f2fs: add super block operations
This adds the implementation of superblock operations for f2fs, which includes - init_f2fs_fs/exit_f2fs_fs - f2fs_mount - super_operations of f2fs Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim
Родитель
39a53e0ce0
Коммит
aff063e266
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@ -0,0 +1,656 @@
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/**
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* fs/f2fs/super.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/statfs.h>
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#include <linux/proc_fs.h>
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#include <linux/buffer_head.h>
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#include <linux/backing-dev.h>
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#include <linux/kthread.h>
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#include <linux/parser.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include <linux/random.h>
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#include <linux/exportfs.h>
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#include <linux/f2fs_fs.h>
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#include "f2fs.h"
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#include "node.h"
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#include "xattr.h"
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static struct kmem_cache *f2fs_inode_cachep;
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enum {
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Opt_gc_background_off,
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Opt_disable_roll_forward,
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Opt_discard,
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Opt_noheap,
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Opt_nouser_xattr,
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Opt_noacl,
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Opt_active_logs,
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Opt_disable_ext_identify,
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Opt_err,
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};
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static match_table_t f2fs_tokens = {
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{Opt_gc_background_off, "background_gc_off"},
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{Opt_disable_roll_forward, "disable_roll_forward"},
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{Opt_discard, "discard"},
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{Opt_noheap, "no_heap"},
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{Opt_nouser_xattr, "nouser_xattr"},
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{Opt_noacl, "noacl"},
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{Opt_active_logs, "active_logs=%u"},
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{Opt_disable_ext_identify, "disable_ext_identify"},
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{Opt_err, NULL},
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};
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static void init_once(void *foo)
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{
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struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
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memset(fi, 0, sizeof(*fi));
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inode_init_once(&fi->vfs_inode);
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}
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static struct inode *f2fs_alloc_inode(struct super_block *sb)
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{
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struct f2fs_inode_info *fi;
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fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
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if (!fi)
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return NULL;
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init_once((void *) fi);
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/* Initilize f2fs-specific inode info */
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fi->vfs_inode.i_version = 1;
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atomic_set(&fi->dirty_dents, 0);
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fi->i_current_depth = 1;
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fi->i_advise = 0;
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rwlock_init(&fi->ext.ext_lock);
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set_inode_flag(fi, FI_NEW_INODE);
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return &fi->vfs_inode;
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}
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static void f2fs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
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}
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void f2fs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, f2fs_i_callback);
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}
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static void f2fs_put_super(struct super_block *sb)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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f2fs_destroy_stats(sbi);
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stop_gc_thread(sbi);
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write_checkpoint(sbi, false, true);
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iput(sbi->node_inode);
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iput(sbi->meta_inode);
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/* destroy f2fs internal modules */
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destroy_node_manager(sbi);
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destroy_segment_manager(sbi);
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kfree(sbi->ckpt);
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sb->s_fs_info = NULL;
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brelse(sbi->raw_super_buf);
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kfree(sbi);
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}
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int f2fs_sync_fs(struct super_block *sb, int sync)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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int ret = 0;
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if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
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return 0;
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if (sync)
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write_checkpoint(sbi, false, false);
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return ret;
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}
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static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
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block_t total_count, user_block_count, start_count, ovp_count;
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total_count = le64_to_cpu(sbi->raw_super->block_count);
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user_block_count = sbi->user_block_count;
