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-rw-r--r--xlators/cluster/dht/src/dht-linkfile.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/xlators/cluster/dht/src/dht-linkfile.c b/xlators/cluster/dht/src/dht-linkfile.c
new file mode 100644
index 000000000..9cc24ccf6
--- /dev/null
+++ b/xlators/cluster/dht/src/dht-linkfile.c
@@ -0,0 +1,224 @@
+/*
+ Copyright (c) 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 "compat.h"
+#include "dht-common.h"
+
+
+
+int
+dht_linkfile_xattr_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int op_ret, int op_errno)
+{
+ dht_local_t *local = NULL;
+
+
+ local = frame->local;
+ local->linkfile.linkfile_cbk (frame, cookie, this, op_ret, op_errno,
+ local->linkfile.inode,
+ &local->linkfile.stbuf);
+
+ return 0;
+}
+
+
+int
+dht_linkfile_create_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int op_ret, int op_errno,
+ inode_t *inode, struct stat *stbuf)
+{
+ dht_local_t *local = NULL;
+ call_frame_t *prev = NULL;
+ dict_t *xattr = NULL;
+ data_t *str_data = NULL;
+ int ret = -1;
+
+ local = frame->local;
+ prev = cookie;
+
+ if (op_ret == -1)
+ goto err;
+
+ xattr = get_new_dict ();
+ if (!xattr) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "memory allocation failed :(");
+ op_errno = ENOMEM;
+ goto err;
+ }
+
+ local->linkfile.xattr = dict_ref (xattr);
+ local->linkfile.inode = inode_ref (inode);
+
+ str_data = str_to_data (local->linkfile.srcvol->name);
+ if (!str_data) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "memory allocation failed :(");
+ op_errno = ENOMEM;
+ goto err;
+ }
+
+ ret = dict_set (xattr, "trusted.glusterfs.dht.linkto", str_data);
+ if (ret < 0) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "failed to initialize linkfile data");
+ op_errno = EINVAL;
+ }
+ str_data = NULL;
+
+ local->linkfile.stbuf = *stbuf;
+
+ STACK_WIND (frame, dht_linkfile_xattr_cbk,
+ prev->this, prev->this->fops->setxattr,
+ &local->linkfile.loc, local->linkfile.xattr, 0);
+
+ return 0;
+
+err:
+ if (str_data) {
+ data_destroy (str_data);
+ str_data = NULL;
+ }
+
+ local->linkfile.linkfile_cbk (frame, cookie, this,
+ op_ret, op_errno, inode, stbuf);
+ return 0;
+}
+
+
+int
+dht_linkfile_create (call_frame_t *frame, fop_mknod_cbk_t linkfile_cbk,
+ xlator_t *tovol, xlator_t *fromvol, loc_t *loc)
+{
+ dht_local_t *local = NULL;
+
+
+ local = frame->local;
+ local->linkfile.linkfile_cbk = linkfile_cbk;
+ local->linkfile.srcvol = tovol;
+ loc_copy (&local->linkfile.loc, loc);
+
+ STACK_WIND (frame, dht_linkfile_create_cbk,
+ fromvol, fromvol->fops->mknod, loc,
+ S_IFREG | DHT_LINKFILE_MODE, 0);
+
+ return 0;
+}
+
+
+int
+dht_linkfile_unlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+ int32_t op_ret, int32_t op_errno)
+{
+ dht_local_t *local = NULL;
+ call_frame_t *prev = NULL;
+ xlator_t *subvol = NULL;
+
+ local = frame->local;
+ prev = cookie;
+ subvol = prev->this;
+
+ if (op_ret == -1) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "unlinking linkfile %s on %s failed (%s)",
+ local->loc.path, subvol->name, strerror (op_errno));
+ }
+
+ DHT_STACK_DESTROY (frame);
+
+ return 0;
+}
+
+
+int
+dht_linkfile_unlink (call_frame_t *frame, xlator_t *this,
+ xlator_t *subvol, loc_t *loc)
+{
+ call_frame_t *unlink_frame = NULL;
+ dht_local_t *unlink_local = NULL;
+
+ unlink_frame = copy_frame (frame);
+ if (!unlink_frame) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "memory allocation failed :(");
+ goto err;
+ }
+
+ unlink_local = dht_local_init (unlink_frame);
+ if (!unlink_local) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "memory allocation failed :(");
+ goto err;
+ }
+
+ loc_copy (&unlink_local->loc, loc);
+
+ STACK_WIND (unlink_frame, dht_linkfile_unlink_cbk,
+ subvol, subvol->fops->unlink,
+ &unlink_local->loc);
+
+ return 0;
+err:
+ if (unlink_frame)
+ DHT_STACK_DESTROY (unlink_frame);
+
+ return -1;
+}
+
+
+xlator_t *
+dht_linkfile_subvol (xlator_t *this, inode_t *inode, struct stat *stbuf,
+ dict_t *xattr)
+{
+ dht_conf_t *conf = NULL;
+ xlator_t *subvol = NULL;
+ void *volname = NULL;
+ int i = 0, ret = 0;
+
+
+ conf = this->private;
+
+ if (!xattr)
+ goto out;
+
+ ret = dict_get_ptr (xattr, "trusted.glusterfs.dht.linkto", &volname);
+
+ if ((-1 == ret) || !volname)
+ goto out;
+
+ for (i = 0; i < conf->subvolume_cnt; i++) {
+ if (strcmp (conf->subvolumes[i]->name, (char *)volname) == 0) {
+ subvol = conf->subvolumes[i];
+ break;
+ }
+ }
+
+out:
+ return subvol;
+}
+
+