[linux-2.6-block.git] / fs / btrfs / super.c

#include <linux/module.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"

#define BTRFS_SUPER_MAGIC 0x9123682E

static struct inode_operations btrfs_dir_inode_operations;
static struct super_operations btrfs_super_ops;
static struct file_operations btrfs_dir_file_operations;

#if 0
/* some random number */

static struct super_operations ramfs_ops;

static struct backing_dev_info ramfs_backing_dev_info = {
	.ra_pages	= 0,	/* No readahead */
	.capabilities	= BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
			  BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
			  BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
};

struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
{
	struct inode * inode = new_inode(sb);

	if (inode) {
		inode->i_mode = mode;
		inode->i_uid = current->fsuid;
		inode->i_gid = current->fsgid;
		inode->i_blocks = 0;
		inode->i_mapping->a_ops = &ramfs_aops;
		inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
		inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
		switch (mode & S_IFMT) {
		default:
			init_special_inode(inode, mode, dev);
			break;
		case S_IFREG:
			inode->i_op = &ramfs_file_inode_operations;
			inode->i_fop = &ramfs_file_operations;
			break;
		case S_IFDIR:
			inode->i_op = &ramfs_dir_inode_operations;
			inode->i_fop = &simple_dir_operations;

			/* directory inodes start off with i_nlink == 2 (for "." entry) */
			inc_nlink(inode);
			break;
		case S_IFLNK:
			inode->i_op = &page_symlink_inode_operations;
			break;
		}
	}
	return inode;
}

/*
 * File creation. Allocate an inode, and we're done..
 */
/* SMP-safe */
static int
ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
{
	struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
	int error = -ENOSPC;

	if (inode) {
		if (dir->i_mode & S_ISGID) {
			inode->i_gid = dir->i_gid;
			if (S_ISDIR(mode))
				inode->i_mode |= S_ISGID;
		}
		d_instantiate(dentry, inode);
		dget(dentry);	/* Extra count - pin the dentry in core */
		error = 0;
		dir->i_mtime = dir->i_ctime = CURRENT_TIME;
	}
	return error;
}

static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
	int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
	if (!retval)
		inc_nlink(dir);
	return retval;
}

static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
	return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
}

static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
{
	struct inode *inode;
	int error = -ENOSPC;

	inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
	if (inode) {
		int l = strlen(symname)+1;
		error = page_symlink(inode, symname, l);
		if (!error) {
			if (dir->i_mode & S_ISGID)
				inode->i_gid = dir->i_gid;
			d_instantiate(dentry, inode);
			dget(dentry);
			dir->i_mtime = dir->i_ctime = CURRENT_TIME;
		} else
			iput(inode);
	}
	return error;
}

static struct inode_operations ramfs_dir_inode_operations = {
	.create		= ramfs_create,
	.lookup		= simple_lookup,
	.link		= simple_link,
	.unlink		= simple_unlink,
	.symlink	= ramfs_symlink,
	.mkdir		= ramfs_mkdir,
	.rmdir		= simple_rmdir,
	.mknod		= ramfs_mknod,
	.rename		= simple_rename,
};
#endif

static void btrfs_read_locked_inode(struct inode *inode)
{
	struct btrfs_path path;
	struct btrfs_inode_item *inode_item;
	struct btrfs_root *root = btrfs_sb(inode->i_sb);
	int ret;
	btrfs_init_path(&path);
	ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
	if (ret) {
		make_bad_inode(inode);
		return;
	}
	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
				  path.slots[0],
				  struct btrfs_inode_item);

	inode->i_mode = btrfs_inode_mode(inode_item);
	inode->i_nlink = btrfs_inode_nlink(inode_item);
	inode->i_uid = btrfs_inode_uid(inode_item);
	inode->i_gid = btrfs_inode_gid(inode_item);
	inode->i_size = btrfs_inode_size(inode_item);
	inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
	inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
	inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
	inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
	inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
	inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
	inode->i_blocks = btrfs_inode_nblocks(inode_item);
	inode->i_generation = btrfs_inode_generation(inode_item);
	btrfs_release_path(root, &path);
	switch (inode->i_mode & S_IFMT) {
#if 0
	default:
		init_special_inode(inode, inode->i_mode,
				   btrfs_inode_rdev(inode_item));
		break;
#endif
	case S_IFREG:
		break;
	case S_IFDIR:
		inode->i_op = &btrfs_dir_inode_operations;
		inode->i_fop = &btrfs_dir_file_operations;
		break;
	case S_IFLNK:
		// inode->i_op = &page_symlink_inode_operations;
		break;
	}
	return;
}

