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SUNRPC: take a xprt offline using sysfs

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Using sysfs's xprt_state attribute, mark a particular transport offline.
It will not be picked during the round-robin selection. It's not allowed
to take the main (1st created transport associated with the rpc_client)
offline. Also bring a transport back online via sysfs by writing "online"
and that would allow for this transport to be picked during the round-
robin selection.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Olga Kornievskaia 2021-06-23 23:28:50 -04:00 • committed by Trond Myklebust
parent c1830a63c7
commit 5b7eb78486
4 changed files with 68 additions and 6 deletions
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include/linux/sunrpc/xprt.h
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@ -427,6 +427,7 @@ void xprt_release_write(struct rpc_xprt *, struct rpc_task *);
#define XPRT_BOUND (4)
#define XPRT_BINDING (5)
#define XPRT_CLOSING (6)
#define XPRT_OFFLINE (7)
#define XPRT_CONGESTED (9)
#define XPRT_CWND_WAIT (10)
#define XPRT_WRITE_SPACE (11)