--- /dev/null
+/*
+ * 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>
+#include <linux/proc_fs.h>
+#include <linux/random.h>
+#include <linux/exportfs.h>
+#include <linux/blkdev.h>
+#include <linux/f2fs_fs.h>
+#include <linux/sysfs.h>
+
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+#include "xattr.h"
+#include "gc.h"
+#include "trace.h"
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/f2fs.h>
+
+static struct proc_dir_entry *f2fs_proc_root;
+static struct kmem_cache *f2fs_inode_cachep;
+static struct kset *f2fs_kset;
+
+enum {
+ Opt_gc_background,
+ Opt_disable_roll_forward,
+ Opt_norecovery,
+ Opt_discard,
+ Opt_noheap,
+ Opt_user_xattr,
+ Opt_nouser_xattr,
+ Opt_acl,
+ Opt_noacl,
+ Opt_active_logs,
+ Opt_disable_ext_identify,
+ Opt_inline_xattr,
+ Opt_inline_data,
+ Opt_inline_dentry,
+ Opt_flush_merge,
+ Opt_nobarrier,
+ Opt_fastboot,
+ Opt_extent_cache,
+ Opt_noinline_data,
+ Opt_err,
+};
+
+static match_table_t f2fs_tokens = {
+ {Opt_gc_background, "background_gc=%s"},
+ {Opt_disable_roll_forward, "disable_roll_forward"},
+ {Opt_norecovery, "norecovery"},
+ {Opt_discard, "discard"},
+ {Opt_noheap, "no_heap"},
+ {Opt_user_xattr, "user_xattr"},
+ {Opt_nouser_xattr, "nouser_xattr"},
+ {Opt_acl, "acl"},
+ {Opt_noacl, "noacl"},
+ {Opt_active_logs, "active_logs=%u"},
+ {Opt_disable_ext_identify, "disable_ext_identify"},
+ {Opt_inline_xattr, "inline_xattr"},
+ {Opt_inline_data, "inline_data"},
+ {Opt_inline_dentry, "inline_dentry"},
+ {Opt_flush_merge, "flush_merge"},
+ {Opt_nobarrier, "nobarrier"},
+ {Opt_fastboot, "fastboot"},
+ {Opt_extent_cache, "extent_cache"},
+ {Opt_noinline_data, "noinline_data"},
+ {Opt_err, NULL},
+};
+
+/* Sysfs support for f2fs */
+enum {
+ GC_THREAD, /* struct f2fs_gc_thread */
+ SM_INFO, /* struct f2fs_sm_info */
+ NM_INFO, /* struct f2fs_nm_info */
+ F2FS_SBI, /* struct f2fs_sb_info */
+};
+
+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);
+ int struct_type;
+ int offset;
+};
+
+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);
+ else if (struct_type == NM_INFO)
+ return (unsigned char *)NM_I(sbi);
+ else if (struct_type == F2FS_SBI)
+ return (unsigned char *)sbi;
+ return NULL;
+}
+
+static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
+ struct f2fs_sb_info *sbi, char *buf)
+{
+ unsigned char *ptr = NULL;
+ unsigned int *ui;
+
+ ptr = __struct_ptr(sbi, a->struct_type);
+ if (!ptr)
+ return -EINVAL;
+
+ ui = (unsigned int *)(ptr + a->offset);
+
+ 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)
+{
+ unsigned char *ptr;
+ unsigned long t;
+ unsigned int *ui;
+ ssize_t ret;
+
+ ptr = __struct_ptr(sbi, a->struct_type);
+ if (!ptr)
+ return -EINVAL;
+
+ ui = (unsigned int *)(ptr + a->offset);
+
+ ret = kstrtoul(skip_spaces(buf), 0, &t);
+ if (ret < 0)
+ return ret;
+ *ui = t;
+ return count;
+}
+
+static ssize_t f2fs_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+ return a->show ? a->show(a, sbi, buf) : 0;
+}
+
+static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
+
+ return a->store ? a->store(a, sbi, buf, len) : 0;
+}
+
+static void f2fs_sb_release(struct kobject *kobj)
+{
+ struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
+ s_kobj);
+ complete(&sbi->s_kobj_unregister);
+}
+
+#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
+static struct f2fs_attr f2fs_attr_##_name = { \
+ .attr = {.name = __stringify(_name), .mode = _mode }, \
+ .show = _show, \
+ .store = _store, \
+ .struct_type = _struct_type, \
+ .offset = _offset \
+}
+
+#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))
