[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / f2fs / super.c

/*
 * fs/f2fs/super.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/statfs.h>
#include <linux/proc_fs.h>
#include <linux/buffer_head.h>
#include <linux/backing-dev.h>
#include <linux/kthread.h>
#include <linux/parser.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/random.h>
#include <linux/exportfs.h>
#include <linux/f2fs_fs.h>

#include "f2fs.h"
#include "node.h"
#include "xattr.h"

static struct kmem_cache *f2fs_inode_cachep;

enum {
	Opt_gc_background_off,
	Opt_disable_roll_forward,
	Opt_discard,
	Opt_noheap,
	Opt_nouser_xattr,
	Opt_noacl,
	Opt_active_logs,
	Opt_disable_ext_identify,
	Opt_err,
};

static match_table_t f2fs_tokens = {
	{Opt_gc_background_off, "background_gc_off"},
	{Opt_disable_roll_forward, "disable_roll_forward"},
	{Opt_discard, "discard"},
	{Opt_noheap, "no_heap"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_noacl, "noacl"},
	{Opt_active_logs, "active_logs=%u"},
	{Opt_disable_ext_identify, "disable_ext_identify"},
	{Opt_err, NULL},
};

void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
	va_end(args);
}

static void init_once(void *foo)
{
	struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;

	inode_init_once(&fi->vfs_inode);
}

static struct inode *f2fs_alloc_inode(struct super_block *sb)
{
	struct f2fs_inode_info *fi;

	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
	if (!fi)
		return NULL;

	init_once((void *) fi);

	/* Initilize f2fs-specific inode info */
	fi->vfs_inode.i_version = 1;
	atomic_set(&fi->dirty_dents, 0);
	fi->i_current_depth = 1;
	fi->i_advise = 0;
	rwlock_init(&fi->ext.ext_lock);

	set_inode_flag(fi, FI_NEW_INODE);

	return &fi->vfs_inode;
}

static void f2fs_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
}

static void f2fs_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, f2fs_i_callback);
}

static void f2fs_put_super(struct super_block *sb)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	f2fs_destroy_stats(sbi);
	stop_gc_thread(sbi);

	write_checkpoint(sbi, false, true);

	iput(sbi->node_inode);
	iput(sbi->meta_inode);

	/* destroy f2fs internal modules */
	destroy_node_manager(sbi);
	destroy_segment_manager(sbi);

	kfree(sbi->ckpt);

	sb->s_fs_info = NULL;
	brelse(sbi->raw_super_buf);
	kfree(sbi);
}

int f2fs_sync_fs(struct super_block *sb, int sync)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);

	if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
		return 0;

	if (sync)
		write_checkpoint(sbi, false, false);
	else
		f2fs_balance_fs(sbi);

	return 0;
}

static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct super_block *sb = dentry->d_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
	block_t total_count, user_block_count, start_count, ovp_count;

	total_count = le64_to_cpu(sbi->raw_super->block_count);
	user_block_count = sbi->user_block_count;
	start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
	ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
	buf->f_type = F2FS_SUPER_MAGIC;
	buf->f_bsize = sbi->blocksize;

	buf->f_blocks = total_count - start_count;
	buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
	buf->f_bavail = user_block_count - valid_user_blocks(sbi);

	buf->f_files = sbi->total_node_count;
	buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);

	buf->f_namelen = F2FS_MAX_NAME_LEN;
	buf->f_fsid.val[0] = (u32)id;
	buf->f_fsid.val[1] = (u32)(id >> 32);

	return 0;
}

static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
{
	struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);

	if (test_opt(sbi, BG_GC))
		seq_puts(seq, ",background_gc_on");
	else
		seq_puts(seq, ",background_gc_off");
	if (test_opt(sbi, DISABLE_ROLL_FORWARD))
		seq_puts(seq, ",disable_roll_forward");
	if (test_opt(sbi, DISCARD))
		seq_puts(seq, ",discard");
	if (test_opt(sbi, NOHEAP))
		seq_puts(seq, ",no_heap_alloc");
#ifdef CONFIG_F2FS_FS_XATTR
	if (test_opt(sbi, XATTR_USER))
		seq_puts(seq, ",user_xattr");
	else
		seq_puts(seq, ",nouser_xattr");
#endif
#ifdef CONFIG_F2FS_FS_POSIX_ACL
	if (test_opt(sbi, POSIX_ACL))
		seq_puts(seq, ",acl");
	else
		seq_puts(seq, ",noacl");
#endif
	if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
		seq_puts(seq, ",disable_ext_indentify");

	seq_printf(seq, ",active_logs=%u", sbi->active_logs);

	return 0;
}

static struct super_operations f2fs_sops = {
	.alloc_inode	= f2fs_alloc_inode,
	.destroy_inode	= f2fs_destroy_inode,
	.write_inode	= f2fs_write_inode,
	.show_options	= f2fs_show_options,
	.evict_inode	= f2fs_evict_inode,
	.put_super	= f2fs_put_super,
	.sync_fs	= f2fs_sync_fs,
	.statfs		= f2fs_statfs,
};

static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
		u64 ino, u32 generation)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;

	if (ino < F2FS_ROOT_INO(sbi))
		return ERR_PTR(-ESTALE);

