dm zoned: allocate temporary superblock for tertiary devices
Checking the tertiary superblock just consists of validating UUIDs, crcs, and the generation number; it doesn't have contents which would be required during the actual operation. So allocate a temporary superblock when checking tertiary devices to avoid having to store it together with the 'real' superblocks. Signed-off-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hannes Reinecke
Mike Snitzer
parent
a92fbc446d
commit
5d2c74f3dd
@ -174,7 +174,7 @@ struct dmz_metadata {
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/* Zone information array */
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struct xarray zones;
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struct dmz_sb sb[3];
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struct dmz_sb sb[2];
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unsigned int mblk_primary;
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unsigned int sb_version;
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u64 sb_gen;
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@ -1016,10 +1016,11 @@ err:
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/*
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* Check super block.
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*/
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static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
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static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
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bool tertiary)
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{
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struct dmz_super *sb = zmd->sb[set].sb;
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struct dmz_dev *dev = zmd->sb[set].dev;
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struct dmz_super *sb = dsb->sb;
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struct dmz_dev *dev = dsb->dev;
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unsigned int nr_meta_zones, nr_data_zones;
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u32 crc, stored_crc;
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u64 gen;
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@ -1036,7 +1037,7 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
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DMZ_META_VER, zmd->sb_version);
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return -EINVAL;
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}
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if ((zmd->sb_version < 1) && (set == 2)) {
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if (zmd->sb_version < 2 && tertiary) {
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dmz_dev_err(dev, "Tertiary superblocks are not supported");
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return -EINVAL;
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}
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@ -1080,7 +1081,7 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
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return -ENXIO;
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}
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if (set == 2) {
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if (tertiary) {
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/*
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* Generation number should be 0, but it doesn't
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* really matter if it isn't.
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@ -1129,14 +1130,13 @@ static int dmz_check_sb(struct dmz_metadata *zmd, unsigned int set)
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/*
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* Read the first or second super block from disk.
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*/
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static int dmz_read_sb(struct dmz_metadata *zmd, unsigned int set)
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static int dmz_read_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
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{
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dmz_zmd_debug(zmd, "read superblock set %d dev %s block %llu",
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set, zmd->sb[set].dev->name,
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zmd->sb[set].block);
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set, sb->dev->name, sb->block);
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return dmz_rdwr_block(zmd->sb[set].dev, REQ_OP_READ,
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zmd->sb[set].block, zmd->sb[set].mblk->page);
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return dmz_rdwr_block(sb->dev, REQ_OP_READ,
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sb->block, sb->mblk->page);
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}
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/*
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@ -1164,7 +1164,7 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
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zmd->sb[1].zone = dmz_get(zmd, zone_id + 1);
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zmd->sb[1].dev = zmd->sb[0].dev;
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for (i = 1; i < zmd->nr_rnd_zones; i++) {
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if (dmz_read_sb(zmd, 1) != 0)
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if (dmz_read_sb(zmd, &zmd->sb[1], 1) != 0)
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break;
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if (le32_to_cpu(zmd->sb[1].sb->magic) == DMZ_MAGIC)
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return 0;
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@ -1181,9 +1181,9 @@ static int dmz_lookup_secondary_sb(struct dmz_metadata *zmd)
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}
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/*
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* Read the first or second super block from disk.
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* Read a super block from disk.
