super.c 36.2 KB
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/*
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 * 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/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>
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#include <linux/proc_fs.h>
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#include <linux/random.h>
#include <linux/exportfs.h>
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#include <linux/blkdev.h>
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#include <linux/f2fs_fs.h>
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#include <linux/sysfs.h>
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#include "f2fs.h"
#include "node.h"
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#include "segment.h"
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#include "xattr.h"
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#include "gc.h"
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#include "trace.h"
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#define CREATE_TRACE_POINTS
#include <trace/events/f2fs.h>

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static struct proc_dir_entry *f2fs_proc_root;
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static struct kmem_cache *f2fs_inode_cachep;
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static struct kset *f2fs_kset;
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/* f2fs-wide shrinker description */
static struct shrinker f2fs_shrinker_info = {
	.scan_objects = f2fs_shrink_scan,
	.count_objects = f2fs_shrink_count,
	.seeks = DEFAULT_SEEKS,
};

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enum {
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	Opt_gc_background,
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	Opt_disable_roll_forward,
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	Opt_norecovery,
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	Opt_discard,
	Opt_noheap,
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	Opt_user_xattr,
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	Opt_nouser_xattr,
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	Opt_acl,
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	Opt_noacl,
	Opt_active_logs,
	Opt_disable_ext_identify,
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	Opt_inline_xattr,
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	Opt_inline_data,
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	Opt_inline_dentry,
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	Opt_flush_merge,
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	Opt_nobarrier,
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	Opt_fastboot,
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	Opt_extent_cache,
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	Opt_noextent_cache,
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	Opt_noinline_data,
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	Opt_err,
};

static match_table_t f2fs_tokens = {
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	{Opt_gc_background, "background_gc=%s"},
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	{Opt_disable_roll_forward, "disable_roll_forward"},
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	{Opt_norecovery, "norecovery"},
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	{Opt_discard, "discard"},
	{Opt_noheap, "no_heap"},
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	{Opt_user_xattr, "user_xattr"},
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	{Opt_nouser_xattr, "nouser_xattr"},
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	{Opt_acl, "acl"},
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	{Opt_noacl, "noacl"},
	{Opt_active_logs, "active_logs=%u"},
	{Opt_disable_ext_identify, "disable_ext_identify"},
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	{Opt_inline_xattr, "inline_xattr"},
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	{Opt_inline_data, "inline_data"},
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	{Opt_inline_dentry, "inline_dentry"},
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	{Opt_flush_merge, "flush_merge"},
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	{Opt_nobarrier, "nobarrier"},
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	{Opt_fastboot, "fastboot"},
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	{Opt_extent_cache, "extent_cache"},
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	{Opt_noextent_cache, "noextent_cache"},
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	{Opt_noinline_data, "noinline_data"},
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	{Opt_err, NULL},
};

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/* Sysfs support for f2fs */
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enum {
	GC_THREAD,	/* struct f2fs_gc_thread */
	SM_INFO,	/* struct f2fs_sm_info */
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	NM_INFO,	/* struct f2fs_nm_info */
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	F2FS_SBI,	/* struct f2fs_sb_info */
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};

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struct f2fs_attr {
	struct attribute attr;
	ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
	ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
			 const char *, size_t);
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	int struct_type;
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	int offset;
};

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static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
{
	if (struct_type == GC_THREAD)
		return (unsigned char *)sbi->gc_thread;
	else if (struct_type == SM_INFO)
		return (unsigned char *)SM_I(sbi);
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	else if (struct_type == NM_INFO)
		return (unsigned char *)NM_I(sbi);
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	else if (struct_type == F2FS_SBI)
		return (unsigned char *)sbi;
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	return NULL;
}

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static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
			struct f2fs_sb_info *sbi, char *buf)
{
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	unsigned char *ptr = NULL;
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	unsigned int *ui;

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	ptr = __struct_ptr(sbi, a->struct_type);
	if (!ptr)
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		return -EINVAL;

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	ui = (unsigned int *)(ptr + a->offset);
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	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
}

static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
			struct f2fs_sb_info *sbi,
			const char *buf, size_t count)
{
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	unsigned char *ptr;
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	unsigned long t;
	unsigned int *ui;
	ssize_t ret;

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	ptr = __struct_ptr(sbi, a->struct_type);
	if (!ptr)
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		return -EINVAL;

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	ui = (unsigned int *)(ptr + a->offset);
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	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret < 0)
		return ret;
	*ui = t;
	return count;
}

static ssize_t f2fs_attr_show(struct kobject *kobj,
				struct attribute *attr, char *buf)
{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
								s_kobj);
	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

	return a->show ? a->show(a, sbi, buf) : 0;
}

static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
						const char *buf, size_t len)
{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
									s_kobj);
	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

	return a->store ? a->store(a, sbi, buf, len) : 0;
}

static void f2fs_sb_release(struct kobject *kobj)
{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
								s_kobj);
	complete(&sbi->s_kobj_unregister);
}

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#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
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static struct f2fs_attr f2fs_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show	= _show,					\
	.store	= _store,					\
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	.struct_type = _struct_type,				\
	.offset = _offset					\
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}

