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authorVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
committerVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
commit77adf4cd648dce41f89469dd185deec6b6b53a0b (patch)
tree02e155a5753b398ee572b45793f889b538efab6b /xlators/performance/io-cache/src
parentf3b2e6580e5663292ee113c741343c8a43ee133f (diff)
Added all files
Diffstat (limited to 'xlators/performance/io-cache/src')
-rw-r--r--xlators/performance/io-cache/src/Makefile.am14
-rw-r--r--xlators/performance/io-cache/src/io-cache.c1478
-rw-r--r--xlators/performance/io-cache/src/io-cache.h330
-rw-r--r--xlators/performance/io-cache/src/ioc-inode.c201
-rw-r--r--xlators/performance/io-cache/src/page.c778
5 files changed, 2801 insertions, 0 deletions
diff --git a/xlators/performance/io-cache/src/Makefile.am b/xlators/performance/io-cache/src/Makefile.am
new file mode 100644
index 000000000..b1bf5bfbf
--- /dev/null
+++ b/xlators/performance/io-cache/src/Makefile.am
@@ -0,0 +1,14 @@
+xlator_LTLIBRARIES = io-cache.la
+xlatordir = $(libdir)/glusterfs/$(PACKAGE_VERSION)/xlator/performance
+
+io_cache_la_LDFLAGS = -module -avoidversion
+
+io_cache_la_SOURCES = io-cache.c page.c ioc-inode.c
+io_cache_la_LIBADD = $(top_builddir)/libglusterfs/src/libglusterfs.la
+
+noinst_HEADERS = io-cache.h
+
+AM_CFLAGS = -fPIC -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE -Wall -D$(GF_HOST_OS) \
+ -I$(top_srcdir)/libglusterfs/src -shared -nostartfiles $(GF_CFLAGS)
+
+CLEANFILES =
diff --git a/xlators/performance/io-cache/src/io-cache.c b/xlators/performance/io-cache/src/io-cache.c
new file mode 100644
index 000000000..f367cdb88
--- /dev/null
+++ b/xlators/performance/io-cache/src/io-cache.c
@@ -0,0 +1,1478 @@
+/*
+ Copyright (c) 2007, 2008, 2009 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 "io-cache.h"
+#include <assert.h>
+#include <sys/time.h>
+
+static uint32_t
+ioc_get_priority (ioc_table_t *table,
+ const char *path);
+
+static uint32_t
+ioc_get_priority (ioc_table_t *table,
+ const char *path);
+
+static inline ioc_inode_t *
+ioc_inode_reupdate (ioc_inode_t *ioc_inode)
+{
+ ioc_table_t *table = ioc_inode->table;
+
+ list_add_tail (&ioc_inode->inode_lru,
+ &table->inode_lru[ioc_inode->weight]);
+
+ return ioc_inode;
+}
+
+static inline ioc_inode_t *
+ioc_get_inode (dict_t *dict,
+ char *name)
+{
+ ioc_inode_t *ioc_inode = NULL;
+ data_t *ioc_inode_data = dict_get (dict, name);
+ ioc_table_t *table = NULL;
+
+ if (ioc_inode_data) {
+ ioc_inode = data_to_ptr (ioc_inode_data);
+ table = ioc_inode->table;
+
+ ioc_table_lock (table);
+ {
+ if (list_empty (&ioc_inode->inode_lru)) {
+ ioc_inode = ioc_inode_reupdate (ioc_inode);
+ }
+ }
+ ioc_table_unlock (table);
+ }
+
+ return ioc_inode;
+}
+
+int32_t
+ioc_inode_need_revalidate (ioc_inode_t *ioc_inode)
+{
+ int8_t need_revalidate = 0;
+ struct timeval tv = {0,};
+ int32_t ret = -1;
+ ioc_table_t *table = ioc_inode->table;
+
+ ret = gettimeofday (&tv, NULL);
+
+ if (time_elapsed (&tv, &ioc_inode->tv) >= table->cache_timeout)
+ need_revalidate = 1;
+
+ return need_revalidate;
+}
+
+/*
+ * __ioc_inode_flush - flush all the cached pages of the given inode
+ *
+ * @ioc_inode:
+ *
+ * assumes lock is held
+ */
+int32_t
+__ioc_inode_flush (ioc_inode_t *ioc_inode)
+{
+ ioc_page_t *curr = NULL, *next = NULL;
+ int32_t destroy_size = 0;
+ int32_t ret = 0;
+
+ list_for_each_entry_safe (curr, next, &ioc_inode->pages, pages) {
+ ret = ioc_page_destroy (curr);
+
+ if (ret != -1)
+ destroy_size += ret;
+ }
+
+ return destroy_size;
+}
+
+void
+ioc_inode_flush (ioc_inode_t *ioc_inode)
+{
+ int32_t destroy_size = 0;
+
+ ioc_inode_lock (ioc_inode);
+ {
+ destroy_size = __ioc_inode_flush (ioc_inode);
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ if (destroy_size) {
+ ioc_table_lock (ioc_inode->table);
+ {
+ ioc_inode->table->cache_used -= destroy_size;
+ }
+ ioc_table_unlock (ioc_inode->table);
+ }
+
+ return;
+}
+
+/*
+ * ioc_utimens_cbk -
+ *
+ * @frame:
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @stbuf:
+ *
+ */
+int32_t
+ioc_utimens_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *stbuf)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, stbuf);
+ return 0;
+}
+
+/*
+ * ioc_utimens -
+ *
+ * @frame:
+ * @this:
+ * @loc:
+ * @tv:
+ *
+ */
+int32_t
+ioc_utimens (call_frame_t *frame,
+ xlator_t *this,
+ loc_t *loc,
+ struct timespec *tv)
+{
+ uint64_t ioc_inode = 0;
+ inode_ctx_get (loc->inode, this, &ioc_inode);
+
+ if (ioc_inode)
+ ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+ STACK_WIND (frame, ioc_utimens_cbk,
+ FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->utimens,
+ loc, tv);
+ return 0;
+}
+
+int32_t
+ioc_lookup_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ inode_t *inode,
+ struct stat *stbuf,
+ dict_t *dict)
+{
+ ioc_inode_t *ioc_inode = NULL;
+ ioc_local_t *local = frame->local;
+ ioc_table_t *table = this->private;
+ ioc_page_t *page = NULL;
+ data_t *page_data = NULL;
+ data_t *content_data = NULL;
+ char *src = NULL;
+ char *dst = NULL;
+ char need_unref = 0;
+ uint8_t cache_still_valid = 0;
+ uint32_t weight = 0;
+ uint64_t tmp_ioc_inode = 0;
+ char *buf = NULL;
+ char *tmp = NULL;
+ int i;
+
+ if (op_ret != 0)
+ goto out;
+
+ inode_ctx_get (inode, this, &tmp_ioc_inode);
+ ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode;
+ if (ioc_inode) {
+ cache_still_valid = ioc_cache_still_valid (ioc_inode,
+ stbuf);
+
+ if (!cache_still_valid) {
+ ioc_inode_flush (ioc_inode);
+ }
+ /* update the time-stamp of revalidation */
+ ioc_inode_lock (ioc_inode);
+ {
+ gettimeofday (&ioc_inode->tv, NULL);
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ ioc_table_lock (ioc_inode->table);
+ {
+ list_move_tail (&ioc_inode->inode_lru,
+ &table->inode_lru[ioc_inode->weight]);
+ }
+ ioc_table_unlock (ioc_inode->table);
+ }
+
+ if (local && stbuf->st_size &&
+ local->need_xattr >= stbuf->st_size) {
+ if (!ioc_inode) {
+ weight = ioc_get_priority (table,
+ local->file_loc.path);
+ ioc_inode = ioc_inode_update (table,
+ inode, weight);
+ inode_ctx_put (inode, this,
+ (uint64_t)(long)ioc_inode);
+ }
+
+ ioc_inode_lock (ioc_inode);
+ {
+ content_data = dict_get (dict, "glusterfs.content");
+ page = ioc_page_get (ioc_inode, 0);
+
+ if (content_data) {
+ if (page) {
+ dict_unref (page->ref);
+ free (page->vector);
+ page->vector = NULL;
+
+ ioc_table_lock (table);
+ {
+ table->cache_used -=
+ page->size;
+ }
+ ioc_table_unlock (table);
+ } else {
+ page = ioc_page_create (ioc_inode, 0);
+ }
+
+ dst = CALLOC (1, stbuf->st_size);
+ page->ref = dict_ref (get_new_dict ());
+ page_data = data_from_dynptr (dst,
+ stbuf->st_size);
+ dict_set (page->ref, NULL, page_data);
+
+ src = data_to_ptr (content_data);
+ memcpy (dst, src, stbuf->st_size);
+
+ page->vector = CALLOC (1,
+ sizeof (*page->vector));
+ page->vector->iov_base = dst;
+ page->vector->iov_len = stbuf->st_size;
+ page->count = 1;
+
+ page->waitq = NULL;
+ page->size = stbuf->st_size;
+ page->ready = 1;
+
+ ioc_table_lock (table);
+ {
+ table->cache_used += page->size;
+ }
+ ioc_table_unlock (table);
+
+ } else {
+ if (!(page && page->ready)) {
+ gf_log (this->name, GF_LOG_DEBUG,
+ "page not present");
+
+ ioc_inode_unlock (ioc_inode);
+ STACK_WIND (frame,
+ ioc_lookup_cbk,
+ FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->lookup,
+ &local->file_loc,
+ local->xattr_req);
+ return 0;
+ }
+ buf = CALLOC (1, stbuf->st_size);
+ tmp = buf;
+
+ for (i = 0; i < page->count; i++) {
+ memcpy (tmp, page->vector[i].iov_base,
+ page->vector[i].iov_len);
+ tmp += page->vector[i].iov_len;
+ }
+
+ gf_log (this->name, GF_LOG_DEBUG,
