super.c 51.9 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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#ifdef CONFIG_F2FS_FAULT_INJECTION
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struct f2fs_fault_info f2fs_fault;
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char *fault_name[FAULT_MAX] = {
	[FAULT_KMALLOC]		= "kmalloc",
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	[FAULT_PAGE_ALLOC]	= "page alloc",
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	[FAULT_ALLOC_NID]	= "alloc nid",
	[FAULT_ORPHAN]		= "orphan",
	[FAULT_BLOCK]		= "no more block",
	[FAULT_DIR_DEPTH]	= "too big dir depth",
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	[FAULT_EVICT_INODE]	= "evict_inode fail",
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};
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static void f2fs_build_fault_attr(unsigned int rate)
{
	if (rate) {
		atomic_set(&f2fs_fault.inject_ops, 0);
		f2fs_fault.inject_rate = rate;
		f2fs_fault.inject_type = (1 << FAULT_MAX) - 1;
	} else {
		memset(&f2fs_fault, 0, sizeof(struct f2fs_fault_info));
	}
}
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#endif

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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_noflush_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_data_flush,
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	Opt_mode,
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	Opt_fault_injection,
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	Opt_lazytime,
	Opt_nolazytime,
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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_noflush_merge, "noflush_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_data_flush, "data_flush"},
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	{Opt_mode, "mode=%s"},
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	{Opt_fault_injection, "fault_injection=%u"},
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	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
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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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#ifdef CONFIG_F2FS_FAULT_INJECTION
	FAULT_INFO_RATE,	/* struct f2fs_fault_info */
	FAULT_INFO_TYPE,	/* struct f2fs_fault_info */
#endif
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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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#ifdef CONFIG_F2FS_FAULT_INJECTION
	else if (struct_type == FAULT_INFO_RATE ||
					struct_type == FAULT_INFO_TYPE)
		return (unsigned char *)&f2fs_fault;
#endif
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	return NULL;
}

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static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
		struct f2fs_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->sb;

	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");

	return snprintf(buf, PAGE_SIZE, "%llu\n",
		(unsigned long long)(sbi->kbytes_written +
			BD_PART_WRITTEN(sbi)));
}

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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;
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#ifdef CONFIG_F2FS_FAULT_INJECTION
	if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
		return -EINVAL;
#endif
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	*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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#define F2FS_GENERAL_RO_ATTR(name) \
static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)

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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(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
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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, interval_time[CP_TIME]);
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F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
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#ifdef CONFIG_F2FS_FAULT_INJECTION
F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
#endif
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F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
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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(dirty_nats_ratio),
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	ATTR_LIST(cp_interval),
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	ATTR_LIST(idle_interval),
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	ATTR_LIST(lifetime_write_kbytes),
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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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#ifdef CONFIG_F2FS_FAULT_INJECTION
/* sysfs for f2fs fault injection */
static struct kobject f2fs_fault_inject;

static struct attribute *f2fs_fault_attrs[] = {
	ATTR_LIST(inject_rate),
	ATTR_LIST(inject_type),
	NULL
};

static struct kobj_type f2fs_fault_ktype = {
	.default_attrs	= f2fs_fault_attrs,
	.sysfs_ops	= &f2fs_attr_ops,
};
#endif

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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;

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#ifdef CONFIG_F2FS_FAULT_INJECTION
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	f2fs_build_fault_attr(0);
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#endif
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	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_noflush_merge:
			clear_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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		case Opt_data_flush:
			set_opt(sbi, DATA_FLUSH);
			break;
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		case Opt_mode:
			name = match_strdup(&args[0]);

			if (!name)
				return -ENOMEM;
			if (strlen(name) == 8 &&
					!strncmp(name, "adaptive", 8)) {
				set_opt(sbi, ADAPTIVE);
				clear_opt(sbi, LFS);
			} else if (strlen(name) == 3 &&
					!strncmp(name, "lfs", 3)) {
				clear_opt(sbi, ADAPTIVE);
				set_opt(sbi, LFS);
			} else {
				kfree(name);
				return -EINVAL;
			}
			kfree(name);
			break;
530 531 532 533
		case Opt_fault_injection:
			if (args->from && match_int(args, &arg))
				return -EINVAL;
#ifdef CONFIG_F2FS_FAULT_INJECTION
S
Sheng Yong 已提交
534
			f2fs_build_fault_attr(arg);
535 536 537 538 539
#else
			f2fs_msg(sb, KERN_INFO,
				"FAULT_INJECTION was not selected");
#endif
			break;
J
Jaegeuk Kim 已提交
540 541 542 543 544 545
		case Opt_lazytime:
			sb->s_flags |= MS_LAZYTIME;
			break;
		case Opt_nolazytime:
			sb->s_flags &= ~MS_LAZYTIME;
			break;
546 547 548 549 550 551 552 553 554 555
		default:
			f2fs_msg(sb, KERN_ERR,
				"Unrecognized mount option \"%s\" or missing value",
				p);
			return -EINVAL;
		}
	}
	return 0;
}

J
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556 557 558 559
static struct inode *f2fs_alloc_inode(struct super_block *sb)
{
	struct f2fs_inode_info *fi;

560
	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
J
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561 562 563 564 565
	if (!fi)
		return NULL;

	init_once((void *) fi);

566 567 568 569 570
	if (percpu_counter_init(&fi->dirty_pages, 0, GFP_NOFS)) {
		kmem_cache_free(f2fs_inode_cachep, fi);
		return NULL;
	}

M
Masanari Iida 已提交
571
	/* Initialize f2fs-specific inode info */
J
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572 573 574
	fi->vfs_inode.i_version = 1;
	fi->i_current_depth = 1;
	fi->i_advise = 0;
575
	init_rwsem(&fi->i_sem);
576
	INIT_LIST_HEAD(&fi->dirty_list);
577
	INIT_LIST_HEAD(&fi->gdirty_list);
J
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578 579
	INIT_LIST_HEAD(&fi->inmem_pages);
	mutex_init(&fi->inmem_lock);
J
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580

581 582
	/* Will be used by directory only */
	fi->i_dir_level = F2FS_SB(sb)->dir_level;
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583 584 585
	return &fi->vfs_inode;
}

586 587 588 589 590 591 592 593 594
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)
	 */
595
	if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
596
		if (!inode->i_nlink && !is_bad_inode(inode)) {
J
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597 598
			/* to avoid evict_inode call simultaneously */
			atomic_inc(&inode->i_count);
599 600 601 602
			spin_unlock(&inode->i_lock);

