Commit c992ec94 authored Mar 22, 2014 by Filipe Manana Committed by Chris Mason Jun 09, 2014

Btrfs: send, account for orphan directories when building path strings



If we have directories with a pending move/rename operation, we must take into
account any orphan directories that got created before executing the pending
move/rename. Those orphan directories are directories with an inode number higher
then the current send progress and that don't exist in the parent snapshot, they
are created before current progress reaches their inode number, with a generated
name of the form oN-M-I and at the root of the filesystem tree, and later when
progress matches their inode number, moved/renamed to their final location.

Reproducer:

          $ mkfs.btrfs -f /dev/sdd
          $ mount /dev/sdd /mnt

          $ mkdir -p /mnt/a/b/c/d
          $ mkdir /mnt/a/b/e
          $ mv /mnt/a/b/c /mnt/a/b/e/CC
          $ mkdir /mnt/a/b/e/CC/d/f
	  $ mkdir /mnt/a/g

          $ btrfs subvolume snapshot -r /mnt /mnt/snap1
          $ btrfs send /mnt/snap1 -f /tmp/base.send

          $ mkdir /mnt/a/g/h
	  $ mv /mnt/a/b/e /mnt/a/g/h/EE
          $ mv /mnt/a/g/h/EE/CC/d /mnt/a/g/h/EE/DD

          $ btrfs subvolume snapshot -r /mnt /mnt/snap2
          $ btrfs send -p /mnt/snap1 /mnt/snap2 -f /tmp/incremental.send

The second receive command failed with the following error:

    ERROR: rename a/b/e/CC/d -> o264-7-0/EE/DD failed. No such file or directory

A test case for xfstests follows soon.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>

parent b46ab97b

fs/btrfs/send.c

+9 −24

Original line number	Diff line number	Diff line
		@@ -3055,33 +3055,18 @@ static int apply_dir_move(struct send_ctx sctx, struct pending_dir_move pm)
		if (ret < 0)
		goto out;

		if (parent_ino == sctx->cur_ino) {
		/* child only renamed, not moved */
		ASSERT(parent_gen == sctx->cur_inode_gen);
		ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen,
		ret = get_cur_path(sctx, parent_ino, parent_gen,
		from_path);
		if (ret < 0)
		goto out;
		ret = fs_path_add_path(from_path, name);
		if (ret < 0)
		goto out;
		} else {
		/* child moved and maybe renamed too */
		sctx->send_progress = pm->ino;
		ret = get_cur_path(sctx, pm->ino, pm->gen, from_path);
		if (ret < 0)
		goto out;
		}

		fs_path_free(name);
		fs_path_reset(name);
		to_path = name;
		name = NULL;

		to_path = fs_path_alloc();
		if (!to_path) {
		ret = -ENOMEM;
		goto out;
		}

		sctx->send_progress = sctx->cur_ino + 1;
		ret = get_cur_path(sctx, pm->ino, pm->gen, to_path);
		if (ret < 0)

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