+
+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);
+F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
+F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
+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);
+F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
+F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
+
+#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),
+ ATTR_LIST(gc_idle),
+ ATTR_LIST(reclaim_segments),
+ ATTR_LIST(max_small_discards),
+ ATTR_LIST(batched_trim_sections),
+ ATTR_LIST(ipu_policy),
+ ATTR_LIST(min_ipu_util),
+ ATTR_LIST(min_fsync_blocks),
+ ATTR_LIST(max_victim_search),
+ ATTR_LIST(dir_level),
+ ATTR_LIST(ram_thresh),
+ 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,
+};
+
+void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
+ va_end(args);
+}
+
+static void init_once(void *foo)
+{
+ struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
+
+ inode_init_once(&fi->vfs_inode);
+}
+
+static int parse_options(struct super_block *sb, char *options)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ substring_t args[MAX_OPT_ARGS];
+ char *p, *name;
+ int arg = 0;
+
+ if (!options)
+ return 0;
+
+ while ((p = strsep(&options, ",")) != NULL) {
+ int token;
+ if (!*p)
+ continue;
+ /*
+ * Initialize args struct so we know whether arg was
+ * found; some options take optional arguments.
+ */
+ args[0].to = args[0].from = NULL;
+ token = match_token(p, f2fs_tokens, args);
+
+ switch (token) {
+ case Opt_gc_background:
+ name = match_strdup(&args[0]);
+
+ if (!name)
+ return -ENOMEM;
+ if (strlen(name) == 2 && !strncmp(name, "on", 2))
+ set_opt(sbi, BG_GC);
+ else if (strlen(name) == 3 && !strncmp(name, "off", 3))
+ clear_opt(sbi, BG_GC);
+ else {
+ kfree(name);
+ return -EINVAL;
+ }
+ kfree(name);
+ break;
+ case Opt_disable_roll_forward:
+ set_opt(sbi, DISABLE_ROLL_FORWARD);
+ break;
+ case Opt_norecovery:
+ /* this option mounts f2fs with ro */
+ set_opt(sbi, DISABLE_ROLL_FORWARD);
+ if (!f2fs_readonly(sb))
+ return -EINVAL;
+ break;
+ case Opt_discard:
+ set_opt(sbi, DISCARD);
+ break;
+ case Opt_noheap:
+ set_opt(sbi, NOHEAP);
+ break;
+#ifdef CONFIG_F2FS_FS_XATTR
+ case Opt_user_xattr:
+ set_opt(sbi, XATTR_USER);
+ break;
+ case Opt_nouser_xattr:
+ clear_opt(sbi, XATTR_USER);
+ break;
+ case Opt_inline_xattr:
+ set_opt(sbi, INLINE_XATTR);
+ break;
+#else
+ case Opt_user_xattr:
+ f2fs_msg(sb, KERN_INFO,
+ "user_xattr options not supported");
+ break;
+ case Opt_nouser_xattr:
+ f2fs_msg(sb, KERN_INFO,
+ "nouser_xattr options not supported");
+ break;
+ case Opt_inline_xattr:
+ f2fs_msg(sb, KERN_INFO,
+ "inline_xattr options not supported");
+ break;
+#endif
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ case Opt_acl:
+ set_opt(sbi, POSIX_ACL);
+ break;
+ case Opt_noacl:
+ clear_opt(sbi, POSIX_ACL);
+ break;
+#else
+ case Opt_acl:
+ f2fs_msg(sb, KERN_INFO, "acl options not supported");
+ break;
+ 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;
+ case Opt_inline_data:
+ set_opt(sbi, INLINE_DATA);
+ break;
+ case Opt_inline_dentry:
+ set_opt(sbi, INLINE_DENTRY);
+ break;
+ case Opt_flush_merge:
+ set_opt(sbi, FLUSH_MERGE);
+ break;
+ case Opt_nobarrier:
+ set_opt(sbi, NOBARRIER);
+ break;
+ case Opt_fastboot:
+ set_opt(sbi, FASTBOOT);
+ break;
+ case Opt_extent_cache:
+ set_opt(sbi, EXTENT_CACHE);
+ break;
+ case Opt_noinline_data:
+ clear_opt(sbi, INLINE_DATA);
+ break;
+ default:
+ f2fs_msg(sb, KERN_ERR,
+ "Unrecognized mount option \"%s\" or missing value",
