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IPC: restore semaphores sets

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Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Kinsbursky Stanislav 2012-02-14 19:54:20 +03:00 • committed by Cyrill Gorcunov
parent 4101487f87
commit f086010abd
1 changed files with 108 additions and 0 deletions
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108
ipc_ns.c
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@ -47,6 +47,10 @@ struct msgbuf_a {
#define MSG_SET 13
#endif
#ifndef SEM_SET
#define SEM_SET 20
#endif
static void print_ipc_desc_entry(const struct ipc_desc_entry *desc)
{
pr_info("id: %-10d key: 0x%08x ", desc->id, desc->key);
@ -549,6 +553,107 @@ void show_ipc_var(int fd)
pr_img_tail(CR_FD_IPCNS);
}
static int prepare_ipc_sem_values(int fd, const struct ipc_sem_entry *entry)
{
int ret, size;
u16 *values;
size = sizeof(u16) * entry->nsems;
values = xmalloc(size);
if (values == NULL) {
pr_err("Failed to allocate memory for semaphores set values\n");
ret = -ENOMEM;
goto out;
}
ret = read_img_buf(fd, values, round_up(size, sizeof(u64)));
if (ret < 0) {
pr_err("Failed to allocate memory for semaphores set values\n");
ret = -ENOMEM;
goto out;
}
print_ipc_sem_array(entry->nsems, values);
ret = semctl(entry->desc.id, 0, SETALL, values);
if (ret < 0) {
pr_perror("Failed to set semaphores set values");
ret = -errno;
}
out:
xfree(values);
return ret;
}
static int prepare_ipc_sem_desc(int fd, const struct ipc_sem_entry *entry)
{
int ret, id;
struct semid_ds ds;
id = semget(entry->desc.id, entry->nsems,
entry->desc.mode | IPC_CREAT | IPC_EXCL | IPC_PRESET);
if (id == -1) {
pr_perror("Failed to create sem set");
return -errno;
}
if (id != entry->desc.id) {
pr_err("Failed to preset id (%d instead of %d)\n",
id, entry->desc.id);
return -EFAULT;
}
ret = semctl(id, 0, SEM_STAT, &ds);
if (ret < 0) {
pr_perror("Failed to stat sem set");
return -errno;
}
ds.sem_perm.KEY = entry->desc.key;
ret = semctl(id, 0, SEM_SET, &ds);
if (ret < 0) {
pr_perror("Failed to update sem key");
return -errno;
}
ret = prepare_ipc_sem_values(fd, entry);
if (ret < 0) {
pr_err("Failed to update sem pages\n");
return ret;
}
return 0;
}
static int prepare_ipc_sem(int pid)
{
int fd;
pr_info("Restoring IPC semaphores sets\n");
fd = open_image_ro(CR_FD_IPCNS_SEM, pid);
if (fd < 0)
return -1;
while (1) {
int ret, id;
struct ipc_sem_entry entry;
struct semid_ds ds;
ret = read_img_eof(fd, &entry);
if (ret < 0)
return -EIO;
if (ret == 0)
break;
print_ipc_sem_entry(&entry);
ret = prepare_ipc_sem_desc(fd, &entry);
if (ret < 0) {
pr_err("Failed to prepare semaphores set\n");
return ret;
}
}
return 0;
}
static int prepare_ipc_msg_queue_messages(int fd, const struct ipc_msg_entry *entry)
{
int msg_nr = 0;
@ -787,6 +892,9 @@ int prepare_ipc_ns(int pid)
if (ret < 0)
return ret;
ret = prepare_ipc_msg(pid);
if (ret < 0)
return ret;
ret = prepare_ipc_sem(pid);
if (ret < 0)
return ret;
return 0;