[mirror_ubuntu-hirsute-kernel.git] / fs / fuse / inode.c

/*
  FUSE: Filesystem in Userspace
  Copyright (C) 2001-2005  Miklos Szeredi <miklos@szeredi.hu>

  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/mount.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/statfs.h>

MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
MODULE_DESCRIPTION("Filesystem in Userspace");
MODULE_LICENSE("GPL");

spinlock_t fuse_lock;
static kmem_cache_t *fuse_inode_cachep;

#define FUSE_SUPER_MAGIC 0x65735546

struct fuse_mount_data {
	int fd;
	unsigned rootmode;
	unsigned user_id;
	unsigned group_id;
	unsigned flags;
	unsigned max_read;
};

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

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

	fi = get_fuse_inode(inode);
	fi->i_time = jiffies - 1;
	fi->nodeid = 0;
	fi->nlookup = 0;
	fi->forget_req = fuse_request_alloc();
	if (!fi->forget_req) {
		kmem_cache_free(fuse_inode_cachep, inode);
		return NULL;
	}

	return inode;
}

static void fuse_destroy_inode(struct inode *inode)
{
	struct fuse_inode *fi = get_fuse_inode(inode);
	if (fi->forget_req)
		fuse_request_free(fi->forget_req);
	kmem_cache_free(fuse_inode_cachep, inode);
}

static void fuse_read_inode(struct inode *inode)
{
	/* No op */
}

void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
		      unsigned long nodeid, u64 nlookup)
{
	struct fuse_forget_in *inarg = &req->misc.forget_in;
	inarg->nlookup = nlookup;
	req->in.h.opcode = FUSE_FORGET;
	req->in.h.nodeid = nodeid;
	req->in.numargs = 1;
	req->in.args[0].size = sizeof(struct fuse_forget_in);
	req->in.args[0].value = inarg;
	request_send_noreply(fc, req);
}

static void fuse_clear_inode(struct inode *inode)
{
	if (inode->i_sb->s_flags & MS_ACTIVE) {
		struct fuse_conn *fc = get_fuse_conn(inode);
		struct fuse_inode *fi = get_fuse_inode(inode);
		fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
		fi->forget_req = NULL;
	}
}

void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
{
	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
		invalidate_inode_pages(inode->i_mapping);

	inode->i_ino     = attr->ino;
	inode->i_mode    = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
	inode->i_nlink   = attr->nlink;
	inode->i_uid     = attr->uid;
	inode->i_gid     = attr->gid;
	i_size_write(inode, attr->size);
	inode->i_blksize = PAGE_CACHE_SIZE;
	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;
}

static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
{
	inode->i_mode = attr->mode & S_IFMT;
	i_size_write(inode, attr->size);
	if (S_ISREG(inode->i_mode)) {
		fuse_init_common(inode);
		fuse_init_file_inode(inode);
	} 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));
	} else {
		/* Don't let user create weird files */
		inode->i_mode = S_IFREG;
		fuse_init_common(inode);
		fuse_init_file_inode(inode);
	}
}

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

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

struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
			int generation, struct fuse_attr *attr)
{
	struct inode *inode;
	struct fuse_inode *fi;
	struct fuse_conn *fc = get_fuse_conn_super(sb);
	int retried = 0;

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

	if ((inode->i_state & I_NEW)) {
		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) {
		BUG_ON(retried);
		/* Inode has changed type, any I/O on the old should fail */
		make_bad_inode(inode);
		iput(inode);
		retried = 1;
		goto retry;
	}

	fi = get_fuse_inode(inode);
	fi->nlookup ++;
	fuse_change_attributes(inode, attr);
	return inode;
}

static void fuse_put_super(struct super_block *sb)
{
	struct fuse_conn *fc = get_fuse_conn_super(sb);

	down_write(&fc->sbput_sem);
	while (!list_empty(&fc->background))
		fuse_release_background(list_entry(fc->background.next,
						   struct fuse_req, bg_entry));

	spin_lock(&fuse_lock);
	fc->mounted = 0;
	fc->user_id = 0;
	fc->group_id = 0;
	fc->flags = 0;
	/* Flush all readers on this fs */
	wake_up_all(&fc->waitq);
	up_write(&fc->sbput_sem);
	fuse_release_conn(fc);
	spin_unlock(&fuse_lock);
}

static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
{
	stbuf->f_type    = FUSE_SUPER_MAGIC;
	stbuf->f_bsize   = attr->bsize;
	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 */
}

