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SUNRPC: add 'struct cred *' to auth_cred and rpc_cred

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The SUNRPC credential framework was put together before
Linux has 'struct cred'.  Now that we have it, it makes sense to
use it.
This first step just includes a suitable 'struct cred *' pointer
in every 'struct auth_cred' and almost every 'struct rpc_cred'.

The rpc_cred used for auth_null has a NULL 'struct cred *' as nothing
else really makes sense.

For rpc_cred, the pointer is reference counted.
For auth_cred it isn't.  struct auth_cred are either allocated on
the stack, in which case the thread owns a reference to the auth,
or are part of 'struct generic_cred' in which case gc_base owns the
reference, and "acred" shares it.

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 f06bc03339
commit 97f68c6b02
7 changed files with 48 additions and 3 deletions
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17
fs/nfs/flexfilelayout/flexfilelayout.c
View file

@ -9,6 +9,7 @@
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/module.h>
#include <linux/sched/mm.h>
#include <linux/sunrpc/metrics.h>
@ -415,6 +416,7 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
struct nfs4_ff_layout_mirror *mirror;
struct auth_cred acred = { .group_info = ff_zero_group };
struct rpc_cred __rcu *cred;
struct cred *kcred;
u32 ds_count, fh_count, id;
int j;
@ -491,8 +493,23 @@ ff_layout_alloc_lseg(struct pnfs_layout_hdr *lh,
acred.gid = make_kgid(&init_user_ns, id);
if (gfp_flags & __GFP_FS)
kcred = prepare_kernel_cred(NULL);
else {
unsigned int nofs_flags = memalloc_nofs_save();
kcred = prepare_kernel_cred(NULL);
memalloc_nofs_restore(nofs_flags);
}
rc = -ENOMEM;
if (!kcred)
goto out_err_free;
kcred->fsuid = acred.uid;
kcred->fsgid = acred.gid;
acred.cred = kcred;
/* find the cred for it */
rcu_assign_pointer(cred, rpc_lookup_generic_cred(&acred, 0, gfp_flags));
put_cred(kcred);
if (IS_ERR(cred)) {
rc = PTR_ERR(cred);
goto out_err_free;