			/* some remained atomic pages should discarded */
			if (f2fs_is_atomic_file(inode))
603
				drop_inmem_pages(inode);
604

J
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605 606 607
			/* should remain fi->extent_tree for writepage */
			f2fs_destroy_extent_node(inode);

608
			sb_start_intwrite(inode->i_sb);
609
			f2fs_i_size_write(inode, 0);
610 611

			if (F2FS_HAS_BLOCKS(inode))
612
				f2fs_truncate(inode);
613 614 615

			sb_end_intwrite(inode->i_sb);

616
			fscrypt_put_encryption_info(inode, NULL);
617
			spin_lock(&inode->i_lock);
J
Jaegeuk Kim 已提交
618
			atomic_dec(&inode->i_count);
619
		}
620
		return 0;
621
	}
622

623
	return generic_drop_inode(inode);
624 625
}

626 627 628 629 630 631 632
/*
 * 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)
{
633 634 635 636 637 638
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	if (inode->i_ino == F2FS_NODE_INO(sbi) ||
			inode->i_ino == F2FS_META_INO(sbi))
		return;

J
Jaegeuk Kim 已提交
639 640 641
	if (flags == I_DIRTY_TIME)
		return;

642 643 644
	if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
		clear_inode_flag(inode, FI_AUTO_RECOVER);

645 646 647 648 649 650
	spin_lock(&sbi->inode_lock[DIRTY_META]);
	if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
		spin_unlock(&sbi->inode_lock[DIRTY_META]);
		return;
	}

651
	set_inode_flag(inode, FI_DIRTY_INODE);
652 653 654 655
	list_add_tail(&F2FS_I(inode)->gdirty_list,
				&sbi->inode_list[DIRTY_META]);
	inc_page_count(sbi, F2FS_DIRTY_IMETA);
	stat_inc_dirty_inode(sbi, DIRTY_META);
656
	spin_unlock(&sbi->inode_lock[DIRTY_META]);
657 658 659 660 661 662 663 664 665 666 667 668 669
}

void f2fs_inode_synced(struct inode *inode)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	spin_lock(&sbi->inode_lock[DIRTY_META]);
	if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) {
		spin_unlock(&sbi->inode_lock[DIRTY_META]);
		return;
	}
	list_del_init(&F2FS_I(inode)->gdirty_list);
	clear_inode_flag(inode, FI_DIRTY_INODE);
670
	clear_inode_flag(inode, FI_AUTO_RECOVER);
671 672
	dec_page_count(sbi, F2FS_DIRTY_IMETA);
	stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
673
	spin_unlock(&sbi->inode_lock[DIRTY_META]);
674 675
}

J
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676 677 678 679 680 681
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));
}

682
static void f2fs_destroy_inode(struct inode *inode)
J
Jaegeuk Kim 已提交
683
{
684
	percpu_counter_destroy(&F2FS_I(inode)->dirty_pages);
J
Jaegeuk Kim 已提交
685 686 687
	call_rcu(&inode->i_rcu, f2fs_i_callback);
}

688 689 690 691 692 693
static void destroy_percpu_info(struct f2fs_sb_info *sbi)
{
	int i;

	for (i = 0; i < NR_COUNT_TYPE; i++)
		percpu_counter_destroy(&sbi->nr_pages[i]);
694
	percpu_counter_destroy(&sbi->alloc_valid_block_count);
695
	percpu_counter_destroy(&sbi->total_valid_inode_count);
696 697
}

J
Jaegeuk Kim 已提交
698 699 700 701
static void f2fs_put_super(struct super_block *sb)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);

702 703
	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
704
		remove_proc_entry("segment_bits", sbi->s_proc);
705 706
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
707
	kobject_del(&sbi->s_kobj);
708

J
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709 710
	stop_gc_thread(sbi);

711 712 713
	/* prevent remaining shrinker jobs */
	mutex_lock(&sbi->umount_mutex);

714 715 716 717 718
	/*
	 * 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.
	 */
719
	if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
720
			!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
721 722 723 724 725
		struct cp_control cpc = {
			.reason = CP_UMOUNT,
		};
		write_checkpoint(sbi, &cpc);
	}
J
Jaegeuk Kim 已提交
726

J
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727 728 729
	/* write_checkpoint can update stat informaion */
	f2fs_destroy_stats(sbi);

730 731 732 733
	/*
	 * normally superblock is clean, so we need to release this.
	 * In addition, EIO will skip do checkpoint, we need this as well.
	 */
734
	release_ino_entry(sbi, true);
735
	release_discard_addrs(sbi);
736

737 738 739
	f2fs_leave_shrinker(sbi);
	mutex_unlock(&sbi->umount_mutex);

740
	/* our cp_error case, we can wait for any writeback page */
741
	f2fs_flush_merged_bios(sbi);
742

J
Jaegeuk Kim 已提交
743 744 745 746 747 748 749 750
	iput(sbi->node_inode);
	iput(sbi->meta_inode);

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

	kfree(sbi->ckpt);
751 752
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
J
Jaegeuk Kim 已提交
753 754

	sb->s_fs_info = NULL;
K
Keith Mok 已提交
755 756
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
Y
Yunlei He 已提交
757
	kfree(sbi->raw_super);
758 759

	destroy_percpu_info(sbi);
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760 761 762 763 764 765
	kfree(sbi);
}

int f2fs_sync_fs(struct super_block *sb, int sync)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
C
Chao Yu 已提交
766
	int err = 0;
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767

768 769
	trace_f2fs_sync_fs(sb, sync);

770
	if (sync) {
771 772
		struct cp_control cpc;

773 774
		cpc.reason = __get_cp_reason(sbi);

775
		mutex_lock(&sbi->gc_mutex);
C
Chao Yu 已提交
776
		err = write_checkpoint(sbi, &cpc);
777 778
		mutex_unlock(&sbi->gc_mutex);
	}
779
	f2fs_trace_ios(NULL, 1);
J
Jaegeuk Kim 已提交
780

C
Chao Yu 已提交
781
	return err;
J
Jaegeuk Kim 已提交
782 783
}

784 785 786 787
static int f2fs_freeze(struct super_block *sb)
{
	int err;

J
Jaegeuk Kim 已提交
788
	if (f2fs_readonly(sb))
789 790 791 792 793 794 795 796 797 798 799
		return 0;

