nfs: Change NFS3 access op to use access fop

This change is needed so that we have a uniform dependence on
posix-acl for permission checks as well as ACL checks.

Signed-off-by: Shehjar Tikoo <shehjart@gluster.com>
Signed-off-by: Vijay Bellur <vijay@gluster.com>

BUG: 3057 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=3057

7 files changed, 84 insertions, 174 deletions

diff --git a/xlators/nfs/server/src/nfs-fops.c b/xlators/nfs/server/src/nfs-fops.c
index ff055aa51ca..0a0e01fc9ec 100644
--- a/xlators/nfs/server/src/nfs-fops.c
+++ b/xlators/nfs/server/src/nfs-fops.c
@@ -353,6 +353,48 @@ err:
         return ret;
 }
 
+int32_t
+nfs_fop_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                    int32_t op_ret, int32_t op_errno)
+{
+        struct nfs_fop_local    *nfl = NULL;
+        fop_access_cbk_t        progcbk = NULL;
+
+        nfl_to_prog_data (nfl, progcbk, frame);
+        if (progcbk)
+                progcbk (frame, cookie, this, op_ret, op_errno);
+
+        nfs_stack_destroy (nfl, frame);
+        return 0;
+}
+
+int
+nfs_fop_access (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *loc,
+                int32_t accesstest, fop_access_cbk_t cbk, void *local)
+{
+        call_frame_t            *frame = NULL;
+        int                     ret = -EFAULT;
+        struct nfs_fop_local    *nfl = NULL;
+
+        if ((!xl) || (!loc) || (!nfu))
+                return ret;
+
+        gf_log (GF_NFS, GF_LOG_TRACE, "Access: %s", loc->path);
+        nfs_fop_handle_frame_create (frame, nfsx, nfu, ret, err);
+        nfs_fop_handle_local_init (frame, nfsx, nfl, cbk, local, ret, err);
+        nfs_fop_save_root_ino (nfl, loc);
+
+        STACK_WIND_COOKIE (frame, nfs_fop_access_cbk, xl, xl, xl->fops->access,
+                           loc, accesstest);
+        ret = 0;
+err:
+        if (ret < 0) {
+                if (frame)
+                        nfs_stack_destroy (nfl, frame);
+        }
+
+        return ret;
+}
 
 int32_t
 nfs_fop_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
diff --git a/xlators/nfs/server/src/nfs-fops.h b/xlators/nfs/server/src/nfs-fops.h
index d010db2829b..4d09e3e242e 100644
--- a/xlators/nfs/server/src/nfs-fops.h
+++ b/xlators/nfs/server/src/nfs-fops.h
@@ -233,4 +233,7 @@ extern int
 nfs_fop_stat (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *loc,
               fop_stat_cbk_t cbk, void *local);
 
+extern int
+nfs_fop_access (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *loc,
+                int32_t accesstest, fop_access_cbk_t cbk, void *local);
 #endif
diff --git a/xlators/nfs/server/src/nfs-generics.c b/xlators/nfs/server/src/nfs-generics.c
index 0ebba689a35..010fb17564c 100644
--- a/xlators/nfs/server/src/nfs-generics.c
+++ b/xlators/nfs/server/src/nfs-generics.c
@@ -46,6 +46,19 @@ nfs_fstat (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, fd_t *fd,
         return ret;
 }
 
+int
+nfs_access (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+            int32_t accesstest, fop_access_cbk_t cbk, void *local)
+{
+        int             ret = -EFAULT;
+
+        if ((!nfsx) || (!xl) || (!pathloc) || (!nfu))
+                return ret;
+
+        ret = nfs_fop_access (nfsx, xl, nfu, pathloc, accesstest, cbk, local);
+
+        return ret;
+}
 
