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Commit 55441958 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman
Browse files

staging: erofs: globalize prepare_bio and __submit_bio 



The unzip subsystem also uses these functions,
let's export them to internal.h.

Signed-off-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b29e64d8

drivers/staging/erofs/data.c

+9 −25
Original line number Diff line number Diff line
@@ -38,26 +38,6 @@ static inline void read_endio(struct bio *bio) 
	bio_put(bio);

}



static void __submit_bio(struct bio *bio, unsigned op, unsigned op_flags)

{

	bio_set_op_attrs(bio, op, op_flags);

	submit_bio(bio);

}



static struct bio *prepare_bio(struct super_block *sb,

	erofs_blk_t blkaddr, unsigned nr_pages)

{

	struct bio *bio = bio_alloc(GFP_NOIO | __GFP_NOFAIL, nr_pages);



	BUG_ON(bio == NULL);



	bio->bi_end_io = read_endio;

	bio_set_dev(bio, sb->s_bdev);

	bio->bi_iter.bi_sector = blkaddr << LOG_SECTORS_PER_BLOCK;



	return bio;

}



/* prio -- true is used for dir */

struct page *erofs_get_meta_page(struct super_block *sb,

	erofs_blk_t blkaddr, bool prio)
@@ -80,7 +60,7 @@ struct page *erofs_get_meta_page(struct super_block *sb, 
		struct bio *bio;

		int err;



		bio = prepare_bio(sb, blkaddr, 1);

		bio = prepare_bio(sb, blkaddr, 1, read_endio);

		err = bio_add_page(bio, page, PAGE_SIZE, 0);

		BUG_ON(err != PAGE_SIZE);
@@ -236,6 +216,8 @@ static inline struct bio *erofs_read_raw_page( 
		struct erofs_map_blocks map = {

			.m_la = blknr_to_addr(current_block),

		};

		erofs_blk_t blknr;

		unsigned blkoff;



		err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW);

		if (unlikely(err))
@@ -253,6 +235,9 @@ static inline struct bio *erofs_read_raw_page( 
		/* for RAW access mode, m_plen must be equal to m_llen */

		BUG_ON(map.m_plen != map.m_llen);



		blknr = erofs_blknr(map.m_pa);

		blkoff = erofs_blkoff(map.m_pa);



		/* deal with inline page */

		if (map.m_flags & EROFS_MAP_META) {

			void *vsrc, *vto;
@@ -260,8 +245,7 @@ static inline struct bio *erofs_read_raw_page( 


			BUG_ON(map.m_plen > PAGE_SIZE);



			ipage = erofs_get_meta_page(inode->i_sb,

				erofs_blknr(map.m_pa), 0);

			ipage = erofs_get_meta_page(inode->i_sb, blknr, 0);



			if (IS_ERR(ipage)) {

				err = PTR_ERR(ipage);
@@ -270,7 +254,7 @@ static inline struct bio *erofs_read_raw_page( 


			vsrc = kmap_atomic(ipage);

			vto = kmap_atomic(page);

			memcpy(vto, vsrc + erofs_blkoff(map.m_pa), map.m_plen);

			memcpy(vto, vsrc + blkoff, map.m_plen);

			memset(vto + map.m_plen, 0, PAGE_SIZE - map.m_plen);

			kunmap_atomic(vto);

			kunmap_atomic(vsrc);
@@ -294,7 +278,7 @@ static inline struct bio *erofs_read_raw_page( 
		if (nblocks > BIO_MAX_PAGES)

			nblocks = BIO_MAX_PAGES;



		bio = prepare_bio(inode->i_sb, erofs_blknr(map.m_pa), nblocks);

		bio = prepare_bio(inode->i_sb, blknr, nblocks, read_endio);

	}



	err = bio_add_page(bio, page, PAGE_SIZE, 0);

drivers/staging/erofs/internal.h

+33 −0
Original line number Diff line number Diff line
@@ -285,6 +285,39 @@ struct erofs_map_blocks { 
#define EROFS_GET_BLOCKS_RAW    0x0001



/* data.c */

static inline struct bio *prepare_bio(

	struct super_block *sb,

	erofs_blk_t blkaddr, unsigned nr_pages,

	bio_end_io_t endio)

{

	gfp_t gfp = GFP_NOIO;

	struct bio *bio = bio_alloc(gfp, nr_pages);



	if (unlikely(bio == NULL) &&

		(current->flags & PF_MEMALLOC)) {

		do {

			nr_pages /= 2;

			if (unlikely(!nr_pages)) {

				bio = bio_alloc(gfp | __GFP_NOFAIL, 1);

				BUG_ON(bio == NULL);

				break;

			}

			bio = bio_alloc(gfp, nr_pages);

		} while (bio == NULL);

	}



	bio->bi_end_io = endio;

	bio_set_dev(bio, sb->s_bdev);

	bio->bi_iter.bi_sector = blkaddr << LOG_SECTORS_PER_BLOCK;

	return bio;

}



static inline void __submit_bio(struct bio *bio, unsigned op, unsigned op_flags)

{

	bio_set_op_attrs(bio, op, op_flags);

	submit_bio(bio);

}



extern struct page *erofs_get_meta_page(struct super_block *sb,

	erofs_blk_t blkaddr, bool prio);

extern int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);