static DEFINE_MUTEX(uuid_mutex);
static LIST_HEAD(fs_uuids);
+void btrfs_lock_volumes(void)
+{
+ mutex_lock(&uuid_mutex);
+}
+
+void btrfs_unlock_volumes(void)
+{
+ mutex_unlock(&uuid_mutex);
+}
+
int btrfs_cleanup_fs_uuids(void)
{
struct btrfs_fs_devices *fs_devices;
ret = PTR_ERR(bdev);
goto fail;
}
+ set_blocksize(bdev, 4096);
if (device->devid == fs_devices->latest_devid)
fs_devices->latest_bdev = bdev;
if (device->devid == fs_devices->lowest_devid) {
fs_devices->lowest_bdev = bdev;
}
device->bdev = bdev;
+
}
mutex_unlock(&uuid_mutex);
return 0;
struct btrfs_path *path;
struct btrfs_root *root = device->dev_root;
struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf = NULL;
+ struct btrfs_dev_extent *extent = NULL;
path = btrfs_alloc_path();
if (!path)
key.type = BTRFS_DEV_EXTENT_KEY;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0) {
+ ret = btrfs_previous_item(root, path, key.objectid,
+ BTRFS_DEV_EXTENT_KEY);
+ BUG_ON(ret);
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ BUG_ON(found_key.offset > start || found_key.offset +
+ btrfs_dev_extent_length(leaf, extent) < start);
+ ret = 0;
+ } else if (ret == 0) {
+ leaf = path->nodes[0];
+ extent = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_dev_extent);
+ }
BUG_ON(ret);
+ device->bytes_used -= btrfs_dev_extent_length(leaf, extent);
ret = btrfs_del_item(trans, root, path);
BUG_ON(ret);
return ret;
}
+static int btrfs_rm_dev_item(struct btrfs_root *root,
+ struct btrfs_device *device)
+{
+ int ret;
+ struct btrfs_path *path;
+ struct block_device *bdev = device->bdev;
+ struct btrfs_device *next_dev;
+ struct btrfs_key key;
+ u64 total_bytes;
+ struct btrfs_fs_devices *fs_devices;
+ struct btrfs_trans_handle *trans;
+
+ root = root->fs_info->chunk_root;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ trans = btrfs_start_transaction(root, 1);
+ key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ key.type = BTRFS_DEV_ITEM_KEY;
+ key.offset = device->devid;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = btrfs_del_item(trans, root, path);
+ if (ret)
+ goto out;
+
+ /*
+ * at this point, the device is zero sized. We want to
+ * remove it from the devices list and zero out the old super
+ */
+ list_del_init(&device->dev_list);
+ list_del_init(&device->dev_alloc_list);
+ fs_devices = root->fs_info->fs_devices;
+
+ next_dev = list_entry(fs_devices->devices.next, struct btrfs_device,
+ dev_list);
+ if (bdev == fs_devices->lowest_bdev)
+ fs_devices->lowest_bdev = next_dev->bdev;
+ if (bdev == root->fs_info->sb->s_bdev)
+ root->fs_info->sb->s_bdev = next_dev->bdev;
+ if (bdev == fs_devices->latest_bdev)
+ fs_devices->latest_bdev = next_dev->bdev;
+
+ total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
+ btrfs_set_super_total_bytes(&root->fs_info->super_copy,
+ total_bytes - device->total_bytes);
+
+ total_bytes = btrfs_super_num_devices(&root->fs_info->super_copy);
+ btrfs_set_super_num_devices(&root->fs_info->super_copy,
+ total_bytes - 1);
+out:
+ btrfs_free_path(path);
+ btrfs_commit_transaction(trans, root);
+ return ret;
+}
+
+int btrfs_rm_device(struct btrfs_root *root, char *device_path)
+{
+ struct btrfs_device *device;
+ struct block_device *bdev;
+ struct buffer_head *bh;
+ struct btrfs_super_block *disk_super;
+ u64 all_avail;
+ u64 devid;
+ int ret = 0;
+
+ mutex_lock(&root->fs_info->fs_mutex);
+ mutex_lock(&uuid_mutex);
+
+ all_avail = root->fs_info->avail_data_alloc_bits |
+ root->fs_info->avail_system_alloc_bits |
+ root->fs_info->avail_metadata_alloc_bits;
+
+ if ((all_avail & BTRFS_BLOCK_GROUP_RAID10) &&
+ root->fs_info->fs_devices->num_devices <= 4) {
+ printk("btrfs: unable to go below four devices on raid10\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if ((all_avail & BTRFS_BLOCK_GROUP_RAID1) &&
+ root->fs_info->fs_devices->num_devices <= 2) {
