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authorDavid Sterba <dsterba@suse.cz>2011-08-01 18:11:57 +0200
committerAlexander Block <ablock84@googlemail.com>2012-07-25 17:33:09 +0200
commit362a20c5e27614739c46707d1c5f55c214d164ce (patch)
tree82be478b5d25808ea823bcee1efccbfbec05840b /fs
parent28a33cbc24e4256c143dce96c7d93bf423229f92 (diff)
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btrfs: allow cross-subvolume file clone
Lift the EXDEV condition and allow different root trees for files being cloned, then pass source inode's root when searching for extents. Cloning is not allowed to cross vfsmounts, ie. when two subvolumes from one filesystem are mounted separately. Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/ioctl.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 0e92e5763005..7011871c45b8 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2340,6 +2340,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
goto out_drop_write;
}
+ ret = -EXDEV;
+ if (src_file->f_path.mnt != file->f_path.mnt)
+ goto out_fput;
+
src = src_file->f_dentry->d_inode;
ret = -EINVAL;
@@ -2360,7 +2364,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
goto out_fput;
ret = -EXDEV;
- if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root)
+ if (src->i_sb != inode->i_sb)
goto out_fput;
ret = -ENOMEM;
@@ -2434,13 +2438,14 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
* note the key will change type as we walk through the
* tree.
*/
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ ret = btrfs_search_slot(NULL, BTRFS_I(src)->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);
+ ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
if (ret < 0)
goto out;
if (ret > 0)