diff options
Diffstat (limited to 'volumes.c')
-rw-r--r-- | volumes.c | 211 |
1 files changed, 126 insertions, 85 deletions
@@ -399,7 +399,7 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, struct btrfs_device *device, u64 chunk_tree, u64 chunk_objectid, u64 chunk_offset, - u64 num_bytes, u64 *start) + u64 num_bytes, u64 *start, int convert) { int ret; struct btrfs_path *path; @@ -412,9 +412,15 @@ static int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - ret = find_free_dev_extent(trans, device, path, num_bytes, start); - if (ret) { - goto err; + /* + * For convert case, just skip search free dev_extent, as caller + * is responsible to make sure it's free. + */ + if (!convert) { + ret = find_free_dev_extent(trans, device, path, num_bytes, + start); + if (ret) + goto err; } key.objectid = device->devid; @@ -973,7 +979,7 @@ again: ret = btrfs_alloc_dev_extent(trans, device, info->chunk_root->root_key.objectid, BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset, - calc_size, &dev_offset); + calc_size, &dev_offset, 0); BUG_ON(ret); device->bytes_used += calc_size; @@ -1029,9 +1035,17 @@ again: return ret; } +/* + * Alloc a DATA chunk with SINGLE profile. + * + * If 'convert' is set, it will alloc a chunk with 1:1 mapping + * (btrfs logical bytenr == on-disk bytenr) + * For that case, caller must make sure the chunk and dev_extent are not + * occupied. + */ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans, struct btrfs_root *extent_root, u64 *start, - u64 num_bytes, u64 type) + u64 num_bytes, u64 type, int convert) { u64 dev_offset; struct btrfs_fs_info *info = extent_root->fs_info; @@ -1052,10 +1066,17 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans, key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; key.type = BTRFS_CHUNK_ITEM_KEY; - ret = find_next_chunk(chunk_root, BTRFS_FIRST_CHUNK_TREE_OBJECTID, - &key.offset); - if (ret) - return ret; + if (convert) { + BUG_ON(*start != round_down(*start, extent_root->sectorsize)); + key.offset = *start; + dev_offset = *start; + } else { + ret = find_next_chunk(chunk_root, + BTRFS_FIRST_CHUNK_TREE_OBJECTID, + &key.offset); + if (ret) + return ret; + } chunk = kmalloc(btrfs_chunk_item_size(num_stripes), GFP_NOFS); if (!chunk) @@ -1080,7 +1101,7 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans, ret = btrfs_alloc_dev_extent(trans, device, info->chunk_root->root_key.objectid, BTRFS_FIRST_CHUNK_TREE_OBJECTID, key.offset, - calc_size, &dev_offset); + calc_size, &dev_offset, convert); BUG_ON(ret); device->bytes_used += calc_size; @@ -1117,7 +1138,8 @@ int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans, ret = btrfs_insert_item(trans, chunk_root, &key, chunk, btrfs_chunk_item_size(num_stripes)); BUG_ON(ret); - *start = key.offset; + if (!convert) + *start = key.offset; map->ce.start = key.offset; map->ce.size = num_bytes; @@ -1587,7 +1609,92 @@ static struct btrfs_device *fill_missing_device(u64 devid) } /* - * Slot is used to verfy the chunk item is valid + * slot == -1: SYSTEM chunk + * return -EIO on error, otherwise return 0 + */ +static int btrfs_check_chunk_valid(struct btrfs_root *root, + struct extent_buffer *leaf, + struct btrfs_chunk *chunk, + int slot, u64 logical) +{ + u64 length; + u64 stripe_len; + u16 num_stripes; + u16 sub_stripes; + u64 type; + + length = btrfs_chunk_length(leaf, chunk); + stripe_len = btrfs_chunk_stripe_len(leaf, chunk); + num_stripes = btrfs_chunk_num_stripes(leaf, chunk); + sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); + type = btrfs_chunk_type(leaf, chunk); + + /* + * These valid checks may be insufficient to cover every corner cases. + */ + if (!IS_ALIGNED(logical, root->sectorsize)) { + error("invalid chunk logical %llu", logical); + return -EIO; + } + if (btrfs_chunk_sector_size(leaf, chunk) != root->sectorsize) { + error("invalid chunk sectorsize %llu", + (unsigned long long)btrfs_chunk_sector_size(leaf, chunk)); + return -EIO; + } + if (!length || !IS_ALIGNED(length, root->sectorsize)) { + error("invalid chunk length %llu", length); + return -EIO; + } + if (stripe_len != BTRFS_STRIPE_LEN) { + error("invalid chunk stripe length: %llu", stripe_len); + return -EIO; + } + /* Check on chunk item type */ + if (slot == -1 && (type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) { + error("invalid chunk type %llu", type); + return -EIO; + } + if (type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK | + BTRFS_BLOCK_GROUP_PROFILE_MASK)) { + error("unrecognized chunk type: %llu", + ~(BTRFS_BLOCK_GROUP_TYPE_MASK | + BTRFS_BLOCK_GROUP_PROFILE_MASK) & type); + return -EIO; + } + /* + * Btrfs_chunk contains at least one stripe, and for sys_chunk + * it can't exceed