diff options
| -rw-r--r-- | drivers/block/nbd.c | 16 | ||||
| -rw-r--r-- | include/linux/nbd.h | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 9d1035e8d9d8..7bf2cfbd6285 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -355,14 +355,30 @@ harderror: return NULL; } +static ssize_t pid_show(struct gendisk *disk, char *page) +{ + return sprintf(page, "%ld\n", + (long) ((struct nbd_device *)disk->private_data)->pid); +} + +static struct disk_attribute pid_attr = { + .attr = { .name = "pid", .mode = S_IRUGO }, + .show = pid_show, +}; + static void nbd_do_it(struct nbd_device *lo) { struct request *req; BUG_ON(lo->magic != LO_MAGIC); + lo->pid = current->pid; + sysfs_create_file(&lo->disk->kobj, &pid_attr.attr); + while ((req = nbd_read_stat(lo)) != NULL) nbd_end_request(req); + + sysfs_remove_file(&lo->disk->kobj, &pid_attr.attr); return; } diff --git a/include/linux/nbd.h b/include/linux/nbd.h index d6b6dc09ad97..0f3e69302540 100644 --- a/include/linux/nbd.h +++ b/include/linux/nbd.h @@ -64,6 +64,7 @@ struct nbd_device { struct gendisk *disk; int blksize; u64 bytesize; + pid_t pid; /* pid of nbd-client, if attached */ }; #endif |