new 'features/read-only' module added

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 712 (mount.glusterfs script doesn't handle 'ro' option)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=712

3 files changed, 322 insertions, 0 deletions

diff --git a/xlators/features/read-only/Makefile.am b/xlators/features/read-only/Makefile.am
new file mode 100644
index 00000000000..d471a3f9243
--- /dev/null
+++ b/xlators/features/read-only/Makefile.am
@@ -0,0 +1,3 @@
+SUBDIRS = src
+
+CLEANFILES = 
diff --git a/xlators/features/read-only/src/Makefile.am b/xlators/features/read-only/src/Makefile.am
new file mode 100644
index 00000000000..15f49966ff7
--- /dev/null
+++ b/xlators/features/read-only/src/Makefile.am
@@ -0,0 +1,13 @@
+xlator_LTLIBRARIES = read-only.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/features
+
+read_only_la_LDFLAGS = -module -avoidversion
+
+read_only_la_SOURCES = read-only.c
+read_only_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la 
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+	-I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES = 
+
diff --git a/xlators/features/read-only/src/read-only.c b/xlators/features/read-only/src/read-only.c
new file mode 100644
index 00000000000..08412bf047d
--- /dev/null
+++ b/xlators/features/read-only/src/read-only.c
@@ -0,0 +1,306 @@
+/*
+  Copyright (c) 2008-2009 Gluster, Inc. <http://www.gluster.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "xlator.h"
+#include "defaults.h"
+
+int32_t
+ro_xattrop (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            gf_xattrop_flags_t flags, dict_t *dict)
+{
+        STACK_UNWIND_STRICT (xattrop, frame, -1, EROFS, NULL);
+        return 0;
+}
+
+int32_t
+ro_fxattrop (call_frame_t *frame, xlator_t *this,
+             fd_t *fd, gf_xattrop_flags_t flags, dict_t *dict)
+{
+        STACK_UNWIND_STRICT (fxattrop, frame, -1, EROFS, NULL);
+        return 0;
+}
+
+int32_t
+ro_entrylk (call_frame_t *frame, xlator_t *this, const char *volume,
+            loc_t *loc, const char *basename, entrylk_cmd cmd,
+            entrylk_type type)
+{
+        STACK_UNWIND_STRICT (entrylk, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+ro_fentrylk (call_frame_t *frame, xlator_t *this, const char *volume,
+             fd_t *fd, const char *basename, entrylk_cmd cmd, entrylk_type type)
+{
+        STACK_UNWIND_STRICT (fentrylk, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+ro_inodelk (call_frame_t *frame, xlator_t *this, const char *volume,
+            loc_t *loc, int32_t cmd, struct flock *lock)
+{
+        STACK_UNWIND_STRICT (inodelk, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+ro_finodelk (call_frame_t *frame, xlator_t *this, const char *volume,
+             fd_t *fd, int32_t cmd, struct flock *lock)
+{
+        STACK_UNWIND_STRICT (finodelk, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+ro_lk (call_frame_t *frame, xlator_t *this, fd_t *fd, int cmd,
+       struct flock *flock)
+{
+        STACK_UNWIND_STRICT (lk, frame, -1, EROFS, NULL);
+        return 0;
+}
+
+int32_t
+ro_setattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+            struct iatt *stbuf, int32_t valid)
+{
+        STACK_UNWIND_STRICT (setattr, frame, -1, EROFS, NULL, NULL);
+	return 0;
+}
+
+int32_t
+ro_fsetattr (call_frame_t *frame, xlator_t *this, fd_t *fd,
+             struct iatt *stbuf, int32_t valid)
+{
+        STACK_UNWIND_STRICT (fsetattr, frame, -1, EROFS, NULL, NULL);
+        return 0;
+}
+
+
+int32_t
+ro_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset)
+{
+        STACK_UNWIND_STRICT (truncate, frame, -1, EROFS, NULL, NULL);
+	return 0;
+}
+
+int32_t
+ro_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset)
+{
+        STACK_UNWIND_STRICT (ftruncate, frame, -1, EROFS, NULL, NULL);
+	return 0;
+}
+
+int32_t
+ro_mknod (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode,
+          dev_t rdev)
+{
+        STACK_UNWIND_STRICT (mknod, frame, -1, EROFS, NULL, NULL, NULL, NULL);
+        return 0;
+}
+
+
+int32_t
+ro_mkdir (call_frame_t *frame, xlator_t *this, loc_t *loc, mode_t mode)
+{
+        STACK_UNWIND_STRICT (mkdir, frame, -1, EROFS, NULL, NULL, NULL, NULL);
+        return 0;
+}
+
+int32_t
