From patchwork Mon Jul 26 15:30:53 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulrich Hecht X-Patchwork-Id: 114293 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o6QFV1gf011447 for ; Mon, 26 Jul 2010 15:31:02 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754324Ab0GZPa7 (ORCPT ); Mon, 26 Jul 2010 11:30:59 -0400 Received: from cantor.suse.de ([195.135.220.2]:44945 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752658Ab0GZPa7 (ORCPT ); Mon, 26 Jul 2010 11:30:59 -0400 Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.221.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.suse.de (Postfix) with ESMTP id 277B894430 for ; Mon, 26 Jul 2010 17:30:58 +0200 (CEST) From: Ulrich Hecht To: linux-btrfs@vger.kernel.org Cc: uli@suse.de Subject: [PATCH] Btrfs: compressed file size ioctl Date: Mon, 26 Jul 2010 17:30:53 +0200 Message-Id: <1280158253-10515-1-git-send-email-uli@suse.de> X-Mailer: git-send-email 1.7.1 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Mon, 26 Jul 2010 15:31:02 +0000 (UTC) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 9254b3d..d18401b 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1750,6 +1750,107 @@ out_drop_write: return ret; } +static long btrfs_ioctl_compsize(struct file *file, void __user *argp) +{ + /* This ioctl returns the compressed size of an inode on disk + * by counting the on-disk space used by all of its extents. + */ + struct inode *inode = fdentry(file)->d_inode; + struct btrfs_root *root = BTRFS_I(inode)->root; + struct btrfs_path *path; + struct extent_buffer *leaf; + struct btrfs_key key; + u32 nritems; + int slot; + u64 olen = inode->i_size; + u64 len = olen; + long ret; + u64 compressed_size = 0; + + if (S_ISDIR(inode->i_mode)) + return -EISDIR; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + path->reada = 2; + mutex_lock(&inode->i_mutex); + + /* do any pending delalloc/csum calc on inode, one way or + another, and lock file content */ + btrfs_wait_ordered_range(inode, 0, (u64)-1); + + /* 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; + + 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