linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * fs/mpage.c

 *

 * Copyright (C) 2002, Linus Torvalds.

 *

 * Contains functions related to preparing and submitting BIOs which contain

 * multiple pagecache pages.

 *

 * 15May2002    Andrew Morton

 *      Initial version

 * 27Jun2002    axboe@suse.de

 *      use bio_add_page() to build bio's just the right size

 */

​

#include <linux/kernel.h>

#include <linux/export.h>

#include <linux/mm.h>

#include <linux/kdev_t.h>

#include <linux/gfp.h>

#include <linux/bio.h>

#include <linux/fs.h>

#include <linux/buffer_head.h>

#include <linux/blkdev.h>

#include <linux/highmem.h>

#include <linux/prefetch.h>

#include <linux/mpage.h>

#include <linux/mm_inline.h>

#include <linux/writeback.h>

#include <linux/backing-dev.h>

#include <linux/pagevec.h>

#include <linux/cleancache.h>

#include "internal.h"

​

/*

 * I/O completion handler for multipage BIOs.

 *

 * The mpage code never puts partial pages into a BIO (except for end-of-file).

 * If a page does not map to a contiguous run of blocks then it simply falls

 * back to block_read_full_page().

 *

 * Why is this?  If a page's completion depends on a number of different BIOs

 * which can complete in any order (or at the same time) then determining the

 * status of that page is hard.  See end_buffer_async_read() for the details.

 * There is no point in duplicating all that complexity.

 */

static void mpage_end_io(struct bio *bio)

{

    struct bio_vec *bv;

    int i;

    struct bvec_iter_all iter_all;

​

    bio_for_each_segment_all(bv, bio, i, iter_all) {

        struct page *page = bv->bv_page;

        page_endio(page, bio_op(bio),

               blk_status_to_errno(bio->bi_status));

    }

​

    bio_put(bio);

}

​

static struct bio *mpage_bio_submit(int op, int op_flags, struct bio *bio)

{