DO NOT MERGE
Adding a basic merge implementation of bitarray for later
adding/supporting test cases w.r.t. libext2fs merge/clone API.
Signed-off-by: Ritesh Harjani <ritesh.list@xxxxxxxxx>
---
lib/ext2fs/blkmap64_ba.c | 53 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 52 insertions(+), 1 deletion(-)
diff --git a/lib/ext2fs/blkmap64_ba.c b/lib/ext2fs/blkmap64_ba.c
index 4e7007f0..9a9f6563 100644
--- a/lib/ext2fs/blkmap64_ba.c
+++ b/lib/ext2fs/blkmap64_ba.c
@@ -12,6 +12,7 @@
#include "config.h"
#include <stdio.h>
#include <string.h>
+#include <assert.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
@@ -476,6 +477,55 @@ static errcode_t ba_find_first_set(ext2fs_generic_bitmap_64 bitmap,
return ENOENT;
}
+errcode_t ba_merge_bmap(ext2fs_generic_bitmap_64 src,
+ ext2fs_generic_bitmap_64 dst,
+ ext2fs_generic_bitmap_64 dup,
+ ext2fs_generic_bitmap_64 dup_allowed)
+{
+ ext2fs_ba_private src_bp = (ext2fs_ba_private) src->private;
+ ext2fs_ba_private dst_bp = (ext2fs_ba_private) dst->private;
+
+ const unsigned char *src_pos = src_bp->bitarray;
+ const unsigned char *dst_pos = dst_bp->bitarray;
+ unsigned long count = src->real_end - src->start + 1;
+ unsigned long bitpos = src->start;
+
+ assert(src->start == dst->start);
+ assert(src->end == dst->end);
+ assert(src->real_end == dst->real_end);
+
+ // TODO add full support
+ // For now assuming the pos is aligned addr
+ assert(!(((uintptr_t)src_pos) & 0x07));
+
+ // 8-byte blocks compare
+ while (count >= 64) {
+ const __u64 src_val = *(const __u64 *)src_pos;
+ const __u64 dst_val = *(const __u64 *)dst_pos;
+ const __u64 sd_val = src_val & dst_val;
+
+ // TODO: Not implemented case to handle duplicates/dup_allowed case of EA
+ if (dup || dup_allowed)
+ assert(sd_val == 0);
+
+ *(__u64 *)dst_pos |= src_val;
+
+ src_pos += 8;
+ dst_pos += 8;
+ count -= 64;
+ bitpos += 64;
+ }
+
+ while (count-- > 0) {
+ // TODO: dup case not implemented yet.
+ if (ext2fs_test_bit64(bitpos, src_bp->bitarray))
+ assert(ext2fs_set_bit64(bitpos, dst_bp->bitarray) == 0);
+ bitpos++;
+ }
+
+ return 0;
+}
+
struct ext2_bitmap_ops ext2fs_blkmap64_bitarray = {
.type = EXT2FS_BMAP64_BITARRAY,
@@ -494,5 +544,6 @@ struct ext2_bitmap_ops ext2fs_blkmap64_bitarray = {
.clear_bmap = ba_clear_bmap,
.print_stats = ba_print_stats,
.find_first_zero = ba_find_first_zero,
- .find_first_set = ba_find_first_set
+ .find_first_set = ba_find_first_set,
+ .merge_bmap = ba_merge_bmap,
};
--
2.35.3