	/*
	 * f2fs_iget isn't quite right if the inode is currently unallocated!
	 * However f2fs_iget currently does appropriate checks to handle stale
	 * inodes so everything is OK.
	 */
	inode = f2fs_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
		/* we didn't find the right inode.. */
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
	return inode;
}

static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    f2fs_nfs_get_inode);
}

static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
		int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    f2fs_nfs_get_inode);
}

static const struct export_operations f2fs_export_ops = {
	.fh_to_dentry = f2fs_fh_to_dentry,
	.fh_to_parent = f2fs_fh_to_parent,
	.get_parent = f2fs_get_parent,
};

static int parse_options(struct super_block *sb, struct f2fs_sb_info *sbi,
				char *options)
{
	substring_t args[MAX_OPT_ARGS];
	char *p;
	int arg = 0;

	if (!options)
		return 0;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;
		if (!*p)
			continue;
		/*
		 * Initialize args struct so we know whether arg was
		 * found; some options take optional arguments.
		 */
		args[0].to = args[0].from = NULL;
		token = match_token(p, f2fs_tokens, args);

		switch (token) {
		case Opt_gc_background_off:
			clear_opt(sbi, BG_GC);
			break;
		case Opt_disable_roll_forward:
			set_opt(sbi, DISABLE_ROLL_FORWARD);
			break;
		case Opt_discard:
			set_opt(sbi, DISCARD);
			break;
		case Opt_noheap:
			set_opt(sbi, NOHEAP);
			break;
#ifdef CONFIG_F2FS_FS_XATTR
		case Opt_nouser_xattr:
			clear_opt(sbi, XATTR_USER);
			break;
#else
		case Opt_nouser_xattr:
			f2fs_msg(sb, KERN_INFO,
				"nouser_xattr options not supported");
			break;
#endif
#ifdef CONFIG_F2FS_FS_POSIX_ACL
		case Opt_noacl:
			clear_opt(sbi, POSIX_ACL);
			break;
#else
		case Opt_noacl:
			f2fs_msg(sb, KERN_INFO, "noacl options not supported");
			break;
#endif
		case Opt_active_logs:
			if (args->from && match_int(args, &arg))
				return -EINVAL;
			if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
				return -EINVAL;
			sbi->active_logs = arg;
			break;
		case Opt_disable_ext_identify:
			set_opt(sbi, DISABLE_EXT_IDENTIFY);
			break;
		default:
			f2fs_msg(sb, KERN_ERR,
				"Unrecognized mount option \"%s\" or missing value",
				p);
			return -EINVAL;
		}
	}
	return 0;
}

static loff_t max_file_size(unsigned bits)
{
	loff_t result = ADDRS_PER_INODE;
	loff_t leaf_count = ADDRS_PER_BLOCK;

	/* two direct node blocks */
	result += (leaf_count * 2);

	/* two indirect node blocks */
	leaf_count *= NIDS_PER_BLOCK;
	result += (leaf_count * 2);

	/* one double indirect node block */
	leaf_count *= NIDS_PER_BLOCK;
	result += leaf_count;

	result <<= bits;
	return result;
}

static int sanity_check_raw_super(struct super_block *sb,
			struct f2fs_super_block *raw_super)
{
	unsigned int blocksize;

	if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
		f2fs_msg(sb, KERN_INFO,
			"Magic Mismatch, valid(0x%x) - read(0x%x)",
			F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
		return 1;
	}

	/* Currently, support only 4KB block size */
	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
	if (blocksize != PAGE_CACHE_SIZE) {
		f2fs_msg(sb, KERN_INFO,
			"Invalid blocksize (%u), supports only 4KB\n",
			blocksize);
		return 1;
	}
	if (le32_to_cpu(raw_super->log_sectorsize) !=
					F2FS_LOG_SECTOR_SIZE) {
		f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
		return 1;
	}
	if (le32_to_cpu(raw_super->log_sectors_per_block) !=
					F2FS_LOG_SECTORS_PER_BLOCK) {
		f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
		return 1;
	}
	return 0;
}

static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
				struct f2fs_checkpoint *ckpt)
{
	unsigned int total, fsmeta;

	total = le32_to_cpu(raw_super->segment_count);
	fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
	fsmeta += le32_to_cpu(raw_super->segment_count_sit);
	fsmeta += le32_to_cpu(raw_super->segment_count_nat);
	fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
	fsmeta += le32_to_cpu(raw_super->segment_count_ssa);

	if (fsmeta >= total)
		return 1;
	return 0;
}

static void init_sb_info(struct f2fs_sb_info *sbi)
{
	struct f2fs_super_block *raw_super = sbi->raw_super;
	int i;

	sbi->log_sectors_per_block =
		le32_to_cpu(raw_super->log_sectors_per_block);
	sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
	sbi->blocksize = 1 << sbi->log_blocksize;
	sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
	sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
	sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
	sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
	sbi->total_sections = le32_to_cpu(raw_super->section_count);
	sbi->total_node_count =
		(le32_to_cpu(raw_super->segment_count_nat) / 2)
			* sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
	sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
	sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
	sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);

	for (i = 0; i < NR_COUNT_TYPE; i++)
		atomic_set(&sbi->nr_pages[i], 0);
}

static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct f2fs_sb_info *sbi;
	struct f2fs_super_block *raw_super;
	struct buffer_head *raw_super_buf;
	struct inode *root;
	long err = -EINVAL;
	int i;

