[PATCH 12/29] fsverity: pass the new tree size and block size to ->begin_enable_verity

["Darrick J. Wong" <djwong@kernel.org>]

From: Darrick J. Wong <djwong@kernel.org>

When starting up the process of enabling fsverity on a file, pass the
new size of the merkle tree and the merkle tree block size to the fs
implementation.  XFS will want this information later to try to clean
out a failed previous enablement attempt.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/btrfs/verity.c        |    3 ++-
 fs/ext4/verity.c         |    3 ++-
 fs/f2fs/verity.c         |    3 ++-
 fs/verity/enable.c       |    3 ++-
 include/linux/fsverity.h |    5 ++++-
 5 files changed, 12 insertions(+), 5 deletions(-)


diff --git a/fs/btrfs/verity.c b/fs/btrfs/verity.c
index 966630523502..c52f32bd43c7 100644
--- a/fs/btrfs/verity.c
+++ b/fs/btrfs/verity.c
@@ -579,7 +579,8 @@ static int finish_verity(struct btrfs_inode *inode, const void *desc,
  *
  * Returns 0 on success, negative error code on failure.
  */
-static int btrfs_begin_enable_verity(struct file *filp)
+static int btrfs_begin_enable_verity(struct file *filp, u64 merkle_tree_size,
+				     unsigned int tree_blocksize)
 {
 	struct btrfs_inode *inode = BTRFS_I(file_inode(filp));
 	struct btrfs_root *root = inode->root;
diff --git a/fs/ext4/verity.c b/fs/ext4/verity.c
index da2095a81349..a8ae8c912cb5 100644
--- a/fs/ext4/verity.c
+++ b/fs/ext4/verity.c
@@ -99,7 +99,8 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
 	return 0;
 }
 
-static int ext4_begin_enable_verity(struct file *filp)
+static int ext4_begin_enable_verity(struct file *filp, u64 merkle_tree_size,
+				    unsigned int tree_blocksize)
 {
 	struct inode *inode = file_inode(filp);
 	const int credits = 2; /* superblock and inode for ext4_orphan_add() */
diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index b4461b9f47a3..f6ad6523ce95 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -115,7 +115,8 @@ struct fsverity_descriptor_location {
 	__le64 pos;
 };
 
-static int f2fs_begin_enable_verity(struct file *filp)
+static int f2fs_begin_enable_verity(struct file *filp, u64 merkle_tree_size,
+				    unsigned int tree_blocksize)
 {
 	struct inode *inode = file_inode(filp);
 	int err;
diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index 945eba0092ab..496a361c0a81 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -237,7 +237,8 @@ static int enable_verity(struct file *filp,
 	if (IS_VERITY(inode))
 		err = -EEXIST;
 	else
-		err = vops->begin_enable_verity(filp);
+		err = vops->begin_enable_verity(filp, params.tree_size,
+				      params.block_size);
 	inode_unlock(inode);
 	if (err)
 		goto out;
diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
index d12a95623614..c5f3564f2cb8 100644
--- a/include/linux/fsverity.h
+++ b/include/linux/fsverity.h
@@ -80,6 +80,8 @@ struct fsverity_operations {
 	 * Begin enabling verity on the given file.
 	 *
 	 * @filp: a readonly file descriptor for the file
+	 * @merkle_tree_size: total bytes the new Merkle tree will take up
+	 * @tree_blocksize: the new Merkle tree block size
 	 *
 	 * The filesystem must do any needed filesystem-specific preparations
 	 * for enabling verity, e.g. evicting inline data.  It also must return
@@ -89,7 +91,8 @@ struct fsverity_operations {
 	 *
 	 * Return: 0 on success, -errno on failure
 	 */
-	int (*begin_enable_verity)(struct file *filp);
+	int (*begin_enable_verity)(struct file *filp, u64 merkle_tree_size,
+				   unsigned int tree_blocksize);
 
 	/**
 	 * End enabling verity on the given file.