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#define F2FS_RW_ATTR(struct_type, struct_name, name, elname)	\
	F2FS_ATTR_OFFSET(struct_type, name, 0644,		\
		f2fs_sbi_show, f2fs_sbi_store,			\
		offsetof(struct struct_name, elname))
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F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
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F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
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F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
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#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
static struct attribute *f2fs_attrs[] = {
	ATTR_LIST(gc_min_sleep_time),
	ATTR_LIST(gc_max_sleep_time),
	ATTR_LIST(gc_no_gc_sleep_time),
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	ATTR_LIST(gc_idle),
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	ATTR_LIST(reclaim_segments),
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	ATTR_LIST(max_small_discards),
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	ATTR_LIST(batched_trim_sections),
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	ATTR_LIST(ipu_policy),
	ATTR_LIST(min_ipu_util),
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	ATTR_LIST(min_fsync_blocks),
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	ATTR_LIST(max_victim_search),
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	ATTR_LIST(dir_level),
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	ATTR_LIST(ram_thresh),
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	NULL,
};

static const struct sysfs_ops f2fs_attr_ops = {
	.show	= f2fs_attr_show,
	.store	= f2fs_attr_store,
};

static struct kobj_type f2fs_ktype = {
	.default_attrs	= f2fs_attrs,
	.sysfs_ops	= &f2fs_attr_ops,
	.release	= f2fs_sb_release,
};

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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);
}

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

	inode_init_once(&fi->vfs_inode);
}

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static int parse_options(struct super_block *sb, char *options)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
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	struct request_queue *q;
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	substring_t args[MAX_OPT_ARGS];
	char *p, *name;
	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:
			name = match_strdup(&args[0]);

			if (!name)
				return -ENOMEM;
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			if (strlen(name) == 2 && !strncmp(name, "on", 2))
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				set_opt(sbi, BG_GC);
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			else if (strlen(name) == 3 && !strncmp(name, "off", 3))
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				clear_opt(sbi, BG_GC);
			else {
				kfree(name);
				return -EINVAL;
			}
			kfree(name);
			break;
		case Opt_disable_roll_forward:
			set_opt(sbi, DISABLE_ROLL_FORWARD);
			break;
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		case Opt_norecovery:
			/* this option mounts f2fs with ro */
			set_opt(sbi, DISABLE_ROLL_FORWARD);
			if (!f2fs_readonly(sb))
				return -EINVAL;
			break;
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		case Opt_discard:
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			q = bdev_get_queue(sb->s_bdev);
			if (blk_queue_discard(q)) {
				set_opt(sbi, DISCARD);
			} else {
				f2fs_msg(sb, KERN_WARNING,
					"mounting with \"discard\" option, but "
					"the device does not support discard");
			}
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			break;
		case Opt_noheap:
			set_opt(sbi, NOHEAP);
			break;
#ifdef CONFIG_F2FS_FS_XATTR
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		case Opt_user_xattr:
			set_opt(sbi, XATTR_USER);
			break;
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		case Opt_nouser_xattr:
			clear_opt(sbi, XATTR_USER);
			break;
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		case Opt_inline_xattr:
			set_opt(sbi, INLINE_XATTR);
			break;
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#else
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		case Opt_user_xattr:
			f2fs_msg(sb, KERN_INFO,
				"user_xattr options not supported");
			break;
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		case Opt_nouser_xattr:
			f2fs_msg(sb, KERN_INFO,
				"nouser_xattr options not supported");
			break;
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		case Opt_inline_xattr:
			f2fs_msg(sb, KERN_INFO,
				"inline_xattr options not supported");
			break;
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#endif
#ifdef CONFIG_F2FS_FS_POSIX_ACL
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		case Opt_acl:
			set_opt(sbi, POSIX_ACL);
			break;
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		case Opt_noacl:
			clear_opt(sbi, POSIX_ACL);
			break;
#else
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		case Opt_acl:
			f2fs_msg(sb, KERN_INFO, "acl options not supported");
			break;
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		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;
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		case Opt_inline_data:
			set_opt(sbi, INLINE_DATA);
			break;
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		case Opt_inline_dentry:
			set_opt(sbi, INLINE_DENTRY);
			break;
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		case Opt_flush_merge:
			set_opt(sbi, FLUSH_MERGE);
			break;
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		case Opt_nobarrier:
			set_opt(sbi, NOBARRIER);
			break;
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		case Opt_fastboot:
			set_opt(sbi, FASTBOOT);
			break;
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		case Opt_extent_cache:
			set_opt(sbi, EXTENT_CACHE);
			break;
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		case Opt_noextent_cache:
			clear_opt(sbi, EXTENT_CACHE);
			break;
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		case Opt_noinline_data:
			clear_opt(sbi, INLINE_DATA);
			break;
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		default:
			f2fs_msg(sb, KERN_ERR,
				"Unrecognized mount option \"%s\" or missing value",
				p);
			return -EINVAL;
		}
	}
	return 0;
}

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

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	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
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	if (!fi)
		return NULL;

	init_once((void *) fi);

