Merge tag 'pull-bd_inode-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull bdev bd_inode updates from Al Viro:
 "Replacement of bdev->bd_inode with sane(r) set of primitives by me and
  Yu Kuai"

* tag 'pull-bd_inode-1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  RIP ->bd_inode
  dasd_format(): killing the last remaining user of ->bd_inode
  nilfs_attach_log_writer(): use ->bd_mapping->host instead of ->bd_inode
  block/bdev.c: use the knowledge of inode/bdev coallocation
  gfs2: more obvious initializations of mapping->host
  fs/buffer.c: massage the remaining users of ->bd_inode to ->bd_mapping
  blk_ioctl_{discard,zeroout}(): we only want ->bd_inode->i_mapping here...
  grow_dev_folio(): we only want ->bd_inode->i_mapping there
  use ->bd_mapping instead of ->bd_inode->i_mapping
  block_device: add a pointer to struct address_space (page cache of bdev)
  missing helpers: bdev_unhash(), bdev_drop()
  block: move two helpers into bdev.c
  block2mtd: prevent direct access of bd_inode
  dm-vdo: use bdev_nr_bytes(bdev) instead of i_size_read(bdev->bd_inode)
  blkdev_write_iter(): saner way to get inode and bdev
  bcachefs: remove dead function bdev_sectors()
  ext4: remove block_device_ejected()
  erofs_buf: store address_space instead of inode
  erofs: switch erofs_bread() to passing offset instead of block number

20 files changed, 61 insertions, 95 deletions

diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
index 5cf885b09986..5d2c470a49ac 100644
--- a/fs/bcachefs/util.h
+++ b/fs/bcachefs/util.h
@@ -445,11 +445,6 @@ static inline unsigned fract_exp_two(unsigned x, unsigned fract_bits)
 void bch2_bio_map(struct bio *bio, void *base, size_t);
 int bch2_bio_alloc_pages(struct bio *, size_t, gfp_t);
 
-static inline sector_t bdev_sectors(struct block_device *bdev)
-{
-	return bdev->bd_inode->i_size >> 9;
-}
-
 #define closure_bio_submit(bio, cl)					\
 do {									\
 	closure_get(cl);						\
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a91a8056758a..1b20b3e390df 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3656,7 +3656,7 @@ struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
 	struct btrfs_super_block *super;
 	struct page *page;
 	u64 bytenr, bytenr_orig;
-	struct address_space *mapping = bdev->bd_inode->i_mapping;
+	struct address_space *mapping = bdev->bd_mapping;
 	int ret;
 
 	bytenr_orig = btrfs_sb_offset(copy_num);
@@ -3743,7 +3743,7 @@ static int write_dev_supers(struct btrfs_device *device,
 			    struct btrfs_super_block *sb, int max_mirrors)
 {
 	struct btrfs_fs_info *fs_info = device->fs_info;
-	struct address_space *mapping = device->bdev->bd_inode->i_mapping;
+	struct address_space *mapping = device->bdev->bd_mapping;
 	SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
 	int i;
 	int ret;
@@ -3861,7 +3861,7 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
 		    device->commit_total_bytes)
 			break;
 
-		folio = filemap_get_folio(device->bdev->bd_inode->i_mapping,
+		folio = filemap_get_folio(device->bdev->bd_mapping,
 					  bytenr >> PAGE_SHIFT);
 		/* If the folio has been removed, then we know it completed. */
 		if (IS_ERR(folio))
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fccbbfc33b4b..c39145e8c4ad 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1290,7 +1290,7 @@ static struct btrfs_super_block *btrfs_read_disk_super(struct block_device *bdev
 		return ERR_PTR(-EINVAL);
 
