This patch adds a new flag "reset_recalculate" that will restart
recalculating from the beginning of the device. It can be used if we want
to change the hash function. Example:
#!/bin/sh
dmsetup remove_all
rmmod brd
set -e
modprobe brd rd_size=1048576
dmsetup create in --table '0 2000000 integrity /dev/ram0 0 16 J 2 internal_hash:sha256 recalculate'
sleep 10
dmsetup status
dmsetup remove in
dmsetup create in --table '0 2000000 integrity /dev/ram0 0 16 J 2 internal_hash:sha3-256 reset_recalculate'
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c
+++ linux-2.6/drivers/md/dm-integrity.c
@@ -262,6 +262,7 @@ struct dm_integrity_c {
bool journal_uptodate;
bool just_formatted;
bool recalculate_flag;
+ bool reset_recalculate_flag;
bool discard;
bool fix_padding;
bool fix_hmac;
@@ -2526,7 +2527,8 @@ static void do_journal_write(struct dm_i
#ifndef INTERNAL_VERIFY
unlikely(from_replay) &&
#endif
- ic->internal_hash) {
+ ic->internal_hash &&
+ !ic->reset_recalculate_flag) {
char test_tag[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block),
@@ -3134,7 +3136,8 @@ static void dm_integrity_resume(struct d
rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
if (ic->mode == 'B') {
- if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
+ if (ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
+ !ic->reset_recalculate_flag) {
block_bitmap_copy(ic, ic->recalc_bitmap, ic->journal);
block_bitmap_copy(ic, ic->may_write_bitmap, ic->journal);
if (!block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors,
@@ -3156,7 +3159,8 @@ static void dm_integrity_resume(struct d
}
} else {
if (!(ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit &&
- block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR))) {
+ block_bitmap_op(ic, ic->journal, 0, ic->provided_data_sectors, BITMAP_OP_TEST_ALL_CLEAR)) ||
+ ic->reset_recalculate_flag) {
ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
ic->sb->recalc_sector = cpu_to_le64(0);
}
@@ -3169,6 +3173,10 @@ static void dm_integrity_resume(struct d
dm_integrity_io_error(ic, "writing superblock", r);
} else {
replay_journal(ic);
+ if (ic->reset_recalculate_flag) {
+ ic->sb->flags |= cpu_to_le32(SB_FLAG_RECALCULATING);
+ ic->sb->recalc_sector = cpu_to_le64(0);
+ }
if (ic->mode == 'B') {
ic->sb->flags |= cpu_to_le32(SB_FLAG_DIRTY_BITMAP);
ic->sb->log2_blocks_per_bitmap_bit = ic->log2_blocks_per_bitmap_bit;
@@ -3242,6 +3250,7 @@ static void dm_integrity_status(struct d
arg_count += !!ic->meta_dev;
arg_count += ic->sectors_per_block != 1;
arg_count += !!(ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING));
+ arg_count += ic->reset_recalculate_flag;
arg_count += ic->discard;
arg_count += ic->mode == 'J';
arg_count += ic->mode == 'J';
@@ -3261,6 +3270,8 @@ static void dm_integrity_status(struct d
DMEMIT(" block_size:%u", ic->sectors_per_block << SECTOR_SHIFT);
if (ic->sb->flags & cpu_to_le32(SB_FLAG_RECALCULATING))
DMEMIT(" recalculate");
+ if (ic->reset_recalculate_flag)
+ DMEMIT(" reset_recalculate");
if (ic->discard)
DMEMIT(" allow_discards");
DMEMIT(" journal_sectors:%u", ic->initial_sectors - SB_SECTORS);
@@ -3914,7 +3925,7 @@ static int dm_integrity_ctr(struct dm_ta
unsigned extra_args;
struct dm_arg_set as;
static const struct dm_arg _args[] = {
- {0, 17, "Invalid number of feature args"},
+ {0, 18, "Invalid number of feature args"},
};
unsigned journal_sectors, interleave_sectors, buffer_sectors, journal_watermark, sync_msec;
bool should_write_sb;
@@ -4058,6 +4069,9 @@ static int dm_integrity_ctr(struct dm_ta
goto bad;
} else if (!strcmp(opt_string, "recalculate")) {
ic->recalculate_flag = true;
+ } else if (!strcmp(opt_string, "reset_recalculate")) {
+ ic->recalculate_flag = true;
+ ic->reset_recalculate_flag = true;
} else if (!strcmp(opt_string, "allow_discards")) {
ic->discard = true;
} else if (!strcmp(opt_string, "fix_padding")) {
@@ -4554,7 +4568,7 @@ static void dm_integrity_dtr(struct dm_t
static struct target_type integrity_target = {
.name = "integrity",
- .version = {1, 7, 0},
+ .version = {1, 8, 0},
.module = THIS_MODULE,
.features = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
.ctr = dm_integrity_ctr,
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://listman.redhat.com/mailman/listinfo/dm-devel
