On Fri, 29 Nov 2013 22:23:09 +0800, Wang Shilong wrote:
> From: Wang Shilong <wangsl.f...@cn.fujitsu.com>
>
> Steps to reproduce:
> # mkfs.btrfs -f /dev/sda
> # mount /dev/sda /mnt
> # btrfs subvolume create /mnt/foo
> # umount /mnt
> # mount -o subvol=foo /dev/sda /mnt
> # btrfs sub snapshot -r /mnt /mnt/snap
> # btrfs send /mnt/snap > /dev/null
>
> We will fail to send '/mnt/snap',this is because btrfs send try to
> open '/mnt/snap' by btrfs internal subvolume path 'foo/snap' rather
> than relative path based on mounted point, this will return us 'no
> such file or directory',this is not right, fix it.
>
> Reported-by: Thomas Scheiblauer <t...@sharkbay.at>
> Signed-off-by: Wang Shilong <wangsl.f...@cn.fujitsu.com>
> ---
> cmds-send.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/cmds-send.c b/cmds-send.c
> index 53e9a53..b3dde83 100644
> --- a/cmds-send.c
> +++ b/cmds-send.c
> @@ -283,7 +283,7 @@ out:
> }
>
> static int do_send(struct btrfs_send *send, u64 root_id, u64 parent_root_id,
> - int is_first_subvol, int is_last_subvol)
> + int is_first_subvol, int is_last_subvol, char *subvol)
> {
> int ret;
> pthread_t t_read;
> @@ -303,10 +303,10 @@ static int do_send(struct btrfs_send *send, u64
> root_id, u64 parent_root_id,
> goto out;
> }
>
> - subvol_fd = openat(send->mnt_fd, si->path, O_RDONLY | O_NOATIME);
> + subvol_fd = openat(send->mnt_fd, subvol, O_RDONLY | O_NOATIME);
> if (subvol_fd < 0) {
> ret = -errno;
> - fprintf(stderr, "ERROR: open %s failed. %s\n", si->path,
> + fprintf(stderr, "ERROR: open %s failed. %s\n", subvol,
> strerror(-ret));
> goto out;
> }
> @@ -701,7 +701,7 @@ int cmd_send(int argc, char **argv)
> is_last_subvol = 1;
> }
> ret = do_send(&send, root_id, parent_root_id,
> - is_first_subvol, is_last_subvol);
> + is_first_subvol, is_last_subvol, subvol);
> if (ret < 0)
> goto out;
>
>
You've removed that the subvol_info si is used in do_send().
Then you can remove all the subvol_info si code:
struct subvol_info *si;
...
si = subvol_uuid_search(&send->sus, root_id, NULL, 0, NULL,
subvol_search_by_root_id);
if (!si) {
ret = -ENOENT;
fprintf(stderr, "ERROR: could not find subvol info for
%llu",
root_id);
goto out;
}
...
if (si) {
free(si->path);
free(si);
}
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