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-rw-r--r--xlators/cluster/afr/src/afr-dir-read.c345
1 files changed, 345 insertions, 0 deletions
diff --git a/xlators/cluster/afr/src/afr-dir-read.c b/xlators/cluster/afr/src/afr-dir-read.c
new file mode 100644
index 00000000000..0c65ca8528d
--- /dev/null
+++ b/xlators/cluster/afr/src/afr-dir-read.c
@@ -0,0 +1,345 @@
+/*
+ Copyright (c) 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/>.
+*/
+
+
+#include <libgen.h>
+#include <unistd.h>
+#include <fnmatch.h>
+#include <sys/time.h>
+#include <stdlib.h>
+#include <signal.h>
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "dict.h"
+#include "xlator.h"
+#include "hashfn.h"
+#include "logging.h"
+#include "stack.h"
+#include "list.h"
+#include "call-stub.h"
+#include "defaults.h"
+#include "common-utils.h"
+#include "compat-errno.h"
+#include "compat.h"
+
+#include "afr.h"
+
+
+int32_t
+afr_opendir_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret, int32_t op_errno,
+ fd_t *fd)
+{
+ afr_local_t * local = NULL;
+
+ int call_count = -1;
+
+ LOCK (&frame->lock);
+ {
+ local = frame->local;
+
+ if (op_ret == 0)
+ local->op_ret = 0;
+
+ local->op_errno = op_errno;
+ }
+ UNLOCK (&frame->lock);
+
+ call_count = afr_frame_return (frame);
+
+ if (call_count == 0) {
+ AFR_STACK_UNWIND (frame, local->op_ret,
+ local->op_errno, local->fd);
+ }
+
+ return 0;
+}
+
+
+int32_t
+afr_opendir (call_frame_t *frame, xlator_t *this,
+ loc_t *loc, fd_t *fd)
+{
+ afr_private_t * priv = NULL;
+ afr_local_t * local = NULL;
+
+ int child_count = 0;
+ int i = 0;
+
+ int ret = -1;
+ int call_count = -1;
+
+ int32_t op_ret = -1;
+ int32_t op_errno = 0;
+
+ VALIDATE_OR_GOTO (frame, out);
+ VALIDATE_OR_GOTO (this, out);
+ VALIDATE_OR_GOTO (this->private, out);
+
+ priv = this->private;
+
+ child_count = priv->child_count;
+
+ ALLOC_OR_GOTO (local, afr_local_t, out);
+ ret = AFR_LOCAL_INIT (local, priv);
+ if (ret < 0) {
+ op_errno = -ret;
+ goto out;
+ }
+
+ frame->local = local;
+ local->fd = fd_ref (fd);
+
+ call_count = local->call_count;
+
+ for (i = 0; i < child_count; i++) {
+ if (local->child_up[i]) {
+ STACK_WIND (frame, afr_opendir_cbk,
+ priv->children[i],
+ priv->children[i]->fops->opendir,
+ loc, fd);
+
+ if (!--call_count)
+ break;
+ }
+ }
+
+ op_ret = 0;
+out:
+ if (op_ret == -1) {
+ AFR_STACK_UNWIND (frame, op_ret, op_errno, fd);
+ }
+
+ return 0;
+}
+
+
+/**
+ * Common algorithm for directory read calls:
+ *
+ * - Try the fop on the first child that is up
+ * - if we have failed due to ENOTCONN:
+ * try the next child
+ *
+ * Applicable to: readdir
+ */
+
+int32_t
+afr_readdir_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret, int32_t op_errno,
+ gf_dirent_t *buf)
+{
+ afr_private_t * priv = NULL;
+ afr_local_t * local = NULL;
+ xlator_t ** children = NULL;
+
+ int unwind = 1;
+ int last_tried = -1;
+ int this_try = -1;
+
+ priv = this->private;
+ children = priv->children;
+
+ local = frame->local;
+
+ if (op_ret == -1) {
+ last_tried = local->cont.readdir.last_tried;
+
+ if (all_tried (last_tried, priv->child_count)) {
+ goto out;
+ }
+
+ this_try = ++local->cont.readdir.last_tried;
+ unwind = 0;
+
+ STACK_WIND (frame, afr_readdir_cbk,
+ children[this_try],
+ children[this_try]->fops->readdir,
+ local->fd, local->cont.readdir.size,
+ local->cont.readdir.offset);
+ }
+
+out:
