linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * mdt.c - meta data file for NILFS

 *

 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.

 *

 * Written by Ryusuke Konishi.

 */

​

#include <linux/buffer_head.h>

#include <linux/mpage.h>

#include <linux/mm.h>

#include <linux/writeback.h>

#include <linux/backing-dev.h>

#include <linux/swap.h>

#include <linux/slab.h>

#include "nilfs.h"

#include "btnode.h"

#include "segment.h"

#include "page.h"

#include "mdt.h"

#include "alloc.h"      /* nilfs_palloc_destroy_cache() */

​

#include <trace/events/nilfs2.h>

​

#define NILFS_MDT_MAX_RA_BLOCKS     (16 - 1)

​

​

static int

nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block,

               struct buffer_head *bh,

               void (*init_block)(struct inode *,

                          struct buffer_head *, void *))

{

    struct nilfs_inode_info *ii = NILFS_I(inode);

    void *kaddr;

    int ret;

​

    /* Caller exclude read accesses using page lock */

​

    /* set_buffer_new(bh); */

    bh->b_blocknr = 0;

​

    ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh);

    if (unlikely(ret))

        return ret;

​

    set_buffer_mapped(bh);

​

    kaddr = kmap_atomic(bh->b_page);

    memset(kaddr + bh_offset(bh), 0, i_blocksize(inode));

    if (init_block)

        init_block(inode, bh, kaddr);

    flush_dcache_page(bh->b_page);

    kunmap_atomic(kaddr);

​

    set_buffer_uptodate(bh);

    mark_buffer_dirty(bh);

    nilfs_mdt_mark_dirty(inode);

​

    trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block);

​

    return 0;