+ "serving file %s from cache",
+ local->file_loc.path);
+
+ if (!dict) {
+ need_unref = 1;
+ dict = dict_ref (
+ get_new_dict ());
+ }
+ dict_set (dict, "glusterfs.content",
+ data_from_dynptr (buf,
+ stbuf->st_size));
+ }
+
+ ioc_inode->mtime = stbuf->st_mtime;
+ gettimeofday (&ioc_inode->tv, NULL);
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ if (content_data &&
+ ioc_need_prune (ioc_inode->table)) {
+ ioc_prune (ioc_inode->table);
+ }
+ }
+
+ out:
+ STACK_UNWIND (frame, op_ret, op_errno, inode, stbuf, dict);
+
+ if (need_unref) {
+ dict_unref (dict);
+ }
+
+ return 0;
+}
+
+int32_t
+ioc_lookup (call_frame_t *frame,
+ xlator_t *this,
+ loc_t *loc,
+ dict_t *xattr_req)
+{
+ uint64_t content_limit = 0;
+
+ if (GF_FILE_CONTENT_REQUESTED(xattr_req, &content_limit)) {
+ uint64_t tmp_ioc_inode = 0;
+ ioc_inode_t *ioc_inode = NULL;
+ ioc_page_t *page = NULL;
+ ioc_local_t *local = CALLOC (1, sizeof (*local));
+
+ local->need_xattr = content_limit;
+ local->file_loc.path = loc->path;
+ local->file_loc.inode = loc->inode;
+ frame->local = local;
+
+ inode_ctx_get (loc->inode, this, &tmp_ioc_inode);
+ ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode;
+
+ if (ioc_inode) {
+ ioc_inode_lock (ioc_inode);
+ {
+ page = ioc_page_get (ioc_inode, 0);
+ if ((content_limit <=
+ ioc_inode->table->page_size) &&
+ page && page->ready) {
+ local->need_xattr = -1;
+ }
+ }
+ ioc_inode_unlock (ioc_inode);
+ }
+ }
+
+ STACK_WIND (frame,
+ ioc_lookup_cbk,
+ FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->lookup,
+ loc,
+ xattr_req);
+ return 0;
+}
+
+/*
+ * ioc_forget -
+ *
+ * @frame:
+ * @this:
+ * @inode:
+ *
+ */
+int32_t
+ioc_forget (xlator_t *this,
+ inode_t *inode)
+{
+ uint64_t ioc_inode = 0;
+
+ inode_ctx_get (inode, this, &ioc_inode);
+
+ if (ioc_inode)
+ ioc_inode_destroy ((ioc_inode_t *)(long)ioc_inode);
+
+ return 0;
+}
+
+
+/*
+ * ioc_cache_validate_cbk -
+ *
+ * @frame:
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @buf
+ *
+ */
+int32_t
+ioc_cache_validate_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *stbuf)
+{
+ ioc_local_t *local = frame->local;
+ ioc_inode_t *ioc_inode = NULL;
+ size_t destroy_size = 0;
+ struct stat *local_stbuf = stbuf;
+
+ ioc_inode = local->inode;
+
+ if ((op_ret == -1) ||
+ ((op_ret >= 0) && !ioc_cache_still_valid(ioc_inode, stbuf))) {
+ gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG,
+ "cache for inode(%p) is invalid. flushing all pages",
+ ioc_inode);
+ /* NOTE: only pages with no waiting frames are flushed by
+ * ioc_inode_flush. page_fault will be generated for all
+ * the pages which have waiting frames by ioc_inode_wakeup()
+ */
+ ioc_inode_lock (ioc_inode);
+ {
+ destroy_size = __ioc_inode_flush (ioc_inode);
+ if (op_ret >= 0)
+ ioc_inode->mtime = stbuf->st_mtime;
+ }
+ ioc_inode_unlock (ioc_inode);
+ local_stbuf = NULL;
+ }
+
+ if (destroy_size) {
+ ioc_table_lock (ioc_inode->table);
+ {
+ ioc_inode->table->cache_used -= destroy_size;
+ }
+ ioc_table_unlock (ioc_inode->table);
+ }
+
+ if (op_ret < 0)
+ local_stbuf = NULL;
+
+ ioc_inode_lock (ioc_inode);
+ {
+ gettimeofday (&ioc_inode->tv, NULL);
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ ioc_inode_wakeup (frame, ioc_inode, local_stbuf);
+
+ /* any page-fault initiated by ioc_inode_wakeup() will have its own
+ * fd_ref on fd, safe to unref validate frame's private copy
+ */
+ fd_unref (local->fd);
+
+ STACK_DESTROY (frame->root);
+
+ return 0;
+}
+
+static int32_t
+ioc_wait_on_inode (ioc_inode_t *ioc_inode,
+ ioc_page_t *page)
+{
+ ioc_waitq_t *waiter = NULL, *trav = NULL;
+ uint32_t page_found = 0;
+
+ trav = ioc_inode->waitq;
+
+ while (trav) {
+ if (trav->data == page) {
+ page_found = 1;
+ break;
+ }
+ trav = trav->next;
+ }
+
+ if (!page_found) {
+ waiter = CALLOC (1, sizeof (ioc_waitq_t));
+ ERR_ABORT (waiter);
+ waiter->data = page;
+ waiter->next = ioc_inode->waitq;
+ ioc_inode->waitq = waiter;
+ }
+
+ return 0;
+}
+
+/*
+ * ioc_cache_validate -
+ *
+ * @frame:
+ * @ioc_inode:
+ * @fd:
+ *
+ */
+static int32_t
+ioc_cache_validate (call_frame_t *frame,
+ ioc_inode_t *ioc_inode,
+ fd_t *fd,
+ ioc_page_t *page)
+{
+ call_frame_t *validate_frame = NULL;
+ ioc_local_t *validate_local = NULL;
+
+ validate_local = CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (validate_local);
+ validate_frame = copy_frame (frame);
+ validate_local->fd = fd_ref (fd);
+ validate_local->inode = ioc_inode;
+ validate_frame->local = validate_local;
+
+ STACK_WIND (validate_frame,
+ ioc_cache_validate_cbk,
+ FIRST_CHILD (frame->this),
+ FIRST_CHILD (frame->this)->fops->fstat,
+ fd);
+
+ return 0;
+}
+
+static inline uint32_t
+is_match (const char *path,
+ const char *pattern)
+{
+ char *pathname = strdup (path);
+ int32_t ret = 0;
+
+ ret = fnmatch (pattern, path, FNM_NOESCAPE);
+
+ free (pathname);
+
+ return (ret == 0);
+}
+
+static uint32_t
+ioc_get_priority (ioc_table_t *table,
+ const char *path)
+{
+ uint32_t priority = 0;
+ struct ioc_priority *curr = NULL;
+
+ list_for_each_entry (curr, &table->priority_list, list) {
+ if (is_match (path, curr->pattern))
+ priority = curr->priority;
+ }
+
+ return priority;
+}
+
+/*
+ * ioc_open_cbk - open callback for io cache
+ *
+ * @frame: call frame
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @fd:
+ *
+ */
+int32_t
+ioc_open_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ fd_t *fd)
+{
+ uint64_t tmp_ioc_inode = 0;
+ ioc_local_t *local = frame->local;
+ ioc_table_t *table = this->private;
+ ioc_inode_t *ioc_inode = NULL;
+ inode_t *inode = local->file_loc.inode;
+ uint32_t weight = 0;
+ const char *path = local->file_loc.path;
+
+ if (op_ret != -1) {
+ /* look for ioc_inode corresponding to this fd */
+ LOCK (&fd->inode->lock);
+ //{
+
+ inode_ctx_get (fd->inode, this, &tmp_ioc_inode);
+ ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode;
+
+ if (!ioc_inode) {
+ /* this is the first time someone is opening this
+ file, assign weight
+ */
+ weight = ioc_get_priority (table, path);
+
+ ioc_inode = ioc_inode_update (table, inode, weight);
+ inode_ctx_put (fd->inode, this,
+ (uint64_t)(long)ioc_inode);
+ } else {
+ ioc_table_lock (ioc_inode->table);
+ //{
+ list_move_tail (&ioc_inode->inode_lru,
+ &table->inode_lru[ioc_inode->weight]);
+ //}
+ ioc_table_unlock (ioc_inode->table);
+ }
+
+ //}
+ UNLOCK (&fd->inode->lock);
+
+ /* If mandatory locking has been enabled on this file,
+ we disable caching on it */
+ if (((inode->st_mode & S_ISGID) &&
+ !(inode->st_mode & S_IXGRP))) {
+ fd_ctx_set (fd, this, 1);
+ }
+
+ /* If O_DIRECT open, we disable caching on it */
+ if ((local->flags & O_DIRECT)){
+ /* O_DIRECT is only for one fd, not the inode
+ * as a whole
+ */
+ fd_ctx_set (fd, this, 1);
+ }
+ }
+
+ FREE (local);
+ frame->local = NULL;
+
+ STACK_UNWIND (frame, op_ret, op_errno, fd);
+
+ return 0;
+}
+
+/*
+ * ioc_create_cbk - create callback for io cache
+ *
+ * @frame: call frame
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @fd:
+ * @inode:
+ * @buf:
+ *
+ */
+int32_t
+ioc_create_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ fd_t *fd,
+ inode_t *inode,
+ struct stat *buf)
+{
+ ioc_local_t *local = frame->local;
+ ioc_table_t *table = this->private;
+ ioc_inode_t *ioc_inode = NULL;
+ uint32_t weight = 0;
+ const char *path = local->file_loc.path;
+
+ if (op_ret != -1) {
+ {
+ /* assign weight */
+ weight = ioc_get_priority (table, path);
+
+ ioc_inode = ioc_inode_update (table, inode, weight);
+ LOCK (&fd->inode->lock);
+ {
+ inode_ctx_put (fd->inode, this,
+ (uint64_t)(long)ioc_inode);
+ }
+ UNLOCK (&fd->inode->lock);
+ }
+ /* If mandatory locking has been enabled on this file,