+ if (unwind) {
+ AFR_STACK_UNWIND (frame, op_ret, op_errno, buf);
+ }
+
+ return 0;
+}
+
+
+int32_t
+afr_readdir (call_frame_t *frame, xlator_t *this,
+ fd_t *fd, size_t size, off_t offset)
+{
+ afr_private_t * priv = NULL;
+ xlator_t ** children = NULL;
+ int call_child = 0;
+ afr_local_t *local = NULL;
+
+ int ret = -1;
+
+ int32_t op_ret = -1;
+ int32_t op_errno = 0;
+
+ VALIDATE_OR_GOTO (frame, out);
+ VALIDATE_OR_GOTO (this, out);
+ VALIDATE_OR_GOTO (this->private, out);
+
+ priv = this->private;
+ children = priv->children;
+
+ ALLOC_OR_GOTO (local, afr_local_t, out);
+ ret = AFR_LOCAL_INIT (local, priv);
+ if (ret < 0) {
+ op_errno = -ret;
+ goto out;
+ }
+
+ frame->local = local;
+
+ call_child = afr_first_up_child (priv);
+ if (call_child == -1) {
+ op_errno = ENOTCONN;
+ gf_log (this->name, GF_LOG_ERROR,
+ "no child is up :(");
+ goto out;
+ }
+
+ local->cont.readdir.last_tried = call_child;
+
+ local->fd = fd_ref (fd);
+ local->cont.readdir.size = size;
+ local->cont.readdir.offset = offset;
+
+ STACK_WIND (frame, afr_readdir_cbk,
+ children[call_child], children[call_child]->fops->readdir,
+ fd, size, offset);
+
+ op_ret = 0;
+out:
+ if (op_ret == -1) {
+ AFR_STACK_UNWIND (frame, op_ret, op_errno, NULL);
+ }
+ return 0;
+}
+
+
+int32_t
+afr_getdents_cbk (call_frame_t *frame, void *cookie,
+ xlator_t *this, int32_t op_ret, int32_t op_errno,
+ dir_entry_t *entry, int32_t count)
+{
+ afr_private_t * priv = NULL;
+ afr_local_t * local = NULL;
+ xlator_t ** children = NULL;
+
+ int unwind = 1;
+ int last_tried = -1;
+ int this_try = -1;
+
+ priv = this->private;
+ children = priv->children;
+
+ local = frame->local;
+
+ if (op_ret == -1) {
+ last_tried = local->cont.getdents.last_tried;
+
+ if (all_tried (last_tried, priv->child_count)) {
+ goto out;
+ }
+
+ this_try = ++local->cont.getdents.last_tried;
+ unwind = 0;
+
+ STACK_WIND (frame, afr_getdents_cbk,
+ children[this_try],
+ children[this_try]->fops->getdents,
+ local->fd, local->cont.getdents.size,
+ local->cont.getdents.offset, local->cont.getdents.flag);
+ }
+
+out:
+ if (unwind) {
+ AFR_STACK_UNWIND (frame, op_ret, op_errno, entry, count);
+ }
+
+ return 0;
+}
+
+
+int32_t
+afr_getdents (call_frame_t *frame, xlator_t *this,
+ fd_t *fd, size_t size, off_t offset, int32_t flag)
+{
+ afr_private_t * priv = NULL;
+ xlator_t ** children = NULL;
+ int call_child = 0;
+ afr_local_t *local = NULL;
+
+ int32_t op_ret = -1;
+ int32_t op_errno = 0;
+
+ VALIDATE_OR_GOTO (frame, out);
+ VALIDATE_OR_GOTO (this, out);
+ VALIDATE_OR_GOTO (this->private, out);
+
+ priv = this->private;
+ children = priv->children;
+
+ ALLOC_OR_GOTO (local, afr_local_t, out);
+
+ call_child = afr_first_up_child (priv);
+ if (call_child == -1) {
+ op_errno = ENOTCONN;
+ gf_log (this->name, GF_LOG_ERROR,
+ "no child is up :(");
+ goto out;
+ }
+
+ local->cont.getdents.last_tried = call_child;
+
+ local->fd = fd_ref (fd);
+
+ local->cont.getdents.size = size;
+ local->cont.getdents.offset = offset;
+ local->cont.getdents.flag = flag;
+
+ frame->local = local;
+
+ STACK_WIND (frame, afr_getdents_cbk,
+ children[call_child], children[call_child]->fops->getdents,
+ fd, size, offset, flag);
+
+ op_ret = 0;
+out:
+ if (op_ret == -1) {
+ AFR_STACK_UNWIND (frame, op_ret, op_errno, NULL);
+ }
+
+ return 0;
+}
+
+
generated by cgit (git 2.34.1) at 2024-11-11 14:02:59 +0000