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| author | Paul Clements <paul.clements@steeleye.com> | 2006-12-06 20:40:53 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:47 -0800 |
| commit | 6b39bb6548d60b9a18826134b5ccd5c3cef85fe2 (patch) | |
| tree | 8521d13c8518d4baa0ecfe2f1031524edb47d4d9 /drivers/block | |
| parent | 792908225064b1d841a8990b9d1d1cfc4e0e5bb2 (diff) | |
| download | lwn-6b39bb6548d60b9a18826134b5ccd5c3cef85fe2.tar.gz lwn-6b39bb6548d60b9a18826134b5ccd5c3cef85fe2.zip | |
[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')
| -rw-r--r-- | drivers/block/nbd.c | 16 |
1 files changed, 16 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; } |