 int
 nfs_stat (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
diff --git a/xlators/nfs/server/src/nfs-generics.h b/xlators/nfs/server/src/nfs-generics.h
index 91915f120ea..fa907b7c555 100644
--- a/xlators/nfs/server/src/nfs-generics.h
+++ b/xlators/nfs/server/src/nfs-generics.h
@@ -157,4 +157,8 @@ nfs_read_sync (xlator_t *xl, nfs_user_t *nfu, fd_t *fd, size_t size,
 extern int
 nfs_opendir (xlator_t *nfsx, xlator_t *fopxl, nfs_user_t *nfu, loc_t *pathloc,
              fop_opendir_cbk_t cbk, void *local);
+
+extern int
+nfs_access (xlator_t *nfsx, xlator_t *xl, nfs_user_t *nfu, loc_t *pathloc,
+            int32_t accesstest, fop_access_cbk_t cbk, void *local);
 #endif
diff --git a/xlators/nfs/server/src/nfs3-helpers.c b/xlators/nfs/server/src/nfs3-helpers.c
index 468f8f7af4a..caeff9261de 100644
--- a/xlators/nfs/server/src/nfs3-helpers.c
+++ b/xlators/nfs/server/src/nfs3-helpers.c
@@ -565,171 +565,31 @@ nfs3_prep_access3args (access3args *args, struct nfs3_fh *fh)
         args->object.data.data_val = (void *)fh;
 }
 
+#define POSIX_READ      4
+#define POSIX_WRITE     2
+#define POSIX_EXEC      1
 
 uint32_t
-nfs3_owner_accessbits (ia_prot_t prot, ia_type_t type, uint32_t request)
+nfs3_accessbits (int32_t accbits)
 {
-        uint32_t accresult = 0;
-
-        if (IA_PROT_RUSR (prot) && (request & ACCESS3_READ))
-                accresult |= ACCESS3_READ;
-
-        if (request & ACCESS3_LOOKUP)
-                if ((IA_ISDIR (type)) && (IA_PROT_XUSR (prot)))
-                        accresult |= ACCESS3_LOOKUP;
-
-        if ((IA_PROT_WUSR (prot) && (request & ACCESS3_MODIFY)))
-                accresult |= ACCESS3_MODIFY;
-
-        if ((IA_PROT_WUSR (prot) && (request & ACCESS3_EXTEND)))
-                accresult |= ACCESS3_EXTEND;
-
-        /* ACCESS3_DELETE is ignored for now since that requires
-         * knowing the permissions on the parent directory.
-         */
-
-        if (request & ACCESS3_EXECUTE)
-                if (IA_PROT_XUSR (prot) && (!IA_ISDIR (type)))
-                        accresult |= ACCESS3_EXECUTE;
-
-        return accresult;
-}
-
-
-uint32_t
-nfs3_group_accessbits (ia_prot_t prot, ia_type_t type, uint32_t request)
-{
-        uint32_t accresult = 0;
-
-        if (IA_PROT_RGRP (prot) && (request & ACCESS3_READ))
-                accresult |= ACCESS3_READ;
-
-        if (request & ACCESS3_LOOKUP)
-                if ((IA_ISDIR (type)) && IA_PROT_RGRP (prot))
-                        accresult |= ACCESS3_LOOKUP;
-
-        if (IA_PROT_WGRP (prot) && (request & ACCESS3_MODIFY))
-                accresult |= ACCESS3_MODIFY;
-
-        if (IA_PROT_WGRP (prot) && (request & ACCESS3_EXTEND))
-                accresult |= ACCESS3_EXTEND;
-
-        /* ACCESS3_DELETE is ignored for now since that requires
-         * knowing the permissions on the parent directory.
-         */
-
-        if (request & ACCESS3_EXECUTE)
-                if (IA_PROT_XGRP (prot) && (!IA_ISDIR (type)))
-                        accresult |= ACCESS3_EXECUTE;
-
-        return accresult;
-}
-
-
-uint32_t
-nfs3_other_accessbits (ia_prot_t prot, ia_type_t type, uint32_t request)
-{
-        uint32_t accresult = 0;
-
-        if (IA_PROT_ROTH (prot) && (request & ACCESS3_READ))
-                accresult |= ACCESS3_READ;
-
-        if (request & ACCESS3_LOOKUP)
-                if (IA_ISDIR (type) && IA_PROT_ROTH (prot))
-                        accresult |= ACCESS3_LOOKUP;
-
-        if (IA_PROT_WOTH (prot) && (request & ACCESS3_MODIFY))
-                accresult |= ACCESS3_MODIFY;
-
-        if (IA_PROT_WOTH (prot) && (request & ACCESS3_EXTEND))
-                accresult |= ACCESS3_EXTEND;
-
-        /* ACCESS3_DELETE is ignored for now since that requires
-         * knowing the permissions on the parent directory.
-         */
-
-        if (request & ACCESS3_EXECUTE)
-                if (IA_PROT_XOTH (prot) && (!IA_ISDIR (type)))
-                        accresult |= ACCESS3_EXECUTE;
-
-        return accresult;
-}
-
-
-uint32_t
-nfs3_superuser_accessbits (ia_prot_t prot, ia_type_t type, uint32_t request)
-{
-        uint32_t accresult = 0;
-
-        if (request & ACCESS3_READ)
-                accresult |= ACCESS3_READ;
-
-        if (request & ACCESS3_LOOKUP)
-                if (IA_ISDIR (type))
-                        accresult |= ACCESS3_LOOKUP;
-
-        if (request & ACCESS3_MODIFY)
-                accresult |= ACCESS3_MODIFY;
-
-        if (request & ACCESS3_EXTEND)
-                accresult |= ACCESS3_EXTEND;
-
-        /* ACCESS3_DELETE is ignored for now since that requires
-         * knowing the permissions on the parent directory.
-         */
+        uint32_t        accresult = 0;
 