static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
			      ino_t *ino)
{
	const char *name = dentry->d_name.name;
	int namelen = dentry->d_name.len;
	struct btrfs_dir_item *di;
	struct btrfs_path path;
	struct btrfs_root *root = btrfs_sb(dir->i_sb);
	int ret;

	btrfs_init_path(&path);
	ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
				    namelen, 0);
	if (ret) {
		*ino = 0;
		goto out;
	}
	di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
			    struct btrfs_dir_item);
	*ino = btrfs_dir_objectid(di);
out:
	btrfs_release_path(root, &path);
	return ret;
}

static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
				   struct nameidata *nd)
{
	struct inode * inode;
	ino_t ino;
	int ret;

	if (dentry->d_name.len > BTRFS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	ret = btrfs_inode_by_name(dir, dentry, &ino);
	if (ret < 0)
		return ERR_PTR(ret);
	inode = NULL;
	if (ino) {
		inode = iget(dir->i_sb, ino);
		if (!inode)
			return ERR_PTR(-EACCES);
	}
	return d_splice_alias(inode, dentry);
}

static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
	struct inode *inode = filp->f_path.dentry->d_inode;
	struct btrfs_root *root = btrfs_sb(inode->i_sb);
	struct btrfs_item *item;
	struct btrfs_dir_item *di;
	struct btrfs_key key;
	struct btrfs_path path;
	int ret;
	u32 nritems;
	struct btrfs_leaf *leaf;
	int slot;
	int advance;
	unsigned char d_type = DT_UNKNOWN;
	int over;

	key.objectid = inode->i_ino;
	key.flags = 0;
	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	key.offset = filp->f_pos;
	btrfs_init_path(&path);
	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
	if (ret < 0) {
		goto err;
	}
	advance = filp->f_pos > 0 && ret != 0;
	while(1) {
		leaf = btrfs_buffer_leaf(path.nodes[0]);
		nritems = btrfs_header_nritems(&leaf->header);
		slot = path.slots[0];
		if (advance) {
			if (slot == nritems -1) {
				ret = btrfs_next_leaf(root, &path);
				if (ret)
					break;
				leaf = btrfs_buffer_leaf(path.nodes[0]);
				nritems = btrfs_header_nritems(&leaf->header);
				slot = path.slots[0];
			} else {
				slot++;
				path.slots[0]++;
			}
		}
		advance = 1;
		item = leaf->items + slot;
		if (btrfs_disk_key_objectid(&item->key) != key.objectid)
			break;
		if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
			continue;
		di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
		over = filldir(dirent, (const char *)(di + 1),
			       btrfs_dir_name_len(di),
			       btrfs_disk_key_offset(&item->key),
			       btrfs_dir_objectid(di), d_type);
		if (over)
			break;
		filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
	}
	ret = 0;
err:
	btrfs_release_path(root, &path);
	return ret;
}

static void btrfs_put_super (struct super_block * sb)
{
	struct btrfs_root *root = btrfs_sb(sb);
	int ret;

	ret = close_ctree(root);
	if (ret) {
		printk("close ctree returns %d\n", ret);
	}
	sb->s_fs_info = NULL;
}

static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
{
	struct inode * inode;
	struct dentry * root_dentry;
	struct btrfs_super_block *disk_super;
	struct buffer_head *bh;
	struct btrfs_root *root;

	sb->s_maxbytes = MAX_LFS_FILESIZE;
	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = BTRFS_SUPER_MAGIC;
	sb->s_op = &btrfs_super_ops;
	sb->s_time_gran = 1;

	bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
	if (!bh) {
		printk("btrfs: unable to read on disk super\n");
		return -EIO;
	}
	disk_super = (struct btrfs_super_block *)bh->b_data;
	root = open_ctree(sb, bh, disk_super);
	sb->s_fs_info = root;
	if (!root) {
		printk("btrfs: open_ctree failed\n");
		return -EIO;
	}
	printk("read in super total blocks %Lu root %Lu\n",
	       btrfs_super_total_blocks(disk_super),
	       btrfs_super_root_dir(disk_super));

	inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
	if (!inode)
		return -ENOMEM;
	if (inode->i_state & I_NEW) {
		btrfs_read_locked_inode(inode);
		unlock_new_inode(inode);
	}

	root_dentry = d_alloc_root(inode);
	if (!root_dentry) {
		iput(inode);
		return -ENOMEM;
	}
	sb->s_root = root_dentry;

	return 0;
}

static void fill_inode_item(struct btrfs_inode_item *item,
			    struct inode *inode)
{
	btrfs_set_inode_uid(item, inode->i_uid);
	btrfs_set_inode_gid(item, inode->i_gid);
	btrfs_set_inode_size(item, inode->i_size);
	btrfs_set_inode_mode(item, inode->i_mode);
	btrfs_set_inode_nlink(item, inode->i_nlink);
	btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
	btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
	btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
	btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
	btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
	btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
	btrfs_set_inode_nblocks(item, inode->i_blocks);
	btrfs_set_inode_generation(item, inode->i_generation);
}

static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
				     struct inode *dir, int mode)
{
	struct inode *inode;
	struct btrfs_inode_item inode_item;
	struct btrfs_root *root = btrfs_sb(dir->i_sb);
	struct btrfs_key key;
	int ret;
	u64 objectid;

	inode = new_inode(dir->i_sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
	BUG_ON(ret);

	inode->i_uid = current->fsuid;
	inode->i_gid = current->fsgid;
	inode->i_mode = mode;
	inode->i_ino = objectid;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	fill_inode_item(&inode_item, inode);


	key.objectid = objectid;
	key.flags = 0;
	key.offset = 0;
	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
	ret = btrfs_insert_inode_map(trans, root, objectid, &key);
	BUG_ON(ret);

	ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
	BUG_ON(ret);

	insert_inode_hash(inode);
	// FIXME mark_inode_dirty(inode)
	return inode;
}

static int btrfs_add_link(struct btrfs_trans_handle *trans,
			    struct dentry *dentry, struct inode *inode)
{
	int ret;
	ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
				    dentry->d_name.name, dentry->d_name.len,
				    dentry->d_parent->d_inode->i_ino,
				    inode->i_ino, 0);
	BUG_ON(ret);
	return ret;
}

static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
			    struct dentry *dentry, struct inode *inode)
{
	int err = btrfs_add_link(trans, dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	iput(inode);
	return err;
}

static int btrfs_create(struct inode *dir, struct dentry *dentry,
			int mode, struct nameidata *nd)
{
	struct btrfs_trans_handle *trans;
	struct btrfs_root *root = btrfs_sb(dir->i_sb);
	struct inode *inode;
	int err;

	trans = btrfs_start_transaction(root, 1);
	inode = btrfs_new_inode(trans, dir, mode);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		return err;
	// FIXME mark the inode dirty
	err = btrfs_add_nondir(trans, dentry, inode);
	dir->i_sb->s_dirt = 1;
	btrfs_end_transaction(trans, root);
	return err;
}

static void btrfs_write_super(struct super_block *sb)
{
	sb->s_dirt = 0;
printk("btrfs write_super!\n");
}

static int btrfs_sync_fs(struct super_block *sb, int wait)
{
	struct btrfs_trans_handle *trans;
	struct btrfs_root *root;
	int ret;

	sb->s_dirt = 0;
	return 0;

	root = btrfs_sb(sb);
	trans = btrfs_start_transaction(root, 1);
	ret = btrfs_commit_transaction(trans, root);
	sb->s_dirt = 0;
	BUG_ON(ret);
printk("btrfs sync_fs\n");
	return 0;
}

static int btrfs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_bdev(fs_type, flags, dev_name, data,
			   btrfs_fill_super, mnt);
}

static struct file_system_type btrfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "btrfs",
	.get_sb		= btrfs_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static struct super_operations btrfs_super_ops = {
	.statfs		= simple_statfs,
	.drop_inode	= generic_delete_inode,
	.put_super	= btrfs_put_super,
	.read_inode	= btrfs_read_locked_inode,
	.write_super	= btrfs_write_super,
	.sync_fs	= btrfs_sync_fs,
};