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

        req = fuse_get_request(fc);
	if (!req)
		return -ERESTARTSYS;

	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
	req->out.numargs = 1;
	req->out.args[0].size = sizeof(outarg);
	req->out.args[0].value = &outarg;
	request_send(fc, req);
	err = req->out.h.error;
	if (!err)
		convert_fuse_statfs(buf, &outarg.st);
	fuse_put_request(fc, req);
	return err;
}

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

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

static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
{
	char *p;
	memset(d, 0, sizeof(struct fuse_mount_data));
	d->fd = -1;
	d->max_read = ~0;

	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;
			break;

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

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

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

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

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

		case OPT_KERNEL_CACHE:
			d->flags |= FUSE_KERNEL_CACHE;
			break;

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

		default:
			return 0;
		}
	}
	if (d->fd == -1)
		return 0;

	return 1;
}

static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);

	seq_printf(m, ",user_id=%u", fc->user_id);
	seq_printf(m, ",group_id=%u", fc->group_id);
	if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
		seq_puts(m, ",default_permissions");
	if (fc->flags & FUSE_ALLOW_OTHER)
		seq_puts(m, ",allow_other");
	if (fc->flags & FUSE_KERNEL_CACHE)
		seq_puts(m, ",kernel_cache");
	if (fc->max_read != ~0)
		seq_printf(m, ",max_read=%u", fc->max_read);
	return 0;
}

static void free_conn(struct fuse_conn *fc)
{
	while (!list_empty(&fc->unused_list)) {
		struct fuse_req *req;
		req = list_entry(fc->unused_list.next, struct fuse_req, list);
		list_del(&req->list);
		fuse_request_free(req);
	}
	kfree(fc);
}

/* Must be called with the fuse lock held */
void fuse_release_conn(struct fuse_conn *fc)
{
	fc->count--;
	if (!fc->count)
		free_conn(fc);
}

static struct fuse_conn *new_conn(void)
{
	struct fuse_conn *fc;

	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
	if (fc != NULL) {
		int i;
		memset(fc, 0, sizeof(*fc));
		init_waitqueue_head(&fc->waitq);
		INIT_LIST_HEAD(&fc->pending);
		INIT_LIST_HEAD(&fc->processing);
		INIT_LIST_HEAD(&fc->unused_list);
		INIT_LIST_HEAD(&fc->background);
		sema_init(&fc->outstanding_sem, 0);
		init_rwsem(&fc->sbput_sem);
		for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
			struct fuse_req *req = fuse_request_alloc();
			if (!req) {
				free_conn(fc);
				return NULL;
			}
			list_add(&req->list, &fc->unused_list);
		}
		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
		fc->bdi.unplug_io_fn = default_unplug_io_fn;
		fc->reqctr = 0;
	}
	return fc;
}

static struct fuse_conn *get_conn(struct file *file, struct super_block *sb)
{
	struct fuse_conn *fc;

	if (file->f_op != &fuse_dev_operations)
		return ERR_PTR(-EINVAL);
	fc = new_conn();
	if (fc == NULL)
		return ERR_PTR(-ENOMEM);
	spin_lock(&fuse_lock);
	if (file->private_data) {
		free_conn(fc);
		fc = ERR_PTR(-EINVAL);
	} else {
		file->private_data = fc;
		*get_fuse_conn_super_p(sb) = fc;
		fc->mounted = 1;
		fc->connected = 1;
		fc->count = 2;
	}
	spin_unlock(&fuse_lock);
	return fc;
}

static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
{
	struct fuse_attr attr;
	memset(&attr, 0, sizeof(attr));

	attr.mode = mode;
	attr.ino = FUSE_ROOT_ID;
	return fuse_iget(sb, 1, 0, &attr);
}

static struct super_operations fuse_super_operations = {
	.alloc_inode    = fuse_alloc_inode,
	.destroy_inode  = fuse_destroy_inode,
	.read_inode	= fuse_read_inode,
	.clear_inode	= fuse_clear_inode,
	.put_super	= fuse_put_super,
	.statfs		= fuse_statfs,
	.show_options	= fuse_show_options,
};