the system chunk array size + * For normal chunk, it should match its chunk item size. + */ + if (num_stripes < 1 || + (slot == -1 && sizeof(struct btrfs_stripe) * num_stripes > + BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) || + (slot >= 0 && sizeof(struct btrfs_stripe) * (num_stripes - 1) > + btrfs_item_size_nr(leaf, slot))) { + error("invalid num_stripes: %u", num_stripes); + return -EIO; + } + /* + * Device number check against profile + */ + if ((type & BTRFS_BLOCK_GROUP_RAID10 && sub_stripes == 0) || + (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) || + (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) || + (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) || + (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) || + ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 && + num_stripes != 1)) { + error("Invalid num_stripes:sub_stripes %u:%u for profile %llu", + num_stripes, sub_stripes, + type & BTRFS_BLOCK_GROUP_PROFILE_MASK); + return -EIO; + } + + return 0; +} + +/* + * Slot is used to verify the chunk item is valid * * For sys chunk in superblock, pass -1 to indicate sys chunk. */ @@ -1600,7 +1707,6 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, struct cache_extent *ce; u64 logical; u64 length; - u64 stripe_len; u64 devid; u8 uuid[BTRFS_UUID_SIZE]; int num_stripes; @@ -1609,32 +1715,14 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, logical = key->offset; length = btrfs_chunk_length(leaf, chunk); - stripe_len = btrfs_chunk_stripe_len(leaf, chunk); num_stripes = btrfs_chunk_num_stripes(leaf, chunk); /* Validation check */ - if (!num_stripes) { - error("invalid chunk num_stripes: %u", num_stripes); - return -EIO; - } - if (!IS_ALIGNED(logical, root->sectorsize)) { - error("invalid chunk logical %llu", logical); - return -EIO; - } - if (!length || !IS_ALIGNED(length, root->sectorsize)) { - error("invalid chunk length %llu", length); - return -EIO; - } - if (!is_power_of_2(stripe_len)) { - error("invalid chunk stripe length: %llu", stripe_len); - return -EIO; - } - if (~(BTRFS_BLOCK_GROUP_TYPE_MASK | BTRFS_BLOCK_GROUP_PROFILE_MASK) & - btrfs_chunk_type(leaf, chunk)) { - error("unrecognized chunk type: %llu", - ~(BTRFS_BLOCK_GROUP_TYPE_MASK | - BTRFS_BLOCK_GROUP_PROFILE_MASK) & - btrfs_chunk_type(leaf, chunk)); - return -EIO; + ret = btrfs_check_chunk_valid(root, leaf, chunk, slot, logical); + if (ret) { + error("%s checksums match, but it has an invalid chunk, %s", + (slot == -1) ? "Superblock" : "Metadata", + (slot == -1) ? "try btrfsck --repair -s <superblock> ie, 0,1,2" : ""); + return ret; } ce = search_cache_extent(&map_tree->cache_tree, logical); @@ -1658,50 +1746,6 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, map->type = btrfs_chunk_type(leaf, chunk); map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk); - /* Check on chunk item type */ - if (map->type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK | - BTRFS_BLOCK_GROUP_PROFILE_MASK)) { - fprintf(stderr, "Unknown chunk type bits: %llu\n", - map->type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK | - BTRFS_BLOCK_GROUP_PROFILE_MASK)); - ret = -EIO; - goto out; - } - - /* - * Btrfs_chunk contains at least one stripe, and for sys_chunk - * it can't exceed the system chunk array size - * For normal chunk, it should match its chunk item size. - */ - if (num_stripes < 1 || - (slot == -1 && sizeof(struct btrfs_stripe) * num_stripes > - BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) || - (slot >= 0 && sizeof(struct btrfs_stripe) * (num_stripes - 1) > - btrfs_item_size_nr(leaf, slot))) { - fprintf(stderr, "Invalid num_stripes: %u\n", - num_stripes); - ret = -EIO; - goto out; - } - - /* - * Device number check against profile - */ - if ((map->type & BTRFS_BLOCK_GROUP_RAID10 && map->sub_stripes == 0) || - (map->type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) || - (map->type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) || - (map->type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) || - (map->type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) || - ((map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 && - num_stripes != 1)) { - fprintf(stderr, - "Invalid num_stripes:sub_stripes %u:%u for profile %llu\n", - num_stripes, map->sub_stripes, - map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK); - ret = -EIO; - goto out; - } - for (i = 0; i < num_stripes; i++) { map->stripes[i].physical = btrfs_stripe_offset_nr(leaf, chunk, i); @@ -1722,9 +1766,6 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key, BUG_ON(ret); return 0; -out: - free(map); - return ret; } static int fill_device_from_item(struct extent_buffer *leaf, |