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

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

J
Jaegeuk Kim 已提交
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817
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);

818 819
	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
820

821
	buf->f_namelen = F2FS_NAME_LEN;
J
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822 823 824 825 826 827 828 829 830 831
	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);

832 833 834 835 836 837
	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 {
838
		seq_printf(seq, ",background_gc=%s", "off");
839
	}
J
Jaegeuk Kim 已提交
840 841 842 843 844 845 846 847 848 849 850
	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
851 852
	if (test_opt(sbi, INLINE_XATTR))
		seq_puts(seq, ",inline_xattr");
J
Jaegeuk Kim 已提交
853 854 855 856 857 858 859 860
#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))
861
		seq_puts(seq, ",disable_ext_identify");
862 863
	if (test_opt(sbi, INLINE_DATA))
		seq_puts(seq, ",inline_data");
W
Wanpeng Li 已提交
864 865
	else
		seq_puts(seq, ",noinline_data");
866 867
	if (test_opt(sbi, INLINE_DENTRY))
		seq_puts(seq, ",inline_dentry");
868
	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
869
		seq_puts(seq, ",flush_merge");
J
Jaegeuk Kim 已提交
870 871
	if (test_opt(sbi, NOBARRIER))
		seq_puts(seq, ",nobarrier");
872 873
	if (test_opt(sbi, FASTBOOT))
		seq_puts(seq, ",fastboot");
874 875
	if (test_opt(sbi, EXTENT_CACHE))
		seq_puts(seq, ",extent_cache");
876 877
	else
		seq_puts(seq, ",noextent_cache");
878 879
	if (test_opt(sbi, DATA_FLUSH))
		seq_puts(seq, ",data_flush");
880 881 882 883 884 885

	seq_puts(seq, ",mode=");
	if (test_opt(sbi, ADAPTIVE))
		seq_puts(seq, "adaptive");
	else if (test_opt(sbi, LFS))
		seq_puts(seq, "lfs");
J
Jaegeuk Kim 已提交
886 887 888 889 890
	seq_printf(seq, ",active_logs=%u", sbi->active_logs);

	return 0;
}

891 892 893 894
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
895 896
	unsigned int total_segs =
			le32_to_cpu(sbi->raw_super->segment_count_main);
897 898
	int i;

899 900 901
	seq_puts(seq, "format: segment_type|valid_blocks\n"
		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

902
	for (i = 0; i < total_segs; i++) {
903 904 905
		struct seg_entry *se = get_seg_entry(sbi, i);

		if ((i % 10) == 0)
Y
Yunlei He 已提交
906
			seq_printf(seq, "%-10d", i);
907 908
		seq_printf(seq, "%d|%-3u", se->type,
					get_valid_blocks(sbi, i, 1));
909 910
		if ((i % 10) == 9 || i == (total_segs - 1))
			seq_putc(seq, '\n');
911
		else
912
			seq_putc(seq, ' ');
913
	}
914

915 916 917
	return 0;
}

918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
static int segment_bits_seq_show(struct seq_file *seq, void *offset)
{
	struct super_block *sb = seq->private;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	unsigned int total_segs =
			le32_to_cpu(sbi->raw_super->segment_count_main);
	int i, j;

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

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

		seq_printf(seq, "%-10d", i);
		seq_printf(seq, "%d|%-3u|", se->type,
					get_valid_blocks(sbi, i, 1));
		for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
			seq_printf(seq, "%x ", se->cur_valid_map[j]);
		seq_putc(seq, '\n');
	}
	return 0;
}

942 943 944 945 946 947 948 949 950 951 952 953
#define F2FS_PROC_FILE_DEF(_name)					\
static int _name##_open_fs(struct inode *inode, struct file *file)	\
{									\
	return single_open(file, _name##_seq_show, PDE_DATA(inode));	\
}									\
									\
static const struct file_operations f2fs_seq_##_name##_fops = {		\
	.owner = THIS_MODULE,						\
	.open = _name##_open_fs,					\
	.read = seq_read,						\
	.llseek = seq_lseek,						\
	.release = single_release,					\
954 955
};

956
F2FS_PROC_FILE_DEF(segment_info);
957
F2FS_PROC_FILE_DEF(segment_bits);
958

959 960 961 962 963 964 965
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);
J
Jaegeuk Kim 已提交
966
	set_opt(sbi, EXTENT_CACHE);
J
Jaegeuk Kim 已提交
967
	sbi->sb->s_flags |= MS_LAZYTIME;
J
Jaegeuk Kim 已提交
968
	set_opt(sbi, FLUSH_MERGE);
969
	set_opt(sbi, ADAPTIVE);
970 971 972 973 974 975 976 977 978

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

979 980 981 982 983
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;
984 985
	bool need_restart_gc = false;
	bool need_stop_gc = false;
986
	bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
987 988 989 990 991 992 993 994

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

995 996 997 998 999 1000 1001 1002 1003
	/* recover superblocks we couldn't write due to previous RO mount */
	if (!(*flags & MS_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
		err = f2fs_commit_super(sbi, false);
		f2fs_msg(sb, KERN_INFO,
			"Try to recover all the superblocks, ret: %d", err);
		if (!err)
			clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
	}

1004
	sbi->mount_opt.opt = 0;
1005
	default_options(sbi);
1006

1007 1008 1009 1010 1011 1012 1013
	/* parse mount options */
	err = parse_options(sb, data);
	if (err)
		goto restore_opts;

	/*
	 * Previous and new state of filesystem is RO,
1014
	 * so skip checking GC and FLUSH_MERGE conditions.
1015
	 */
1016
	if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
1017 1018
		goto skip;

1019 1020 1021 1022 1023 1024 1025 1026
	/* 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;
	}

1027 1028 1029 1030 1031 1032 1033 1034
	/*
	 * 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);
1035
			need_restart_gc = true;
1036
		}
1037
	} else if (!sbi->gc_thread) {
1038 1039 1040
		err = start_gc_thread(sbi);
		if (err)
			goto restore_opts;
1041 1042 1043
		need_stop_gc = true;
	}

1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
	if (*flags & MS_RDONLY) {
		writeback_inodes_sb(sb, WB_REASON_SYNC);
		sync_inodes_sb(sb);

		set_sbi_flag(sbi, SBI_IS_DIRTY);
		set_sbi_flag(sbi, SBI_IS_CLOSE);
		f2fs_sync_fs(sb, 1);
		clear_sbi_flag(sbi, SBI_IS_CLOSE);
	}

