summaryrefslogtreecommitdiffstats
path: root/xlators/performance/read-ahead/src/page.c
diff options
context:
space:
mode:
Diffstat (limited to 'xlators/performance/read-ahead/src/page.c')
-rw-r--r--xlators/performance/read-ahead/src/page.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/xlators/performance/read-ahead/src/page.c b/xlators/performance/read-ahead/src/page.c
new file mode 100644
index 00000000000..3b8d4d2093e
--- /dev/null
+++ b/xlators/performance/read-ahead/src/page.c
@@ -0,0 +1,487 @@
+/*
+ Copyright (c) 2006, 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 "read-ahead.h"
+#include <assert.h>
+
+
+ra_page_t *
+ra_page_get (ra_file_t *file,
+ off_t offset)
+{
+ ra_page_t *page = NULL;
+ off_t rounded_offset = 0;
+
+ page = file->pages.next;
+ rounded_offset = floor (offset, file->page_size);
+
+ while (page != &file->pages && page->offset < rounded_offset)
+ page = page->next;
+
+ if (page == &file->pages || page->offset != rounded_offset)
+ page = NULL;
+
+ return page;
+}
+
+
+ra_page_t *
+ra_page_create (ra_file_t *file, off_t offset)
+{
+ ra_page_t *page = NULL;
+ off_t rounded_offset = 0;
+ ra_page_t *newpage = NULL;
+
+ page = file->pages.next;
+ rounded_offset = floor (offset, file->page_size);
+
+ while (page != &file->pages && page->offset < rounded_offset)
+ page = page->next;
+
+ if (page == &file->pages || page->offset != rounded_offset) {
+ newpage = CALLOC (1, sizeof (*newpage));
+ if (!newpage)
+ return NULL;
+
+ newpage->offset = rounded_offset;
+ newpage->prev = page->prev;
+ newpage->next = page;
+ newpage->file = file;
+ page->prev->next = newpage;
+ page->prev = newpage;
+
+ page = newpage;
+ }
+
+ return page;
+}
+
+
+void
+ra_wait_on_page (ra_page_t *page, call_frame_t *frame)
+{
+ ra_waitq_t *waitq = NULL;
+ ra_local_t *local = NULL;
+
+
+ local = frame->local;
+ waitq = CALLOC (1, sizeof (*waitq));
+ if (!waitq) {
+ gf_log (frame->this->name, GF_LOG_ERROR,
+ "out of memory :(");
+ return;
+ }
+
+ waitq->data = frame;
+ waitq->next = page->waitq;
+ page->waitq = waitq;
+
+ ra_local_lock (local);
+ {
+ local->wait_count++;
+ }
+ ra_local_unlock (local);
+}
+
+
+void
+ra_waitq_return (ra_waitq_t *waitq)
+{
+ ra_waitq_t *trav = NULL;
+ ra_waitq_t *next = NULL;
+ call_frame_t *frame = NULL;
+
+ for (trav = waitq; trav; trav = next) {
+ next = trav->next;
+
+ frame = trav->data;
+ ra_frame_return (frame);
+ free (trav);
+ }
+}
+
+
+int
+ra_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)
+{
+ ra_local_t *local = NULL;
+ off_t pending_offset = 0;
+ ra_file_t *file = NULL;
+ ra_page_t *page = NULL;
+ off_t trav_offset = 0;
+ size_t payload_size = 0;
+ ra_waitq_t *waitq = NULL;
+ fd_t *fd = NULL;
+ int ret = 0;
+ uint64_t tmp_file = 0;
+
+ local = frame->local;
+ fd = local->fd;
+
+ ret = fd_ctx_get (fd, this, &tmp_file);
+
+ file = (ra_file_t *)(long)tmp_file;
+ pending_offset = local->pending_offset;
+ trav_offset = pending_offset;
+ payload_size = op_ret;
+
+ ra_file_lock (file);
+ {
+ if (op_ret >= 0)
+ file->stbuf = *stbuf;
+
+ if (op_ret < 0) {
+ page = ra_page_get (file, pending_offset);
+ if (page)
+ waitq = ra_page_error (page, op_ret, op_errno);
+ goto unlock;
+ }
+
+ page = ra_page_get (file, pending_offset);
+ if (!page) {
+ gf_log (this->name, GF_LOG_DEBUG,
+ "wasted copy: %"PRId64"[+%"PRId64"] file=%p",
+ pending_offset, file->page_size, file);
+ goto unlock;
+ }
+
+ if (page->vector) {
+ dict_unref (page->ref);
+ free (page->vector);
+ }
+
+ page->vector = iov_dup (vector, count);
+ page->count = count;
+ page->ref = dict_ref (frame->root->rsp_refs);
+ page->ready = 1;
+
+ page->size = iov_length (vector, count);
+
+ waitq = ra_page_wakeup (page);
+ }
+unlock:
+ ra_file_unlock (file);
+
+ ra_waitq_return (waitq);
+
+ fd_unref (local->fd);
+
+ free (frame->local);
+ frame->local = NULL;
+
