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block/nfs: Implement bdrv_dirname()

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While the basic idea is obvious and could be handled by the default
bdrv_dirname() implementation, we cannot generate a directory name if
the gid or uid are set, so we have to explicitly return NULL in those
cases.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-id: 20190201192935.18394-19-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-02-01 20:29:22 +01:00
parent 8a6239c071
commit 0dcbc54a95
1 changed files with 15 additions and 0 deletions
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15
block/nfs.c
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@ -855,6 +855,20 @@ static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
static char *nfs_dirname(BlockDriverState *bs, Error **errp)
{
NFSClient *client = bs->opaque;
if (client->uid || client->gid) {
bdrv_refresh_filename(bs);
error_setg(errp, "Cannot generate a base directory for NFS node '%s'",
bs->filename);
return NULL;
}
return g_strdup_printf("nfs://%s%s/", client->server->host, client->path);
}
#ifdef LIBNFS_FEATURE_PAGECACHE
static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
Error **errp)
@ -889,6 +903,7 @@ static BlockDriver bdrv_nfs = {
.bdrv_detach_aio_context = nfs_detach_aio_context,
.bdrv_attach_aio_context = nfs_attach_aio_context,
.bdrv_refresh_filename = nfs_refresh_filename,
.bdrv_dirname = nfs_dirname,
#ifdef LIBNFS_FEATURE_PAGECACHE
.bdrv_co_invalidate_cache = nfs_co_invalidate_cache,