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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>
This commit is contained in:
David Sterba 2011-08-01 18:11:57 +02:00 committed by Alexander Block
parent 28a33cbc24
commit 362a20c5e2
1 changed files with 8 additions and 3 deletions
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11
fs/btrfs/ioctl.c
View File

@ -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)