super.c 51.4 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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#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_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_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_fault_injection:
			if (args->from && match_int(args, &arg))
				return -EINVAL;
#ifdef CONFIG_F2FS_FAULT_INJECTION
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			f2fs_build_fault_attr(arg);
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#else
			f2fs_msg(sb, KERN_INFO,
				"FAULT_INJECTION was not selected");
#endif
			break;
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		case Opt_lazytime:
			sb->s_flags |= MS_LAZYTIME;
			break;
		case Opt_nolazytime:
			sb->s_flags &= ~MS_LAZYTIME;
			break;
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		default:
			f2fs_msg(sb, KERN_ERR,
				"Unrecognized mount option \"%s\" or missing value",
				p);
			return -EINVAL;
		}
	}
	return 0;
}

J
Jaegeuk Kim 已提交
535 536 537 538
static struct inode *f2fs_alloc_inode(struct super_block *sb)
{
	struct f2fs_inode_info *fi;

539
	fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
J
Jaegeuk Kim 已提交
540 541 542 543 544
	if (!fi)
		return NULL;

	init_once((void *) fi);

545 546 547 548 549
	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
550
	/* Initialize f2fs-specific inode info */
J
Jaegeuk Kim 已提交
551 552 553
	fi->vfs_inode.i_version = 1;
	fi->i_current_depth = 1;
	fi->i_advise = 0;
554
	init_rwsem(&fi->i_sem);
555
	INIT_LIST_HEAD(&fi->dirty_list);
556
	INIT_LIST_HEAD(&fi->gdirty_list);
J
Jaegeuk Kim 已提交
557 558
	INIT_LIST_HEAD(&fi->inmem_pages);
	mutex_init(&fi->inmem_lock);
J
Jaegeuk Kim 已提交
559

560 561
	/* Will be used by directory only */
	fi->i_dir_level = F2FS_SB(sb)->dir_level;
J
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562 563 564
	return &fi->vfs_inode;
}

565 566
static int f2fs_drop_inode(struct inode *inode)
{
567 568
	int ret;

569 570 571 572 573 574 575
	/*
	 * 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)
	 */
576
	if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
577
		if (!inode->i_nlink && !is_bad_inode(inode)) {
J
Jaegeuk Kim 已提交
578 579
			/* to avoid evict_inode call simultaneously */
			atomic_inc(&inode->i_count);
580 581 582 583
			spin_unlock(&inode->i_lock);

			/* some remained atomic pages should discarded */
			if (f2fs_is_atomic_file(inode))
584
				drop_inmem_pages(inode);
585

J
Jaegeuk Kim 已提交
586 587 588
			/* should remain fi->extent_tree for writepage */
			f2fs_destroy_extent_node(inode);

589
			sb_start_intwrite(inode->i_sb);
590
			f2fs_i_size_write(inode, 0);
591 592

			if (F2FS_HAS_BLOCKS(inode))
593
				f2fs_truncate(inode);
594 595 596

			sb_end_intwrite(inode->i_sb);

597
			fscrypt_put_encryption_info(inode, NULL);
598
			spin_lock(&inode->i_lock);
J
Jaegeuk Kim 已提交
599
			atomic_dec(&inode->i_count);
600
		}
601
		return 0;
602
	}
603 604 605 606 607 608 609 610 611 612 613 614 615 616

	ret = generic_drop_inode(inode);
	if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
		if (ret)
			inode->i_state |= I_WILL_FREE;
		spin_unlock(&inode->i_lock);

		update_inode_page(inode);

		spin_lock(&inode->i_lock);
		if (ret)
			inode->i_state &= ~I_WILL_FREE;
	}
	return ret;
617 618
}

619 620 621 622 623 624 625
/*
 * 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)
{
626 627 628 629 630 631
	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
632 633 634
	if (flags == I_DIRTY_TIME)
		return;

635 636 637
	if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
		clear_inode_flag(inode, FI_AUTO_RECOVER);

638 639 640 641 642 643
	spin_lock(&sbi->inode_lock[DIRTY_META]);
	if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
		spin_unlock(&sbi->inode_lock[DIRTY_META]);
		return;
	}

644
	set_inode_flag(inode, FI_DIRTY_INODE);
645 646 647 648
	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);
649
	spin_unlock(&sbi->inode_lock[DIRTY_META]);
650 651 652 653 654 655 656 657 658 659 660 661 662
}