 	/* pull in the page with our super */
-	page = read_cache_page_gfp(bdev->bd_inode->i_mapping, index, GFP_KERNEL);
+	page = read_cache_page_gfp(bdev->bd_mapping, index, GFP_KERNEL);
 
 	if (IS_ERR(page))
 		return ERR_CAST(page);
diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 4cba80b34387..9b43fa493219 100644
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -118,7 +118,7 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
 		return -ENOENT;
 	} else if (full[0] && full[1]) {
 		/* Compare two super blocks */
-		struct address_space *mapping = bdev->bd_inode->i_mapping;
+		struct address_space *mapping = bdev->bd_mapping;
 		struct page *page[BTRFS_NR_SB_LOG_ZONES];
 		struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
 		int i;
diff --git a/fs/buffer.c b/fs/buffer.c
index ed698caa8834..8c19e705b9c3 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -189,8 +189,8 @@ EXPORT_SYMBOL(end_buffer_write_sync);
 static struct buffer_head *
 __find_get_block_slow(struct block_device *bdev, sector_t block)
 {
-	struct inode *bd_inode = bdev->bd_inode;
-	struct address_space *bd_mapping = bd_inode->i_mapping;
+	struct address_space *bd_mapping = bdev->bd_mapping;
+	const int blkbits = bd_mapping->host->i_blkbits;
 	struct buffer_head *ret = NULL;
 	pgoff_t index;
 	struct buffer_head *bh;
@@ -199,7 +199,7 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
 	int all_mapped = 1;
 	static DEFINE_RATELIMIT_STATE(last_warned, HZ, 1);
 
-	index = ((loff_t)block << bd_inode->i_blkbits) / PAGE_SIZE;
+	index = ((loff_t)block << blkbits) / PAGE_SIZE;
 	folio = __filemap_get_folio(bd_mapping, index, FGP_ACCESSED, 0);
 	if (IS_ERR(folio))
 		goto out;
@@ -233,7 +233,7 @@ __find_get_block_slow(struct block_device *bdev, sector_t block)
 		       (unsigned long long)block,
 		       (unsigned long long)bh->b_blocknr,
 		       bh->b_state, bh->b_size, bdev,
-		       1 << bd_inode->i_blkbits);
+		       1 << blkbits);
 	}
 out_unlock:
 	spin_unlock(&bd_mapping->i_private_lock);
@@ -1041,12 +1041,12 @@ static sector_t folio_init_buffers(struct folio *folio,
 static bool grow_dev_folio(struct block_device *bdev, sector_t block,
 		pgoff_t index, unsigned size, gfp_t gfp)
 {
-	struct inode *inode = bdev->bd_inode;
+	struct address_space *mapping = bdev->bd_mapping;
 	struct folio *folio;
 	struct buffer_head *bh;
 	sector_t end_block = 0;
 
-	folio = __filemap_get_folio(inode->i_mapping, index,
+	folio = __filemap_get_folio(mapping, index,
 			FGP_LOCK | FGP_ACCESSED | FGP_CREAT, gfp);
 	if (IS_ERR(folio))
 		return false;
@@ -1080,10 +1080,10 @@ static bool grow_dev_folio(struct block_device *bdev, sector_t block,
 	 * lock to be atomic wrt __find_get_block(), which does not
 	 * run under the folio lock.
 	 */
-	spin_lock(&inode->i_mapping->i_private_lock);
+	spin_lock(&mapping->i_private_lock);
 	link_dev_buffers(folio, bh);
 	end_block = folio_init_buffers(folio, bdev, size);
-	spin_unlock(&inode->i_mapping->i_private_lock);
+	spin_unlock(&mapping->i_private_lock);
 unlock:
 	folio_unlock(folio);
 	folio_put(folio);
@@ -1486,7 +1486,7 @@ struct buffer_head *__bread_gfp(struct block_device *bdev, sector_t block,
 {
 	struct buffer_head *bh;
 
-	gfp |= mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+	gfp |= mapping_gfp_constraint(bdev->bd_mapping, ~__GFP_FS);
 