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;
	int err;

	if (!parse_fuse_opt((char *) data, &d))
		return -EINVAL;

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = FUSE_SUPER_MAGIC;
	sb->s_op = &fuse_super_operations;
	sb->s_maxbytes = MAX_LFS_FILESIZE;

	file = fget(d.fd);
	if (!file)
		return -EINVAL;

	fc = get_conn(file, sb);
	fput(file);
	if (IS_ERR(fc))
		return PTR_ERR(fc);

	fc->flags = d.flags;
	fc->user_id = d.user_id;
	fc->group_id = d.group_id;
	fc->max_read = d.max_read;
	if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
		fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;

	err = -ENOMEM;
	root = get_root_inode(sb, d.rootmode);
	if (root == NULL)
		goto err;

	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		goto err;
	}
	fuse_send_init(fc);
	return 0;

 err:
	spin_lock(&fuse_lock);
	fuse_release_conn(fc);
	spin_unlock(&fuse_lock);
	return err;
}

static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
				       int flags, const char *dev_name,
				       void *raw_data)
{
	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
}

static struct file_system_type fuse_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "fuse",
	.get_sb		= fuse_get_sb,
	.kill_sb	= kill_anon_super,
};

static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
				 unsigned long flags)
{
	struct inode * inode = foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR)
		inode_init_once(inode);
}

static int __init fuse_fs_init(void)
{
	int err;

	err = register_filesystem(&fuse_fs_type);
	if (err)
		printk("fuse: failed to register filesystem\n");
	else {
		fuse_inode_cachep = kmem_cache_create("fuse_inode",
						      sizeof(struct fuse_inode),
						      0, SLAB_HWCACHE_ALIGN,
						      fuse_inode_init_once, NULL);
		if (!fuse_inode_cachep) {
			unregister_filesystem(&fuse_fs_type);
			err = -ENOMEM;
		}
	}

	return err;
}

static void fuse_fs_cleanup(void)
{
	unregister_filesystem(&fuse_fs_type);
	kmem_cache_destroy(fuse_inode_cachep);
}

static int __init fuse_init(void)
{
	int res;

	printk("fuse init (API version %i.%i)\n",
	       FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);

	spin_lock_init(&fuse_lock);
	res = fuse_fs_init();
	if (res)
		goto err;

	res = fuse_dev_init();
	if (res)
		goto err_fs_cleanup;

	return 0;