	/* allocate memory for f2fs-specific super block info */
	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

	/* set a block size */
	if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
		f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
		goto free_sbi;
	}

	/* read f2fs raw super block */
	raw_super_buf = sb_bread(sb, 0);
	if (!raw_super_buf) {
		err = -EIO;
		f2fs_msg(sb, KERN_ERR, "unable to read superblock");
		goto free_sbi;
	}
	raw_super = (struct f2fs_super_block *)
			((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);

	/* init some FS parameters */
	sbi->active_logs = NR_CURSEG_TYPE;

	set_opt(sbi, BG_GC);

#ifdef CONFIG_F2FS_FS_XATTR
	set_opt(sbi, XATTR_USER);
#endif
#ifdef CONFIG_F2FS_FS_POSIX_ACL
	set_opt(sbi, POSIX_ACL);
#endif
	/* parse mount options */
	if (parse_options(sb, sbi, (char *)data))
		goto free_sb_buf;

	/* sanity checking of raw super */
	if (sanity_check_raw_super(sb, raw_super)) {
		f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem");
		goto free_sb_buf;
	}

	sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
	sb->s_max_links = F2FS_LINK_MAX;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));

	sb->s_op = &f2fs_sops;
	sb->s_xattr = f2fs_xattr_handlers;
	sb->s_export_op = &f2fs_export_ops;
	sb->s_magic = F2FS_SUPER_MAGIC;
	sb->s_fs_info = sbi;
	sb->s_time_gran = 1;
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
	memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));

	/* init f2fs-specific super block info */
	sbi->sb = sb;
	sbi->raw_super = raw_super;
	sbi->raw_super_buf = raw_super_buf;
	mutex_init(&sbi->gc_mutex);
	mutex_init(&sbi->write_inode);
	mutex_init(&sbi->writepages);
	mutex_init(&sbi->cp_mutex);
	for (i = 0; i < NR_LOCK_TYPE; i++)
		mutex_init(&sbi->fs_lock[i]);
	sbi->por_doing = 0;
	spin_lock_init(&sbi->stat_lock);
	init_rwsem(&sbi->bio_sem);
	init_sb_info(sbi);

	/* get an inode for meta space */
	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
	if (IS_ERR(sbi->meta_inode)) {
		f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
		err = PTR_ERR(sbi->meta_inode);
		goto free_sb_buf;
	}

	err = get_valid_checkpoint(sbi);
	if (err) {
		f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
		goto free_meta_inode;
	}

	/* sanity checking of checkpoint */
	err = -EINVAL;
	if (sanity_check_ckpt(raw_super, sbi->ckpt)) {
		f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
		goto free_cp;
	}

	sbi->total_valid_node_count =
				le32_to_cpu(sbi->ckpt->valid_node_count);
	sbi->total_valid_inode_count =
				le32_to_cpu(sbi->ckpt->valid_inode_count);
	sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
	sbi->total_valid_block_count =
				le64_to_cpu(sbi->ckpt->valid_block_count);
	sbi->last_valid_block_count = sbi->total_valid_block_count;
	sbi->alloc_valid_block_count = 0;
	INIT_LIST_HEAD(&sbi->dir_inode_list);
	spin_lock_init(&sbi->dir_inode_lock);

	init_orphan_info(sbi);

	/* setup f2fs internal modules */
	err = build_segment_manager(sbi);
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS segment manager");
		goto free_sm;
	}
	err = build_node_manager(sbi);
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS node manager");
		goto free_nm;
	}

	build_gc_manager(sbi);

	/* get an inode for node space */
	sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
	if (IS_ERR(sbi->node_inode)) {
		f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
		err = PTR_ERR(sbi->node_inode);
		goto free_nm;
	}

	/* if there are nt orphan nodes free them */
	err = -EINVAL;
	if (recover_orphan_inodes(sbi))
		goto free_node_inode;

	/* read root inode and dentry */
	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
	if (IS_ERR(root)) {
		f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
		err = PTR_ERR(root);
		goto free_node_inode;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
		goto free_root_inode;

	sb->s_root = d_make_root(root); /* allocate root dentry */
	if (!sb->s_root) {
		err = -ENOMEM;
		goto free_root_inode;
	}

	/* recover fsynced data */
	if (!test_opt(sbi, DISABLE_ROLL_FORWARD))
		recover_fsync_data(sbi);