1054 1055 1056 1057 1058
	/*
	 * 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)) {
1059
		destroy_flush_cmd_control(sbi);
1060
	} else if (!SM_I(sbi)->cmd_control_info) {
1061 1062
		err = create_flush_cmd_control(sbi);
		if (err)
1063
			goto restore_gc;
1064 1065 1066
	}
skip:
	/* Update the POSIXACL Flag */
1067
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1068
		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1069

1070
	return 0;
1071 1072 1073 1074
restore_gc:
	if (need_restart_gc) {
		if (start_gc_thread(sbi))
			f2fs_msg(sbi->sb, KERN_WARNING,
A
arter97 已提交
1075
				"background gc thread has stopped");
1076 1077 1078
	} else if (need_stop_gc) {
		stop_gc_thread(sbi);
	}
1079 1080 1081 1082 1083 1084
restore_opts:
	sbi->mount_opt = org_mount_opt;
	sbi->active_logs = active_logs;
	return err;
}

J
Jaegeuk Kim 已提交
1085 1086
static struct super_operations f2fs_sops = {
	.alloc_inode	= f2fs_alloc_inode,
1087
	.drop_inode	= f2fs_drop_inode,
J
Jaegeuk Kim 已提交
1088 1089
	.destroy_inode	= f2fs_destroy_inode,
	.write_inode	= f2fs_write_inode,
1090
	.dirty_inode	= f2fs_dirty_inode,
J
Jaegeuk Kim 已提交
1091 1092 1093 1094
	.show_options	= f2fs_show_options,
	.evict_inode	= f2fs_evict_inode,
	.put_super	= f2fs_put_super,
	.sync_fs	= f2fs_sync_fs,
1095 1096
	.freeze_fs	= f2fs_freeze,
	.unfreeze_fs	= f2fs_unfreeze,
J
Jaegeuk Kim 已提交
1097
	.statfs		= f2fs_statfs,
1098
	.remount_fs	= f2fs_remount,
J
Jaegeuk Kim 已提交
1099 1100
};

1101 1102 1103 1104 1105 1106 1107 1108
#ifdef CONFIG_F2FS_FS_ENCRYPTION
static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
{
	return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
				ctx, len, NULL);
}

1109 1110 1111 1112 1113 1114
static int f2fs_key_prefix(struct inode *inode, u8 **key)
{
	*key = F2FS_I_SB(inode)->key_prefix;
	return F2FS_I_SB(inode)->key_prefix_size;
}

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130
static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
							void *fs_data)
{
	return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
				F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
				ctx, len, fs_data, XATTR_CREATE);
}

static unsigned f2fs_max_namelen(struct inode *inode)
{
	return S_ISLNK(inode->i_mode) ?
			inode->i_sb->s_blocksize : F2FS_NAME_LEN;
}

static struct fscrypt_operations f2fs_cryptops = {
	.get_context	= f2fs_get_context,
1131
	.key_prefix	= f2fs_key_prefix,
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142
	.set_context	= f2fs_set_context,
	.is_encrypted	= f2fs_encrypted_inode,
	.empty_dir	= f2fs_empty_dir,
	.max_namelen	= f2fs_max_namelen,
};
#else
static struct fscrypt_operations f2fs_cryptops = {
	.is_encrypted	= f2fs_encrypted_inode,
};
#endif

J
Jaegeuk Kim 已提交
1143 1144 1145 1146 1147 1148
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;

1149
	if (check_nid_range(sbi, ino))
1150
		return ERR_PTR(-ESTALE);
J
Jaegeuk Kim 已提交
1151 1152 1153 1154 1155 1156 1157 1158 1159

	/*
	 * 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);
1160
	if (unlikely(generation && inode->i_generation != generation)) {
J
Jaegeuk Kim 已提交
1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
		/* 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,
};

C
Chao Yu 已提交
1188
static loff_t max_file_blocks(void)
J
Jaegeuk Kim 已提交
1189
{
1190
	loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
J
Jaegeuk Kim 已提交
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206
	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;

	return result;
}

1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
static int __f2fs_commit_super(struct buffer_head *bh,
			struct f2fs_super_block *super)
{
	lock_buffer(bh);
	if (super)
		memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
	set_buffer_uptodate(bh);
	set_buffer_dirty(bh);
	unlock_buffer(bh);

	/* it's rare case, we can do fua all the time */
	return __sync_dirty_buffer(bh, WRITE_FLUSH_FUA);
}

1221
static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
1222
					struct buffer_head *bh)
1223
{
1224 1225
	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
					(bh->b_data + F2FS_SUPER_OFFSET);
1226
	struct super_block *sb = sbi->sb;
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239
	u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
	u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
	u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
	u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
	u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
	u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
	u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
	u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
	u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
	u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
	u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
	u32 segment_count = le32_to_cpu(raw_super->segment_count);
	u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1240 1241 1242 1243
	u64 main_end_blkaddr = main_blkaddr +
				(segment_count_main << log_blocks_per_seg);
	u64 seg_end_blkaddr = segment0_blkaddr +
				(segment_count << log_blocks_per_seg);
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287

	if (segment0_blkaddr != cp_blkaddr) {
		f2fs_msg(sb, KERN_INFO,
			"Mismatch start address, segment0(%u) cp_blkaddr(%u)",
			segment0_blkaddr, cp_blkaddr);
		return true;
	}

	if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
							sit_blkaddr) {
		f2fs_msg(sb, KERN_INFO,
			"Wrong CP boundary, start(%u) end(%u) blocks(%u)",
			cp_blkaddr, sit_blkaddr,
			segment_count_ckpt << log_blocks_per_seg);
		return true;
	}

	if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
							nat_blkaddr) {
		f2fs_msg(sb, KERN_INFO,
			"Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
			sit_blkaddr, nat_blkaddr,
			segment_count_sit << log_blocks_per_seg);
		return true;
	}

	if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
							ssa_blkaddr) {
		f2fs_msg(sb, KERN_INFO,
			"Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
			nat_blkaddr, ssa_blkaddr,
			segment_count_nat << log_blocks_per_seg);
		return true;
	}

	if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
							main_blkaddr) {
		f2fs_msg(sb, KERN_INFO,
			"Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
			ssa_blkaddr, main_blkaddr,
			segment_count_ssa << log_blocks_per_seg);
		return true;
	}