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start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
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ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
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buf->f_type = F2FS_SUPER_MAGIC;
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buf->f_bsize = sbi->blocksize;
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buf->f_blocks = total_count - start_count;
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buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
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buf->f_bavail = user_block_count - valid_user_blocks(sbi);
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buf->f_files = valid_inode_count(sbi);
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buf->f_ffree = sbi->total_node_count - valid_node_count(sbi);
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buf->f_namelen = F2FS_MAX_NAME_LEN;
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buf->f_fsid.val[0] = (u32)id;
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buf->f_fsid.val[1] = (u32)(id >> 32);
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return 0;
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}
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static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
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if (test_opt(sbi, BG_GC))
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seq_puts(seq, ",background_gc_on");
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else
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seq_puts(seq, ",background_gc_off");
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if (test_opt(sbi, DISABLE_ROLL_FORWARD))
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seq_puts(seq, ",disable_roll_forward");
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if (test_opt(sbi, DISCARD))
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seq_puts(seq, ",discard");
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if (test_opt(sbi, NOHEAP))
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seq_puts(seq, ",no_heap_alloc");
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#ifdef CONFIG_F2FS_FS_XATTR
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if (test_opt(sbi, XATTR_USER))
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seq_puts(seq, ",user_xattr");
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else
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seq_puts(seq, ",nouser_xattr");
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#endif
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#ifdef CONFIG_F2FS_FS_POSIX_ACL
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if (test_opt(sbi, POSIX_ACL))
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seq_puts(seq, ",acl");
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else
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seq_puts(seq, ",noacl");
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#endif
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if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
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seq_puts(seq, ",disable_ext_indentify");
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seq_printf(seq, ",active_logs=%u", sbi->active_logs);
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return 0;
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}
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static struct super_operations f2fs_sops = {
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.alloc_inode = f2fs_alloc_inode,
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.destroy_inode = f2fs_destroy_inode,
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.write_inode = f2fs_write_inode,
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.show_options = f2fs_show_options,
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.evict_inode = f2fs_evict_inode,
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.put_super = f2fs_put_super,
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.sync_fs = f2fs_sync_fs,
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.statfs = f2fs_statfs,
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};
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static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
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u64 ino, u32 generation)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *inode;
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if (ino < F2FS_ROOT_INO(sbi))
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return ERR_PTR(-ESTALE);
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/*
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* f2fs_iget isn't quite right if the inode is currently unallocated!
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* However f2fs_iget currently does appropriate checks to handle stale
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* inodes so everything is OK.
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*/
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inode = f2fs_iget(sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (generation && inode->i_generation != generation) {
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/* we didn't find the right inode.. */
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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return inode;
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}
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static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
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f2fs_nfs_get_inode);
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}
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static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
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int fh_len, int fh_type)
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{
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return generic_fh_to_parent(sb, fid, fh_len, fh_type,
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f2fs_nfs_get_inode);
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}
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static const struct export_operations f2fs_export_ops = {
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.fh_to_dentry = f2fs_fh_to_dentry,
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.fh_to_parent = f2fs_fh_to_parent,
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.get_parent = f2fs_get_parent,
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};
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static int parse_options(struct f2fs_sb_info *sbi, char *options)
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{
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int arg = 0;
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if (!options)
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return 0;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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/*
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* Initialize args struct so we know whether arg was
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* found; some options take optional arguments.
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*/
