Added all files

1 files changed, 399 insertions, 0 deletions

diff --git a/xlators/performance/symlink-cache/src/symlink-cache.c b/xlators/performance/symlink-cache/src/symlink-cache.c
new file mode 100644
index 000000000..fc207a627
--- /dev/null
+++ b/xlators/performance/symlink-cache/src/symlink-cache.c
@@ -0,0 +1,399 @@
+/*
+  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 "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "list.h"
+#include "compat.h"
+#include "compat-errno.h"
+#include "common-utils.h"
+
+struct symlink_cache {
+	time_t ctime;
+	char   *readlink;
+};
+
+
+static int
+symlink_inode_ctx_get (inode_t *inode, xlator_t *this, void **ctx)
+{
+	int ret = 0;
+	uint64_t tmp_ctx = 0;
+	ret = inode_ctx_get (inode, this, &tmp_ctx);
+	if (-1 == ret)
+		gf_log (this->name, GF_LOG_ERROR, "dict get failed");
+	else
+		*ctx = (void *)(long)tmp_ctx;
+
+	return 0;
+}
+
+
+static int
+symlink_inode_ctx_set (inode_t *inode, xlator_t *this, void *ctx)
+{
+	int ret = 0;
+	ret = inode_ctx_put (inode, this, (uint64_t)(long) ctx);
+	if (-1 == ret)
+		gf_log (this->name, GF_LOG_ERROR, "dict set failed");
+
+	return 0;
+}
+
+
+int
+sc_cache_update (xlator_t *this, inode_t *inode, const char *link)
+{
+	struct symlink_cache *sc = NULL;
+
+	symlink_inode_ctx_get (inode, this, VOID(&sc));
+	if (!sc)
+		return 0;
+
+	if (!sc->readlink) {
+		gf_log (this->name, GF_LOG_DEBUG,
+			"updating cache: %s", link);
+
+		sc->readlink = strdup (link);
+	} else {
+		gf_log (this->name, GF_LOG_DEBUG,
+			"not updating existing cache: %s with %s",
+			sc->readlink, link);
+	}
+
+	return 0;
+}
+
+
+int
+sc_cache_set (xlator_t *this, inode_t *inode, struct stat *buf,
+	      const char *link)
+{
+	struct symlink_cache *sc = NULL;
+	int                   ret = -1;
+	int                   need_set = 0;
+
+
+	symlink_inode_ctx_get (inode, this, VOID(&sc));
+	if (!sc) {
+		need_set = 1;
+		sc = CALLOC (1, sizeof (*sc));
+		if (!sc) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"out of memory :(");
+			goto err;
+		}
+	}
+
+	if (sc->readlink) {
+		gf_log (this->name, GF_LOG_DEBUG,
+			"replacing old cache: %s with new cache: %s",
+			sc->readlink, link);
+		FREE (sc->readlink);
+		sc->readlink = NULL;
+	}
+
+	if (link) {
+		sc->readlink = strdup (link);
+		if (!sc->readlink) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"out of memory :(");
+			goto err;
+		}
+	}
+
+	sc->ctime = buf->st_ctime;
+
+	gf_log (this->name, GF_LOG_DEBUG,
+		"setting symlink cache: %s", link);
+
+	if (need_set) {
+		ret = symlink_inode_ctx_set (inode, this, sc);
+
+		if (ret < 0) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"could not set inode context (%s)",
+				strerror (-ret));
+			goto err;
+		}
+	}
+
+	return 0;
+err:
+
+	if (sc) {
+		if (sc->readlink)
+			FREE (sc->readlink);
+		sc->readlink = NULL;
+		FREE (sc);
+	}
+
+	return -1;
+}
+
+
+int
+sc_cache_flush (xlator_t *this, inode_t *inode)
+{
+	struct symlink_cache *sc = NULL;
+
+	symlink_inode_ctx_get (inode, this, VOID(&sc));
+	if (!sc)
+		return 0;
+
+	if (sc->readlink) {
+		gf_log (this->name, GF_LOG_DEBUG,
+			"flushing cache: %s", sc->readlink);
+
+		FREE (sc->readlink);
+		sc->readlink = NULL;
+	}
+
+	FREE (sc);
+
+	return 0;
+}
+
+
+int
+sc_cache_validate (xlator_t *this, inode_t *inode, struct stat *buf)
+{
+	struct symlink_cache *sc = NULL;
+	uint64_t tmp_sc = 0;
+
+	if (!S_ISLNK (buf->st_mode)) {
+		sc_cache_flush (this, inode);
+		return 0;
+	}
+
+	symlink_inode_ctx_get (inode, this, VOID(&sc));
+
+	if (!sc) {
+		sc_cache_set (this, inode, buf, NULL);
+		inode_ctx_get (inode, this, &tmp_sc);
+