1288
	if (main_end_blkaddr > seg_end_blkaddr) {
1289
		f2fs_msg(sb, KERN_INFO,
1290
			"Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
1291
			main_blkaddr,
1292 1293
			segment0_blkaddr +
				(segment_count << log_blocks_per_seg),
1294 1295
			segment_count_main << log_blocks_per_seg);
		return true;
1296 1297 1298 1299 1300 1301 1302 1303 1304
	} else if (main_end_blkaddr < seg_end_blkaddr) {
		int err = 0;
		char *res;

		/* fix in-memory information all the time */
		raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
				segment0_blkaddr) >> log_blocks_per_seg);

		if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
1305
			set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318
			res = "internally";
		} else {
			err = __f2fs_commit_super(bh, NULL);
			res = err ? "failed" : "done";
		}
		f2fs_msg(sb, KERN_INFO,
			"Fix alignment : %s, start(%u) end(%u) block(%u)",
			res, main_blkaddr,
			segment0_blkaddr +
				(segment_count << log_blocks_per_seg),
			segment_count_main << log_blocks_per_seg);
		if (err)
			return true;
1319 1320 1321 1322
	}
	return false;
}

1323
static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
1324
				struct buffer_head *bh)
J
Jaegeuk Kim 已提交
1325
{
1326 1327
	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
					(bh->b_data + F2FS_SUPER_OFFSET);
1328
	struct super_block *sb = sbi->sb;
J
Jaegeuk Kim 已提交
1329 1330
	unsigned int blocksize;

1331 1332 1333 1334
	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
1335
		return 1;
1336
	}
J
Jaegeuk Kim 已提交
1337

1338
	/* Currently, support only 4KB page cache size */
1339
	if (F2FS_BLKSIZE != PAGE_SIZE) {
1340
		f2fs_msg(sb, KERN_INFO,
1341
			"Invalid page_cache_size (%lu), supports only 4KB\n",
1342
			PAGE_SIZE);
1343 1344 1345
		return 1;
	}

J
Jaegeuk Kim 已提交
1346 1347
	/* Currently, support only 4KB block size */
	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
1348
	if (blocksize != F2FS_BLKSIZE) {
1349 1350 1351
		f2fs_msg(sb, KERN_INFO,
			"Invalid blocksize (%u), supports only 4KB\n",
			blocksize);
J
Jaegeuk Kim 已提交
1352
		return 1;
1353
	}
1354

1355 1356 1357 1358 1359 1360 1361 1362
	/* check log blocks per segment */
	if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
		f2fs_msg(sb, KERN_INFO,
			"Invalid log blocks per segment (%u)\n",
			le32_to_cpu(raw_super->log_blocks_per_seg));
		return 1;
	}

C
Chao Yu 已提交
1363 1364 1365 1366 1367 1368 1369
	/* 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
1370
		return 1;
1371
	}
C
Chao Yu 已提交
1372 1373 1374 1375 1376 1377 1378
	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
1379
		return 1;
1380
	}
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394

	/* check reserved ino info */
	if (le32_to_cpu(raw_super->node_ino) != 1 ||
		le32_to_cpu(raw_super->meta_ino) != 2 ||
		le32_to_cpu(raw_super->root_ino) != 3) {
		f2fs_msg(sb, KERN_INFO,
			"Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
			le32_to_cpu(raw_super->node_ino),
			le32_to_cpu(raw_super->meta_ino),
			le32_to_cpu(raw_super->root_ino));
		return 1;
	}

	/* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
1395
	if (sanity_check_area_boundary(sbi, bh))
1396 1397
		return 1;

J
Jaegeuk Kim 已提交
1398 1399 1400
	return 0;
}

1401
int sanity_check_ckpt(struct f2fs_sb_info *sbi)
J
Jaegeuk Kim 已提交
1402 1403
{
	unsigned int total, fsmeta;
1404 1405
	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
J
Jaegeuk Kim 已提交
1406 1407 1408 1409 1410 1411 1412 1413

	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);

1414
	if (unlikely(fsmeta >= total))
J
Jaegeuk Kim 已提交
1415
		return 1;
1416

1417
	if (unlikely(f2fs_cp_error(sbi))) {
1418 1419 1420
		f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
		return 1;
	}
J
Jaegeuk Kim 已提交
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442
	return 0;
}

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

	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);
1443
	sbi->cur_victim_sec = NULL_SECNO;
1444
	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
J
Jaegeuk Kim 已提交
1445

1446
	sbi->dir_level = DEF_DIR_LEVEL;
1447
	sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
1448
	sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
1449
	clear_sbi_flag(sbi, SBI_NEED_FSCK);
1450 1451 1452

	INIT_LIST_HEAD(&sbi->s_list);
	mutex_init(&sbi->umount_mutex);
1453 1454
	mutex_init(&sbi->wio_mutex[NODE]);
	mutex_init(&sbi->wio_mutex[DATA]);
1455 1456 1457 1458 1459 1460

#ifdef CONFIG_F2FS_FS_ENCRYPTION
	memcpy(sbi->key_prefix, F2FS_KEY_DESC_PREFIX,
				F2FS_KEY_DESC_PREFIX_SIZE);
	sbi->key_prefix_size = F2FS_KEY_DESC_PREFIX_SIZE;
#endif
J
Jaegeuk Kim 已提交
1461 1462
}

1463 1464 1465 1466 1467 1468 1469 1470 1471
static int init_percpu_info(struct f2fs_sb_info *sbi)
{
	int i, err;

	for (i = 0; i < NR_COUNT_TYPE; i++) {
		err = percpu_counter_init(&sbi->nr_pages[i], 0, GFP_KERNEL);
		if (err)
			return err;
	}
1472

1473 1474 1475 1476 1477
	err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
	if (err)
		return err;

	return percpu_counter_init(&sbi->total_valid_inode_count, 0,
1478
								GFP_KERNEL);
1479 1480
}

1481 1482
/*
 * Read f2fs raw super block.
1483 1484 1485
 * Because we have two copies of super block, so read both of them
 * to get the first valid one. If any one of them is broken, we pass
 * them recovery flag back to the caller.
1486
 */
1487
static int read_raw_super_block(struct f2fs_sb_info *sbi,
1488
			struct f2fs_super_block **raw_super,
1489
			int *valid_super_block, int *recovery)
1490
{
1491
	struct super_block *sb = sbi->sb;
1492
	int block;
1493
	struct buffer_head *bh;
1494
	struct f2fs_super_block *super;
1495
	int err = 0;
1496

