Commit 1a31368b authored by Dmitry Baryshkov's avatar Dmitry Baryshkov Committed by Artem Bityutskiy
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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: default avatarDmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent bf514081

drivers/mtd/mtdpart.c

+13 −0
Original line number Diff line number Diff line
@@ -479,6 +479,19 @@ static struct mtd_part *allocate_partition(struct mtd_info *master, 
			       (unsigned long long)cur_offset, (unsigned long long)slave->offset);

		}

	}

	if (slave->offset == MTDPART_OFS_RETAIN) {

		slave->offset = cur_offset;

		if (master->size - slave->offset >= slave->mtd.size) {

			slave->mtd.size = master->size - slave->offset

							- slave->mtd.size;

		} else {

			printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",

				part->name, master->size - slave->offset,

				slave->mtd.size);

			/* register to preserve ordering */

			goto out_register;

		}

	}

	if (slave->mtd.size == MTDPART_SIZ_FULL)

		slave->mtd.size = master->size - slave->offset;

include/linux/mtd/partitions.h

+4 −1
Original line number Diff line number Diff line
@@ -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)