Btrfs: Add support for online device removal

[safe/jmp/linux-2.6] / fs / btrfs / inode.c

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index f7beb9b..b437d3b 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2194,6 +2194,8 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
 again:
        spin_lock(&em_tree->lock);
        em = lookup_extent_mapping(em_tree, start, len);
+       if (em)
+               em->bdev = root->fs_info->fs_devices->latest_bdev;
        spin_unlock(&em_tree->lock);
 
        if (em) {
@@ -2212,7 +2214,7 @@ again:
 
        em->start = EXTENT_MAP_HOLE;
        em->len = (u64)-1;
-       em->bdev = inode->i_sb->s_bdev;
+       em->bdev = root->fs_info->fs_devices->latest_bdev;
        ret = btrfs_lookup_file_extent(trans, root, path,
                                       objectid, start, trans != NULL);
        if (ret < 0) {
@@ -3101,6 +3103,27 @@ out:
        return ret;
 }
 
+long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
+{
+       struct btrfs_ioctl_vol_args *vol_args;
+       int ret;
+
+       vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
+
+       if (!vol_args)
+               return -ENOMEM;
+
+       if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
+               ret = -EFAULT;
+               goto out;
+       }
+       ret = btrfs_rm_device(root, vol_args->name);
+
+out:
+       kfree(vol_args);
+       return ret;
+}
+
 int dup_item_to_inode(struct btrfs_trans_handle *trans,
                       struct btrfs_root *root,
                       struct btrfs_path *path,
@@ -3294,6 +3317,8 @@ long btrfs_ioctl(struct file *file, unsigned int
                return btrfs_ioctl_resize(root, (void __user *)arg);
        case BTRFS_IOC_ADD_DEV:
                return btrfs_ioctl_add_dev(root, (void __user *)arg);
+       case BTRFS_IOC_RM_DEV:
+               return btrfs_ioctl_rm_dev(root, (void __user *)arg);
        case BTRFS_IOC_BALANCE:
                return btrfs_balance(root->fs_info->dev_root);
        case BTRFS_IOC_CLONE: