[PATCH 06/11] fsverity: push out fsverity_info lookup

[Christoph Hellwig <hch@lst.de>]

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 int 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>
---
 fs/btrfs/extent_io.c     |  4 +++-
 fs/buffer.c              |  4 +++-
 fs/ext4/readpage.c       | 11 ++++++++---
 fs/f2fs/compress.c       |  4 +++-
 fs/f2fs/data.c           | 15 +++++++++++----
 fs/verity/verify.c       | 26 ++++++++++++++------------
 include/linux/fsverity.h | 24 +++++++++++++++---------
 7 files changed, 57 insertions(+), 31 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a4b74023618d..6e65e2cdf950 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)
@@ -578,6 +579,7 @@ static void end_bbio_data_read(struct btrfs_bio *bbio)
 	struct folio_iter fi;
 
 	ASSERT(!bio_flagged(bio, BIO_CLONED));
+
 	bio_for_each_folio_all(fi, &bbio->bio) {
 		bool uptodate = !bio->bi_status;
 		struct folio *folio = fi.folio;
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 574584123b8a..02f918cf1945 100644
--- a/fs/ext4/readpage.c
+++ b/fs/ext4/readpage.c
@@ -96,6 +96,7 @@ 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
@@ -108,7 +109,7 @@ 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);
 }
@@ -244,7 +245,8 @@ int ext4_mpage_readpages(struct inode *inode,
 
 		if (first_folio) {
 			if (ext4_need_verity(inode, folio->index))
-				fsverity_readahead(folio, nr_pages);
+				fsverity_readahead(*fsverity_info_addr(inode),
+						folio, nr_pages);
 			first_folio = false;
 		}
 
@@ -335,8 +337,11 @@ int ext4_mpage_readpages(struct inode *inode,
 			folio_zero_segment(folio, first_hole << blkbits,
 					  folio_size(folio));
 			if (first_hole == 0) {
+				struct fsverity_info *vi =
+					*fsverity_info_addr(folio->mapping->host);
+
 				if (ext4_need_verity(inode, folio->index) &&
-				    !fsverity_verify_folio(folio))
+				    !fsverity_verify_folio(vi, folio))
 					goto set_error_page;
 				folio_end_read(folio, true);
 				continue;
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 7b68bf22989d..0c269b875e0c 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 49bdc7e771f2..bca1e34d327a 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 @@ static int f2fs_read_single_page(struct inode *inode, struct folio *folio,
 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;
 		}
@@ -2386,7 +2392,8 @@ static int f2fs_mpage_readpages(struct inode *inode,
 
 		if (first_folio) {
 			if (f2fs_need_verity(inode, folio->index))
-				fsverity_readahead(folio, nr_pages);
+				fsverity_readahead(*fsverity_info_addr(inode),
+						folio, nr_pages);
 			first_folio = false;
 		}
 
diff --git a/fs/verity/verify.c b/fs/verity/verify.c
index 7ccd906e2b28..74792cd8b037 100644
--- a/fs/verity/verify.c
+++ b/fs/verity/verify.c
@@ -71,6 +71,7 @@ EXPORT_SYMBOL_GPL(fsverity_readahead);
 
 /**
  * fsverity_readahead() - kick off readahead on fsverity hashes
+ * @vi:			fsverity_info for the inode to be read
  * @folio:		first folio that is being read
  * @nr_pages:		number of data pages to read
  *
@@ -78,12 +79,11 @@ EXPORT_SYMBOL_GPL(fsverity_readahead);
  * ->read_folio and ->readahead methods to ensure that the hashes are
  * already cached on completion of the file data read if possible.
  */
-void fsverity_readahead(struct folio *folio, unsigned long nr_pages)
+void fsverity_readahead(struct fsverity_info *vi, struct folio *folio,
+			unsigned long nr_pages)
 {
-	struct inode *inode = folio->mapping->host;
-
-	return __fsverity_readahead(inode, *fsverity_info_addr(inode),
-			folio_pos(folio), nr_pages);
+	return __fsverity_readahead(folio->mapping->host, vi, folio_pos(folio),
+			nr_pages);
 }
 
 /*
@@ -319,10 +319,9 @@ static bool verify_data_block(struct inode *inode, struct fsverity_info *vi,
 
 static void
 fsverity_init_verification_context(struct fsverity_verification_context *ctx,
-				   struct inode *inode)
+				   struct inode *inode,
+				   struct fsverity_info *vi)
 {
-	struct fsverity_info *vi = *fsverity_info_addr(inode);
-
 	ctx->inode = inode;
 	ctx->vi = vi;
 	ctx->num_pending = 0;
@@ -403,6 +402,7 @@ 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
@@ -413,11 +413,12 @@ 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, folio->mapping->host, vi);
 
 	if (fsverity_add_data_blocks(&ctx, folio, len, offset) &&
 	    fsverity_verify_pending_blocks(&ctx))
@@ -430,6 +431,7 @@ 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
@@ -442,13 +444,13 @@ 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, inode, 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 862fea8a2eb1..c044285b6aff 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -197,8 +197,9 @@ 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 */
@@ -251,14 +252,16 @@ 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 +273,16 @@ 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 +324,8 @@ static inline int fsverity_file_open(struct inode *inode, struct file *filp)
 }
 
 void fsverity_cleanup_inode(struct inode *inode);
-void fsverity_readahead(struct folio *folio, unsigned long nr_pages);
+void fsverity_readahead(struct fsverity_info *vi, struct folio *folio,
+		unsigned long nr_pages);
 
 struct page *generic_read_merkle_tree_page(struct inode *inode, pgoff_t index);
 void generic_readahead_merkle_tree(struct inode *inode, pgoff_t index,
-- 
2.47.3