[PATCH 07/13] libfrog: fix bitmap error communication problems

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Convert all the libfrog code and callers away from the libc-style
indirect errno returns to directly returning error codes to callers.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 libfrog/bitmap.c |   13 +++++++------
 libfrog/bitmap.h |    2 +-
 repair/rmap.c    |    4 ++--
 scrub/phase6.c   |   20 +++++++++++---------
 4 files changed, 21 insertions(+), 18 deletions(-)


diff --git a/libfrog/bitmap.c b/libfrog/bitmap.c
index 4dafc4c9..be95965f 100644
--- a/libfrog/bitmap.c
+++ b/libfrog/bitmap.c
@@ -23,7 +23,8 @@
  */
 
 #define avl_for_each_range_safe(pos, n, l, first, last) \
-	for (pos = (first), n = pos->avl_nextino, l = (last)->avl_nextino; pos != (l); \
+	for (pos = (first), n = pos->avl_nextino, l = (last)->avl_nextino; \
+			pos != (l); \
 			pos = n, n = pos ? pos->avl_nextino : NULL)
 
 #define avl_for_each_safe(tree, pos, n) \
@@ -67,18 +68,18 @@ static struct avl64ops bitmap_ops = {
 
 /* Initialize a bitmap. */
 int
-bitmap_init(
+bitmap_alloc(
 	struct bitmap		**bmapp)
 {
 	struct bitmap		*bmap;
 
 	bmap = calloc(1, sizeof(struct bitmap));
 	if (!bmap)
-		return -ENOMEM;
+		return errno;
 	bmap->bt_tree = malloc(sizeof(struct avl64tree_desc));
 	if (!bmap->bt_tree) {
 		free(bmap);
-		return -ENOMEM;
+		return errno;
 	}
 
 	pthread_mutex_init(&bmap->bt_lock, NULL);
@@ -139,12 +140,12 @@ __bitmap_insert(
 
 	ext = bitmap_node_init(start, length);
 	if (!ext)
-		return -ENOMEM;
+		return errno;
 
 	node = avl64_insert(bmap->bt_tree, &ext->btn_node);
 	if (node == NULL) {
 		free(ext);
-		return -EEXIST;
+		return EEXIST;
 	}
 
 	return 0;
diff --git a/libfrog/bitmap.h b/libfrog/bitmap.h
index 40119b9c..759386a8 100644
--- a/libfrog/bitmap.h
+++ b/libfrog/bitmap.h
@@ -11,7 +11,7 @@ struct bitmap {
 	struct avl64tree_desc	*bt_tree;
 };
 
-int bitmap_init(struct bitmap **bmap);
+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_iterate(struct bitmap *bmap, int (*fn)(uint64_t, uint64_t, void *),
diff --git a/repair/rmap.c b/repair/rmap.c
index b907383e..c6ed25a9 100644
--- a/repair/rmap.c
+++ b/repair/rmap.c
@@ -490,13 +490,13 @@ rmap_store_ag_btree_rec(
 	error = init_slab_cursor(ag_rmap->ar_raw_rmaps, rmap_compare, &rm_cur);
 	if (error)
 		goto err;
-	error = -bitmap_init(&own_ag_bitmap);
+	error = bitmap_alloc(&own_ag_bitmap);
 	if (error)
 		goto err_slab;
 	while ((rm_rec = pop_slab_cursor(rm_cur)) != NULL) {
 		if (rm_rec->rm_owner != XFS_RMAP_OWN_AG)
 			continue;
-		error = -bitmap_set(own_ag_bitmap, rm_rec->rm_startblock,
+		error = bitmap_set(own_ag_bitmap, rm_rec->rm_startblock,
 					rm_rec->rm_blockcount);
 		if (error) {
 			/*
diff --git a/scrub/phase6.c b/scrub/phase6.c
index aff04e76..d9285fee 100644
--- a/scrub/phase6.c
+++ b/scrub/phase6.c
@@ -341,6 +341,7 @@ xfs_check_rmap_ioerr(
 	struct media_verify_state	*vs = arg;
 	struct bitmap			*tree;
 	dev_t				dev;
+	int				ret;
 
 	dev = xfs_disk_to_dev(ctx, disk);
 
@@ -355,9 +356,9 @@ xfs_check_rmap_ioerr(
 	else
 		tree = NULL;
 	if (tree) {
-		errno = -bitmap_set(tree, start, length);
-		if (errno)
-			str_errno(ctx, ctx->mntpoint);
+		ret = bitmap_set(tree, start, length);
+		if (ret)
+			str_liberror(ctx, ret, _("setting bad block bitmap"));
 	}
 
 	snprintf(descr, DESCR_BUFSZ, _("dev %d:%d ioerr @ %"PRIu64":%"PRIu64" "),
@@ -454,16 +455,17 @@ xfs_scan_blocks(
 {
 	struct media_verify_state	vs = { NULL };
 	bool				moveon = false;
+	int				ret;
 
-	errno = -bitmap_init(&vs.d_bad);
-	if (errno) {
-		str_errno(ctx, ctx->mntpoint);
+	ret = bitmap_alloc(&vs.d_bad);
+	if (ret) {
+		str_liberror(ctx, ret, _("creating datadev badblock bitmap"));
 		goto out;
 	}
 
-	errno = -bitmap_init(&vs.r_bad);
-	if (errno) {
-		str_errno(ctx, ctx->mntpoint);
+	ret = bitmap_alloc(&vs.r_bad);
+	if (ret) {
+		str_liberror(ctx, ret, _("creating realtime badblock bitmap"));
 		goto out_dbad;
 	}