	/* After POR, we can run background GC thread */
	err = start_gc_thread(sbi);
	if (err)
		goto fail;

	err = f2fs_build_stats(sbi);
	if (err)
		goto fail;

	return 0;
fail:
	stop_gc_thread(sbi);
free_root_inode:
	dput(sb->s_root);
	sb->s_root = NULL;
free_node_inode:
	iput(sbi->node_inode);
free_nm:
	destroy_node_manager(sbi);
free_sm:
	destroy_segment_manager(sbi);
free_cp:
	kfree(sbi->ckpt);
free_meta_inode:
	make_bad_inode(sbi->meta_inode);
	iput(sbi->meta_inode);
free_sb_buf:
	brelse(raw_super_buf);
free_sbi:
	kfree(sbi);
	return err;
}

static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
			const char *dev_name, void *data)
{
	return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
}

static struct file_system_type f2fs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "f2fs",
	.mount		= f2fs_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static int __init init_inodecache(void)
{
	f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
			sizeof(struct f2fs_inode_info), NULL);
	if (f2fs_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(f2fs_inode_cachep);
}

static int __init init_f2fs_fs(void)
{
	int err;

	err = init_inodecache();
	if (err)
		goto fail;
	err = create_node_manager_caches();
	if (err)
		goto fail;
	err = create_gc_caches();
	if (err)
		goto fail;
	err = create_checkpoint_caches();
	if (err)
		goto fail;
	err = register_filesystem(&f2fs_fs_type);
	if (err)
		goto fail;
	f2fs_create_root_stats();
fail:
	return err;
}

static void __exit exit_f2fs_fs(void)
{
	f2fs_destroy_root_stats();
	unregister_filesystem(&f2fs_fs_type);
	destroy_checkpoint_caches();
	destroy_gc_caches();
	destroy_node_manager_caches();
	destroy_inodecache();
}

module_init(init_f2fs_fs)
module_exit(exit_f2fs_fs)