 err_fs_cleanup:
	fuse_fs_cleanup();
 err:
	return res;
}

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

	fuse_fs_cleanup();
	fuse_dev_cleanup();
}

module_init(fuse_init);
module_exit(fuse_exit);
Commit	Line	Data
d8a5ba45 MS	1	/*
	2	FUSE: Filesystem in Userspace
	3	Copyright (C) 2001-2005 Miklos Szeredi <miklos@szeredi.hu>
	4
	5	This program can be distributed under the terms of the GNU GPL.
	6	See the file COPYING.
	7	*/
	8
	9	#include "fuse_i.h"
	10
	11	#include <linux/pagemap.h>
	12	#include <linux/slab.h>
	13	#include <linux/file.h>
	14	#include <linux/mount.h>
	15	#include <linux/seq_file.h>
	16	#include <linux/init.h>
	17	#include <linux/module.h>
d8a5ba45 MS	18	#include <linux/parser.h>
	19	#include <linux/statfs.h>
	20
	21	MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
	22	MODULE_DESCRIPTION("Filesystem in Userspace");
	23	MODULE_LICENSE("GPL");
	24
	25	spinlock_t fuse_lock;
	26	static kmem_cache_t *fuse_inode_cachep;
d8a5ba45 MS	27
	28	#define FUSE_SUPER_MAGIC 0x65735546
	29
	30	struct fuse_mount_data {
	31	int fd;
	32	unsigned rootmode;
	33	unsigned user_id;
87729a55	34	unsigned group_id;
1e9a4ed9	35	unsigned flags;
db50b96c	36	unsigned max_read;
d8a5ba45 MS	37	};
	38
	39	static struct inode fuse_alloc_inode(struct super_block sb)
	40	{
	41	struct inode *inode;
	42	struct fuse_inode *fi;
	43
	44	inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
	45	if (!inode)
	46	return NULL;
	47
	48	fi = get_fuse_inode(inode);
	49	fi->i_time = jiffies - 1;
	50	fi->nodeid = 0;
9e6268db	51	fi->nlookup = 0;
e5e5558e MS	52	fi->forget_req = fuse_request_alloc();
	53	if (!fi->forget_req) {
	54	kmem_cache_free(fuse_inode_cachep, inode);
	55	return NULL;
	56	}
d8a5ba45 MS	57
	58	return inode;
	59	}
	60
	61	static void fuse_destroy_inode(struct inode *inode)
	62	{
e5e5558e MS	63	struct fuse_inode *fi = get_fuse_inode(inode);
	64	if (fi->forget_req)
	65	fuse_request_free(fi->forget_req);
d8a5ba45 MS	66	kmem_cache_free(fuse_inode_cachep, inode);
	67	}
	68
	69	static void fuse_read_inode(struct inode *inode)
	70	{
	71	/* No op */
	72	}
	73
e5e5558e	74	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
9e6268db	75	unsigned long nodeid, u64 nlookup)
e5e5558e MS	76	{
e5e5558e MS	77	struct fuse_forget_in *inarg = &req->misc.forget_in;
9e6268db	78	inarg->nlookup = nlookup;
e5e5558e MS	79	req->in.h.opcode = FUSE_FORGET;
	80	req->in.h.nodeid = nodeid;
	81	req->in.numargs = 1;
	82	req->in.args[0].size = sizeof(struct fuse_forget_in);
	83	req->in.args[0].value = inarg;
	84	request_send_noreply(fc, req);
	85	}
	86
d8a5ba45 MS	87	static void fuse_clear_inode(struct inode *inode)
d8a5ba45 MS	88	{
1e9a4ed9 MS	89	if (inode->i_sb->s_flags & MS_ACTIVE) {
1e9a4ed9 MS	90	struct fuse_conn *fc = get_fuse_conn(inode);
e5e5558e	91	struct fuse_inode *fi = get_fuse_inode(inode);
9e6268db	92	fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
e5e5558e MS	93	fi->forget_req = NULL;
e5e5558e MS	94	}
d8a5ba45 MS	95	}
	96
	97	void fuse_change_attributes(struct inode inode, struct fuse_attr attr)
	98	{
	99	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
	100	invalidate_inode_pages(inode->i_mapping);
	101
	102	inode->i_ino = attr->ino;
	103	inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
	104	inode->i_nlink = attr->nlink;
	105	inode->i_uid = attr->uid;
	106	inode->i_gid = attr->gid;
	107	i_size_write(inode, attr->size);
