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>

7 files changed, 63 insertions, 35 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a4b74023618d..21430b7d8f27 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -484,7 +484,8 @@ static bool btrfs_verify_folio(struct folio *folio, u64 start, u32 len)
 	    btrfs_folio_test_uptodate(fs_info, folio, start, len) ||
 	    start >= i_size_read(folio->mapping->host))
 		return true;
-	return fsverity_verify_folio(folio);
+	return fsverity_verify_folio(*fsverity_info_addr(folio->mapping->host),
+			folio);
 }
 
 static void end_folio_read(struct folio *folio, bool uptodate, u64 start, u32 len)
diff --git a/fs/buffer.c b/fs/buffer.c
index 838c0c571022..3982253b6805 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -309,9 +309,11 @@ static void verify_bh(struct work_struct *work)
 	struct postprocess_bh_ctx *ctx =
 		container_of(work, struct postprocess_bh_ctx, work);
 	struct buffer_head *bh = ctx->bh;
+	struct inode *inode = bh->b_folio->mapping->host;
 	bool valid;
 
-	valid = fsverity_verify_blocks(bh->b_folio, bh->b_size, bh_offset(bh));
+	valid = fsverity_verify_blocks(*fsverity_info_addr(inode), bh->b_folio,
+				       bh->b_size, bh_offset(bh));
 	end_buffer_async_read(bh, valid);
 	kfree(ctx);
 }
diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
index 3049a66a05c8..b0a3c9236368 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -97,6 +97,7 @@ static void verity_work(struct work_struct *work)
 	struct bio_post_read_ctx *ctx =
 		container_of(work, struct bio_post_read_ctx, work);
 	struct bio *bio = ctx->bio;
+	struct inode *inode = bio_first_folio_all(bio)->mapping->host;
 
 	/*
 	 * fsverity_verify_bio() may call readahead() again, and although verity
@@ -109,7 +110,7 @@ static void verity_work(struct work_struct *work)
 	mempool_free(ctx, bio_post_read_ctx_pool);
 	bio->bi_private = NULL;
 
-	fsverity_verify_bio(bio);
+	fsverity_verify_bio(*fsverity_info_addr(inode), bio);
 
 	__read_end_io(bio);
 }
@@ -331,7 +332,9 @@ static int ext4_mpage_readpages(struct inode *inode,
 					  folio_size(folio));
 			if (first_hole == 0) {
 				if (ext4_need_verity(inode, folio->index) &&
-				    !fsverity_verify_folio(folio))
+				    !fsverity_verify_folio(
+						*fsverity_info_addr(inode),
+						folio))
 					goto set_error_page;
 				folio_end_read(folio, true);
 				continue;
@@ -409,7 +412,8 @@ int ext4_read_folio(struct file *file, struct folio *folio)
 	}
 
 	if (ext4_need_verity(inode, folio->index))
-		fsverity_readahead(inode, folio->index, folio_nr_pages(folio));
+		fsverity_readahead(*fsverity_info_addr(inode), folio->index,
+				   folio_nr_pages(folio));
 	return ext4_mpage_readpages(inode, NULL, folio);
 }
 
@@ -422,8 +426,8 @@ void ext4_readahead(struct readahead_control *rac)
 		return;
 
 	if (ext4_need_verity(inode, readahead_index(rac)))
-		fsverity_readahead(inode, readahead_index(rac),
-				   readahead_count(rac));
+		fsverity_readahead(*fsverity_info_addr(inode),
+				   readahead_index(rac), readahead_count(rac));
 	ext4_mpage_readpages(inode, rac, NULL);
 }
 
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 40a62f1dee4d..3de4a7e66959 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -1814,7 +1814,9 @@ static void f2fs_verify_cluster(struct work_struct *work)
 		if (!rpage)
 			continue;
 
-		if (fsverity_verify_page(rpage))
+		if (fsverity_verify_page(
+				*fsverity_info_addr(rpage->mapping->host),
+				rpage))
 			SetPageUptodate(rpage);
 		else
 			ClearPageUptodate(rpage);
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 58d8a311ef2c..3593208c99db 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -185,15 +185,19 @@ static void f2fs_verify_bio(struct work_struct *work)
 
 		bio_for_each_folio_all(fi, bio) {
 			struct folio *folio = fi.folio;
+			struct fsverity_info *vi =
+				*fsverity_info_addr(folio->mapping->host);
 
 			if (!f2fs_is_compressed_page(folio) &&
-			    !fsverity_verify_page(&folio->page)) {
+			    !fsverity_verify_page(vi, &folio->page)) {
 				bio->bi_status = BLK_STS_IOERR;
 				break;
 			}
 		}
 	} else {
-		fsverity_verify_bio(bio);
+		struct inode *inode = bio_first_folio_all(bio)->mapping->host;
+
+		fsverity_verify_bio(*fsverity_info_addr(inode), bio);
 	}
 
 	f2fs_finish_read_bio(bio, true);
@@ -2121,7 +2125,9 @@ got_it:
 zero_out:
 		folio_zero_segment(folio, 0, folio_size(folio));
 		if (f2fs_need_verity(inode, index) &&
-		    !fsverity_verify_folio(folio)) {
+		    !fsverity_verify_folio(
+				*fsverity_info_addr(folio->mapping->host),
+				folio)) {
 			ret = -EIO;
 			goto out;
 		}
@@ -2475,7 +2481,8 @@ static int f2fs_read_data_folio(struct file *file, struct folio *folio)
 	}
 
 	if (f2fs_need_verity(inode, folio->index))
-		fsverity_readahead(inode, folio->index, folio_nr_pages(folio));
+		fsverity_readahead(*fsverity_info_addr(inode), folio->index,
+				   folio_nr_pages(folio));
 	return f2fs_mpage_readpages(inode, NULL, folio);
 }
 
