43 lines
1.5 KiB
Diff
43 lines
1.5 KiB
Diff
|
From 5ba99e361671bc22bfc3ce45d866826f297e25b7 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Gabriel de Perthuis <g2p.code@gmail.com>
|
||
|
|
Date: Fri, 10 May 2013 19:53:28 +0200
|
||
|
|
Subject: [PATCH] hw/9pfs: Be robust against paths without FS_IOC_GETVERSION
|
||
|
|
|
||
|
|
9P optionally uses the FS_IOC_GETVERSION ioctl to get information about
|
||
|
|
a file's version (sometimes called generation number).
|
||
|
|
|
||
|
|
The code checks for supported filesystems at mount time, but some paths
|
||
|
|
may come from other mounted filesystems.
|
||
|
|
|
||
|
|
Change it to treat unsupported paths the same as unsupported
|
||
|
|
filesystems, returning 0 in both cases.
|
||
|
|
|
||
|
|
Note: ENOTTY is the error code for an unsupported ioctl.
|
||
|
|
|
||
|
|
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>
|
||
|
|
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
|
||
|
|
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
|
||
|
|
(cherry picked from commit db431f6adc881a0758512cd765b3108209013512)
|
||
|
|
---
|
||
|
|
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
|
||
|
|
@@ -38,6 +38,10 @@ int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t st_mode,
|
||
|
|
});
|
||
|
|
v9fs_path_unlock(s);
|
||
|
|
}
|
||
|
|
+ /* The ioctl may not be supported depending on the path */
|
||
|
|
+ if (err == -ENOTTY) {
|
||
|
|
+ err = 0;
|
||
|
|
+ }
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|