mir/criu
2
0
Fork 0
mirror of https://github.com/checkpoint-restore/criu synced 2025-08-30 22:05:36 +00:00
Code Issues Releases Wiki Activity

mount: show more info about why we can't mount

Browse Source 
Currently if we have mount deadlock it is hard to understand which
mounts lock each other, these makes it easier.

Cherry-picked from Virtuozzo criu:
https://src.openvz.org/projects/OVZ/repos/criu/commits/8ba8499e2
Cherry-picked from Virtuozzo criu:
https://src.openvz.org/projects/OVZ/repos/criu/commits/48d044ae11

Changes: merge newline fixup.

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
This commit is contained in:
Pavel Tikhomirov
2019-09-12 10:10:37 +03:00
committed by Andrei Vagin
parent 685a53eeca
commit d5cb7764e4
1 changed files with 32 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
criu/mount.c
View File

@@ -2426,8 +2426,10 @@ static bool rst_mnt_is_root(struct mount_info *m)
static bool can_mount_now(struct mount_info *mi)
{
if (rst_mnt_is_root(mi))
if (rst_mnt_is_root(mi)) {
pr_debug("%s: true as %d is mntns root\n", __func__, mi->mnt_id);
return true;
}
/* Parent should be mounted already, that's how mnt_tree_for_each works */
BUG_ON(mi->parent && !mi->parent->mounted);
@@ -2444,21 +2446,35 @@ static bool can_mount_now(struct mount_info *mi)
if (mi->mnt_master) {
struct mount_info *c, *s;
if (mi->bind == NULL)
if (mi->bind == NULL) {
pr_debug("%s: false as %d is slave with unmounted master %d\n", __func__, mi->mnt_id,
mi->mnt_master->mnt_id);
return false;
}
list_for_each_entry(c, &mi->mnt_master->children, siblings)
if (!c->mounted)
list_for_each_entry(c, &mi->mnt_master->children, siblings) {
if (!c->mounted) {
pr_debug("%s: false as %d is slave with unmounted master's children %d\n", __func__,
mi->mnt_id, c->mnt_id);
return false;
}
}
list_for_each_entry(s, &mi->mnt_master->mnt_share, mnt_share)
list_for_each_entry(c, &s->children, siblings)
if (!c->mounted)
list_for_each_entry(s, &mi->mnt_master->mnt_share, mnt_share) {
list_for_each_entry(c, &s->children, siblings) {
if (!c->mounted) {
pr_debug("%s: false as %d is slave with unmounted children of master's share\n",
__func__, mi->mnt_id);
return false;
}
}
}
}
if (!fsroot_mounted(mi) && (mi->bind == NULL && !mi->need_plugin))
if (!fsroot_mounted(mi) && (mi->bind == NULL && !mi->need_plugin)) {
pr_debug("%s: false as %d is non-root without bind or plugin\n", __func__, mi->mnt_id);
return false;
}
shared:
/* Mount only after all parents of our propagation group mounted */
@@ -2467,8 +2483,11 @@ shared:
list_for_each_entry(p, &mi->mnt_propagate, mnt_propagate) {
BUG_ON(!p->parent);
if (!p->parent->mounted)
if (!p->parent->mounted) {
pr_debug("%s: false as %d has unmounted parent %d of its propagation group\n", __func__,
mi->mnt_id, p->parent->mnt_id);
return false;
}
}
}
@@ -2515,8 +2534,11 @@ shared:
/* Check not propagated mounts mounted and cleanup list */
list_for_each_entry_safe(p, t, &mi_notprop, mnt_notprop) {
if (!p->mounted)
if (!p->mounted) {
pr_debug("%s: false as %d has unmounted 'anti'-propagation mount %d\n", __func__,
mi->mnt_id, p->mnt_id);
can = false;
}
list_del_init(&p->mnt_notprop);
}