btrfs: constify pointer parameters where applicable

We can add const to many parameters, this is for clarity and minor
addition to safety. There are some minor effects, in the assembly
code and .ko measured on release config. This patch does not cover all
possible conversions.

Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index 155570e20f45..5c8e64eaf48b 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -27,7 +27,7 @@ struct prop_handler {
 	int (*validate)(const struct btrfs_inode *inode, const char *value,
 			size_t len);
 	int (*apply)(struct inode *inode, const char *value, size_t len);
-	const char *(*extract)(struct inode *inode);
+	const char *(*extract)(const struct inode *inode);
 	bool (*ignore)(const struct btrfs_inode *inode);
 	int inheritable;
 };
@@ -359,7 +359,7 @@ static bool prop_compression_ignore(const struct btrfs_inode *inode)
 	return false;
 }
 
-static const char *prop_compression_extract(struct inode *inode)
+static const char *prop_compression_extract(const struct inode *inode)
 {
 	switch (BTRFS_I(inode)->prop_compress) {
 	case BTRFS_COMPRESS_ZLIB:
@@ -385,7 +385,7 @@ static struct prop_handler prop_handlers[] = {
 };
 
 int btrfs_inode_inherit_props(struct btrfs_trans_handle *trans,
-			      struct inode *inode, struct inode *parent)
+			      struct inode *inode, const struct inode *parent)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 	struct btrfs_fs_info *fs_info = root->fs_info;