[thirdparty/kernel/linux.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 fd_present : 1;
	unsigned rootmode_present : 1;
	unsigned user_id_present : 1;
	unsigned group_id_present : 1;
	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
		BUG();
}

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_flags |= S_NOATIME|S_NOCMTIME;
		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->connected = 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_frsize  = attr->frsize;
	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 -EINTR;

	memset(&outarg, 0, sizeof(outarg));
	req->in.numargs = 0;
	req->in.h.opcode = FUSE_STATFS;
	req->out.numargs = 1;
	req->out.args[0].size =
		fc->minor < 4 ? FUSE_COMPAT_STATFS_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_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_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->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;
			d->fd_present = 1;
			break;

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

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

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

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

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

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

		default:
			return 0;
		}
	}

	if (!d->fd_present || !d->rootmode_present ||
	    !d->user_id_present || !d->group_id_present)
		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->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 = kzalloc(sizeof(*fc), GFP_KERNEL);
	if (fc != NULL) {
		int i;
		init_waitqueue_head(&fc->waitq);
		INIT_LIST_HEAD(&fc->pending);
		INIT_LIST_HEAD(&fc->processing);
		INIT_LIST_HEAD(&fc->io);
		INIT_LIST_HEAD(&fc->unused_list);
		INIT_LIST_HEAD(&fc->background);
		sema_init(&fc->outstanding_sem, 1); /* One for INIT */
		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;
		sb->s_fs_info = 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;
5a533682 MS	35	unsigned fd_present : 1;
	36	unsigned rootmode_present : 1;
	37	unsigned user_id_present : 1;
	38	unsigned group_id_present : 1;
1e9a4ed9	39	unsigned flags;
db50b96c	40	unsigned max_read;
d8a5ba45 MS	41	};
	42
	43	static struct inode fuse_alloc_inode(struct super_block sb)
	44	{
	45	struct inode *inode;
	46	struct fuse_inode *fi;
	47
	48	inode = kmem_cache_alloc(fuse_inode_cachep, SLAB_KERNEL);
	49	if (!inode)
	50	return NULL;
	51
	52	fi = get_fuse_inode(inode);
	53	fi->i_time = jiffies - 1;
	54	fi->nodeid = 0;
9e6268db	55	fi->nlookup = 0;
e5e5558e MS	56	fi->forget_req = fuse_request_alloc();
	57	if (!fi->forget_req) {
	58	kmem_cache_free(fuse_inode_cachep, inode);
	59	return NULL;
	60	}
d8a5ba45 MS	61
	62	return inode;
	63	}
	64
	65	static void fuse_destroy_inode(struct inode *inode)
	66	{
e5e5558e MS	67	struct fuse_inode *fi = get_fuse_inode(inode);
	68	if (fi->forget_req)
	69	fuse_request_free(fi->forget_req);
d8a5ba45 MS	70	kmem_cache_free(fuse_inode_cachep, inode);
	71	}
	72
	73	static void fuse_read_inode(struct inode *inode)
	74	{
	75	/* No op */
	76	}
	77
e5e5558e	78	void fuse_send_forget(struct fuse_conn fc, struct fuse_req req,
9e6268db	79	unsigned long nodeid, u64 nlookup)
e5e5558e MS	80	{
e5e5558e MS	81	struct fuse_forget_in *inarg = &req->misc.forget_in;