	108	inode->i_blksize = PAGE_CACHE_SIZE;
	109	inode->i_blocks = attr->blocks;
	110	inode->i_atime.tv_sec = attr->atime;
	111	inode->i_atime.tv_nsec = attr->atimensec;
	112	inode->i_mtime.tv_sec = attr->mtime;
	113	inode->i_mtime.tv_nsec = attr->mtimensec;
	114	inode->i_ctime.tv_sec = attr->ctime;
	115	inode->i_ctime.tv_nsec = attr->ctimensec;
	116	}
	117
	118	static void fuse_init_inode(struct inode inode, struct fuse_attr attr)
	119	{
	120	inode->i_mode = attr->mode & S_IFMT;
	121	i_size_write(inode, attr->size);
e5e5558e MS	122	if (S_ISREG(inode->i_mode)) {
e5e5558e MS	123	fuse_init_common(inode);
b6aeaded	124	fuse_init_file_inode(inode);
e5e5558e MS	125	} else if (S_ISDIR(inode->i_mode))
	126	fuse_init_dir(inode);
	127	else if (S_ISLNK(inode->i_mode))
	128	fuse_init_symlink(inode);
	129	else if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode) \|\|
	130	S_ISFIFO(inode->i_mode) \|\| S_ISSOCK(inode->i_mode)) {
	131	fuse_init_common(inode);
	132	init_special_inode(inode, inode->i_mode,
	133	new_decode_dev(attr->rdev));
	134	} else {
	135	/* Don't let user create weird files */
	136	inode->i_mode = S_IFREG;
	137	fuse_init_common(inode);
b6aeaded	138	fuse_init_file_inode(inode);
e5e5558e	139	}
d8a5ba45 MS	140	}
	141
	142	static int fuse_inode_eq(struct inode inode, void _nodeidp)
	143	{
	144	unsigned long nodeid = (unsigned long ) _nodeidp;
	145	if (get_node_id(inode) == nodeid)
	146	return 1;
	147	else
	148	return 0;
	149	}
	150
	151	static int fuse_inode_set(struct inode inode, void _nodeidp)
	152	{
	153	unsigned long nodeid = (unsigned long ) _nodeidp;
	154	get_fuse_inode(inode)->nodeid = nodeid;
	155	return 0;
	156	}
	157
	158	struct inode fuse_iget(struct super_block sb, unsigned long nodeid,
9e6268db	159	int generation, struct fuse_attr *attr)
d8a5ba45 MS	160	{
d8a5ba45 MS	161	struct inode *inode;
9e6268db	162	struct fuse_inode *fi;
d8a5ba45 MS	163	struct fuse_conn *fc = get_fuse_conn_super(sb);
	164	int retried = 0;
	165
	166	retry:
	167	inode = iget5_locked(sb, nodeid, fuse_inode_eq, fuse_inode_set, &nodeid);
	168	if (!inode)
	169	return NULL;
	170
	171	if ((inode->i_state & I_NEW)) {
	172	inode->i_generation = generation;
	173	inode->i_data.backing_dev_info = &fc->bdi;
	174	fuse_init_inode(inode, attr);
	175	unlock_new_inode(inode);
	176	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
	177	BUG_ON(retried);
	178	/* Inode has changed type, any I/O on the old should fail */
	179	make_bad_inode(inode);
	180	iput(inode);
	181	retried = 1;
	182	goto retry;
	183	}
	184
9e6268db MS	185	fi = get_fuse_inode(inode);
9e6268db MS	186	fi->nlookup ++;
d8a5ba45	187	fuse_change_attributes(inode, attr);
d8a5ba45 MS	188	return inode;
	189	}
	190
	191	static void fuse_put_super(struct super_block *sb)
	192	{
	193	struct fuse_conn *fc = get_fuse_conn_super(sb);
	194
1e9a4ed9 MS	195	down_write(&fc->sbput_sem);
	196	while (!list_empty(&fc->background))
	197	fuse_release_background(list_entry(fc->background.next,
	198	struct fuse_req, bg_entry));
	199
d8a5ba45	200	spin_lock(&fuse_lock);
1e9a4ed9	201	fc->mounted = 0;
d8a5ba45	202	fc->user_id = 0;
87729a55	203	fc->group_id = 0;
1e9a4ed9	204	fc->flags = 0;
334f485d MS	205	/* Flush all readers on this fs */
334f485d MS	206	wake_up_all(&fc->waitq);
1e9a4ed9	207	up_write(&fc->sbput_sem);
d8a5ba45	208	fuse_release_conn(fc);
d8a5ba45 MS	209	spin_unlock(&fuse_lock);
	210	}
	211
