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authorMarkus Pargmann <mpa@pengutronix.de>2015-08-17 08:20:03 +0200
committerJens Axboe <axboe@fb.com>2015-08-17 08:22:52 -0600
commit193918307f4e66eb6a811f30795991c6f7680b34 (patch)
tree8b770dd24764fcb54f9cf0a7eea1d7bad0d63b83 /drivers/block/nbd.c
parent260bbce403e2ac601b422fd926f48b9924051f92 (diff)
downloadlinux-193918307f4e66eb6a811f30795991c6f7680b34.tar.bz2
nbd: Remove 'harderror' and propagate error properly
Instead of a variable 'harderror' we can simply try to correctly propagate errors to the userspace. This patch removes the harderror variable and passes errors through error pointers and nbd_do_it back to the userspace. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/nbd.c')
-rw-r--r--drivers/block/nbd.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 137b45f7f6c6..4b317aef3ece 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -41,7 +41,6 @@
struct nbd_device {
int flags;
- int harderror; /* Code of hard error */
struct socket * sock; /* If == NULL, device is not ready, yet */
int magic;
@@ -329,26 +328,24 @@ static struct request *nbd_read_stat(struct nbd_device *nbd)
if (result <= 0) {
dev_err(disk_to_dev(nbd->disk),
"Receive control failed (result %d)\n", result);
- goto harderror;
+ return ERR_PTR(result);
}
if (ntohl(reply.magic) != NBD_REPLY_MAGIC) {
dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n",
(unsigned long)ntohl(reply.magic));
- result = -EPROTO;
- goto harderror;
+ return ERR_PTR(-EPROTO);
}
req = nbd_find_request(nbd, *(struct request **)reply.handle);
if (IS_ERR(req)) {
result = PTR_ERR(req);
if (result != -ENOENT)
- goto harderror;
+ return ERR_PTR(result);
dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%p)\n",
reply.handle);
- result = -EBADR;
- goto harderror;
+ return ERR_PTR(-EBADR);
}
if (ntohl(reply.error)) {
@@ -376,9 +373,6 @@ static struct request *nbd_read_stat(struct nbd_device *nbd)
}
}
return req;
-harderror:
- nbd->harderror = result;
- return NULL;
}
static ssize_t pid_show(struct device *dev,
@@ -413,8 +407,15 @@ static int nbd_do_it(struct nbd_device *nbd)
nbd->task_recv = current;
- while ((req = nbd_read_stat(nbd)) != NULL)
+ while (1) {
+ req = nbd_read_stat(nbd);
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ break;
+ }
+
nbd_end_request(nbd, req);
+ }
nbd->task_recv = NULL;
@@ -734,8 +735,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
kthread_stop(thread);
mutex_lock(&nbd->tx_lock);
- if (error)
- return error;
+
sock_shutdown(nbd);
sock = nbd->sock;
nbd->sock = NULL;
@@ -754,7 +754,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
blkdev_reread_part(bdev);
if (nbd->disconnect) /* user requested, ignore socket errors */
return 0;
- return nbd->harderror;
+ return error;
}
case NBD_CLEAR_QUE: