Btrfs: fix send issuing outdated paths for utimes, chown and chmod
When doing an incremental send, if we had a directory pending a move/rename
operation and none of its parents, except for the immediate parent, were
pending a move/rename, after processing the directory's references, we would
be issuing utimes, chown and chmod intructions against am outdated path - a
path which matched the one in the parent root.
This change also simplifies a bit the code that deals with building a path
for a directory which has a move/rename operation delayed.
Steps to reproduce:
$ mkfs.btrfs -f /dev/sdb3
$ mount /dev/sdb3 /mnt/btrfs
$ mkdir -p /mnt/btrfs/a/b/c/d/e
$ mkdir /mnt/btrfs/a/b/c/f
$ chmod 0777 /mnt/btrfs/a/b/c/d/e
$ btrfs subvolume snapshot -r /mnt/btrfs /mnt/btrfs/snap1
$ btrfs send /mnt/btrfs/snap1 -f /tmp/base.send
$ mv /mnt/btrfs/a/b/c/f /mnt/btrfs/a/b/f2
$ mv /mnt/btrfs/a/b/c/d/e /mnt/btrfs/a/b/f2/e2
$ mv /mnt/btrfs/a/b/c /mnt/btrfs/a/b/c2
$ mv /mnt/btrfs/a/b/c2/d /mnt/btrfs/a/b/c2/d2
$ chmod 0700 /mnt/btrfs/a/b/f2/e2
$ btrfs subvolume snapshot -r /mnt/btrfs /mnt/btrfs/snap2
$ btrfs send -p /mnt/btrfs/snap1 /mnt/btrfs/snap2 -f /tmp/incremental.send
$ umount /mnt/btrfs
$ mkfs.btrfs -f /dev/sdb3
$ mount /dev/sdb3 /mnt/btrfs
$ btrfs receive /mnt/btrfs -f /tmp/base.send
$ btrfs receive /mnt/btrfs -f /tmp/incremental.send
The second btrfs receive command failed with:
ERROR: chmod a/b/c/d/e failed. No such file or directory
A test case for xfstests follows.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 46c6b54..298e25d 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -2000,7 +2000,6 @@
*/
static int __get_cur_name_and_parent(struct send_ctx *sctx,
u64 ino, u64 gen,
- int skip_name_cache,
u64 *parent_ino,
u64 *parent_gen,
struct fs_path *dest)
@@ -2010,8 +2009,6 @@
struct btrfs_path *path = NULL;
struct name_cache_entry *nce = NULL;
- if (skip_name_cache)
- goto get_ref;
/*
* First check if we already did a call to this function with the same
* ino/gen. If yes, check if the cache entry is still up-to-date. If yes
@@ -2056,12 +2053,11 @@
goto out_cache;
}
-get_ref:
/*
* Depending on whether the inode was already processed or not, use
* send_root or parent_root for ref lookup.
*/
- if (ino < sctx->send_progress && !skip_name_cache)
+ if (ino < sctx->send_progress)
ret = get_first_ref(sctx->send_root, ino,
parent_ino, parent_gen, dest);
else
@@ -2085,8 +2081,6 @@
goto out;
ret = 1;
}
- if (skip_name_cache)
- goto out;
out_cache:
/*
@@ -2154,7 +2148,6 @@
u64 parent_inode = 0;
u64 parent_gen = 0;
int stop = 0;
- int skip_name_cache = 0;
name = fs_path_alloc();
if (!name) {
@@ -2162,9 +2155,6 @@
goto out;
}
- if (is_waiting_for_move(sctx, ino))
- skip_name_cache = 1;
-
dest->reversed = 1;
fs_path_reset(dest);
@@ -2179,16 +2169,19 @@
break;
}
- ret = __get_cur_name_and_parent(sctx, ino, gen, skip_name_cache,
- &parent_inode, &parent_gen, name);
+ if (is_waiting_for_move(sctx, ino)) {
+ ret = get_first_ref(sctx->parent_root, ino,
+ &parent_inode, &parent_gen, name);
+ } else {
+ ret = __get_cur_name_and_parent(sctx, ino, gen,
+ &parent_inode,
+ &parent_gen, name);
+ if (ret)
+ stop = 1;
+ }
+
if (ret < 0)
goto out;
- if (ret)
- stop = 1;
-
- if (!skip_name_cache &&
- is_waiting_for_move(sctx, parent_inode))
- skip_name_cache = 1;
ret = fs_path_add_path(dest, name);
if (ret < 0)