[deliverable/linux.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 <linux/mpage.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "ioctl.h"
#include "print-tree.h"

#define BTRFS_SUPER_MAGIC 0x9123682E

static struct super_operations btrfs_super_ops;

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 btrfs_root *tree_root;
	struct btrfs_inode *bi;
	int err;

	sb->s_maxbytes = MAX_LFS_FILESIZE;
	sb->s_magic = BTRFS_SUPER_MAGIC;
	sb->s_op = &btrfs_super_ops;
	sb->s_time_gran = 1;

	tree_root = open_ctree(sb);

	if (!tree_root || IS_ERR(tree_root)) {
		printk("btrfs: open_ctree failed\n");
		return -EIO;
	}
	sb->s_fs_info = tree_root;
	disk_super = tree_root->fs_info->disk_super;
	inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
				  tree_root);
	bi = BTRFS_I(inode);
	bi->location.objectid = inode->i_ino;
	bi->location.offset = 0;
	bi->location.flags = 0;
	bi->root = tree_root;
	btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);

	if (!inode) {
		err = -ENOMEM;
		goto fail_close;
	}
	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);
		err = -ENOMEM;
		goto fail_close;
	}
	sb->s_root = root_dentry;
	btrfs_transaction_queue_work(tree_root, HZ * 30);
	return 0;

fail_close:
	close_ctree(tree_root);
	return err;
}

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

	sb->s_dirt = 0;
	if (!wait) {
		filemap_flush(root->fs_info->btree_inode->i_mapping);
		return 0;
	}
	mutex_lock(&root->fs_info->fs_mutex);
	trans = btrfs_start_transaction(root, 1);
	ret = btrfs_commit_transaction(trans, root);
	sb->s_dirt = 0;
	BUG_ON(ret);
	mutex_unlock(&root->fs_info->fs_mutex);
	return 0;
}

static void btrfs_write_super(struct super_block *sb)
{
	sb->s_dirt = 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 int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct btrfs_root *root = btrfs_sb(dentry->d_sb);
	struct btrfs_super_block *disk_super = root->fs_info->disk_super;

	buf->f_namelen = BTRFS_NAME_LEN;
	buf->f_blocks = btrfs_super_total_blocks(disk_super);
	buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
	buf->f_bavail = buf->f_bfree;
	buf->f_bsize = dentry->d_sb->s_blocksize;
	buf->f_type = BTRFS_SUPER_MAGIC;
	return 0;
}

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 = {
	.delete_inode	= btrfs_delete_inode,
	.put_super	= btrfs_put_super,
	.read_inode	= btrfs_read_locked_inode,
	.write_super	= btrfs_write_super,
	.sync_fs	= btrfs_sync_fs,
	.write_inode	= btrfs_write_inode,
	.dirty_inode	= btrfs_dirty_inode,
	.alloc_inode	= btrfs_alloc_inode,
	.destroy_inode	= btrfs_destroy_inode,
	.statfs		= btrfs_statfs,
};

static int __init init_btrfs_fs(void)
{
	int err;
	btrfs_init_transaction_sys();
	err = btrfs_init_cachep();
	if (err)
		return err;
	return register_filesystem(&btrfs_fs_type);
}

static void __exit exit_btrfs_fs(void)
{
	btrfs_exit_transaction_sys();
	btrfs_destroy_cachep();
	unregister_filesystem(&btrfs_fs_type);
}

module_init(init_btrfs_fs)
module_exit(exit_btrfs_fs)