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*/
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static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set)
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static int dmz_get_sb(struct dmz_metadata *zmd, struct dmz_sb *sb, int set)
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{
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struct dmz_mblock *mblk;
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int ret;
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@ -1193,14 +1193,14 @@ static int dmz_get_sb(struct dmz_metadata *zmd, unsigned int set)
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if (!mblk)
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return -ENOMEM;
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zmd->sb[set].mblk = mblk;
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zmd->sb[set].sb = mblk->data;
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sb->mblk = mblk;
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sb->sb = mblk->data;
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/* Read super block */
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ret = dmz_read_sb(zmd, set);
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ret = dmz_read_sb(zmd, sb, set);
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if (ret) {
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dmz_free_mblock(zmd, mblk);
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zmd->sb[set].mblk = NULL;
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sb->mblk = NULL;
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return ret;
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}
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@ -1274,13 +1274,13 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
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/* Read and check the primary super block */
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zmd->sb[0].block = dmz_start_block(zmd, zmd->sb[0].zone);
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zmd->sb[0].dev = dmz_zone_to_dev(zmd, zmd->sb[0].zone);
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ret = dmz_get_sb(zmd, 0);
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ret = dmz_get_sb(zmd, &zmd->sb[0], 0);
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if (ret) {
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dmz_dev_err(zmd->sb[0].dev, "Read primary super block failed");
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return ret;
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}
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ret = dmz_check_sb(zmd, 0);
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ret = dmz_check_sb(zmd, &zmd->sb[0], false);
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/* Read and check secondary super block */
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if (ret == 0) {
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@ -1293,7 +1293,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
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}
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zmd->sb[1].block = dmz_start_block(zmd, zmd->sb[1].zone);
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zmd->sb[1].dev = zmd->sb[0].dev;
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ret = dmz_get_sb(zmd, 1);
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ret = dmz_get_sb(zmd, &zmd->sb[1], 1);
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} else
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ret = dmz_lookup_secondary_sb(zmd);
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@ -1302,7 +1302,7 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
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return ret;
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}
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ret = dmz_check_sb(zmd, 1);
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ret = dmz_check_sb(zmd, &zmd->sb[1], false);
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if (ret == 0)
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sb_good[1] = true;
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@ -1347,20 +1347,40 @@ static int dmz_load_sb(struct dmz_metadata *zmd)
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"Using super block %u (gen %llu)",
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zmd->mblk_primary, zmd->sb_gen);
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if ((zmd->sb_version > 1) && zmd->sb[2].zone) {
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zmd->sb[2].block = dmz_start_block(zmd, zmd->sb[2].zone);
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zmd->sb[2].dev = dmz_zone_to_dev(zmd, zmd->sb[2].zone);
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ret = dmz_get_sb(zmd, 2);
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if (zmd->sb_version > 1) {
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int i;
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struct dmz_sb *sb;
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sb = kzalloc(sizeof(struct dmz_sb), GFP_KERNEL);
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if (!sb)
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return -ENOMEM;
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for (i = 1; i < zmd->nr_devs; i++) {
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sb->block = 0;
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sb->zone = dmz_get(zmd, zmd->dev[i].zone_offset);
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sb->dev = &zmd->dev[i];
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if (!dmz_is_meta(sb->zone)) {
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dmz_dev_err(sb->dev,
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"Tertiary super block zone %u not marked as metadata zone",
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sb->zone->id);
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ret = -EINVAL;
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goto out_kfree;
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}
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ret = dmz_get_sb(zmd, sb, i + 1);
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if (ret) {
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dmz_dev_err(zmd->sb[2].dev,
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dmz_dev_err(sb->dev,
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"Read tertiary super block failed");
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return ret;
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dmz_free_mblock(zmd, sb->mblk);
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goto out_kfree;
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}
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ret = dmz_check_sb(zmd, 2);
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ret = dmz_check_sb(zmd, sb, true);
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dmz_free_mblock(zmd, sb->mblk);
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if (ret == -EINVAL)
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return ret;
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goto out_kfree;
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}
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return 0;
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out_kfree:
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kfree(sb);
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}
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return ret;
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}
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/*
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@ -1417,12 +1437,15 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
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zmd->sb[0].zone = zone;
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}
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}
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if (zmd->nr_devs > 1 && !zmd->sb[2].zone) {
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/* Tertiary superblock zone */
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zmd->sb[2].zone = zone;
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if (zmd->nr_devs > 1 && num == 0) {
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/*
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* Tertiary superblock zones are always at the
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* start of the zoned devices, so mark them
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* as metadata zone.
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*/
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set_bit(DMZ_META, &zone->flags);
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}
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}
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return 0;
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}
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@ -2860,16 +2883,6 @@ int dmz_ctr_metadata(struct dmz_dev *dev, int num_dev,
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}
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set_bit(DMZ_META, &zone->flags);
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}
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if (zmd->sb[2].zone) {
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zone = dmz_get(zmd, zmd->sb[2].zone->id);
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if (!zone) {
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dmz_zmd_err(zmd,
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"Tertiary metadata zone not present");
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ret = -ENXIO;
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goto err;
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}
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set_bit(DMZ_META, &zone->flags);
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}
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/* Load mapping table */
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ret = dmz_load_mapping(zmd);
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if (ret)
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