cachefiles: add restore command to recover inflight ondemand read requests

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[ Upstream commit e73fa11a35 ]

Previously, in ondemand read scenario, if the anonymous fd was closed by
user daemon, inflight and subsequent read requests would return EIO.
As long as the device connection is not released, user daemon can hold
and restore inflight requests by setting the request flag to
CACHEFILES_REQ_NEW.

Suggested-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Signed-off-by: Jia Zhu <zhujia.zj@bytedance.com>
Signed-off-by: Xin Yin <yinxin.x@bytedance.com>
Link: https://lore.kernel.org/r/20231120041422.75170-6-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: 4b4391e77a ("cachefiles: defer exposing anon_fd until after copy_to_user() succeeds")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jia Zhu 2023-11-20 12:14:22 +08:00 • committed by Greg Kroah-Hartman

parent 5344f2ab31

commit a0cc87f866

3 changed files with 27 additions and 0 deletions

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1

fs/cachefiles/daemon.c

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3

fs/cachefiles/internal.h

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23

fs/cachefiles/ondemand.c

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