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-rw-r--r--xlators/cluster/dht/src/dht-helper.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/xlators/cluster/dht/src/dht-helper.c b/xlators/cluster/dht/src/dht-helper.c
new file mode 100644
index 00000000..52d07200
--- /dev/null
+++ b/xlators/cluster/dht/src/dht-helper.c
@@ -0,0 +1,326 @@
+/*
+ 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 "dht-common.h"
+
+
+int
+dht_frame_return (call_frame_t *frame)
+{
+ dht_local_t *local = NULL;
+ int this_call_cnt = -1;
+
+ if (!frame)
+ return -1;
+
+ local = frame->local;
+
+ LOCK (&frame->lock);
+ {
+ this_call_cnt = --local->call_cnt;
+ }
+ UNLOCK (&frame->lock);
+
+ return this_call_cnt;
+}
+
+
+int
+dht_itransform (xlator_t *this, xlator_t *subvol, uint64_t x, uint64_t *y_p)
+{
+ dht_conf_t *conf = NULL;
+ int cnt = 0;
+ int max = 0;
+ uint64_t y = 0;
+
+
+ if (x == ((uint64_t) -1)) {
+ y = (uint64_t) -1;
+ goto out;
+ }
+
+ conf = this->private;
+
+ max = conf->subvolume_cnt;
+ cnt = dht_subvol_cnt (this, subvol);
+
+ y = ((x * max) + cnt);
+
+out:
+ if (y_p)
+ *y_p = y;
+
+ return 0;
+}
+
+
+int
+dht_deitransform (xlator_t *this, uint64_t y, xlator_t **subvol_p,
+ uint64_t *x_p)
+{
+ dht_conf_t *conf = NULL;
+ int cnt = 0;
+ int max = 0;
+ uint64_t x = 0;
+ xlator_t *subvol = 0;
+
+
+ conf = this->private;
+ max = conf->subvolume_cnt;
+
+ cnt = y % max;
+ x = y / max;
+
+ subvol = conf->subvolumes[cnt];
+
+ if (subvol_p)
+ *subvol_p = subvol;
+
+ if (x_p)
+ *x_p = x;
+
+ return 0;
+}
+
+
+void
+dht_local_wipe (dht_local_t *local)
+{
+ if (!local)
+ return;
+
+ loc_wipe (&local->loc);
+ loc_wipe (&local->loc2);
+
+ if (local->xattr)
+ dict_unref (local->xattr);
+
+ if (local->inode)
+ inode_unref (local->inode);
+
+ if (local->layout)
+ FREE (local->layout);
+
+ loc_wipe (&local->linkfile.loc);
+
+ if (local->linkfile.xattr)
+ dict_unref (local->linkfile.xattr);
+
+ if (local->linkfile.inode)
+ inode_unref (local->linkfile.inode);
+
+ if (local->fd) {
+ fd_unref (local->fd);
+ local->fd = NULL;
+ }
+
+ if (local->xattr_req)
+ dict_unref (local->xattr_req);
+
+ FREE (local);
+}
+
+
+dht_local_t *
+dht_local_init (call_frame_t *frame)
+{
+ dht_local_t *local = NULL;
+
+ /* TODO: use mem-pool */
+ local = CALLOC (1, sizeof (*local));
+
+ if (!local)
+ return NULL;
+
+ local->op_ret = -1;
+ local->op_errno = EUCLEAN;
+
+ frame->local = local;
+
+ return local;
+}
+
+
+char *
+basestr (const char *str)
+{
+ char *basestr = NULL;
+
+ basestr = strrchr (str, '/');
+ if (basestr)
+ basestr ++;
+
+ return basestr;
+}
+
+xlator_t *
+dht_first_up_child (xlator_t *this)
+{
+ dht_conf_t *conf = NULL;
+ xlator_t *child = NULL;
+ int i = 0;
+
+ conf = this->private;
+
+ LOCK (&conf->subvolume_lock);
+ {
+ for (i = 0; i < conf->subvolume_cnt; i++) {
+ if (conf->subvolume_status[i]) {
+ child = conf->subvolumes[i];
+ break;
+ }
+ }
+ }
+ UNLOCK (&conf->subvolume_lock);
+
+ return child;
+}
+
+xlator_t *
+dht_subvol_get_hashed (xlator_t *this, loc_t *loc)
+{
+ dht_layout_t *layout = NULL;
+ xlator_t *subvol = NULL;
+
+ if (is_fs_root (loc)) {
+ subvol = dht_first_up_child (this);
+ goto out;
+ }
+
+ layout = dht_layout_get (this, loc->parent);
+
+ if (!layout) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "layout missing path=%s parent=%"PRId64,
+ loc->path, loc->parent->ino);
+ goto out;
+ }
+
+ subvol = dht_layout_search (this, layout, loc->name);
+
+ if (!subvol) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "could not find subvolume for path=%s",
+ loc->path);
+ goto out;
+ }
+
+out:
+ return subvol;
+}
+
+
+xlator_t *
+dht_subvol_get_cached (xlator_t *this, inode_t *inode)
+{
+ dht_layout_t *layout = NULL;
+ xlator_t *subvol = NULL;
+
+
+ layout = dht_layout_get (this, inode);
+
+ if (!layout) {
+ goto out;
+ }
+
+ subvol = layout->list[0].xlator;
+
+out:
+ return subvol;
+}
+
+
+xlator_t *
+dht_subvol_next (xlator_t *this, xlator_t *prev)
+{
+ dht_conf_t *conf = NULL;
+ int i = 0;
+ xlator_t *next = NULL;
+
+ conf = this->private;
+
+ for (i = 0; i < conf->subvolume_cnt; i++) {
+ if (conf->subvolumes[i] == prev) {
+ if ((i + 1) < conf->subvolume_cnt)
+ next = conf->subvolumes[i + 1];
+ break;
+ }
+ }
+
+ return next;
+}
+
+
+int
+dht_subvol_cnt (xlator_t *this, xlator_t *subvol)
+{
+ int i = 0;
+ int ret = -1;
+ dht_conf_t *conf = NULL;
+
+
+ conf = this->private;
+
+ for (i = 0; i < conf->subvolume_cnt; i++) {
+ if (subvol == conf->subvolumes[i]) {
+ ret = i;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+
+#define set_if_greater(a, b) do { \
+ if ((a) < (b)) \
+ (a) = (b); \
+ } while (0)
+
+int
+dht_stat_merge (xlator_t *this, struct stat *to,
+ struct stat *from, xlator_t *subvol)
+{
+ to->st_dev = from->st_dev;
+
+ dht_itransform (this, subvol, from->st_ino, &to->st_ino);
+
+ to->st_mode = from->st_mode;
+ to->st_nlink = from->st_nlink;
+ to->st_uid = from->st_uid;
+ to->st_gid = from->st_gid;
+ to->st_rdev = from->st_rdev;
+ to->st_size += from->st_size;
+ to->st_blksize = from->st_blksize;
+ to->st_blocks += from->st_blocks;
+
+ set_if_greater (to->st_atime, from->st_atime);
+ set_if_greater (to->st_mtime, from->st_mtime);
+ set_if_greater (to->st_ctime, from->st_ctime);
+
+ return 0;
+}