mtd: add a flags for partitions which should just leave smth. after them

Add support for MTDPART_OFS_RETAIN: such partitions start at the current
offset, take as much space as possible, but rain part->size bytes after
the end of the partitions for other parts. Primarily this is intended
for ts72xx arm platforms cleanup.

Artem: tweaked the patch a bit

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/mtd/partitions.h b/include/linux/mtd/partitions.h
index 08c9c7b8b8e2..1431cf2609ed 100644
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -24,7 +24,9 @@
  *      will extend to the end of the master MTD device.
  * offset: absolute starting position within the master MTD device; if
  *      defined as MTDPART_OFS_APPEND, the partition will start where the
- *      previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block.
+ *      previous one ended; if MTDPART_OFS_NXTBLK, at the next erase block;
+ *      if MTDPART_OFS_RETAIN, consume as much as possible, leaving size
+ *      after the end of partition.
  * mask_flags: contains flags that have to be masked (removed) from the
  *      master MTD flag set for the corresponding MTD partition.
  *      For example, to force a read-only partition, simply adding
@@ -42,6 +44,7 @@ struct mtd_partition {
         struct nand_ecclayout *ecclayout;       /* out of band layout for this partition (NAND only) */
 };
 
+#define MTDPART_OFS_RETAIN      (-3)
 #define MTDPART_OFS_NXTBLK      (-2)
 #define MTDPART_OFS_APPEND      (-1)
 #define MTDPART_SIZ_FULL        (0)