NFSv4: add cl_root_cred for use when machine cred is not available.

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NFSv4 state management tries a root credential when no machine
credential is available, as can happen with kerberos.
It does this by replacing the cl_machine_cred with a root credential.
This means that any user of the machine credential needs to take
a lock while getting a reference to the machine credential, which is
a little cumbersome.

So introduce an explicit cl_root_cred, and never free either
credential until client shutdown.  This means that no locking
is needed to reference these credentials.  Future patches
will make use of this.

This is only a temporary addition.  both cl_machine_cred and
cl_root_cred will disappear later in the series.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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NeilBrown 2018-12-03 11:30:30 +11:00 • committed by Anna Schumaker

parent 1a80810fbf

commit a534ecb013

3 changed files with 15 additions and 8 deletions

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2

fs/nfs/client.c

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20

fs/nfs/nfs4state.c

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1

include/linux/nfs_fs_sb.h

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