[Qemu-devel] [PATCH] 9p: Be robust against paths without FS_IOC_GETVERSION

[Gabriel de Perthuis <g2p.code@gmail.com>]

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The current implementation checked for supported filesystems at mount
time, but actual support depends on the path.  Don't error out when
finding unversioned paths.

This fix allows booting a linux kernel with the same / filesystem as the
host; otherwise the boot fails when mounting devtmpfs.

Signed-off-by: Gabriel de Perthuis <g2p.code@gmail.com>
---
 hw/9pfs/cofile.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/9pfs/cofile.c b/hw/9pfs/cofile.c
index 2efebf3..194c130 100644
--- a/hw/9pfs/cofile.c
+++ b/hw/9pfs/cofile.c
@@ -36,10 +36,14 @@ int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode,
                     err = -errno;
                 }
             });
         v9fs_path_unlock(s);
     }
+    /* The ioctl may not be supported depending on the path */
+    if (err == -ENOTTY) {
+        err = 0;
+    }
     return err;
 }
 
 int v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *stbuf)
 {
-- 
1.8.2.1.419.ga0b97c6


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