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);
663
	clear_inode_flag(inode, FI_AUTO_RECOVER);
664 665
	dec_page_count(sbi, F2FS_DIRTY_IMETA);
	stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
666
	spin_unlock(&sbi->inode_lock[DIRTY_META]);
667 668
}

J
Jaegeuk Kim 已提交
669 670 671 672 673 674
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));
}

675
static void f2fs_destroy_inode(struct inode *inode)
J
Jaegeuk Kim 已提交
676
{
677
	percpu_counter_destroy(&F2FS_I(inode)->dirty_pages);
J
Jaegeuk Kim 已提交
678 679 680
	call_rcu(&inode->i_rcu, f2fs_i_callback);
}

681 682 683 684 685 686
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]);
687
	percpu_counter_destroy(&sbi->alloc_valid_block_count);
688
	percpu_counter_destroy(&sbi->total_valid_inode_count);
689 690
}

J
Jaegeuk Kim 已提交
691 692 693 694
static void f2fs_put_super(struct super_block *sb)
{
	struct f2fs_sb_info *sbi = F2FS_SB(sb);

695 696
	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
697
		remove_proc_entry("segment_bits", sbi->s_proc);
698 699
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
700
	kobject_del(&sbi->s_kobj);
701

J
Jaegeuk Kim 已提交
702 703
	stop_gc_thread(sbi);

704 705 706
	/* prevent remaining shrinker jobs */
	mutex_lock(&sbi->umount_mutex);

707 708 709 710 711
	/*
	 * 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.
	 */
712
	if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
713
			!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
714 715 716 717 718
		struct cp_control cpc = {
			.reason = CP_UMOUNT,
		};
		write_checkpoint(sbi, &cpc);
	}
J
Jaegeuk Kim 已提交
719

J
Jaegeuk Kim 已提交
720 721 722
	/* write_checkpoint can update stat informaion */
	f2fs_destroy_stats(sbi);

723 724 725 726
	/*
	 * normally superblock is clean, so we need to release this.
	 * In addition, EIO will skip do checkpoint, we need this as well.
	 */
727
	release_ino_entry(sbi, true);
728
	release_discard_addrs(sbi);
729

730 731 732
	f2fs_leave_shrinker(sbi);
	mutex_unlock(&sbi->umount_mutex);

733
	/* our cp_error case, we can wait for any writeback page */
734
	f2fs_flush_merged_bios(sbi);
735

J
Jaegeuk Kim 已提交
736 737 738 739 740 741 742 743
	iput(sbi->node_inode);
	iput(sbi->meta_inode);

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

	kfree(sbi->ckpt);
744 745
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
J
Jaegeuk Kim 已提交
746 747

	sb->s_fs_info = NULL;
K
Keith Mok 已提交
748 749
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
Y
Yunlei He 已提交
750
	kfree(sbi->raw_super);
751 752

	destroy_percpu_info(sbi);
J
Jaegeuk Kim 已提交
753 754 755 756 757 758
	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
759
	int err = 0;
J
Jaegeuk Kim 已提交
760

761 762
	trace_f2fs_sync_fs(sb, sync);

763
	if (sync) {
764 765
		struct cp_control cpc;

766 767
		cpc.reason = __get_cp_reason(sbi);

768
		mutex_lock(&sbi->gc_mutex);
C
Chao Yu 已提交
769
		err = write_checkpoint(sbi, &cpc);
770 771
		mutex_unlock(&sbi->gc_mutex);
	}
772
	f2fs_trace_ios(NULL, 1);
J
Jaegeuk Kim 已提交
773

C
Chao Yu 已提交
774
	return err;
J
Jaegeuk Kim 已提交
775 776
}

777 778 779 780
static int f2fs_freeze(struct super_block *sb)
{
	int err;

J
Jaegeuk Kim 已提交
781
	if (f2fs_readonly(sb))
782 783 784 785 786 787 788 789 790 791 792
		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
793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
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);

811 812
	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
813

814
	buf->f_namelen = F2FS_NAME_LEN;
J
Jaegeuk Kim 已提交
815 816 817 818 819 820 821 822 823 824
	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);