-        if (request & ACCESS3_EXECUTE)
-                if ((IA_PROT_XOTH (prot) || IA_PROT_XUSR (prot) ||
-                     IA_PROT_XGRP (prot)) && (!IA_ISDIR (type)))
-                        accresult |= ACCESS3_EXECUTE;
+        if (accbits & POSIX_READ)
+                accresult |= (ACCESS3_READ | ACCESS3_LOOKUP);
 
-        return accresult;
-}
+        if (accbits & POSIX_WRITE)
+                accresult |= (ACCESS3_MODIFY | ACCESS3_EXTEND);
 
-
-uint32_t
-nfs3_stat_to_accessbits (struct iatt *buf, uint32_t request, uid_t uid,
-                         gid_t gid, gid_t *auxgids, int gids)
-{
-        uint32_t        accresult = 0;
-        ia_prot_t       prot = {0, };
-        ia_type_t       type = 0;
-        int             testgid = -1;
-        int             x = 0;
-
-        prot = buf->ia_prot;
-        type = buf->ia_type;
-
-        if (buf->ia_gid == gid)
-                testgid = gid;
-        else {
-                for (; x < gids; ++x) {
-                        if (buf->ia_gid == auxgids[x]) {
-                                testgid = buf->ia_gid;
-                                break;
-                        }
-                }
-        }
-
-        if (uid == 0)
-                accresult = nfs3_superuser_accessbits (prot, type, request);
-        else if (buf->ia_uid == uid)
-                accresult = nfs3_owner_accessbits (prot, type, request);
-        else if ((testgid != -1) && (buf->ia_gid == testgid))
-                accresult = nfs3_group_accessbits (prot, type, request);
-        else
-                accresult = nfs3_other_accessbits (prot, type, request);
+        if (accbits & POSIX_EXEC)
+                accresult |= ACCESS3_EXECUTE;
 
         return accresult;
 }
 
 
 void
-nfs3_fill_access3res (access3res *res, nfsstat3 status, struct iatt *buf,
-                      uint32_t accbits, uid_t uid, gid_t gid,
-                      uint64_t deviceid, gid_t *gidarr, int gids)
+nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits)
 {
-        post_op_attr    objattr;
         uint32_t        accres = 0;
 
         memset (res, 0, sizeof (*res));
@@ -737,11 +597,8 @@ nfs3_fill_access3res (access3res *res, nfsstat3 status, struct iatt *buf,
         if (status != NFS3_OK)
                 return;
 
-        nfs3_map_deviceid_to_statdev (buf, deviceid);
-        objattr = nfs3_stat_to_post_op_attr (buf);
-        accres = nfs3_stat_to_accessbits (buf, accbits, uid, gid, gidarr, gids);
+        accres = nfs3_accessbits (accbits);
 