+ we disable caching on it */
+ if ((inode->st_mode & S_ISGID) &&
+ !(inode->st_mode & S_IXGRP)) {
+ fd_ctx_set (fd, this, 1);
+ }
+
+ /* If O_DIRECT open, we disable caching on it */
+ if (local->flags & O_DIRECT){
+ /* O_DIRECT is only for one fd, not the inode
+ * as a whole
+ */
+ fd_ctx_set (fd, this, 1);
+ }
+
+ }
+
+ frame->local = NULL;
+ FREE (local);
+
+ STACK_UNWIND (frame, op_ret, op_errno, fd, inode, buf);
+
+ return 0;
+}
+
+/*
+ * ioc_open - open fop for io cache
+ * @frame:
+ * @this:
+ * @loc:
+ * @flags:
+ *
+ */
+int32_t
+ioc_open (call_frame_t *frame,
+ xlator_t *this,
+ loc_t *loc,
+ int32_t flags,
+ fd_t *fd)
+{
+
+ ioc_local_t *local = CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (local);
+
+ local->flags = flags;
+ local->file_loc.path = loc->path;
+ local->file_loc.inode = loc->inode;
+
+ frame->local = local;
+
+ STACK_WIND (frame,
+ ioc_open_cbk,
+ FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->open,
+ loc,
+ flags,
+ fd);
+
+ return 0;
+}
+
+/*
+ * ioc_create - create fop for io cache
+ *
+ * @frame:
+ * @this:
+ * @pathname:
+ * @flags:
+ * @mode:
+ *
+ */
+int32_t
+ioc_create (call_frame_t *frame,
+ xlator_t *this,
+ loc_t *loc,
+ int32_t flags,
+ mode_t mode,
+ fd_t *fd)
+{
+ ioc_local_t *local = CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (local);
+
+ local->flags = flags;
+ local->file_loc.path = loc->path;
+ frame->local = local;
+
+ STACK_WIND (frame, ioc_create_cbk,
+ FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->create,
+ loc, flags, mode, fd);
+ return 0;
+}
+
+
+
+
+/*
+ * ioc_release - release fop for io cache
+ *
+ * @frame:
+ * @this:
+ * @fd:
+ *
+ */
+int32_t
+ioc_release (xlator_t *this,
+ fd_t *fd)
+{
+ return 0;
+}
+
+/*
+ * ioc_readv_disabled_cbk
+ * @frame:
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @vector:
+ * @count:
+ *
+ */
+int32_t
+ioc_readv_disabled_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct iovec *vector,
+ int32_t count,
+ struct stat *stbuf)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, vector, count, stbuf);
+ return 0;
+}
+
+
+int32_t
+ioc_need_prune (ioc_table_t *table)
+{
+ int64_t cache_difference = 0;
+
+ ioc_table_lock (table);
+ {
+ cache_difference = table->cache_used - table->cache_size;
+ }
+ ioc_table_unlock (table);
+
+ if (cache_difference > 0)
+ return 1;
+ else
+ return 0;
+}
+
+/*
+ * dispatch_requests -
+ *
+ * @frame:
+ * @inode:
+ *
+ *
+ */
+static void
+dispatch_requests (call_frame_t *frame,
+ ioc_inode_t *ioc_inode,
+ fd_t *fd,
+ off_t offset,
+ size_t size)
+{
+ ioc_local_t *local = frame->local;
+ ioc_table_t *table = ioc_inode->table;
+ ioc_page_t *trav = NULL;
+ ioc_waitq_t *waitq = NULL;
+ off_t rounded_offset = 0;
+ off_t rounded_end = 0;
+ off_t trav_offset = 0;
+ int32_t fault = 0;
+ int8_t need_validate = 0;
+ int8_t might_need_validate = 0; /* if a page exists, do we need
+ to validate it? */
+
+ rounded_offset = floor (offset, table->page_size);
+ rounded_end = roof (offset + size, table->page_size);
+ trav_offset = rounded_offset;
+
+ /* once a frame does read, it should be waiting on something */
+ local->wait_count++;
+
+ /* Requested region can fall in three different pages,
+ * 1. Ready - region is already in cache, we just have to serve it.
+ * 2. In-transit - page fault has been generated on this page, we need
+ * to wait till the page is ready
+ * 3. Fault - page is not in cache, we have to generate a page fault
+ */
+
+ might_need_validate = ioc_inode_need_revalidate (ioc_inode);
+
+ while (trav_offset < rounded_end) {
+ size_t trav_size = 0;
+ off_t local_offset = 0;
+
+ ioc_inode_lock (ioc_inode);
+ //{
+
+ /* look for requested region in the cache */
+ trav = ioc_page_get (ioc_inode, trav_offset);
+
+ local_offset = max (trav_offset, offset);
+ trav_size = min (((offset+size) - local_offset),
+ table->page_size);
+
+ if (!trav) {
+ /* page not in cache, we need to generate page fault */
+ trav = ioc_page_create (ioc_inode, trav_offset);
+ fault = 1;
+ if (!trav) {
+ gf_log (frame->this->name, GF_LOG_CRITICAL,
+ "ioc_page_create returned NULL");
+ }
+ }
+
+ ioc_wait_on_page (trav, frame, local_offset, trav_size);
+
+ if (trav->ready) {
+ /* page found in cache */
+ if (!might_need_validate) {
+ /* fresh enough */
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "cache hit for trav_offset=%"PRId64""
+ "/local_offset=%"PRId64"",
+ trav_offset, local_offset);
+ waitq = ioc_page_wakeup (trav);
+ } else {
+ /* if waitq already exists, fstat revalidate is
+ already on the way */
+ if (!ioc_inode->waitq) {
+ need_validate = 1;
+ }
+ ioc_wait_on_inode (ioc_inode, trav);
+ }
+ }
+
+ //}
+ ioc_inode_unlock (ioc_inode);
+
+ ioc_waitq_return (waitq);
+ waitq = NULL;
+
+ if (fault) {
+ fault = 0;
+ /* new page created, increase the table->cache_used */
+ ioc_page_fault (ioc_inode, frame, fd, trav_offset);
+ }
+
+ if (need_validate) {
+ need_validate = 0;
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "sending validate request for "
+ "inode(%"PRId64") at offset=%"PRId64"",
+ fd->inode->ino, trav_offset);
+ ioc_cache_validate (frame, ioc_inode, fd, trav);
+ }
+
+ trav_offset += table->page_size;
+ }
+
+ ioc_frame_return (frame);
+
+ if (ioc_need_prune (ioc_inode->table)) {
+ ioc_prune (ioc_inode->table);
+ }
+
+ return;
+}
+
+
+/*
+ * ioc_readv -
+ *
+ * @frame:
+ * @this:
+ * @fd:
+ * @size:
+ * @offset:
+ *
+ */
+int32_t
+ioc_readv (call_frame_t *frame,
+ xlator_t *this,
+ fd_t *fd,
+ size_t size,
+ off_t offset)
+{
+ uint64_t tmp_ioc_inode = 0;
+ ioc_inode_t *ioc_inode = NULL;
+ ioc_local_t *local = NULL;
+ uint32_t weight = 0;
+
+ inode_ctx_get (fd->inode, this, &tmp_ioc_inode);
+ ioc_inode = (ioc_inode_t *)(long)tmp_ioc_inode;
+ if (!ioc_inode) {
+ /* caching disabled, go ahead with normal readv */
+ STACK_WIND (frame,
+ ioc_readv_disabled_cbk,
+ FIRST_CHILD (frame->this),
+ FIRST_CHILD (frame->this)->fops->readv,
+ fd,
+ size,
+ offset);
+ return 0;
+ }
+
+ if (!fd_ctx_get (fd, this, NULL)) {
+ /* disable caching for this fd, go ahead with normal readv */
+ STACK_WIND (frame,
+ ioc_readv_disabled_cbk,
+ FIRST_CHILD (frame->this),
+ FIRST_CHILD (frame->this)->fops->readv,
+ fd,
+ size,
+ offset);
+ return 0;
+ }
+
+ local = (ioc_local_t *) CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (local);
+ INIT_LIST_HEAD (&local->fill_list);
+
+ frame->local = local;
+ local->pending_offset = offset;
+ local->pending_size = size;
+ local->offset = offset;
+ local->size = size;
+ local->inode = ioc_inode;
+
+ gf_log (this->name, GF_LOG_DEBUG,
+ "NEW REQ (%p) offset = %"PRId64" && size = %"GF_PRI_SIZET"",
+ frame, offset, size);
+
+ weight = ioc_inode->weight;
+
+ ioc_table_lock (ioc_inode->table);
+ {
+ list_move_tail (&ioc_inode->inode_lru,
+ &ioc_inode->table->inode_lru[weight]);
+ }
+ ioc_table_unlock (ioc_inode->table);
+
+ dispatch_requests (frame, ioc_inode, fd, offset, size);
+
+ return 0;
+}
+
+/*
+ * ioc_writev_cbk -
+ *
+ * @frame:
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ *
+ */
+int32_t
+ioc_writev_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct stat *stbuf)
+{
+ ioc_local_t *local = frame->local;
+ uint64_t ioc_inode = 0;
+
+ inode_ctx_get (local->fd->inode, this, &ioc_inode);
+
+ if (ioc_inode)
+ ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+ STACK_UNWIND (frame, op_ret, op_errno, stbuf);
+ return 0;
+}
+
+/*
+ * ioc_writev
+ *
+ * @frame:
+ * @this:
+ * @fd:
+ * @vector:
+ * @count:
+ * @offset:
+ *
+ */
+int32_t
+ioc_writev (call_frame_t *frame,
+ xlator_t *this,
+ fd_t *fd,
+ struct iovec *vector,
+ int32_t count,
+ off_t offset)
+{
+ ioc_local_t *local = NULL;