 	/*
 	 * Prefer looping in the allocator rather than here, at least that
@@ -1719,16 +1719,16 @@ EXPORT_SYMBOL(create_empty_buffers);
  */
 void clean_bdev_aliases(struct block_device *bdev, sector_t block, sector_t len)
 {
-	struct inode *bd_inode = bdev->bd_inode;
-	struct address_space *bd_mapping = bd_inode->i_mapping;
+	struct address_space *bd_mapping = bdev->bd_mapping;
+	const int blkbits = bd_mapping->host->i_blkbits;
 	struct folio_batch fbatch;
-	pgoff_t index = ((loff_t)block << bd_inode->i_blkbits) / PAGE_SIZE;
+	pgoff_t index = ((loff_t)block << blkbits) / PAGE_SIZE;
 	pgoff_t end;
 	int i, count;
 	struct buffer_head *bh;
 	struct buffer_head *head;
 
-	end = ((loff_t)(block + len - 1) << bd_inode->i_blkbits) / PAGE_SIZE;
+	end = ((loff_t)(block + len - 1) << blkbits) / PAGE_SIZE;
 	folio_batch_init(&fbatch);
 	while (filemap_get_folios(bd_mapping, &index, end, &fbatch)) {
 		count = folio_batch_count(&fbatch);
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index 9901057a15ba..460690ca0174 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -183,7 +183,7 @@ static int next_buffer;
 static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset,
 				unsigned int len)
 {
-	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
+	struct address_space *mapping = sb->s_bdev->bd_mapping;
 	struct file_ra_state ra = {};
 	struct page *pages[BLKS_PER_BUF];
 	unsigned i, blocknr, buffer;
diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index 52524bd9698b..5fc03c1e2757 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -29,11 +29,9 @@ 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, erofs_blk_t blkaddr,
+void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset,
 		  enum erofs_kmap_type type)
 {
-	struct inode *inode = buf->inode;
-	erofs_off_t offset = (erofs_off_t)blkaddr << inode->i_blkbits;
 	pgoff_t index = offset >> PAGE_SHIFT;
 	struct page *page = buf->page;
 	struct folio *folio;
@@ -43,7 +41,7 @@ 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 = read_cache_folio(buf->mapping, index, NULL, NULL);
 		memalloc_nofs_restore(nofs_flag);
 		if (IS_ERR(folio))
 			return folio;
@@ -68,16 +66,16 @@ 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))
-		buf->inode = EROFS_SB(sb)->s_fscache->inode;
+		buf->mapping = EROFS_SB(sb)->s_fscache->inode->i_mapping;
 	else
-		buf->inode = sb->s_bdev->bd_inode;
+		buf->mapping = sb->s_bdev->bd_mapping;
 }
 
 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
 			 erofs_blk_t blkaddr, enum erofs_kmap_type type)
 {
 	erofs_init_metabuf(buf, sb);
-	return erofs_bread(buf, blkaddr, type);
+	return erofs_bread(buf, erofs_pos(sb, blkaddr), type);
 }
 
 static int erofs_map_blocks_flatmode(struct inode *inode,
diff --git a/fs/erofs/dir.c b/fs/erofs/dir.c
index b80abec0531a..2193a6710c8f 100644
--- a/fs/erofs/dir.c
+++ b/fs/erofs/dir.c
@@ -58,12 +58,12 @@ static int erofs_readdir(struct file *f, struct dir_context *ctx)
 	int err = 0;
 	bool initial = true;
 
-	buf.inode = dir;
+	buf.mapping = dir->i_mapping;
 	while (ctx->pos < dirsize) {
 		struct erofs_dirent *de;
 		unsigned int nameoff, maxsize;
 
