erofs: keep meta inode into erofs_buf
So that erofs_read_metadata() can read metadata from other inodes
(e.g. packed inode) as well.
Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230407141710.113882-2-jefflexu@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 03c6ffd..6fe9a77 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -31,11 +31,11 @@ void erofs_put_metabuf(struct erofs_buf *buf)
* Derive the block size from inode->i_blkbits to make compatible with
* anonymous inode in fscache mode.
*/
-void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
- erofs_blk_t blkaddr, enum erofs_kmap_type type)
+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;
- struct address_space *const mapping = inode->i_mapping;
pgoff_t index = offset >> PAGE_SHIFT;
struct page *page = buf->page;
struct folio *folio;
@@ -45,7 +45,7 @@ void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
erofs_put_metabuf(buf);
nofs_flag = memalloc_nofs_save();
- folio = read_cache_folio(mapping, index, NULL, NULL);
+ folio = read_cache_folio(inode->i_mapping, index, NULL, NULL);
memalloc_nofs_restore(nofs_flag);
if (IS_ERR(folio))
return folio;
@@ -67,14 +67,19 @@ void *erofs_bread(struct erofs_buf *buf, struct inode *inode,
return buf->base + (offset & ~PAGE_MASK);
}
+void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb)
+{
+ if (erofs_is_fscache_mode(sb))
+ buf->inode = EROFS_SB(sb)->s_fscache->inode;
+ else
+ buf->inode = sb->s_bdev->bd_inode;
+}
+
void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
erofs_blk_t blkaddr, enum erofs_kmap_type type)
{
- if (erofs_is_fscache_mode(sb))
- return erofs_bread(buf, EROFS_SB(sb)->s_fscache->inode,
- blkaddr, type);
-
- return erofs_bread(buf, sb->s_bdev->bd_inode, blkaddr, type);
+ erofs_init_metabuf(buf, sb);
+ return erofs_bread(buf, blkaddr, type);
}
static int erofs_map_blocks_flatmode(struct inode *inode,
