Szeredi 已提交
848

849 850
	arg->major = FUSE_KERNEL_VERSION;
	arg->minor = FUSE_KERNEL_MINOR_VERSION;
851
	arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
852
	arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
M
Miklos Szeredi 已提交
853 854
		FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
		FUSE_FLOCK_LOCKS;
855 856 857 858 859
	req->in.h.opcode = FUSE_INIT;
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(*arg);
	req->in.args[0].value = arg;
	req->out.numargs = 1;
D
Daniel Mack 已提交
860
	/* Variable length argument used for backward compatibility
861 862 863 864 865 866
	   with interface version < 7.5.  Rest of init_out is zeroed
	   by do_get_request(), so a short reply is not a problem */
	req->out.argvar = 1;
	req->out.args[0].size = sizeof(struct fuse_init_out);
	req->out.args[0].value = &req->misc.init_out;
	req->end = process_init_reply;
867
	fuse_request_send_background(fc, req);
868 869
}

T
Tejun Heo 已提交
870 871 872 873 874
static void fuse_free_conn(struct fuse_conn *fc)
{
	kfree(fc);
}

875 876 877 878
static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
{
	int err;

879
	fc->bdi.name = "fuse";
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
	fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
	/* fuse does it's own writeback accounting */
	fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;

	err = bdi_init(&fc->bdi);
	if (err)
		return err;

	fc->bdi_initialized = 1;

	if (sb->s_bdev) {
		err =  bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk",
				    MAJOR(fc->dev), MINOR(fc->dev));
	} else {
		err = bdi_register_dev(&fc->bdi, fc->dev);
	}

	if (err)
		return err;

	/*
	 * For a single fuse filesystem use max 1% of dirty +
	 * writeback threshold.
	 *
	 * This gives about 1M of write buffer for memory maps on a
	 * machine with 1G and 10% dirty_ratio, which should be more
	 * than enough.
	 *
	 * Privileged users can raise it by writing to
	 *
	 *    /sys/class/bdi/<bdi>/max_ratio
	 */
	bdi_set_max_ratio(&fc->bdi, 1);

	return 0;
}

M
Miklos Szeredi 已提交
917 918 919 920 921 922
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
{
	struct fuse_conn *fc;
	struct inode *root;
	struct fuse_mount_data d;
	struct file *file;
923
	struct dentry *root_dentry;
924
	struct fuse_req *init_req;
M
Miklos Szeredi 已提交
925
	int err;
M
Miklos Szeredi 已提交
926
	int is_bdev = sb->s_bdev != NULL;
M
Miklos Szeredi 已提交
927

928
	err = -EINVAL;
929
	if (sb->s_flags & MS_MANDLOCK)
930
		goto err;
931

A
Al Viro 已提交
932 933
	sb->s_flags &= ~MS_NOSEC;

M
Miklos Szeredi 已提交
934
	if (!parse_fuse_opt((char *) data, &d, is_bdev))
935
		goto err;
M
Miklos Szeredi 已提交
936

M
Miklos Szeredi 已提交
937
	if (is_bdev) {
938
#ifdef CONFIG_BLOCK
939
		err = -EINVAL;
M
Miklos Szeredi 已提交
940
		if (!sb_set_blocksize(sb, d.blksize))
941
			goto err;
942
#endif
M
Miklos Szeredi 已提交
943 944 945 946
	} else {
		sb->s_blocksize = PAGE_CACHE_SIZE;
		sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	}
M
Miklos Szeredi 已提交
947 948 949
	sb->s_magic = FUSE_SUPER_MAGIC;
	sb->s_op = &fuse_super_operations;
	sb->s_maxbytes = MAX_LFS_FILESIZE;
M
Miklos Szeredi 已提交
950
	sb->s_export_op = &fuse_export_operations;
M
Miklos Szeredi 已提交
951 952

	file = fget(d.fd);
953
	err = -EINVAL;
M
Miklos Szeredi 已提交
954
	if (!file)
955
		goto err;
M
Miklos Szeredi 已提交
956

957 958
	if (file->f_op != &fuse_dev_operations)
		goto err_fput;
M
Miklos Szeredi 已提交
959

960
	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
961 962 963
	err = -ENOMEM;
	if (!fc)
		goto err_fput;
M
Miklos Szeredi 已提交
964

965 966 967
	fuse_conn_init(fc);

	fc->dev = sb->s_dev;
J
John Muir 已提交
968
	fc->sb = sb;
969 970 971
	err = fuse_bdi_init(fc, sb);
	if (err)
		goto err_put_conn;
972

J
Jens Axboe 已提交
973 974
	sb->s_bdi = &fc->bdi;

975 976 977 978 979
	/* Handle umasking inside the fuse code */
	if (sb->s_flags & MS_POSIXACL)
		fc->dont_mask = 1;
	sb->s_flags |= MS_POSIXACL;