e5e5558e MS	212	static void convert_fuse_statfs(struct kstatfs stbuf, struct fuse_kstatfs attr)
	213	{
	214	stbuf->f_type = FUSE_SUPER_MAGIC;
	215	stbuf->f_bsize = attr->bsize;
	216	stbuf->f_blocks = attr->blocks;
	217	stbuf->f_bfree = attr->bfree;
	218	stbuf->f_bavail = attr->bavail;
	219	stbuf->f_files = attr->files;
	220	stbuf->f_ffree = attr->ffree;
	221	stbuf->f_namelen = attr->namelen;
	222	/* fsid is left zero */
	223	}
	224
	225	static int fuse_statfs(struct super_block sb, struct kstatfs buf)
	226	{
	227	struct fuse_conn *fc = get_fuse_conn_super(sb);
	228	struct fuse_req *req;
	229	struct fuse_statfs_out outarg;
	230	int err;
	231
	232	req = fuse_get_request(fc);
	233	if (!req)
	234	return -ERESTARTSYS;
	235
	236	req->in.numargs = 0;
	237	req->in.h.opcode = FUSE_STATFS;
	238	req->out.numargs = 1;
	239	req->out.args[0].size = sizeof(outarg);
	240	req->out.args[0].value = &outarg;
	241	request_send(fc, req);
	242	err = req->out.h.error;
	243	if (!err)
	244	convert_fuse_statfs(buf, &outarg.st);
	245	fuse_put_request(fc, req);
	246	return err;
	247	}
	248
d8a5ba45 MS	249	enum {
	250	OPT_FD,
	251	OPT_ROOTMODE,
	252	OPT_USER_ID,
87729a55	253	OPT_GROUP_ID,
d8a5ba45 MS	254	OPT_DEFAULT_PERMISSIONS,
d8a5ba45 MS	255	OPT_ALLOW_OTHER,
d8a5ba45	256	OPT_KERNEL_CACHE,
db50b96c	257	OPT_MAX_READ,
d8a5ba45 MS	258	OPT_ERR
	259	};
	260
	261	static match_table_t tokens = {
	262	{OPT_FD, "fd=%u"},
	263	{OPT_ROOTMODE, "rootmode=%o"},
	264	{OPT_USER_ID, "user_id=%u"},
87729a55	265	{OPT_GROUP_ID, "group_id=%u"},
d8a5ba45 MS	266	{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
d8a5ba45 MS	267	{OPT_ALLOW_OTHER, "allow_other"},
d8a5ba45	268	{OPT_KERNEL_CACHE, "kernel_cache"},
db50b96c	269	{OPT_MAX_READ, "max_read=%u"},
d8a5ba45 MS	270	{OPT_ERR, NULL}
	271	};
	272
	273	static int parse_fuse_opt(char opt, struct fuse_mount_data d)
	274	{
	275	char *p;
	276	memset(d, 0, sizeof(struct fuse_mount_data));
	277	d->fd = -1;
db50b96c	278	d->max_read = ~0;
d8a5ba45 MS	279
	280	while ((p = strsep(&opt, ",")) != NULL) {
	281	int token;
	282	int value;
	283	substring_t args[MAX_OPT_ARGS];
	284	if (!*p)
	285	continue;
	286
	287	token = match_token(p, tokens, args);
	288	switch (token) {
	289	case OPT_FD:
	290	if (match_int(&args[0], &value))
	291	return 0;
	292	d->fd = value;
	293	break;
	294
	295	case OPT_ROOTMODE:
	296	if (match_octal(&args[0], &value))
	297	return 0;
	298	d->rootmode = value;
	299	break;
	300
	301	case OPT_USER_ID:
	302	if (match_int(&args[0], &value))
	303	return 0;
	304	d->user_id = value;
	305	break;
	306
87729a55 MS	307	case OPT_GROUP_ID:
	308	if (match_int(&args[0], &value))
	309	return 0;
	310	d->group_id = value;
	311	break;
	312
1e9a4ed9 MS	313	case OPT_DEFAULT_PERMISSIONS:
	314	d->flags \|= FUSE_DEFAULT_PERMISSIONS;
	315	break;
	316
	317	case OPT_ALLOW_OTHER:
	318	d->flags \|= FUSE_ALLOW_OTHER;
	319	break;
	320
	321	case OPT_KERNEL_CACHE:
	322	d->flags \|= FUSE_KERNEL_CACHE;
	323	break;
	324
db50b96c MS	325	case OPT_MAX_READ:
	326	if (match_int(&args[0], &value))
	327	return 0;
	328	d->max_read = value;
	329	break;
	330
d8a5ba45 MS	331	default:
	332	return 0;
	333	}
	334	}
	335	if (d->fd == -1)
	336	return 0;
	337
	338	return 1;
	339	}
	340
	341	static int fuse_show_options(struct seq_file m, struct vfsmount mnt)
	342	{
	343	struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
	344
	345	seq_printf(m, ",user_id=%u", fc->user_id);