9e6268db	82	inarg->nlookup = nlookup;
e5e5558e MS	83	req->in.h.opcode = FUSE_FORGET;
	84	req->in.h.nodeid = nodeid;
	85	req->in.numargs = 1;
	86	req->in.args[0].size = sizeof(struct fuse_forget_in);
	87	req->in.args[0].value = inarg;
	88	request_send_noreply(fc, req);
	89	}
	90
d8a5ba45 MS	91	static void fuse_clear_inode(struct inode *inode)
d8a5ba45 MS	92	{
1e9a4ed9 MS	93	if (inode->i_sb->s_flags & MS_ACTIVE) {
1e9a4ed9 MS	94	struct fuse_conn *fc = get_fuse_conn(inode);
e5e5558e	95	struct fuse_inode *fi = get_fuse_inode(inode);
9e6268db	96	fuse_send_forget(fc, fi->forget_req, fi->nodeid, fi->nlookup);
e5e5558e MS	97	fi->forget_req = NULL;
e5e5558e MS	98	}
d8a5ba45 MS	99	}
	100
	101	void fuse_change_attributes(struct inode inode, struct fuse_attr attr)
	102	{
	103	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
	104	invalidate_inode_pages(inode->i_mapping);
	105
	106	inode->i_ino = attr->ino;
	107	inode->i_mode = (inode->i_mode & S_IFMT) + (attr->mode & 07777);
	108	inode->i_nlink = attr->nlink;
	109	inode->i_uid = attr->uid;
	110	inode->i_gid = attr->gid;
	111	i_size_write(inode, attr->size);
	112	inode->i_blksize = PAGE_CACHE_SIZE;
	113	inode->i_blocks = attr->blocks;
	114	inode->i_atime.tv_sec = attr->atime;
	115	inode->i_atime.tv_nsec = attr->atimensec;
	116	inode->i_mtime.tv_sec = attr->mtime;
	117	inode->i_mtime.tv_nsec = attr->mtimensec;
	118	inode->i_ctime.tv_sec = attr->ctime;
	119	inode->i_ctime.tv_nsec = attr->ctimensec;
	120	}
	121
	122	static void fuse_init_inode(struct inode inode, struct fuse_attr attr)
	123	{
	124	inode->i_mode = attr->mode & S_IFMT;
	125	i_size_write(inode, attr->size);
e5e5558e MS	126	if (S_ISREG(inode->i_mode)) {
e5e5558e MS	127	fuse_init_common(inode);
b6aeaded	128	fuse_init_file_inode(inode);
e5e5558e MS	129	} else if (S_ISDIR(inode->i_mode))
	130	fuse_init_dir(inode);
	131	else if (S_ISLNK(inode->i_mode))
	132	fuse_init_symlink(inode);
	133	else if (S_ISCHR(inode->i_mode) \|\| S_ISBLK(inode->i_mode) \|\|
	134	S_ISFIFO(inode->i_mode) \|\| S_ISSOCK(inode->i_mode)) {
	135	fuse_init_common(inode);
	136	init_special_inode(inode, inode->i_mode,
	137	new_decode_dev(attr->rdev));
39ee059a MS	138	} else
39ee059a MS	139	BUG();
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)) {
b36c31ba	172	inode->i_flags \|= S_NOATIME\|S_NOCMTIME;
d8a5ba45 MS	173	inode->i_generation = generation;
	174	inode->i_data.backing_dev_info = &fc->bdi;
	175	fuse_init_inode(inode, attr);
	176	unlock_new_inode(inode);
	177	} else if ((inode->i_mode ^ attr->mode) & S_IFMT) {
	178	BUG_ON(retried);
	179	/* Inode has changed type, any I/O on the old should fail */
	180	make_bad_inode(inode);
	181	iput(inode);
	182	retried = 1;
	183	goto retry;
	184	}
	185
9e6268db MS	186	fi = get_fuse_inode(inode);
9e6268db MS	187	fi->nlookup ++;
d8a5ba45	188	fuse_change_attributes(inode, attr);
d8a5ba45 MS	189	return inode;
	190	}
	191
	192	static void fuse_put_super(struct super_block *sb)
	193	{
	194	struct fuse_conn *fc = get_fuse_conn_super(sb);
	195
1e9a4ed9 MS	196	down_write(&fc->sbput_sem);
	197	while (!list_empty(&fc->background))
	198	fuse_release_background(list_entry(fc->background.next,
	199	struct fuse_req, bg_entry));
	200
d8a5ba45	201	spin_lock(&fuse_lock);
1e9a4ed9	202	fc->mounted = 0;
9ba7cbba	203	fc->connected = 0;
334f485d MS	204	/* Flush all readers on this fs */