-		de = erofs_bread(&buf, i, EROFS_KMAP);
+		de = erofs_bread(&buf, erofs_pos(sb, i), EROFS_KMAP);
 		if (IS_ERR(de)) {
 			erofs_err(sb, "fail to readdir of logical block %u of nid %llu",
 				  i, EROFS_I(dir)->nid);
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 21def866a482..00bbb288c08c 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -216,7 +216,7 @@ enum erofs_kmap_type {
 };
 
 struct erofs_buf {
-	struct inode *inode;
+	struct address_space *mapping;
 	struct page *page;
 	void *base;
 	enum erofs_kmap_type kmap_type;
@@ -402,7 +402,7 @@ void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
 			  erofs_off_t *offset, int *lengthp);
 void erofs_unmap_metabuf(struct erofs_buf *buf);
 void erofs_put_metabuf(struct erofs_buf *buf);
-void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
+void *erofs_bread(struct erofs_buf *buf, erofs_off_t offset,
 		  enum erofs_kmap_type type);
 void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb);
 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
diff --git a/fs/erofs/namei.c b/fs/erofs/namei.c
index f0110a78acb2..c94d0c1608a8 100644
--- a/fs/erofs/namei.c
+++ b/fs/erofs/namei.c
@@ -99,8 +99,8 @@ static void *erofs_find_target_block(struct erofs_buf *target,
 		struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
 		struct erofs_dirent *de;
 
-		buf.inode = dir;
-		de = erofs_bread(&buf, mid, EROFS_KMAP);
+		buf.mapping = dir->i_mapping;
+		de = erofs_bread(&buf, erofs_pos(dir->i_sb, mid), EROFS_KMAP);
 		if (!IS_ERR(de)) {
 			const int nameoff = nameoff_from_disk(de->nameoff, bsz);
 			const int ndirents = nameoff / sizeof(*de);
@@ -171,7 +171,7 @@ int erofs_namei(struct inode *dir, const struct qstr *name, erofs_nid_t *nid,
 
 	qn.name = name->name;
 	qn.end = name->name + name->len;
-	buf.inode = dir;
+	buf.mapping = dir->i_mapping;
 
 	ndirents = 0;
 	de = erofs_find_target_block(&buf, dir, &qn, &ndirents);
diff --git a/fs/erofs/super.c b/fs/erofs/super.c
index 044c79229a78..348ef1660e50 100644
--- a/fs/erofs/super.c
+++ b/fs/erofs/super.c
@@ -132,11 +132,11 @@ void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
 	int len, i, cnt;
 
 	*offset = round_up(*offset, 4);
-	ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
+	ptr = erofs_bread(buf, *offset, EROFS_KMAP);
 	if (IS_ERR(ptr))
 		return ptr;
 
-	len = le16_to_cpu(*(__le16 *)&ptr[erofs_blkoff(sb, *offset)]);
+	len = le16_to_cpu(*(__le16 *)ptr);
 	if (!len)
 		len = U16_MAX + 1;
 	buffer = kmalloc(len, GFP_KERNEL);
@@ -148,12 +148,12 @@ void *erofs_read_metadata(struct super_block *sb, struct erofs_buf *buf,
 	for (i = 0; i < len; i += cnt) {
 		cnt = min_t(int, sb->s_blocksize - erofs_blkoff(sb, *offset),
 			    len - i);
-		ptr = erofs_bread(buf, erofs_blknr(sb, *offset), EROFS_KMAP);
+		ptr = erofs_bread(buf, *offset, EROFS_KMAP);
 		if (IS_ERR(ptr)) {
 			kfree(buffer);
 			return ptr;
 		}
-		memcpy(buffer + i, ptr + erofs_blkoff(sb, *offset), cnt);
+		memcpy(buffer + i, ptr, cnt);
 		*offset += cnt;
 	}
 	return buffer;
diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
index b58316b49a43..a90d7d649739 100644
--- a/fs/erofs/xattr.c
+++ b/fs/erofs/xattr.c
@@ -81,13 +81,13 @@ static int erofs_init_inode_xattrs(struct inode *inode)
 	it.pos = erofs_iloc(inode) + vi->inode_isize;
 
 	/* read in shared xattr array (non-atomic, see kmalloc below) */
-	it.kaddr = erofs_bread(&it.buf, erofs_blknr(sb, it.pos), EROFS_KMAP);
+	it.kaddr = erofs_bread(&it.buf, it.pos, EROFS_KMAP);
 	if (IS_ERR(it.kaddr)) {
 		ret = PTR_ERR(it.kaddr);
 		goto out_unlock;
 	}
 
