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core: retry unmounting until we are done, in case of stacked mounts

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This commit is contained in:
Lennart Poettering 2014-12-12 20:12:35 +01:00
parent b1acce80cd
commit 7d54a03a87
2 changed files with 41 additions and 7 deletions
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46
src/core/mount.c
View File

@ -45,6 +45,8 @@
#include "exit-status.h"
#include "def.h"
#define RETRY_UMOUNT_MAX 32
DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_table*, mnt_free_table);
DEFINE_TRIVIAL_CLEANUP_FUNC(struct libmnt_iter*, mnt_free_iter);
@ -867,20 +869,28 @@ static void mount_enter_unmounting(Mount *m) {
assert(m);
/* Start counting our attempts */
if (!IN_SET(m->state,
MOUNT_UNMOUNTING,
MOUNT_UNMOUNTING_SIGTERM,
MOUNT_UNMOUNTING_SIGKILL))
m->n_retry_umount = 0;
m->control_command_id = MOUNT_EXEC_UNMOUNT;
m->control_command = m->exec_command + MOUNT_EXEC_UNMOUNT;
if ((r = exec_command_set(
m->control_command,
r = exec_command_set(m->control_command,
"/bin/umount",
"-n",
m->where,
NULL)) < 0)
NULL);
if (r < 0)
goto fail;
mount_unwatch_control_pid(m);
if ((r = mount_spawn(m, m->control_command, &m->control_pid)) < 0)
r = mount_spawn(m, m->control_command, &m->control_pid);
if (r < 0)
goto fail;
mount_set_state(m, MOUNT_UNMOUNTING);
@ -1239,9 +1249,31 @@ static void mount_sigchld_event(Unit *u, pid_t pid, int code, int status) {
case MOUNT_UNMOUNTING_SIGKILL:
case MOUNT_UNMOUNTING_SIGTERM:
if (f == MOUNT_SUCCESS)
mount_enter_dead(m, f);
else if (m->from_proc_self_mountinfo)
if (f == MOUNT_SUCCESS) {
if (m->from_proc_self_mountinfo) {
/* Still a mount point? If so, let's
* try again. Most likely there were
* multiple mount points stacked on
* top of each other. Note that due to
* the io event priority logic we can
* be sure the new mountinfo is loaded
* before we process the SIGCHLD for
* the mount command. */
if (m->n_retry_umount < RETRY_UMOUNT_MAX) {
log_unit_debug(u->id, "%s: mount still present, trying again.", u->id);
m->n_retry_umount++;
mount_enter_unmounting(m);
} else {
log_unit_debug(u->id, "%s: mount still present after %u attempts to unmount, giving up.", u->id, m->n_retry_umount);
mount_enter_mounted(m, f);
}
} else
mount_enter_dead(m, f);
} else if (m->from_proc_self_mountinfo)
mount_enter_mounted(m, f);
else
mount_enter_dead(m, f);

2
src/core/mount.h
View File

@ -112,6 +112,8 @@ struct Mount {
pid_t control_pid;
sd_event_source *timer_event_source;
unsigned n_retry_umount;
};
extern const UnitVTable mount_vtable;