Hi Robert,
can you pls apply this patch. It should solve the issue (your script
now runs ok for me).

Alex.

diff --git a/cmds-receive.c b/cmds-receive.c
index a8be6fa..3ee2ff8 100644
--- a/cmds-receive.c
+++ b/cmds-receive.c

@@ -792,11 +792,18 @@ int do_receive(struct btrfs_receive *r, const

char *tomnt, int r_fd)
        int ret;
        int end = 0;

-       r->root_path = strdup(tomnt);
-       r->mnt_fd = open(tomnt, O_RDONLY | O_NOATIME);
+       r->root_path = realpath(tomnt, NULL);
+       if (!r->root_path) {
+               ret = -errno;
+               fprintf(stderr, "ERROR: realpath %s failed. "
+                               "%s\n", tomnt, strerror(-ret));
+               goto out;
+       }
+
+       r->mnt_fd = open(r->root_path, O_RDONLY | O_NOATIME);
        if (r->mnt_fd < 0) {
                ret = -errno;
-               fprintf(stderr, "ERROR: failed to open %s. %s\n", tomnt,
+               fprintf(stderr, "ERROR: failed to open %s. %s\n", r->root_path,
                                strerror(-ret));
                goto out;
        }








On Tue, Aug 28, 2012 at 11:27 AM, Alex Lyakas
[off-list ref] wrote:

Thank you, Robert for the detailed data. I will debug & get back to
you before Friday.

Alex.


On Mon, Aug 27, 2012 at 9:37 PM, Robert Buhren [off-list ref] wrote:

quoted

Hi Alex,

i've made a list of all commands i executed for this test. You can find it
here:

http://pastebin.com/y8PBgmMZ

quoted

Hi Robert,
do you think you can make the "root_snap_send" file of yours available
anywhere (not sure how big it is)?

I'm afraid i've already delete it :/ sry. But in the pastebin there should
be all the commands
you need to execute to reproduce my setup.

quoted

Also, I am not sure I understand how you btrfs tree looks like WRT to
where all subvolumes are mounted (but all others seem to understand
well).

You mentioned:

quoted

/dev/loop0 on /mnt/TEST_ROOT type btrfs
(rw,relatime,compress=lzo,space_cache)  # default-subvolume
/dev/loop0 on /mnt/TEST_ROOT/root_volid0 type btrfs
(rw,relatime,compress=lzo,space_cache) # subvolid= 0
/dev/loop1 on /mnt/TEST_ROOT/backup_volid0 type btrfs
(rw,relatime,compress=lzo,space_cache)
btrfs subvolume snapshot -r /mnt/TEST_ROOT/root_volid0/root/
/mnt/TEST_ROOT/root_volid0/root_snap

Are you trying to snapshot a directory here? I.e., what is "root"
within "root_volid0"?

root is a subvolume inside the /dev/loop0 fs. It is set as the default
subvolume.
I mounted /dev/loop0 at /mnt/TEST_ROOT and inside that i mounted /dev/loop0
again,
but this time with subvolid=0. So "/mnt/TEST_ROOT/root_volid0/root" is
actually a subvolume
which is also mounted at "/mnt/TEST_ROOT".

quoted

Can you pls list all subvolumes you have on your source filesystem
(the one you are trying to backup), and where each one is mounted?
Again, looks like I'm the only one confused about this, so apologies.

You can also possibly use the "tree" utility to better visualize your
fs tree, like:
tree -A  --inodes --noreport /mnt/TEST_ROOT

Jan, David, hope it's ok with you if I'll try to debug this.

Thanks,
Alex.

I'm kinda in a hurry now because i'm leaving for Holidays soon and i still
have to finish my bachelor thesis :P

I hope with the the commands from the pastebin you have everything you need.
I can answer emails until Friday morning.

Regards,

Robert

quoted

On Sat, Aug 25, 2012 at 11:24 AM, Robert Buhren [off-list ref]
wrote:

quoted

On 24.08.2012 15:33, David Sterba wrote:

quoted

On Thu, Aug 23, 2012 at 10:54:54AM +0200, Robert Buhren wrote:

quoted

I'm on linux-3.6-rc2 and btrfs-progs from git.

Please try it with Chris' for-linus branch, it contains a fair portion
of send-related fixes and from brief look they may be related to the
errors you see.

david

Hi David,

i just tried it with a kernel from the "for-linus" branch. But i still
get
the same error.
Just to be sure:
You ment this branch:

http://git.kernel.org/?p=linux/kernel/git/mason/linux-btrfs.git;a=shortlog;h=refs/heads/for-linus

right?


Regards,

Robert

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