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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>
This commit is contained in:
Filipe Manana 2014-03-22 17:15:24 +00:00 committed by Chris Mason
parent b46ab97bcd
commit c992ec94f2
1 changed files with 10 additions and 25 deletions
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35
fs/btrfs/send.c
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@ -3055,32 +3055,17 @@ 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,
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);
name = NULL;
to_path = fs_path_alloc();
if (!to_path) {
ret = -ENOMEM;
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;
fs_path_reset(name);
to_path = name;
name = NULL;
sctx->send_progress = sctx->cur_ino + 1;
ret = get_cur_path(sctx, pm->ino, pm->gen, to_path);