T
Tejun Heo 已提交
980
	fc->release = fuse_free_conn;
M
Miklos Szeredi 已提交
981
	fc->flags = d.flags;
M
Miklos Szeredi 已提交
982
	fc->user_id = d.user_id;
983
	fc->group_id = d.group_id;
984
	fc->max_read = max_t(unsigned, 4096, d.max_read);
M
Miklos Szeredi 已提交
985

986 987 988
	/* Used by get_root_inode() */
	sb->s_fs_info = fc;

M
Miklos Szeredi 已提交
989
	err = -ENOMEM;
990
	root = fuse_get_root_inode(sb, d.rootmode);
991
	if (!root)
992
		goto err_put_conn;
M
Miklos Szeredi 已提交
993

994 995
	root_dentry = d_alloc_root(root);
	if (!root_dentry) {
M
Miklos Szeredi 已提交
996
		iput(root);
997
		goto err_put_conn;
M
Miklos Szeredi 已提交
998
	}
A
Al Viro 已提交
999 1000
	/* only now - we want root dentry with NULL ->d_op */
	sb->s_d_op = &fuse_dentry_operations;
1001

1002 1003 1004 1005
	init_req = fuse_request_alloc();
	if (!init_req)
		goto err_put_root;

1006 1007 1008
	if (is_bdev) {
		fc->destroy_req = fuse_request_alloc();
		if (!fc->destroy_req)
J
Julia Lawall 已提交
1009
			goto err_free_init_req;
1010 1011
	}

1012
	mutex_lock(&fuse_mutex);
1013 1014
	err = -EINVAL;
	if (file->private_data)
1015
		goto err_unlock;
1016

1017 1018 1019 1020 1021
	err = fuse_ctl_add_conn(fc);
	if (err)
		goto err_unlock;

	list_add_tail(&fc->entry, &fuse_conn_list);
1022 1023
	sb->s_root = root_dentry;
	fc->connected = 1;
1024 1025
	file->private_data = fuse_conn_get(fc);
	mutex_unlock(&fuse_mutex);
M
Miklos Szeredi 已提交
1026 1027 1028 1029 1030 1031
	/*
	 * atomic_dec_and_test() in fput() provides the necessary
	 * memory barrier for file->private_data to be visible on all
	 * CPUs after this
	 */
	fput(file);
1032

1033
	fuse_send_init(fc, init_req);
1034

M
Miklos Szeredi 已提交
1035 1036
	return 0;

1037 1038
 err_unlock:
	mutex_unlock(&fuse_mutex);
J
Julia Lawall 已提交
1039
 err_free_init_req:
1040
	fuse_request_free(init_req);
1041 1042
 err_put_root:
	dput(root_dentry);
1043
 err_put_conn:
1044
	fuse_bdi_destroy(fc);
1045
	fuse_conn_put(fc);
1046 1047 1048
 err_fput:
	fput(file);
 err:
M
Miklos Szeredi 已提交
1049 1050 1051
	return err;
}

A
Al Viro 已提交
1052
static struct dentry *fuse_mount(struct file_system_type *fs_type,
1053
		       int flags, const char *dev_name,
A
Al Viro 已提交
1054
		       void *raw_data)
M
Miklos Szeredi 已提交
1055
{
A
Al Viro 已提交
1056
	return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
M
Miklos Szeredi 已提交
1057 1058
}

J
John Muir 已提交
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
static void fuse_kill_sb_anon(struct super_block *sb)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);

	if (fc) {
		down_write(&fc->killsb);
		fc->sb = NULL;
		up_write(&fc->killsb);
	}

	kill_anon_super(sb);
}

1072 1073 1074
static struct file_system_type fuse_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuse",
M
Miklos Szeredi 已提交
1075
	.fs_flags	= FS_HAS_SUBTYPE,
A
Al Viro 已提交
1076
	.mount		= fuse_mount,
J
John Muir 已提交
1077
	.kill_sb	= fuse_kill_sb_anon,
1078 1079 1080
};

#ifdef CONFIG_BLOCK
A
Al Viro 已提交
1081
static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
1082
			   int flags, const char *dev_name,
A
Al Viro 已提交
1083
			   void *raw_data)
1084
{
A
Al Viro 已提交
1085
	return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
1086 1087
}

J
John Muir 已提交
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100
static void fuse_kill_sb_blk(struct super_block *sb)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);

	if (fc) {
		down_write(&fc->killsb);
		fc->sb = NULL;
		up_write(&fc->killsb);
	}

	kill_block_super(sb);
}

1101 1102 1103
static struct file_system_type fuseblk_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuseblk",
A
Al Viro 已提交
1104
	.mount		= fuse_mount_blk,
J
John Muir 已提交
1105
	.kill_sb	= fuse_kill_sb_blk,
A
Alexey Dobriyan 已提交
1106
	.fs_flags	= FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
1107 1108
};

