super.c 37.4 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(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
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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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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, cp_interval);
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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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	ATTR_LIST(ra_nid_pages),
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	ATTR_LIST(cp_interval),
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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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				clear_opt(sbi, FORCE_FG_GC);
			} else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
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				clear_opt(sbi, BG_GC);
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				clear_opt(sbi, FORCE_FG_GC);
			} else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
				set_opt(sbi, BG_GC);
				set_opt(sbi, FORCE_FG_GC);
			} else {
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				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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	init_rwsem(&fi->i_sem);
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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)) {
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			/* to avoid evict_inode call simultaneously */
			atomic_inc(&inode->i_count);
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			spin_unlock(&inode->i_lock);

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

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			/* should remain fi->extent_tree for writepage */
			f2fs_destroy_extent_node(inode);

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

			if (F2FS_HAS_BLOCKS(inode))
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				f2fs_truncate(inode, true);
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			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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			atomic_dec(&inode->i_count);
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		}
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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);

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	trace_f2fs_sync_fs(sb, sync);

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	if (sync) {
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		struct cp_control cpc;

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		cpc.reason = __get_cp_reason(sbi);

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		mutex_lock(&sbi->gc_mutex);
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		write_checkpoint(sbi, &cpc);
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		mutex_unlock(&sbi->gc_mutex);
	} else {
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		f2fs_balance_fs(sbi);
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	}
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	f2fs_trace_ios(NULL, 1);
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	return 0;
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}

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static int f2fs_freeze(struct super_block *sb)
{
	int err;

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	if (f2fs_readonly(sb))
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		return 0;

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

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

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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);

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	buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
	buf->f_ffree = buf->f_files - valid_inode_count(sbi);
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	buf->f_namelen = F2FS_NAME_LEN;
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	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);

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	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
		if (test_opt(sbi, FORCE_FG_GC))
			seq_printf(seq, ",background_gc=%s", "sync");
		else
			seq_printf(seq, ",background_gc=%s", "on");
	} else {
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		seq_printf(seq, ",background_gc=%s", "off");
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	}
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	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");
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	if (test_opt(sbi, INLINE_XATTR))
		seq_puts(seq, ",inline_xattr");
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#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))
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		seq_puts(seq, ",disable_ext_identify");
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	if (test_opt(sbi, INLINE_DATA))
		seq_puts(seq, ",inline_data");
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	else
		seq_puts(seq, ",noinline_data");
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	if (test_opt(sbi, INLINE_DENTRY))
		seq_puts(seq, ",inline_dentry");
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	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
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		seq_puts(seq, ",flush_merge");
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	if (test_opt(sbi, NOBARRIER))
		seq_puts(seq, ",nobarrier");
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	if (test_opt(sbi, FASTBOOT))
		seq_puts(seq, ",fastboot");
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	if (test_opt(sbi, EXTENT_CACHE))
		seq_puts(seq, ",extent_cache");
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	else
		seq_puts(seq, ",noextent_cache");
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	seq_printf(seq, ",active_logs=%u", sbi->active_logs);

	return 0;
}

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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);
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	unsigned int total_segs =
			le32_to_cpu(sbi->raw_super->segment_count_main);
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	int i;

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

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	for (i = 0; i < total_segs; i++) {
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		struct seg_entry *se = get_seg_entry(sbi, i);

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

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

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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;
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	bool need_restart_gc = false;
	bool need_stop_gc = false;
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	bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
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	sync_filesystem(sb);

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	/*
	 * Save the old mount options in case we
	 * need to restore them.
	 */
	org_mount_opt = sbi->mount_opt;
	active_logs = sbi->active_logs;

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	sbi->mount_opt.opt = 0;
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	default_options(sbi);
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	/* parse mount options */
	err = parse_options(sb, data);
	if (err)
		goto restore_opts;

	/*
	 * Previous and new state of filesystem is RO,
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	 * so skip checking GC and FLUSH_MERGE conditions.
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	 */
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	if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
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		goto skip;

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	/* disallow enable/disable extent_cache dynamically */
	if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
		err = -EINVAL;
		f2fs_msg(sbi->sb, KERN_WARNING,
				"switch extent_cache option is not allowed");
		goto restore_opts;
	}

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	/*
	 * 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);
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			need_restart_gc = true;
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		}
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	} else if (!sbi->gc_thread) {
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		err = start_gc_thread(sbi);
		if (err)
			goto restore_opts;
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		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)) {
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		destroy_flush_cmd_control(sbi);
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	} else if (!SM_I(sbi)->cmd_control_info) {
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		err = create_flush_cmd_control(sbi);
		if (err)
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			goto restore_gc;
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	}
skip:
	/* Update the POSIXACL Flag */
	 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
	return 0;
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restore_gc:
	if (need_restart_gc) {
		if (start_gc_thread(sbi))
			f2fs_msg(sbi->sb, KERN_WARNING,
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				"background gc thread has stopped");
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	} else if (need_stop_gc) {
		stop_gc_thread(sbi);
	}
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restore_opts:
	sbi->mount_opt = org_mount_opt;
	sbi->active_logs = active_logs;
	return err;
}