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	/* Initialize f2fs-specific inode info */
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	fi->vfs_inode.i_version = 1;
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	atomic_set(&fi->dirty_pages, 0);
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	fi->i_current_depth = 1;
	fi->i_advise = 0;
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	rwlock_init(&fi->ext_lock);
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	init_rwsem(&fi->i_sem);
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	INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
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	INIT_LIST_HEAD(&fi->inmem_pages);
	mutex_init(&fi->inmem_lock);
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	set_inode_flag(fi, FI_NEW_INODE);

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	if (test_opt(F2FS_SB(sb), INLINE_XATTR))
		set_inode_flag(fi, FI_INLINE_XATTR);

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	/* Will be used by directory only */
	fi->i_dir_level = F2FS_SB(sb)->dir_level;

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#ifdef CONFIG_F2FS_FS_ENCRYPTION
	fi->i_crypt_info = NULL;
#endif
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	return &fi->vfs_inode;
}

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static int f2fs_drop_inode(struct inode *inode)
{
	/*
	 * This is to avoid a deadlock condition like below.
	 * writeback_single_inode(inode)
	 *  - f2fs_write_data_page
	 *    - f2fs_gc -> iput -> evict
	 *       - inode_wait_for_writeback(inode)
	 */
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	if (!inode_unhashed(inode) && inode->i_state & I_SYNC) {
		if (!inode->i_nlink && !is_bad_inode(inode)) {
			spin_unlock(&inode->i_lock);

			/* some remained atomic pages should discarded */
			if (f2fs_is_atomic_file(inode))
				commit_inmem_pages(inode, true);

			sb_start_intwrite(inode->i_sb);
			i_size_write(inode, 0);

			if (F2FS_HAS_BLOCKS(inode))
				f2fs_truncate(inode);

			sb_end_intwrite(inode->i_sb);

#ifdef CONFIG_F2FS_FS_ENCRYPTION
			if (F2FS_I(inode)->i_crypt_info)
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				f2fs_free_encryption_info(inode,
					F2FS_I(inode)->i_crypt_info);
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#endif
			spin_lock(&inode->i_lock);
		}
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		return 0;
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	}
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	return generic_drop_inode(inode);
}

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/*
 * f2fs_dirty_inode() is called from __mark_inode_dirty()
 *
 * We should call set_dirty_inode to write the dirty inode through write_inode.
 */
static void f2fs_dirty_inode(struct inode *inode, int flags)
{
	set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
}

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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));
}

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static void f2fs_destroy_inode(struct inode *inode)
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{
	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);

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	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
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	kobject_del(&sbi->s_kobj);
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	stop_gc_thread(sbi);

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	/* prevent remaining shrinker jobs */
	mutex_lock(&sbi->umount_mutex);

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	/*
	 * We don't need to do checkpoint when superblock is clean.
	 * But, the previous checkpoint was not done by umount, it needs to do
	 * clean checkpoint again.
	 */
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	if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
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			!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
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		struct cp_control cpc = {
			.reason = CP_UMOUNT,
		};
		write_checkpoint(sbi, &cpc);
	}
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	/* write_checkpoint can update stat informaion */
	f2fs_destroy_stats(sbi);

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	/*
	 * normally superblock is clean, so we need to release this.
	 * In addition, EIO will skip do checkpoint, we need this as well.
	 */
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	release_dirty_inode(sbi);
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	release_discard_addrs(sbi);
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	f2fs_leave_shrinker(sbi);
	mutex_unlock(&sbi->umount_mutex);

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

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

	kfree(sbi->ckpt);
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	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
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	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);

564 565
	trace_f2fs_sync_fs(sb, sync);

566
	if (sync) {
567 568
		struct cp_control cpc;

569 570
		cpc.reason = __get_cp_reason(sbi);

571
		mutex_lock(&sbi->gc_mutex);
572
		write_checkpoint(sbi, &cpc);
573 574
		mutex_unlock(&sbi->gc_mutex);
	} else {
575
		f2fs_balance_fs(sbi);
576
	}
577
	f2fs_trace_ios(NULL, 1);
J
Jaegeuk Kim 已提交
578

579
	return 0;
J
Jaegeuk Kim 已提交
580 581
}

582 583 584 585
static int f2fs_freeze(struct super_block *sb)
{
	int err;

J
Jaegeuk Kim 已提交
586
	if (f2fs_readonly(sb))
587 588 589 590 591 592 593 594 595 596 597
		return 0;

	err = f2fs_sync_fs(sb, 1);
	return err;
}

static int f2fs_unfreeze(struct super_block *sb)
{
	return 0;
}

J
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598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615
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);

616 617
	buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
	buf->f_ffree = buf->f_files - valid_inode_count(sbi);
J
Jaegeuk Kim 已提交
618

619
	buf->f_namelen = F2FS_NAME_LEN;
J
Jaegeuk Kim 已提交
620 621 622 623 624 625 626 627 628 629
	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);

