On Mon, 26 Jul 2010 17:30:53 +0200, Ulrich Hecht wrote:
[snip]
> +static long btrfs_ioctl_compsize(struct file *file, void __user *argp)
> +{
[snip]
> +
> + /* search for the inode */
> + key.objectid = inode->i_ino;
> + key.type = BTRFS_EXTENT_DATA_KEY;
> + key.offset = 0;
> +
> + while (1) {
> + /* note the key will change type as we walk through the tree */
> + ret = btrfs_search_slot(NULL, root,&key, path, 0, 0);
> + if (ret< 0)
> + goto out;
Why don't you use btrfs_get_extent() to implement it?
Thanks
Miao
> +
> + nritems = btrfs_header_nritems(path->nodes[0]);
> + if (path->slots[0]>= nritems) {
> + ret = btrfs_next_leaf(root, path);
> + if (ret< 0)
> + goto out;
> + if (ret> 0)
> + break;
> + nritems = btrfs_header_nritems(path->nodes[0]);
> + }
> + leaf = path->nodes[0];
> + slot = path->slots[0];
> +
> + btrfs_item_key_to_cpu(leaf,&key, slot);
> + if (btrfs_key_type(&key)> BTRFS_EXTENT_DATA_KEY ||
> + key.objectid != inode->i_ino)
> + break;
> +
> + if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
> + struct btrfs_file_extent_item *extent;
> + int type;
> + u64 datal = 0;
> +
> + extent = btrfs_item_ptr(leaf, slot,
> + struct btrfs_file_extent_item);
> + type = btrfs_file_extent_type(leaf, extent);
> + if (type == BTRFS_FILE_EXTENT_REG) {
> + datal = btrfs_file_extent_num_bytes(leaf,
> + extent);
> + compressed_size +=
> + btrfs_file_extent_disk_num_bytes(leaf,
> + extent);
> + } else if (type == BTRFS_FILE_EXTENT_INLINE) {
> + datal = btrfs_file_extent_ram_bytes(leaf,
> + extent);
> + compressed_size +=
> + btrfs_file_extent_inline_item_len(leaf,
> + btrfs_item_nr(leaf, slot));
> + }
> + btrfs_release_path(root, path);
> + }
> +
> + btrfs_release_path(root, path);
> + key.offset++;
> + }
> +
> + /* We've succeeded in going through all extents; set the final size. */
> + if (copy_to_user(argp,&compressed_size, sizeof(compressed_size)))
> + ret = -EFAULT;
> + else
> + ret = 0;
> +
> +out:
> + btrfs_release_path(root, path);
> + unlock_extent(&BTRFS_I(inode)->io_tree, 0, len, GFP_NOFS);
> + mutex_unlock(&inode->i_mutex);
> + btrfs_free_path(path);
> + return ret;
> +}
> +
> static long btrfs_ioctl_clone_range(struct file *file, void __user *argp)
> {
> struct btrfs_ioctl_clone_range_args args;
> @@ -2034,6 +2135,8 @@ long btrfs_ioctl(struct file *file, unsigned int
> case BTRFS_IOC_SYNC:
> btrfs_sync_fs(file->f_dentry->d_sb, 1);
> return 0;
> + case BTRFS_IOC_COMPR_SIZE:
> + return btrfs_ioctl_compsize(file, argp);
> }
>
> return -ENOTTY;
> diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
> index 424694a..a01ef1e 100644
> --- a/fs/btrfs/ioctl.h
> +++ b/fs/btrfs/ioctl.h
> @@ -178,4 +178,5 @@ struct btrfs_ioctl_space_args {
> #define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
> #define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
> struct btrfs_ioctl_space_args)
> +#define BTRFS_IOC_COMPR_SIZE _IOR(BTRFS_IOCTL_MAGIC, 21, u64)
> #endif
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