[PATCH] btrfs: improve messages when updating feature flags

[David Sterba <dsterba@suse.com>]

Currently the messages printed after setting an incompat feature are
cryptis, we can easily make it better as the textual description is
passed to the helpers. Old:

  setting 128 feature flag

updated:

  setting incompat feature flag for RAID56 (0x80)

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/ctree.h | 40 ++++++++++++++++++++++++----------------
 1 file changed, 24 insertions(+), 16 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index fb7435533478..6df4911c8f8d 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3620,10 +3620,11 @@ do {									\
 /* compatibility and incompatibility defines */
 
 #define btrfs_set_fs_incompat(__fs_info, opt) \
-	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
+	__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
+				#opt)
 
 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
-					   u64 flag)
+					   u64 flag, const char* name)
 {
 	struct btrfs_super_block *disk_super;
 	u64 features;
@@ -3636,18 +3637,20 @@ static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
 		if (!(features & flag)) {
 			features |= flag;
 			btrfs_set_super_incompat_flags(disk_super, features);
-			btrfs_info(fs_info, "setting %llu feature flag",
-					 flag);
+			btrfs_info(fs_info,
+				"setting incompat feature flag for %s (0x%llx)",
+				name, flag);
 		}
 		spin_unlock(&fs_info->super_lock);
 	}
 }
 
 #define btrfs_clear_fs_incompat(__fs_info, opt) \
-	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
+	__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \
+				  #opt)
 
 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
-					     u64 flag)
+					     u64 flag, const char* name)
 {
 	struct btrfs_super_block *disk_super;
 	u64 features;
@@ -3660,8 +3663,9 @@ static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
 		if (features & flag) {
 			features &= ~flag;
 			btrfs_set_super_incompat_flags(disk_super, features);
-			btrfs_info(fs_info, "clearing %llu feature flag",
-					 flag);
+			btrfs_info(fs_info,
+				"clearing incompat feature flag for %s (0x%llx)",
+				name, flag);
 		}
 		spin_unlock(&fs_info->super_lock);
 	}
@@ -3678,10 +3682,11 @@ static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
 }
 
 #define btrfs_set_fs_compat_ro(__fs_info, opt) \
-	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
+	__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
+				 #opt)
 
 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
-					    u64 flag)
+					    u64 flag, const char *name)
 {
 	struct btrfs_super_block *disk_super;
 	u64 features;
@@ -3694,18 +3699,20 @@ static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
 		if (!(features & flag)) {
 			features |= flag;
 			btrfs_set_super_compat_ro_flags(disk_super, features);
-			btrfs_info(fs_info, "setting %llu ro feature flag",
-				   flag);
+			btrfs_info(fs_info,
+				"setting compat-ro feature flag for %s (0x%llx)",
+				name, flag);
 		}
 		spin_unlock(&fs_info->super_lock);
 	}
 }
 
 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \
-	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
+	__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \
+				   #opt)
 
 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
-					      u64 flag)
+					      u64 flag, const char *name)
 {
 	struct btrfs_super_block *disk_super;
 	u64 features;
@@ -3718,8 +3725,9 @@ static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
 		if (features & flag) {
 			features &= ~flag;
 			btrfs_set_super_compat_ro_flags(disk_super, features);
-			btrfs_info(fs_info, "clearing %llu ro feature flag",
-				   flag);
+			btrfs_info(fs_info,
+				"clearing compat-ro feature flag for %s (0x%llx)",
+				name, flag);
 		}
 		spin_unlock(&fs_info->super_lock);
 	}
-- 
2.21.0