MODULE_AUTHOR("Samsung Electronics's Praesto Team");
MODULE_DESCRIPTION("Flash Friendly File System");
MODULE_LICENSE("GPL");
Commit	Line	Data
0a8165d7	1	/*
aff063e2 JK	2	* fs/f2fs/super.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/fs.h>
	14	#include <linux/statfs.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/buffer_head.h>
	17	#include <linux/backing-dev.h>
	18	#include <linux/kthread.h>
	19	#include <linux/parser.h>
	20	#include <linux/mount.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/random.h>
	23	#include <linux/exportfs.h>
	24	#include <linux/f2fs_fs.h>
	25
	26	#include "f2fs.h"
	27	#include "node.h"
	28	#include "xattr.h"
	29
	30	static struct kmem_cache *f2fs_inode_cachep;
	31
	32	enum {
	33	Opt_gc_background_off,
	34	Opt_disable_roll_forward,
	35	Opt_discard,
	36	Opt_noheap,
	37	Opt_nouser_xattr,
	38	Opt_noacl,
	39	Opt_active_logs,
	40	Opt_disable_ext_identify,
	41	Opt_err,
	42	};
	43
	44	static match_table_t f2fs_tokens = {
	45	{Opt_gc_background_off, "background_gc_off"},
	46	{Opt_disable_roll_forward, "disable_roll_forward"},
	47	{Opt_discard, "discard"},
	48	{Opt_noheap, "no_heap"},
	49	{Opt_nouser_xattr, "nouser_xattr"},
	50	{Opt_noacl, "noacl"},
	51	{Opt_active_logs, "active_logs=%u"},
	52	{Opt_disable_ext_identify, "disable_ext_identify"},
	53	{Opt_err, NULL},
	54	};
	55
a07ef784 NJ	56	void f2fs_msg(struct super_block sb, const char level, const char *fmt, ...)
	57	{
	58	struct va_format vaf;
	59	va_list args;
	60
	61	va_start(args, fmt);
	62	vaf.fmt = fmt;
	63	vaf.va = &args;
	64	printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
	65	va_end(args);
	66	}
	67
aff063e2 JK	68	static void init_once(void *foo)
	69	{
	70	struct f2fs_inode_info fi = (struct f2fs_inode_info ) foo;
	71
aff063e2 JK	72	inode_init_once(&fi->vfs_inode);
	73	}
	74
	75	static struct inode f2fs_alloc_inode(struct super_block sb)
	76	{
	77	struct f2fs_inode_info *fi;
	78
	79	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS \| __GFP_ZERO);
	80	if (!fi)
	81	return NULL;
	82
	83	init_once((void *) fi);
	84
	85	/* Initilize f2fs-specific inode info */
	86	fi->vfs_inode.i_version = 1;
	87	atomic_set(&fi->dirty_dents, 0);
	88	fi->i_current_depth = 1;
	89	fi->i_advise = 0;
	90	rwlock_init(&fi->ext.ext_lock);
	91
	92	set_inode_flag(fi, FI_NEW_INODE);
	93
	94	return &fi->vfs_inode;
	95	}
	96
	97	static void f2fs_i_callback(struct rcu_head *head)
	98	{
	99	struct inode *inode = container_of(head, struct inode, i_rcu);
	100	kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
	101	}
	102
25ca923b	103	static void f2fs_destroy_inode(struct inode *inode)
aff063e2 JK	104	{
	105	call_rcu(&inode->i_rcu, f2fs_i_callback);
	106	}
	107
	108	static void f2fs_put_super(struct super_block *sb)
	109	{
	110	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	111
	112	f2fs_destroy_stats(sbi);
	113	stop_gc_thread(sbi);
	114
	115	write_checkpoint(sbi, false, true);
	116
	117	iput(sbi->node_inode);
	118	iput(sbi->meta_inode);
	119
	120	/* destroy f2fs internal modules */
	121	destroy_node_manager(sbi);
	122	destroy_segment_manager(sbi);
	123
	124	kfree(sbi->ckpt);
	125
	126	sb->s_fs_info = NULL;
	127	brelse(sbi->raw_super_buf);
	128	kfree(sbi);
	129	}
	130
	131	int f2fs_sync_fs(struct super_block *sb, int sync)
	132	{
	133	struct f2fs_sb_info *sbi = F2FS_SB(sb);
aff063e2 JK	134
	135	if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
	136	return 0;
	137
	138	if (sync)
	139	write_checkpoint(sbi, false, false);
7d82db83 JK	140	else
7d82db83 JK	141	f2fs_balance_fs(sbi);
aff063e2	142
64c576fe	143	return 0;
aff063e2 JK	144	}
	145
	146	static int f2fs_statfs(struct dentry dentry, struct kstatfs buf)
	147	{
	148	struct super_block *sb = dentry->d_sb;
	149	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	150	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
	151	block_t total_count, user_block_count, start_count, ovp_count;
	152
	153	total_count = le64_to_cpu(sbi->raw_super->block_count);
	154	user_block_count = sbi->user_block_count;
	155	start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
	156	ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
	157	buf->f_type = F2FS_SUPER_MAGIC;
	158	buf->f_bsize = sbi->blocksize;
	159
	160	buf->f_blocks = total_count - start_count;
	161	buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
	162	buf->f_bavail = user_block_count - valid_user_blocks(sbi);
	163
1362b5e3 JK	164	buf->f_files = sbi->total_node_count;
1362b5e3 JK	165	buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
aff063e2 JK	166
	167	buf->f_namelen = F2FS_MAX_NAME_LEN;
	168	buf->f_fsid.val[0] = (u32)id;
	169	buf->f_fsid.val[1] = (u32)(id >> 32);
	170
	171	return 0;
	172	}
	173
	174	static int f2fs_show_options(struct seq_file seq, struct dentry root)
	175	{
	176	struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
	177
	178	if (test_opt(sbi, BG_GC))
	179	seq_puts(seq, ",background_gc_on");
	180	else
	181	seq_puts(seq, ",background_gc_off");
	182	if (test_opt(sbi, DISABLE_ROLL_FORWARD))
	183	seq_puts(seq, ",disable_roll_forward");
	184	if (test_opt(sbi, DISCARD))
	185	seq_puts(seq, ",discard");
	186	if (test_opt(sbi, NOHEAP))
	187	seq_puts(seq, ",no_heap_alloc");