1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
static inline int register_fuseblk(void)
{
	return register_filesystem(&fuseblk_fs_type);
}

static inline void unregister_fuseblk(void)
{
	unregister_filesystem(&fuseblk_fs_type);
}
#else
static inline int register_fuseblk(void)
{
	return 0;
}

static inline void unregister_fuseblk(void)
{
}
#endif

1129
static void fuse_inode_init_once(void *foo)
M
Miklos Szeredi 已提交
1130
{
M
Miklos Szeredi 已提交
1131
	struct inode *inode = foo;
M
Miklos Szeredi 已提交
1132

C
Christoph Lameter 已提交
1133
	inode_init_once(inode);
M
Miklos Szeredi 已提交
1134 1135 1136 1137 1138 1139
}

static int __init fuse_fs_init(void)
{
	int err;

1140 1141 1142
	fuse_inode_cachep = kmem_cache_create("fuse_inode",
					      sizeof(struct fuse_inode),
					      0, SLAB_HWCACHE_ALIGN,
1143
					      fuse_inode_init_once);
1144 1145
	err = -ENOMEM;
	if (!fuse_inode_cachep)
1146 1147 1148 1149 1150 1151 1152 1153 1154
		goto out;

	err = register_fuseblk();
	if (err)
		goto out2;

	err = register_filesystem(&fuse_fs_type);
	if (err)
		goto out3;
1155 1156

	return 0;
M
Miklos Szeredi 已提交
1157

1158
 out3:
1159
	unregister_fuseblk();
1160 1161
 out2:
	kmem_cache_destroy(fuse_inode_cachep);
1162
 out:
M
Miklos Szeredi 已提交
1163 1164 1165 1166 1167 1168
	return err;
}

static void fuse_fs_cleanup(void)
{
	unregister_filesystem(&fuse_fs_type);
1169
	unregister_fuseblk();
M
Miklos Szeredi 已提交
1170 1171 1172
	kmem_cache_destroy(fuse_inode_cachep);
}

1173 1174 1175
static struct kobject *fuse_kobj;
static struct kobject *connections_kobj;

1176 1177 1178 1179
static int fuse_sysfs_init(void)
{
	int err;

1180
	fuse_kobj = kobject_create_and_add("fuse", fs_kobj);
1181 1182
	if (!fuse_kobj) {
		err = -ENOMEM;
1183
		goto out_err;
1184
	}
1185

1186 1187 1188
	connections_kobj = kobject_create_and_add("connections", fuse_kobj);
	if (!connections_kobj) {
		err = -ENOMEM;
1189
		goto out_fuse_unregister;
1190
	}
1191 1192 1193 1194

	return 0;

 out_fuse_unregister:
1195
	kobject_put(fuse_kobj);
1196 1197 1198 1199 1200 1201
 out_err:
	return err;
}

static void fuse_sysfs_cleanup(void)
{
1202 1203
	kobject_put(connections_kobj);
	kobject_put(fuse_kobj);
1204 1205
}

M
Miklos Szeredi 已提交
1206 1207 1208 1209
static int __init fuse_init(void)
{
	int res;

M
Miklos Szeredi 已提交
1210
	printk(KERN_INFO "fuse init (API version %i.%i)\n",
M
Miklos Szeredi 已提交
1211 1212
	       FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);

1213
	INIT_LIST_HEAD(&fuse_conn_list);
M
Miklos Szeredi 已提交
1214 1215 1216 1217
	res = fuse_fs_init();
	if (res)
		goto err;

M
Miklos Szeredi 已提交
1218 1219 1220 1221
	res = fuse_dev_init();
	if (res)
		goto err_fs_cleanup;

1222 1223 1224 1225
	res = fuse_sysfs_init();
	if (res)
		goto err_dev_cleanup;

1226 1227 1228 1229
	res = fuse_ctl_init();
	if (res)
		goto err_sysfs_cleanup;

1230 1231 1232
	sanitize_global_limit(&max_user_bgreq);
	sanitize_global_limit(&max_user_congthresh);

M
Miklos Szeredi 已提交
1233 1234
	return 0;

1235 1236
 err_sysfs_cleanup:
	fuse_sysfs_cleanup();
1237 1238
 err_dev_cleanup:
	fuse_dev_cleanup();
M
Miklos Szeredi 已提交
1239 1240
 err_fs_cleanup:
	fuse_fs_cleanup();
M
Miklos Szeredi 已提交
1241 1242 1243 1244 1245 1246 1247 1248
 err:
	return res;
}

static void __exit fuse_exit(void)
{
	printk(KERN_DEBUG "fuse exit\n");

1249
	fuse_ctl_cleanup();
1250
	fuse_sysfs_cleanup();
M
Miklos Szeredi 已提交
1251
	fuse_fs_cleanup();
M
Miklos Szeredi 已提交
1252
	fuse_dev_cleanup();
M
Miklos Szeredi 已提交
1253 1254 1255 1256
}

module_init(fuse_init);
module_exit(fuse_exit);