fuse-bridge: Pass unknown option down to fuse

In Linux, certain "filesystem-specific" options (passed in string form in last
argument to mount(2)), such as "rootcontext" or "context" are in fact common to
all filesystems, including fuse. We should pass them down to the actual
mount(2) call untouched.

This is achieved by adding "fuse-mountopts" option to mount/fuse translator and
adjusting the mount helper to propagate it with unrecognized options as they
are encountered.

BUG: 852754
Change-Id: I309203090c02025334561be235864d8d04e4159b
Signed-off-by: Lubomir Rintel <lubo.rintel@gooddata.com>
Reviewed-on: http://review.gluster.org/3871
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

6 files changed, 44 insertions, 4 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index 2c19e680..621cc47b 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -196,6 +196,8 @@ static struct argp_option gf_options[] = {
          "Enable strict volume file checking"},
         {"mem-accounting", ARGP_MEM_ACCOUNTING_KEY, 0, OPTION_HIDDEN,
          "Enable internal memory accounting"},
+        {"fuse-mountopts", ARGP_FUSE_MOUNTOPTS_KEY, "OPTIONS", OPTION_HIDDEN,
+         "Extra mount options to pass to FUSE"},
         {0, 0, 0, 0, "Miscellaneous Options:"},
         {0, }
 };
@@ -489,6 +491,17 @@ create_fuse_mount (glusterfs_ctx_t *ctx)
         if (ret)
                 goto err;
 
+        if (cmd_args->fuse_mountopts) {
+                ret = dict_set_static_ptr (master->options, ZR_FUSE_MOUNTOPTS,
+                                           cmd_args->fuse_mountopts);
+                if (ret < 0) {
+                        gf_log ("glusterfsd", GF_LOG_ERROR,
+                                "failed to set dict value for key %s",
+                                ZR_FUSE_MOUNTOPTS);
+                        goto err;
+                }
+        }
+
         ret = xlator_init (master);
         if (ret) {
                 gf_log ("", GF_LOG_DEBUG, "failed to initialize fuse translator");
@@ -932,6 +945,10 @@ parse_opts (int key, char *arg, struct argp_state *state)
                 argp_failure (state, -1, 0,
                               "unknown congestion threshold option %s", arg);
                 break;
+
+        case ARGP_FUSE_MOUNTOPTS_KEY:
+                cmd_args->fuse_mountopts = gf_strdup (arg);
+                break;
 	}
 
         return 0;
diff --git a/glusterfsd/src/glusterfsd.h b/glusterfsd/src/glusterfsd.h
index dab7f041..483a2175 100644
--- a/glusterfsd/src/glusterfsd.h
+++ b/glusterfsd/src/glusterfsd.h
@@ -84,6 +84,7 @@ enum argp_option_keys {
 	ARGP_FUSE_BACKGROUND_QLEN_KEY     = 161,
 	ARGP_FUSE_CONGESTION_THRESHOLD_KEY = 162,
         ARGP_INODE32_KEY                  = 163,
+	ARGP_FUSE_MOUNTOPTS_KEY		  = 164,
 };
 
 struct _gfd_vol_top_priv_t {
diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 68d9bbc9..57bc7998 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -76,6 +76,7 @@
 #define ZR_DIRECT_IO_OPT        "direct-io-mode"
 #define ZR_STRICT_VOLFILE_CHECK "strict-volfile-check"
 #define ZR_DUMP_FUSE            "dump-fuse"
+#define ZR_FUSE_MOUNTOPTS       "fuse-mountopts"
 
 #define GF_XATTR_CLRLK_CMD      "glusterfs.clrlk"
 #define GF_XATTR_PATHINFO_KEY   "trusted.glusterfs.pathinfo"
@@ -318,6 +319,7 @@ struct _cmd_args {
         unsigned         uid_map_root;
         int              background_qlen;
         int              congestion_threshold;
+        char            *fuse_mountopts;
 
