dm integrity: allow resize of the integrity device

If the size of the underlying device changes, change the size of the
integrity device too.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index 90a9a5e62623ac04cd88419ebdb6ee87bd0187b5..fafd9ec1d56c504c41e07de5abaeec7b31789baf 100644 (file)
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -2833,9 +2833,29 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
 static void dm_integrity_resume(struct dm_target *ti)
 {
        struct dm_integrity_c *ic = (struct dm_integrity_c *)ti->private;
+       __u64 old_provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
        int r;
+
        DEBUG_print("resume\n");
 
+       if (ic->provided_data_sectors != old_provided_data_sectors) {
+               if (ic->provided_data_sectors > old_provided_data_sectors &&
+                   ic->mode == 'B' &&
+                   ic->sb->log2_blocks_per_bitmap_bit == ic->log2_blocks_per_bitmap_bit) {
+                       rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
+                                          ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
+                       block_bitmap_op(ic, ic->journal, old_provided_data_sectors,
+                                       ic->provided_data_sectors - old_provided_data_sectors, BITMAP_OP_SET);
+                       rw_journal_sectors(ic, REQ_OP_WRITE, REQ_FUA | REQ_SYNC, 0,
+                                          ic->n_bitmap_blocks * (BITMAP_BLOCK_SIZE >> SECTOR_SHIFT), NULL);
+               }
+
+               ic->sb->provided_data_sectors = cpu_to_le64(ic->provided_data_sectors);
+               r = sync_rw_sb(ic, REQ_OP_WRITE, REQ_FUA);
+               if (unlikely(r))
+                       dm_integrity_io_error(ic, "writing superblock", r);
+       }
+
        if (ic->sb->flags & cpu_to_le32(SB_FLAG_DIRTY_BITMAP)) {
                DEBUG_print("resume dirty_bitmap\n");
                rw_journal_sectors(ic, REQ_OP_READ, 0, 0,
@@ -3938,16 +3958,16 @@ static int dm_integrity_ctr(struct dm_target *ti, unsigned argc, char **argv)
                        goto bad;
                }
        }
-       ic->provided_data_sectors = le64_to_cpu(ic->sb->provided_data_sectors);
-       if (ic->provided_data_sectors != le64_to_cpu(ic->sb->provided_data_sectors)) {
-               /* test for overflow */
+       if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
                r = -EINVAL;
-               ti->error = "The superblock has 64-bit device size, but the kernel was compiled with 32-bit sectors";
+               ti->error = "Journal mac mismatch";
                goto bad;
        }
-       if (!!(ic->sb->flags & cpu_to_le32(SB_FLAG_HAVE_JOURNAL_MAC)) != !!ic->journal_mac_alg.alg_string) {
+
+       get_provided_data_sectors(ic);
+       if (!ic->provided_data_sectors) {
                r = -EINVAL;
-               ti->error = "Journal mac mismatch";
+               ti->error = "The device is too small";
                goto bad;
        }
 
@@ -4219,7 +4239,7 @@ static void dm_integrity_dtr(struct dm_target *ti)
 
 static struct target_type integrity_target = {
        .name                   = "integrity",
-       .version                = {1, 5, 0},
+       .version                = {1, 6, 0},
        .module                 = THIS_MODULE,
        .features               = DM_TARGET_SINGLETON | DM_TARGET_INTEGRITY,
        .ctr                    = dm_integrity_ctr,