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[ Upstream commit 0a7e54c1959c0feb2de23397ec09c7692364313e ] When an anonymous fd is closed by user daemon, if there is a new read request for this file comes up, the anonymous fd should be re-opened to handle that read request rather than fail it directly. 1. Introduce reopening state for objects that are closed but have inflight/subsequent read requests. 2. No longer flush READ requests but only CLOSE requests when anonymous fd is closed. 3. Enqueue the reopen work to workqueue, thus user daemon could get rid of daemon_read context and handle that request smoothly. Otherwise, the user daemon will send a reopen request and wait for itself to process the request. Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com> Link: https://lore.kernel.org/r/20231120041422.75170-4-zhujia.zj@bytedance.com Reviewed-by: Jingbo Xu <jefflexu@linux.alibaba.com> Reviewed-by: David Howells <dhowells@redhat.com> Signed-off-by: Christian Brauner <brauner@kernel.org> Stable-dep-of: 0a790040838c ("cachefiles: add spin_lock for cachefiles_ondemand_info") Signed-off-by: Sasha Levin <sashal@kernel.org>