static struct inode_operations btrfs_dir_inode_operations = {
	.lookup		= btrfs_lookup,
	.create		= btrfs_create,
};

static struct file_operations btrfs_dir_file_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.readdir	= btrfs_readdir,
};


static int __init init_btrfs_fs(void)
{
	printk("btrfs loaded!\n");
	return register_filesystem(&btrfs_fs_type);
}

static void __exit exit_btrfs_fs(void)
{
	unregister_filesystem(&btrfs_fs_type);
	printk("btrfs unloaded\n");
}

module_init(init_btrfs_fs)
module_exit(exit_btrfs_fs)

MODULE_LICENSE("GPL");
Commit	Line	Data
2e635a27	1	#include <linux/module.h>
e20d96d6	2	#include <linux/buffer_head.h>
2e635a27 CM	3	#include <linux/fs.h>
	4	#include <linux/pagemap.h>
	5	#include <linux/highmem.h>
	6	#include <linux/time.h>
	7	#include <linux/init.h>
	8	#include <linux/string.h>
	9	#include <linux/smp_lock.h>
	10	#include <linux/backing-dev.h>
	11	#include "ctree.h"
e20d96d6	12	#include "disk-io.h"
d5719762	13	#include "transaction.h"
2e635a27 CM	14
2e635a27 CM	15	#define BTRFS_SUPER_MAGIC 0x9123682E
e20d96d6 CM	16
	17	static struct inode_operations btrfs_dir_inode_operations;
	18	static struct super_operations btrfs_super_ops;
	19	static struct file_operations btrfs_dir_file_operations;
	20
2e635a27 CM	21	#if 0
	22	/* some random number */
	23
	24	static struct super_operations ramfs_ops;
2e635a27 CM	25
	26	static struct backing_dev_info ramfs_backing_dev_info = {
	27	.ra_pages = 0, /* No readahead */
	28	.capabilities = BDI_CAP_NO_ACCT_DIRTY \| BDI_CAP_NO_WRITEBACK \|
	29	BDI_CAP_MAP_DIRECT \| BDI_CAP_MAP_COPY \|
	30	BDI_CAP_READ_MAP \| BDI_CAP_WRITE_MAP \| BDI_CAP_EXEC_MAP,
	31	};
	32
	33	struct inode ramfs_get_inode(struct super_block sb, int mode, dev_t dev)
	34	{
	35	struct inode * inode = new_inode(sb);
	36
	37	if (inode) {
	38	inode->i_mode = mode;
	39	inode->i_uid = current->fsuid;
	40	inode->i_gid = current->fsgid;
	41	inode->i_blocks = 0;
	42	inode->i_mapping->a_ops = &ramfs_aops;
	43	inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
	44	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	45	switch (mode & S_IFMT) {
	46	default:
	47	init_special_inode(inode, mode, dev);
	48	break;
	49	case S_IFREG:
	50	inode->i_op = &ramfs_file_inode_operations;
	51	inode->i_fop = &ramfs_file_operations;
	52	break;
	53	case S_IFDIR:
	54	inode->i_op = &ramfs_dir_inode_operations;
	55	inode->i_fop = &simple_dir_operations;
	56
	57	/* directory inodes start off with i_nlink == 2 (for "." entry) */
	58	inc_nlink(inode);
	59	break;
	60	case S_IFLNK:
	61	inode->i_op = &page_symlink_inode_operations;
	62	break;
	63	}
	64	}
	65	return inode;
	66	}
	67
	68	/*
	69	* File creation. Allocate an inode, and we're done..
	70	*/
	71	/* SMP-safe */
	72	static int
	73	ramfs_mknod(struct inode dir, struct dentry dentry, int mode, dev_t dev)
	74	{
	75	struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
	76	int error = -ENOSPC;
	77
	78	if (inode) {
	79	if (dir->i_mode & S_ISGID) {
	80	inode->i_gid = dir->i_gid;
	81	if (S_ISDIR(mode))
	82	inode->i_mode \|= S_ISGID;
	83	}
	84	d_instantiate(dentry, inode);
	85	dget(dentry); /* Extra count - pin the dentry in core */
	86	error = 0;
	87	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
	88	}
89	return error;
90	}
91
92	static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
93	{