+ uint64_t ioc_inode = 0;
+
+ local = CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (local);
+
+ /* TODO: why is it not fd_ref'ed */
+ local->fd = fd;
+ frame->local = local;
+
+ inode_ctx_get (fd->inode, this, &ioc_inode);
+ if (ioc_inode)
+ ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+ STACK_WIND (frame,
+ ioc_writev_cbk,
+ FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->writev,
+ fd,
+ vector,
+ count,
+ offset);
+
+ return 0;
+}
+
+/*
+ * ioc_truncate_cbk -
+ *
+ * @frame:
+ * @cookie:
+ * @this:
+ * @op_ret:
+ * @op_errno:
+ * @buf:
+ *
+ */
+int32_t
+ioc_truncate_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;
+}
+
+/*
+ * ioc_truncate -
+ *
+ * @frame:
+ * @this:
+ * @loc:
+ * @offset:
+ *
+ */
+int32_t
+ioc_truncate (call_frame_t *frame,
+ xlator_t *this,
+ loc_t *loc,
+ off_t offset)
+{
+ uint64_t ioc_inode = 0;
+ inode_ctx_get (loc->inode, this, &ioc_inode);
+
+ if (ioc_inode)
+ ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+ STACK_WIND (frame,
+ ioc_truncate_cbk,
+ FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->truncate,
+ loc,
+ offset);
+ return 0;
+}
+
+/*
+ * ioc_ftruncate -
+ *
+ * @frame:
+ * @this:
+ * @fd:
+ * @offset:
+ *
+ */
+int32_t
+ioc_ftruncate (call_frame_t *frame,
+ xlator_t *this,
+ fd_t *fd,
+ off_t offset)
+{
+ uint64_t ioc_inode = 0;
+ inode_ctx_get (fd->inode, this, &ioc_inode);
+
+ if (ioc_inode)
+ ioc_inode_flush ((ioc_inode_t *)(long)ioc_inode);
+
+ STACK_WIND (frame,
+ ioc_truncate_cbk,
+ FIRST_CHILD(this),
+ FIRST_CHILD(this)->fops->ftruncate,
+ fd,
+ offset);
+ return 0;
+}
+
+int32_t
+ioc_lk_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct flock *lock)
+{
+ STACK_UNWIND (frame, op_ret, op_errno, lock);
+ return 0;
+}
+
+int32_t
+ioc_lk (call_frame_t *frame,
+ xlator_t *this,
+ fd_t *fd,
+ int32_t cmd,
+ struct flock *lock)
+{
+ ioc_inode_t *ioc_inode = NULL;
+ uint64_t tmp_inode = 0;
+
+ inode_ctx_get (fd->inode, this, &tmp_inode);
+ ioc_inode = (ioc_inode_t *)(long)tmp_inode;
+ if (!ioc_inode) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "inode context is NULL: returning EBADFD");
+ STACK_UNWIND (frame, -1, EBADFD, NULL);
+ return 0;
+ }
+
+ ioc_inode_lock (ioc_inode);
+ {
+ gettimeofday (&ioc_inode->tv, NULL);
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ STACK_WIND (frame, ioc_lk_cbk,
+ FIRST_CHILD (this),
+ FIRST_CHILD (this)->fops->lk, fd, cmd, lock);
+ return 0;
+}
+
+int32_t
+ioc_get_priority_list (const char *opt_str, struct list_head *first)
+{
+ int32_t max_pri = 0;
+ char *tmp_str = NULL;
+ char *tmp_str1 = NULL;
+ char *tmp_str2 = NULL;
+ char *dup_str = NULL;
+ char *stripe_str = NULL;
+ char *pattern = NULL;
+ char *priority = NULL;
+ char *string = strdup (opt_str);
+ struct ioc_priority *curr = NULL;
+
+ /* Get the pattern for cache priority.
+ * "option priority *.jpg:1,abc*:2" etc
+ */
+ /* TODO: inode_lru in table is statically hard-coded to 5,
+ * should be changed to run-time configuration
+ */
+ stripe_str = strtok_r (string, ",", &tmp_str);
+ while (stripe_str) {
+ curr = CALLOC (1, sizeof (struct ioc_priority));
+ ERR_ABORT (curr);
+ list_add_tail (&curr->list, first);
+
+ dup_str = strdup (stripe_str);
+ pattern = strtok_r (dup_str, ":", &tmp_str1);
+ if (!pattern)
+ return -1;
+ priority = strtok_r (NULL, ":", &tmp_str1);
+ if (!priority)
+ return -1;
+ gf_log ("io-cache",
+ GF_LOG_DEBUG,
+ "ioc priority : pattern %s : priority %s",
+ pattern,
+ priority);
+ curr->pattern = strdup (pattern);
+ curr->priority = strtol (priority, &tmp_str2, 0);
+ if (tmp_str2 && (*tmp_str2))
+ return -1;
+ else
+ max_pri = max (max_pri, curr->priority);
+ stripe_str = strtok_r (NULL, ",", &tmp_str);
+ }
+
+ return max_pri;
+}
+
+/*
+ * init -
+ * @this:
+ *
+ */
+int32_t
+init (xlator_t *this)
+{
+ ioc_table_t *table;
+ dict_t *options = this->options;
+ uint32_t index = 0;
+ char *page_size_string = NULL;
+ char *cache_size_string = NULL;
+
+ if (!this->children || this->children->next) {
+ gf_log (this->name, GF_LOG_ERROR,
+ "FATAL: io-cache not configured with exactly "
+ "one child");
+ return -1;
+ }
+
+ if (!this->parents) {
+ gf_log (this->name, GF_LOG_WARNING,
+ "dangling volume. check volfile ");
+ }
+
+ table = (void *) CALLOC (1, sizeof (*table));
+ ERR_ABORT (table);
+
+ table->xl = this;
+ table->page_size = IOC_PAGE_SIZE;
+ table->cache_size = IOC_CACHE_SIZE;
+
+ if (dict_get (options, "page-size"))
+ page_size_string = data_to_str (dict_get (options,
+ "page-size"));
+
+ if (page_size_string) {
+ if (gf_string2bytesize (page_size_string,
+ &table->page_size) != 0) {
+ gf_log ("io-cache", GF_LOG_ERROR,
+ "invalid number format \"%s\" of "
+ "\"option page-size\"",
+ page_size_string);
+ return -1;
+ }
+ gf_log (this->name, GF_LOG_DEBUG,
+ "using page-size %"PRIu64"", table->page_size);
+ }
+
+ if (dict_get (options, "cache-size"))
+ cache_size_string = data_to_str (dict_get (options,
+ "cache-size"));
+ if (cache_size_string) {
+ if (gf_string2bytesize (cache_size_string,
+ &table->cache_size) != 0) {
+ gf_log ("io-cache", GF_LOG_ERROR,
+ "invalid number format \"%s\" of "
+ "\"option cache-size\"",
+ cache_size_string);
+ return -1;
+ }
+
+ gf_log (this->name, GF_LOG_DEBUG,
+ "using cache-size %"PRIu64"", table->cache_size);
+ }
+
+ table->cache_timeout = 1;
+
+ if (dict_get (options, "cache-timeout")) {
+ table->cache_timeout =
+ data_to_uint32 (dict_get (options,
+ "cache-timeout"));
+ gf_log (this->name, GF_LOG_DEBUG,
+ "Using %d seconds to revalidate cache",
+ table->cache_timeout);
+ }
+
+ INIT_LIST_HEAD (&table->priority_list);
+ if (dict_get (options, "priority")) {
+ char *option_list = data_to_str (dict_get (options,
+ "priority"));
+ gf_log (this->name, GF_LOG_DEBUG,
+ "option path %s", option_list);
+ /* parse the list of pattern:priority */
+ table->max_pri = ioc_get_priority_list (option_list,
+ &table->priority_list);
+
+ if (table->max_pri == -1)
+ return -1;
+ }
+ table->max_pri ++;
+ INIT_LIST_HEAD (&table->inodes);
+
+ table->inode_lru = CALLOC (table->max_pri, sizeof (struct list_head));
+ ERR_ABORT (table->inode_lru);
+ for (index = 0; index < (table->max_pri); index++)
+ INIT_LIST_HEAD (&table->inode_lru[index]);
+
+ pthread_mutex_init (&table->table_lock, NULL);
+ this->private = table;
+ return 0;
+}
+
+/*
+ * fini -
+ *
+ * @this:
+ *
+ */
+void
+fini (xlator_t *this)
+{
+ ioc_table_t *table = this->private;
+
+ pthread_mutex_destroy (&table->table_lock);
+ FREE (table);
+
+ this->private = NULL;
+ return;
+}
+
+struct xlator_fops fops = {
+ .open = ioc_open,
+ .create = ioc_create,
+ .readv = ioc_readv,
+ .writev = ioc_writev,
+ .truncate = ioc_truncate,
+ .ftruncate = ioc_ftruncate,
+ .utimens = ioc_utimens,
+ .lookup = ioc_lookup,
+ .lk = ioc_lk
+};
+
+struct xlator_mops mops = {
+};
+
+struct xlator_cbks cbks = {
+ .forget = ioc_forget,
+ .release = ioc_release
+};
+
+struct volume_options options[] = {
+ { .key = {"priority"},
+ .type = GF_OPTION_TYPE_ANY
+ },
+ { .key = {"cache-timeout", "force-revalidate-timeout"},
+ .type = GF_OPTION_TYPE_INT,
+ .min = 0,
+ .max = 60
+ },
+ { .key = {"page-size"},
+ .type = GF_OPTION_TYPE_SIZET,
+ .min = 16 * GF_UNIT_KB,
+ .max = 4 * GF_UNIT_MB
+ },
+ { .key = {"cache-size"},
+ .type = GF_OPTION_TYPE_SIZET,
+ .min = 4 * GF_UNIT_MB,
+ .max = 6 * GF_UNIT_GB
+ },
+ { .key = {NULL} },
+};
diff --git a/xlators/performance/io-cache/src/io-cache.h b/xlators/performance/io-cache/src/io-cache.h
new file mode 100644
index 000000000..e997f6e7c
--- /dev/null
+++ b/xlators/performance/io-cache/src/io-cache.h
@@ -0,0 +1,330 @@
+/*
+ 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/>.
