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nbd/server: Use real permissions for NBD exports 

NBD can't cope with device size changes, so resize must be forbidden,
but otherwise we can tolerate anything. Depending on whether the export
is writable or not, we only require consistent reads and writes.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
master
Kevin Wolf 2017-02-09 15:43:38 +01:00
parent 6f5ef23a3f
commit 8a7ce4f933
1 changed files with 9 additions and 2 deletions
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11
nbd/server.c
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@ -891,10 +891,17 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset, off_t size,
{
BlockBackend *blk;
NBDExport *exp = g_malloc0(sizeof(NBDExport));
uint64_t perm;
int ret;
/* FIXME Use real permissions */
blk = blk_new(0, BLK_PERM_ALL);
/* Don't allow resize while the NBD server is running, otherwise we don't
* care what happens with the node. */
perm = BLK_PERM_CONSISTENT_READ;
if ((nbdflags & NBD_FLAG_READ_ONLY) == 0) {
perm |= BLK_PERM_WRITE;
}
blk = blk_new(perm, BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
BLK_PERM_WRITE | BLK_PERM_GRAPH_MOD);
ret = blk_insert_bs(blk, bs, errp);
if (ret < 0) {
goto fail;