94	int retval = ramfs_mknod(dir, dentry, mode \| S_IFDIR, 0);
95	if (!retval)
96	inc_nlink(dir);
97	return retval;
98	}
99
100	static int ramfs_create(struct inode dir, struct dentry dentry, int mode, struct nameidata *nd)
101	{
102	return ramfs_mknod(dir, dentry, mode \| S_IFREG, 0);
103	}
104
105	static int ramfs_symlink(struct inode * dir, struct dentry dentry, const char symname)
106	{
107	struct inode *inode;
108	int error = -ENOSPC;
109
110	inode = ramfs_get_inode(dir->i_sb, S_IFLNK\|S_IRWXUGO, 0);
111	if (inode) {
112	int l = strlen(symname)+1;
113	error = page_symlink(inode, symname, l);
114	if (!error) {
115	if (dir->i_mode & S_ISGID)
116	inode->i_gid = dir->i_gid;
117	d_instantiate(dentry, inode);
118	dget(dentry);
119	dir->i_mtime = dir->i_ctime = CURRENT_TIME;
120	} else
121	iput(inode);
122	}
123	return error;
124	}
125
126	static struct inode_operations ramfs_dir_inode_operations = {
127	.create = ramfs_create,
128	.lookup = simple_lookup,
129	.link = simple_link,
130	.unlink = simple_unlink,
131	.symlink = ramfs_symlink,
132	.mkdir = ramfs_mkdir,
133	.rmdir = simple_rmdir,
134	.mknod = ramfs_mknod,
135	.rename = simple_rename,
136	};
137	#endif
138
e20d96d6	139	static void btrfs_read_locked_inode(struct inode *inode)
2e635a27	140	{
e20d96d6 CM	141	struct btrfs_path path;
	142	struct btrfs_inode_item *inode_item;
	143	struct btrfs_root *root = btrfs_sb(inode->i_sb);
	144	int ret;
e20d96d6 CM	145	btrfs_init_path(&path);
	146	ret = btrfs_lookup_inode(NULL, root, &path, inode->i_ino, 0);
	147	if (ret) {
	148	make_bad_inode(inode);
	149	return;
	150	}
	151	inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
	152	path.slots[0],
	153	struct btrfs_inode_item);
2e635a27	154
e20d96d6 CM	155	inode->i_mode = btrfs_inode_mode(inode_item);
	156	inode->i_nlink = btrfs_inode_nlink(inode_item);
	157	inode->i_uid = btrfs_inode_uid(inode_item);
	158	inode->i_gid = btrfs_inode_gid(inode_item);
	159	inode->i_size = btrfs_inode_size(inode_item);
	160	inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
	161	inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
	162	inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
	163	inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
	164	inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
	165	inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
	166	inode->i_blocks = btrfs_inode_nblocks(inode_item);
	167	inode->i_generation = btrfs_inode_generation(inode_item);
e20d96d6 CM	168	btrfs_release_path(root, &path);
	169	switch (inode->i_mode & S_IFMT) {
	170	#if 0
	171	default:
	172	init_special_inode(inode, inode->i_mode,
	173	btrfs_inode_rdev(inode_item));
	174	break;
	175	#endif
	176	case S_IFREG:
e20d96d6 CM	177	break;
e20d96d6 CM	178	case S_IFDIR:
e20d96d6 CM	179	inode->i_op = &btrfs_dir_inode_operations;
	180	inode->i_fop = &btrfs_dir_file_operations;
	181	break;
	182	case S_IFLNK:
e20d96d6 CM	183	// inode->i_op = &page_symlink_inode_operations;
e20d96d6 CM	184	break;
2e635a27	185	}
e20d96d6	186	return;
2e635a27 CM	187	}
2e635a27 CM	188
e20d96d6 CM	189	static int btrfs_inode_by_name(struct inode dir, struct dentry dentry,
	190	ino_t *ino)
	191	{
	192	const char *name = dentry->d_name.name;
	193	int namelen = dentry->d_name.len;
	194	struct btrfs_dir_item *di;
	195	struct btrfs_path path;
	196	struct btrfs_root *root = btrfs_sb(dir->i_sb);
	197	int ret;