+*/
+
+#ifndef __IO_CACHE_H
+#define __IO_CACHE_H
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include "compat-errno.h"
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "common-utils.h"
+#include "call-stub.h"
+#include <sys/time.h>
+#include <fnmatch.h>
+
+#define IOC_PAGE_SIZE (1024 * 128) /* 128KB */
+#define IOC_CACHE_SIZE (32 * 1024 * 1024)
+
+struct ioc_table;
+struct ioc_local;
+struct ioc_page;
+struct ioc_inode;
+
+struct ioc_priority {
+ struct list_head list;
+ char *pattern;
+ uint32_t priority;
+};
+
+/*
+ * ioc_waitq - this structure is used to represents the waiting
+ * frames on a page
+ *
+ * @next: pointer to next object in waitq
+ * @data: pointer to the frame which is waiting
+ */
+struct ioc_waitq {
+ struct ioc_waitq *next;
+ void *data;
+ off_t pending_offset;
+ size_t pending_size;
+};
+
+/*
+ * ioc_fill -
+ *
+ */
+struct ioc_fill {
+ struct list_head list; /* list of ioc_fill structures of a frame */
+ off_t offset;
+ size_t size;
+ struct iovec *vector;
+ int32_t count;
+ dict_t *refs;
+};
+
+struct ioc_local {
+ mode_t mode;
+ int32_t flags;
+ loc_t file_loc;
+ off_t offset;
+ size_t size;
+ int32_t op_ret;
+ int32_t op_errno;
+ struct list_head fill_list; /* list of ioc_fill structures */
+ off_t pending_offset; /* offset from this frame should continue */
+ size_t pending_size; /* size of data this frame is waiting on */
+ struct ioc_inode *inode;
+ int32_t wait_count;
+ pthread_mutex_t local_lock;
+ struct ioc_waitq *waitq;
+ void *stub;
+ fd_t *fd;
+ int32_t need_xattr;
+ dict_t *xattr_req;
+};
+
+/*
+ * ioc_page - structure to store page of data from file
+ *
+ */
+struct ioc_page {
+ struct list_head pages;
+ struct list_head page_lru;
+ struct ioc_inode *inode; /* inode this page belongs to */
+ struct ioc_priority *priority;
+ char dirty;
+ char ready;
+ struct iovec *vector;
+ int32_t count;
+ off_t offset;
+ size_t size;
+ struct ioc_waitq *waitq;
+ dict_t *ref;
+ pthread_mutex_t page_lock;
+};
+
+struct ioc_inode {
+ struct ioc_table *table;
+ struct list_head pages; /* list of pages of this inode */
+ struct list_head inode_list; /* list of inodes, maintained by io-cache translator */
+ struct list_head inode_lru;
+ struct list_head page_lru;
+ struct ioc_waitq *waitq;
+ pthread_mutex_t inode_lock;
+ uint32_t weight; /* weight of the inode, increases on each read */
+ time_t mtime; /* mtime of the server file when last cached */
+ struct timeval tv; /* time-stamp at last re-validate */
+};
+
+struct ioc_table {
+ uint64_t page_size;
+ uint64_t cache_size;
+ uint64_t cache_used;
+ struct list_head inodes; /* list of inodes cached */
+ struct list_head active;
+ struct list_head *inode_lru;
+ struct list_head priority_list;
+ int32_t readv_count;
+ pthread_mutex_t table_lock;
+ xlator_t *xl;
+ uint32_t inode_count;
+ int32_t cache_timeout;
+ int32_t max_pri;
+};
+
+typedef struct ioc_table ioc_table_t;
+typedef struct ioc_local ioc_local_t;
+typedef struct ioc_page ioc_page_t;
+typedef struct ioc_inode ioc_inode_t;
+typedef struct ioc_waitq ioc_waitq_t;
+typedef struct ioc_fill ioc_fill_t;
+
+void *
+str_to_ptr (char *string);
+
+char *
+ptr_to_str (void *ptr);
+
+int32_t
+ioc_readv_disabled_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct iovec *vector,
+ int32_t count,
+ struct stat *stbuf);
+
+ioc_page_t *
+ioc_page_get (ioc_inode_t *ioc_inode,
+ off_t offset);
+
+ioc_page_t *
+ioc_page_create (ioc_inode_t *ioc_inode,
+ off_t offset);
+
+void
+ioc_page_fault (ioc_inode_t *ioc_inode,
+ call_frame_t *frame,
+ fd_t *fd,
+ off_t offset);
+void
+ioc_wait_on_page (ioc_page_t *page,
+ call_frame_t *frame,
+ off_t offset,
+ size_t size);
+
+ioc_waitq_t *
+ioc_page_wakeup (ioc_page_t *page);
+
+void
+ioc_page_flush (ioc_page_t *page);
+
+ioc_waitq_t *
+ioc_page_error (ioc_page_t *page,
+ int32_t op_ret,
+ int32_t op_errno);
+void
+ioc_page_purge (ioc_page_t *page);
+
+void
+ioc_frame_return (call_frame_t *frame);
+
+void
+ioc_waitq_return (ioc_waitq_t *waitq);
+
+void
+ioc_frame_fill (ioc_page_t *page,
+ call_frame_t *frame,
+ off_t offset,
+ size_t size);
+
+#define ioc_inode_lock(ioc_inode) \
+ do { \
+ gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG, \
+ "locked inode(%p)", ioc_inode); \
+ pthread_mutex_lock (&ioc_inode->inode_lock); \
+ } while (0)
+
+
+#define ioc_inode_unlock(ioc_inode) \
+ do { \
+ gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG, \
+ "unlocked inode(%p)", ioc_inode); \
+ pthread_mutex_unlock (&ioc_inode->inode_lock); \
+ } while (0)
+
+
+#define ioc_table_lock(table) \
+ do { \
+ gf_log (table->xl->name, GF_LOG_DEBUG, \
+ "locked table(%p)", table); \
+ pthread_mutex_lock (&table->table_lock); \
+ } while (0)
+
+
+#define ioc_table_unlock(table) \
+ do { \
+ gf_log (table->xl->name, GF_LOG_DEBUG, \
+ "unlocked table(%p)", table); \
+ pthread_mutex_unlock (&table->table_lock); \
+ } while (0)
+
+
+#define ioc_local_lock(local) \
+ do { \
+ gf_log (local->inode->table->xl->name, GF_LOG_DEBUG, \
+ "locked local(%p)", local); \
+ pthread_mutex_lock (&local->local_lock); \
+ } while (0)
+
+
+#define ioc_local_unlock(local) \
+ do { \
+ gf_log (local->inode->table->xl->name, GF_LOG_DEBUG, \
+ "unlocked local(%p)", local); \
+ pthread_mutex_unlock (&local->local_lock); \
+ } while (0)
+
+
+#define ioc_page_lock(page) \
+ do { \
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG, \
+ "locked page(%p)", page); \
+ pthread_mutex_lock (&page->page_lock); \
+ } while (0)
+
+
+#define ioc_page_unlock(page) \
+ do { \
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG, \
+ "unlocked page(%p)", page); \
+ pthread_mutex_unlock (&page->page_lock); \
+ } while (0)
+
+
+static inline uint64_t
+time_elapsed (struct timeval *now,
+ struct timeval *then)
+{
+ uint64_t sec = now->tv_sec - then->tv_sec;
+
+ if (sec)
+ return sec;
+
+ return 0;
+}
+
+ioc_inode_t *
+ioc_inode_search (ioc_table_t *table,
+ inode_t *inode);
+
+void
+ioc_inode_destroy (ioc_inode_t *ioc_inode);
+
+ioc_inode_t *
+ioc_inode_update (ioc_table_t *table,
+ inode_t *inode,
+ uint32_t weight);
+
+int64_t
+ioc_page_destroy (ioc_page_t *page);
+
+int32_t
+__ioc_inode_flush (ioc_inode_t *ioc_inode);
+
+void
+ioc_inode_flush (ioc_inode_t *ioc_inode);
+
+void
+ioc_inode_wakeup (call_frame_t *frame,
+ ioc_inode_t *ioc_inode,
+ struct stat *stbuf);
+
+int8_t
+ioc_cache_still_valid (ioc_inode_t *ioc_inode,
+ struct stat *stbuf);
+
+int32_t
+ioc_prune (ioc_table_t *table);
+
+int32_t
+ioc_need_prune (ioc_table_t *table);
+
+#endif /* __READ_AHEAD_H */
