linux-kernel - [PATCH] afs: Fix the fallback handling for the YFS.RemoveFile2 RPC call

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Message-ID: <109541.1736865963@warthog.procyon.org.uk>
Date: Tue, 14 Jan 2025 14:46:03 +0000
From: David Howells <dhowells@...hat.com>
To: Marc Dionne <marc.dionne@...istor.com>
cc: dhowells@...hat.com, Christian Brauner <brauner@...nel.org>,
    linux-afs@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
    linux-kernel@...r.kernel.org
Subject: [PATCH] afs: Fix the fallback handling for the YFS.RemoveFile2 RPC call

Fix a pair of bugs in the fallback handling for the YFS.RemoveFile2 RPC
call:

 (1) Fix the abort code check to also look for RXGEN_OPCODE.  The lack of
     this masks the second bug.

 (2) call->server is now not used for ordinary filesystem RPC calls that
     have an operation descriptor.  Fix to use call->op->server instead.

Fixes: e49c7b2f6de7 ("afs: Build an abstraction around an "operation" concept")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
---
 fs/afs/yfsclient.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index 024227aba4cd..362845f9aaae 100644
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -666,8 +666,9 @@ static int yfs_deliver_fs_remove_file2(struct afs_call *call)
 static void yfs_done_fs_remove_file2(struct afs_call *call)
 {
 	if (call->error == -ECONNABORTED &&
-	    call->abort_code == RX_INVALID_OPERATION) {
-		set_bit(AFS_SERVER_FL_NO_RM2, &call->server->flags);
+	    (call->abort_code == RX_INVALID_OPERATION ||
+	     call->abort_code == RXGEN_OPCODE)) {
+		set_bit(AFS_SERVER_FL_NO_RM2, &call->op->server->flags);
 		call->op->flags |= AFS_OPERATION_DOWNGRADE;
 	}
 }