825 826 827 828 829 830
	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 {
831
		seq_printf(seq, ",background_gc=%s", "off");
832
	}
J
Jaegeuk Kim 已提交
833 834 835 836 837 838 839 840 841 842 843
	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
844 845
	if (test_opt(sbi, INLINE_XATTR))
		seq_puts(seq, ",inline_xattr");
J
Jaegeuk Kim 已提交
846 847 848 849 850 851 852 853
#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))
854
		seq_puts(seq, ",disable_ext_identify");
855 856
	if (test_opt(sbi, INLINE_DATA))
		seq_puts(seq, ",inline_data");
W
Wanpeng Li 已提交
857 858
	else
		seq_puts(seq, ",noinline_data");
859 860
	if (test_opt(sbi, INLINE_DENTRY))
		seq_puts(seq, ",inline_dentry");
861
	if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
862
		seq_puts(seq, ",flush_merge");
J
Jaegeuk Kim 已提交
863 864
	if (test_opt(sbi, NOBARRIER))
		seq_puts(seq, ",nobarrier");
865 866
	if (test_opt(sbi, FASTBOOT))
		seq_puts(seq, ",fastboot");
867 868
	if (test_opt(sbi, EXTENT_CACHE))
		seq_puts(seq, ",extent_cache");
869 870
	else
		seq_puts(seq, ",noextent_cache");
871 872
	if (test_opt(sbi, DATA_FLUSH))
		seq_puts(seq, ",data_flush");
J
Jaegeuk Kim 已提交
873 874 875 876 877
	seq_printf(seq, ",active_logs=%u", sbi->active_logs);

	return 0;
}

878 879 880 881
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
882 883
	unsigned int total_segs =
			le32_to_cpu(sbi->raw_super->segment_count_main);
884 885
	int i;

886 887 888
	seq_puts(seq, "format: segment_type|valid_blocks\n"
		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

889
	for (i = 0; i < total_segs; i++) {
890 891 892
		struct seg_entry *se = get_seg_entry(sbi, i);

		if ((i % 10) == 0)
Y
Yunlei He 已提交
893
			seq_printf(seq, "%-10d", i);
894 895
		seq_printf(seq, "%d|%-3u", se->type,
					get_valid_blocks(sbi, i, 1));
896 897
		if ((i % 10) == 9 || i == (total_segs - 1))
			seq_putc(seq, '\n');
898
		else
899
			seq_putc(seq, ' ');
900
	}
901

902 903 904
	return 0;
}

905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
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;
}

929 930 931 932 933 934 935 936 937 938 939 940
#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,					\
941 942
};

943
F2FS_PROC_FILE_DEF(segment_info);
944
F2FS_PROC_FILE_DEF(segment_bits);
945

946 947 948 949 950 951 952
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
953
	set_opt(sbi, EXTENT_CACHE);
J
Jaegeuk Kim 已提交
954
	sbi->sb->s_flags |= MS_LAZYTIME;
J
Jaegeuk Kim 已提交
955
	set_opt(sbi, FLUSH_MERGE);
956 957 958 959 960 961 962 963 964

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

965 966 967 968 969
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;
970 971
	bool need_restart_gc = false;
	bool need_stop_gc = false;
972
	bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
973 974 975 976 977 978 979 980

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

981 982 983 984 985 986 987 988 989
	/* 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);
	}

990
	sbi->mount_opt.opt = 0;
991
	default_options(sbi);
992

993 994 995 996 997 998 999
	/* parse mount options */
	err = parse_options(sb, data);
	if (err)
		goto restore_opts;

	/*
	 * Previous and new state of filesystem is RO,
1000
	 * so skip checking GC and FLUSH_MERGE conditions.
1001
	 */
1002
	if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
1003 1004
		goto skip;

1005 1006 1007 1008 1009 1010 1011 1012
	/* 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;
	}

1013 1014 1015 1016 1017 1018 1019 1020
	/*
	 * 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);
1021
			need_restart_gc = true;
1022
		}
1023
	} else if (!sbi->gc_thread) {
1024 1025 1026
		err = start_gc_thread(sbi);
		if (err)
			goto restore_opts;
1027 1028 1029
		need_stop_gc = true;
	}

1030 1031 1032 1033 1034 1035 1036 1037 1038 1039
	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);
	}

1040 1041 1042 1043 1044
	/*
	 * 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)) {
1045
		destroy_flush_cmd_control(sbi);
1046
	} else if (!SM_I(sbi)->cmd_control_info) {
1047 1048
		err = create_flush_cmd_control(sbi);
		if (err)
1049
			goto restore_gc;
1050 1051 1052
	}
skip:
	/* Update the POSIXACL Flag */
1053
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1054
		(test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1055

