[PATCH 040/119] xfs: create helpers for mapping, unmapping, and converting file fork extents

Darrick J. Wong
2016-06-17T01:22:16Z

Create two helper functions to assist with mapping, unmapping, and
converting flag status of extents in a file's data/attr forks. For
non-shared files we can use the _alloc, _free, and _convert functions;
when reflink comes these functions will be augmented to deal with
shared extents.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/libxfs/xfs_rmap.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c
index f92eaa1..76fc5c2 100644
--- a/fs/xfs/libxfs/xfs_rmap.c
+++ b/fs/xfs/libxfs/xfs_rmap.c
@@ -1123,11 +1123,53 @@ done:
return error;
}

+/*
+ * Convert an unwritten extent to a real extent or vice versa.
+ */
+STATIC int
+xfs_rmap_convert(
+ struct xfs_btree_cur *cur,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ bool unwritten,
+ struct xfs_owner_info *oinfo)
+{
+ return __xfs_rmap_convert(cur, bno, len, unwritten, oinfo);
+}
+
#undef NEW
#undef LEFT
#undef RIGHT
#undef PREV

+/*
+ * Find an extent in the rmap btree and unmap it.
+ */
+STATIC int
+xfs_rmap_unmap(
+ struct xfs_btree_cur *cur,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ bool unwritten,
+ struct xfs_owner_info *oinfo)
+{
+ return __xfs_rmap_free(cur, bno, len, unwritten, oinfo);
+}
+
+/*
+ * Find an extent in the rmap btree and map it.
+ */
+STATIC int
+xfs_rmap_map(
+ struct xfs_btree_cur *cur,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ bool unwritten,
+ struct xfs_owner_info *oinfo)
+{
+ return __xfs_rmap_alloc(cur, bno, len, unwritten, oinfo);
+}
+
struct xfs_rmapbt_query_range_info {
xfs_rmapbt_query_range_fn fn;
void *priv;