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Btrfs-progs: avoid using btrfs internal subvolume path to send

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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 <tom@sharkbay.at>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong 2013-11-30 00:37:25 +08:00 committed by Chris Mason
parent f053be8082
commit 8d68cb2bad
1 changed files with 6 additions and 28 deletions
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34
cmds-send.c
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@ -282,31 +282,21 @@ out:
return ERR_PTR(ret);
}
static int do_send(struct btrfs_send *send, u64 root_id, u64 parent_root_id,
int is_first_subvol, int is_last_subvol)
static int do_send(struct btrfs_send *send, u64 parent_root_id,
int is_first_subvol, int is_last_subvol, char *subvol)
{
int ret;
pthread_t t_read;
pthread_attr_t t_attr;
struct btrfs_ioctl_send_args io_send;
struct subvol_info *si;
void *t_err = NULL;
int subvol_fd = -1;
int pipefd[2] = {-1, -1};
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;
}
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;
}
@ -385,10 +375,6 @@ out:
close(pipefd[0]);
if (pipefd[1] != -1)
close(pipefd[1]);
if (si) {
free(si->path);
free(si);
}
return ret;
}
@ -664,14 +650,6 @@ int cmd_send(int argc, char **argv)
goto out;
}
ret = get_root_id(&send, get_subvol_name(send.root_path, subvol),
&root_id);
if (ret < 0) {
fprintf(stderr, "ERROR: could not resolve root_id "
"for %s\n", subvol);
goto out;
}
if (!full_send && !parent_root_id) {
ret = find_good_parent(&send, root_id, &parent_root_id);
if (ret < 0) {
@ -700,8 +678,8 @@ int cmd_send(int argc, char **argv)
is_first_subvol = 1;
is_last_subvol = 1;
}
ret = do_send(&send, root_id, parent_root_id,
is_first_subvol, is_last_subvol);
ret = do_send(&send, parent_root_id, is_first_subvol,
is_last_subvol, subvol);
if (ret < 0)
goto out;