fsdev: improve error handling of backend init

This patch changes some error messages in the backend init code and
convert backends to propagate QEMU Error objects instead of calling
error_report().

One notable improvement is that the local backend now provides a more
detailed error report when it fails to open the shared directory.

Signed-off-by: Greg Kurz <groug@kaod.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/hw/9pfs/9p-local.c b/hw/9pfs/9p-local.c
index e1a4b84..b25c185 100644
--- a/hw/9pfs/9p-local.c
+++ b/hw/9pfs/9p-local.c
@@ -1400,13 +1400,14 @@ static int local_ioc_getversion(FsContext *ctx, V9fsPath *path,
 #endif
 }
 
-static int local_init(FsContext *ctx)
+static int local_init(FsContext *ctx, Error **errp)
 {
     struct statfs stbuf;
     LocalData *data = g_malloc(sizeof(*data));
 
     data->mountfd = open(ctx->fs_root, O_DIRECTORY | O_RDONLY);
     if (data->mountfd == -1) {
+        error_setg_errno(errp, errno, "failed to open '%s'", ctx->fs_root);
         goto err;
     }