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Commit 00abf304 authored by Richard Weinberger's avatar Richard Weinberger Committed by Artem Bityutskiy
Browse files

UBI: Add self_check_eba() 



self_check_eba() compares two ubi_attach_info objects.
Fastmap uses this function for self checks.

Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
parent a7306653

drivers/mtd/ubi/eba.c

+96 −0
Original line number Diff line number Diff line
@@ -1201,6 +1201,102 @@ static void print_rsvd_warning(struct ubi_device *ubi, 
			 ubi->corr_peb_count);

}



/**

 * self_check_eba - run a self check on the EBA table constructed by fastmap.

 * @ubi: UBI device description object

 * @ai_fastmap: UBI attach info object created by fastmap

 * @ai_scan: UBI attach info object created by scanning

 *

 * Returns < 0 in case of an internal error, 0 otherwise.

 * If a bad EBA table entry was found it will be printed out and

 * ubi_assert() triggers.

 */

int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,

		   struct ubi_attach_info *ai_scan)

{

	int i, j, num_volumes, ret = 0;

	int **scan_eba, **fm_eba;

	struct ubi_ainf_volume *av;

	struct ubi_volume *vol;

	struct ubi_ainf_peb *aeb;

	struct rb_node *rb;



	num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;



	scan_eba = kmalloc(sizeof(*scan_eba) * num_volumes, GFP_KERNEL);

	if (!scan_eba)

		return -ENOMEM;



	fm_eba = kmalloc(sizeof(*fm_eba) * num_volumes, GFP_KERNEL);

	if (!fm_eba) {

		kfree(scan_eba);

		return -ENOMEM;

	}



	for (i = 0; i < num_volumes; i++) {

		vol = ubi->volumes[i];

		if (!vol)

			continue;



		scan_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**scan_eba),

				      GFP_KERNEL);

		if (!scan_eba[i]) {

			ret = -ENOMEM;

			goto out_free;

		}



		fm_eba[i] = kmalloc(vol->reserved_pebs * sizeof(**fm_eba),

				    GFP_KERNEL);

		if (!fm_eba[i]) {

			ret = -ENOMEM;

			goto out_free;

		}



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

			scan_eba[i][j] = fm_eba[i][j] = UBI_LEB_UNMAPPED;



		av = ubi_find_av(ai_scan, idx2vol_id(ubi, i));

		if (!av)

			continue;



		ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)

			scan_eba[i][aeb->lnum] = aeb->pnum;



		av = ubi_find_av(ai_fastmap, idx2vol_id(ubi, i));

		if (!av)

			continue;



		ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb)

			fm_eba[i][aeb->lnum] = aeb->pnum;



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

			if (scan_eba[i][j] != fm_eba[i][j]) {

				if (scan_eba[i][j] == UBI_LEB_UNMAPPED ||

					fm_eba[i][j] == UBI_LEB_UNMAPPED)

					continue;



				ubi_err("LEB:%i:%i is PEB:%i instead of %i!",

					vol->vol_id, i, fm_eba[i][j],

					scan_eba[i][j]);

				ubi_assert(0);

			}

		}

	}



out_free:

	for (i = 0; i < num_volumes; i++) {

		if (!ubi->volumes[i])

			continue;



		kfree(scan_eba[i]);

		kfree(fm_eba[i]);

	}



	kfree(scan_eba);

	kfree(fm_eba);

	return ret;

}



/**

 * ubi_eba_init - initialize the EBA sub-system using attaching information.

 * @ubi: UBI device description object