630
	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
631
		seq_printf(seq, ",background_gc=%s", "on");
J
Jaegeuk Kim 已提交
632
	else
633
		seq_printf(seq, ",background_gc=%s", "off");
J
Jaegeuk Kim 已提交
634 635 636 637 638 639 640 641 642 643 644
	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");
J
Jaegeuk Kim 已提交
645 646
	if (test_opt(sbi, INLINE_XATTR))
		seq_puts(seq, ",inline_xattr");
J
Jaegeuk Kim 已提交
647 648 649 650 651 652 653 654
#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))
655
		seq_puts(seq, ",disable_ext_identify");
656 657
	if (test_opt(sbi, INLINE_DATA))
		seq_puts(seq, ",inline_data");
W
Wanpeng Li 已提交
658 659
	else
		seq_puts(seq, ",noinline_data");
660 661
	if (test_opt(sbi, INLINE_DENTRY))
		seq_puts(seq, ",inline_dentry");
662
	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
663
		seq_puts(seq, ",flush_merge");
J
Jaegeuk Kim 已提交
664 665
	if (test_opt(sbi, NOBARRIER))
		seq_puts(seq, ",nobarrier");
666 667
	if (test_opt(sbi, FASTBOOT))
		seq_puts(seq, ",fastboot");
668 669
	if (test_opt(sbi, EXTENT_CACHE))
		seq_puts(seq, ",extent_cache");
670 671
	else
		seq_puts(seq, ",noextent_cache");
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672 673 674 675 676
	seq_printf(seq, ",active_logs=%u", sbi->active_logs);

	return 0;
}

677 678 679 680
static int segment_info_seq_show(struct seq_file *seq, void *offset)
{
	struct super_block *sb = seq->private;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
C
Chris Fries 已提交
681 682
	unsigned int total_segs =
			le32_to_cpu(sbi->raw_super->segment_count_main);
683 684
	int i;

685 686 687
	seq_puts(seq, "format: segment_type|valid_blocks\n"
		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

688
	for (i = 0; i < total_segs; i++) {
689 690 691 692 693 694
		struct seg_entry *se = get_seg_entry(sbi, i);

		if ((i % 10) == 0)
			seq_printf(seq, "%-5d", i);
		seq_printf(seq, "%d|%-3u", se->type,
					get_valid_blocks(sbi, i, 1));
695 696
		if ((i % 10) == 9 || i == (total_segs - 1))
			seq_putc(seq, '\n');
697
		else
698
			seq_putc(seq, ' ');
699
	}
700

701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716
	return 0;
}

static int segment_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, segment_info_seq_show, PDE_DATA(inode));
}

static const struct file_operations f2fs_seq_segment_info_fops = {
	.owner = THIS_MODULE,
	.open = segment_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
static void default_options(struct f2fs_sb_info *sbi)
{
	/* init some FS parameters */
	sbi->active_logs = NR_CURSEG_TYPE;

	set_opt(sbi, BG_GC);
	set_opt(sbi, INLINE_DATA);

#ifdef CONFIG_F2FS_FS_XATTR
	set_opt(sbi, XATTR_USER);
#endif
#ifdef CONFIG_F2FS_FS_POSIX_ACL
	set_opt(sbi, POSIX_ACL);
#endif
}

733 734 735 736 737
static int f2fs_remount(struct super_block *sb, int *flags, char *data)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct f2fs_mount_info org_mount_opt;
	int err, active_logs;
738 739
	bool need_restart_gc = false;
	bool need_stop_gc = false;
740

741 742
	sync_filesystem(sb);

743 744 745 746 747 748 749
	/*
	 * Save the old mount options in case we
	 * need to restore them.
	 */
	org_mount_opt = sbi->mount_opt;
	active_logs = sbi->active_logs;

750
	sbi->mount_opt.opt = 0;
751
	default_options(sbi);
752

753 754 755 756 757 758 759
	/* parse mount options */
	err = parse_options(sb, data);
	if (err)
		goto restore_opts;

	/*
	 * Previous and new state of filesystem is RO,
760
	 * so skip checking GC and FLUSH_MERGE conditions.
761
	 */
762
	if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
763 764 765 766 767 768 769 770 771 772 773
		goto skip;

	/*
	 * We stop the GC thread if FS is mounted as RO
	 * or if background_gc = off is passed in mount
	 * option. Also sync the filesystem.
	 */
	if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
		if (sbi->gc_thread) {
			stop_gc_thread(sbi);
			f2fs_sync_fs(sb, 1);
774
			need_restart_gc = true;
775
		}
776
	} else if (!sbi->gc_thread) {
777 778 779
		err = start_gc_thread(sbi);
		if (err)
			goto restore_opts;
780 781 782 783 784 785 786 787
		need_stop_gc = true;
	}

	/*
	 * We stop issue flush thread if FS is mounted as RO
	 * or if flush_merge is not passed in mount option.
	 */
	if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
788
		destroy_flush_cmd_control(sbi);
789
	} else if (!SM_I(sbi)->cmd_control_info) {
790 791
		err = create_flush_cmd_control(sbi);
		if (err)
792
			goto restore_gc;
793 794 795 796 797 798
	}
skip:
	/* Update the POSIXACL Flag */
	 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
	return 0;
799 800 801 802
restore_gc:
	if (need_restart_gc) {
		if (start_gc_thread(sbi))
			f2fs_msg(sbi->sb, KERN_WARNING,
A
arter97 已提交
803
				"background gc thread has stopped");
804 805 806
	} else if (need_stop_gc) {
		stop_gc_thread(sbi);
	}
807 808 809 810 811 812
restore_opts:
	sbi->mount_opt = org_mount_opt;
	sbi->active_logs = active_logs;
	return err;
}