+ p);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static struct inode *f2fs_alloc_inode(struct super_block *sb)
+{
+ struct f2fs_inode_info *fi;
+
+ fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
+ if (!fi)
+ return NULL;
+
+ init_once((void *) fi);
+
+ /* Initialize f2fs-specific inode info */
+ fi->vfs_inode.i_version = 1;
+ atomic_set(&fi->dirty_pages, 0);
+ fi->i_current_depth = 1;
+ fi->i_advise = 0;
+ rwlock_init(&fi->ext_lock);
+ init_rwsem(&fi->i_sem);
+ INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
+ INIT_LIST_HEAD(&fi->inmem_pages);
+ mutex_init(&fi->inmem_lock);
+
+ set_inode_flag(fi, FI_NEW_INODE);
+
+ if (test_opt(F2FS_SB(sb), INLINE_XATTR))
+ set_inode_flag(fi, FI_INLINE_XATTR);
+
+ /* Will be used by directory only */
+ fi->i_dir_level = F2FS_SB(sb)->dir_level;
+
+ return &fi->vfs_inode;
+}
+
+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)
+ */
+ if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
+ return 0;
+ return generic_drop_inode(inode);
+}
+
+/*
+ * f2fs_dirty_inode() is called from __mark_inode_dirty()
+ *
+ * We should call set_dirty_inode to write the dirty inode through write_inode.
+ */
+static void f2fs_dirty_inode(struct inode *inode, int flags)
+{
+ set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
+}
+
+static void f2fs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
+}
+
+static void f2fs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, f2fs_i_callback);
+}
+
+static void f2fs_put_super(struct super_block *sb)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+
+ if (sbi->s_proc) {
+ remove_proc_entry("segment_info", sbi->s_proc);
+ remove_proc_entry(sb->s_id, f2fs_proc_root);
+ }
+ kobject_del(&sbi->s_kobj);
+
+ f2fs_destroy_stats(sbi);
+ stop_gc_thread(sbi);
+
+ /*
+ * 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.
+ */
+ if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
+ !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
+ struct cp_control cpc = {
+ .reason = CP_UMOUNT,
+ };
+ write_checkpoint(sbi, &cpc);
+ }
+
+ /*
+ * normally superblock is clean, so we need to release this.
+ * In addition, EIO will skip do checkpoint, we need this as well.
+ */
+ release_dirty_inode(sbi);
+ release_discard_addrs(sbi);
+
+ iput(sbi->node_inode);
+ iput(sbi->meta_inode);
+
+ /* destroy f2fs internal modules */
+ destroy_node_manager(sbi);
+ destroy_segment_manager(sbi);
+
+ kfree(sbi->ckpt);
+ kobject_put(&sbi->s_kobj);
+ wait_for_completion(&sbi->s_kobj_unregister);
+
+ sb->s_fs_info = NULL;
+ brelse(sbi->raw_super_buf);
+ kfree(sbi);
+}
+
+int f2fs_sync_fs(struct super_block *sb, int sync)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+
+ trace_f2fs_sync_fs(sb, sync);
+
+ if (sync) {
+ struct cp_control cpc;
+
+ cpc.reason = __get_cp_reason(sbi);
+
+ mutex_lock(&sbi->gc_mutex);
+ write_checkpoint(sbi, &cpc);
+ mutex_unlock(&sbi->gc_mutex);
+ } else {
+ f2fs_balance_fs(sbi);
+ }
+ f2fs_trace_ios(NULL, NULL, 1);
+
+ return 0;
+}
+
+static int f2fs_freeze(struct super_block *sb)
+{
+ int err;
+
+ if (f2fs_readonly(sb))
+ return 0;
+
+ err = f2fs_sync_fs(sb, 1);
+ return err;
+}
+
+static int f2fs_unfreeze(struct super_block *sb)
+{
+ return 0;
+}
+
+static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+ block_t total_count, user_block_count, start_count, ovp_count;
+
+ total_count = le64_to_cpu(sbi->raw_super->block_count);
+ user_block_count = sbi->user_block_count;
+ start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
+ ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
+ buf->f_type = F2FS_SUPER_MAGIC;
+ buf->f_bsize = sbi->blocksize;
+
+ buf->f_blocks = total_count - start_count;
+ buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
+ buf->f_bavail = user_block_count - valid_user_blocks(sbi);
+
+ buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
+ buf->f_ffree = buf->f_files - valid_inode_count(sbi);
+
+ buf->f_namelen = F2FS_NAME_LEN;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+
+ return 0;
+}
+
+static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
+
+ if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
+ seq_printf(seq, ",background_gc=%s", "on");
+ else
+ seq_printf(seq, ",background_gc=%s", "off");
+ if (test_opt(sbi, DISABLE_ROLL_FORWARD))
+ seq_puts(seq, ",disable_roll_forward");
+ if (test_opt(sbi, DISCARD))
+ seq_puts(seq, ",discard");
+ if (test_opt(sbi, NOHEAP))
+ seq_puts(seq, ",no_heap_alloc");
+#ifdef CONFIG_F2FS_FS_XATTR
+ if (test_opt(sbi, XATTR_USER))
+ seq_puts(seq, ",user_xattr");
+ else
+ seq_puts(seq, ",nouser_xattr");
+ if (test_opt(sbi, INLINE_XATTR))
+ seq_puts(seq, ",inline_xattr");
+#endif
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ if (test_opt(sbi, POSIX_ACL))
+ seq_puts(seq, ",acl");
+ else
+ seq_puts(seq, ",noacl");
+#endif
+ if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
+ seq_puts(seq, ",disable_ext_identify");
+ if (test_opt(sbi, INLINE_DATA))
+ seq_puts(seq, ",inline_data");
+ else
+ seq_puts(seq, ",noinline_data");
+ if (test_opt(sbi, INLINE_DENTRY))
+ seq_puts(seq, ",inline_dentry");
+ if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
+ seq_puts(seq, ",flush_merge");
+ if (test_opt(sbi, NOBARRIER))
+ seq_puts(seq, ",nobarrier");
+ if (test_opt(sbi, FASTBOOT))
+ seq_puts(seq, ",fastboot");
+ if (test_opt(sbi, EXTENT_CACHE))
+ seq_puts(seq, ",extent_cache");
+ seq_printf(seq, ",active_logs=%u", sbi->active_logs);
+
+ return 0;
+}
+
+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);
+ unsigned int total_segs =
+ le32_to_cpu(sbi->raw_super->segment_count_main);
+ int i;
+
+ seq_puts(seq, "format: segment_type|valid_blocks\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);
+
+ if ((i % 10) == 0)
+ seq_printf(seq, "%-5d", i);
+ seq_printf(seq, "%d|%-3u", se->type,
+ get_valid_blocks(sbi, i, 1));
+ if ((i % 10) == 9 || i == (total_segs - 1))
+ seq_putc(seq, '\n');
+ else
+ seq_putc(seq, ' ');
+ }
+
+ return 0;
+}
+
+static int segment_info_open_fs(struct inode *inode, struct file *file)
+{
+ return single_open(file, segment_info_seq_show, PDE_DATA(inode));
+}
+
+static const struct file_operations f2fs_seq_segment_info_fops = {
+ .owner = THIS_MODULE,
+ .open = segment_info_open_fs,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+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;
+ bool need_restart_gc = false;
+ bool need_stop_gc = false;
+
+ sync_filesystem(sb);
+
+ /*
+ * Save the old mount options in case we
+ * need to restore them.
+ */
+ org_mount_opt = sbi->mount_opt;
+ active_logs = sbi->active_logs;
+
+ sbi->mount_opt.opt = 0;
+ sbi->active_logs = NR_CURSEG_TYPE;
+
+ /* parse mount options */
+ err = parse_options(sb, data);
+ if (err)
+ goto restore_opts;
+
+ /*
+ * Previous and new state of filesystem is RO,
+ * so skip checking GC and FLUSH_MERGE conditions.
+ */
+ if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
+ goto skip;
+
+ /*
+ * We stop the GC thread if FS is mounted as RO
+ * or if background_gc = off is passed in mount
+ * option. Also sync the filesystem.