87729a55	346	seq_printf(m, ",group_id=%u", fc->group_id);
1e9a4ed9 MS	347	if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
	348	seq_puts(m, ",default_permissions");
	349	if (fc->flags & FUSE_ALLOW_OTHER)
	350	seq_puts(m, ",allow_other");
	351	if (fc->flags & FUSE_KERNEL_CACHE)
	352	seq_puts(m, ",kernel_cache");
db50b96c MS	353	if (fc->max_read != ~0)
db50b96c MS	354	seq_printf(m, ",max_read=%u", fc->max_read);
d8a5ba45 MS	355	return 0;
	356	}
	357
334f485d	358	static void free_conn(struct fuse_conn *fc)
d8a5ba45	359	{
334f485d MS	360	while (!list_empty(&fc->unused_list)) {
	361	struct fuse_req *req;
	362	req = list_entry(fc->unused_list.next, struct fuse_req, list);
	363	list_del(&req->list);
	364	fuse_request_free(req);
	365	}
d8a5ba45 MS	366	kfree(fc);
	367	}
	368
334f485d MS	369	/* Must be called with the fuse lock held */
	370	void fuse_release_conn(struct fuse_conn *fc)
	371	{
1e9a4ed9 MS	372	fc->count--;
1e9a4ed9 MS	373	if (!fc->count)
334f485d MS	374	free_conn(fc);
	375	}
	376
d8a5ba45 MS	377	static struct fuse_conn *new_conn(void)
	378	{
	379	struct fuse_conn *fc;
	380
	381	fc = kmalloc(sizeof(*fc), GFP_KERNEL);
	382	if (fc != NULL) {
334f485d	383	int i;
d8a5ba45	384	memset(fc, 0, sizeof(*fc));
334f485d MS	385	init_waitqueue_head(&fc->waitq);
	386	INIT_LIST_HEAD(&fc->pending);
	387	INIT_LIST_HEAD(&fc->processing);
	388	INIT_LIST_HEAD(&fc->unused_list);
1e9a4ed9	389	INIT_LIST_HEAD(&fc->background);
334f485d	390	sema_init(&fc->outstanding_sem, 0);
1e9a4ed9	391	init_rwsem(&fc->sbput_sem);
334f485d MS	392	for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
	393	struct fuse_req *req = fuse_request_alloc();
	394	if (!req) {
	395	free_conn(fc);
	396	return NULL;
	397	}
	398	list_add(&req->list, &fc->unused_list);
	399	}
d8a5ba45 MS	400	fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
d8a5ba45 MS	401	fc->bdi.unplug_io_fn = default_unplug_io_fn;
334f485d	402	fc->reqctr = 0;
d8a5ba45 MS	403	}
	404	return fc;
	405	}
	406
	407	static struct fuse_conn get_conn(struct file file, struct super_block *sb)
	408	{
	409	struct fuse_conn *fc;
	410
334f485d MS	411	if (file->f_op != &fuse_dev_operations)
334f485d MS	412	return ERR_PTR(-EINVAL);
d8a5ba45 MS	413	fc = new_conn();
d8a5ba45 MS	414	if (fc == NULL)
334f485d	415	return ERR_PTR(-ENOMEM);
d8a5ba45	416	spin_lock(&fuse_lock);
334f485d MS	417	if (file->private_data) {
	418	free_conn(fc);
	419	fc = ERR_PTR(-EINVAL);
	420	} else {
	421	file->private_data = fc;
1e9a4ed9 MS	422	*get_fuse_conn_super_p(sb) = fc;
	423	fc->mounted = 1;
	424	fc->connected = 1;
	425	fc->count = 2;
334f485d	426	}
d8a5ba45 MS	427	spin_unlock(&fuse_lock);
	428	return fc;
	429	}
	430
	431	static struct inode get_root_inode(struct super_block sb, unsigned mode)
	432	{
	433	struct fuse_attr attr;
	434	memset(&attr, 0, sizeof(attr));
	435
	436	attr.mode = mode;
	437	attr.ino = FUSE_ROOT_ID;
9e6268db	438	return fuse_iget(sb, 1, 0, &attr);
d8a5ba45 MS	439	}
	440
	441	static struct super_operations fuse_super_operations = {
	442	.alloc_inode = fuse_alloc_inode,
	443	.destroy_inode = fuse_destroy_inode,
	444	.read_inode = fuse_read_inode,
	445	.clear_inode = fuse_clear_inode,
	446	.put_super = fuse_put_super,
e5e5558e	447	.statfs = fuse_statfs,
d8a5ba45 MS	448	.show_options = fuse_show_options,
	449	};
	450
d8a5ba45 MS	451	static int fuse_fill_super(struct super_block sb, void data, int silent)