Y
Yunlei He 已提交
1497 1498 1499
	super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
	if (!super)
		return -ENOMEM;
1500 1501 1502 1503 1504

	for (block = 0; block < 2; block++) {
		bh = sb_bread(sb, block);
		if (!bh) {
			f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1505
				block + 1);
1506 1507 1508
			err = -EIO;
			continue;
		}
1509

1510
		/* sanity checking of raw super */
1511
		if (sanity_check_raw_super(sbi, bh)) {
1512 1513 1514 1515 1516 1517 1518
			f2fs_msg(sb, KERN_ERR,
				"Can't find valid F2FS filesystem in %dth superblock",
				block + 1);
			err = -EINVAL;
			brelse(bh);
			continue;
		}
1519

1520
		if (!*raw_super) {
1521 1522
			memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
							sizeof(*super));
1523 1524 1525 1526
			*valid_super_block = block;
			*raw_super = super;
		}
		brelse(bh);
1527 1528
	}

1529 1530 1531
	/* Fail to read any one of the superblocks*/
	if (err < 0)
		*recovery = 1;
1532 1533

	/* No valid superblock */
1534
	if (!*raw_super)
Y
Yunlei He 已提交
1535
		kfree(super);
1536 1537
	else
		err = 0;
1538

1539
	return err;
1540 1541
}

1542
int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
J
Jaegeuk Kim 已提交
1543
{
J
Jaegeuk Kim 已提交
1544
	struct buffer_head *bh;
J
Jaegeuk Kim 已提交
1545 1546
	int err;

1547 1548 1549
	if ((recover && f2fs_readonly(sbi->sb)) ||
				bdev_read_only(sbi->sb->s_bdev)) {
		set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1550
		return -EROFS;
1551
	}
1552

1553 1554
	/* write back-up superblock first */
	bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0: 1);
J
Jaegeuk Kim 已提交
1555 1556
	if (!bh)
		return -EIO;
1557
	err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
J
Jaegeuk Kim 已提交
1558
	brelse(bh);
C
Chao Yu 已提交
1559 1560 1561

	/* if we are in recovery path, skip writing valid superblock */
	if (recover || err)
J
Jaegeuk Kim 已提交
1562
		return err;
J
Jaegeuk Kim 已提交
1563 1564

	/* write current valid superblock */
1565 1566 1567 1568 1569 1570
	bh = sb_getblk(sbi->sb, sbi->valid_super_block);
	if (!bh)
		return -EIO;
	err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
	brelse(bh);
	return err;
J
Jaegeuk Kim 已提交
1571 1572
}

J
Jaegeuk Kim 已提交
1573 1574 1575
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct f2fs_sb_info *sbi;
1576
	struct f2fs_super_block *raw_super;
J
Jaegeuk Kim 已提交
1577
	struct inode *root;
1578
	int err;
1579
	bool retry = true, need_fsck = false;
1580
	char *options = NULL;
1581
	int recovery, i, valid_super_block;
1582
	struct curseg_info *seg_i;
J
Jaegeuk Kim 已提交
1583

1584
try_onemore:
1585 1586
	err = -EINVAL;
	raw_super = NULL;
1587
	valid_super_block = -1;
1588 1589
	recovery = 0;

J
Jaegeuk Kim 已提交
1590 1591 1592 1593 1594
	/* allocate memory for f2fs-specific super block info */
	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

1595 1596
	sbi->sb = sb;

K
Keith Mok 已提交
1597 1598 1599 1600 1601 1602 1603 1604 1605
	/* Load the checksum driver */
	sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
	if (IS_ERR(sbi->s_chksum_driver)) {
		f2fs_msg(sb, KERN_ERR, "Cannot load crc32 driver.");
		err = PTR_ERR(sbi->s_chksum_driver);
		sbi->s_chksum_driver = NULL;
		goto free_sbi;
	}

1606
	/* set a block size */
1607
	if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1608
		f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
J
Jaegeuk Kim 已提交
1609
		goto free_sbi;
1610
	}
J
Jaegeuk Kim 已提交
1611

1612
	err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
1613
								&recovery);
1614 1615 1616
	if (err)
		goto free_sbi;

1617
	sb->s_fs_info = sbi;
1618
	default_options(sbi);
J
Jaegeuk Kim 已提交
1619
	/* parse mount options */
1620 1621 1622
	options = kstrdup((const char *)data, GFP_KERNEL);
	if (data && !options) {
		err = -ENOMEM;
J
Jaegeuk Kim 已提交
1623
		goto free_sb_buf;
1624 1625 1626 1627 1628
	}

	err = parse_options(sb, options);
	if (err)
		goto free_options;
J
Jaegeuk Kim 已提交
1629

C
Chao Yu 已提交
1630 1631 1632
	sbi->max_file_blocks = max_file_blocks();
	sb->s_maxbytes = sbi->max_file_blocks <<
				le32_to_cpu(raw_super->log_blocksize);
J
Jaegeuk Kim 已提交
1633 1634 1635 1636
	sb->s_max_links = F2FS_LINK_MAX;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));

	sb->s_op = &f2fs_sops;
1637
	sb->s_cop = &f2fs_cryptops;
J
Jaegeuk Kim 已提交
1638 1639 1640 1641 1642 1643 1644 1645 1646 1647
	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->raw_super = raw_super;
1648
	sbi->valid_super_block = valid_super_block;
J
Jaegeuk Kim 已提交
1649 1650
	mutex_init(&sbi->gc_mutex);
	mutex_init(&sbi->cp_mutex);
1651
	init_rwsem(&sbi->node_write);
1652 1653 1654

	/* disallow all the data/node/meta page writes */
	set_sbi_flag(sbi, SBI_POR_DOING);
J
Jaegeuk Kim 已提交
1655
	spin_lock_init(&sbi->stat_lock);
1656

1657
	init_rwsem(&sbi->read_io.io_rwsem);
J
Jaegeuk Kim 已提交
1658 1659 1660
	sbi->read_io.sbi = sbi;
	sbi->read_io.bio = NULL;
	for (i = 0; i < NR_PAGE_TYPE; i++) {
1661
		init_rwsem(&sbi->write_io[i].io_rwsem);
J
Jaegeuk Kim 已提交
1662 1663 1664
		sbi->write_io[i].sbi = sbi;
		sbi->write_io[i].bio = NULL;
	}
1665

