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Subject[PATCH v2 3/4] nbd: Cleanup reset of nbd and bdev after a disconnect
Date
Group all variables that are reset after a disconnect into reset
functions. This patch adds two of these functions, nbd_reset() and
nbd_bdev_reset().

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
drivers/block/nbd.c | 40 +++++++++++++++++++++++++++++-----------
1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 0ba3149c48bb..a1fa356e4cbf 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -617,6 +617,30 @@ out:
return ret;
}

+/* Reset all properties of an NBD device */
+static void nbd_reset(struct nbd_device *nbd)
+{
+ nbd->disconnect = false;
+ nbd->timedout = false;
+ nbd->blksize = 1024;
+ nbd->bytesize = 0;
+ set_capacity(nbd->disk, 0);
+ nbd->flags = 0;
+ nbd->xmit_timeout = 0;
+ queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue);
+ del_timer_sync(&nbd->timeout_timer);
+}
+
+static void nbd_bdev_reset(struct block_device *bdev)
+{
+ set_device_ro(bdev, false);
+ bdev->bd_inode->i_size = 0;
+ if (max_part > 0) {
+ blkdev_reread_part(bdev);
+ bdev->bd_invalidated = 1;
+ }
+}
+
static int nbd_dev_dbg_init(struct nbd_device *nbd);
static void nbd_dev_dbg_close(struct nbd_device *nbd);

@@ -745,19 +769,15 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd,
sock_shutdown(nbd);
nbd_clear_que(nbd);
kill_bdev(bdev);
- queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue);
- set_device_ro(bdev, false);
- nbd->flags = 0;
- nbd->bytesize = 0;
- bdev->bd_inode->i_size = 0;
- set_capacity(nbd->disk, 0);
- if (max_part > 0)
- blkdev_reread_part(bdev);
+ nbd_bdev_reset(bdev);
+
if (nbd->disconnect) /* user requested, ignore socket errors */
error = 0;
if (nbd->timedout)
error = -ETIMEDOUT;

+ nbd_reset(nbd);
+
return error;
}

@@ -1024,14 +1044,12 @@ static int __init nbd_init(void)
nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i];
init_waitqueue_head(&nbd_dev[i].active_wq);
init_waitqueue_head(&nbd_dev[i].waiting_wq);
- nbd_dev[i].blksize = 1024;
- nbd_dev[i].bytesize = 0;
disk->major = NBD_MAJOR;
disk->first_minor = i << part_shift;
disk->fops = &nbd_fops;
disk->private_data = &nbd_dev[i];
sprintf(disk->disk_name, "nbd%d", i);
- set_capacity(disk, 0);
+ nbd_reset(&nbd_dev[i]);
add_disk(disk);
}

--
2.6.2


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