[12/51] libfrog: add bitmap_clear

Commit Message

Darrick J. Wong Dec. 23, 2024, 10:14 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Uncomment and fix bitmap_clear so that xfs_repair can start using it.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 libfrog/bitmap.c |   25 +++++++++++++++++++------
 libfrog/bitmap.h |    1 +
 2 files changed, 20 insertions(+), 6 deletions(-)

Patch

diff --git a/libfrog/bitmap.c b/libfrog/bitmap.c
index 5af5ab8dd6b3bb..0308886d446ff2 100644
--- a/libfrog/bitmap.c
+++ b/libfrog/bitmap.c
@@ -233,10 +233,9 @@  bitmap_set(
 	return res;
 }
 
-#if 0	/* Unused, provided for completeness. */
 /* Clear a region of bits. */
-int
-bitmap_clear(
+static int
+__bitmap_clear(
 	struct bitmap		*bmap,
 	uint64_t		start,
 	uint64_t		len)
@@ -251,8 +250,8 @@  bitmap_clear(
 	uint64_t		new_length;
 	struct avl64node	*node;
 	int			stat;
+	int			ret = 0;
 
-	pthread_mutex_lock(&bmap->bt_lock);
 	/* Find any existing nodes over that range. */
 	avl64_findranges(bmap->bt_tree, start, start + len, &firstn, &lastn);
 
@@ -312,10 +311,24 @@  bitmap_clear(
 	}
 
 out:
-	pthread_mutex_unlock(&bmap->bt_lock);
 	return ret;
 }
-#endif
+
+/* Clear a region of bits. */
+int
+bitmap_clear(
+	struct bitmap		*bmap,
+	uint64_t		start,
+	uint64_t		length)
+{
+	int			res;
+
+	pthread_mutex_lock(&bmap->bt_lock);
+	res = __bitmap_clear(bmap, start, length);
+	pthread_mutex_unlock(&bmap->bt_lock);
+
+	return res;
+}
 
 /* Iterate the set regions of this bitmap. */
 int
diff --git a/libfrog/bitmap.h b/libfrog/bitmap.h
index 043b77eece65b3..47df0ad38467ce 100644
--- a/libfrog/bitmap.h
+++ b/libfrog/bitmap.h
@@ -14,6 +14,7 @@  struct bitmap {
 int bitmap_alloc(struct bitmap **bmap);
 void bitmap_free(struct bitmap **bmap);
 int bitmap_set(struct bitmap *bmap, uint64_t start, uint64_t length);
+int bitmap_clear(struct bitmap *bmap, uint64_t start, uint64_t length);
 int bitmap_iterate(struct bitmap *bmap, int (*fn)(uint64_t, uint64_t, void *),
 		void *arg);
 int bitmap_iterate_range(struct bitmap *bmap, uint64_t start, uint64_t length,