+ */
+ if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
+ if (sbi->gc_thread) {
+ stop_gc_thread(sbi);
+ f2fs_sync_fs(sb, 1);
+ need_restart_gc = true;
+ }
+ } else if (!sbi->gc_thread) {
+ err = start_gc_thread(sbi);
+ if (err)
+ goto restore_opts;
+ need_stop_gc = true;
+ }
+
+ /*
+ * We stop issue flush thread if FS is mounted as RO
+ * or if flush_merge is not passed in mount option.
+ */
+ if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
+ destroy_flush_cmd_control(sbi);
+ } else if (!SM_I(sbi)->cmd_control_info) {
+ err = create_flush_cmd_control(sbi);
+ if (err)
+ goto restore_gc;
+ }
+skip:
+ /* Update the POSIXACL Flag */
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
+ return 0;
+restore_gc:
+ if (need_restart_gc) {
+ if (start_gc_thread(sbi))
+ f2fs_msg(sbi->sb, KERN_WARNING,
+ "background gc thread has stopped");
+ } else if (need_stop_gc) {
+ stop_gc_thread(sbi);
+ }
+restore_opts:
+ sbi->mount_opt = org_mount_opt;
+ sbi->active_logs = active_logs;
+ return err;
+}
+
+static struct super_operations f2fs_sops = {
+ .alloc_inode = f2fs_alloc_inode,
+ .drop_inode = f2fs_drop_inode,
+ .destroy_inode = f2fs_destroy_inode,
+ .write_inode = f2fs_write_inode,
+ .dirty_inode = f2fs_dirty_inode,
+ .show_options = f2fs_show_options,
+ .evict_inode = f2fs_evict_inode,
+ .put_super = f2fs_put_super,
+ .sync_fs = f2fs_sync_fs,
+ .freeze_fs = f2fs_freeze,
+ .unfreeze_fs = f2fs_unfreeze,
+ .statfs = f2fs_statfs,
+ .remount_fs = f2fs_remount,
+};
+
+static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ struct inode *inode;
+
+ if (check_nid_range(sbi, ino))
+ return ERR_PTR(-ESTALE);
+
+ /*
+ * f2fs_iget isn't quite right if the inode is currently unallocated!
+ * However f2fs_iget currently does appropriate checks to handle stale
+ * inodes so everything is OK.
+ */
+ inode = f2fs_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (unlikely(generation && inode->i_generation != generation)) {
+ /* we didn't find the right inode.. */
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+ return inode;
+}
+
+static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ f2fs_nfs_get_inode);
+}
+
+static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
+ int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ f2fs_nfs_get_inode);
+}
+
+static const struct export_operations f2fs_export_ops = {
+ .fh_to_dentry = f2fs_fh_to_dentry,
+ .fh_to_parent = f2fs_fh_to_parent,
+ .get_parent = f2fs_get_parent,
+};
+
+static loff_t max_file_size(unsigned bits)
+{
+ loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
+ loff_t leaf_count = ADDRS_PER_BLOCK;
+
+ /* two direct node blocks */
+ result += (leaf_count * 2);
+
+ /* two indirect node blocks */
+ leaf_count *= NIDS_PER_BLOCK;
+ result += (leaf_count * 2);
+
+ /* one double indirect node block */
+ leaf_count *= NIDS_PER_BLOCK;
+ result += leaf_count;
+
+ result <<= bits;
+ return result;
+}
+
+static int sanity_check_raw_super(struct super_block *sb,
+ struct f2fs_super_block *raw_super)
+{
+ unsigned int blocksize;
+
+ if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
+ f2fs_msg(sb, KERN_INFO,
+ "Magic Mismatch, valid(0x%x) - read(0x%x)",
+ F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
+ return 1;
+ }
+
+ /* Currently, support only 4KB page cache size */
+ if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
+ f2fs_msg(sb, KERN_INFO,
+ "Invalid page_cache_size (%lu), supports only 4KB\n",
+ PAGE_CACHE_SIZE);
+ return 1;
+ }
+
+ /* Currently, support only 4KB block size */
+ blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
+ if (blocksize != F2FS_BLKSIZE) {
+ f2fs_msg(sb, KERN_INFO,
+ "Invalid blocksize (%u), supports only 4KB\n",
+ blocksize);
+ return 1;
+ }
+
+ /* 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));
+ return 1;
+ }
+ 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));
+ return 1;
+ }
+ return 0;
+}
+
+static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
+{
+ unsigned int total, fsmeta;
+ struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
+ struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
+
+ total = le32_to_cpu(raw_super->segment_count);
+ fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
+ fsmeta += le32_to_cpu(raw_super->segment_count_sit);
+ fsmeta += le32_to_cpu(raw_super->segment_count_nat);
+ fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
+ fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
+
+ if (unlikely(fsmeta >= total))
+ return 1;
+
+ if (unlikely(f2fs_cp_error(sbi))) {
+ f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
+ return 1;
+ }
+ return 0;
+}
+
+static void init_sb_info(struct f2fs_sb_info *sbi)
+{
+ struct f2fs_super_block *raw_super = sbi->raw_super;
+ int i;
+
+ sbi->log_sectors_per_block =
+ le32_to_cpu(raw_super->log_sectors_per_block);
+ sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
+ sbi->blocksize = 1 << sbi->log_blocksize;
+ sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
+ sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
+ sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
+ sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
+ sbi->total_sections = le32_to_cpu(raw_super->section_count);
+ sbi->total_node_count =
+ (le32_to_cpu(raw_super->segment_count_nat) / 2)
+ * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
+ sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
+ sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
+ sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
+ sbi->cur_victim_sec = NULL_SECNO;
+ sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
+
+ for (i = 0; i < NR_COUNT_TYPE; i++)
+ atomic_set(&sbi->nr_pages[i], 0);
+
+ sbi->dir_level = DEF_DIR_LEVEL;
+ clear_sbi_flag(sbi, SBI_NEED_FSCK);
+}
+
+/*
+ * Read f2fs raw super block.
+ * Because we have two copies of super block, so read the first one at first,
+ * if the first one is invalid, move to read the second one.
+ */
+static int read_raw_super_block(struct super_block *sb,
+ struct f2fs_super_block **raw_super,
+ struct buffer_head **raw_super_buf)
+{
+ int block = 0;
+
+retry:
+ *raw_super_buf = sb_bread(sb, block);
+ if (!*raw_super_buf) {
+ f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
+ block + 1);
+ if (block == 0) {
+ block++;
+ goto retry;
+ } else {
+ return -EIO;
+ }
+ }
+
+ *raw_super = (struct f2fs_super_block *)
+ ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
+
+ /* sanity checking of raw super */
+ if (sanity_check_raw_super(sb, *raw_super)) {
+ brelse(*raw_super_buf);
+ f2fs_msg(sb, KERN_ERR,
+ "Can't find valid F2FS filesystem in %dth superblock",
+ block + 1);
+ if (block == 0) {
+ block++;
+ goto retry;
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
+{
+ struct f2fs_sb_info *sbi;
+ struct f2fs_super_block *raw_super = NULL;
+ struct buffer_head *raw_super_buf;
+ struct inode *root;
+ long err = -EINVAL;
+ bool retry = true, need_fsck = false;
+ char *options = NULL;
+ int i;
+
+try_onemore:
+ /* allocate memory for f2fs-specific super block info */
+ sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
+ if (!sbi)
+ return -ENOMEM;
+
+ /* set a block size */
+ if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
+ f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
+ goto free_sbi;
+ }
+
+ err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
+ if (err)
+ goto free_sbi;
+
+ sb->s_fs_info = sbi;
+ /* init some FS parameters */
+ sbi->active_logs = NR_CURSEG_TYPE;
+
+ set_opt(sbi, BG_GC);
+ set_opt(sbi, INLINE_DATA);
+
+#ifdef CONFIG_F2FS_FS_XATTR
+ set_opt(sbi, XATTR_USER);
+#endif
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ set_opt(sbi, POSIX_ACL);
+#endif
+ /* parse mount options */
+ options = kstrdup((const char *)data, GFP_KERNEL);
+ if (data && !options) {
+ err = -ENOMEM;
+ goto free_sb_buf;
+ }
+
+ err = parse_options(sb, options);
+ if (err)
+ goto free_options;
+
+ sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
+ sb->s_max_links = F2FS_LINK_MAX;
+ get_random_bytes(&sbi->s_next_generation, sizeof(u32));
+
+ sb->s_op = &f2fs_sops;
+ sb->s_xattr = f2fs_xattr_handlers;
+ sb->s_export_op = &f2fs_export_ops;