diff --git a/xlators/performance/io-cache/src/ioc-inode.c b/xlators/performance/io-cache/src/ioc-inode.c
new file mode 100644
index 000000000..2e2e561dd
--- /dev/null
+++ b/xlators/performance/io-cache/src/ioc-inode.c
@@ -0,0 +1,201 @@
+/*
+ Copyright (c) 2007, 2008, 2009 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 "io-cache.h"
+
+
+/*
+ * str_to_ptr - convert a string to pointer
+ * @string: string
+ *
+ */
+void *
+str_to_ptr (char *string)
+{
+ void *ptr = (void *)strtoul (string, NULL, 16);
+ return ptr;
+}
+
+
+/*
+ * ptr_to_str - convert a pointer to string
+ * @ptr: pointer
+ *
+ */
+char *
+ptr_to_str (void *ptr)
+{
+ char *str;
+ asprintf (&str, "%p", ptr);
+ return str;
+}
+
+void
+ioc_inode_wakeup (call_frame_t *frame,
+ ioc_inode_t *ioc_inode,
+ struct stat *stbuf)
+{
+ ioc_waitq_t *waiter = NULL, *waited = NULL;
+ ioc_waitq_t *page_waitq = NULL;
+ int8_t cache_still_valid = 1;
+ ioc_local_t *local = frame->local;
+ int8_t need_fault = 0;
+ ioc_page_t *waiter_page = NULL;
+
+ ioc_inode_lock (ioc_inode);
+ {
+ waiter = ioc_inode->waitq;
+ ioc_inode->waitq = NULL;
+ }
+ ioc_inode_unlock (ioc_inode);
+
+ if (stbuf)
+ cache_still_valid = ioc_cache_still_valid (ioc_inode, stbuf);
+ else
+ cache_still_valid = 0;
+
+ if (!waiter) {
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "cache validate called without any "
+ "page waiting to be validated");
+ }
+
+ while (waiter) {
+ waiter_page = waiter->data;
+ page_waitq = NULL;
+
+ if (waiter_page) {
+ if (cache_still_valid) {
+ /* cache valid, wake up page */
+ ioc_inode_lock (ioc_inode);
+ {
+ page_waitq =
+ ioc_page_wakeup (waiter_page);
+ }
+ ioc_inode_unlock (ioc_inode);
+ if (page_waitq)
+ ioc_waitq_return (page_waitq);
+ } else {
+ /* cache invalid, generate page fault and set
+ * page->ready = 0, to avoid double faults
+ */
+ ioc_inode_lock (ioc_inode);
+
+ if (waiter_page->ready) {
+ waiter_page->ready = 0;
+ need_fault = 1;
+ } else {
+ gf_log (frame->this->name,
+ GF_LOG_DEBUG,
+ "validate frame(%p) is waiting"
+ "for in-transit page = %p",
+ frame, waiter_page);
+ }
+
+ ioc_inode_unlock (ioc_inode);
+
+ if (need_fault) {
+ need_fault = 0;
+ ioc_page_fault (ioc_inode, frame,
+ local->fd,
+ waiter_page->offset);
+ }
+ }
+ }
+
+ waited = waiter;
+ waiter = waiter->next;
+
+ waited->data = NULL;
+ free (waited);
+ }
+}
+
+/*
+ * ioc_inode_update - create a new ioc_inode_t structure and add it to
+ * the table table. fill in the fields which are derived
+ * from inode_t corresponding to the file
+ *
+ * @table: io-table structure
+ * @inode: inode structure
+ *
+ * not for external reference
+ */
+ioc_inode_t *
+ioc_inode_update (ioc_table_t *table,
+ inode_t *inode,
+ uint32_t weight)
+{
+ ioc_inode_t *ioc_inode = CALLOC (1, sizeof (ioc_inode_t));
+ ERR_ABORT (ioc_inode);
+
+ ioc_inode->table = table;
+
+ /* initialize the list for pages */
+ INIT_LIST_HEAD (&ioc_inode->pages);
+ INIT_LIST_HEAD (&ioc_inode->page_lru);
+
+ ioc_table_lock (table);
+
+ table->inode_count++;
+ list_add (&ioc_inode->inode_list, &table->inodes);
+ list_add_tail (&ioc_inode->inode_lru, &table->inode_lru[weight]);
+
+ gf_log (table->xl->name,
+ GF_LOG_DEBUG,
+ "adding to inode_lru[%d]", weight);
+
+ ioc_table_unlock (table);
+
+ pthread_mutex_init (&ioc_inode->inode_lock, NULL);
+ ioc_inode->weight = weight;
+
+ return ioc_inode;
+}
+
+
+/*
+ * ioc_inode_destroy - destroy an ioc_inode_t object.
+ *
+ * @inode: inode to destroy
+ *
+ * to be called only from ioc_forget.
+ */
+void
+ioc_inode_destroy (ioc_inode_t *ioc_inode)
+{
+ ioc_table_t *table = ioc_inode->table;
+
+ ioc_table_lock (table);
+ table->inode_count--;
+ list_del (&ioc_inode->inode_list);
+ list_del (&ioc_inode->inode_lru);
+ ioc_table_unlock (table);
+
+ ioc_inode_flush (ioc_inode);
+
+ pthread_mutex_destroy (&ioc_inode->inode_lock);
+ free (ioc_inode);
+}
+
diff --git a/xlators/performance/io-cache/src/page.c b/xlators/performance/io-cache/src/page.c
new file mode 100644
index 000000000..e549f0bb5
--- /dev/null
+++ b/xlators/performance/io-cache/src/page.c
@@ -0,0 +1,778 @@
+/*
+ Copyright (c) 2007, 2008, 2009 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 "io-cache.h"
+#include <assert.h>
+#include <sys/time.h>
+
+ioc_page_t *
+ioc_page_get (ioc_inode_t *ioc_inode,
+ off_t offset)
+{
+ int8_t found = 0;
+ ioc_page_t *page = NULL;
+ ioc_table_t *table = ioc_inode->table;
+ off_t rounded_offset = floor (offset, table->page_size);
+
+ if (list_empty (&ioc_inode->pages)) {
+ return NULL;
+ }
+
+ list_for_each_entry (page, &ioc_inode->pages, pages) {
+ if (page->offset == rounded_offset) {
+ found = 1;
+ break;
+ }
+ }
+
+ /* was previously returning ioc_inode itself..,
+ * 1st of its type and found one more downstairs :O */
+ if (!found){
+ page = NULL;
+ } else {
+ /* push the page to the end of the lru list */
+ list_move_tail (&page->page_lru, &ioc_inode->page_lru);
+ }
+
+ return page;
+}
+
+
+/*
+ * ioc_page_destroy -
+ *
+ * @page:
+ *
+ */
+int64_t
+ioc_page_destroy (ioc_page_t *page)
+{
+ int64_t page_size = 0;
+
+ page_size = page->size;
+
+ if (page->waitq) {
+ /* frames waiting on this page, do not destroy this page */
+ page_size = -1;
+ } else {
+
+ list_del (&page->pages);
+ list_del (&page->page_lru);
+
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG,
+ "destroying page = %p, offset = %"PRId64" "
+ "&& inode = %p",
+ page, page->offset, page->inode);
+
+ if (page->vector){
+ dict_unref (page->ref);
+ free (page->vector);
+ page->vector = NULL;
+ }
+
+ page->inode = NULL;
+
+ }
+
+ if (page_size != -1) {
+ pthread_mutex_destroy (&page->page_lock);
+ free (page);
+ }
+
+ return page_size;
+}
+
+/*
+ * ioc_prune - prune the cache. we have a limit to the number of pages we
+ * can have in-memory.
+ *
+ * @table: ioc_table_t of this translator
+ *
+ */
+int32_t
+ioc_prune (ioc_table_t *table)
+{
+ ioc_inode_t *curr = NULL, *next_ioc_inode = NULL;
+ ioc_page_t *page = NULL, *next = NULL;
+ int32_t ret = -1;
+ int32_t index = 0;
+ uint64_t size_to_prune = 0;
+ uint64_t size_pruned = 0;
+
+ ioc_table_lock (table);
+ {
+ size_to_prune = table->cache_used - table->cache_size;
+ /* take out the least recently used inode */
+ for (index=0; index < table->max_pri; index++) {
+ list_for_each_entry_safe (curr, next_ioc_inode,
+ &table->inode_lru[index],
+ inode_lru) {
+ /* prune page-by-page for this inode, till
+ * we reach the equilibrium */
+ ioc_inode_lock (curr);
+ /* { */
+
+ list_for_each_entry_safe (page, next,
+ &curr->page_lru,
+ page_lru) {
+ /* done with all pages, and not
+ * reached equilibrium yet??