-	ih = it.kaddr + erofs_blkoff(sb, it.pos);
+	ih = it.kaddr;
 	vi->xattr_name_filter = le32_to_cpu(ih->h_name_filter);
 	vi->xattr_shared_count = ih->h_shared_count;
 	vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count,
@@ -102,16 +102,14 @@ static int erofs_init_inode_xattrs(struct inode *inode)
 	it.pos += sizeof(struct erofs_xattr_ibody_header);
 
 	for (i = 0; i < vi->xattr_shared_count; ++i) {
-		it.kaddr = erofs_bread(&it.buf, erofs_blknr(sb, it.pos),
-				       EROFS_KMAP);
+		it.kaddr = erofs_bread(&it.buf, it.pos, EROFS_KMAP);
 		if (IS_ERR(it.kaddr)) {
 			kfree(vi->xattr_shared_xattrs);
 			vi->xattr_shared_xattrs = NULL;
 			ret = PTR_ERR(it.kaddr);
 			goto out_unlock;
 		}
-		vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *)
-				(it.kaddr + erofs_blkoff(sb, it.pos)));
+		vi->xattr_shared_xattrs[i] = le32_to_cpu(*(__le32 *)it.kaddr);
 		it.pos += sizeof(__le32);
 	}
 	erofs_put_metabuf(&it.buf);
@@ -185,12 +183,11 @@ static int erofs_xattr_copy_to_buffer(struct erofs_xattr_iter *it,
 	void *src;
 
 	for (processed = 0; processed < len; processed += slice) {
-		it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos),
-					EROFS_KMAP);
+		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);
 		if (IS_ERR(it->kaddr))
 			return PTR_ERR(it->kaddr);
 
-		src = it->kaddr + erofs_blkoff(sb, it->pos);
+		src = it->kaddr;
 		slice = min_t(unsigned int, sb->s_blocksize -
 				erofs_blkoff(sb, it->pos), len - processed);
 		memcpy(it->buffer + it->buffer_ofs, src, slice);
@@ -208,8 +205,7 @@ static int erofs_listxattr_foreach(struct erofs_xattr_iter *it)
 	int err;
 
 	/* 1. handle xattr entry */
-	entry = *(struct erofs_xattr_entry *)
-			(it->kaddr + erofs_blkoff(it->sb, it->pos));
+	entry = *(struct erofs_xattr_entry *)it->kaddr;
 	it->pos += sizeof(struct erofs_xattr_entry);
 
 	base_index = entry.e_name_index;
@@ -259,8 +255,7 @@ static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
 	unsigned int slice, processed, value_sz;
 
 	/* 1. handle xattr entry */
-	entry = *(struct erofs_xattr_entry *)
-			(it->kaddr + erofs_blkoff(sb, it->pos));
+	entry = *(struct erofs_xattr_entry *)it->kaddr;
 	it->pos += sizeof(struct erofs_xattr_entry);
 	value_sz = le16_to_cpu(entry.e_value_size);
 
@@ -291,8 +286,7 @@ static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
 
 	/* 2. handle xattr name */
 	for (processed = 0; processed < entry.e_name_len; processed += slice) {
-		it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos),
-					EROFS_KMAP);
+		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);
 		if (IS_ERR(it->kaddr))
 			return PTR_ERR(it->kaddr);
 