@@ -2493,8 +2500,8 @@ static void f2fs_readahead(struct readahead_control *rac)
 		return;
 
 	if (f2fs_need_verity(inode, readahead_index(rac)))
-		fsverity_readahead(inode, readahead_index(rac),
-				   readahead_count(rac));
+		fsverity_readahead(*fsverity_info_addr(inode),
+				   readahead_index(rac), readahead_count(rac));
 	f2fs_mpage_readpages(inode, rac, NULL);
 }
 
diff --git a/fs/verity/verify.c b/fs/verity/verify.c
index 31045d83ace4..37e000f01c18 100644
--- a/fs/verity/verify.c
+++ b/fs/verity/verify.c
@@ -38,7 +38,7 @@ static struct workqueue_struct *fsverity_read_workqueue;
 
 /**
  * fsverity_readahead() - kick off readahead on fsverity hashes
- * @inode:		inode that is being read
+ * @vi:			fsverity_info for the inode to be read
  * @index:		first file data page index that is being read
  * @nr_pages:		number of file data pages to be read
  *
@@ -49,10 +49,10 @@ static struct workqueue_struct *fsverity_read_workqueue;
  * ensure that the hashes are already cached on completion of the file data
  * read if possible.
  */
-void fsverity_readahead(struct inode *inode, pgoff_t index,
+void fsverity_readahead(struct fsverity_info *vi, pgoff_t index,
 			unsigned long nr_pages)
 {
-	const struct fsverity_info *vi = *fsverity_info_addr(inode);
+	struct inode *inode = vi->inode;
 	const struct merkle_tree_params *params = &vi->tree_params;
 	u64 start_hidx = (u64)index << params->log_blocks_per_page;
 	u64 end_hidx =
@@ -314,11 +314,9 @@ error:
 
 static void
 fsverity_init_verification_context(struct fsverity_verification_context *ctx,
-				   struct inode *inode)
+				   struct fsverity_info *vi)
 {
-	struct fsverity_info *vi = *fsverity_info_addr(inode);
-
-	ctx->inode = inode;
+	ctx->inode = vi->inode;
 	ctx->vi = vi;
 	ctx->num_pending = 0;
 	if (vi->tree_params.hash_alg->algo_id == HASH_ALGO_SHA256 &&
@@ -398,6 +396,7 @@ static bool fsverity_add_data_blocks(struct fsverity_verification_context *ctx,
 
 /**
  * fsverity_verify_blocks() - verify data in a folio
+ * @vi: fsverity_info for the inode to be read
  * @folio: the folio containing the data to verify
  * @len: the length of the data to verify in the folio
  * @offset: the offset of the data to verify in the folio
@@ -408,11 +407,12 @@ static bool fsverity_add_data_blocks(struct fsverity_verification_context *ctx,
  *
  * Return: %true if the data is valid, else %false.
  */
-bool fsverity_verify_blocks(struct folio *folio, size_t len, size_t offset)
+bool fsverity_verify_blocks(struct fsverity_info *vi, struct folio *folio,
+			    size_t len, size_t offset)
 {
 	struct fsverity_verification_context ctx;
 
-	fsverity_init_verification_context(&ctx, folio->mapping->host);
+	fsverity_init_verification_context(&ctx, vi);
 
 	if (fsverity_add_data_blocks(&ctx, folio, len, offset) &&
 	    fsverity_verify_pending_blocks(&ctx))
@@ -425,6 +425,7 @@ EXPORT_SYMBOL_GPL(fsverity_verify_blocks);
 #ifdef CONFIG_BLOCK
 /**
  * fsverity_verify_bio() - verify a 'read' bio that has just completed
+ * @vi: fsverity_info for the inode to be read
  * @bio: the bio to verify
  *
  * Verify the bio's data against the file's Merkle tree.  All bio data segments
@@ -437,13 +438,12 @@ EXPORT_SYMBOL_GPL(fsverity_verify_blocks);
  * filesystems) must instead call fsverity_verify_page() directly on each page.
  * All filesystems must also call fsverity_verify_page() on holes.
  */
-void fsverity_verify_bio(struct bio *bio)
+void fsverity_verify_bio(struct fsverity_info *vi, struct bio *bio)
 {
-	struct inode *inode = bio_first_folio_all(bio)->mapping->host;
 	struct fsverity_verification_context ctx;
 	struct folio_iter fi;
 
-	fsverity_init_verification_context(&ctx, inode);
+	fsverity_init_verification_context(&ctx, vi);
 
 	bio_for_each_folio_all(fi, bio) {
 		if (!fsverity_add_data_blocks(&ctx, fi.folio, fi.length,
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);