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Jaegeuk Kim 已提交
813 814
static struct super_operations f2fs_sops = {
	.alloc_inode	= f2fs_alloc_inode,
815
	.drop_inode	= f2fs_drop_inode,
J
Jaegeuk Kim 已提交
816 817
	.destroy_inode	= f2fs_destroy_inode,
	.write_inode	= f2fs_write_inode,
818
	.dirty_inode	= f2fs_dirty_inode,
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Jaegeuk Kim 已提交
819 820 821 822
	.show_options	= f2fs_show_options,
	.evict_inode	= f2fs_evict_inode,
	.put_super	= f2fs_put_super,
	.sync_fs	= f2fs_sync_fs,
823 824
	.freeze_fs	= f2fs_freeze,
	.unfreeze_fs	= f2fs_unfreeze,
J
Jaegeuk Kim 已提交
825
	.statfs		= f2fs_statfs,
826
	.remount_fs	= f2fs_remount,
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Jaegeuk Kim 已提交
827 828 829 830 831 832 833 834
};

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;

835
	if (check_nid_range(sbi, ino))
836
		return ERR_PTR(-ESTALE);
J
Jaegeuk Kim 已提交
837 838 839 840 841 842 843 844 845

	/*
	 * 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);
846
	if (unlikely(generation && inode->i_generation != generation)) {
J
Jaegeuk Kim 已提交
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
		/* 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 loff_t max_file_size(unsigned bits)
{
876
	loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
J
Jaegeuk Kim 已提交
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
	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;
}

894 895
static int sanity_check_raw_super(struct super_block *sb,
			struct f2fs_super_block *raw_super)
J
Jaegeuk Kim 已提交
896 897 898
{
	unsigned int blocksize;

899 900 901 902
	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));
J
Jaegeuk Kim 已提交
903
		return 1;
904
	}
J
Jaegeuk Kim 已提交
905

906 907 908
	/* Currently, support only 4KB page cache size */
	if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
		f2fs_msg(sb, KERN_INFO,
909
			"Invalid page_cache_size (%lu), supports only 4KB\n",
910 911 912 913
			PAGE_CACHE_SIZE);
		return 1;
	}

J
Jaegeuk Kim 已提交
914 915
	/* Currently, support only 4KB block size */
	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
916
	if (blocksize != F2FS_BLKSIZE) {
917 918 919
		f2fs_msg(sb, KERN_INFO,
			"Invalid blocksize (%u), supports only 4KB\n",
			blocksize);
J
Jaegeuk Kim 已提交
920
		return 1;
921
	}
922

C
Chao Yu 已提交
923 924 925 926 927 928 929
	/* Currently, support 512/1024/2048/4096 bytes sector size */
	if (le32_to_cpu(raw_super->log_sectorsize) >
				F2FS_MAX_LOG_SECTOR_SIZE ||
		le32_to_cpu(raw_super->log_sectorsize) <
				F2FS_MIN_LOG_SECTOR_SIZE) {
		f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
			le32_to_cpu(raw_super->log_sectorsize));
J
Jaegeuk Kim 已提交
930
		return 1;
931
	}
C
Chao Yu 已提交
932 933 934 935 936 937 938
	if (le32_to_cpu(raw_super->log_sectors_per_block) +
		le32_to_cpu(raw_super->log_sectorsize) !=
			F2FS_MAX_LOG_SECTOR_SIZE) {
		f2fs_msg(sb, KERN_INFO,
			"Invalid log sectors per block(%u) log sectorsize(%u)",
			le32_to_cpu(raw_super->log_sectors_per_block),
			le32_to_cpu(raw_super->log_sectorsize));
J
Jaegeuk Kim 已提交
939
		return 1;
940
	}
J
Jaegeuk Kim 已提交
941 942 943
	return 0;
}

944
static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
J
Jaegeuk Kim 已提交
945 946
{
	unsigned int total, fsmeta;
947 948
	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
J
Jaegeuk Kim 已提交
949 950 951 952 953 954 955 956

	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);

957
	if (unlikely(fsmeta >= total))
J
Jaegeuk Kim 已提交
958
		return 1;
959

960
	if (unlikely(f2fs_cp_error(sbi))) {
961 962 963
		f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
		return 1;
	}
J
Jaegeuk Kim 已提交
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
	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);
987
	sbi->cur_victim_sec = NULL_SECNO;
988
	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
J
Jaegeuk Kim 已提交
989 990 991

	for (i = 0; i < NR_COUNT_TYPE; i++)
		atomic_set(&sbi->nr_pages[i], 0);
992 993

	sbi->dir_level = DEF_DIR_LEVEL;
994
	clear_sbi_flag(sbi, SBI_NEED_FSCK);
995 996 997