@@ -300,7 +294,7 @@ static int erofs_getxattr_foreach(struct erofs_xattr_iter *it)
 				sb->s_blocksize - erofs_blkoff(sb, it->pos),
 				entry.e_name_len - processed);
 		if (memcmp(it->name.name + it->infix_len + processed,
-			   it->kaddr + erofs_blkoff(sb, it->pos), slice))
+			   it->kaddr, slice))
 			return -ENOATTR;
 		it->pos += slice;
 	}
@@ -336,13 +330,11 @@ static int erofs_xattr_iter_inline(struct erofs_xattr_iter *it,
 	it->pos = erofs_iloc(inode) + vi->inode_isize + xattr_header_sz;
 
 	while (remaining) {
-		it->kaddr = erofs_bread(&it->buf, erofs_blknr(it->sb, it->pos),
-					EROFS_KMAP);
+		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);
 		if (IS_ERR(it->kaddr))
 			return PTR_ERR(it->kaddr);
 
-		entry_sz = erofs_xattr_entry_size(it->kaddr +
-				erofs_blkoff(it->sb, it->pos));
+		entry_sz = erofs_xattr_entry_size(it->kaddr);
 		/* xattr on-disk corruption: xattr entry beyond xattr_isize */
 		if (remaining < entry_sz) {
 			DBG_BUGON(1);
@@ -375,8 +367,7 @@ static int erofs_xattr_iter_shared(struct erofs_xattr_iter *it,
 	for (i = 0; i < vi->xattr_shared_count; ++i) {
 		it->pos = erofs_pos(sb, sbi->xattr_blkaddr) +
 				vi->xattr_shared_xattrs[i] * sizeof(__le32);
-		it->kaddr = erofs_bread(&it->buf, erofs_blknr(sb, it->pos),
-					EROFS_KMAP);
+		it->kaddr = erofs_bread(&it->buf, it->pos, EROFS_KMAP);
 		if (IS_ERR(it->kaddr))
 			return PTR_ERR(it->kaddr);
 
@@ -492,7 +483,7 @@ int erofs_xattr_prefixes_init(struct super_block *sb)
 		return -ENOMEM;
 
 	if (sbi->packed_inode)
-		buf.inode = sbi->packed_inode;
+		buf.mapping = sbi->packed_inode->i_mapping;
 	else
 		erofs_init_metabuf(&buf, sb);
 
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 3216b920d369..283c9c3a611d 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -936,16 +936,16 @@ static int z_erofs_read_fragment(struct super_block *sb, struct page *page,
 	if (!packed_inode)
 		return -EFSCORRUPTED;
 
-	buf.inode = packed_inode;
+	buf.mapping = packed_inode->i_mapping;
 	for (; cur < end; cur += cnt, pos += cnt) {
 		cnt = min_t(unsigned int, end - cur,
 			    sb->s_blocksize - erofs_blkoff(sb, pos));
-		src = erofs_bread(&buf, erofs_blknr(sb, pos), EROFS_KMAP);
+		src = erofs_bread(&buf, pos, EROFS_KMAP);
 		if (IS_ERR(src)) {
 			erofs_put_metabuf(&buf);
 			return PTR_ERR(src);
 		}
-		memcpy_to_page(page, cur, src + erofs_blkoff(sb, pos), cnt);
+		memcpy_to_page(page, cur, src, cnt);
 	}
 	erofs_put_metabuf(&buf);
 	return 0;
diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 3985f8c33f95..ff4514e4626b 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -192,7 +192,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
 					(PAGE_SHIFT - inode->i_blkbits);
 			if (!ra_has_index(&file->f_ra, index))
 				page_cache_sync_readahead(
-					sb->s_bdev->bd_inode->i_mapping,
+					sb->s_bdev->bd_mapping,
 					&file->f_ra, file,
 					index, 1);
 			file->f_ra.prev_pos = (loff_t)index << PAGE_SHIFT;
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index 5d8055161acd..da4a82456383 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -206,7 +206,7 @@ static void ext4_journal_abort_handle(const char *caller, unsigned int line,
 
 static void ext4_check_bdev_write_error(struct super_block *sb)
 {
-	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
+	struct address_space *mapping = sb->s_bdev->bd_mapping;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	int err;
 
