Re: [RFC PATCH] folio: Add a function to get the host inode for a folio

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On Thu, Aug 12, 2021 at 10:42:11PM +0100, David Howells wrote:
> Add a convenience function, folio_inode() that will get the host inode from
> a folio's mapping.
> 
> [Includes netfs and afs changes for illustration, but I'd move those to a
> different patch].

Seems like a good idea.  Across my entire devel tree, I find 36
occurrences:

$ git log -p origin..devel |grep folio.*mapping.*host
+	struct inode *inode = folio->mapping->host;
+	struct inode *dir = folio->mapping->host;
+	unsigned int nr_blocks = i_blocks_per_folio(page->mapping->host, folio);
+	struct btrfs_fs_info *fs_info = btrfs_sb(folio->mapping->host->i_sb);
+	struct afs_vnode *dvnode = AFS_FS_I(folio->mapping->host);
+	tree = &BTRFS_I(folio->mapping->host)->io_tree;
+		btrfs_warn(BTRFS_I(folio->mapping->host)->root->fs_info,
+	struct btrfs_inode *inode = BTRFS_I(folio->mapping->host);
+	inode = folio->mapping->host;
+	struct cifsInodeInfo *cifsi = CIFS_I(folio->mapping->host);
+	struct inode *inode = folio->mapping->host;
+	struct gfs2_sbd *sdp = GFS2_SB(folio->mapping->host);
+	trace_iomap_invalidate_folio(folio->mapping->host, offset, len);
+	nfs_wb_page_cancel(folio_file_mapping(folio)->host, &folio->page);
+	nfs_fscache_invalidate_page(&folio->page, folio->mapping->host);
+	struct inode *inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	int err = fuse_readlink_page(folio->mapping->host, &folio->page);
+	struct inode *inode = folio->mapping->host;
+	struct btrfs_inode *inode = BTRFS_I(folios[0]->mapping->host);
+	struct inode *inode = folio->mapping->host;
+		__entry->i_ino = folio->mapping->host->i_ino;
+		if (folio->mapping->host->i_sb)
+			__entry->s_dev = folio->mapping->host->i_sb->s_dev;
+			__entry->s_dev = folio->mapping->host->i_rdev;
+	struct inode *inode = folio->mapping->host;
+	struct inode		*inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	struct inode *inode = folio->mapping->host;
+	trace_iomap_invalidatepage(folio->mapping->host, offset, len);
+	trace_iomap_releasepage(folio->mapping->host, folio_pos(folio),
+	struct inode *inode = folio->mapping->host;
+	if (folio->mapping->host->i_sb->s_iflags & SB_I_STABLE_WRITES)

It's only two characters less, but it seems worth doing.



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