	INIT_LIST_HEAD(&sbi->s_list);
	mutex_init(&sbi->umount_mutex);
J
Jaegeuk Kim 已提交
998 999
}

1000 1001 1002 1003 1004 1005 1006
/*
 * Read f2fs raw super block.
 * Because we have two copies of super block, so read the first one at first,
 * if the first one is invalid, move to read the second one.
 */
static int read_raw_super_block(struct super_block *sb,
			struct f2fs_super_block **raw_super,
1007 1008
			struct buffer_head **raw_super_buf,
			int *recovery)
1009
{
1010
	int block = 0;
1011 1012 1013
	struct buffer_head *buffer;
	struct f2fs_super_block *super;
	int err = 0;
1014

1015
retry:
1016 1017 1018
	buffer = sb_bread(sb, block);
	if (!buffer) {
		*recovery = 1;
1019 1020 1021 1022 1023 1024
		f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
				block + 1);
		if (block == 0) {
			block++;
			goto retry;
		} else {
1025 1026
			err = -EIO;
			goto out;
1027
		}
1028 1029
	}

1030 1031
	super = (struct f2fs_super_block *)
		((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
1032 1033

	/* sanity checking of raw super */
1034 1035 1036
	if (sanity_check_raw_super(sb, super)) {
		brelse(buffer);
		*recovery = 1;
C
Chris Fries 已提交
1037 1038 1039
		f2fs_msg(sb, KERN_ERR,
			"Can't find valid F2FS filesystem in %dth superblock",
								block + 1);
1040
		if (block == 0) {
1041 1042 1043
			block++;
			goto retry;
		} else {
1044 1045
			err = -EINVAL;
			goto out;
1046 1047
		}
	}
1048

1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	if (!*raw_super) {
		*raw_super_buf = buffer;
		*raw_super = super;
	} else {
		/* already have a valid superblock */
		brelse(buffer);
	}

	/* check the validity of the second superblock */
	if (block == 0) {
		block++;
		goto retry;
	}

out:
	/* No valid superblock */
	if (!*raw_super)
		return err;

1068
	return 0;
1069 1070
}

C
Chao Yu 已提交
1071
int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
J
Jaegeuk Kim 已提交
1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082
{
	struct buffer_head *sbh = sbi->raw_super_buf;
	sector_t block = sbh->b_blocknr;
	int err;

	/* write back-up superblock first */
	sbh->b_blocknr = block ? 0 : 1;
	mark_buffer_dirty(sbh);
	err = sync_dirty_buffer(sbh);

	sbh->b_blocknr = block;
C
Chao Yu 已提交
1083 1084 1085

	/* if we are in recovery path, skip writing valid superblock */
	if (recover || err)
J
Jaegeuk Kim 已提交
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
		goto out;

	/* write current valid superblock */
	mark_buffer_dirty(sbh);
	err = sync_dirty_buffer(sbh);
out:
	clear_buffer_write_io_error(sbh);
	set_buffer_uptodate(sbh);
	return err;
}

J
Jaegeuk Kim 已提交
1097 1098 1099
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct f2fs_sb_info *sbi;
1100
	struct f2fs_super_block *raw_super;
J
Jaegeuk Kim 已提交
1101 1102
	struct buffer_head *raw_super_buf;
	struct inode *root;
1103
	long err;
1104
	bool retry = true, need_fsck = false;
1105
	char *options = NULL;
1106
	int recovery, i;
J
Jaegeuk Kim 已提交
1107

1108
try_onemore:
1109 1110 1111 1112 1113
	err = -EINVAL;
	raw_super = NULL;
	raw_super_buf = NULL;
	recovery = 0;

J
Jaegeuk Kim 已提交
1114 1115 1116 1117 1118
	/* allocate memory for f2fs-specific super block info */
	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

1119
	/* set a block size */
1120
	if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1121
		f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
J
Jaegeuk Kim 已提交
1122
		goto free_sbi;
1123
	}
J
Jaegeuk Kim 已提交
1124

1125
	err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
1126 1127 1128
	if (err)
		goto free_sbi;

1129
	sb->s_fs_info = sbi;
1130
	default_options(sbi);
J
Jaegeuk Kim 已提交
1131
	/* parse mount options */
1132 1133 1134
	options = kstrdup((const char *)data, GFP_KERNEL);
	if (data && !options) {
		err = -ENOMEM;
J
Jaegeuk Kim 已提交
1135
		goto free_sb_buf;
1136 1137 1138 1139 1140
	}

	err = parse_options(sb, options);
	if (err)
		goto free_options;
J
Jaegeuk Kim 已提交
1141

1142
	sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
J
Jaegeuk Kim 已提交
1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
	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_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);
1160
	mutex_init(&sbi->writepages);
J
Jaegeuk Kim 已提交
1161
	mutex_init(&sbi->cp_mutex);
1162
	init_rwsem(&sbi->node_write);
1163
	clear_sbi_flag(sbi, SBI_POR_DOING);
J
Jaegeuk Kim 已提交
1164
	spin_lock_init(&sbi->stat_lock);
1165