334f485d MS	205	wake_up_all(&fc->waitq);
1e9a4ed9	206	up_write(&fc->sbput_sem);
d8a5ba45	207	fuse_release_conn(fc);
d8a5ba45 MS	208	spin_unlock(&fuse_lock);
	209	}
	210
e5e5558e MS	211	static void convert_fuse_statfs(struct kstatfs stbuf, struct fuse_kstatfs attr)
	212	{
	213	stbuf->f_type = FUSE_SUPER_MAGIC;
	214	stbuf->f_bsize = attr->bsize;
de5f1202	215	stbuf->f_frsize = attr->frsize;
e5e5558e MS	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)
7c352bdf	234	return -EINTR;
e5e5558e	235
de5f1202	236	memset(&outarg, 0, sizeof(outarg));
e5e5558e MS	237	req->in.numargs = 0;
	238	req->in.h.opcode = FUSE_STATFS;
	239	req->out.numargs = 1;
de5f1202 MS	240	req->out.args[0].size =
de5f1202 MS	241	fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
e5e5558e MS	242	req->out.args[0].value = &outarg;
	243	request_send(fc, req);
	244	err = req->out.h.error;
	245	if (!err)
	246	convert_fuse_statfs(buf, &outarg.st);
	247	fuse_put_request(fc, req);
	248	return err;
	249	}
	250
d8a5ba45 MS	251	enum {
	252	OPT_FD,
	253	OPT_ROOTMODE,
	254	OPT_USER_ID,
87729a55	255	OPT_GROUP_ID,
d8a5ba45 MS	256	OPT_DEFAULT_PERMISSIONS,
d8a5ba45 MS	257	OPT_ALLOW_OTHER,
db50b96c	258	OPT_MAX_READ,
d8a5ba45 MS	259	OPT_ERR
	260	};
	261
	262	static match_table_t tokens = {
	263	{OPT_FD, "fd=%u"},
	264	{OPT_ROOTMODE, "rootmode=%o"},
	265	{OPT_USER_ID, "user_id=%u"},
87729a55	266	{OPT_GROUP_ID, "group_id=%u"},
d8a5ba45 MS	267	{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
d8a5ba45 MS	268	{OPT_ALLOW_OTHER, "allow_other"},
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));
db50b96c	277	d->max_read = ~0;
d8a5ba45 MS	278
	279	while ((p = strsep(&opt, ",")) != NULL) {
	280	int token;
	281	int value;
	282	substring_t args[MAX_OPT_ARGS];
	283	if (!*p)
	284	continue;
	285
	286	token = match_token(p, tokens, args);
	287	switch (token) {
	288	case OPT_FD:
	289	if (match_int(&args[0], &value))
	290	return 0;
	291	d->fd = value;
5a533682	292	d->fd_present = 1;
d8a5ba45 MS	293	break;
	294
	295	case OPT_ROOTMODE:
	296	if (match_octal(&args[0], &value))
	297	return 0;
	298	d->rootmode = value;
5a533682	299	d->rootmode_present = 1;
d8a5ba45 MS	300	break;
	301
	302	case OPT_USER_ID:
	303	if (match_int(&args[0], &value))
	304	return 0;
	305	d->user_id = value;
5a533682	306	d->user_id_present = 1;
d8a5ba45 MS	307	break;
d8a5ba45 MS	308
87729a55 MS	309	case OPT_GROUP_ID:
	310	if (match_int(&args[0], &value))
	311	return 0;
	312	d->group_id = value;
5a533682	313	d->group_id_present = 1;
87729a55 MS	314	break;
87729a55 MS	315
1e9a4ed9 MS	316	case OPT_DEFAULT_PERMISSIONS:
	317	d->flags \|= FUSE_DEFAULT_PERMISSIONS;
	318	break;
	319
	320	case OPT_ALLOW_OTHER:
	321	d->flags \|= FUSE_ALLOW_OTHER;
	322	break;
	323
db50b96c MS	324	case OPT_MAX_READ:
	325	if (match_int(&args[0], &value))
	326	return 0;
	327	d->max_read = value;
	328	break;
	329
d8a5ba45 MS	330	default:
	331	return 0;
	332	}
	333	}
5a533682 MS	334
	335	if (!d->fd_present \|\| !d->rootmode_present \|\|
	336	!d->user_id_present \|\| !d->group_id_present)
d8a5ba45 MS	337	return 0;
	338
	339	return 1;
	340	}
	341
	342	static int fuse_show_options(struct seq_file m, struct vfsmount mnt)
	343	{
	344	struct fuse_conn *fc = get_fuse_conn_super(mnt->mnt_sb);
	345
	346	seq_printf(m, ",user_id=%u", fc->user_id);
87729a55	347	seq_printf(m, ",group_id=%u", fc->group_id);
