Commit aab616e3 authored by Boris Brezillon's avatar Boris Brezillon
Browse files

mtd: kill the nand_ecclayout struct 



Now that all MTD drivers have moved to the mtd_ooblayout_ops model we can
safely remove the struct nand_ecclayout definition, and all the remaining
places where it was still used.

Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 7f2b092c

drivers/mtd/mtdchar.c

+6 −6
Original line number Diff line number Diff line
@@ -465,12 +465,12 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, 
}



/*

 * Copies (and truncates, if necessary) data from the larger struct,

 * nand_ecclayout, to the smaller, deprecated layout struct,

 * nand_ecclayout_user. This is necessary only to support the deprecated

 * API ioctl ECCGETLAYOUT while allowing all new functionality to use

 * nand_ecclayout flexibly (i.e. the struct may change size in new

 * releases without requiring major rewrites).

 * Copies (and truncates, if necessary) OOB layout information to the

 * deprecated layout struct, nand_ecclayout_user. This is necessary only to

 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new

 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops

 * can describe any kind of OOB layout with almost zero overhead from a

 * memory usage point of view).

 */

static int shrink_ecclayout(struct mtd_info *mtd,

			    struct nand_ecclayout_user *to)

drivers/mtd/mtdcore.c

+0 −117
Original line number Diff line number Diff line
@@ -1376,123 +1376,6 @@ int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd) 
}

EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);



/**

 * mtd_ecclayout_ecc - Default ooblayout_ecc iterator implementation

 * @mtd: MTD device structure

 * @section: ECC section. Depending on the layout you may have all the ECC

 *	     bytes stored in a single contiguous section, or one section

 *	     per ECC chunk (and sometime several sections for a single ECC

 *	     ECC chunk)

 * @oobecc: OOB region struct filled with the appropriate ECC position

 *	    information

 *

 * This function is just a wrapper around the mtd->ecclayout field and is

 * here to ease the transition to the mtd_ooblayout_ops approach.

 * All it does is convert the layout->eccpos information into proper oob

 * region definitions.

 *

 * Returns zero on success, a negative error code otherwise.

 */

static int mtd_ecclayout_ecc(struct mtd_info *mtd, int section,

			     struct mtd_oob_region *oobecc)

{

	int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;



	if (!mtd->ecclayout)

		return -ENOTSUPP;



	/*

	 * This logic allows us to reuse the ->ecclayout information and

	 * expose them as ECC regions (as done for the OOB free regions).

	 *

	 * TODO: this should be dropped as soon as we get rid of the

	 * ->ecclayout field.

	 */

	for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {

		eccpos = mtd->ecclayout->eccpos[eccbyte];



		if (eccbyte < mtd->ecclayout->eccbytes - 1) {

			int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];



			if (eccpos + 1 == neccpos) {

				length++;

				continue;

			}

		}



		if (section == cursection)

			break;



		length = 0;

		cursection++;

	}



	if (cursection != section || eccbyte >= mtd->ecclayout->eccbytes)

		return -ERANGE;



	oobecc->length = length + 1;

	oobecc->offset = eccpos - length;



	return 0;

}



/**

 * mtd_ecclayout_ecc - Default ooblayout_free iterator implementation

 * @mtd: MTD device structure

 * @section: Free section. Depending on the layout you may have all the free

 *	     bytes stored in a single contiguous section, or one section

 *	     per ECC chunk (and sometime several sections for a single ECC

 *	     ECC chunk)

 * @oobfree: OOB region struct filled with the appropriate free position

 *	     information

 *

 * This function is just a wrapper around the mtd->ecclayout field and is

 * here to ease the transition to the mtd_ooblayout_ops approach.

 * All it does is convert the layout->oobfree information into proper oob

 * region definitions.

 *

 * Returns zero on success, a negative error code otherwise.

 */

static int mtd_ecclayout_free(struct mtd_info *mtd, int section,

			      struct mtd_oob_region *oobfree)

{

	struct nand_ecclayout *layout = mtd->ecclayout;



	if (!layout)

		return -ENOTSUPP;



	if (section >= MTD_MAX_OOBFREE_ENTRIES_LARGE ||

	    !layout->oobfree[section].length)

		return -ERANGE;



	oobfree->offset = layout->oobfree[section].offset;

	oobfree->length = layout->oobfree[section].length;



	return 0;

}



static const struct mtd_ooblayout_ops mtd_ecclayout_wrapper_ops = {

	.ecc = mtd_ecclayout_ecc,

	.free = mtd_ecclayout_free,

};



/**

 * mtd_set_ecclayout - Attach an ecclayout to an MTD device

 * @mtd: MTD device structure

 * @ecclayout: The ecclayout to attach to the device

 *

 * Returns zero on success, a negative error code otherwise.

 */

void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout)

{

	if (!mtd || !ecclayout)

		return;



	mtd->ecclayout = ecclayout;

	mtd_set_ooblayout(mtd, &mtd_ecclayout_wrapper_ops);

}

EXPORT_SYMBOL_GPL(mtd_set_ecclayout);



/*

 * Method to access the protection register area, present in some flash

 * devices. The user data is one time programmable but the factory data is read

include/linux/mtd/mtd.h

+0 −20
Original line number Diff line number Diff line
@@ -96,21 +96,6 @@ struct mtd_oob_ops { 


#define MTD_MAX_OOBFREE_ENTRIES_LARGE	32

#define MTD_MAX_ECCPOS_ENTRIES_LARGE	640

/*

 * Internal ECC layout control structure. For historical reasons, there is a

 * similar, smaller struct nand_ecclayout_user (in mtd-abi.h) that is retained

 * for export to user-space via the ECCGETLAYOUT ioctl.

 * nand_ecclayout should be expandable in the future simply by the above macros.

 *

 * This structure is now deprecated, you should use struct nand_ecclayout_ops

 * to describe your OOB layout.

 */

struct nand_ecclayout {

	__u32 eccbytes;

	__u32 eccpos[MTD_MAX_ECCPOS_ENTRIES_LARGE];

	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];

};



/**

 * struct mtd_oob_region - oob region definition

 * @offset: region offset
@@ -200,9 +185,6 @@ struct mtd_info { 
	const char *name;

	int index;



	/* [Deprecated] ECC layout structure pointer - read only! */

	struct nand_ecclayout *ecclayout;



	/* OOB layout description */

	const struct mtd_ooblayout_ops *ooblayout;
@@ -308,8 +290,6 @@ int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf, 
int mtd_ooblayout_count_freebytes(struct mtd_info *mtd);

int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd);



void mtd_set_ecclayout(struct mtd_info *mtd, struct nand_ecclayout *ecclayout);



static inline void mtd_set_ooblayout(struct mtd_info *mtd,

				     const struct mtd_ooblayout_ops *ooblayout)

{

include/uapi/mtd/mtd-abi.h

+1 −1
Original line number Diff line number Diff line
@@ -228,7 +228,7 @@ struct nand_oobfree { 
 * complete set of ECC information. The ioctl truncates the larger internal

 * structure to retain binary compatibility with the static declaration of the

 * ioctl. Note that the "MTD_MAX_..._ENTRIES" macros represent the max size of

 * the user struct, not the MAX size of the internal struct nand_ecclayout.

 * the user struct, not the MAX size of the internal OOB layout representation.

 */

struct nand_ecclayout_user {

	__u32 eccbytes;

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