[PATCH v5 08/25] iomap: obtain fsverity info for read path

[Andrey Albershteyn <aalbersh@kernel.org>]

Obtain fsverity info for folios with file data. Filesystem can pass vi
down to ioend and then to fsverity for verification. XFS will use it in
further patch for fsverity integration.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 fs/iomap/buffered-io.c | 7 +++++++
 include/linux/iomap.h  | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 6d17858ffaae..bcfbfbf5cf7c 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -9,6 +9,7 @@
 #include <linux/swap.h>
 #include <linux/migrate.h>
 #include <linux/fserror.h>
+#include <linux/fsverity.h>
 #include "internal.h"
 #include "trace.h"
 
@@ -599,6 +600,9 @@ void iomap_read_folio(const struct iomap_ops *ops,
 
 	trace_iomap_readpage(iter.inode, 1);
 
+	if (iter.pos < i_size_read(iter.inode))
+		ctx->vi = fsverity_get_info(iter.inode);
+
 	while ((ret = iomap_iter(&iter, ops)) > 0)
 		iter.status = iomap_read_folio_iter(&iter, ctx,
 				&bytes_submitted);
@@ -666,6 +670,9 @@ void iomap_readahead(const struct iomap_ops *ops,
 
 	trace_iomap_readahead(rac->mapping->host, readahead_count(rac));
 
+	if (iter.pos < i_size_read(iter.inode))
+		ctx->vi = fsverity_get_info(iter.inode);
+
 	while (iomap_iter(&iter, ops) > 0)
 		iter.status = iomap_readahead_iter(&iter, ctx,
 					&cur_bytes_submitted);
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index dc39837b0d45..89e5a7abc012 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -432,6 +432,7 @@ struct iomap_ioend {
 	loff_t			io_offset;	/* offset in the file */
 	sector_t		io_sector;	/* start sector of ioend */
 	void			*io_private;	/* file system private data */
+	struct fsverity_info	*io_vi;		/* fsverity info */
 	struct bio		io_bio;		/* MUST BE LAST! */
 };
 
@@ -506,6 +507,7 @@ struct iomap_read_folio_ctx {
 	struct readahead_control *rac;
 	void			*read_ctx;
 	loff_t			read_ctx_file_offset;
+	struct fsverity_info	*vi;
 };
 
 struct iomap_read_ops {
-- 
2.51.2