MODULE_LICENSE("GPL");
Commit	Line	Data
	1	#include <linux/module.h>
	2	#include <linux/buffer_head.h>
	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 <linux/mpage.h>
	12	#include <linux/swap.h>
	13	#include <linux/writeback.h>
	14	#include <linux/statfs.h>
	15	#include <linux/compat.h>
	16	#include "ctree.h"
	17	#include "disk-io.h"
	18	#include "transaction.h"
	19	#include "btrfs_inode.h"
	20	#include "ioctl.h"
	21	#include "print-tree.h"
	22
	23	#define BTRFS_SUPER_MAGIC 0x9123682E
	24
	25	static struct super_operations btrfs_super_ops;
	26
	27	static void btrfs_put_super (struct super_block * sb)
	28	{
	29	struct btrfs_root *root = btrfs_sb(sb);
	30	int ret;
	31
	32	ret = close_ctree(root);
	33	if (ret) {
	34	printk("close ctree returns %d\n", ret);
	35	}
	36	sb->s_fs_info = NULL;
	37	}
	38
	39	static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
	40	{
	41	struct inode * inode;
	42	struct dentry * root_dentry;
	43	struct btrfs_super_block *disk_super;
	44	struct btrfs_root *tree_root;
	45	struct btrfs_inode *bi;
	46	int err;
	47
	48	sb->s_maxbytes = MAX_LFS_FILESIZE;
	49	sb->s_magic = BTRFS_SUPER_MAGIC;
	50	sb->s_op = &btrfs_super_ops;
	51	sb->s_time_gran = 1;
	52
	53	tree_root = open_ctree(sb);
	54
	55	if (!tree_root \|\| IS_ERR(tree_root)) {
	56	printk("btrfs: open_ctree failed\n");
	57	return -EIO;
	58	}
	59	sb->s_fs_info = tree_root;
	60	disk_super = tree_root->fs_info->disk_super;
	61	inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super),
	62	tree_root);
	63	bi = BTRFS_I(inode);
	64	bi->location.objectid = inode->i_ino;
	65	bi->location.offset = 0;
	66	bi->location.flags = 0;
	67	bi->root = tree_root;
	68	btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
	69
	70	if (!inode) {
	71	err = -ENOMEM;
	72	goto fail_close;
	73	}
	74	if (inode->i_state & I_NEW) {
	75	btrfs_read_locked_inode(inode);
	76	unlock_new_inode(inode);
	77	}
	78
	79	root_dentry = d_alloc_root(inode);
	80	if (!root_dentry) {
	81	iput(inode);
	82	err = -ENOMEM;
	83	goto fail_close;
	84	}
	85	sb->s_root = root_dentry;
	86	btrfs_transaction_queue_work(tree_root, HZ * 30);
	87	return 0;
	88
	89	fail_close:
	90	close_ctree(tree_root);
	91	return err;
	92	}
	93
	94	static int btrfs_sync_fs(struct super_block *sb, int wait)
	95	{
	96	struct btrfs_trans_handle *trans;
	97	struct btrfs_root *root;
	98	int ret;
	99	root = btrfs_sb(sb);
	100
	101	sb->s_dirt = 0;
	102	if (!wait) {
	103	filemap_flush(root->fs_info->btree_inode->i_mapping);
	104	return 0;
	105	}
	106	mutex_lock(&root->fs_info->fs_mutex);
	107	trans = btrfs_start_transaction(root, 1);
	108	ret = btrfs_commit_transaction(trans, root);
	109	sb->s_dirt = 0;
	110	BUG_ON(ret);
	111	mutex_unlock(&root->fs_info->fs_mutex);
	112	return 0;
	113	}
	114
	115	static void btrfs_write_super(struct super_block *sb)
	116	{
	117	sb->s_dirt = 0;
	118	}
	119
	120	static int btrfs_get_sb(struct file_system_type *fs_type,
	121	int flags, const char dev_name, void data, struct vfsmount *mnt)
	122	{
	123	return get_sb_bdev(fs_type, flags, dev_name, data,
	124	btrfs_fill_super, mnt);
	125	}
	126
	127	static int btrfs_statfs(struct dentry dentry, struct kstatfs buf)
	128	{
	129	struct btrfs_root *root = btrfs_sb(dentry->d_sb);
	130	struct btrfs_super_block *disk_super = root->fs_info->disk_super;
	131
	132	buf->f_namelen = BTRFS_NAME_LEN;
	133	buf->f_blocks = btrfs_super_total_blocks(disk_super);
	134	buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super);
	135	buf->f_bavail = buf->f_bfree;
	136	buf->f_bsize = dentry->d_sb->s_blocksize;
	137	buf->f_type = BTRFS_SUPER_MAGIC;
	138	return 0;
	139	}
	140
	141	static struct file_system_type btrfs_fs_type = {
	142	.owner = THIS_MODULE,
	143	.name = "btrfs",
	144	.get_sb = btrfs_get_sb,
	145	.kill_sb = kill_block_super,
	146	.fs_flags = FS_REQUIRES_DEV,
	147	};
	148
	149	static struct super_operations btrfs_super_ops = {
	150	.delete_inode = btrfs_delete_inode,
	151	.put_super = btrfs_put_super,
	152	.read_inode = btrfs_read_locked_inode,
	153	.write_super = btrfs_write_super,
	154	.sync_fs = btrfs_sync_fs,
	155	.write_inode = btrfs_write_inode,
	156	.dirty_inode = btrfs_dirty_inode,
	157	.alloc_inode = btrfs_alloc_inode,
	158	.destroy_inode = btrfs_destroy_inode,
	159	.statfs = btrfs_statfs,
	160	};
	161
	162	static int __init init_btrfs_fs(void)
	163	{
	164	int err;
	165	btrfs_init_transaction_sys();
	166	err = btrfs_init_cachep();
	167	if (err)
	168	return err;
	169	return register_filesystem(&btrfs_fs_type);
	170	}
	171
	172	static void __exit exit_btrfs_fs(void)
	173	{
	174	btrfs_exit_transaction_sys();
	175	btrfs_destroy_cachep();
	176	unregister_filesystem(&btrfs_fs_type);
	177	}
	178
	179	module_init(init_btrfs_fs)
	180	module_exit(exit_btrfs_fs)
	181
	182	MODULE_LICENSE("GPL");