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nbd: Cleanup reset of nbd and bdev after a disconnect 

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>
This commit is contained in:
Markus Pargmann 2015-10-29 12:04:51 +01:00
parent 1f7b5cf1be
commit 0e4f0f6f63
1 changed files with 29 additions and 11 deletions
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40
drivers/block/nbd.c
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@ -617,6 +617,30 @@ out:
return ret; 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 int nbd_dev_dbg_init(struct nbd_device *nbd);
static void nbd_dev_dbg_close(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); sock_shutdown(nbd);
nbd_clear_que(nbd); nbd_clear_que(nbd);
kill_bdev(bdev); kill_bdev(bdev);
queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); nbd_bdev_reset(bdev);
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);
if (nbd->disconnect) /* user requested, ignore socket errors */ if (nbd->disconnect) /* user requested, ignore socket errors */
error = 0; error = 0;
if (nbd->timedout) if (nbd->timedout)
error = -ETIMEDOUT; error = -ETIMEDOUT;
nbd_reset(nbd);
return error; return error;
} }
@ -1023,14 +1043,12 @@ static int __init nbd_init(void)
nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i]; 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].active_wq);
init_waitqueue_head(&nbd_dev[i].waiting_wq); init_waitqueue_head(&nbd_dev[i].waiting_wq);
nbd_dev[i].blksize = 1024;
nbd_dev[i].bytesize = 0;
disk->major = NBD_MAJOR; disk->major = NBD_MAJOR;
disk->first_minor = i << part_shift; disk->first_minor = i << part_shift;
disk->fops = &nbd_fops; disk->fops = &nbd_fops;
disk->private_data = &nbd_dev[i]; disk->private_data = &nbd_dev[i];
sprintf(disk->disk_name, "nbd%d", i); sprintf(disk->disk_name, "nbd%d", i);
set_capacity(disk, 0); nbd_reset(&nbd_dev[i]);
add_disk(disk); add_disk(disk);
} }