nfsd: add nfsd_serv_try_get and nfsd_serv_put

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Introduce nfsd_serv_try_get and nfsd_serv_put and update the nfsd code
to prevent nfsd_destroy_serv from destroying nn->nfsd_serv until any
caller of nfsd_serv_try_get releases their reference using nfsd_serv_put.

A percpu_ref is used to implement the interlock between
nfsd_destroy_serv and any caller of nfsd_serv_try_get.

This interlock is needed to properly wait for the completion of client
initiated localio calls to nfsd (that are _not_ in the context of nfsd).

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>

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Mike Snitzer 2024-09-05 15:09:44 -04:00 • committed by Anna Schumaker

parent c63f0e48fe

commit 47e988147f

2 changed files with 50 additions and 1 deletions

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8

fs/nfsd/netns.h

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43

fs/nfsd/nfssvc.c

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