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args[0].to = args[0].from = NULL;
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token = match_token(p, f2fs_tokens, args);
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switch (token) {
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case Opt_gc_background_off:
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clear_opt(sbi, BG_GC);
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break;
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case Opt_disable_roll_forward:
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set_opt(sbi, DISABLE_ROLL_FORWARD);
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break;
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case Opt_discard:
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set_opt(sbi, DISCARD);
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break;
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case Opt_noheap:
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set_opt(sbi, NOHEAP);
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break;
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#ifdef CONFIG_F2FS_FS_XATTR
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case Opt_nouser_xattr:
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clear_opt(sbi, XATTR_USER);
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break;
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#else
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case Opt_nouser_xattr:
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pr_info("nouser_xattr options not supported\n");
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break;
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#endif
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#ifdef CONFIG_F2FS_FS_POSIX_ACL
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case Opt_noacl:
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clear_opt(sbi, POSIX_ACL);
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break;
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#else
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case Opt_noacl:
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pr_info("noacl options not supported\n");
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break;
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#endif
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case Opt_active_logs:
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if (args->from && match_int(args, &arg))
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return -EINVAL;
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if (arg != 2 && arg != 4 && arg != 6)
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return -EINVAL;
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sbi->active_logs = arg;
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break;
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case Opt_disable_ext_identify:
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set_opt(sbi, DISABLE_EXT_IDENTIFY);
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static loff_t max_file_size(unsigned bits)
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{
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loff_t result = ADDRS_PER_INODE;
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loff_t leaf_count = ADDRS_PER_BLOCK;
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/* two direct node blocks */
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result += (leaf_count * 2);
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/* two indirect node blocks */
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leaf_count *= NIDS_PER_BLOCK;
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result += (leaf_count * 2);
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/* one double indirect node block */
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leaf_count *= NIDS_PER_BLOCK;
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result += leaf_count;
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result <<= bits;
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return result;
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}
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static int sanity_check_raw_super(struct f2fs_super_block *raw_super)
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{
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unsigned int blocksize;
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if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic))
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return 1;
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/* Currently, support only 4KB block size */
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blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
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if (blocksize != PAGE_CACHE_SIZE)
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return 1;
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if (le32_to_cpu(raw_super->log_sectorsize) !=
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F2FS_LOG_SECTOR_SIZE)
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return 1;
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if (le32_to_cpu(raw_super->log_sectors_per_block) !=
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F2FS_LOG_SECTORS_PER_BLOCK)
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return 1;
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return 0;
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}
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static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
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struct f2fs_checkpoint *ckpt)
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{
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unsigned int total, fsmeta;
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total = le32_to_cpu(raw_super->segment_count);
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fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
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fsmeta += le32_to_cpu(raw_super->segment_count_sit);
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fsmeta += le32_to_cpu(raw_super->segment_count_nat);
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fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
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fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
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if (fsmeta >= total)
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return 1;
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return 0;
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}
|
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static void init_sb_info(struct f2fs_sb_info *sbi)
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{
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struct f2fs_super_block *raw_super = sbi->raw_super;
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int i;
|
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sbi->log_sectors_per_block =
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le32_to_cpu(raw_super->log_sectors_per_block);
|
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sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
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sbi->blocksize = 1 << sbi->log_blocksize;