+ro_unlink (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        STACK_UNWIND_STRICT (unlink, frame, -1, EROFS, NULL, NULL);
+        return 0;
+}
+
+int32_t
+ro_rmdir (call_frame_t *frame, xlator_t *this, loc_t *loc)
+{
+        STACK_UNWIND_STRICT (rmdir, frame, -1, EROFS, NULL, NULL);
+        return 0;
+}
+
+int32_t
+ro_symlink (call_frame_t *frame, xlator_t *this, const char *linkpath,
+            loc_t *loc)
+{
+        STACK_UNWIND_STRICT (symlink, frame, -1, EROFS, NULL, NULL, NULL, NULL);
+        return 0;
+}
+
+
+
+int32_t
+ro_rename (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc)
+{
+        STACK_UNWIND_STRICT (rename, frame, -1, EROFS, NULL, NULL, NULL, NULL,
+                             NULL);
+        return 0;
+}
+
+
+int32_t
+ro_link (call_frame_t *frame, xlator_t *this, loc_t *oldloc, loc_t *newloc)
+{
+        STACK_UNWIND_STRICT (link, frame, -1, EROFS, NULL, NULL, NULL, NULL);
+        return 0;
+}
+
+int32_t
+ro_create (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
+           mode_t mode, fd_t *fd)
+{
+        STACK_UNWIND_STRICT (create, frame, -1, EROFS, NULL, NULL, NULL,
+                             NULL, NULL);
+        return 0;
+}
+
+
+static int32_t
+ro_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
+             int32_t op_errno, fd_t *fd)
+{
+	STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd);
+	return 0;
+}
+
+int32_t
+ro_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
+         fd_t *fd, int32_t wbflags)
+{
+        if (((flags & O_ACCMODE) == O_WRONLY) ||
+              ((flags & O_ACCMODE) == O_RDWR)) {
+                STACK_UNWIND_STRICT (open, frame, -1, EROFS, NULL);
+                return 0;
+	}
+
+	STACK_WIND (frame, ro_open_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->open, loc, flags, fd, wbflags);
+	return 0;
+}
+
+int32_t
+ro_fsetxattr (call_frame_t *frame, xlator_t *this, fd_t *fd, dict_t *dict,
+              int32_t flags)
+{
+        STACK_UNWIND_STRICT (fsetxattr, frame, -1, EROFS);
+	return 0;
+}
+
+int32_t
+ro_fsyncdir (call_frame_t *frame, xlator_t *this, fd_t *fd, int32_t flags)
+{
+        STACK_UNWIND_STRICT (fsyncdir, frame, -1, EROFS);
+	return 0;
+}
+
+int32_t
+ro_writev (call_frame_t *frame, xlator_t *this, fd_t *fd, struct iovec *vector,
+           int32_t count, off_t off, struct iobref *iobref)
+{
+        STACK_UNWIND_STRICT (writev, frame, -1, EROFS, NULL, NULL);
+        return 0;
+}
+
+
+int32_t
+ro_setxattr (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *dict,
+             int32_t flags)
+{
+        STACK_UNWIND_STRICT (setxattr, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+ro_removexattr (call_frame_t *frame, xlator_t *this, loc_t *loc,
+                const char *name)
+{
+        STACK_UNWIND_STRICT (removexattr, frame, -1, EROFS);
+        return 0;
+}
+
+int32_t
+init (xlator_t *this)
+{
+	if (!this->children || this->children->next) {
+		gf_log (this->name, GF_LOG_ERROR,
+			"translator not configured with exactly one child");
+		return -1;
+	}
+
+	if (!this->parents) {
+		gf_log (this->name, GF_LOG_WARNING,
+			"dangling volume. check volfile ");
+	}
+
+	return 0;
+}
+
+
+void
+fini (xlator_t *this)
+{
+	return;
+}
+
+
+struct xlator_fops fops = {
+        .mknod       = ro_mknod,
+        .mkdir       = ro_mkdir,
+        .unlink      = ro_unlink,
+        .rmdir       = ro_rmdir,
+        .symlink     = ro_symlink,
+        .rename      = ro_rename,
+        .link        = ro_link,
+        .truncate    = ro_truncate,
+        .open        = ro_open,
+        .writev      = ro_writev,
+        .setxattr    = ro_setxattr,
+        .fsetxattr   = ro_fsetxattr,
+        .removexattr = ro_removexattr,
+        .fsyncdir    = ro_fsyncdir,
+        .ftruncate   = ro_ftruncate,
+        .create      = ro_create,
+        .setattr     = ro_setattr,
+        .fsetattr    = ro_fsetattr,
+        .xattrop     = ro_xattrop,
+        .fxattrop    = ro_fxattrop,
+        .inodelk     = ro_inodelk,
+        .finodelk    = ro_finodelk,
+        .entrylk     = ro_entrylk,
+        .fentrylk    = ro_fentrylk,
+        .lk          = ro_lk,
+};
+
+struct xlator_mops mops = {
+};
+
+struct xlator_cbks cbks = {
+};
+
+struct volume_options options[] = {
+	{ .key = {NULL} },
+};