[PATCH RFC v2 for-6.8/block 11/18] erofs: use bdev api

Yu Kuai
2023-12-11T14:08:50Z

Avoid to access bd_inode directly, prepare to remove bd_inode from
block_devcie.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
fs/erofs/data.c | 18 ++++++++++++------
fs/erofs/internal.h | 2 ++
2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index c98aeda8abb2..8cf3618190ab 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -32,8 +32,7 @@ void erofs_put_metabuf(struct erofs_buf *buf)
void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
enum erofs_kmap_type type)
{
- struct inode *inode = buf->inode;
- erofs_off_t offset = (erofs_off_t)blkaddr << inode->i_blkbits;
+ erofs_off_t offset = (erofs_off_t)blkaddr << buf->blkszbits;
pgoff_t index = offset >> PAGE_SHIFT;
struct page *page = buf->page;
struct folio *folio;
@@ -43,7 +42,9 @@ void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
erofs_put_metabuf(buf);

nofs_flag = memalloc_nofs_save();
- folio = read_cache_folio(inode->i_mapping, index, NULL, NULL);
+ folio = buf->inode ?
+ read_mapping_folio(buf->inode->i_mapping, index, NULL) :
+ bdev_read_folio(buf->bdev, offset);
memalloc_nofs_restore(nofs_flag);
if (IS_ERR(folio))
return folio;
@@ -67,10 +68,15 @@ void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,

void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb)
{
- if (erofs_is_fscache_mode(sb))
+ if (erofs_is_fscache_mode(sb)) {
buf->inode = EROFS_SB(sb)->s_fscache->inode;
- else
- buf->inode = sb->s_bdev->bd_inode;
+ buf->bdev = NULL;
+ buf->blkszbits = buf->inode->i_blkbits;
+ } else {
+ buf->inode = NULL;
+ buf->bdev = sb->s_bdev;
+ buf->blkszbits = EROFS_SB(sb)->blkszbits;
+ }
}

void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index b0409badb017..c9206351b485 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -224,8 +224,10 @@ enum erofs_kmap_type {

struct erofs_buf {
struct inode *inode;
+ struct block_device *bdev;
struct page *page;
void *base;
+ u8 blkszbits;
enum erofs_kmap_type kmap_type;
};
#define __EROFS_BUF_INITIALIZER ((struct erofs_buf){ .page = NULL })
--
2.39.2