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

From: Gabriel de Perthuis
Subject: [Qemu-devel] [PATCH] 9p: Be robust against paths without FS_IOC_GETVERSION
Date: Thu, 09 May 2013 01:49:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130404 Thunderbird/17.0.5

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 <address@hidden>
 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 
                     err = -errno;
+    /* 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)

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