 	/* key args */
 	char            *mount_point;
diff --git a/xlators/mount/fuse/src/fuse-bridge.c b/xlators/mount/fuse/src/fuse-bridge.c
index 726e500e..f9d38462 100644
--- a/xlators/mount/fuse/src/fuse-bridge.c
+++ b/xlators/mount/fuse/src/fuse-bridge.c
@@ -4655,6 +4655,8 @@ init (xlator_t *this_xl)
 	GF_OPTION_INIT("gid-timeout", priv->gid_cache_timeout, int32,
 		cleanup_exit);
 
+	GF_OPTION_INIT ("fuse-mountopts", priv->fuse_mountopts, str, cleanup_exit);
+
 	if (gid_cache_init(&priv->gid_cache, priv->gid_cache_timeout) < 0) {
 		gf_log("glusterfs-fuse", GF_LOG_ERROR, "Failed to initialize "
 			"group cache.");
@@ -4716,9 +4718,11 @@ init (xlator_t *this_xl)
                 goto cleanup_exit;
         }
 
-        gf_asprintf (&mnt_args, "%s%sallow_other,max_read=131072",
+        gf_asprintf (&mnt_args, "%s%s%s%sallow_other,max_read=131072",
                      priv->read_only ? "ro," : "",
-                     priv->acl ? "" : "default_permissions,");
+                     priv->acl ? "" : "default_permissions,",
+                     priv->fuse_mountopts ? priv->fuse_mountopts : "",
+                     priv->fuse_mountopts ? "," : "");
         if (!mnt_args)
                 goto cleanup_exit;
 
@@ -4886,5 +4890,8 @@ struct volume_options options[] = {
           .min = 12,
           .max = (64 * GF_UNIT_KB),
         },
+        { .key = {"fuse-mountopts"},
+          .type = GF_OPTION_TYPE_STR
+        },
         { .key = {NULL} },
 };
diff --git a/xlators/mount/fuse/src/fuse-bridge.h b/xlators/mount/fuse/src/fuse-bridge.h
index 3f45f064..7db9d653 100644
--- a/xlators/mount/fuse/src/fuse-bridge.h
+++ b/xlators/mount/fuse/src/fuse-bridge.h
@@ -107,6 +107,7 @@ struct fuse_private {
         gf_boolean_t         enable_ino32;
         fdtable_t           *fdtable;
 	gid_cache_t	     gid_cache;
+        char                *fuse_mountopts;
 
         /* For fuse-reverse-validation */
         int                  revchan_in;
diff --git a/xlators/mount/fuse/utils/mount.glusterfs.in b/xlators/mount/fuse/utils/mount.glusterfs.in
index 9b9c0f81..0d92bfbd 100755
--- a/xlators/mount/fuse/utils/mount.glusterfs.in
+++ b/xlators/mount/fuse/utils/mount.glusterfs.in
@@ -156,6 +156,10 @@ start_glusterfs ()
 	cmd_line=$(echo "$cmd_line --congestion-threshold=$cong_threshold");
     fi
 
+    if [ -n "$fuse_mountopts" ]; then
+	cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
+    fi
+
     # for rdma volume, we have to fetch volfile with '.rdma' added
     # to volume name, so that it fetches the right client vol file
     volume_id_rdma="";
@@ -190,6 +194,10 @@ start_glusterfs ()
         cmd_line=$(echo "$cmd_line --volfile=$volfile_loc");
     fi
 
+    if [ -n "$fuse_mountopts" ]; then
+	cmd_line=$(echo "$cmd_line --fuse-mountopts=$fuse_mountopts");
+    fi
+
     cmd_line=$(echo "$cmd_line $mount_point");
     err=0;
     $cmd_line;
@@ -353,7 +361,12 @@ main ()
 			    "gid-timeout")	gid_timeout=$value ;;
 			    "background-qlen")	bg_qlen=$value ;;
 			    "congestion-threshold")	cong_threshold=$value ;;
-                            *) echo "unknown option $key (ignored)" ;;
+			    "fuse-mountopts")	fuse_mountopts=$value ;;
+                            *)
+                                # Passthru
+                                [ -z "$fuse_mountopts" ] || fuse_mountopts="$fuse_mountopts,"
+                                fuse_mountopts="$fuse_mountopts$pair"
+                                ;;
                         esac
                 esac
             done
@@ -422,4 +435,3 @@ main ()
 }
 
 _init "$@" && main "$@";
-