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copy_storage: try to use snapshot for btrfs

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Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Serge Hallyn 2016-01-11 13:07:05 -08:00
parent c7ec3de825
commit 15a90a10d9
1 changed files with 22 additions and 0 deletions
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22
src/lxc/lxccontainer.c
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@ -41,6 +41,7 @@
#include "attach.h"
#include "bdev/bdev.h"
#include "bdev/lxcoverlay.h"
#include "bdev/lxcbtrfs.h"
#include "cgroup.h"
#include "conf.h"
#include "config.h"
@ -2817,12 +2818,33 @@ static bool add_rdepends(struct lxc_container *c, struct lxc_container *c0)
return bret;
}
/*
* If the fs natively supports snapshot clones with no penalty,
* then default to those even if not requested.
* Currently we only do this for btrfs.
*/
bool should_default_to_snapshot(struct lxc_container *c0,
struct lxc_container *c1)
{
size_t l0 = strlen(c0->config_path) + strlen(c0->name) + 2;
size_t l1 = strlen(c1->config_path) + strlen(c1->name) + 2;
char *p0 = alloca(l0 + 1);
char *p1 = alloca(l1 + 1);
snprintf(p0, l0, "%s/%s", c0->config_path, c0->name);
snprintf(p1, l1, "%s/%s", c1->config_path, c1->name);
return btrfs_same_fs(p0, p1) == 0;
}
static int copy_storage(struct lxc_container *c0, struct lxc_container *c,
const char *newtype, int flags, const char *bdevdata, uint64_t newsize)
{
struct bdev *bdev;
int need_rdep;
if (should_default_to_snapshot(c0, c))
flags |= LXC_CLONE_SNAPSHOT;
bdev = bdev_copy(c0, c->name, c->config_path, newtype, flags,
bdevdata, newsize, &need_rdep);
if (!bdev) {