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Btrfs: Add support for duplicate blocks on a single spindle
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
parent
8790d502e4
commit
611f0e00a2
4 changed files with 37 additions and 9 deletions
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@ -419,6 +419,7 @@ struct btrfs_csum_item {
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#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
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#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
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#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
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#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
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struct btrfs_block_group_item {
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@ -913,9 +913,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
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fs_info->generation = btrfs_super_generation(disk_super) + 1;
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if (btrfs_super_num_devices(disk_super) > 0) {
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fs_info->data_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
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fs_info->metadata_alloc_profile = BTRFS_BLOCK_GROUP_RAID1;
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fs_info->system_alloc_profile = BTRFS_BLOCK_GROUP_RAID0;
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fs_info->data_alloc_profile = BTRFS_BLOCK_GROUP_RAID0 |
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BTRFS_BLOCK_GROUP_RAID1;
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fs_info->metadata_alloc_profile = BTRFS_BLOCK_GROUP_RAID1 |
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BTRFS_BLOCK_GROUP_DUP;
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fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
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}
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mutex_unlock(&fs_info->fs_mutex);
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return tree_root;
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@ -231,7 +231,7 @@ static int noinline find_search_start(struct btrfs_root *root,
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if (start + num > total_fs_bytes)
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goto new_group;
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if (!block_group_bits(cache, data)) {
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printk("block group bits don't match %Lu %Lu\n", cache->flags, data);
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printk("block group bits don't match %Lu %d\n", cache->flags, data);
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}
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*start_ret = start;
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return 0;
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@ -1048,7 +1048,8 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
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static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
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{
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u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
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BTRFS_BLOCK_GROUP_RAID1);
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BTRFS_BLOCK_GROUP_RAID1 |
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BTRFS_BLOCK_GROUP_DUP);
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if (extra_flags) {
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if (flags & BTRFS_BLOCK_GROUP_DATA)
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fs_info->avail_data_alloc_bits |= extra_flags;
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@ -627,6 +627,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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struct extent_map *em;
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u64 physical;
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u64 calc_size = 1024 * 1024 * 1024;
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u64 min_free = calc_size;
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u64 avail;
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u64 max_avail = 0;
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int num_stripes = 1;
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@ -641,6 +642,8 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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if (type & (BTRFS_BLOCK_GROUP_RAID0))
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num_stripes = btrfs_super_num_devices(&info->super_copy);
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if (type & (BTRFS_BLOCK_GROUP_DUP))
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num_stripes = 2;
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if (type & (BTRFS_BLOCK_GROUP_RAID1)) {
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num_stripes = min_t(u64, 2,
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btrfs_super_num_devices(&info->super_copy));
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@ -649,16 +652,23 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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INIT_LIST_HEAD(&private_devs);
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cur = dev_list->next;
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index = 0;
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if (type & BTRFS_BLOCK_GROUP_DUP)
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min_free = calc_size * 2;
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/* build a private list of devices we will allocate from */
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while(index < num_stripes) {
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device = list_entry(cur, struct btrfs_device, dev_list);
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avail = device->total_bytes - device->bytes_used;
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cur = cur->next;
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if (avail > max_avail)
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max_avail = avail;
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if (avail >= calc_size) {
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if (avail >= min_free) {
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list_move_tail(&device->dev_list, &private_devs);
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index++;
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if (type & BTRFS_BLOCK_GROUP_DUP)
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index++;
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}
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if (cur == dev_list)
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break;
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@ -689,16 +699,21 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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stripes = &chunk->stripe;
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if (type & BTRFS_BLOCK_GROUP_RAID1)
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if (type & (BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_DUP))
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*num_bytes = calc_size;
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else
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*num_bytes = calc_size * num_stripes;
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index = 0;
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printk("new chunk type %Lu start %Lu size %Lu\n", type, key.objectid, *num_bytes);
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while(index < num_stripes) {
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BUG_ON(list_empty(&private_devs));
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cur = private_devs.next;
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device = list_entry(cur, struct btrfs_device, dev_list);
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/* loop over this device again if we're doing a dup group */
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if (!(type & BTRFS_BLOCK_GROUP_DUP) ||
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(index == num_stripes - 1))
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list_move_tail(&device->dev_list, dev_list);
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ret = btrfs_alloc_dev_extent(trans, device,
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@ -839,6 +854,14 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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}
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*total_devs = 1;
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}
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} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
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if (rw == WRITE) {
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*total_devs = map->num_stripes;
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stripe_index = dev_nr;
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} else {
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stripe_index = 0;
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*total_devs = 1;
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}
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} else {
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/*
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* after this do_div call, stripe_nr is the number of stripes
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@ -851,7 +874,8 @@ int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
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*phys = map->stripes[stripe_index].physical + stripe_offset +
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stripe_nr * map->stripe_len;
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if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1)) {
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if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
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BTRFS_BLOCK_GROUP_DUP)) {
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/* we limit the length of each bio to what fits in a stripe */
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*length = min_t(u64, em->len - offset,
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map->stripe_len - stripe_offset);
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