1056
	return 0;
1057 1058 1059 1060
restore_gc:
	if (need_restart_gc) {
		if (start_gc_thread(sbi))
			f2fs_msg(sbi->sb, KERN_WARNING,
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1061
				"background gc thread has stopped");
1062 1063 1064
	} else if (need_stop_gc) {
		stop_gc_thread(sbi);
	}
1065 1066 1067 1068 1069 1070
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,
1073
	.drop_inode	= f2fs_drop_inode,
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	.destroy_inode	= f2fs_destroy_inode,
	.write_inode	= f2fs_write_inode,
1076
	.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,
1081 1082
	.freeze_fs	= f2fs_freeze,
	.unfreeze_fs	= f2fs_unfreeze,
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	.statfs		= f2fs_statfs,
1084
	.remount_fs	= f2fs_remount,
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};

1087 1088 1089 1090 1091 1092 1093 1094
#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);
}

1095 1096 1097 1098 1099 1100
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;
}

1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
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,
1117
	.key_prefix	= f2fs_key_prefix,
1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
	.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

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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;

1135
	if (check_nid_range(sbi, ino))
1136
		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);
1146
	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,
};

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static loff_t max_file_blocks(void)
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{
1176
	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;

	return result;
}

1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206
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);
}

1207
static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
1208
					struct buffer_head *bh)
1209
{
1210 1211
	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
					(bh->b_data + F2FS_SUPER_OFFSET);
1212
	struct super_block *sb = sbi->sb;
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
	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);
1226 1227 1228 1229
	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);
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 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

	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;
	}

1274
	if (main_end_blkaddr > seg_end_blkaddr) {
1275
		f2fs_msg(sb, KERN_INFO,
1276
			"Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
1277
			main_blkaddr,
1278 1279
			segment0_blkaddr +
				(segment_count << log_blocks_per_seg),
1280 1281
			segment_count_main << log_blocks_per_seg);
		return true;
1282 1283 1284 1285 1286 1287 1288 1289 1290
	} 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)) {
1291
			set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304
			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;
1305 1306 1307 1308
	}
	return false;
}

1309
static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
1310
				struct buffer_head *bh)
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1311
{
1312 1313
	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
					(bh->b_data + F2FS_SUPER_OFFSET);
1314
	struct super_block *sb = sbi->sb;
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1315 1316
	unsigned int blocksize;

1317 1318 1319 1320
	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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1321
		return 1;
1322
	}
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1323

1324
	/* Currently, support only 4KB page cache size */
1325
	if (F2FS_BLKSIZE != PAGE_SIZE) {
1326
		f2fs_msg(sb, KERN_INFO,
1327
			"Invalid page_cache_size (%lu), supports only 4KB\n",
1328
			PAGE_SIZE);
1329 1330 1331
		return 1;
	}

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1332 1333
	/* Currently, support only 4KB block size */
	blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
1334
	if (blocksize != F2FS_BLKSIZE) {
1335 1336 1337
		f2fs_msg(sb, KERN_INFO,
			"Invalid blocksize (%u), supports only 4KB\n",
			blocksize);
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1338
		return 1;
1339
	}
1340

1341 1342 1343 1344 1345 1346 1347 1348
	/* 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;
	}

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1349 1350 1351 1352 1353 1354 1355
	/* 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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1356
		return 1;
1357
	}
C
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1358 1359 1360 1361 1362 1363 1364
	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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1365
		return 1;
1366
	}
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380

	/* 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 */
1381
	if (sanity_check_area_boundary(sbi, bh))
1382 1383
		return 1;

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1384 1385 1386
	return 0;
}

1387
int sanity_check_ckpt(struct f2fs_sb_info *sbi)
J
Jaegeuk Kim 已提交
1388 1389
{
	unsigned int total, fsmeta;
1390 1391
	struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
	struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
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1392 1393 1394 1395 1396 1397 1398 1399

	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);

1400
	if (unlikely(fsmeta >= total))
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Jaegeuk Kim 已提交
1401
		return 1;
1402

1403
	if (unlikely(f2fs_cp_error(sbi))) {
1404 1405 1406
		f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
		return 1;
	}
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1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
	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);
1429
	sbi->cur_victim_sec = NULL_SECNO;
1430
	sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
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1431

1432
	sbi->dir_level = DEF_DIR_LEVEL;
1433
	sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
1434
	sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
1435
	clear_sbi_flag(sbi, SBI_NEED_FSCK);
1436 1437 1438

	INIT_LIST_HEAD(&sbi->s_list);
	mutex_init(&sbi->umount_mutex);
1439 1440 1441 1442 1443 1444

