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nbd: add netlink reconfigure resize support 

If the device is setup with ioctl we can resize the device after the
initial setup, but if the device is setup with netlink we cannot use the
resize related ioctls and there is no netlink reconfigure size ATTR
handling code.

This patch adds netlink reconfigure resize support to match the ioctl
interface.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Mike Christie 2019-05-29 15:16:06 -05:00 committed by Jens Axboe
parent 553768d116
commit 4ddeaae890
1 changed files with 32 additions and 16 deletions
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48
drivers/block/nbd.c
View File

@ -1684,6 +1684,30 @@ nbd_device_policy[NBD_DEVICE_ATTR_MAX + 1] = {
[NBD_DEVICE_CONNECTED] = { .type = NLA_U8 },
};
static int nbd_genl_size_set(struct genl_info *info, struct nbd_device *nbd)
{
struct nbd_config *config = nbd->config;
u64 bsize = config->blksize;
u64 bytes = config->bytesize;
if (info->attrs[NBD_ATTR_SIZE_BYTES])
bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]);
if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
bsize = nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
if (!bsize)
bsize = NBD_DEF_BLKSIZE;
if (!nbd_is_valid_blksize(bsize)) {
printk(KERN_ERR "Invalid block size %llu\n", bsize);
return -EINVAL;
}
}
if (bytes != config->bytesize || bsize != config->blksize)
nbd_size_set(nbd, bsize, div64_u64(bytes, bsize));
return 0;
}
static int nbd_genl_connect(struct sk_buff *skb, struct genl_info *info)
{
struct nbd_device *nbd = NULL;
@ -1771,22 +1795,10 @@ again:
refcount_set(&nbd->config_refs, 1);
set_bit(NBD_BOUND, &config->runtime_flags);
if (info->attrs[NBD_ATTR_SIZE_BYTES]) {
u64 bytes = nla_get_u64(info->attrs[NBD_ATTR_SIZE_BYTES]);
nbd_size_set(nbd, config->blksize,
div64_u64(bytes, config->blksize));
}
if (info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]) {
u64 bsize =
nla_get_u64(info->attrs[NBD_ATTR_BLOCK_SIZE_BYTES]);
if (!bsize)
bsize = NBD_DEF_BLKSIZE;
if (!nbd_is_valid_blksize(bsize)) {
ret = -EINVAL;
goto out;
}
nbd_size_set(nbd, bsize, div64_u64(config->bytesize, bsize));
}
ret = nbd_genl_size_set(info, nbd);
if (ret)
goto out;
if (info->attrs[NBD_ATTR_TIMEOUT]) {
u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
nbd->tag_set.timeout = timeout * HZ;
@ -1955,6 +1967,10 @@ static int nbd_genl_reconfigure(struct sk_buff *skb, struct genl_info *info)
goto out;
}
ret = nbd_genl_size_set(info, nbd);
if (ret)
goto out;
if (info->attrs[NBD_ATTR_TIMEOUT]) {
u64 timeout = nla_get_u64(info->attrs[NBD_ATTR_TIMEOUT]);
nbd->tag_set.timeout = timeout * HZ;