	188	#ifdef CONFIG_F2FS_FS_XATTR
	189	if (test_opt(sbi, XATTR_USER))
	190	seq_puts(seq, ",user_xattr");
	191	else
	192	seq_puts(seq, ",nouser_xattr");
	193	#endif
	194	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	195	if (test_opt(sbi, POSIX_ACL))
	196	seq_puts(seq, ",acl");
	197	else
	198	seq_puts(seq, ",noacl");
	199	#endif
	200	if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
	201	seq_puts(seq, ",disable_ext_indentify");
	202
	203	seq_printf(seq, ",active_logs=%u", sbi->active_logs);
	204
	205	return 0;
	206	}
	207
	208	static struct super_operations f2fs_sops = {
	209	.alloc_inode = f2fs_alloc_inode,
	210	.destroy_inode = f2fs_destroy_inode,
	211	.write_inode = f2fs_write_inode,
	212	.show_options = f2fs_show_options,
	213	.evict_inode = f2fs_evict_inode,
	214	.put_super = f2fs_put_super,
	215	.sync_fs = f2fs_sync_fs,
	216	.statfs = f2fs_statfs,
	217	};
	218
	219	static struct inode f2fs_nfs_get_inode(struct super_block sb,
	220	u64 ino, u32 generation)
	221	{
	222	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	223	struct inode *inode;
	224
	225	if (ino < F2FS_ROOT_INO(sbi))
	226	return ERR_PTR(-ESTALE);
	227
	228	/*
	229	* f2fs_iget isn't quite right if the inode is currently unallocated!
230	* However f2fs_iget currently does appropriate checks to handle stale
231	* inodes so everything is OK.
232	*/
233	inode = f2fs_iget(sb, ino);
234	if (IS_ERR(inode))
235	return ERR_CAST(inode);
236	if (generation && inode->i_generation != generation) {
237	/* we didn't find the right inode.. */
238	iput(inode);
239	return ERR_PTR(-ESTALE);
240	}
241	return inode;
242	}
243
244	static struct dentry f2fs_fh_to_dentry(struct super_block sb, struct fid *fid,
245	int fh_len, int fh_type)
246	{
247	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
248	f2fs_nfs_get_inode);
249	}
250
251	static struct dentry f2fs_fh_to_parent(struct super_block sb, struct fid *fid,
252	int fh_len, int fh_type)
253	{
254	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
255	f2fs_nfs_get_inode);
256	}
257
258	static const struct export_operations f2fs_export_ops = {
259	.fh_to_dentry = f2fs_fh_to_dentry,
260	.fh_to_parent = f2fs_fh_to_parent,
261	.get_parent = f2fs_get_parent,
262	};
263
a07ef784 NJ	264	static int parse_options(struct super_block sb, struct f2fs_sb_info sbi,
a07ef784 NJ	265	char *options)
aff063e2 JK	266	{
	267	substring_t args[MAX_OPT_ARGS];
	268	char *p;
	269	int arg = 0;
	270
	271	if (!options)
	272	return 0;
	273
	274	while ((p = strsep(&options, ",")) != NULL) {
	275	int token;
	276	if (!*p)
	277	continue;
	278	/*
	279	* Initialize args struct so we know whether arg was
	280	* found; some options take optional arguments.
	281	*/
	282	args[0].to = args[0].from = NULL;
	283	token = match_token(p, f2fs_tokens, args);
	284
	285	switch (token) {
	286	case Opt_gc_background_off:
	287	clear_opt(sbi, BG_GC);
	288	break;
	289	case Opt_disable_roll_forward:
	290	set_opt(sbi, DISABLE_ROLL_FORWARD);
	291	break;
	292	case Opt_discard:
	293	set_opt(sbi, DISCARD);
	294	break;
	295	case Opt_noheap:
	296	set_opt(sbi, NOHEAP);
	297	break;
	298	#ifdef CONFIG_F2FS_FS_XATTR
	299	case Opt_nouser_xattr:
	300	clear_opt(sbi, XATTR_USER);
	301	break;
	302	#else
	303	case Opt_nouser_xattr:
a07ef784 NJ	304	f2fs_msg(sb, KERN_INFO,
a07ef784 NJ	305	"nouser_xattr options not supported");
aff063e2 JK	306	break;
	307	#endif
	308	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	309	case Opt_noacl:
	310	clear_opt(sbi, POSIX_ACL);
	311	break;
	312	#else
	313	case Opt_noacl:
a07ef784	314	f2fs_msg(sb, KERN_INFO, "noacl options not supported");
aff063e2 JK	315	break;
	316	#endif
	317	case Opt_active_logs:
	318	if (args->from && match_int(args, &arg))
	319	return -EINVAL;
12a67146	320	if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
aff063e2 JK	321	return -EINVAL;
	322	sbi->active_logs = arg;
	323	break;
	324	case Opt_disable_ext_identify:
	325	set_opt(sbi, DISABLE_EXT_IDENTIFY);
	326	break;
	327	default:
a07ef784 NJ	328	f2fs_msg(sb, KERN_ERR,
	329	"Unrecognized mount option \"%s\" or missing value",
	330	p);
aff063e2 JK	331	return -EINVAL;
	332	}
	333	}
	334	return 0;
	335	}
	336
	337	static loff_t max_file_size(unsigned bits)
	338	{
	339	loff_t result = ADDRS_PER_INODE;
	340	loff_t leaf_count = ADDRS_PER_BLOCK;
	341
	342	/* two direct node blocks */
	343	result += (leaf_count * 2);
	344
	345	/* two indirect node blocks */
	346	leaf_count *= NIDS_PER_BLOCK;
	347	result += (leaf_count * 2);
	348
	349	/* one double indirect node block */
	350	leaf_count *= NIDS_PER_BLOCK;
	351	result += leaf_count;
	352
	353	result <<= bits;
	354	return result;
	355	}
	356
a07ef784 NJ	357	static int sanity_check_raw_super(struct super_block *sb,
a07ef784 NJ	358	struct f2fs_super_block *raw_super)
aff063e2 JK	359	{
	360	unsigned int blocksize;
	361
a07ef784 NJ	362	if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
	363	f2fs_msg(sb, KERN_INFO,
	364	"Magic Mismatch, valid(0x%x) - read(0x%x)",
	365	F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
aff063e2	366	return 1;
a07ef784	367	}
aff063e2 JK	368
	369	/* Currently, support only 4KB block size */
	370	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
