ext4: remove ext4_new_blocks() and call ext4_mb_new_blocks() directly

There was only one caller of the compatibility function
ext4_new_blocks(), in balloc.c's ext4_alloc_blocks().  Change it to
call ext4_mb_new_blocks() directly, and remove ext4_new_blocks()
altogether.  This cleans up the code, by removing two extra functions
from the call chain, and hopefully saving some stack usage.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

fs/ext4/balloc.c

@@ -741,26 +741,6 @@ ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
 	return ext4_new_meta_blocks(handle, inode, goal, &count, errp);
 }
 
-/*
- * ext4_new_blocks() -- allocate data blocks
- *
- * @handle:             handle to this transaction
- * @inode:              file inode
- * @goal:               given target block(filesystem wide)
- * @count:		total number of blocks need
- * @errp:               error code
- *
- * Return 1st allocated block numberon success, *count stores total account
- * error stores in errp pointer
- */
-
-ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
-				ext4_lblk_t iblock, ext4_fsblk_t goal,
-				unsigned long *count, int *errp)
-{
-	return do_blk_alloc(handle, inode, iblock, goal, count, errp, 0);
-}
-
 /**
  * ext4_count_free_blocks() -- count filesystem free blocks
  * @sb:		superblock

fs/ext4/ext4.h

@@ -1002,9 +1002,6 @@ extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
 			ext4_fsblk_t goal, int *errp);
 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
 			ext4_fsblk_t goal, unsigned long *count, int *errp);
-extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
-					ext4_lblk_t iblock, ext4_fsblk_t goal,
-					unsigned long *count, int *errp);
 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,

fs/ext4/inode.c

@@ -547,6 +547,7 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
 				int indirect_blks, int blks,
 				ext4_fsblk_t new_blocks[4], int *err)
 {
+	struct ext4_allocation_request ar;
 	int target, i;
 	unsigned long count = 0, blk_allocated = 0;
 	int index = 0;
@@ -595,10 +596,17 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
 	if (!target)
 		goto allocated;
 	/* Now allocate data blocks */
-	count = target;
-	/* allocating blocks for data blocks */
-	current_block = ext4_new_blocks(handle, inode, iblock,
-						goal, &count, err);
+	memset(&ar, 0, sizeof(ar));
+	ar.inode = inode;
+	ar.goal = goal;
+	ar.len = target;
+	ar.logical = iblock;
+	if (S_ISREG(inode->i_mode))
+		/* enable in-core preallocation only for regular files */
+		ar.flags = EXT4_MB_HINT_DATA;
+
+	current_block = ext4_mb_new_blocks(handle, &ar, err);
+
 	if (*err && (target == blks)) {
 		/*
 		 * if the allocation failed and we didn't allocate
@@ -614,7 +622,7 @@ static int ext4_alloc_blocks(handle_t *handle, struct inode *inode,
 		 */
 			new_blocks[index] = current_block;
 		}
-		blk_allocated += count;
+		blk_allocated += ar.len;
 	}
 allocated:
 	/* total number of blocks allocated for direct blocks */