Hi David, Jeffle & Xiang
In production environment, process crashes sometimes occurs.
In cachefiles on-demand read scenario, if user daemon crashes,
requests will return -EIO.
User programs which do not consider this error will trap into
uncertain state.
Based on this, we came up with a user daemon crash recover scheme.
Even if user daemon crashes, the device connection and anonymous fd
will not be released. Recovered user daemon only needs to write 'restore'
to /dev/cachefiles to restore in-flight requests.
Userspace Crash Recover Demo (Based on Jeffle's User Demo)
--------------------------
Git tree:
https://github.com/userzj/demand-read-cachefilesd.git main
Gitweb:
https://github.com/userzj/demand-read-cachefilesd
Jia Zhu (1):
cachefiles: Add a command to restore on-demand requests
fs/cachefiles/daemon.c | 1 +
fs/cachefiles/internal.h | 3 +++
fs/cachefiles/ondemand.c | 25 +++++++++++++++++++++++++
3 files changed, 29 insertions(+)
--
2.20.1
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