+ * continue with next inode in
+ * lru_list */
+ size_pruned += page->size;
+ ret = ioc_page_destroy (page);
+
+ if (ret != -1)
+ table->cache_used -= ret;
+
+ gf_log (table->xl->name,
+ GF_LOG_DEBUG,
+ "index = %d && table->cache_"
+ "used = %"PRIu64" && table->"
+ "cache_size = %"PRIu64,
+ index, table->cache_used,
+ table->cache_size);
+
+ if (size_pruned >= size_to_prune)
+ break;
+ } /* list_for_each_entry_safe(page...) */
+ if (list_empty (&curr->pages)) {
+ list_del_init (&curr->inode_lru);
+ }
+
+ /* } */
+ ioc_inode_unlock (curr);
+
+ if (size_pruned >= size_to_prune)
+ break;
+ } /* list_for_each_entry_safe (curr...) */
+
+ if (size_pruned >= size_to_prune)
+ break;
+ } /* for(index=0;...) */
+
+ } /* ioc_inode_table locked region end */
+ ioc_table_unlock (table);
+
+ return 0;
+}
+
+/*
+ * ioc_page_create - create a new page.
+ *
+ * @ioc_inode:
+ * @offset:
+ *
+ */
+ioc_page_t *
+ioc_page_create (ioc_inode_t *ioc_inode,
+ off_t offset)
+{
+ ioc_table_t *table = ioc_inode->table;
+ ioc_page_t *page = NULL;
+ off_t rounded_offset = floor (offset, table->page_size);
+ ioc_page_t *newpage = CALLOC (1, sizeof (*newpage));
+ ERR_ABORT (newpage);
+
+ if (ioc_inode)
+ table = ioc_inode->table;
+ else {
+ return NULL;
+ }
+
+ newpage->offset = rounded_offset;
+ newpage->inode = ioc_inode;
+ pthread_mutex_init (&newpage->page_lock, NULL);
+
+ list_add_tail (&newpage->page_lru, &ioc_inode->page_lru);
+ list_add_tail (&newpage->pages, &ioc_inode->pages);
+
+ page = newpage;
+
+ gf_log ("io-cache", GF_LOG_DEBUG,
+ "returning new page %p", page);
+ return page;
+}
+
+/*
+ * ioc_wait_on_page - pause a frame to wait till the arrival of a page.
+ * here we need to handle the case when the frame who calls wait_on_page
+ * himself has caused page_fault
+ *
+ * @page: page to wait on
+ * @frame: call frame who is waiting on page
+ *
+ */
+void
+ioc_wait_on_page (ioc_page_t *page,
+ call_frame_t *frame,
+ off_t offset,
+ size_t size)
+{
+ ioc_waitq_t *waitq = NULL;
+ ioc_local_t *local = frame->local;
+
+ waitq = CALLOC (1, sizeof (*waitq));
+ ERR_ABORT (waitq);
+
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "frame(%p) waiting on page = %p, offset=%"PRId64", "
+ "size=%"GF_PRI_SIZET"",
+ frame, page, offset, size);
+
+ waitq->data = frame;
+ waitq->next = page->waitq;
+ waitq->pending_offset = offset;
+ waitq->pending_size = size;
+ page->waitq = waitq;
+ /* one frame can wait only once on a given page,
+ * local->wait_count is number of pages a frame is waiting on */
+ ioc_local_lock (local);
+ {
+ local->wait_count++;
+ }
+ ioc_local_unlock (local);
+}
+
+
+/*
+ * ioc_cache_still_valid - see if cached pages ioc_inode are still valid
+ * against given stbuf
+ *
+ * @ioc_inode:
+ * @stbuf:
+ *
+ * assumes ioc_inode is locked
+ */
+int8_t
+ioc_cache_still_valid (ioc_inode_t *ioc_inode,
+ struct stat *stbuf)
+{
+ int8_t cache_still_valid = 1;
+
+#if 0
+ if (!stbuf || (stbuf->st_mtime != ioc_inode->mtime) ||
+ (stbuf->st_mtim.tv_nsec != ioc_inode->stbuf.st_mtim.tv_nsec))
+ cache_still_valid = 0;
+
+#else
+ if (!stbuf || (stbuf->st_mtime != ioc_inode->mtime))
+ cache_still_valid = 0;
+
+#endif
+
+#if 0
+ /* talk with avati@zresearch.com to enable this section */
+ if (!ioc_inode->mtime && stbuf) {
+ cache_still_valid = 1;
+ ioc_inode->mtime = stbuf->st_mtime;
+ }
+#endif
+
+ return cache_still_valid;
+}
+
+
+void
+ioc_waitq_return (ioc_waitq_t *waitq)
+{
+ ioc_waitq_t *trav = NULL;
+ ioc_waitq_t *next = NULL;
+ call_frame_t *frame = NULL;
+
+ for (trav = waitq; trav; trav = next) {
+ next = trav->next;
+
+ frame = trav->data;
+ ioc_frame_return (frame);
+ free (trav);
+ }
+}
+
+
+int
+ioc_fault_cbk (call_frame_t *frame,
+ void *cookie,
+ xlator_t *this,
+ int32_t op_ret,
+ int32_t op_errno,
+ struct iovec *vector,
+ int32_t count,
+ struct stat *stbuf)
+{
+ ioc_local_t *local = frame->local;
+ off_t offset = local->pending_offset;
+ ioc_inode_t *ioc_inode = local->inode;
+ ioc_table_t *table = ioc_inode->table;
+ ioc_page_t *page = NULL;
+ off_t trav_offset = 0;
+ size_t payload_size = 0;
+ int32_t destroy_size = 0;
+ size_t page_size = 0;
+ ioc_waitq_t *waitq = NULL;
+
+ trav_offset = offset;
+ payload_size = op_ret;
+
+ ioc_inode_lock (ioc_inode);
+ {
+ if (op_ret == -1 ||
+ (op_ret >= 0 &&
+ !ioc_cache_still_valid(ioc_inode, stbuf))) {
+ gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG,
+ "cache for inode(%p) is invalid. flushing "
+ "all pages", ioc_inode);
+ destroy_size = __ioc_inode_flush (ioc_inode);
+ }
+
+ if (op_ret >= 0)
+ ioc_inode->mtime = stbuf->st_mtime;
+
+ gettimeofday (&ioc_inode->tv, NULL);
+
+ if (op_ret < 0) {
+ /* error, readv returned -1 */
+ page = ioc_page_get (ioc_inode, offset);
+ if (page)
+ waitq = ioc_page_error (page, op_ret,
+ op_errno);
+ } else {
+ gf_log (ioc_inode->table->xl->name, GF_LOG_DEBUG,
+ "op_ret = %d", op_ret);
+ page = ioc_page_get (ioc_inode, offset);
+ if (!page) {
+ /* page was flushed */
+ /* some serious bug ? */
+ gf_log (this->name, GF_LOG_DEBUG,
+ "wasted copy: %"PRId64"[+%"PRId64"] "
+ "ioc_inode=%p", offset,
+ table->page_size, ioc_inode);
+ } else {
+ if (page->vector) {
+ dict_unref (page->ref);
+ free (page->vector);
+ page->vector = NULL;
+ }
+
+ /* keep a copy of the page for our cache */
+ page->vector = iov_dup (vector, count);
+ page->count = count;
+ if (frame->root->rsp_refs) {
+ dict_ref (frame->root->rsp_refs);
+ page->ref = frame->root->rsp_refs;
+ } else {
+ /* TODO: we have got a response to
+ * our request and no data */
+ gf_log (this->name, GF_LOG_CRITICAL,
+ "frame>root>rsp_refs is null");
+ } /* if(frame->root->rsp_refs) */
+
+ /* page->size should indicate exactly how
+ * much the readv call to the child
+ * translator returned. earlier op_ret
+ * from child translator was used, which
+ * gave rise to a bug where reads from
+ * io-cached volume were resulting in 0
+ * byte replies */
+ page_size = iov_length(vector, count);
+
+ page->size = page_size;
+
+ if (page->waitq) {
+ /* wake up all the frames waiting on
+ * this page, including
+ * the frame which triggered fault */
+ waitq = ioc_page_wakeup (page);
+ } /* if(page->waitq) */
+ } /* if(!page)...else */
+ } /* if(op_ret < 0)...else */
+ } /* ioc_inode locked region end */
+ ioc_inode_unlock (ioc_inode);
+
+ ioc_waitq_return (waitq);
+
+ if (page_size) {
+ ioc_table_lock (table);
+ {
+ table->cache_used += page_size;
+ }
+ ioc_table_unlock (table);
+ }
+
+ if (destroy_size) {
+ ioc_table_lock (table);
+ {
+ table->cache_used -= destroy_size;
+ }
+ ioc_table_unlock (table);
+ }
+
+ if (ioc_need_prune (ioc_inode->table)) {
+ ioc_prune (ioc_inode->table);
+ }
+
+ gf_log (this->name, GF_LOG_DEBUG, "fault frame %p returned", frame);
+ pthread_mutex_destroy (&local->local_lock);
+
+ fd_unref (local->fd);
+
+ STACK_DESTROY (frame->root);
+ return 0;
+}
+
+/*
+ * ioc_page_fault -
+ *
+ * @ioc_inode:
+ * @frame:
+ * @fd:
+ * @offset:
+ *
+ */
+void
+ioc_page_fault (ioc_inode_t *ioc_inode,
+ call_frame_t *frame,
+ fd_t *fd,
+ off_t offset)
+{
+ ioc_table_t *table = ioc_inode->table;
+ call_frame_t *fault_frame = copy_frame (frame);
+ ioc_local_t *fault_local = CALLOC (1, sizeof (ioc_local_t));
+ ERR_ABORT (fault_local);
+
+ /* NOTE: copy_frame() means, the frame the fop whose fd_ref we
+ * are using till now won't be valid till we get reply from server.