+ sb->s_magic = F2FS_SUPER_MAGIC;
+ sb->s_time_gran = 1;
+ sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
+ (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
+ memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
+
+ /* init f2fs-specific super block info */
+ sbi->sb = sb;
+ sbi->raw_super = raw_super;
+ sbi->raw_super_buf = raw_super_buf;
+ mutex_init(&sbi->gc_mutex);
+ mutex_init(&sbi->writepages);
+ mutex_init(&sbi->cp_mutex);
+ init_rwsem(&sbi->node_write);
+ clear_sbi_flag(sbi, SBI_POR_DOING);
+ spin_lock_init(&sbi->stat_lock);
+
+ init_rwsem(&sbi->read_io.io_rwsem);
+ sbi->read_io.sbi = sbi;
+ sbi->read_io.bio = NULL;
+ for (i = 0; i < NR_PAGE_TYPE; i++) {
+ init_rwsem(&sbi->write_io[i].io_rwsem);
+ sbi->write_io[i].sbi = sbi;
+ sbi->write_io[i].bio = NULL;
+ }
+
+ init_rwsem(&sbi->cp_rwsem);
+ init_waitqueue_head(&sbi->cp_wait);
+ init_sb_info(sbi);
+
+ /* get an inode for meta space */
+ sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
+ if (IS_ERR(sbi->meta_inode)) {
+ f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
+ err = PTR_ERR(sbi->meta_inode);
+ goto free_options;
+ }
+
+ err = get_valid_checkpoint(sbi);
+ if (err) {
+ f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
+ goto free_meta_inode;
+ }
+
+ /* sanity checking of checkpoint */
+ err = -EINVAL;
+ if (sanity_check_ckpt(sbi)) {
+ f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
+ goto free_cp;
+ }
+
+ sbi->total_valid_node_count =
+ le32_to_cpu(sbi->ckpt->valid_node_count);
+ sbi->total_valid_inode_count =
+ le32_to_cpu(sbi->ckpt->valid_inode_count);
+ sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
+ sbi->total_valid_block_count =
+ le64_to_cpu(sbi->ckpt->valid_block_count);
+ sbi->last_valid_block_count = sbi->total_valid_block_count;
+ sbi->alloc_valid_block_count = 0;
+ INIT_LIST_HEAD(&sbi->dir_inode_list);
+ spin_lock_init(&sbi->dir_inode_lock);
+
+ init_extent_cache_info(sbi);
+
+ init_ino_entry_info(sbi);
+
+ /* setup f2fs internal modules */
+ err = build_segment_manager(sbi);
+ if (err) {
+ f2fs_msg(sb, KERN_ERR,
+ "Failed to initialize F2FS segment manager");
+ goto free_sm;
+ }
+ err = build_node_manager(sbi);
+ if (err) {
+ f2fs_msg(sb, KERN_ERR,
+ "Failed to initialize F2FS node manager");
+ goto free_nm;
+ }
+
+ build_gc_manager(sbi);
+
+ /* get an inode for node space */
+ sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
+ if (IS_ERR(sbi->node_inode)) {
+ f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
+ err = PTR_ERR(sbi->node_inode);
+ goto free_nm;
+ }
+
+ /* if there are nt orphan nodes free them */
+ recover_orphan_inodes(sbi);
+
+ /* read root inode and dentry */
+ root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
+ if (IS_ERR(root)) {
+ f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
+ err = PTR_ERR(root);
+ goto free_node_inode;
+ }
+ if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
+ iput(root);
+ err = -EINVAL;
+ goto free_node_inode;
+ }
+
+ 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)
+ goto free_root_inode;
+
+ if (f2fs_proc_root)
+ sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
+
+ if (sbi->s_proc)
+ proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
+ &f2fs_seq_segment_info_fops, sb);
+
+ if (test_opt(sbi, DISCARD)) {
+ struct request_queue *q = bdev_get_queue(sb->s_bdev);
+ if (!blk_queue_discard(q))
+ f2fs_msg(sb, KERN_WARNING,
+ "mounting with \"discard\" option, but "
+ "the device does not support discard");
+ }
+
+ 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)
+ goto free_proc;
+
+ /* recover fsynced data */
+ if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
+ /*
+ * 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;
+ }
+
+ if (need_fsck)
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+
+ err = recover_fsync_data(sbi);
+ if (err) {
+ need_fsck = true;
+ f2fs_msg(sb, KERN_ERR,
+ "Cannot recover all fsync data errno=%ld", err);
+ goto free_kobj;
+ }
+ }
+
+ /*
+ * If filesystem is not mounted as read-only then
+ * do start the gc_thread.
