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Commit 1f81a5cc authored by Boris Brezillon's avatar Boris Brezillon Committed by Richard Weinberger
Browse files

UBI: provide an helper to query LEB information 



This is part of our attempt to hide EBA internals from other part of the
implementation in order to easily adapt it to the MLC needs.

Here we are creating an ubi_eba_leb_desc struct to hide the way we keep
track of the LEB to PEB mapping.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 75547696

drivers/mtd/ubi/eba.c

+17 −0
Original line number Diff line number Diff line
@@ -83,6 +83,23 @@ static int ubi_get_compat(const struct ubi_device *ubi, int vol_id) 
	return 0;

}



/**

 * ubi_eba_get_ldesc - get information about a LEB

 * @vol: volume description object

 * @lnum: logical eraseblock number

 * @ldesc: the LEB descriptor to fill

 *

 * Used to query information about a specific LEB.

 * It is currently only returning the physical position of the LEB, but will be

 * extended to provide more information.

 */

void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,

		       struct ubi_eba_leb_desc *ldesc)

{

	ldesc->lnum = lnum;

	ldesc->pnum = vol->eba_tbl[lnum];

}



/**

 * ltree_lookup - look up the lock tree.

 * @ubi: UBI device description object

drivers/mtd/ubi/fastmap.c

+6 −2
Original line number Diff line number Diff line
@@ -1257,8 +1257,12 @@ static int ubi_write_fastmap(struct ubi_device *ubi, 
		fm_pos += sizeof(*feba) + (sizeof(__be32) * vol->reserved_pebs);

		ubi_assert(fm_pos <= ubi->fm_size);



		for (j = 0; j < vol->reserved_pebs; j++)

			feba->pnum[j] = cpu_to_be32(vol->eba_tbl[j]);

		for (j = 0; j < vol->reserved_pebs; j++) {

			struct ubi_eba_leb_desc ldesc;



			ubi_eba_get_ldesc(vol, j, &ldesc);

			feba->pnum[j] = cpu_to_be32(ldesc.pnum);

		}



		feba->reserved_pebs = cpu_to_be32(j);

		feba->magic = cpu_to_be32(UBI_FM_EBA_MAGIC);

drivers/mtd/ubi/ubi.h

+17 −0
Original line number Diff line number Diff line
@@ -266,6 +266,21 @@ struct ubi_fm_pool { 
	int max_size;

};



/**

 * struct ubi_eba_leb_desc - EBA logical eraseblock descriptor

 * @lnum: the logical eraseblock number

 * @pnum: the physical eraseblock where the LEB can be found

 *

 * This structure is here to hide EBA's internal from other part of the

 * UBI implementation.

 *

 * One can query the position of a LEB by calling ubi_eba_get_ldesc().

 */

struct ubi_eba_leb_desc {

	int lnum;

	int pnum;

};



/**

 * struct ubi_volume - UBI volume description data structure.

 * @dev: device object to make use of the the Linux device model
@@ -849,6 +864,8 @@ static inline bool ubi_leb_valid(struct ubi_volume *vol, int lnum) 
}



/* eba.c */

void ubi_eba_get_ldesc(struct ubi_volume *vol, int lnum,

		       struct ubi_eba_leb_desc *ldesc);

bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum);

int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,

		      int lnum);