1e9a4ed9 MS	348	if (fc->flags & FUSE_DEFAULT_PERMISSIONS)
	349	seq_puts(m, ",default_permissions");
	350	if (fc->flags & FUSE_ALLOW_OTHER)
	351	seq_puts(m, ",allow_other");
db50b96c MS	352	if (fc->max_read != ~0)
db50b96c MS	353	seq_printf(m, ",max_read=%u", fc->max_read);
d8a5ba45 MS	354	return 0;
	355	}
	356
334f485d	357	static void free_conn(struct fuse_conn *fc)
d8a5ba45	358	{
334f485d MS	359	while (!list_empty(&fc->unused_list)) {
	360	struct fuse_req *req;
	361	req = list_entry(fc->unused_list.next, struct fuse_req, list);
	362	list_del(&req->list);
	363	fuse_request_free(req);
	364	}
d8a5ba45 MS	365	kfree(fc);
	366	}
	367
334f485d MS	368	/* Must be called with the fuse lock held */
	369	void fuse_release_conn(struct fuse_conn *fc)
	370	{
1e9a4ed9 MS	371	fc->count--;
1e9a4ed9 MS	372	if (!fc->count)
334f485d MS	373	free_conn(fc);
	374	}
	375
d8a5ba45 MS	376	static struct fuse_conn *new_conn(void)
	377	{
	378	struct fuse_conn *fc;
	379
6383bdaa	380	fc = kzalloc(sizeof(*fc), GFP_KERNEL);
d8a5ba45	381	if (fc != NULL) {
334f485d	382	int i;
334f485d MS	383	init_waitqueue_head(&fc->waitq);
	384	INIT_LIST_HEAD(&fc->pending);
	385	INIT_LIST_HEAD(&fc->processing);
d77a1d5b	386	INIT_LIST_HEAD(&fc->io);
334f485d	387	INIT_LIST_HEAD(&fc->unused_list);
1e9a4ed9	388	INIT_LIST_HEAD(&fc->background);
6383bdaa	389	sema_init(&fc->outstanding_sem, 1); /* One for INIT */
1e9a4ed9	390	init_rwsem(&fc->sbput_sem);
334f485d MS	391	for (i = 0; i < FUSE_MAX_OUTSTANDING; i++) {
	392	struct fuse_req *req = fuse_request_alloc();
	393	if (!req) {
	394	free_conn(fc);
	395	return NULL;
	396	}
	397	list_add(&req->list, &fc->unused_list);
	398	}
d8a5ba45 MS	399	fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
d8a5ba45 MS	400	fc->bdi.unplug_io_fn = default_unplug_io_fn;
334f485d	401	fc->reqctr = 0;
d8a5ba45 MS	402	}
	403	return fc;
	404	}
	405
	406	static struct fuse_conn get_conn(struct file file, struct super_block *sb)
	407	{
	408	struct fuse_conn *fc;
	409
334f485d MS	410	if (file->f_op != &fuse_dev_operations)
334f485d MS	411	return ERR_PTR(-EINVAL);
d8a5ba45 MS	412	fc = new_conn();
d8a5ba45 MS	413	if (fc == NULL)
334f485d	414	return ERR_PTR(-ENOMEM);
d8a5ba45	415	spin_lock(&fuse_lock);
334f485d MS	416	if (file->private_data) {
	417	free_conn(fc);
	418	fc = ERR_PTR(-EINVAL);
	419	} else {
	420	file->private_data = fc;
6383bdaa	421	sb->s_fs_info = fc;
1e9a4ed9 MS	422	fc->mounted = 1;
	423	fc->connected = 1;
	424	fc->count = 2;
334f485d	425	}
d8a5ba45 MS	426	spin_unlock(&fuse_lock);
	427	return fc;
	428	}
	429
	430	static struct inode get_root_inode(struct super_block sb, unsigned mode)
	431	{
	432	struct fuse_attr attr;
	433	memset(&attr, 0, sizeof(attr));
	434
	435	attr.mode = mode;
	436	attr.ino = FUSE_ROOT_ID;
9e6268db	437	return fuse_iget(sb, 1, 0, &attr);
d8a5ba45 MS	438	}
	439
	440	static struct super_operations fuse_super_operations = {
	441	.alloc_inode = fuse_alloc_inode,
	442	.destroy_inode = fuse_destroy_inode,
	443	.read_inode = fuse_read_inode,
	444	.clear_inode = fuse_clear_inode,
	445	.put_super = fuse_put_super,
e5e5558e	446	.statfs = fuse_statfs,
d8a5ba45 MS	447	.show_options = fuse_show_options,
	448	};
	449
d8a5ba45 MS	450	static int fuse_fill_super(struct super_block sb, void data, int silent)
	451	{
	452	struct fuse_conn *fc;
	453	struct inode *root;
