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-rw-r--r--xlators/meta/src/view.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/xlators/meta/src/view.c b/xlators/meta/src/view.c
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+++ b/xlators/meta/src/view.c
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+/*
+ Copyright (c) 2006, 2007, 2008 Z RESEARCH, Inc. <http://www.zresearch.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 "glusterfs.h"
+#include "xlator.h"
+
+#include "meta.h"
+
+/*
+ * This file contains fops for the files and directories in
+ * an xlator directory
+ */
+
+/* /.meta/xlators/.../type */
+
+int32_t
+meta_xlator_type_readv (call_frame_t *frame, xlator_t *this,
+ dict_t *fd, size_t size, off_t offset)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ data_t *path_data = dict_get (fd, this->name);
+
+ if (path_data) {
+ const char *path = data_to_str (path_data);
+ meta_dirent_t *file = lookup_meta_entry (root, path, NULL);
+ xlator_t *view_xlator = file->view_xlator;
+
+ int type_size;
+ type_size = strlen (view_xlator->type);
+
+ struct iovec vec;
+ vec.iov_base = view_xlator->type + offset;
+ vec.iov_len = min (type_size - offset, size);
+
+ STACK_UNWIND (frame, vec.iov_len, 0, &vec, 1);
+ return 0;
+ }
+}
+
+int32_t
+meta_xlator_type_getattr (call_frame_t *frame,
+ xlator_t *this,
+ const char *path)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+
+ meta_dirent_t *file = lookup_meta_entry (root, path, NULL);
+ xlator_t *view_xlator = file->view_xlator;
+ file->stbuf->st_size = strlen (view_xlator->type);
+
+ STACK_UNWIND (frame, 0, 0, file->stbuf);
+ return 0;
+}
+
+struct xlator_fops meta_xlator_type_fops = {
+ .readv = meta_xlator_type_readv,
+ .getattr = meta_xlator_type_getattr
+};
+
+/*
+ * fops for the "view" directory
+ * {xlator}/view shows the filesystem as it appears
+ * to {xlator}
+ */
+
+static int32_t
+meta_xlator_view_getattr_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret, int32_t op_errno,
+ struct stat *buf)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, buf);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_getattr (call_frame_t *frame,
+ xlator_t *this,
+ const char *path)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ char *op_path = NULL;
+
+ meta_dirent_t *file = lookup_meta_entry (root, path, &op_path);
+
+ if (op_path) {
+ STACK_WIND (frame, meta_xlator_view_getattr_cbk, file->view_xlator,
+ file->view_xlator->fops->getattr,
+ op_path);
+ }
+ else {
+ STACK_UNWIND (frame, 0, 0, file->stbuf);
+ }
+
+ return 0;
+}
+
+static int32_t
+meta_xlator_view_readdir_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret, int32_t op_errno,
+ dir_entry_t *entries, int32_t count)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, entries, count);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_readdir (call_frame_t *frame,
+ xlator_t *this,
+ const char *path)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ char *op_path = NULL;
+
+ meta_dirent_t *dir = lookup_meta_entry (root, path, &op_path);
+
+ STACK_WIND (frame, meta_xlator_view_readdir_cbk,
+ dir->view_xlator, dir->view_xlator->fops->readdir,
+ op_path ? op_path : "/");
+ return 0;
+}
+
+static int32_t
+meta_xlator_view_open_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this,
+ int32_t op_ret, int32_t op_errno,
+ dict_t *ctx, struct stat *buf)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, ctx, buf);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_open (call_frame_t *frame, xlator_t *this,
+ const char *path, int32_t flags, mode_t mode)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ char *op_path = NULL;
+
+ meta_dirent_t *file = lookup_meta_entry (root, path, &op_path);
+ STACK_WIND (frame, meta_xlator_view_open_cbk,
+ file->view_xlator, file->view_xlator->fops->open,
+ op_path, flags, mode);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_create (call_frame_t *frame, xlator_t *this,
+ const char *path, int32_t flags, mode_t mode)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ char *op_path = NULL;
+
+ meta_dirent_t *file = lookup_meta_entry (root, path, &op_path);
+ STACK_WIND (frame, meta_xlator_view_open_cbk,
+ file->view_xlator, file->view_xlator->fops->create,
+ op_path, flags, mode);
+ return 0;
+}
+
+static int32_t
+meta_xlator_view_readv_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret,
+ int32_t op_errno, struct iovec *vector,
+ int32_t count)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, vector, count);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_readv (call_frame_t *frame, xlator_t *this,
+ dict_t *fd, size_t size, off_t offset)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ data_t *path_data = dict_get (fd, this->name);
+
+ if (path_data) {
+ const char *path = data_to_str (path_data);
+ meta_dirent_t *file = lookup_meta_entry (root, path, NULL);
+
+ STACK_WIND (frame, meta_xlator_view_readv_cbk,
+ file->view_xlator, file->view_xlator->fops->readv,
+ fd, size, offset);
+ return 0;
+ }
+
+ STACK_UNWIND (frame, -1, EBADFD, NULL, 0);
+ return 0;
+}
+
+static int32_t
+meta_xlator_view_writev_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret,
+ int32_t op_errno)
+{
+ STACK_UNWIND (frame, op_ret, op_errno);
+ return 0;
+}
+
+int32_t
+meta_xlator_view_writev (call_frame_t *frame, xlator_t *this,
+ dict_t *fd,
+ struct iovec *vector, int32_t count, off_t offset)
+{
+ meta_private_t *priv = (meta_private_t *) this->private;
+ meta_dirent_t *root = priv->tree;
+ data_t *path_data = dict_get (fd, this->name);
+
+ if (path_data) {
+ const char *path = data_to_str (path_data);
+ meta_dirent_t *file = lookup_meta_entry (root, path, NULL);
+
+ STACK_WIND (frame, meta_xlator_view_writev_cbk,
+ file->view_xlator, file->view_xlator->fops->writev,
+ fd, vector, count, offset);
+ return 0;
+ }
+
+ STACK_UNWIND (frame, -1, EBADFD, NULL, 0);
+ return 0;
+}
+
+struct xlator_fops meta_xlator_view_fops = {
+ .getattr = meta_xlator_view_getattr,
+ .readdir = meta_xlator_view_readdir,
+ .open = meta_xlator_view_open,
+ .create = meta_xlator_view_create,
+ .readv = meta_xlator_view_readv,
+ .writev = meta_xlator_view_writev
+};