[PATCH 15/40] fsverity: box up the write_merkle_tree_block parameters too

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Box up the tree write request parameters into a structure so that we can
add more in the next few patches.

Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
 fs/btrfs/verity.c        |    6 ++++--
 fs/ext4/verity.c         |    7 +++++--
 fs/f2fs/verity.c         |    7 +++++--
 fs/verity/enable.c       |    5 ++++-
 include/linux/fsverity.h |   21 ++++++++++++++++++---
 5 files changed, 36 insertions(+), 10 deletions(-)


diff --git a/fs/btrfs/verity.c b/fs/btrfs/verity.c
index c52f32bd43c7..70794c608581 100644
--- a/fs/btrfs/verity.c
+++ b/fs/btrfs/verity.c
@@ -791,9 +791,11 @@ static struct page *btrfs_read_merkle_tree_page(struct inode *inode,
  *
  * Returns 0 on success or negative error code on failure
  */
-static int btrfs_write_merkle_tree_block(struct inode *inode, const void *buf,
-					 u64 pos, unsigned int size)
+static int btrfs_write_merkle_tree_block(const struct fsverity_writemerkle *req,
+					 const void *buf, u64 pos,
+					 unsigned int size)
 {
+	struct inode *inode = req->inode;
 	loff_t merkle_pos = merkle_file_pos(inode);
 
 	if (merkle_pos < 0)
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index a8ae8c912cb5..27eb2d51cce2 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -382,9 +382,12 @@ static struct page *ext4_read_merkle_tree_page(struct inode *inode,
 	return folio_file_page(folio, index);
 }
 
-static int ext4_write_merkle_tree_block(struct inode *inode, const void *buf,
-					u64 pos, unsigned int size)
+static int ext4_write_merkle_tree_block(const struct fsverity_writemerkle *req,
+					const void *buf, u64 pos,
+					unsigned int size)
 {
+	struct inode *inode = req->inode;
+
 	pos += ext4_verity_metadata_pos(inode);
 
 	return pagecache_write(inode, buf, size, pos);
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index f6ad6523ce95..923d7a09b2f4 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -277,9 +277,12 @@ static struct page *f2fs_read_merkle_tree_page(struct inode *inode,
 	return page;
 }
 
-static int f2fs_write_merkle_tree_block(struct inode *inode, const void *buf,
-					u64 pos, unsigned int size)
+static int f2fs_write_merkle_tree_block(const struct fsverity_writemerkle *req,
+					const void *buf, u64 pos,
+					unsigned int size)
 {
+	struct inode *inode = req->inode;
+
 	pos += f2fs_verity_metadata_pos(inode);
 
 	return pagecache_write(inode, buf, size, pos);
diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index 496a361c0a81..8dcfefc848ee 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -50,10 +50,13 @@ static int write_merkle_tree_block(struct inode *inode, const u8 *buf,
 				   unsigned long index,
 				   const struct merkle_tree_params *params)
 {
+	struct fsverity_writemerkle req = {
+		.inode = inode,
+	};
 	u64 pos = (u64)index << params->log_blocksize;
 	int err;
 
-	err = inode->i_sb->s_vop->write_merkle_tree_block(inode, buf, pos,
+	err = inode->i_sb->s_vop->write_merkle_tree_block(&req, buf, pos,
 							  params->block_size);
 	if (err)
 		fsverity_err(inode, "Error %d writing Merkle tree block %lu",
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index 026e4f72290e..0dded1fcf2b1 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -75,6 +75,20 @@ struct fsverity_readmerkle {
 	u8 log_blocksize;
 };
 
+/**
+ * struct fsverity_writemerkle - Request to write a Merkle Tree block buffer
+ * @inode: the inode to read
+ * @level: level of the block; level 0 are the leaves
+ * @num_levels: number of levels in the tree total
+ * @log_blocksize: log2 of the size of the block
+ */
+struct fsverity_writemerkle {
+	struct inode *inode;
+	int level;
+	int num_levels;
+	u8 log_blocksize;
+};
+
 /* Verity operations for filesystems */
 struct fsverity_operations {
 
@@ -185,7 +199,7 @@ struct fsverity_operations {
 	/**
 	 * Write a Merkle tree block to the given inode.
 	 *
-	 * @inode: the inode for which the Merkle tree is being built
+	 * @req: write request; see struct fsverity_writemerkle
 	 * @buf: the Merkle tree block to write
 	 * @pos: the position of the block in the Merkle tree (in bytes)
 	 * @size: the Merkle tree block size (in bytes)
@@ -195,8 +209,9 @@ struct fsverity_operations {
 	 *
 	 * Return: 0 on success, -errno on failure
 	 */
-	int (*write_merkle_tree_block)(struct inode *inode, const void *buf,
-				       u64 pos, unsigned int size);
+	int (*write_merkle_tree_block)(const struct fsverity_writemerkle *req,
+				       const void *buf, u64 pos,
+				       unsigned int size);
 
 	/**
 	 * Release the reference to a Merkle tree block