1166
	init_rwsem(&sbi->read_io.io_rwsem);
J
Jaegeuk Kim 已提交
1167 1168 1169
	sbi->read_io.sbi = sbi;
	sbi->read_io.bio = NULL;
	for (i = 0; i < NR_PAGE_TYPE; i++) {
1170
		init_rwsem(&sbi->write_io[i].io_rwsem);
J
Jaegeuk Kim 已提交
1171 1172 1173
		sbi->write_io[i].sbi = sbi;
		sbi->write_io[i].bio = NULL;
	}
1174

1175
	init_rwsem(&sbi->cp_rwsem);
1176
	init_waitqueue_head(&sbi->cp_wait);
J
Jaegeuk Kim 已提交
1177 1178 1179 1180 1181
	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)) {
1182
		f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
J
Jaegeuk Kim 已提交
1183
		err = PTR_ERR(sbi->meta_inode);
1184
		goto free_options;
J
Jaegeuk Kim 已提交
1185 1186 1187
	}

	err = get_valid_checkpoint(sbi);
1188 1189
	if (err) {
		f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
J
Jaegeuk Kim 已提交
1190
		goto free_meta_inode;
1191
	}
J
Jaegeuk Kim 已提交
1192 1193 1194

	/* sanity checking of checkpoint */
	err = -EINVAL;
1195
	if (sanity_check_ckpt(sbi)) {
1196
		f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
J
Jaegeuk Kim 已提交
1197
		goto free_cp;
1198
	}
J
Jaegeuk Kim 已提交
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211

	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);

C
Chao Yu 已提交
1212 1213
	init_extent_cache_info(sbi);

J
Jaegeuk Kim 已提交
1214
	init_ino_entry_info(sbi);
J
Jaegeuk Kim 已提交
1215 1216 1217

	/* setup f2fs internal modules */
	err = build_segment_manager(sbi);
1218 1219 1220
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS segment manager");
J
Jaegeuk Kim 已提交
1221
		goto free_sm;
1222
	}
J
Jaegeuk Kim 已提交
1223
	err = build_node_manager(sbi);
1224 1225 1226
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS node manager");
J
Jaegeuk Kim 已提交
1227
		goto free_nm;
1228
	}
J
Jaegeuk Kim 已提交
1229 1230 1231 1232 1233 1234

	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)) {
1235
		f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
J
Jaegeuk Kim 已提交
1236 1237 1238 1239
		err = PTR_ERR(sbi->node_inode);
		goto free_nm;
	}

1240 1241
	f2fs_join_shrinker(sbi);

J
Jaegeuk Kim 已提交
1242
	/* if there are nt orphan nodes free them */
1243
	recover_orphan_inodes(sbi);
J
Jaegeuk Kim 已提交
1244 1245 1246 1247

	/* read root inode and dentry */
	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
	if (IS_ERR(root)) {
1248
		f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
J
Jaegeuk Kim 已提交
1249 1250 1251
		err = PTR_ERR(root);
		goto free_node_inode;
	}
1252
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1253
		iput(root);
1254
		err = -EINVAL;
1255
		goto free_node_inode;
1256
	}
J
Jaegeuk Kim 已提交
1257 1258 1259 1260 1261 1262 1263 1264 1265

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

	err = f2fs_build_stats(sbi);
	if (err)
1266
		goto free_root_inode;
J
Jaegeuk Kim 已提交
1267

1268 1269 1270 1271 1272 1273 1274
	if (f2fs_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

	if (sbi->s_proc)
		proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
				 &f2fs_seq_segment_info_fops, sb);

1275 1276 1277 1278 1279
	sbi->s_kobj.kset = f2fs_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
							"%s", sb->s_id);
	if (err)
1280
		goto free_proc;
1281

1282 1283
	/* recover fsynced data */
	if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1284 1285 1286 1287 1288 1289 1290 1291 1292
		/*
		 * mount should be failed, when device has readonly mode, and
		 * previous checkpoint was not done by clean system shutdown.
		 */
		if (bdev_read_only(sb->s_bdev) &&
				!is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
			err = -EROFS;
			goto free_kobj;
		}
1293 1294 1295 1296

		if (need_fsck)
			set_sbi_flag(sbi, SBI_NEED_FSCK);

1297
		err = recover_fsync_data(sbi);
1298
		if (err) {
1299
			need_fsck = true;
1300 1301
			f2fs_msg(sb, KERN_ERR,
				"Cannot recover all fsync data errno=%ld", err);
1302 1303
			goto free_kobj;
		}
1304
	}
1305

1306 1307 1308 1309
	/*
	 * If filesystem is not mounted as read-only then
	 * do start the gc_thread.
	 */
1310
	if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1311 1312 1313 1314 1315
		/* After POR, we can run background GC thread.*/
		err = start_gc_thread(sbi);
		if (err)
			goto free_kobj;
	}
1316
	kfree(options);
1317 1318 1319 1320

	/* recover broken superblock */
	if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
		f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
C
Chao Yu 已提交
1321
		f2fs_commit_super(sbi, true);
1322 1323
	}

