btrfs: remove failed_start argument from set_extent_bit

This is only used for internal locking related helpers, everybody else
just passes in NULL.  I've changed set_extent_bit to __set_extent_bit
and made it static, removed failed_start from set_extent_bit and have it
call __set_extent_bit with a NULL failed_start, and I've moved some code
down below the now static __set_extent_bit.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-io-tree.c

@@ -954,10 +954,10 @@ bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
  *
  * [start, end] is inclusive This takes the tree lock.
  */
-int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
-		   u32 bits, u64 *failed_start,
-		   struct extent_state **cached_state, gfp_t mask,
-		   struct extent_changeset *changeset)
+static int __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+			    u32 bits, u64 *failed_start,
+			    struct extent_state **cached_state,
+			    struct extent_changeset *changeset, gfp_t mask)
 {
 	struct extent_state *state;
 	struct extent_state *prealloc = NULL;
@@ -1169,6 +1169,14 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
 
 }
 
+int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+		   u32 bits, struct extent_state **cached_state, gfp_t mask,
+		   struct extent_changeset *changeset)
+{
+	return __set_extent_bit(tree, start, end, bits, NULL, cached_state,
+				changeset, mask);
+}
+
 /*
  * Convert all bits in a given range from one bit to another
  *
@@ -1605,8 +1613,8 @@ int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 	 */
 	ASSERT(!(bits & EXTENT_LOCKED));
 
-	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS,
-			      changeset);
+	return __set_extent_bit(tree, start, end, bits, NULL, NULL, changeset,
+				GFP_NOFS);
 }
 
 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
@@ -1627,8 +1635,8 @@ int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
 	int err;
 	u64 failed_start;
 
-	err = set_extent_bit(tree, start, end, EXTENT_LOCKED, &failed_start,
-			     NULL, GFP_NOFS, NULL);
+	err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, &failed_start,
+			       NULL, NULL, GFP_NOFS);
 	if (err == -EEXIST) {
 		if (failed_start > start)
 			clear_extent_bit(tree, start, failed_start - 1,
@@ -1649,9 +1657,9 @@ int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 	u64 failed_start;
 
 	while (1) {
-		err = set_extent_bit(tree, start, end, EXTENT_LOCKED,
-				     &failed_start, cached_state, GFP_NOFS,
-				     NULL);
+		err = __set_extent_bit(tree, start, end, EXTENT_LOCKED,
+				       &failed_start, cached_state, NULL,
+				       GFP_NOFS);
 		if (err == -EEXIST) {
 			wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED);
 			start = failed_start;

fs/btrfs/extent-io-tree.h

@@ -160,22 +160,19 @@ static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 			   u32 bits, struct extent_changeset *changeset);
 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
-		   u32 bits, u64 *failed_start,
-		   struct extent_state **cached_state, gfp_t mask,
+		   u32 bits, struct extent_state **cached_state, gfp_t mask,
 		   struct extent_changeset *changeset);
 
 static inline int set_extent_bits_nowait(struct extent_io_tree *tree, u64 start,
 					 u64 end, u32 bits)
 {
-	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOWAIT,
-			      NULL);
+	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOWAIT, NULL);
 }
 
 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
 		u64 end, u32 bits)
 {
-	return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS,
-			      NULL);
+	return set_extent_bit(tree, start, end, bits, NULL, GFP_NOFS, NULL);
 }
 
 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
@@ -188,8 +185,7 @@ static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
 		u64 end, gfp_t mask)
 {
-	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, NULL, mask,
-			      NULL);
+	return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, mask, NULL);
 }
 
 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
@@ -210,7 +206,7 @@ static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
 {
 	return set_extent_bit(tree, start, end,
 			      EXTENT_DELALLOC | extra_bits,
-			      NULL, cached_state, GFP_NOFS, NULL);
+			      cached_state, GFP_NOFS, NULL);
 }
 
 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
@@ -218,20 +214,20 @@ static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
 {
 	return set_extent_bit(tree, start, end,
 			      EXTENT_DELALLOC | EXTENT_DEFRAG,
-			      NULL, cached_state, GFP_NOFS, NULL);
+			      cached_state, GFP_NOFS, NULL);
 }
 
 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
 		u64 end)
 {
-	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
-			      GFP_NOFS, NULL);
+	return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, GFP_NOFS,
+			      NULL);
 }
 
 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
 		u64 end, struct extent_state **cached_state, gfp_t mask)
 {
-	return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
+	return set_extent_bit(tree, start, end, EXTENT_UPTODATE,
 			      cached_state, mask, NULL);
 }
 

fs/btrfs/inode.c

@@ -2815,7 +2815,7 @@ static int btrfs_find_new_delalloc_bytes(struct btrfs_inode *inode,
 
 		ret = set_extent_bit(&inode->io_tree, search_start,
 				     search_start + em_len - 1,
-				     EXTENT_DELALLOC_NEW, NULL, cached_state,
+				     EXTENT_DELALLOC_NEW, cached_state,
 				     GFP_NOFS, NULL);
 next:
 		search_start = extent_map_end(em);
@@ -4962,7 +4962,7 @@ int btrfs_truncate_block(struct btrfs_inode *inode, loff_t from, loff_t len,
 
 	if (only_release_metadata)
 		set_extent_bit(&inode->io_tree, block_start, block_end,
-			       EXTENT_NORESERVE, NULL, NULL, GFP_NOFS, NULL);
+			       EXTENT_NORESERVE, NULL, GFP_NOFS, NULL);
 
 out_unlock:
 	if (ret) {