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fuse: prevent disabling io-uring on active connections

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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: Bernd Schubert <bschubert@ddn.com>
Reviewed-by: Luis Henriques <luis@igalia.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Bernd Schubert 2025-01-23 17:55:32 +01:00 committed by Miklos Szeredi
parent 786412a73e
commit 2d4fde59fd
1 changed files with 6 additions and 5 deletions
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11
fs/fuse/dev_uring.c
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@ -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)