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sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
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sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
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sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
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sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
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sbi->total_sections = le32_to_cpu(raw_super->section_count);
|
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sbi->total_node_count =
|
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(le32_to_cpu(raw_super->segment_count_nat) / 2)
|
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* sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
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sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
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sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
|
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sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
|
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|
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for (i = 0; i < NR_COUNT_TYPE; i++)
|
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atomic_set(&sbi->nr_pages[i], 0);
|
||||
}
|
||||
|
||||
static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
|
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{
|
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struct f2fs_sb_info *sbi;
|
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struct f2fs_super_block *raw_super;
|
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struct buffer_head *raw_super_buf;
|
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struct inode *root;
|
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long err = -EINVAL;
|
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int i;
|
||||
|
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/* allocate memory for f2fs-specific super block info */
|
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sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
|
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if (!sbi)
|
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return -ENOMEM;
|
||||
|
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/* set a temporary block size */
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if (!sb_set_blocksize(sb, F2FS_BLKSIZE))
|
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goto free_sbi;
|
||||
|
||||
/* read f2fs raw super block */
|
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raw_super_buf = sb_bread(sb, 0);
|
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if (!raw_super_buf) {
|
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err = -EIO;
|
||||
goto free_sbi;
|
||||
}
|
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raw_super = (struct f2fs_super_block *)
|
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((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
|
||||
|
||||
/* init some FS parameters */
|
||||
sbi->active_logs = NR_CURSEG_TYPE;
|
||||
|
||||
set_opt(sbi, BG_GC);
|
||||
|
||||
#ifdef CONFIG_F2FS_FS_XATTR
|
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set_opt(sbi, XATTR_USER);
|
||||
#endif
|
||||
#ifdef CONFIG_F2FS_FS_POSIX_ACL
|
||||
set_opt(sbi, POSIX_ACL);
|
||||
#endif
|
||||
/* parse mount options */
|
||||
if (parse_options(sbi, (char *)data))
|
||||
goto free_sb_buf;
|
||||
|
||||
/* sanity checking of raw super */
|
||||
if (sanity_check_raw_super(raw_super))
|
||||
goto free_sb_buf;
|
||||
|
||||
sb->s_maxbytes = max_file_size(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_fs_info = sbi;
|
||||
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->write_inode);
|
||||
mutex_init(&sbi->writepages);
|
||||
mutex_init(&sbi->cp_mutex);
|
||||
for (i = 0; i < NR_LOCK_TYPE; i++)
|
||||
mutex_init(&sbi->fs_lock[i]);
|
||||
sbi->por_doing = 0;
|
||||
spin_lock_init(&sbi->stat_lock);
|
||||
init_rwsem(&sbi->bio_sem);
|
||||
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)) {
|
||||
err = PTR_ERR(sbi->meta_inode);
|
||||
goto free_sb_buf;
|
||||
}
|
||||
|
||||
err = get_valid_checkpoint(sbi);
|
||||
if (err)
|
||||
goto free_meta_inode;
|
||||
|
||||
/* sanity checking of checkpoint */
|
||||
err = -EINVAL;
|
||||
if (sanity_check_ckpt(raw_super, sbi->ckpt))
|
||||
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 super block */
|
||||
if (!sb_set_blocksize(sb, sbi->blocksize))
|
||||
goto free_cp;
|
||||
|
||||
init_orphan_info(sbi);
|
||||
|
||||
/* setup f2fs internal modules */
|
||||
err = build_segment_manager(sbi);
|
||||
if (err)
|
||||
goto free_sm;
|
||||
err = build_node_manager(sbi);
|
||||
if (err)
|
||||
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)) {
|
||||
err = PTR_ERR(sbi->node_inode);
|
||||
goto free_nm;
|
||||
}
|
||||
|
||||
/* if there are nt orphan nodes free them */
|
||||
err = -EINVAL;
|
||||
if (!(sbi->ckpt->ckpt_flags & CP_UMOUNT_FLAG) &&
|
||||
recover_orphan_inodes(sbi))
|
||||
goto free_node_inode;
|
||||
|
||||
/* read root inode and dentry */
|
||||
root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
|
||||
if (IS_ERR(root)) {
|
||||
err = PTR_ERR(root);
|
||||
goto free_node_inode;
|
||||
}
|
||||
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
|
||||
goto free_root_inode;
|
||||
|
||||
sb->s_root = d_make_root(root); /* allocate root dentry */
|
||||
if (!sb->s_root) {
|
||||
err = -ENOMEM;
|
||||
goto free_root_inode;
|
||||
}
|
||||
|
||||
/* recover fsynced data */
|
||||
if (!(sbi->ckpt->ckpt_flags & CP_UMOUNT_FLAG) &&
|
||||
!test_opt(sbi, DISABLE_ROLL_FORWARD))
|
||||
recover_fsync_data(sbi);
|
||||
|
||||
/* After POR, we can run background GC thread */
|
||||
err = start_gc_thread(sbi);
|
||||
if (err)
|
||||
goto fail;
|
||||
|
||||
err = f2fs_build_stats(sbi);
|
||||
if (err)
|
||||
goto fail;
|
||||
|
||||
return 0;
|
||||
fail:
|
||||
stop_gc_thread(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_sb_buf:
|
||||
brelse(raw_super_buf);
|
||||
free_sbi:
|
||||
kfree(sbi);
|
||||
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 struct file_system_type f2fs_fs_type = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "f2fs",
|
||||
.mount = f2fs_mount,
|
||||
.kill_sb = kill_block_super,
|
||||
.fs_flags = FS_REQUIRES_DEV,
|
||||
};
|
||||
|
||||
static int init_inodecache(void)
|
||||
{
|
||||
f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
|
||||
sizeof(struct f2fs_inode_info), NULL);
|
||||
if (f2fs_inode_cachep == NULL)
|
||||
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;
|
||||
|
||||
err = init_inodecache();
|
||||
if (err)
|
||||
goto fail;
|
||||
err = create_node_manager_caches();
|
||||
if (err)
|
||||
goto fail;
|
||||
err = create_gc_caches();
|
||||
if (err)
|
||||
goto fail;
|
||||
err = create_checkpoint_caches();
|
||||
if (err)
|
||||
goto fail;
|
||||
return register_filesystem(&f2fs_fs_type);
|
||||
fail:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit exit_f2fs_fs(void)
|
||||
{
|
||||
destroy_root_stats();
|
||||
unregister_filesystem(&f2fs_fs_type);
|
||||
destroy_checkpoint_caches();
|
||||
destroy_gc_caches();
|
||||
destroy_node_manager_caches();
|
||||
destroy_inodecache();
|
||||
}
|
||||
|
||||
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");
|
||||
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