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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: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2018-07-26 20:22:00 +08:00 committed by Greg Kroah-Hartman
parent b29e64d879
commit 55441958bb
2 changed files with 42 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/staging/erofs/data.c
View File

@ -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 @@ repeat:
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 @@ submit_bio_retry:
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 @@ submit_bio_retry:
/* 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 @@ submit_bio_retry:
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 @@ submit_bio_retry:
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 @@ submit_bio_retry:
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);

33
drivers/staging/erofs/internal.h
View File

@ -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);