1666
	init_rwsem(&sbi->cp_rwsem);
1667
	init_waitqueue_head(&sbi->cp_wait);
J
Jaegeuk Kim 已提交
1668 1669
	init_sb_info(sbi);

1670 1671 1672 1673
	err = init_percpu_info(sbi);
	if (err)
		goto free_options;

J
Jaegeuk Kim 已提交
1674 1675 1676
	/* get an inode for meta space */
	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
	if (IS_ERR(sbi->meta_inode)) {
1677
		f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
J
Jaegeuk Kim 已提交
1678
		err = PTR_ERR(sbi->meta_inode);
1679
		goto free_options;
J
Jaegeuk Kim 已提交
1680 1681 1682
	}

	err = get_valid_checkpoint(sbi);
1683 1684
	if (err) {
		f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
J
Jaegeuk Kim 已提交
1685
		goto free_meta_inode;
1686
	}
J
Jaegeuk Kim 已提交
1687 1688 1689

	sbi->total_valid_node_count =
				le32_to_cpu(sbi->ckpt->valid_node_count);
1690 1691
	percpu_counter_set(&sbi->total_valid_inode_count,
				le32_to_cpu(sbi->ckpt->valid_inode_count));
J
Jaegeuk Kim 已提交
1692 1693 1694 1695
	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;
1696

1697 1698 1699 1700
	for (i = 0; i < NR_INODE_TYPE; i++) {
		INIT_LIST_HEAD(&sbi->inode_list[i]);
		spin_lock_init(&sbi->inode_lock[i]);
	}
J
Jaegeuk Kim 已提交
1701

C
Chao Yu 已提交
1702 1703
	init_extent_cache_info(sbi);

J
Jaegeuk Kim 已提交
1704
	init_ino_entry_info(sbi);
J
Jaegeuk Kim 已提交
1705 1706 1707

	/* setup f2fs internal modules */
	err = build_segment_manager(sbi);
1708 1709 1710
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS segment manager");
J
Jaegeuk Kim 已提交
1711
		goto free_sm;
1712
	}
J
Jaegeuk Kim 已提交
1713
	err = build_node_manager(sbi);
1714 1715 1716
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS node manager");
J
Jaegeuk Kim 已提交
1717
		goto free_nm;
1718
	}
J
Jaegeuk Kim 已提交
1719

1720 1721 1722 1723 1724 1725 1726 1727 1728
	/* For write statistics */
	if (sb->s_bdev->bd_part)
		sbi->sectors_written_start =
			(u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);

	/* Read accumulated write IO statistics if exists */
	seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
	if (__exist_node_summaries(sbi))
		sbi->kbytes_written =
1729
			le64_to_cpu(seg_i->journal->info.kbytes_written);
1730

J
Jaegeuk Kim 已提交
1731 1732 1733 1734 1735
	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)) {
1736
		f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
J
Jaegeuk Kim 已提交
1737 1738 1739 1740
		err = PTR_ERR(sbi->node_inode);
		goto free_nm;
	}

1741 1742
	f2fs_join_shrinker(sbi);

J
Jaegeuk Kim 已提交
1743
	/* if there are nt orphan nodes free them */
1744 1745 1746
	err = recover_orphan_inodes(sbi);
	if (err)
		goto free_node_inode;
J
Jaegeuk Kim 已提交
1747 1748 1749 1750

	/* read root inode and dentry */
	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
	if (IS_ERR(root)) {
1751
		f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
J
Jaegeuk Kim 已提交
1752 1753 1754
		err = PTR_ERR(root);
		goto free_node_inode;
	}
1755
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1756
		iput(root);
1757
		err = -EINVAL;
1758
		goto free_node_inode;
1759
	}
J
Jaegeuk Kim 已提交
1760 1761 1762 1763 1764 1765 1766 1767 1768

	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)
1769
		goto free_root_inode;
J
Jaegeuk Kim 已提交
1770

1771 1772 1773
	if (f2fs_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

1774
	if (sbi->s_proc) {
1775 1776
		proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
				 &f2fs_seq_segment_info_fops, sb);
1777 1778 1779
		proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
				 &f2fs_seq_segment_bits_fops, sb);
	}
1780

1781 1782 1783 1784 1785
	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)
1786
		goto free_proc;
1787

1788 1789
	/* recover fsynced data */
	if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1790 1791 1792 1793 1794 1795 1796 1797 1798
		/*
		 * 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;
		}
1799 1800 1801 1802

		if (need_fsck)
			set_sbi_flag(sbi, SBI_NEED_FSCK);

1803 1804
		err = recover_fsync_data(sbi, false);
		if (err < 0) {
1805
			need_fsck = true;
1806
			f2fs_msg(sb, KERN_ERR,
1807
				"Cannot recover all fsync data errno=%d", err);
1808 1809
			goto free_kobj;
		}
1810 1811 1812 1813 1814 1815 1816 1817 1818
	} else {
		err = recover_fsync_data(sbi, true);

		if (!f2fs_readonly(sb) && err > 0) {
			err = -EINVAL;
			f2fs_msg(sb, KERN_ERR,
				"Need to recover fsync data");
			goto free_kobj;
		}
1819
	}
1820

1821 1822
	/* recover_fsync_data() cleared this already */
	clear_sbi_flag(sbi, SBI_POR_DOING);
1823

1824 1825 1826 1827
	/*
	 * If filesystem is not mounted as read-only then
	 * do start the gc_thread.
	 */
1828
	if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1829 1830 1831 1832 1833
		/* After POR, we can run background GC thread.*/
		err = start_gc_thread(sbi);
		if (err)
			goto free_kobj;
	}
1834
	kfree(options);
1835 1836

	/* recover broken superblock */
1837
	if (recovery) {
1838 1839
		err = f2fs_commit_super(sbi, true);
		f2fs_msg(sb, KERN_INFO,
1840
			"Try to recover %dth superblock, ret: %d",
1841
			sbi->valid_super_block ? 1 : 2, err);
1842 1843
	}