-        res->access3res_u.resok.obj_attributes = objattr;
         res->access3res_u.resok.access = accres;
 }
 
diff --git a/xlators/nfs/server/src/nfs3-helpers.h b/xlators/nfs/server/src/nfs3-helpers.h
index 8fb11ff15d1..73bb4b720b1 100644
--- a/xlators/nfs/server/src/nfs3-helpers.h
+++ b/xlators/nfs/server/src/nfs3-helpers.h
@@ -99,9 +99,7 @@ extern void
 nfs3_prep_access3args (access3args *args, struct nfs3_fh *fh);
 
 extern void
-nfs3_fill_access3res (access3res *res, nfsstat3 status, struct iatt *buf,
-                      uint32_t accbits, uid_t uid, gid_t gid,
-                      uint64_t deviceid, gid_t *auxgids, int gids);
+nfs3_fill_access3res (access3res *res, nfsstat3 status, int32_t accbits);
 
 extern char *
 nfs3_fhcache_getpath (struct nfs3_state *nfs3, struct nfs3_fh *fh);
diff --git a/xlators/nfs/server/src/nfs3.c b/xlators/nfs/server/src/nfs3.c
index cd0a543f6cf..70ce23a3990 100644
--- a/xlators/nfs/server/src/nfs3.c
+++ b/xlators/nfs/server/src/nfs3.c
@@ -1367,20 +1367,13 @@ rpcerr:
 
 
 int
-nfs3_access_reply (rpcsvc_request_t *req, nfsstat3 status, struct iatt *buf,
-                   uint32_t accbits)
+nfs3_access_reply (rpcsvc_request_t *req, nfsstat3 status, int32_t accbits)
 {
         access3res      res;
         uint64_t        deviceid = 0;
-        gid_t           *gidarr = NULL;
-        int             gids = 0;
 
         deviceid = nfs3_request_xlator_deviceid (req);
-        gidarr = nfs_rpcsvc_auth_unix_auxgids (req, &gids);
-        nfs3_fill_access3res (&res, status, buf, accbits,
-                              nfs_rpcsvc_request_uid (req),
-                              nfs_rpcsvc_request_gid (req), deviceid, gidarr,
-                              gids);
+        nfs3_fill_access3res (&res, status, accbits);
         nfs3svc_submit_reply (req, &res,
                               (nfs3_serializer)xdr_serialize_access3res);
         return 0;
@@ -1389,7 +1382,7 @@ nfs3_access_reply (rpcsvc_request_t *req, nfsstat3 status, struct iatt *buf,
 
 int32_t
 nfs3svc_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
-                    int32_t op_ret, int32_t op_errno, struct iatt *buf)
+                    int32_t op_ret, int32_t op_errno)
 {
         nfsstat3                status = NFS3_OK;
         nfs3_call_state_t       *cs = NULL;
@@ -1401,7 +1394,7 @@ nfs3svc_access_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
 
         nfs3_log_common_res (nfs_rpcsvc_request_xid (cs->req), "ACCESS", status,
                              op_errno);
-        nfs3_access_reply (cs->req, status, buf, cs->accessbits);
+        nfs3_access_reply (cs->req, status, op_errno);
         nfs3_call_state_wipe (cs);
 
         return 0;
@@ -1422,8 +1415,8 @@ nfs3_access_resume (void *carg)
         nfs3_check_fh_resolve_status (cs, stat, nfs3err);
         cs->fh = cs->resolvefh;
         nfs_request_user_init (&nfu, cs->req);
-        ret = nfs_stat (cs->nfsx, cs->vol, &nfu, &cs->resolvedloc,
-                        nfs3svc_access_cbk, cs);
+        ret = nfs_access (cs->nfsx, cs->vol, &nfu, &cs->resolvedloc,
+                          cs->accessbits, nfs3svc_access_cbk, cs);
         if (ret < 0)
                 stat = nfs3_errno_to_nfsstat3 (-ret);
 
@@ -1431,7 +1424,7 @@ nfs3err:
         if (ret < 0) {
                 nfs3_log_common_res (nfs_rpcsvc_request_xid (cs->req), "ACCESS",
                                      stat, -ret);
-                nfs3_access_reply (cs->req, stat, NULL, 0);
+                nfs3_access_reply (cs->req, stat, 0);
                 nfs3_call_state_wipe (cs);
                 ret = 0;
         }
@@ -1468,7 +1461,7 @@ nfs3err:
         if (ret < 0) {
                 nfs3_log_common_res (nfs_rpcsvc_request_xid (req), "ACCESS",
                                      stat, -ret);
-                nfs3_access_reply (req, stat, NULL, 0);
+                nfs3_access_reply (req, stat, 0);
                 nfs3_call_state_wipe (cs);
                 ret = 0;
         }