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static struct super_operations f2fs_sops = {
	.alloc_inode	= f2fs_alloc_inode,
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	.drop_inode	= f2fs_drop_inode,
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	.destroy_inode	= f2fs_destroy_inode,
	.write_inode	= f2fs_write_inode,
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	.dirty_inode	= f2fs_dirty_inode,
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	.show_options	= f2fs_show_options,
	.evict_inode	= f2fs_evict_inode,
	.put_super	= f2fs_put_super,
	.sync_fs	= f2fs_sync_fs,
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	.freeze_fs	= f2fs_freeze,
	.unfreeze_fs	= f2fs_unfreeze,
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	.statfs		= f2fs_statfs,
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	.remount_fs	= f2fs_remount,
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};

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;

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	if (check_nid_range(sbi, ino))
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		return ERR_PTR(-ESTALE);
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	/*
	 * 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);
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	if (unlikely(generation && inode->i_generation != generation)) {
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		/* 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)
{
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	loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
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	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;
}

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

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

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	/* Currently, support only 4KB block size */
	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
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	if (blocksize != F2FS_BLKSIZE) {
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		f2fs_msg(sb, KERN_INFO,
			"Invalid blocksize (%u), supports only 4KB\n",
			blocksize);
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		return 1;
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	}
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	/* 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));
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		return 1;
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	}
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	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));
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		return 1;
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	}
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	return 0;
}

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static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
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{
	unsigned int total, fsmeta;
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	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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	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);

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	if (unlikely(fsmeta >= total))
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		return 1;
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	if (unlikely(f2fs_cp_error(sbi))) {
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		f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
		return 1;
	}
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	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);
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	sbi->cur_victim_sec = NULL_SECNO;
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	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
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	for (i = 0; i < NR_COUNT_TYPE; i++)
		atomic_set(&sbi->nr_pages[i], 0);
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	sbi->dir_level = DEF_DIR_LEVEL;
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	sbi->cp_interval = DEF_CP_INTERVAL;
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	clear_sbi_flag(sbi, SBI_NEED_FSCK);
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	INIT_LIST_HEAD(&sbi->s_list);
	mutex_init(&sbi->umount_mutex);
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}

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/*
 * 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,
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			struct buffer_head **raw_super_buf,
			int *recovery)
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{
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	int block = 0;
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	struct buffer_head *buffer;
	struct f2fs_super_block *super;
	int err = 0;
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retry:
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	buffer = sb_bread(sb, block);
	if (!buffer) {
		*recovery = 1;
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		f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
				block + 1);
		if (block == 0) {
			block++;
			goto retry;
		} else {
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			err = -EIO;
			goto out;
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		}
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	}

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	super = (struct f2fs_super_block *)
		((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
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	/* sanity checking of raw super */
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	if (sanity_check_raw_super(sb, super)) {
		brelse(buffer);
		*recovery = 1;
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		f2fs_msg(sb, KERN_ERR,
			"Can't find valid F2FS filesystem in %dth superblock",
								block + 1);
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		if (block == 0) {
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			block++;
			goto retry;
		} else {
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			err = -EINVAL;
			goto out;
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		}
	}
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	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;

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	return 0;
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}

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int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
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{
	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;
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	/* if we are in recovery path, skip writing valid superblock */
	if (recover || err)
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		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;
}

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static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct f2fs_sb_info *sbi;
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	struct f2fs_super_block *raw_super;
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	struct buffer_head *raw_super_buf;
	struct inode *root;
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	long err;
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	bool retry = true, need_fsck = false;
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	char *options = NULL;
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	int recovery, i;
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try_onemore:
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	err = -EINVAL;
	raw_super = NULL;
	raw_super_buf = NULL;
	recovery = 0;

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

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	/* set a block size */
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	if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
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		f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
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		goto free_sbi;
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	}
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	err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
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	if (err)
		goto free_sbi;

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	sb->s_fs_info = sbi;
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	default_options(sbi);
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	/* parse mount options */
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	options = kstrdup((const char *)data, GFP_KERNEL);
	if (data && !options) {
		err = -ENOMEM;
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		goto free_sb_buf;
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	}

	err = parse_options(sb, options);
	if (err)
		goto free_options;
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	sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
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	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);
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	mutex_init(&sbi->writepages);
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	mutex_init(&sbi->cp_mutex);
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	init_rwsem(&sbi->node_write);
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	/* disallow all the data/node/meta page writes */
	set_sbi_flag(sbi, SBI_POR_DOING);
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	spin_lock_init(&sbi->stat_lock);
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	init_rwsem(&sbi->read_io.io_rwsem);
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	sbi->read_io.sbi = sbi;
	sbi->read_io.bio = NULL;
	for (i = 0; i < NR_PAGE_TYPE; i++) {
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		init_rwsem(&sbi->write_io[i].io_rwsem);
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		sbi->write_io[i].sbi = sbi;
		sbi->write_io[i].bio = NULL;
	}
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