Commit 2d4fde59 authored by Bernd Schubert's avatar Bernd Schubert Committed by Miklos Szeredi
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fuse: prevent disabling io-uring on active connections 



The enable_uring module parameter allows administrators to enable/disable
io-uring support for FUSE at runtime. However, disabling io-uring while
connections already have it enabled can lead to an inconsistent state.

Fix this by keeping io-uring enabled on connections that were already using
it, even if the module parameter is later disabled. This ensures active
FUSE mounts continue to function correctly.

Signed-off-by: default avatarBernd Schubert <bschubert@ddn.com>
Reviewed-by: default avatarLuis Henriques <luis@igalia.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@redhat.com>
parent 786412a7

fs/fuse/dev_uring.c

+6 −5
Original line number Diff line number Diff line
@@ -1091,11 +1091,6 @@ int fuse_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) 
	u32 cmd_op = cmd->cmd_op;

	int err;



	if (!enable_uring) {

		pr_info_ratelimited("fuse-io-uring is disabled\n");

		return -EOPNOTSUPP;

	}



	if ((unlikely(issue_flags & IO_URING_F_CANCEL))) {

		fuse_uring_cancel(cmd, issue_flags);

		return 0;
@@ -1112,6 +1107,12 @@ int fuse_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags) 
	}

	fc = fud->fc;



	/* Once a connection has io-uring enabled on it, it can't be disabled */

	if (!enable_uring && !fc->io_uring) {

		pr_info_ratelimited("fuse-io-uring is disabled\n");

		return -EOPNOTSUPP;

	}



	if (fc->aborted)

		return -ECONNABORTED;

	if (!fc->connected)