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- * Return the next offset in a block map.
+ * blkmap_next_off - Return next logical block offset in a block map.
+ * @blkmap: blockmap to use
+ * @o: current file logical block number
+ * @t: current extent index into blockmap (in/out)
+ * Given a logical block offset in a file, return the next mapped logical offset
+ * The map index "t" tracks the current extent number in the block map, and
+ * is updated automatically if the returned offset resides within the next
+ * mapped extent.
+ * If the blockmap contains no extents, or no more logical offsets are mapped,
+ * or the extent index exceeds the number of extents in the map,
+ * return NULLDFILOFF.
+ * If offset o is beyond extent index t, the first offset in the next extent
+ * after extent t will be returned.
+ * Intended to be called starting with offset 0, index 0, and iterated.
@@ -223,10 +240,12 @@ blkmap_next_off(
*t = 0;
+ if (*t >= blkmap->nexts)
+ return NULLDFILOFF;
ext = blkmap->exts + *t;
if (o < ext->startoff + ext->blockcount - 1)
return o + 1;
- if (*t >= blkmap->nexts - 1)
+ if (*t == blkmap->nexts - 1)