File btrfs-progs-convert-introduce-simple-range-structure-for-convert-reserved-ranges.patch of Package btrfsprogs.11414

From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Subject: btrfs-progs: convert: Introduce simple range structure for convert
 reserved ranges
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git
Git-commit: 714cda6136b90b3159bed9f077ede9608fbca49f
Patch-mainline: v4.10.1

Introduce a new strucutre, simple_range, to present one contingous
range.

Also, use such structure to define btrfs_reserved_ranges(), which
convert and rollback will use.

Suggested-by: David Sterba <dsterba@suse.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[ split hunks to new file structure ]
Signed-off-by: David Sterba <dsterba@suse.com>
Acked-by: Jeff Mahoney <jeffm@suse.com>
---
 convert/source-fs.c |  6 ++++++
 convert/source-fs.h | 23 +++++++++++++++++++++++
 2 files changed, 29 insertions(+)

--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -56,6 +56,29 @@
 #define EXT2FS_B2C(fs, blk)		(blk)
 #endif
 
+/*
+ * Reresents a simple contiguous range.
+ *
+ * For multiple or non-contiguous ranges, use extent_cache_tree from
+ * extent-cache.c
+ */
+struct simple_range {
+	u64 start;
+	u64 len;
+};
+
+/*
+ * Simple range functions
+ *
+ * Get range end (exclusive)
+ */
+static inline u64 range_end(struct simple_range *range)
+{
+	return (range->start + range->len);
+}
+
+extern struct simple_range btrfs_reserved_ranges[3];
+
 struct task_ctx {
 	uint32_t max_copy_inodes;
 	uint32_t cur_copy_inodes;
@@ -377,6 +400,12 @@ fail:
 	return -ENOSPC;
 }
 
+struct simple_range btrfs_reserved_ranges[3] = {
+	{ 0,			     SZ_1M },
+	{ BTRFS_SB_MIRROR_OFFSET(1), SZ_64K },
+	{ BTRFS_SB_MIRROR_OFFSET(2), SZ_64K }
+};
+
 static int intersect_with_sb(u64 bytenr, u64 num_bytes)
 {
 	int i;