diff options
Diffstat (limited to 'free-space-cache.c')
| -rw-r--r-- | free-space-cache.c | 129 |
1 files changed, 128 insertions, 1 deletions
diff --git a/free-space-cache.c b/free-space-cache.c index 357d69e7..286b185e 100644 --- a/free-space-cache.c +++ b/free-space-cache.c @@ -25,6 +25,7 @@ #include "crc32c.h" #include "bitops.h" #include "internal.h" +#include "utils.h" /* * Kernel always uses PAGE_CACHE_SIZE for sectorsize, but we don't have @@ -210,7 +211,7 @@ static int io_ctl_check_crc(struct io_ctl *io_ctl, int index) io_ctl_map_page(io_ctl, 0); crc = crc32c(crc, io_ctl->orig + offset, io_ctl->root->sectorsize - offset); - btrfs_csum_final(crc, (char *)&crc); + btrfs_csum_final(crc, (u8 *)&crc); if (val != crc) { printk("btrfs: csum mismatch on free space cache\n"); io_ctl_unmap_page(io_ctl); @@ -877,3 +878,129 @@ next: prev = e; } } + +int btrfs_clear_free_space_cache(struct btrfs_fs_info *fs_info, + struct btrfs_block_group_cache *bg) +{ + struct btrfs_trans_handle *trans; + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_path path; + struct btrfs_key key; + struct btrfs_disk_key location; + struct btrfs_free_space_header *sc_header; + struct extent_buffer *node; + u64 ino; + int slot; + int ret; + + trans = btrfs_start_transaction(tree_root, 1); + if (IS_ERR(trans)) + return PTR_ERR(trans); + + btrfs_init_path(&path); + + key.objectid = BTRFS_FREE_SPACE_OBJECTID; + key.type = 0; + key.offset = bg->key.objectid; + + ret = btrfs_search_slot(trans, tree_root, &key, &path, -1, 1); + if (ret > 0) { + ret = 0; + goto out; + } + if (ret < 0) + goto out; + + node = path.nodes[0]; + slot = path.slots[0]; + sc_header = btrfs_item_ptr(node, slot, struct btrfs_free_space_header); + btrfs_free_space_key(node, sc_header, &location); + ino = location.objectid; + + /* Delete the free space header, as we have the ino to continue */ + ret = btrfs_del_item(trans, tree_root, &path); + if (ret < 0) { + error("failed to remove free space header for block group %llu: %d", + bg->key.objectid, ret); + goto out; + } + btrfs_release_path(&path); + + /* Iterate from the end of the free space cache inode */ + key.objectid = ino; + key.type = BTRFS_EXTENT_DATA_KEY; + key.offset = (u64)-1; + ret = btrfs_search_slot(trans, tree_root, &key, &path, -1, 1); + if (ret < 0) { + error("failed to locate free space cache extent for block group %llu: %d", + bg->key.objectid, ret); + goto out; + } + while (1) { + struct btrfs_file_extent_item *fi; + u64 disk_bytenr; + u64 disk_num_bytes; + + ret = btrfs_previous_item(tree_root, &path, ino, + BTRFS_EXTENT_DATA_KEY); + if (ret > 0) { + ret = 0; + break; + } + if (ret < 0) { + error( + "failed to locate free space cache extent for block group %llu: %d", + bg->key.objectid, ret); + goto out; + } + node = path.nodes[0]; + slot = path.slots[0]; + btrfs_item_key_to_cpu(node, &key, slot); + fi = btrfs_item_ptr(node, slot, struct btrfs_file_extent_item); + disk_bytenr = btrfs_file_extent_disk_bytenr(node, fi); + disk_num_bytes = btrfs_file_extent_disk_num_bytes(node, fi); + + ret = btrfs_free_extent(trans, tree_root, disk_bytenr, + disk_num_bytes, 0, tree_root->objectid, + ino, key.offset); + if (ret < 0) { + error("failed to remove backref for disk bytenr %llu: %d", + disk_bytenr, ret); + goto out; + } + ret = btrfs_del_item(trans, tree_root, &path); + if (ret < 0) { + error( + "failed to remove free space extent data for ino %llu offset %llu: %d", + ino, key.offset, ret); + goto out; + } + } + btrfs_release_path(&path); + + /* Now delete free space cache inode item */ + key.objectid = ino; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + + ret = btrfs_search_slot(trans, tree_root, &key, &path, -1, 1); + if (ret > 0) + warning("free space inode %llu not found, ignore", ino); + if (ret < 0) { + error( + "failed to locate free space cache inode %llu for block group %llu: %d", + ino, bg->key.objectid, ret); + goto out; + } + ret = btrfs_del_item(trans, tree_root, &path); + if (ret < 0) { + error( + "failed to delete free space cache inode %llu for block group %llu: %d", + ino, bg->key.objectid, ret); + } +out: + btrfs_release_path(&path); + if (!ret) + btrfs_commit_transaction(trans, tree_root); + return ret; +} |