#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
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1445 1446
}

1447 1448 1449 1450 1451 1452 1453 1454 1455
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;
	}
1456

1457 1458 1459 1460 1461
	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,
1462
								GFP_KERNEL);
1463 1464
}

1465 1466
/*
 * Read f2fs raw super block.
1467 1468 1469
 * 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.
1470
 */
1471
static int read_raw_super_block(struct f2fs_sb_info *sbi,
1472
			struct f2fs_super_block **raw_super,
1473
			int *valid_super_block, int *recovery)
1474
{
1475
	struct super_block *sb = sbi->sb;
1476
	int block;
1477
	struct buffer_head *bh;
1478
	struct f2fs_super_block *super;
1479
	int err = 0;
1480

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Yunlei He 已提交
1481 1482 1483
	super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
	if (!super)
		return -ENOMEM;
1484 1485 1486 1487 1488

	for (block = 0; block < 2; block++) {
		bh = sb_bread(sb, block);
		if (!bh) {
			f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1489
				block + 1);
1490 1491 1492
			err = -EIO;
			continue;
		}
1493

1494
		/* sanity checking of raw super */
1495
		if (sanity_check_raw_super(sbi, bh)) {
1496 1497 1498 1499 1500 1501 1502
			f2fs_msg(sb, KERN_ERR,
				"Can't find valid F2FS filesystem in %dth superblock",
				block + 1);
			err = -EINVAL;
			brelse(bh);
			continue;
		}
1503

1504
		if (!*raw_super) {
1505 1506
			memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
							sizeof(*super));
1507 1508 1509 1510
			*valid_super_block = block;
			*raw_super = super;
		}
		brelse(bh);
1511 1512
	}

1513 1514 1515
	/* Fail to read any one of the superblocks*/
	if (err < 0)
		*recovery = 1;
1516 1517

	/* No valid superblock */
1518
	if (!*raw_super)
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Yunlei He 已提交
1519
		kfree(super);
1520 1521
	else
		err = 0;
1522

1523
	return err;
1524 1525
}

1526
int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
J
Jaegeuk Kim 已提交
1527
{
J
Jaegeuk Kim 已提交
1528
	struct buffer_head *bh;
J
Jaegeuk Kim 已提交
1529 1530
	int err;

1531 1532 1533
	if ((recover && f2fs_readonly(sbi->sb)) ||
				bdev_read_only(sbi->sb->s_bdev)) {
		set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1534
		return -EROFS;
1535
	}
1536

1537 1538
	/* write back-up superblock first */
	bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0: 1);
J
Jaegeuk Kim 已提交
1539 1540
	if (!bh)
		return -EIO;
1541
	err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
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Jaegeuk Kim 已提交
1542
	brelse(bh);
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1543 1544 1545

	/* if we are in recovery path, skip writing valid superblock */
	if (recover || err)
J
Jaegeuk Kim 已提交
1546
		return err;
J
Jaegeuk Kim 已提交
1547 1548

	/* write current valid superblock */
1549 1550 1551 1552 1553 1554
	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
1555 1556
}

J
Jaegeuk Kim 已提交
1557 1558 1559
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct f2fs_sb_info *sbi;
1560
	struct f2fs_super_block *raw_super;
J
Jaegeuk Kim 已提交
1561
	struct inode *root;
1562
	int err;
1563
	bool retry = true, need_fsck = false;
1564
	char *options = NULL;
1565
	int recovery, i, valid_super_block;
1566
	struct curseg_info *seg_i;
J
Jaegeuk Kim 已提交
1567

1568
try_onemore:
1569 1570
	err = -EINVAL;
	raw_super = NULL;
1571
	valid_super_block = -1;
1572 1573
	recovery = 0;

J
Jaegeuk Kim 已提交
1574 1575 1576 1577 1578
	/* allocate memory for f2fs-specific super block info */
	sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;

1579 1580
	sbi->sb = sb;

K
Keith Mok 已提交
1581 1582 1583 1584 1585 1586 1587 1588 1589
	/* 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;
	}

1590
	/* set a block size */
1591
	if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1592
		f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
J
Jaegeuk Kim 已提交
1593
		goto free_sbi;
1594
	}
J
Jaegeuk Kim 已提交
1595

1596
	err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
1597
								&recovery);
1598 1599 1600
	if (err)
		goto free_sbi;