	454	struct fuse_mount_data d;
	455	struct file *file;
	456	int err;
	457
	458	if (!parse_fuse_opt((char *) data, &d))
	459	return -EINVAL;
	460
	461	sb->s_blocksize = PAGE_CACHE_SIZE;
	462	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	463	sb->s_magic = FUSE_SUPER_MAGIC;
	464	sb->s_op = &fuse_super_operations;
	465	sb->s_maxbytes = MAX_LFS_FILESIZE;
	466
	467	file = fget(d.fd);
	468	if (!file)
	469	return -EINVAL;
	470
	471	fc = get_conn(file, sb);
	472	fput(file);
334f485d MS	473	if (IS_ERR(fc))
334f485d MS	474	return PTR_ERR(fc);
d8a5ba45	475
1e9a4ed9	476	fc->flags = d.flags;
d8a5ba45	477	fc->user_id = d.user_id;
87729a55	478	fc->group_id = d.group_id;
db50b96c MS	479	fc->max_read = d.max_read;
	480	if (fc->max_read / PAGE_CACHE_SIZE < fc->bdi.ra_pages)
	481	fc->bdi.ra_pages = fc->max_read / PAGE_CACHE_SIZE;
d8a5ba45	482
d8a5ba45 MS	483	err = -ENOMEM;
	484	root = get_root_inode(sb, d.rootmode);
	485	if (root == NULL)
	486	goto err;
	487
	488	sb->s_root = d_alloc_root(root);
	489	if (!sb->s_root) {
	490	iput(root);
	491	goto err;
	492	}
334f485d	493	fuse_send_init(fc);
d8a5ba45 MS	494	return 0;
	495
	496	err:
	497	spin_lock(&fuse_lock);
d8a5ba45 MS	498	fuse_release_conn(fc);
d8a5ba45 MS	499	spin_unlock(&fuse_lock);
d8a5ba45 MS	500	return err;
	501	}
	502
	503	static struct super_block fuse_get_sb(struct file_system_type fs_type,
	504	int flags, const char *dev_name,
	505	void *raw_data)
	506	{
	507	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
	508	}
	509
	510	static struct file_system_type fuse_fs_type = {
	511	.owner = THIS_MODULE,
	512	.name = "fuse",
	513	.get_sb = fuse_get_sb,
	514	.kill_sb = kill_anon_super,
	515	};
	516
	517	static void fuse_inode_init_once(void foo, kmem_cache_t cachep,
	518	unsigned long flags)
	519	{
	520	struct inode * inode = foo;
	521
	522	if ((flags & (SLAB_CTOR_VERIFY\|SLAB_CTOR_CONSTRUCTOR)) ==
	523	SLAB_CTOR_CONSTRUCTOR)
	524	inode_init_once(inode);
	525	}
	526
	527	static int __init fuse_fs_init(void)
	528	{
	529	int err;
	530
	531	err = register_filesystem(&fuse_fs_type);
	532	if (err)
	533	printk("fuse: failed to register filesystem\n");
	534	else {
	535	fuse_inode_cachep = kmem_cache_create("fuse_inode",
	536	sizeof(struct fuse_inode),
	537	0, SLAB_HWCACHE_ALIGN,
	538	fuse_inode_init_once, NULL);
	539	if (!fuse_inode_cachep) {
	540	unregister_filesystem(&fuse_fs_type);
	541	err = -ENOMEM;
	542	}
	543	}
	544
	545	return err;
	546	}
	547
	548	static void fuse_fs_cleanup(void)
	549	{
	550	unregister_filesystem(&fuse_fs_type);
	551	kmem_cache_destroy(fuse_inode_cachep);
	552	}
	553
	554	static int __init fuse_init(void)
	555	{
	556	int res;
	557
	558	printk("fuse init (API version %i.%i)\n",
	559	FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
	560
	561	spin_lock_init(&fuse_lock);
	562	res = fuse_fs_init();
	563	if (res)
564	goto err;
565
334f485d MS	566	res = fuse_dev_init();
	567	if (res)
	568	goto err_fs_cleanup;
	569
d8a5ba45 MS	570	return 0;
d8a5ba45 MS	571
334f485d MS	572	err_fs_cleanup:
334f485d MS	573	fuse_fs_cleanup();
d8a5ba45 MS	574	err:
	575	return res;
	576	}
	577
	578	static void __exit fuse_exit(void)
	579	{
	580	printk(KERN_DEBUG "fuse exit\n");
	581
	582	fuse_fs_cleanup();
334f485d	583	fuse_dev_cleanup();
d8a5ba45 MS	584	}
	585
	586	module_init(fuse_init);
	587	module_exit(fuse_exit);