64 lines
2.7 KiB
Diff
64 lines
2.7 KiB
Diff
|
From 1da951c4c3b4e403a6c1668a54e6264381c0003d Mon Sep 17 00:00:00 2001
|
||
|
|
From: Vivek Goyal <vgoyal@redhat.com>
|
||
|
|
Date: Tue, 8 Feb 2022 15:48:04 -0500
|
||
|
|
Subject: [PATCH 1/3] virtiofsd: Fix breakage due to fuse_init_in size change
|
||
|
|
|
||
|
|
RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
||
|
|
RH-MergeRequest: 193: virtiofsd: Fix breakage due to fuse_init_in size change
|
||
|
|
RH-Commit: [1/1] 5809db034f9361fb462181d71e7cdde1324f8e54
|
||
|
|
RH-Bugzilla: 2097209
|
||
|
|
RH-Acked-by: German Maglione <None>
|
||
|
|
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
|
||
|
|
RH-Acked-by: Vivek Goyal <None>
|
||
|
|
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
||
|
|
|
||
|
|
Kernel version 5.17 has increased the size of "struct fuse_init_in" struct.
|
||
|
|
Previously this struct was 16 bytes and now it has been extended to
|
||
|
|
64 bytes in size.
|
||
|
|
|
||
|
|
Once qemu headers are updated to latest, it will expect to receive 64 byte
|
||
|
|
size struct (for protocol version major 7 and minor > 6). But if guest is
|
||
|
|
booting older kernel (older than 5.17), then it still sends older
|
||
|
|
fuse_init_in of size 16 bytes. And do_init() fails. It is expecting
|
||
|
|
64 byte struct. And this results in mount of virtiofs failing.
|
||
|
|
|
||
|
|
Fix this by parsing 16 bytes only for now. Separate patches will be
|
||
|
|
posted which will parse rest of the bytes and enable new functionality.
|
||
|
|
Right now we don't support any of the new functionality, so we don't
|
||
|
|
lose anything by not parsing bytes beyond 16.
|
||
|
|
|
||
|
|
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
||
|
|
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
|
||
|
|
Message-Id: <20220208204813.682906-2-vgoyal@redhat.com>
|
||
|
|
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
||
|
|
(cherry picked from commit a086d54c6ffa38f7e71f182b63a25315304a3392)
|
||
|
|
---
|
||
|
|
tools/virtiofsd/fuse_lowlevel.c | 4 +++-
|
||
|
|
1 file changed, 3 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c
|
||
|
|
index e4679c73ab..5d431a7038 100644
|
||
|
|
--- a/tools/virtiofsd/fuse_lowlevel.c
|
||
|
|
+++ b/tools/virtiofsd/fuse_lowlevel.c
|
||
|
|
@@ -1880,6 +1880,8 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid,
|
||
|
|
struct fuse_mbuf_iter *iter)
|
||
|
|
{
|
||
|
|
size_t compat_size = offsetof(struct fuse_init_in, max_readahead);
|
||
|
|
+ size_t compat2_size = offsetof(struct fuse_init_in, flags) +
|
||
|
|
+ sizeof(uint32_t);
|
||
|
|
struct fuse_init_in *arg;
|
||
|
|
struct fuse_init_out outarg;
|
||
|
|
struct fuse_session *se = req->se;
|
||
|
|
@@ -1897,7 +1899,7 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid,
|
||
|
|
|
||
|
|
/* ...and now consume the new fields. */
|
||
|
|
if (arg->major == 7 && arg->minor >= 6) {
|
||
|
|
- if (!fuse_mbuf_iter_advance(iter, sizeof(*arg) - compat_size)) {
|
||
|
|
+ if (!fuse_mbuf_iter_advance(iter, compat2_size - compat_size)) {
|
||
|
|
fuse_reply_err(req, EINVAL);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
--
|
||
|
|
2.35.3
|
||
|
|
|