	198
	199	btrfs_init_path(&path);
	200	ret = btrfs_lookup_dir_item(NULL, root, &path, dir->i_ino, name,
	201	namelen, 0);
	202	if (ret) {
	203	*ino = 0;
	204	goto out;
	205	}
	206	di = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]), path.slots[0],
	207	struct btrfs_dir_item);
	208	*ino = btrfs_dir_objectid(di);
	209	out:
	210	btrfs_release_path(root, &path);
	211	return ret;
	212	}
	213
	214	static struct dentry btrfs_lookup(struct inode dir, struct dentry *dentry,
	215	struct nameidata *nd)
	216	{
	217	struct inode * inode;
	218	ino_t ino;
	219	int ret;
	220
	221	if (dentry->d_name.len > BTRFS_NAME_LEN)
	222	return ERR_PTR(-ENAMETOOLONG);
	223
	224	ret = btrfs_inode_by_name(dir, dentry, &ino);
	225	if (ret < 0)
	226	return ERR_PTR(ret);
	227	inode = NULL;
	228	if (ino) {
e20d96d6 CM	229	inode = iget(dir->i_sb, ino);
	230	if (!inode)
	231	return ERR_PTR(-EACCES);
	232	}
	233	return d_splice_alias(inode, dentry);
	234	}
	235
	236	static int btrfs_readdir(struct file filp, void dirent, filldir_t filldir)
	237	{
	238	struct inode *inode = filp->f_path.dentry->d_inode;
	239	struct btrfs_root *root = btrfs_sb(inode->i_sb);
	240	struct btrfs_item *item;
	241	struct btrfs_dir_item *di;
	242	struct btrfs_key key;
	243	struct btrfs_path path;
	244	int ret;
	245	u32 nritems;
	246	struct btrfs_leaf *leaf;
	247	int slot;
	248	int advance;
	249	unsigned char d_type = DT_UNKNOWN;
	250	int over;
	251
	252	key.objectid = inode->i_ino;
e20d96d6 CM	253	key.flags = 0;
	254	btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
	255	key.offset = filp->f_pos;
	256	btrfs_init_path(&path);
	257	ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
	258	if (ret < 0) {
	259	goto err;
	260	}
e20d96d6 CM	261	advance = filp->f_pos > 0 && ret != 0;
	262	while(1) {
	263	leaf = btrfs_buffer_leaf(path.nodes[0]);
	264	nritems = btrfs_header_nritems(&leaf->header);
	265	slot = path.slots[0];
e20d96d6	266	if (advance) {
e20d96d6 CM	267	if (slot == nritems -1) {
	268	ret = btrfs_next_leaf(root, &path);
	269	if (ret)
	270	break;
	271	leaf = btrfs_buffer_leaf(path.nodes[0]);
	272	nritems = btrfs_header_nritems(&leaf->header);
	273	slot = path.slots[0];
e20d96d6 CM	274	} else {
	275	slot++;
	276	path.slots[0]++;
	277	}
	278	}
	279	advance = 1;
	280	item = leaf->items + slot;
e20d96d6 CM	281	if (btrfs_disk_key_objectid(&item->key) != key.objectid)
	282	break;
	283	if (btrfs_disk_key_type(&item->key) != BTRFS_DIR_ITEM_KEY)
	284	continue;
	285	di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
e20d96d6 CM	286	over = filldir(dirent, (const char *)(di + 1),
	287	btrfs_dir_name_len(di),
	288	btrfs_disk_key_offset(&item->key),
	289	btrfs_dir_objectid(di), d_type);
	290	if (over)
	291	break;
	292	filp->f_pos = btrfs_disk_key_offset(&item->key) + 1;
	293	}
e20d96d6 CM	294	ret = 0;
	295	err:
	296	btrfs_release_path(root, &path);
	297	return ret;
	298	}
	299
	300	static void btrfs_put_super (struct super_block * sb)
	301	{
	302	struct btrfs_root *root = btrfs_sb(sb);
	303	int ret;
	304
	305	ret = close_ctree(root);
	306	if (ret) {
	307	printk("close ctree returns %d\n", ret);
	308	}
	309	sb->s_fs_info = NULL;
	310	}
2e635a27 CM	311
	312	static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
	313	{
	314	struct inode * inode;
e20d96d6 CM	315	struct dentry * root_dentry;
	316	struct btrfs_super_block *disk_super;