1601
	sb->s_fs_info = sbi;
1602
	default_options(sbi);
J
Jaegeuk Kim 已提交
1603
	/* parse mount options */
1604 1605 1606
	options = kstrdup((const char *)data, GFP_KERNEL);
	if (data && !options) {
		err = -ENOMEM;
J
Jaegeuk Kim 已提交
1607
		goto free_sb_buf;
1608 1609 1610 1611 1612
	}

	err = parse_options(sb, options);
	if (err)
		goto free_options;
J
Jaegeuk Kim 已提交
1613

C
Chao Yu 已提交
1614 1615 1616
	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
1617 1618 1619 1620
	sb->s_max_links = F2FS_LINK_MAX;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));

	sb->s_op = &f2fs_sops;
1621
	sb->s_cop = &f2fs_cryptops;
J
Jaegeuk Kim 已提交
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631
	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;
1632
	sbi->valid_super_block = valid_super_block;
J
Jaegeuk Kim 已提交
1633 1634
	mutex_init(&sbi->gc_mutex);
	mutex_init(&sbi->cp_mutex);
1635
	init_rwsem(&sbi->node_write);
1636 1637 1638

	/* disallow all the data/node/meta page writes */
	set_sbi_flag(sbi, SBI_POR_DOING);
J
Jaegeuk Kim 已提交
1639
	spin_lock_init(&sbi->stat_lock);
1640

1641
	init_rwsem(&sbi->read_io.io_rwsem);
J
Jaegeuk Kim 已提交
1642 1643 1644
	sbi->read_io.sbi = sbi;
	sbi->read_io.bio = NULL;
	for (i = 0; i < NR_PAGE_TYPE; i++) {
1645
		init_rwsem(&sbi->write_io[i].io_rwsem);
J
Jaegeuk Kim 已提交
1646 1647 1648
		sbi->write_io[i].sbi = sbi;
		sbi->write_io[i].bio = NULL;
	}
1649

1650
	init_rwsem(&sbi->cp_rwsem);
1651
	init_waitqueue_head(&sbi->cp_wait);
J
Jaegeuk Kim 已提交
1652 1653
	init_sb_info(sbi);

1654 1655 1656 1657
	err = init_percpu_info(sbi);
	if (err)
		goto free_options;

J
Jaegeuk Kim 已提交
1658 1659 1660
	/* get an inode for meta space */
	sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
	if (IS_ERR(sbi->meta_inode)) {
1661
		f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
J
Jaegeuk Kim 已提交
1662
		err = PTR_ERR(sbi->meta_inode);
1663
		goto free_options;
J
Jaegeuk Kim 已提交
1664 1665 1666
	}

	err = get_valid_checkpoint(sbi);
1667 1668
	if (err) {
		f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
J
Jaegeuk Kim 已提交
1669
		goto free_meta_inode;
1670
	}
J
Jaegeuk Kim 已提交
1671 1672 1673

	sbi->total_valid_node_count =
				le32_to_cpu(sbi->ckpt->valid_node_count);
1674 1675
	percpu_counter_set(&sbi->total_valid_inode_count,
				le32_to_cpu(sbi->ckpt->valid_inode_count));
J
Jaegeuk Kim 已提交
1676 1677 1678 1679
	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;
1680

1681 1682 1683 1684
	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
1685

C
Chao Yu 已提交
1686 1687
	init_extent_cache_info(sbi);

J
Jaegeuk Kim 已提交
1688
	init_ino_entry_info(sbi);
J
Jaegeuk Kim 已提交
1689 1690 1691

	/* setup f2fs internal modules */
	err = build_segment_manager(sbi);
1692 1693 1694
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS segment manager");
J
Jaegeuk Kim 已提交
1695
		goto free_sm;
1696
	}
J
Jaegeuk Kim 已提交
1697
	err = build_node_manager(sbi);
1698 1699 1700
	if (err) {
		f2fs_msg(sb, KERN_ERR,
			"Failed to initialize F2FS node manager");
J
Jaegeuk Kim 已提交
1701
		goto free_nm;
1702
	}
J
Jaegeuk Kim 已提交
1703

1704 1705 1706 1707 1708 1709 1710 1711 1712
	/* 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 =
1713
			le64_to_cpu(seg_i->journal->info.kbytes_written);
1714

J
Jaegeuk Kim 已提交
1715 1716 1717 1718 1719
	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)) {
1720
		f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
J
Jaegeuk Kim 已提交
1721 1722 1723 1724
		err = PTR_ERR(sbi->node_inode);
		goto free_nm;
	}