+		if (!sc) {
+			gf_log (this->name, GF_LOG_ERROR,
+				"out of memory :(");
+			return 0;
+		}
+		sc = (struct symlink_cache *)(long)tmp_sc;
+	}
+
+	if (sc->ctime == buf->st_ctime)
+		return 0;
+
+	/* STALE */
+	if (sc->readlink) {
+		gf_log (this->name, GF_LOG_DEBUG,
+			"flushing cache: %s", sc->readlink);
+
+		FREE (sc->readlink);
+		sc->readlink = NULL;
+	}
+
+	sc->ctime = buf->st_ctime;
+
+	return 0;
+}
+
+
+
+int
+sc_cache_get (xlator_t *this, inode_t *inode, char **link)
+{
+	struct symlink_cache *sc = NULL;
+
+	symlink_inode_ctx_get (inode, this, VOID(&sc));
+
+	if (!sc)
+		return 0;
+
+	if (link && sc->readlink)
+		*link = strdup (sc->readlink);
+	return 0;
+}
+
+
+int
+sc_readlink_cbk (call_frame_t *frame, void *cookie,
+		 xlator_t *this, int op_ret, int op_errno,
+		 const char *link)
+{
+	if (op_ret > 0)
+		sc_cache_update (this, frame->local, link);
+
+	inode_unref (frame->local);
+	frame->local = NULL;
+
+        STACK_UNWIND (frame, op_ret, op_errno, link);
+        return 0;
+}
+
+
+int
+sc_readlink (call_frame_t *frame, xlator_t *this,
+	     loc_t *loc, size_t size)
+{
+	char *link = NULL;
+
+	sc_cache_get (this, loc->inode, &link);
+
+	if (link) {
+		/* cache hit */
+		gf_log (this->name, GF_LOG_DEBUG,
+			"cache hit %s -> %s",
+			loc->path, link);
+		STACK_UNWIND (frame, strlen (link) + 1, 0, link);
+		FREE (link);
+		return 0;
+	}
+
+	frame->local = inode_ref (loc->inode);
+
+        STACK_WIND (frame, sc_readlink_cbk,
+                    FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readlink,
+                    loc, size);
+
+	return 0;
+}
+
+
+int
+sc_symlink_cbk (call_frame_t *frame, void *cookie,
+		xlator_t *this, int op_ret, int op_errno,
+		inode_t *inode, struct stat *buf)
+{
+	if (op_ret == 0) {
+		if (frame->local) {
+			sc_cache_set (this, inode, buf, frame->local);
+		}
+	}
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, buf);
+        return 0;
+}
+
+
+int
+sc_symlink (call_frame_t *frame, xlator_t *this,
+	    const char *dst, loc_t *src)
+{
+	frame->local = strdup (dst);
+
+        STACK_WIND (frame, sc_symlink_cbk,
+                    FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->symlink,
+                    dst, src);
+
+	return 0;
+}
+
+
+int
+sc_lookup_cbk (call_frame_t *frame, void *cookie,
+	       xlator_t *this, int op_ret, int op_errno,
+	       inode_t *inode, struct stat *buf, dict_t *xattr)
+{
+	if (op_ret == 0)
+		sc_cache_validate (this, inode, buf);
+	else
+		sc_cache_flush (this, inode);
+
+        STACK_UNWIND (frame, op_ret, op_errno, inode, buf, xattr);
+        return 0;
+}
+
+
+int
+sc_lookup (call_frame_t *frame, xlator_t *this,
+	   loc_t *loc, dict_t *xattr_req)
+{
+        STACK_WIND (frame, sc_lookup_cbk,
+                    FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->lookup,
+                    loc, xattr_req);
+
+        return 0;
+}
+
+
+int
+sc_forget (xlator_t *this,
+	   inode_t *inode)
+{
+	sc_cache_flush (this, inode);
+
+        return 0;
+}
+
+
+int32_t 
+init (xlator_t *this)
+{
+	
+        if (!this->children || this->children->next)
+        {
+                gf_log (this->name, GF_LOG_ERROR,
+                        "FATAL: volume (%s) not configured with exactly one "
+			"child", this->name);
+                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 = {
+	.lookup      = sc_lookup,
+	.symlink     = sc_symlink,
+	.readlink    = sc_readlink,
+};
+
+struct xlator_mops mops = {
+};
+
+struct xlator_cbks cbks = {
+        .forget  = sc_forget,
+};
+
+struct volume_options options[] = {
+	{ .key = {NULL} },
+};