diff options
Diffstat (limited to 'irmap.c')
| -rw-r--r-- | irmap.c | 27 |
1 files changed, 26 insertions, 1 deletions
@@ -217,6 +217,8 @@ invalid: return 1; } +static bool doing_predump = false; + char *irmap_lookup(unsigned int s_dev, unsigned long i_ino) { struct irmap *c, *h, **p; @@ -227,7 +229,14 @@ char *irmap_lookup(unsigned int s_dev, unsigned long i_ino) pr_debug("Resolving %x:%lx path\n", s_dev, i_ino); - if (__mntns_get_root_fd(root_item->pid.real) < 0) + /* + * If we're in predump, then processes already run + * and the root_item is already freed by that time. + * But the root service fd is already set by the + * irmap_predump_prep, so we just go ahead and scan. + */ + if (!doing_predump && + __mntns_get_root_fd(root_item->pid.real) < 0) goto out; timing_start(TIME_IRMAP_RESOLVE); @@ -296,6 +305,22 @@ int irmap_queue_cache(unsigned int dev, unsigned long ino, return 0; } +int irmap_predump_prep(void) +{ + /* + * Tasks are about to get released soon, but + * we'll need to do FS scan for irmaps. In this + * scan we will need to know the root dir tasks + * live in. Need to make sure the respective fd + * (service) is set to that root, so that the + * scan works and doesn't race with the tasks + * dying or changind root. + */ + + doing_predump = true; + return __mntns_get_root_fd(root_item->pid.real) < 0 ? -1 : 0; +} + int irmap_predump_run(void) { int ret = 0, fd; |