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NFS: move credential expiry tracking out of SUNRPC into NFS.

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NFS needs to know when a credential is about to expire so that
it can modify write-back behaviour to finish the write inside the
expiry time.
It currently uses functions in SUNRPC code which make use of a
fairly complex callback scheme and flags in the generic credientials.

As I am working to discard the generic credentials, this has to change.

This patch moves the logic into NFS, in part by finding and caching
the low-level credential in the open_context.  We then make direct
cred-api calls on that.

This makes the code much simpler and removes a dependency on generic
rpc credentials.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
NeilBrown 2018-12-03 11:30:30 +11:00 • committed by Anna Schumaker
parent 1de7eea929
commit ddf529eeed
7 changed files with 28 additions and 124 deletions
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2
fs/nfs/inode.c
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@ -962,6 +962,7 @@ struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
nfs_sb_active(dentry->d_sb);
ctx->dentry = dget(dentry);
ctx->cred = cred;
ctx->ll_cred = NULL;
ctx->state = NULL;
ctx->mode = f_mode;
ctx->flags = 0;
@ -1001,6 +1002,7 @@ static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
put_rpccred(ctx->cred);
dput(ctx->dentry);
nfs_sb_deactive(sb);
put_rpccred(ctx->ll_cred);
kfree(ctx->mdsthreshold);
kfree_rcu(ctx, rcu_head);
}