+ printk("btrfs: unable to go below two devices on raid1\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ bdev = open_bdev_excl(device_path, 0, root->fs_info->bdev_holder);
+ if (IS_ERR(bdev)) {
+ ret = PTR_ERR(bdev);
+ goto out;
+ }
+
+ bh = __bread(bdev, BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh) {
+ ret = -EIO;
+ goto error_close;
+ }
+ disk_super = (struct btrfs_super_block *)bh->b_data;
+ if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
+ sizeof(disk_super->magic))) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ if (memcmp(disk_super->fsid, root->fs_info->fsid, BTRFS_FSID_SIZE)) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+ devid = le64_to_cpu(disk_super->dev_item.devid);
+ device = btrfs_find_device(root, devid, NULL);
+ if (!device) {
+ ret = -ENOENT;
+ goto error_brelse;
+ }
+
+ root->fs_info->fs_devices->num_devices--;
+
+ ret = btrfs_shrink_device(device, 0);
+ if (ret)
+ goto error_brelse;
+
+
+ ret = btrfs_rm_dev_item(root->fs_info->chunk_root, device);
+ if (ret)
+ goto error_brelse;
+
+ /* make sure this device isn't detected as part of the FS anymore */
+ memset(&disk_super->magic, 0, sizeof(disk_super->magic));
+ set_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
+
+ brelse(bh);
+
+ /* one close for the device struct or super_block */
+ close_bdev_excl(device->bdev);
+
+ /* one close for us */
+ close_bdev_excl(device->bdev);
+
+ kfree(device->name);
+ kfree(device);
+ ret = 0;
+ goto out;
+
+error_brelse:
+ brelse(bh);
+error_close:
+ close_bdev_excl(bdev);
+out:
+ mutex_unlock(&uuid_mutex);
+ mutex_unlock(&root->fs_info->fs_mutex);
+ return ret;
+}
+
int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
{
struct btrfs_trans_handle *trans;
em = lookup_extent_mapping(em_tree, chunk_offset, 1);
spin_unlock(&em_tree->lock);
- BUG_ON(em->start > chunk_offset || em->start + em->len < chunk_offset);
+ BUG_ON(em->start > chunk_offset ||
+ em->start + em->len < chunk_offset);
map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) {
ret = btrfs_free_dev_extent(trans, map->stripes[i].dev,
map->stripes[i].physical);
BUG_ON(ret);
+
+ ret = btrfs_update_device(trans, map->stripes[i].dev);
+ BUG_ON(ret);
}
ret = btrfs_free_chunk(trans, root, chunk_tree, chunk_objectid,
chunk_offset);
if (map->type & BTRFS_BLOCK_GROUP_SYSTEM) {
ret = btrfs_del_sys_chunk(root, chunk_objectid, chunk_offset);
BUG_ON(ret);
- goto out;
}
-
-
spin_lock(&em_tree->lock);
remove_extent_mapping(em_tree, em);
kfree(map);
free_extent_map(em);
spin_unlock(&em_tree->lock);
-out:
/* once for us */
free_extent_map(em);
return 0;
if (!em) {
- printk("unable to find logical %Lu\n", logical);
+ printk("unable to find logical %Lu len %Lu\n", logical, *length);
BUG();
}
logical = key->offset;
length = btrfs_chunk_length(leaf, chunk);
+
spin_lock(&map_tree->map_tree.lock);
em = lookup_extent_mapping(&map_tree->map_tree, logical, 1);
spin_unlock(&map_tree->map_tree.lock);
int btrfs_read_sys_array(struct btrfs_root *root)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
- struct extent_buffer *sb = root->fs_info->sb_buffer;
+ struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;
u8 *ptr;
u32 cur;
struct btrfs_key key;
+ sb = btrfs_find_create_tree_block(root, BTRFS_SUPER_INFO_OFFSET,
+ BTRFS_SUPER_INFO_SIZE);
+ if (!sb)
+ return -ENOMEM;
+ btrfs_set_buffer_uptodate(sb);
+ write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
array_size = btrfs_super_sys_array_size(super_copy);
ptr = super_copy->sys_chunk_array;
disk_key = (struct btrfs_disk_key *)ptr;
btrfs_disk_key_to_cpu(&key, disk_key);
- len = sizeof(*disk_key);
- ptr += len;
+ len = sizeof(*disk_key); ptr += len;
sb_ptr += len;
cur += len;
sb_ptr += len;
cur += len;
}
+ free_extent_buffer(sb);
return ret;
}
projects / deliverable / linux.git / blobdiff