fsverity: push out fsverity_info lookup

Pass a struct fsverity_info to the verification and readahead helpers,
and push the lookup into the callers.  Right now this is a very dumb
almost mechanic move that open codes a lot of fsverity_info_addr() calls
in the file systems.  The subsequent patches will clean this up.

This prepares for reducing the number of fsverity_info lookups, which
will allow to amortize them better when using a more expensive lookup
method.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Acked-by: David Sterba <dsterba@suse.com> # btrfs
Link: https://lore.kernel.org/r/20260202060754.270269-7-hch@lst.de
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

1 files changed, 21 insertions, 9 deletions

diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index 722a42754a86..076228a9fd12 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -197,12 +197,20 @@ int fsverity_ioctl_read_metadata(struct file *filp, const void __user *uarg);
 
 /* verify.c */
 
-bool fsverity_verify_blocks(struct folio *folio, size_t len, size_t offset);
-void fsverity_verify_bio(struct bio *bio);
+bool fsverity_verify_blocks(struct fsverity_info *vi, struct folio *folio,
+			    size_t len, size_t offset);
+void fsverity_verify_bio(struct fsverity_info *vi, struct bio *bio);
 void fsverity_enqueue_verify_work(struct work_struct *work);
 
 #else /* !CONFIG_FS_VERITY */
 
+/*
+ * Provide a stub to allow code using this to compile.  All callsites should be
+ * guarded by compiler dead code elimination, and this forces a link error if
+ * not.
+ */
+struct fsverity_info **fsverity_info_addr(const struct inode *inode);
+
 static inline struct fsverity_info *fsverity_get_info(const struct inode *inode)
 {
 	return NULL;
@@ -251,14 +259,16 @@ static inline int fsverity_ioctl_read_metadata(struct file *filp,
 
 /* verify.c */
 
-static inline bool fsverity_verify_blocks(struct folio *folio, size_t len,
+static inline bool fsverity_verify_blocks(struct fsverity_info *vi,
+					  struct folio *folio, size_t len,
 					  size_t offset)
 {
 	WARN_ON_ONCE(1);
 	return false;
 }
 
-static inline void fsverity_verify_bio(struct bio *bio)
+static inline void fsverity_verify_bio(struct fsverity_info *vi,
+				       struct bio *bio)
 {
 	WARN_ON_ONCE(1);
 }
@@ -270,14 +280,16 @@ static inline void fsverity_enqueue_verify_work(struct work_struct *work)
 
 #endif	/* !CONFIG_FS_VERITY */
 
-static inline bool fsverity_verify_folio(struct folio *folio)
+static inline bool fsverity_verify_folio(struct fsverity_info *vi,
+					 struct folio *folio)
 {
-	return fsverity_verify_blocks(folio, folio_size(folio), 0);
+	return fsverity_verify_blocks(vi, folio, folio_size(folio), 0);
 }
 
-static inline bool fsverity_verify_page(struct page *page)
+static inline bool fsverity_verify_page(struct fsverity_info *vi,
+					struct page *page)
 {
-	return fsverity_verify_blocks(page_folio(page), PAGE_SIZE, 0);
+	return fsverity_verify_blocks(vi, page_folio(page), PAGE_SIZE, 0);
 }
 
 /**
@@ -319,7 +331,7 @@ static inline int fsverity_file_open(struct inode *inode, struct file *filp)
 }
 
 void fsverity_cleanup_inode(struct inode *inode);
-void fsverity_readahead(struct inode *inode, pgoff_t index,
+void fsverity_readahead(struct fsverity_info *vi, pgoff_t index,
 			unsigned long nr_pages);
 
 struct page *generic_read_merkle_tree_page(struct inode *inode, pgoff_t index);