J
Jaegeuk Kim 已提交
1324
	return 0;
1325 1326 1327 1328

free_kobj:
	kobject_del(&sbi->s_kobj);
free_proc:
1329 1330 1331 1332 1333
	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
	f2fs_destroy_stats(sbi);
J
Jaegeuk Kim 已提交
1334 1335 1336 1337
free_root_inode:
	dput(sb->s_root);
	sb->s_root = NULL;
free_node_inode:
1338 1339
	mutex_lock(&sbi->umount_mutex);
	f2fs_leave_shrinker(sbi);
J
Jaegeuk Kim 已提交
1340
	iput(sbi->node_inode);
1341
	mutex_unlock(&sbi->umount_mutex);
J
Jaegeuk Kim 已提交
1342 1343 1344 1345 1346 1347 1348 1349 1350
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);
1351 1352
free_options:
	kfree(options);
J
Jaegeuk Kim 已提交
1353 1354 1355 1356
free_sb_buf:
	brelse(raw_super_buf);
free_sbi:
	kfree(sbi);
1357 1358 1359

	/* give only one another chance */
	if (retry) {
1360
		retry = false;
1361 1362 1363
		shrink_dcache_sb(sb);
		goto try_onemore;
	}
J
Jaegeuk Kim 已提交
1364 1365 1366 1367 1368 1369 1370 1371 1372
	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);
}

1373 1374 1375
static void kill_f2fs_super(struct super_block *sb)
{
	if (sb->s_root)
1376
		set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1377 1378 1379
	kill_block_super(sb);
}

J
Jaegeuk Kim 已提交
1380 1381 1382 1383
static struct file_system_type f2fs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "f2fs",
	.mount		= f2fs_mount,
1384
	.kill_sb	= kill_f2fs_super,
J
Jaegeuk Kim 已提交
1385 1386
	.fs_flags	= FS_REQUIRES_DEV,
};
1387
MODULE_ALIAS_FS("f2fs");
J
Jaegeuk Kim 已提交
1388

1389
static int __init init_inodecache(void)
J
Jaegeuk Kim 已提交
1390 1391
{
	f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1392
			sizeof(struct f2fs_inode_info));
1393
	if (!f2fs_inode_cachep)
J
Jaegeuk Kim 已提交
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
		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;

1412 1413
	f2fs_build_trace_ios();

J
Jaegeuk Kim 已提交
1414 1415 1416 1417 1418
	err = init_inodecache();
	if (err)
		goto fail;
	err = create_node_manager_caches();
	if (err)
1419
		goto free_inodecache;
1420
	err = create_segment_manager_caches();
J
Jaegeuk Kim 已提交
1421
	if (err)
1422
		goto free_node_manager_caches;
J
Jaegeuk Kim 已提交
1423 1424
	err = create_checkpoint_caches();
	if (err)
1425
		goto free_segment_manager_caches;
C
Chao Yu 已提交
1426 1427 1428
	err = create_extent_cache();
	if (err)
		goto free_checkpoint_caches;
1429
	f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1430 1431
	if (!f2fs_kset) {
		err = -ENOMEM;
C
Chao Yu 已提交
1432
		goto free_extent_cache;
1433
	}
1434
	err = f2fs_init_crypto();
1435
	if (err)
1436
		goto free_kset;
1437 1438

	err = register_shrinker(&f2fs_shrinker_info);
1439 1440
	if (err)
		goto free_crypto;
1441 1442 1443 1444

	err = register_filesystem(&f2fs_fs_type);
	if (err)
		goto free_shrinker;
1445
	f2fs_create_root_stats();
1446
	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1447 1448
	return 0;

1449 1450
free_shrinker:
	unregister_shrinker(&f2fs_shrinker_info);
1451 1452
free_crypto:
	f2fs_exit_crypto();
1453 1454
free_kset:
	kset_unregister(f2fs_kset);
C
Chao Yu 已提交
1455 1456
free_extent_cache:
	destroy_extent_cache();
1457 1458
free_checkpoint_caches:
	destroy_checkpoint_caches();
1459 1460
free_segment_manager_caches:
	destroy_segment_manager_caches();
1461 1462 1463 1464
free_node_manager_caches:
	destroy_node_manager_caches();
free_inodecache:
	destroy_inodecache();
J
Jaegeuk Kim 已提交
1465 1466 1467 1468 1469 1470
fail:
	return err;
}

static void __exit exit_f2fs_fs(void)
{
1471
	remove_proc_entry("fs/f2fs", NULL);
1472
	f2fs_destroy_root_stats();
1473
	unregister_shrinker(&f2fs_shrinker_info);
J
Jaegeuk Kim 已提交
1474
	unregister_filesystem(&f2fs_fs_type);
1475
	f2fs_exit_crypto();
W
Wanpeng Li 已提交
1476
	destroy_extent_cache();
J
Jaegeuk Kim 已提交
1477
	destroy_checkpoint_caches();
1478
	destroy_segment_manager_caches();
J
Jaegeuk Kim 已提交
1479 1480
	destroy_node_manager_caches();
	destroy_inodecache();
1481
	kset_unregister(f2fs_kset);
1482
	f2fs_destroy_trace_ios();
J
Jaegeuk Kim 已提交
1483 1484 1485 1486 1487 1488 1489 1490
}

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");