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| author | NeilBrown <neilb@suse.com> | 2018-12-03 03:30:30 +0300 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2018-12-19 21:52:44 +0300 |
| commit | 97f68c6b02e0225b38d327103c59cfe2ab5ecda7 (patch) | |
| tree | 87d434407fef925b2d3fefad5dd759d33b9eb31a /fs/nfs/flexfilelayout/flexfilelayout.c | |
| parent | f06bc03339ad4c1baa964a5f0606247ac1c3c50b (diff) | |
| download | linux-97f68c6b02e0225b38d327103c59cfe2ab5ecda7.tar.xz | |
SUNRPC: add 'struct cred *' to auth_cred and rpc_cred
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>
Diffstat (limited to 'fs/nfs/flexfilelayout/flexfilelayout.c')
| -rw-r--r-- | fs/nfs/flexfilelayout/flexfilelayout.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index 310d7500f665..22e164106333 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -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; |