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From: Shyam Prasad N <>
To: "Steve French" <>,
	"Aurélien Aptel" <>,
	CIFS <>,, "rohiths msft" <>
Subject: Multichannel patches
Date: Wed, 2 Jun 2021 18:13:26 +0530	[thread overview]
Message-ID: <> (raw)

Made a bunch of fixes in mchan reconnect scenarios with these patches.
The reconnect codepath did not play well with mchan. Making it work
involved several changes described in the commits.
A trivial ref-counting fix in session find codepath.
Fixes in reconnect codepath, involving changes to introduce a
per-channel bitmask for a session, instead of a boolean, and to
reconnect the session only when we have all channels marked for
reconnect. This makes sessions more resilient in mchan scenarios.
Fix to get rid of the serialization of requests during channel
binding. This involved passing the channel server pointer to all
negotiate and session setup related functions. This has increased the
diff size, otherwise the changes are quite minimal.

P.S. There is a logic in cifs_reconnect to switch between the targets
for the server. I don't think these changes will break the DFS
scenario. The code will likely take effect only for when the primary
channel reconnects (as DFS server entries are cached with super block
as the key). Perhaps more changes will be needed there to also switch
between the targets for individual channels (maybe use superblock +
channel num as the key for caching entries?). Folks with better
knowledge than me with this code may want to check on this?

@Steve French It'll be good to let a few cycles of buildbot to run
with this code, before submitting to upstream. I have run a bunch of
tests with this. However, more soak time will be safer.


             reply	other threads:[~2021-06-02 12:44 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02 12:43 Shyam Prasad N [this message]
2021-06-02 15:57 ` Multichannel patches Aurélien Aptel
2021-06-02 18:55   ` Steve French
2021-06-02 16:45 ` Paulo Alcantara
2021-06-04  9:13   ` Shyam Prasad N
2021-06-04 15:10     ` Steve French
2021-06-04 15:25     ` Paulo Alcantara
2021-06-05 14:08       ` Shyam Prasad N
2021-06-05 17:43         ` Steve French
2021-06-05 17:57           ` Steve French
2021-06-08  9:54             ` Shyam Prasad N

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