From patchwork Sat Oct 30 00:07:27 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugo Mills X-Patchwork-Id: 291482 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id o9U09cUf007062 for ; Sat, 30 Oct 2010 00:09:39 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762196Ab0J3AJg (ORCPT ); Fri, 29 Oct 2010 20:09:36 -0400 Received: from frost.carfax.org.uk ([212.13.194.111]:2451 "EHLO frost.carfax.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1762181Ab0J3AJe (ORCPT ); Fri, 29 Oct 2010 20:09:34 -0400 Received: from intmx.carfax.org.uk ([10.0.0.5] helo=vlad.carfax.org.uk ident=Debian-exim) by frost.carfax.org.uk with esmtp (Exim 4.69) (envelope-from ) id 1PBz0m-0000cL-O5 for linux-btrfs@vger.kernel.org; Sat, 30 Oct 2010 00:09:33 +0000 Received: from hrm by vlad.carfax.org.uk with local (Exim 4.72) (envelope-from ) id 1PBz0m-0003gj-6b; Sat, 30 Oct 2010 01:09:32 +0100 Message-Id: <20101030000741.689283553@carfax.org.uk> User-Agent: quilt/0.48-1 Date: Sat, 30 Oct 2010 01:07:27 +0100 From: Hugo Mills To: linux-btrfs@vger.kernel.org Cc: Hugo Mills Subject: [patch 1/2] Balance progress monitoring. References: <20101030000726.286517546@carfax.org.uk> Content-Disposition: inline; filename=progress-meter X-frost.carfax.org.uk-Spam-Score: -0.0 (/) X-frost.carfax.org.uk-Spam-Report: Spam detection software, running on the system "spamd0.lon.bitfolk.com", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: This patch introduces a basic form of progress monitoring for balance operations, by counting the number of block groups remaining. The information is exposed to userspace by an ioctl. Signed-off-by: Hugo Mills [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 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 (demeter1.kernel.org [140.211.167.41]); Sat, 30 Oct 2010 00:09:39 +0000 (UTC) Index: linux-mainline/fs/btrfs/ctree.h =================================================================== --- linux-mainline.orig/fs/btrfs/ctree.h 2010-10-26 18:03:38.000000000 +0100 +++ linux-mainline/fs/btrfs/ctree.h 2010-10-29 17:20:43.860460761 +0100 @@ -803,6 +803,11 @@ struct list_head cluster_list; }; +struct btrfs_balance_info { + u64 expected; + u64 completed; +}; + struct reloc_control; struct btrfs_device; struct btrfs_fs_devices; @@ -1010,6 +1015,10 @@ unsigned metadata_ratio; void *bdev_holder; + + /* Keep track of any rebalance operations on this FS */ + spinlock_t balance_info_lock; + struct btrfs_balance_info *balance_info; }; /* Index: linux-mainline/fs/btrfs/ioctl.c =================================================================== --- linux-mainline.orig/fs/btrfs/ioctl.c 2010-10-26 18:03:38.000000000 +0100 +++ linux-mainline/fs/btrfs/ioctl.c 2010-10-29 17:21:26.128742389 +0100 @@ -1984,6 +1984,38 @@ return 0; } +/* + * Return the current status of any balance operation + */ +long btrfs_ioctl_balance_progress( + struct btrfs_fs_info *fs_info, + struct btrfs_ioctl_balance_progress __user *user_dest) +{ + int ret = 0; + struct btrfs_ioctl_balance_progress dest; + + spin_lock(&fs_info->balance_info_lock); + if (!fs_info->balance_info) { + ret = -EINVAL; + goto error; + } + + dest.expected = fs_info->balance_info->expected; + dest.completed = fs_info->balance_info->completed; + + spin_unlock(&fs_info->balance_info_lock); + + if (copy_to_user(user_dest, &dest, + sizeof(struct btrfs_ioctl_balance_progress))) + return -EFAULT; + + return 0; + +error: + spin_unlock(&fs_info->balance_info_lock); + return ret; +} + long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { @@ -2017,6 +2049,8 @@ return btrfs_ioctl_rm_dev(root, argp); case BTRFS_IOC_BALANCE: return btrfs_balance(root->fs_info->dev_root); + case BTRFS_IOC_BALANCE_PROGRESS: + return btrfs_ioctl_balance_progress(root->fs_info, argp); case BTRFS_IOC_CLONE: return btrfs_ioctl_clone(file, arg, 0, 0, 0); case BTRFS_IOC_CLONE_RANGE: Index: linux-mainline/fs/btrfs/ioctl.h =================================================================== --- linux-mainline.orig/fs/btrfs/ioctl.h 2010-10-26 18:03:38.000000000 +0100 +++ linux-mainline/fs/btrfs/ioctl.h 2010-10-29 17:05:44.447028825 +0100 @@ -138,6 +138,11 @@ struct btrfs_ioctl_space_info spaces[0]; }; +struct btrfs_ioctl_balance_progress { + __u64 expected; + __u64 completed; +}; + #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \ struct btrfs_ioctl_vol_args) #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \ @@ -178,4 +183,6 @@ #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_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 21, \ + struct btrfs_ioctl_balance_progress) #endif Index: linux-mainline/fs/btrfs/volumes.c =================================================================== --- linux-mainline.orig/fs/btrfs/volumes.c 2010-10-26 18:03:38.000000000 +0100 +++ linux-mainline/fs/btrfs/volumes.c 2010-10-29 17:23:40.463279287 +0100 @@ -1902,6 +1902,7 @@ struct btrfs_root *chunk_root = dev_root->fs_info->chunk_root; struct btrfs_trans_handle *trans; struct btrfs_key found_key; + struct btrfs_balance_status *bal_info; if (dev_root->fs_info->sb->s_flags & MS_RDONLY) return -EROFS; @@ -1909,6 +1910,18 @@ mutex_lock(&dev_root->fs_info->volume_mutex); dev_root = dev_root->fs_info->dev_root; + dev_root->fs_info->balance_info = kmalloc( + sizeof(struct btrfs_balance_info), + GFP_NOFS); + if (!dev_root->fs_info->balance_info) { + ret = -ENOSPC; + goto error_no_status; + } + bal_info = dev_root->fs_info->balance_info; + bal_info->expected = -1; /* One less than actually counted, + because chunk 0 is special */ + bal_info->completed = 0; + /* step one make some room on all the devices */ list_for_each_entry(device, devices, dev_list) { old_size = device->total_bytes; @@ -1932,10 +1945,40 @@ btrfs_end_transaction(trans, dev_root); } - /* step two, relocate all the chunks */ + /* step two, count the chunks */ path = btrfs_alloc_path(); - BUG_ON(!path); + if (!path) { + ret = -ENOSPC; + goto error; + } + + key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + key.offset = (u64)-1; + key.type = BTRFS_CHUNK_ITEM_KEY; + + ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0); + if (ret <= 0) { + printk(KERN_ERR "btrfs: Failed to find the last chunk.\n"); + BUG(); + } + + while (1) { + ret = btrfs_previous_item(chunk_root, path, 0, + BTRFS_CHUNK_ITEM_KEY); + if (ret) + break; + + bal_info->expected++; + } + + btrfs_free_path(path); + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOSPC; + goto error; + } + /* step three, relocate all the chunks */ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; key.offset = (u64)-1; key.type = BTRFS_CHUNK_ITEM_KEY; @@ -1976,10 +2019,18 @@ found_key.offset); BUG_ON(ret && ret != -ENOSPC); key.offset = found_key.offset - 1; + bal_info->completed++; + printk(KERN_INFO "btrfs: balance: %llu/%llu block groups completed\n", + bal_info->completed, bal_info->expected); } ret = 0; error: btrfs_free_path(path); + spin_lock(&dev_root->fs_info->balance_info_lock); + kfree(dev_root->fs_info->balance_info); + dev_root->fs_info->balance_info = NULL; + spin_unlock(&dev_root->fs_info->balance_info_lock); +error_no_status: mutex_unlock(&dev_root->fs_info->volume_mutex); return ret; } Index: linux-mainline/fs/btrfs/disk-io.c =================================================================== --- linux-mainline.orig/fs/btrfs/disk-io.c 2010-10-29 17:19:12.404178865 +0100 +++ linux-mainline/fs/btrfs/disk-io.c 2010-10-29 17:20:02.022161666 +0100 @@ -1591,6 +1591,7 @@ spin_lock_init(&fs_info->ref_cache_lock); spin_lock_init(&fs_info->fs_roots_radix_lock); spin_lock_init(&fs_info->delayed_iput_lock); + spin_lock_init(&fs_info->balance_info_lock); init_completion(&fs_info->kobj_unregister); fs_info->tree_root = tree_root; @@ -1616,6 +1617,7 @@ fs_info->sb = sb; fs_info->max_inline = 8192 * 1024; fs_info->metadata_ratio = 0; + fs_info->balance_info = NULL; fs_info->thread_pool_size = min_t(unsigned long, num_online_cpus() + 2, 8);