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Commit 18cf4781 authored by Jan Kara's avatar Jan Kara
Browse files

udf: Unify common handling of descriptors 



When scanning Volume Descriptor Sequence, several descriptors have
exactly the same handling. Unify it.

Acked-by: default avatarPali Rohár <pali.rohar@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 4b8d4252

fs/udf/super.c

+19 −22
Original line number Diff line number Diff line
@@ -1593,6 +1593,21 @@ static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ 
	sbi->s_lvid_bh = NULL;

}



static struct udf_vds_record *get_volume_descriptor_record(

		struct udf_vds_record *vds, uint16_t ident)

{

	switch (ident) {

	case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */

		return &vds[VDS_POS_PRIMARY_VOL_DESC];

	case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */

		return &vds[VDS_POS_IMP_USE_VOL_DESC];

	case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */

		return &vds[VDS_POS_LOGICAL_VOL_DESC];

	case TAG_IDENT_USD: /* ISO 13346 3/10.8 */

		return &vds[VDS_POS_UNALLOC_SPACE_DESC];

	}

	return NULL;

}



/*

 * Process a main/reserve volume descriptor sequence.
@@ -1635,13 +1650,6 @@ static noinline int udf_process_sequence( 
		gd = (struct generic_desc *)bh->b_data;

		vdsn = le32_to_cpu(gd->volDescSeqNum);

		switch (ident) {

		case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */

			curr = &vds[VDS_POS_PRIMARY_VOL_DESC];

			if (vdsn >= curr->volDescSeqNum) {

				curr->volDescSeqNum = vdsn;

				curr->block = block;

			}

			break;

		case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */

			if (++indirections > UDF_MAX_TD_NESTING) {

				udf_err(sb, "too many Volume Descriptor "
@@ -1660,8 +1668,11 @@ static noinline int udf_process_sequence( 
			/* For loop is going to increment 'block' again */

			block--;

			break;

		case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */

		case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */

			curr = &vds[VDS_POS_IMP_USE_VOL_DESC];

		case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */

		case TAG_IDENT_USD: /* ISO 13346 3/10.8 */

			curr = get_volume_descriptor_record(vds, ident);

			if (vdsn >= curr->volDescSeqNum) {

				curr->volDescSeqNum = vdsn;

				curr->block = block;
@@ -1672,20 +1683,6 @@ static noinline int udf_process_sequence( 
			if (!curr->block)

				curr->block = block;

			break;

		case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */

			curr = &vds[VDS_POS_LOGICAL_VOL_DESC];

			if (vdsn >= curr->volDescSeqNum) {

				curr->volDescSeqNum = vdsn;

				curr->block = block;

			}

			break;

		case TAG_IDENT_USD: /* ISO 13346 3/10.8 */

			curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];

			if (vdsn >= curr->volDescSeqNum) {

				curr->volDescSeqNum = vdsn;

				curr->block = block;

			}

			break;

		case TAG_IDENT_TD: /* ISO 13346 3/10.9 */

			vds[VDS_POS_TERMINATING_DESC].block = block;

			done = true;