1844
	f2fs_update_time(sbi, CP_TIME);
1845
	f2fs_update_time(sbi, REQ_TIME);
J
Jaegeuk Kim 已提交
1846
	return 0;
1847 1848

free_kobj:
1849
	f2fs_sync_inode_meta(sbi);
1850
	kobject_del(&sbi->s_kobj);
1851 1852
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
1853
free_proc:
1854 1855
	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
1856
		remove_proc_entry("segment_bits", sbi->s_proc);
1857 1858 1859
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
	f2fs_destroy_stats(sbi);
J
Jaegeuk Kim 已提交
1860 1861 1862 1863
free_root_inode:
	dput(sb->s_root);
	sb->s_root = NULL;
free_node_inode:
1864 1865
	mutex_lock(&sbi->umount_mutex);
	f2fs_leave_shrinker(sbi);
J
Jaegeuk Kim 已提交
1866
	iput(sbi->node_inode);
1867
	mutex_unlock(&sbi->umount_mutex);
J
Jaegeuk Kim 已提交
1868 1869 1870 1871 1872 1873 1874 1875
free_nm:
	destroy_node_manager(sbi);
free_sm:
	destroy_segment_manager(sbi);
	kfree(sbi->ckpt);
free_meta_inode:
	make_bad_inode(sbi->meta_inode);
	iput(sbi->meta_inode);
1876
free_options:
1877
	destroy_percpu_info(sbi);
1878
	kfree(options);
J
Jaegeuk Kim 已提交
1879
free_sb_buf:
Y
Yunlei He 已提交
1880
	kfree(raw_super);
J
Jaegeuk Kim 已提交
1881
free_sbi:
K
Keith Mok 已提交
1882 1883
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
J
Jaegeuk Kim 已提交
1884
	kfree(sbi);
1885 1886 1887

	/* give only one another chance */
	if (retry) {
1888
		retry = false;
1889 1890 1891
		shrink_dcache_sb(sb);
		goto try_onemore;
	}
J
Jaegeuk Kim 已提交
1892 1893 1894 1895 1896 1897 1898 1899 1900
	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);
}

1901 1902 1903
static void kill_f2fs_super(struct super_block *sb)
{
	if (sb->s_root)
1904
		set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1905 1906 1907
	kill_block_super(sb);
}

J
Jaegeuk Kim 已提交
1908 1909 1910 1911
static struct file_system_type f2fs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "f2fs",
	.mount		= f2fs_mount,
1912
	.kill_sb	= kill_f2fs_super,
J
Jaegeuk Kim 已提交
1913 1914
	.fs_flags	= FS_REQUIRES_DEV,
};
1915
MODULE_ALIAS_FS("f2fs");
J
Jaegeuk Kim 已提交
1916

1917
static int __init init_inodecache(void)
J
Jaegeuk Kim 已提交
1918
{
1919 1920 1921
	f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
			sizeof(struct f2fs_inode_info), 0,
			SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
1922
	if (!f2fs_inode_cachep)
J
Jaegeuk Kim 已提交
1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940
		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;

1941 1942
	f2fs_build_trace_ios();

J
Jaegeuk Kim 已提交
1943 1944 1945 1946 1947
	err = init_inodecache();
	if (err)
		goto fail;
	err = create_node_manager_caches();
	if (err)
1948
		goto free_inodecache;
1949
	err = create_segment_manager_caches();
J
Jaegeuk Kim 已提交
1950
	if (err)
1951
		goto free_node_manager_caches;
J
Jaegeuk Kim 已提交
1952 1953
	err = create_checkpoint_caches();
	if (err)
1954
		goto free_segment_manager_caches;
C
Chao Yu 已提交
1955 1956 1957
	err = create_extent_cache();
	if (err)
		goto free_checkpoint_caches;
1958
	f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1959 1960
	if (!f2fs_kset) {
		err = -ENOMEM;
C
Chao Yu 已提交
1961
		goto free_extent_cache;
1962
	}
S
Sheng Yong 已提交
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972
#ifdef CONFIG_F2FS_FAULT_INJECTION
	f2fs_fault_inject.kset = f2fs_kset;
	f2fs_build_fault_attr(0);
	err = kobject_init_and_add(&f2fs_fault_inject, &f2fs_fault_ktype,
				NULL, "fault_injection");
	if (err) {
		f2fs_fault_inject.kset = NULL;
		goto free_kset;
	}
#endif
1973
	err = register_shrinker(&f2fs_shrinker_info);
1974
	if (err)
1975
		goto free_kset;
1976 1977 1978 1979

	err = register_filesystem(&f2fs_fs_type);
	if (err)
		goto free_shrinker;
1980 1981 1982
	err = f2fs_create_root_stats();
	if (err)
		goto free_filesystem;
1983
	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1984 1985
	return 0;

1986 1987
free_filesystem:
	unregister_filesystem(&f2fs_fs_type);
1988 1989
free_shrinker:
	unregister_shrinker(&f2fs_shrinker_info);
1990
free_kset:
S
Sheng Yong 已提交
1991 1992 1993 1994
#ifdef CONFIG_F2FS_FAULT_INJECTION
	if (f2fs_fault_inject.kset)
		kobject_put(&f2fs_fault_inject);
#endif
1995
	kset_unregister(f2fs_kset);
C
Chao Yu 已提交
1996 1997
free_extent_cache:
	destroy_extent_cache();
1998 1999
free_checkpoint_caches:
	destroy_checkpoint_caches();
2000 2001
free_segment_manager_caches:
	destroy_segment_manager_caches();
2002 2003 2004 2005
free_node_manager_caches:
	destroy_node_manager_caches();
free_inodecache:
	destroy_inodecache();
J
Jaegeuk Kim 已提交
2006 2007 2008 2009 2010 2011
fail:
	return err;
}

static void __exit exit_f2fs_fs(void)
{
2012
	remove_proc_entry("fs/f2fs", NULL);
2013
	f2fs_destroy_root_stats();
J
Jaegeuk Kim 已提交
2014
	unregister_filesystem(&f2fs_fs_type);
T
Tiezhu Yang 已提交
2015 2016 2017 2018 2019
	unregister_shrinker(&f2fs_shrinker_info);
#ifdef CONFIG_F2FS_FAULT_INJECTION
	kobject_put(&f2fs_fault_inject);
#endif
	kset_unregister(f2fs_kset);
W
Wanpeng Li 已提交
2020
	destroy_extent_cache();
J
Jaegeuk Kim 已提交
2021
	destroy_checkpoint_caches();
2022
	destroy_segment_manager_caches();
J
Jaegeuk Kim 已提交
2023 2024
	destroy_node_manager_caches();
	destroy_inodecache();
2025
	f2fs_destroy_trace_ios();
J
Jaegeuk Kim 已提交
2026 2027 2028 2029 2030 2031 2032 2033
}

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");