1725 1726
	f2fs_join_shrinker(sbi);

J
Jaegeuk Kim 已提交
1727
	/* if there are nt orphan nodes free them */
1728 1729 1730
	err = recover_orphan_inodes(sbi);
	if (err)
		goto free_node_inode;
J
Jaegeuk Kim 已提交
1731 1732 1733 1734

	/* read root inode and dentry */
	root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
	if (IS_ERR(root)) {
1735
		f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
J
Jaegeuk Kim 已提交
1736 1737 1738
		err = PTR_ERR(root);
		goto free_node_inode;
	}
1739
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1740
		iput(root);
1741
		err = -EINVAL;
1742
		goto free_node_inode;
1743
	}
J
Jaegeuk Kim 已提交
1744 1745 1746 1747 1748 1749 1750 1751 1752

	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)
1753
		goto free_root_inode;
J
Jaegeuk Kim 已提交
1754

1755 1756 1757
	if (f2fs_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

1758
	if (sbi->s_proc) {
1759 1760
		proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
				 &f2fs_seq_segment_info_fops, sb);
1761 1762 1763
		proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
				 &f2fs_seq_segment_bits_fops, sb);
	}
1764

1765 1766 1767 1768 1769
	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)
1770
		goto free_proc;
1771

1772 1773
	/* recover fsynced data */
	if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1774 1775 1776 1777 1778 1779 1780 1781 1782
		/*
		 * 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;
		}
1783 1784 1785 1786

		if (need_fsck)
			set_sbi_flag(sbi, SBI_NEED_FSCK);

1787 1788
		err = recover_fsync_data(sbi, false);
		if (err < 0) {
1789
			need_fsck = true;
1790
			f2fs_msg(sb, KERN_ERR,
1791
				"Cannot recover all fsync data errno=%d", err);
1792 1793
			goto free_kobj;
		}
1794 1795 1796 1797 1798 1799 1800 1801 1802
	} 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;
		}
1803
	}
1804

1805 1806
	/* recover_fsync_data() cleared this already */
	clear_sbi_flag(sbi, SBI_POR_DOING);
1807

1808 1809 1810 1811
	/*
	 * If filesystem is not mounted as read-only then
	 * do start the gc_thread.
	 */
1812
	if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1813 1814 1815 1816 1817
		/* After POR, we can run background GC thread.*/
		err = start_gc_thread(sbi);
		if (err)
			goto free_kobj;
	}
1818
	kfree(options);
1819 1820

	/* recover broken superblock */
1821
	if (recovery) {
1822 1823
		err = f2fs_commit_super(sbi, true);
		f2fs_msg(sb, KERN_INFO,
1824
			"Try to recover %dth superblock, ret: %d",
1825
			sbi->valid_super_block ? 1 : 2, err);
1826 1827
	}

1828
	f2fs_update_time(sbi, CP_TIME);
1829
	f2fs_update_time(sbi, REQ_TIME);
J
Jaegeuk Kim 已提交
1830
	return 0;
1831 1832

free_kobj:
1833
	f2fs_sync_inode_meta(sbi);
1834
	kobject_del(&sbi->s_kobj);
1835 1836
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
1837
free_proc:
1838 1839
	if (sbi->s_proc) {
		remove_proc_entry("segment_info", sbi->s_proc);
1840
		remove_proc_entry("segment_bits", sbi->s_proc);
1841 1842 1843
		remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
	f2fs_destroy_stats(sbi);
J
Jaegeuk Kim 已提交
1844 1845 1846 1847
free_root_inode:
	dput(sb->s_root);
	sb->s_root = NULL;
free_node_inode:
1848 1849
	mutex_lock(&sbi->umount_mutex);
	f2fs_leave_shrinker(sbi);
J
Jaegeuk Kim 已提交
1850
	iput(sbi->node_inode);
1851
	mutex_unlock(&sbi->umount_mutex);
J
Jaegeuk Kim 已提交
1852 1853 1854 1855 1856 1857 1858 1859
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);
1860
free_options:
1861
	destroy_percpu_info(sbi);
1862
	kfree(options);
J
Jaegeuk Kim 已提交
1863
free_sb_buf:
Y
Yunlei He 已提交
1864
	kfree(raw_super);
J
Jaegeuk Kim 已提交
1865
free_sbi:
K
Keith Mok 已提交
1866 1867
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
J
Jaegeuk Kim 已提交
1868
	kfree(sbi);
1869 1870 1871