	317	struct buffer_head *bh;
	318	struct btrfs_root *root;
2e635a27 CM	319
	320	sb->s_maxbytes = MAX_LFS_FILESIZE;
	321	sb->s_blocksize = PAGE_CACHE_SIZE;
	322	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	323	sb->s_magic = BTRFS_SUPER_MAGIC;
e20d96d6	324	sb->s_op = &btrfs_super_ops;
2e635a27	325	sb->s_time_gran = 1;
e20d96d6 CM	326
	327	bh = sb_bread(sb, BTRFS_SUPER_INFO_OFFSET / sb->s_blocksize);
	328	if (!bh) {
	329	printk("btrfs: unable to read on disk super\n");
	330	return -EIO;
	331	}
	332	disk_super = (struct btrfs_super_block *)bh->b_data;
	333	root = open_ctree(sb, bh, disk_super);
	334	sb->s_fs_info = root;
	335	if (!root) {
	336	printk("btrfs: open_ctree failed\n");
	337	return -EIO;
	338	}
	339	printk("read in super total blocks %Lu root %Lu\n",
	340	btrfs_super_total_blocks(disk_super),
	341	btrfs_super_root_dir(disk_super));
	342
	343	inode = iget_locked(sb, btrfs_super_root_dir(disk_super));
2e635a27 CM	344	if (!inode)
2e635a27 CM	345	return -ENOMEM;
e20d96d6 CM	346	if (inode->i_state & I_NEW) {
	347	btrfs_read_locked_inode(inode);
	348	unlock_new_inode(inode);
	349	}
2e635a27	350
e20d96d6 CM	351	root_dentry = d_alloc_root(inode);
e20d96d6 CM	352	if (!root_dentry) {
2e635a27 CM	353	iput(inode);
	354	return -ENOMEM;
	355	}
e20d96d6 CM	356	sb->s_root = root_dentry;
e20d96d6 CM	357
2e635a27 CM	358	return 0;
	359	}
	360
d5719762 CM	361	static void fill_inode_item(struct btrfs_inode_item *item,
	362	struct inode *inode)
	363	{
	364	btrfs_set_inode_uid(item, inode->i_uid);
	365	btrfs_set_inode_gid(item, inode->i_gid);
	366	btrfs_set_inode_size(item, inode->i_size);
	367	btrfs_set_inode_mode(item, inode->i_mode);
	368	btrfs_set_inode_nlink(item, inode->i_nlink);
	369	btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
	370	btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
	371	btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
	372	btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
	373	btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
	374	btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
	375	btrfs_set_inode_nblocks(item, inode->i_blocks);
	376	btrfs_set_inode_generation(item, inode->i_generation);
	377	}
	378
	379	static struct inode btrfs_new_inode(struct btrfs_trans_handle trans,
	380	struct inode *dir, int mode)
	381	{
	382	struct inode *inode;
	383	struct btrfs_inode_item inode_item;
	384	struct btrfs_root *root = btrfs_sb(dir->i_sb);
	385	struct btrfs_key key;
	386	int ret;
	387	u64 objectid;
	388
	389	inode = new_inode(dir->i_sb);
	390	if (!inode)
	391	return ERR_PTR(-ENOMEM);
	392
	393	ret = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
	394	BUG_ON(ret);
	395
	396	inode->i_uid = current->fsuid;
	397	inode->i_gid = current->fsgid;
	398	inode->i_mode = mode;
	399	inode->i_ino = objectid;
	400	inode->i_blocks = 0;
	401	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	402	fill_inode_item(&inode_item, inode);
	403
	404
	405	key.objectid = objectid;
	406	key.flags = 0;
	407	key.offset = 0;
	408	btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
	409	ret = btrfs_insert_inode_map(trans, root, objectid, &key);
	410	BUG_ON(ret);
	411
	412	ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
	413	BUG_ON(ret);
	414
	415	insert_inode_hash(inode);
	416	// FIXME mark_inode_dirty(inode)
	417	return inode;
	418	}
	419
