9p: fix O_APPEND in legacy mode
The legacy protocol's open operation doesn't handle an append operation
(it is expected that the client take care of it). We were incorrectly
passing the extended protocol's flag through even in legacy mode. This
was reported in bugzilla report #10689. This patch fixes the problem
by disallowing extended protocol open modes from being passed in legacy
mode and implemented append functionality on the client side by adding
a seek after the open.
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 40fa807..c95295c 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -132,10 +132,10 @@
/**
* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
* @uflags: flags to convert
- *
+ * @extended: if .u extensions are active
*/
-int v9fs_uflags2omode(int uflags)
+int v9fs_uflags2omode(int uflags, int extended)
{
int ret;
@@ -155,14 +155,16 @@
break;
}
- if (uflags & O_EXCL)
- ret |= P9_OEXCL;
-
if (uflags & O_TRUNC)
ret |= P9_OTRUNC;
- if (uflags & O_APPEND)
- ret |= P9_OAPPEND;
+ if (extended) {
+ if (uflags & O_EXCL)
+ ret |= P9_OEXCL;
+
+ if (uflags & O_APPEND)
+ ret |= P9_OAPPEND;
+ }
return ret;
}
@@ -506,7 +508,7 @@
flags = O_RDWR;
fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
- v9fs_uflags2omode(flags));
+ v9fs_uflags2omode(flags, v9fs_extended(v9ses)));
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
fid = NULL;