a07ef784 NJ	371	if (blocksize != PAGE_CACHE_SIZE) {
	372	f2fs_msg(sb, KERN_INFO,
	373	"Invalid blocksize (%u), supports only 4KB\n",
	374	blocksize);
aff063e2	375	return 1;
a07ef784	376	}
aff063e2	377	if (le32_to_cpu(raw_super->log_sectorsize) !=
a07ef784 NJ	378	F2FS_LOG_SECTOR_SIZE) {
a07ef784 NJ	379	f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
aff063e2	380	return 1;
a07ef784	381	}
aff063e2	382	if (le32_to_cpu(raw_super->log_sectors_per_block) !=
a07ef784 NJ	383	F2FS_LOG_SECTORS_PER_BLOCK) {
a07ef784 NJ	384	f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
aff063e2	385	return 1;
a07ef784	386	}
aff063e2 JK	387	return 0;
	388	}
	389
	390	static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
	391	struct f2fs_checkpoint *ckpt)
	392	{
	393	unsigned int total, fsmeta;
	394
	395	total = le32_to_cpu(raw_super->segment_count);
	396	fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
	397	fsmeta += le32_to_cpu(raw_super->segment_count_sit);
	398	fsmeta += le32_to_cpu(raw_super->segment_count_nat);
	399	fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
	400	fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
	401
	402	if (fsmeta >= total)
	403	return 1;
	404	return 0;
	405	}
	406
	407	static void init_sb_info(struct f2fs_sb_info *sbi)
	408	{
	409	struct f2fs_super_block *raw_super = sbi->raw_super;
	410	int i;
	411
	412	sbi->log_sectors_per_block =
	413	le32_to_cpu(raw_super->log_sectors_per_block);
	414	sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
	415	sbi->blocksize = 1 << sbi->log_blocksize;
	416	sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
	417	sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
	418	sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
	419	sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
	420	sbi->total_sections = le32_to_cpu(raw_super->section_count);
	421	sbi->total_node_count =
	422	(le32_to_cpu(raw_super->segment_count_nat) / 2)
	423	* sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
	424	sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
	425	sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
	426	sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
	427
	428	for (i = 0; i < NR_COUNT_TYPE; i++)
	429	atomic_set(&sbi->nr_pages[i], 0);
	430	}
	431
	432	static int f2fs_fill_super(struct super_block sb, void data, int silent)
	433	{
	434	struct f2fs_sb_info *sbi;
	435	struct f2fs_super_block *raw_super;
	436	struct buffer_head *raw_super_buf;
	437	struct inode *root;
	438	long err = -EINVAL;
	439	int i;
	440
	441	/* allocate memory for f2fs-specific super block info */
	442	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
	443	if (!sbi)
	444	return -ENOMEM;
	445
ff9234ad	446	/* set a block size */
a07ef784 NJ	447	if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
a07ef784 NJ	448	f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
aff063e2	449	goto free_sbi;
a07ef784	450	}
aff063e2 JK	451
	452	/* read f2fs raw super block */
	453	raw_super_buf = sb_bread(sb, 0);
	454	if (!raw_super_buf) {
	455	err = -EIO;
a07ef784	456	f2fs_msg(sb, KERN_ERR, "unable to read superblock");
aff063e2 JK	457	goto free_sbi;
	458	}
	459	raw_super = (struct f2fs_super_block *)
	460	((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
	461
	462	/* init some FS parameters */
	463	sbi->active_logs = NR_CURSEG_TYPE;
	464
	465	set_opt(sbi, BG_GC);
	466
	467	#ifdef CONFIG_F2FS_FS_XATTR
	468	set_opt(sbi, XATTR_USER);
	469	#endif
	470	#ifdef CONFIG_F2FS_FS_POSIX_ACL
	471	set_opt(sbi, POSIX_ACL);
	472	#endif
	473	/* parse mount options */
a07ef784	474	if (parse_options(sb, sbi, (char *)data))
aff063e2 JK	475	goto free_sb_buf;
	476
	477	/* sanity checking of raw super */
a07ef784 NJ	478	if (sanity_check_raw_super(sb, raw_super)) {
a07ef784 NJ	479	f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem");
aff063e2	480	goto free_sb_buf;
a07ef784	481	}
aff063e2	482
25ca923b	483	sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
aff063e2 JK	484	sb->s_max_links = F2FS_LINK_MAX;
	485	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	486
	487	sb->s_op = &f2fs_sops;
	488	sb->s_xattr = f2fs_xattr_handlers;
	489	sb->s_export_op = &f2fs_export_ops;
	490	sb->s_magic = F2FS_SUPER_MAGIC;
	491	sb->s_fs_info = sbi;
	492	sb->s_time_gran = 1;
	493	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) \|
	494	(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
	495	memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
	496
	497	/* init f2fs-specific super block info */
	498	sbi->sb = sb;
	499	sbi->raw_super = raw_super;
	500	sbi->raw_super_buf = raw_super_buf;
	501	mutex_init(&sbi->gc_mutex);
	502	mutex_init(&sbi->write_inode);
	503	mutex_init(&sbi->writepages);
	504	mutex_init(&sbi->cp_mutex);
	505	for (i = 0; i < NR_LOCK_TYPE; i++)
	506	mutex_init(&sbi->fs_lock[i]);
	507	sbi->por_doing = 0;
	508	spin_lock_init(&sbi->stat_lock);
	509	init_rwsem(&sbi->bio_sem);
	510	init_sb_info(sbi);
	511
	512	/* get an inode for meta space */
	513	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
	514	if (IS_ERR(sbi->meta_inode)) {
a07ef784	515	f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
aff063e2 JK	516	err = PTR_ERR(sbi->meta_inode);