+ * we unref this fd, in fault_cbk */
+ fault_local->fd = fd_ref (fd);
+
+ fault_frame->local = fault_local;
+ pthread_mutex_init (&fault_local->local_lock, NULL);
+
+ INIT_LIST_HEAD (&fault_local->fill_list);
+ fault_local->pending_offset = offset;
+ fault_local->pending_size = table->page_size;
+ fault_local->inode = ioc_inode;
+
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "stack winding page fault for offset = %"PRId64" with "
+ "frame %p", offset, fault_frame);
+
+ STACK_WIND (fault_frame, ioc_fault_cbk,
+ FIRST_CHILD(fault_frame->this),
+ FIRST_CHILD(fault_frame->this)->fops->readv,
+ fd, table->page_size, offset);
+ return;
+}
+
+void
+ioc_frame_fill (ioc_page_t *page,
+ call_frame_t *frame,
+ off_t offset,
+ size_t size)
+{
+ ioc_local_t *local = frame->local;
+ ioc_fill_t *fill = NULL;
+ off_t src_offset = 0;
+ off_t dst_offset = 0;
+ ssize_t copy_size = 0;
+ ioc_inode_t *ioc_inode = page->inode;
+
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "frame (%p) offset = %"PRId64" && size = %"GF_PRI_SIZET" "
+ "&& page->size = %"GF_PRI_SIZET" && wait_count = %d",
+ frame, offset, size, page->size, local->wait_count);
+
+ /* immediately move this page to the end of the page_lru list */
+ list_move_tail (&page->page_lru, &ioc_inode->page_lru);
+ /* fill local->pending_size bytes from local->pending_offset */
+ if (local->op_ret != -1 && page->size) {
+ if (offset > page->offset)
+ /* offset is offset in file, convert it to offset in
+ * page */
+ src_offset = offset - page->offset;
+ /*FIXME: since offset is the offset within page is the
+ * else case valid? */
+ else
+ /* local->pending_offset is in previous page. do not
+ * fill until we have filled all previous pages */
+ dst_offset = page->offset - offset;
+
+ /* we have to copy from offset to either end of this page
+ * or till the requested size */
+ copy_size = min (page->size - src_offset,
+ size - dst_offset);
+
+ if (copy_size < 0) {
+ /* if page contains fewer bytes and the required offset
+ is beyond the page size in the page */
+ copy_size = src_offset = 0;
+ }
+
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG,
+ "copy_size = %"GF_PRI_SIZET" && src_offset = "
+ "%"PRId64" && dst_offset = %"PRId64"",
+ copy_size, src_offset, dst_offset);
+
+ {
+ ioc_fill_t *new = CALLOC (1, sizeof (*new));
+ ERR_ABORT (new);
+ new->offset = page->offset;
+ new->size = copy_size;
+ new->refs = dict_ref (page->ref);
+ new->count = iov_subset (page->vector,
+ page->count,
+ src_offset,
+ src_offset + copy_size,
+ NULL);
+ new->vector = CALLOC (new->count,
+ sizeof (struct iovec));
+ ERR_ABORT (new->vector);
+ new->count = iov_subset (page->vector,
+ page->count,
+ src_offset,
+ src_offset + copy_size,
+ new->vector);
+
+
+
+ /* add the ioc_fill to fill_list for this frame */
+ if (list_empty (&local->fill_list)) {
+ /* if list is empty, then this is the first
+ * time we are filling frame, add the
+ * ioc_fill_t to the end of list */
+ list_add_tail (&new->list, &local->fill_list);
+ } else {
+ int8_t found = 0;
+ /* list is not empty, we need to look for
+ * where this offset fits in list */
+ list_for_each_entry (fill, &local->fill_list,
+ list) {
+ if (fill->offset > new->offset) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (found) {
+ found = 0;
+ list_add_tail (&new->list,
+ &fill->list);
+ } else {
+ list_add_tail (&new->list,
+ &local->fill_list);
+ }
+ }
+ }
+ local->op_ret += copy_size;
+ }
+}
+
+/*
+ * ioc_frame_unwind - frame unwinds only from here
+ *
+ * @frame: call frame to unwind
+ *
+ * to be used only by ioc_frame_return(), when a frame has
+ * finished waiting on all pages, required
+ *
+ */
+static void
+ioc_frame_unwind (call_frame_t *frame)
+{
+ ioc_local_t *local = frame->local;
+ ioc_fill_t *fill = NULL, *next = NULL;
+ int32_t count = 0;
+ struct iovec *vector = NULL;
+ int32_t copied = 0;
+ dict_t *refs = NULL;
+ struct stat stbuf = {0,};
+ int32_t op_ret = 0;
+
+ // ioc_local_lock (local);
+ refs = get_new_dict ();
+
+ frame->local = NULL;
+
+ if (list_empty (&local->fill_list)) {
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "frame(%p) has 0 entries in local->fill_list "
+ "(offset = %"PRId64" && size = %"GF_PRI_SIZET")",
+ frame, local->offset, local->size);
+ }
+
+ list_for_each_entry (fill, &local->fill_list, list) {
+ count += fill->count;
+ }
+
+ vector = CALLOC (count, sizeof (*vector));
+ ERR_ABORT (vector);
+
+ list_for_each_entry_safe (fill, next, &local->fill_list, list) {
+ memcpy (((char *)vector) + copied,
+ fill->vector,
+ fill->count * sizeof (*vector));
+
+ copied += (fill->count * sizeof (*vector));
+
+ dict_copy (fill->refs, refs);
+
+ list_del (&fill->list);
+ dict_unref (fill->refs);
+ free (fill->vector);
+ free (fill);
+ }
+
+ frame->root->rsp_refs = dict_ref (refs);
+
+ op_ret = iov_length (vector, count);
+ gf_log (frame->this->name, GF_LOG_DEBUG,
+ "frame(%p) unwinding with op_ret=%d", frame, op_ret);
+
+ // ioc_local_unlock (local);
+
+ STACK_UNWIND (frame,
+ op_ret,
+ local->op_errno,
+ vector,
+ count,
+ &stbuf);
+
+ dict_unref (refs);
+
+ pthread_mutex_destroy (&local->local_lock);
+ free (local);
+ free (vector);
+
+ return;
+}
+
+/*
+ * ioc_frame_return -
+ * @frame:
+ *
+ * to be called only when a frame is waiting on an in-transit page
+ */
+void
+ioc_frame_return (call_frame_t *frame)
+{
+ ioc_local_t *local = frame->local;
+ int32_t wait_count;
+ assert (local->wait_count > 0);
+
+ ioc_local_lock (local);
+ {
+ wait_count = --local->wait_count;
+ }
+ ioc_local_unlock (local);
+
+ if (!wait_count) {
+ ioc_frame_unwind (frame);
+ }
+
+ return;
+}
+
+/*
+ * ioc_page_wakeup -
+ * @page:
+ *
+ * to be called only when a frame is waiting on an in-transit page
+ */
+ioc_waitq_t *
+ioc_page_wakeup (ioc_page_t *page)
+{
+ ioc_waitq_t *waitq = NULL, *trav = NULL;
+ call_frame_t *frame = NULL;
+
+ waitq = page->waitq;
+ page->waitq = NULL;
+
+ trav = waitq;
+ page->ready = 1;
+
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG,
+ "page is %p && waitq = %p", page, waitq);
+
+ for (trav = waitq; trav; trav = trav->next) {
+ frame = trav->data;
+ ioc_frame_fill (page, frame, trav->pending_offset,
+ trav->pending_size);
+ }
+
+ return waitq;
+}
+
+
+/*
+ * ioc_page_error -
+ * @page:
+ * @op_ret:
+ * @op_errno:
+ *
+ */
+ioc_waitq_t *
+ioc_page_error (ioc_page_t *page,
+ int32_t op_ret,
+ int32_t op_errno)
+{
+ ioc_waitq_t *waitq = NULL, *trav = NULL;
+ call_frame_t *frame = NULL;
+ int64_t ret = 0;
+ ioc_table_t *table = NULL;
+ ioc_local_t *local = NULL;
+
+ waitq = page->waitq;
+ page->waitq = NULL;
+
+ gf_log (page->inode->table->xl->name, GF_LOG_DEBUG,
+ "page error for page = %p & waitq = %p", page, waitq);
+
+ for (trav = waitq; trav; trav = trav->next) {
+
+ frame = trav->data;
+
+ local = frame->local;
+ ioc_local_lock (local);
+ {
+ if (local->op_ret != -1) {
+ local->op_ret = op_ret;
+ local->op_errno = op_errno;
+ }
+ }
+ ioc_local_unlock (local);
+ }
+
+ table = page->inode->table;
+ ret = ioc_page_destroy (page);
+
+ if (ret != -1) {
+ table->cache_used -= ret;
+ }
+
+ return waitq;
+}