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 70ff6b5aae4f..c682fb927b64 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -244,7 +244,7 @@ static struct buffer_head *__ext4_sb_bread_gfp(struct super_block *sb,
 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 				   blk_opf_t op_flags)
 {
-	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
+	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping,
 			~__GFP_FS) | __GFP_MOVABLE;
 
 	return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);
@@ -253,7 +253,7 @@ struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 					    sector_t block)
 {
-	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
+	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_mapping,
 			~__GFP_FS);
 
 	return __ext4_sb_bread_gfp(sb, block, 0, gfp);
@@ -492,22 +492,6 @@ static void ext4_maybe_update_superblock(struct super_block *sb)
 		schedule_work(&EXT4_SB(sb)->s_sb_upd_work);
 }
 
-/*
- * The del_gendisk() function uninitializes the disk-specific data
- * structures, including the bdi structure, without telling anyone
- * else.  Once this happens, any attempt to call mark_buffer_dirty()
- * (for example, by ext4_commit_super), will cause a kernel OOPS.
- * This is a kludge to prevent these oops until we can put in a proper
- * hook in del_gendisk() to inform the VFS and file system layers.
- */
-static int block_device_ejected(struct super_block *sb)
-{
-	struct inode *bd_inode = sb->s_bdev->bd_inode;
-	struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
-
-	return bdi->dev == NULL;
-}
-
 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
 {
 	struct super_block		*sb = journal->j_private;
@@ -5563,7 +5547,7 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
 	 * used to detect the metadata async write error.
 	 */
 	spin_lock_init(&sbi->s_bdev_wb_lock);
-	errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
+	errseq_check_and_advance(&sb->s_bdev->bd_mapping->wb_err,
 				 &sbi->s_bdev_wb_err);
 	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
 	ext4_orphan_cleanup(sb, es);
@@ -6164,8 +6148,6 @@ static int ext4_commit_super(struct super_block *sb)
 
 	if (!sbh)
 		return -EINVAL;
-	if (block_device_ejected(sb))
-		return -ENODEV;
 
 	ext4_update_super(sb);
 
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 9f11fc1e79eb..4ea6c8bfb4e6 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1267,7 +1267,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
 	mapping = gfs2_glock2aspace(gl);
 	if (mapping) {
                 mapping->a_ops = &gfs2_meta_aops;
-		mapping->host = s->s_bdev->bd_inode;
+		mapping->host = s->s_bdev->bd_mapping->host;
 		mapping->flags = 0;
 		mapping_set_gfp_mask(mapping, GFP_NOFS);
 		mapping->i_private_data = NULL;
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index 227edbaddfbc..05975ec76d35 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -114,7 +114,7 @@ static struct gfs2_sbd *init_sbd(struct super_block *sb)
 
 	address_space_init_once(mapping);
 	mapping->a_ops = &gfs2_rgrp_aops;
-	mapping->host = sb->s_bdev->bd_inode;
+	mapping->host = sb->s_bdev->bd_mapping->host;
 	mapping->flags = 0;
 	mapping_set_gfp_mask(mapping, GFP_NOFS);
 	mapping->i_private_data = NULL;
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index b6c114c11b97..03c4b9214f56 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2009,7 +2009,7 @@ static int __jbd2_journal_erase(journal_t *journal, unsigned int flags)
 		byte_count = (block_stop - block_start + 1) *
 				journal->j_blocksize;
 
-		truncate_inode_pages_range(journal->j_dev->bd_inode->i_mapping,
+		truncate_inode_pages_range(journal->j_dev->bd_mapping,
 				byte_start, byte_stop);
 
 		if (flags & JBD2_JOURNAL_FLUSH_DISCARD) {
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 8654ab8ad534..6be7dd423fbd 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2784,7 +2784,7 @@ int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root)
 	if (!nilfs->ns_writer)
 		return -ENOMEM;
 
-	inode_attach_wb(nilfs->ns_bdev->bd_inode, NULL);
+	inode_attach_wb(nilfs->ns_bdev->bd_mapping->host, NULL);
 
 	err = nilfs_segctor_start_thread(nilfs->ns_writer);
 	if (unlikely(err))