Keep track of xattr key & value references AFTER deduplication

This commit adds a reference count functionality to the string table
implementation and uses this functionality in the fstree code to
count how often each key and value is referenced by the deduplicated
Xattr blocks. This is needed to support deduplication through
out-of-band storage of xattrs.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 15 insertions, 2 deletions

diff --git a/lib/fstree/xattr.c b/lib/fstree/xattr.c
index 38f7703..4597d9d 100644
--- a/lib/fstree/xattr.c
+++ b/lib/fstree/xattr.c
@@ -102,11 +102,24 @@ static int cmp_u64(const void *lhs, const void *rhs)
 
 void fstree_xattr_reindex(fstree_t *fs)
 {
+	uint32_t key_idx, value_idx;
+	size_t i, index = 0;
 	tree_xattr_t *it;
-	size_t index = 0;
 
-	for (it = fs->xattr; it != NULL; it = it->next)
+	str_table_reset_ref_count(&fs->xattr_keys);
+	str_table_reset_ref_count(&fs->xattr_values);
+
+	for (it = fs->xattr; it != NULL; it = it->next) {
 		it->index = index++;
+
+		for (i = 0; i < it->num_attr; ++i) {
+			key_idx = (it->ref[i] >> 32) & 0x00000000FFFFFFFF;
+			value_idx = it->ref[i] & 0x00000000FFFFFFFF;
+
+			str_table_add_ref(&fs->xattr_keys, key_idx);
+			str_table_add_ref(&fs->xattr_values, value_idx);
+		}
+	}
 }
 
 void fstree_xattr_deduplicate(fstree_t *fs)