	/* give only one another chance */
	if (retry) {
1872
		retry = false;
1873 1874 1875
		shrink_dcache_sb(sb);
		goto try_onemore;
	}
J
Jaegeuk Kim 已提交
1876 1877 1878 1879 1880 1881 1882 1883 1884
	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);
}

1885 1886 1887
static void kill_f2fs_super(struct super_block *sb)
{
	if (sb->s_root)
1888
		set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1889 1890 1891
	kill_block_super(sb);
}

J
Jaegeuk Kim 已提交
1892 1893 1894 1895
static struct file_system_type f2fs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "f2fs",
	.mount		= f2fs_mount,
1896
	.kill_sb	= kill_f2fs_super,
J
Jaegeuk Kim 已提交
1897 1898
	.fs_flags	= FS_REQUIRES_DEV,
};
1899
MODULE_ALIAS_FS("f2fs");
J
Jaegeuk Kim 已提交
1900

1901
static int __init init_inodecache(void)
J
Jaegeuk Kim 已提交
1902
{
1903 1904 1905
	f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
			sizeof(struct f2fs_inode_info), 0,
			SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
1906
	if (!f2fs_inode_cachep)
J
Jaegeuk Kim 已提交
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924
		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;

1925 1926
	f2fs_build_trace_ios();

J
Jaegeuk Kim 已提交
1927 1928 1929 1930 1931
	err = init_inodecache();
	if (err)
		goto fail;
	err = create_node_manager_caches();
	if (err)
1932
		goto free_inodecache;
1933
	err = create_segment_manager_caches();
J
Jaegeuk Kim 已提交
1934
	if (err)
1935
		goto free_node_manager_caches;
J
Jaegeuk Kim 已提交
1936 1937
	err = create_checkpoint_caches();
	if (err)
1938
		goto free_segment_manager_caches;
C
Chao Yu 已提交
1939 1940 1941
	err = create_extent_cache();
	if (err)
		goto free_checkpoint_caches;
1942
	f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1943 1944
	if (!f2fs_kset) {
		err = -ENOMEM;
C
Chao Yu 已提交
1945
		goto free_extent_cache;
1946
	}
S
Sheng Yong 已提交
1947 1948 1949 1950 1951 1952 1953 1954 1955 1956
#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
1957
	err = register_shrinker(&f2fs_shrinker_info);
1958
	if (err)
1959
		goto free_kset;
1960 1961 1962 1963

	err = register_filesystem(&f2fs_fs_type);
	if (err)
		goto free_shrinker;
1964 1965 1966
	err = f2fs_create_root_stats();
	if (err)
		goto free_filesystem;
1967
	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1968 1969
	return 0;

1970 1971
free_filesystem:
	unregister_filesystem(&f2fs_fs_type);
1972 1973
free_shrinker:
	unregister_shrinker(&f2fs_shrinker_info);
1974
free_kset:
S
Sheng Yong 已提交
1975 1976 1977 1978
#ifdef CONFIG_F2FS_FAULT_INJECTION
	if (f2fs_fault_inject.kset)
		kobject_put(&f2fs_fault_inject);
#endif
1979
	kset_unregister(f2fs_kset);
C
Chao Yu 已提交
1980 1981
free_extent_cache:
	destroy_extent_cache();
1982 1983
free_checkpoint_caches:
	destroy_checkpoint_caches();
1984 1985
free_segment_manager_caches:
	destroy_segment_manager_caches();
1986 1987 1988 1989
free_node_manager_caches:
	destroy_node_manager_caches();
free_inodecache:
	destroy_inodecache();
J
Jaegeuk Kim 已提交
1990 1991 1992 1993 1994 1995
fail:
	return err;
}

static void __exit exit_f2fs_fs(void)
{
1996
	remove_proc_entry("fs/f2fs", NULL);
1997
	f2fs_destroy_root_stats();
J
Jaegeuk Kim 已提交
1998
	unregister_filesystem(&f2fs_fs_type);
T
Tiezhu Yang 已提交
1999 2000 2001 2002 2003
	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
2004
	destroy_extent_cache();
J
Jaegeuk Kim 已提交
2005
	destroy_checkpoint_caches();
2006
	destroy_segment_manager_caches();
J
Jaegeuk Kim 已提交
2007 2008
	destroy_node_manager_caches();
	destroy_inodecache();
2009
	f2fs_destroy_trace_ios();
J
Jaegeuk Kim 已提交
2010 2011 2012 2013 2014 2015 2016 2017
}

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");