udf: convert macros related to bitmaps to functions

convert UDF_SB_ALLOC_BITMAP macro to udf_sb_alloc_bitmap function
convert UDF_SB_FREE_BITMAP macro to udf_sb_free_bitmap function

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Fennema <bfennema@falcon.csc.calpoly.edu>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 55 insertions, 6 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 913ece8eec61..86aa2238bc7b 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -937,6 +937,39 @@ static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
 		  root->logicalBlockNum, root->partitionReferenceNum);
 }
 
+static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
+{
+	struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[index];
+	struct udf_bitmap *bitmap;
+	int nr_groups;
+	int size;
+
+	/* TODO: move calculating of nr_groups into helper function */
+	nr_groups = (map->s_partition_len +
+			(sizeof(struct spaceBitmapDesc) << 3) +
+			(sb->s_blocksize * 8) - 1) /
+			(sb->s_blocksize * 8);
+	size = sizeof(struct udf_bitmap) +
+		(sizeof(struct buffer_head *) * nr_groups);
+
+	if (size <= PAGE_SIZE)
+		bitmap = kmalloc(size, GFP_KERNEL);
+	else
+		bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
+
+	if (bitmap == NULL) {
+		udf_error(sb, __FUNCTION__,
+			  "Unable to allocate space for bitmap "
+			  "and %d buffer_head pointers", nr_groups);
+		return NULL;
+	}
+
+	memset(bitmap, 0x00, size);
+	bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
+	bitmap->s_nr_groups = nr_groups;
+	return bitmap;
+}
+
 static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 {
 	struct partitionDesc *p;
@@ -987,7 +1020,7 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 						  i, map->s_uspace.s_table->i_ino);
 				}
 				if (phd->unallocSpaceBitmap.extLength) {
-					UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
+					map->s_uspace.s_bitmap = udf_sb_alloc_bitmap(sb, i);
 					if (map->s_uspace.s_bitmap != NULL) {
 						map->s_uspace.s_bitmap->s_extLength =
 							le32_to_cpu(phd->unallocSpaceBitmap.extLength);
@@ -1017,7 +1050,7 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
 						  i, map->s_fspace.s_table->i_ino);
 				}
 				if (phd->freedSpaceBitmap.extLength) {
-					UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
+					map->s_fspace.s_bitmap = udf_sb_alloc_bitmap(sb, i);
 					if (map->s_fspace.s_bitmap != NULL) {
 						map->s_fspace.s_bitmap->s_extLength =
 							le32_to_cpu(phd->freedSpaceBitmap.extLength);
@@ -1504,6 +1537,22 @@ static void udf_close_lvid(struct super_block *sb)
 	}
 }
 
+static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
+{
+	int i;
+	int nr_groups = bitmap->s_nr_groups;
+	int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) * nr_groups);
+
+	for (i = 0; i < nr_groups; i++)
+		if (bitmap->s_block_bitmap[i])
+			brelse(bitmap->s_block_bitmap[i]);
+
+	if (size <= PAGE_SIZE)
+		kfree(bitmap);
+	else
+		vfree(bitmap);
+}
+
 /*
  * udf_read_super
  *
@@ -1689,9 +1738,9 @@ error_out:
 		if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 			iput(map->s_fspace.s_table);
 		if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
-			UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
+			udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 		if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
-			UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
+			udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 		if (map->s_partition_type == UDF_SPARABLE_MAP15)
 			for (i = 0; i < 4; i++)
 				brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
@@ -1767,9 +1816,9 @@ static void udf_put_super(struct super_block *sb)
 		if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
 			iput(map->s_fspace.s_table);
 		if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
-			UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_uspace);
+			udf_sb_free_bitmap(map->s_uspace.s_bitmap);
 		if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
-			UDF_SB_FREE_BITMAP(sb, sbi->s_partition, s_fspace);
+			udf_sb_free_bitmap(map->s_fspace.s_bitmap);
 		if (map->s_partition_type == UDF_SPARABLE_MAP15)
 			for (i = 0; i < 4; i++)
 				brelse(map->s_type_specific.s_sparing.s_spar_map[i]);