+ */
+ if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
+ /* After POR, we can run background GC thread.*/
+ err = start_gc_thread(sbi);
+ if (err)
+ goto free_kobj;
+ }
+ kfree(options);
+ return 0;
+
+free_kobj:
+ kobject_del(&sbi->s_kobj);
+free_proc:
+ if (sbi->s_proc) {
+ remove_proc_entry("segment_info", sbi->s_proc);
+ remove_proc_entry(sb->s_id, f2fs_proc_root);
+ }
+ f2fs_destroy_stats(sbi);
+free_root_inode:
+ dput(sb->s_root);
+ sb->s_root = NULL;
+free_node_inode:
+ iput(sbi->node_inode);
+free_nm:
+ destroy_node_manager(sbi);
+free_sm:
+ destroy_segment_manager(sbi);
+free_cp:
+ kfree(sbi->ckpt);
+free_meta_inode:
+ make_bad_inode(sbi->meta_inode);
+ iput(sbi->meta_inode);
+free_options:
+ kfree(options);
+free_sb_buf:
+ brelse(raw_super_buf);
+free_sbi:
+ kfree(sbi);
+
+ /* give only one another chance */
+ if (retry) {
+ retry = false;
+ shrink_dcache_sb(sb);
+ goto try_onemore;
+ }
+ return err;
+}
+
+static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
+}
+
+static void kill_f2fs_super(struct super_block *sb)
+{
+ if (sb->s_root)
+ set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
+ kill_block_super(sb);
+}
+
+static struct file_system_type f2fs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "f2fs",
+ .mount = f2fs_mount,
+ .kill_sb = kill_f2fs_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("f2fs");
+
+static int __init init_inodecache(void)
+{
+ f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
+ sizeof(struct f2fs_inode_info));
+ if (!f2fs_inode_cachep)
+ 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;
+
+ f2fs_build_trace_ios();
+
+ err = init_inodecache();
+ if (err)
+ goto fail;
+ err = create_node_manager_caches();
+ if (err)
+ goto free_inodecache;
+ err = create_segment_manager_caches();
+ if (err)
+ goto free_node_manager_caches;
+ err = create_checkpoint_caches();
+ if (err)
+ goto free_segment_manager_caches;
+ err = create_extent_cache();
+ if (err)
+ goto free_checkpoint_caches;
+ f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
+ if (!f2fs_kset) {
+ err = -ENOMEM;
+ goto free_extent_cache;
+ }
+ err = register_filesystem(&f2fs_fs_type);
+ if (err)
+ goto free_kset;
+ f2fs_create_root_stats();
+ f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
+ return 0;
+
+free_kset:
+ kset_unregister(f2fs_kset);
+free_extent_cache:
+ destroy_extent_cache();
+free_checkpoint_caches:
+ destroy_checkpoint_caches();
+free_segment_manager_caches:
+ destroy_segment_manager_caches();
+free_node_manager_caches:
+ destroy_node_manager_caches();
+free_inodecache:
+ destroy_inodecache();
+fail:
+ return err;
+}
+
+static void __exit exit_f2fs_fs(void)
+{
+ remove_proc_entry("fs/f2fs", NULL);
+ f2fs_destroy_root_stats();
+ unregister_filesystem(&f2fs_fs_type);
+ destroy_extent_cache();
+ destroy_checkpoint_caches();
+ destroy_segment_manager_caches();
+ destroy_node_manager_caches();
+ destroy_inodecache();
+ kset_unregister(f2fs_kset);
+ f2fs_destroy_trace_ios();
+}
+
+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");
Code Review / kvmfornfv.git / blobdiff