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[PATCH] nbd: show nbd client pid in sysfs

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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>
This commit is contained in:
Paul Clements
2006-12-06 20:40:53 -08:00
committed by Linus Torvalds
parent 7929082250
commit 6b39bb6548
2 changed files with 17 additions and 0 deletions
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16
drivers/block/nbd.c
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@@ -355,14 +355,30 @@ harderror:
return NULL; 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) static void nbd_do_it(struct nbd_device *lo)
{ {
struct request *req; struct request *req;
BUG_ON(lo->magic != LO_MAGIC); 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) while ((req = nbd_read_stat(lo)) != NULL)
nbd_end_request(req); nbd_end_request(req);
sysfs_remove_file(&lo->disk->kobj, &pid_attr.attr);
return; return;
} }

1
include/linux/nbd.h
View File

@@ -64,6 +64,7 @@ struct nbd_device {
struct gendisk *disk; struct gendisk *disk;
int blksize; int blksize;
u64 bytesize; u64 bytesize;
pid_t pid; /* pid of nbd-client, if attached */
}; };
#endif #endif