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udf: Unify common handling of descriptors 

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

Acked-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2018-02-09 15:15:39 +01:00
parent 4b8d425215
commit 18cf4781c9
1 changed files with 19 additions and 22 deletions
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41
fs/udf/super.c
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@ -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;