	420	static int btrfs_add_link(struct btrfs_trans_handle *trans,
	421	struct dentry dentry, struct inode inode)
	422	{
	423	int ret;
	424	ret = btrfs_insert_dir_item(trans, btrfs_sb(inode->i_sb),
425	dentry->d_name.name, dentry->d_name.len,
426	dentry->d_parent->d_inode->i_ino,
427	inode->i_ino, 0);
428	BUG_ON(ret);
429	return ret;
430	}
431
432	static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
433	struct dentry dentry, struct inode inode)
434	{
435	int err = btrfs_add_link(trans, dentry, inode);
436	if (!err) {
437	d_instantiate(dentry, inode);
438	return 0;
439	}
440	inode_dec_link_count(inode);
441	iput(inode);
442	return err;
443	}
444
445	static int btrfs_create(struct inode dir, struct dentry dentry,
446	int mode, struct nameidata *nd)
447	{
448	struct btrfs_trans_handle *trans;
449	struct btrfs_root *root = btrfs_sb(dir->i_sb);
450	struct inode *inode;
451	int err;
452
453	trans = btrfs_start_transaction(root, 1);
454	inode = btrfs_new_inode(trans, dir, mode);
455	err = PTR_ERR(inode);
456	if (IS_ERR(inode))
457	return err;
458	// FIXME mark the inode dirty
459	err = btrfs_add_nondir(trans, dentry, inode);
460	dir->i_sb->s_dirt = 1;
461	btrfs_end_transaction(trans, root);
462	return err;
463	}
464
465	static void btrfs_write_super(struct super_block *sb)
466	{
467	sb->s_dirt = 0;
468	printk("btrfs write_super!\n");
469	}
470
471	static int btrfs_sync_fs(struct super_block *sb, int wait)
472	{
473	struct btrfs_trans_handle *trans;
474	struct btrfs_root *root;
475	int ret;
df2ce34c	476
d5719762	477	sb->s_dirt = 0;
df2ce34c CM	478	return 0;
df2ce34c CM	479
d5719762 CM	480	root = btrfs_sb(sb);
	481	trans = btrfs_start_transaction(root, 1);
	482	ret = btrfs_commit_transaction(trans, root);
	483	sb->s_dirt = 0;
	484	BUG_ON(ret);
	485	printk("btrfs sync_fs\n");
	486	return 0;
	487	}
	488
2e635a27 CM	489	static int btrfs_get_sb(struct file_system_type *fs_type,
	490	int flags, const char dev_name, void data, struct vfsmount *mnt)
	491	{
	492	return get_sb_bdev(fs_type, flags, dev_name, data,
	493	btrfs_fill_super, mnt);
	494	}
	495
	496	static struct file_system_type btrfs_fs_type = {
	497	.owner = THIS_MODULE,
	498	.name = "btrfs",
	499	.get_sb = btrfs_get_sb,
	500	.kill_sb = kill_block_super,
	501	.fs_flags = FS_REQUIRES_DEV,
	502	};
	503
e20d96d6 CM	504	static struct super_operations btrfs_super_ops = {
	505	.statfs = simple_statfs,
	506	.drop_inode = generic_delete_inode,
	507	.put_super = btrfs_put_super,
	508	.read_inode = btrfs_read_locked_inode,
d5719762 CM	509	.write_super = btrfs_write_super,
d5719762 CM	510	.sync_fs = btrfs_sync_fs,
e20d96d6 CM	511	};
	512
	513	static struct inode_operations btrfs_dir_inode_operations = {
	514	.lookup = btrfs_lookup,
d5719762	515	.create = btrfs_create,
e20d96d6 CM	516	};
	517
	518	static struct file_operations btrfs_dir_file_operations = {
	519	.llseek = generic_file_llseek,
	520	.read = generic_read_dir,
	521	.readdir = btrfs_readdir,
	522	};
	523
	524
2e635a27 CM	525	static int __init init_btrfs_fs(void)
	526	{
	527	printk("btrfs loaded!\n");
	528	return register_filesystem(&btrfs_fs_type);
	529	}
	530
	531	static void __exit exit_btrfs_fs(void)
	532	{
	533	unregister_filesystem(&btrfs_fs_type);
	534	printk("btrfs unloaded\n");
	535	}
	536
	537	module_init(init_btrfs_fs)
	538	module_exit(exit_btrfs_fs)
	539
	540	MODULE_LICENSE("GPL");