From: Li Nan <linan122@xxxxxxxxxx>
Factor out try_adjacent_combine(), and it will be used in the later patch.
Signed-off-by: Li Nan <linan122@xxxxxxxxxx>
Reviewed-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/badblocks.c | 40 ++++++++++++++++++++++++++--------------
1 file changed, 26 insertions(+), 14 deletions(-)
diff --git a/block/badblocks.c b/block/badblocks.c
index bcee057efc47..f069c93e986d 100644
--- a/block/badblocks.c
+++ b/block/badblocks.c
@@ -855,6 +855,31 @@ static void badblocks_update_acked(struct badblocks *bb)
bb->unacked_exist = 0;
}
+/*
+ * Return 'true' if the range indicated by 'bad' is exactly backward
+ * overlapped with the bad range (from bad table) indexed by 'behind'.
+ */
+static bool try_adjacent_combine(struct badblocks *bb, int prev)
+{
+ u64 *p = bb->page;
+
+ if (prev >= 0 && (prev + 1) < bb->count &&
+ BB_END(p[prev]) == BB_OFFSET(p[prev + 1]) &&
+ (BB_LEN(p[prev]) + BB_LEN(p[prev + 1])) <= BB_MAX_LEN &&
+ BB_ACK(p[prev]) == BB_ACK(p[prev + 1])) {
+ p[prev] = BB_MAKE(BB_OFFSET(p[prev]),
+ BB_LEN(p[prev]) + BB_LEN(p[prev + 1]),
+ BB_ACK(p[prev]));
+
+ if ((prev + 2) < bb->count)
+ memmove(p + prev + 1, p + prev + 2,
+ (bb->count - (prev + 2)) * 8);
+ bb->count--;
+ return true;
+ }
+ return false;
+}
+
/* Do exact work to set bad block range into the bad block table */
static int _badblocks_set(struct badblocks *bb, sector_t s, int sectors,
int acknowledged)
@@ -1022,20 +1047,7 @@ static int _badblocks_set(struct badblocks *bb, sector_t s, int sectors,
* merged. (prev < 0) condition is not handled here,
* because it's already complicated enough.
*/
- if (prev >= 0 &&
- (prev + 1) < bb->count &&
- BB_END(p[prev]) == BB_OFFSET(p[prev + 1]) &&
- (BB_LEN(p[prev]) + BB_LEN(p[prev + 1])) <= BB_MAX_LEN &&
- BB_ACK(p[prev]) == BB_ACK(p[prev + 1])) {
- p[prev] = BB_MAKE(BB_OFFSET(p[prev]),
- BB_LEN(p[prev]) + BB_LEN(p[prev + 1]),
- BB_ACK(p[prev]));
-
- if ((prev + 2) < bb->count)
- memmove(p + prev + 1, p + prev + 2,
- (bb->count - (prev + 2)) * 8);
- bb->count--;
- }
+ try_adjacent_combine(bb, prev);
if (space_desired && !badblocks_full(bb)) {
s = orig_start;
--
2.39.2
