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authorPaul Clements <paul.clements@steeleye.com>2006-12-06 20:40:53 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 08:39:47 -0800
commit6b39bb6548d60b9a18826134b5ccd5c3cef85fe2 (patch)
tree8521d13c8518d4baa0ecfe2f1031524edb47d4d9 /drivers/block/nbd.c
parent792908225064b1d841a8990b9d1d1cfc4e0e5bb2 (diff)
[PATCH] nbd: show nbd client pid in sysfs
Allow nbd to expose the nbd-client daemon's PID in /sys/block/nbd<x>/pid. This is helpful for tracking connection status of a device and for determining which nbd devices are currently in use. Signed-off-by: Paul Clements <paul.clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/block/nbd.c')
-rw-r--r--drivers/block/nbd.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 9d1035e8d9d..7bf2cfbd628 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;
}