	517	goto free_sb_buf;
	518	}
	519
	520	err = get_valid_checkpoint(sbi);
a07ef784 NJ	521	if (err) {
a07ef784 NJ	522	f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
aff063e2	523	goto free_meta_inode;
a07ef784	524	}
aff063e2 JK	525
	526	/* sanity checking of checkpoint */
	527	err = -EINVAL;
a07ef784 NJ	528	if (sanity_check_ckpt(raw_super, sbi->ckpt)) {
a07ef784 NJ	529	f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
aff063e2	530	goto free_cp;
a07ef784	531	}
aff063e2 JK	532
	533	sbi->total_valid_node_count =
	534	le32_to_cpu(sbi->ckpt->valid_node_count);
	535	sbi->total_valid_inode_count =
	536	le32_to_cpu(sbi->ckpt->valid_inode_count);
	537	sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
	538	sbi->total_valid_block_count =
	539	le64_to_cpu(sbi->ckpt->valid_block_count);
	540	sbi->last_valid_block_count = sbi->total_valid_block_count;
	541	sbi->alloc_valid_block_count = 0;
	542	INIT_LIST_HEAD(&sbi->dir_inode_list);
	543	spin_lock_init(&sbi->dir_inode_lock);
	544
aff063e2 JK	545	init_orphan_info(sbi);
	546
	547	/* setup f2fs internal modules */
	548	err = build_segment_manager(sbi);
a07ef784 NJ	549	if (err) {
	550	f2fs_msg(sb, KERN_ERR,
	551	"Failed to initialize F2FS segment manager");
aff063e2	552	goto free_sm;
a07ef784	553	}
aff063e2	554	err = build_node_manager(sbi);
a07ef784 NJ	555	if (err) {
	556	f2fs_msg(sb, KERN_ERR,
	557	"Failed to initialize F2FS node manager");
aff063e2	558	goto free_nm;
a07ef784	559	}
aff063e2 JK	560
	561	build_gc_manager(sbi);
	562
	563	/* get an inode for node space */
	564	sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
	565	if (IS_ERR(sbi->node_inode)) {
a07ef784	566	f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
aff063e2 JK	567	err = PTR_ERR(sbi->node_inode);
	568	goto free_nm;
	569	}
	570
	571	/* if there are nt orphan nodes free them */
	572	err = -EINVAL;
30f0c758	573	if (recover_orphan_inodes(sbi))
aff063e2 JK	574	goto free_node_inode;
	575
	576	/* read root inode and dentry */
	577	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
	578	if (IS_ERR(root)) {
a07ef784	579	f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
aff063e2 JK	580	err = PTR_ERR(root);
	581	goto free_node_inode;
	582	}
	583	if (!S_ISDIR(root->i_mode) \|\| !root->i_blocks \|\| !root->i_size)
	584	goto free_root_inode;
	585
	586	sb->s_root = d_make_root(root); /* allocate root dentry */
	587	if (!sb->s_root) {
	588	err = -ENOMEM;
	589	goto free_root_inode;
	590	}
	591
	592	/* recover fsynced data */
30f0c758	593	if (!test_opt(sbi, DISABLE_ROLL_FORWARD))
aff063e2 JK	594	recover_fsync_data(sbi);
	595
	596	/* After POR, we can run background GC thread */
	597	err = start_gc_thread(sbi);
	598	if (err)
	599	goto fail;
	600
	601	err = f2fs_build_stats(sbi);
	602	if (err)
	603	goto fail;
	604
	605	return 0;
	606	fail:
	607	stop_gc_thread(sbi);
	608	free_root_inode:
	609	dput(sb->s_root);
	610	sb->s_root = NULL;
	611	free_node_inode:
	612	iput(sbi->node_inode);
	613	free_nm:
	614	destroy_node_manager(sbi);
	615	free_sm:
	616	destroy_segment_manager(sbi);
	617	free_cp:
	618	kfree(sbi->ckpt);
	619	free_meta_inode:
	620	make_bad_inode(sbi->meta_inode);
	621	iput(sbi->meta_inode);
	622	free_sb_buf:
	623	brelse(raw_super_buf);
	624	free_sbi:
	625	kfree(sbi);
	626	return err;
	627	}
	628
	629	static struct dentry f2fs_mount(struct file_system_type fs_type, int flags,
	630	const char dev_name, void data)
	631	{
	632	return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
	633	}
	634
	635	static struct file_system_type f2fs_fs_type = {
	636	.owner = THIS_MODULE,
	637	.name = "f2fs",
	638	.mount = f2fs_mount,
	639	.kill_sb = kill_block_super,
	640	.fs_flags = FS_REQUIRES_DEV,
	641	};
	642
6e6093a8	643	static int __init init_inodecache(void)
aff063e2 JK	644	{
	645	f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
	646	sizeof(struct f2fs_inode_info), NULL);
	647	if (f2fs_inode_cachep == NULL)
	648	return -ENOMEM;
	649	return 0;
	650	}
	651
	652	static void destroy_inodecache(void)
	653	{
	654	/*
	655	* Make sure all delayed rcu free inodes are flushed before we
	656	* destroy cache.
	657	*/
	658	rcu_barrier();
	659	kmem_cache_destroy(f2fs_inode_cachep);
	660	}
	661
	662	static int __init init_f2fs_fs(void)
	663	{
	664	int err;
	665
	666	err = init_inodecache();
	667	if (err)
	668	goto fail;
	669	err = create_node_manager_caches();
	670	if (err)
	671	goto fail;
	672	err = create_gc_caches();
	673	if (err)
	674	goto fail;
	675	err = create_checkpoint_caches();
	676	if (err)
	677	goto fail;
4589d25d NJ	678	err = register_filesystem(&f2fs_fs_type);
	679	if (err)
	680	goto fail;
	681	f2fs_create_root_stats();
aff063e2 JK	682	fail:
	683	return err;
	684	}
	685
	686	static void __exit exit_f2fs_fs(void)
	687	{
4589d25d	688	f2fs_destroy_root_stats();
aff063e2 JK	689	unregister_filesystem(&f2fs_fs_type);
	690	destroy_checkpoint_caches();
	691	destroy_gc_caches();
	692	destroy_node_manager_caches();
	693	destroy_inodecache();
	694	}
	695
	696	module_init(init_f2fs_fs)
	697	module_exit(exit_f2fs_fs)
	698
	699	MODULE_AUTHOR("Samsung Electronics's Praesto Team");
	700	MODULE_DESCRIPTION("Flash Friendly File System");
	701	MODULE_LICENSE("GPL");