	452	{
	453	struct fuse_conn *fc;
	454	struct inode *root;
	455	struct fuse_mount_data d;
	456	struct file *file;
	457	int err;
	458
	459	if (!parse_fuse_opt((char *) data, &d))
	460	return -EINVAL;
	461
	462	sb->s_blocksize = PAGE_CACHE_SIZE;
	463	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	464	sb->s_magic = FUSE_SUPER_MAGIC;
	465	sb->s_op = &fuse_super_operations;
	466	sb->s_maxbytes = MAX_LFS_FILESIZE;
	467
	468	file = fget(d.fd);
	469	if (!file)
	470	return -EINVAL;
	471
	472	fc = get_conn(file, sb);
	473	fput(file);
334f485d MS	474	if (IS_ERR(fc))
334f485d MS	475	return PTR_ERR(fc);
d8a5ba45	476
1e9a4ed9	477	fc->flags = d.flags;
d8a5ba45	478	fc->user_id = d.user_id;
87729a55	479	fc->group_id = d.group_id;
db50b96c MS	480	fc->max_read = d.max_read;
	481	if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
	482	fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
d8a5ba45	483
d8a5ba45 MS	484	err = -ENOMEM;
	485	root = get_root_inode(sb, d.rootmode);
	486	if (root == NULL)
	487	goto err;
	488
	489	sb->s_root = d_alloc_root(root);
	490	if (!sb->s_root) {
	491	iput(root);
	492	goto err;
	493	}
334f485d	494	fuse_send_init(fc);
d8a5ba45 MS	495	return 0;
	496
	497	err:
	498	spin_lock(&fuse_lock);
d8a5ba45 MS	499	fuse_release_conn(fc);
d8a5ba45 MS	500	spin_unlock(&fuse_lock);
d8a5ba45 MS	501	return err;
	502	}
	503
	504	static struct super_block fuse_get_sb(struct file_system_type fs_type,
	505	int flags, const char *dev_name,
	506	void *raw_data)
	507	{
	508	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
	509	}
	510
	511	static struct file_system_type fuse_fs_type = {
	512	.owner = THIS_MODULE,
	513	.name = "fuse",
	514	.get_sb = fuse_get_sb,
	515	.kill_sb = kill_anon_super,
	516	};
	517
	518	static void fuse_inode_init_once(void foo, kmem_cache_t cachep,
	519	unsigned long flags)
	520	{
	521	struct inode * inode = foo;
	522
	523	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	524	SLAB_CTOR_CONSTRUCTOR)
	525	inode_init_once(inode);
	526	}
	527
	528	static int __init fuse_fs_init(void)
	529	{
	530	int err;
	531
	532	err = register_filesystem(&fuse_fs_type);
	533	if (err)
	534	printk("fuse: failed to register filesystem\n");
	535	else {
	536	fuse_inode_cachep = kmem_cache_create("fuse_inode",
	537	sizeof(struct fuse_inode),
	538	0, SLAB_HWCACHE_ALIGN,
	539	fuse_inode_init_once, NULL);
	540	if (!fuse_inode_cachep) {
	541	unregister_filesystem(&fuse_fs_type);
	542	err = -ENOMEM;
	543	}
	544	}
	545
	546	return err;
	547	}
	548
	549	static void fuse_fs_cleanup(void)
	550	{
	551	unregister_filesystem(&fuse_fs_type);
	552	kmem_cache_destroy(fuse_inode_cachep);
	553	}
	554
	555	static int __init fuse_init(void)
	556	{
	557	int res;
	558
	559	printk("fuse init (API version %i.%i)\n",
	560	FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
	561
	562	spin_lock_init(&fuse_lock);
	563	res = fuse_fs_init();
	564	if (res)
565	goto err;
566
334f485d MS	567	res = fuse_dev_init();
	568	if (res)
	569	goto err_fs_cleanup;
	570
d8a5ba45 MS	571	return 0;
d8a5ba45 MS	572
334f485d MS	573	err_fs_cleanup:
334f485d MS	574	fuse_fs_cleanup();
d8a5ba45 MS	575	err:
	576	return res;
	577	}
	578
	579	static void __exit fuse_exit(void)
	580	{
	581	printk(KERN_DEBUG "fuse exit\n");
	582
	583	fuse_fs_cleanup();
334f485d	584	fuse_dev_cleanup();
d8a5ba45 MS	585	}
	586
	587	module_init(fuse_init);
	588	module_exit(fuse_exit);