+ STACK_DESTROY (frame->root);
+ return 0;
+}
+
+
+void
+ra_page_fault (ra_file_t *file,
+ call_frame_t *frame,
+ off_t offset)
+{
+ call_frame_t *fault_frame = NULL;
+ ra_local_t *fault_local = NULL;
+
+ fault_frame = copy_frame (frame);
+ fault_local = CALLOC (1, sizeof (ra_local_t));
+
+ fault_frame->local = fault_local;
+ fault_local->pending_offset = offset;
+ fault_local->pending_size = file->page_size;
+
+ fault_local->fd = fd_ref (file->fd);
+
+ STACK_WIND (fault_frame, ra_fault_cbk,
+ FIRST_CHILD (fault_frame->this),
+ FIRST_CHILD (fault_frame->this)->fops->readv,
+ file->fd, file->page_size, offset);
+ return;
+}
+
+void
+ra_frame_fill (ra_page_t *page, call_frame_t *frame)
+{
+ ra_local_t *local = NULL;
+ ra_fill_t *fill = NULL;
+ off_t src_offset = 0;
+ off_t dst_offset = 0;
+ ssize_t copy_size = 0;
+ ra_fill_t *new = NULL;
+
+
+ local = frame->local;
+ fill = &local->fill;
+
+ if (local->op_ret != -1 && page->size) {
+ if (local->offset > page->offset)
+ src_offset = local->offset - page->offset;
+ else
+ dst_offset = page->offset - local->offset;
+
+ copy_size = min (page->size - src_offset,
+ local->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;
+ }
+
+ fill = fill->next;
+ while (fill != &local->fill) {
+ if (fill->offset > page->offset) {
+ break;
+ }
+ fill = fill->next;
+ }
+
+ new = CALLOC (1, sizeof (*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));
+
+ new->count = iov_subset (page->vector, page->count,
+ src_offset, src_offset+copy_size,
+ new->vector);
+
+ new->next = fill;
+ new->prev = new->next->prev;
+ new->next->prev = new;
+ new->prev->next = new;
+
+ local->op_ret += copy_size;
+ }
+}
+
+
+void
+ra_frame_unwind (call_frame_t *frame)
+{
+ ra_local_t *local = NULL;
+ ra_fill_t *fill = NULL;
+ int32_t count = 0;
+ struct iovec *vector;
+ int32_t copied = 0;
+ dict_t *refs = NULL;
+ ra_fill_t *next = NULL;
+ fd_t *fd = NULL;
+ ra_file_t *file = NULL;
+ int ret = 0;
+ uint64_t tmp_file = 0;
+
+ local = frame->local;
+ fill = local->fill.next;
+
+ refs = get_new_dict ();
+
+ frame->local = NULL;
+
+ while (fill != &local->fill) {
+ count += fill->count;
+ fill = fill->next;
+ }
+
+ vector = CALLOC (count, sizeof (*vector));
+
+ fill = local->fill.next;
+
+ while (fill != &local->fill) {
+ next = fill->next;
+
+ memcpy (((char *)vector) + copied, fill->vector,
+ fill->count * sizeof (*vector));
+
+ copied += (fill->count * sizeof (*vector));
+ dict_copy (fill->refs, refs);
+
+ fill->next->prev = fill->prev;
+ fill->prev->next = fill->prev;
+
+ dict_unref (fill->refs);
+ free (fill->vector);
+ free (fill);
+
+ fill = next;
+ }
+
+ frame->root->rsp_refs = dict_ref (refs);
+
+ fd = local->fd;
+ ret = fd_ctx_get (fd, frame->this, &tmp_file);
+ file = (ra_file_t *)(long)tmp_file;
+
+ STACK_UNWIND (frame, local->op_ret, local->op_errno,
+ vector, count, &file->stbuf);
+
+ dict_unref (refs);
+ pthread_mutex_destroy (&local->local_lock);
+ free (local);
+ free (vector);
+
+ return;
+}
+
+/*
+ * ra_frame_return -
+ * @frame:
+ *
+ */
+void
+ra_frame_return (call_frame_t *frame)
+{
+ ra_local_t *local = NULL;
+ int32_t wait_count = 0;
+
+ local = frame->local;
+ assert (local->wait_count > 0);
+
+ ra_local_lock (local);
+ {
+ wait_count = --local->wait_count;
+ }
+ ra_local_unlock (local);
+
+ if (!wait_count)
+ ra_frame_unwind (frame);
+
+ return;
+}
+
+/*
+ * ra_page_wakeup -
+ * @page:
+ *
+ */
+ra_waitq_t *
+ra_page_wakeup (ra_page_t *page)
+{
+ ra_waitq_t *waitq = NULL, *trav = NULL;
+ call_frame_t *frame;
+
+ waitq = page->waitq;
+ page->waitq = NULL;
+
+ trav = waitq;
+ for (trav = waitq; trav; trav = trav->next) {
+ frame = trav->data;
+ ra_frame_fill (page, frame);
+ }
+
+ return waitq;
+}
+
+/*
+ * ra_page_purge -
+ * @page:
+ *
+ */
+void
+ra_page_purge (ra_page_t *page)
+{
+ page->prev->next = page->next;
+ page->next->prev = page->prev;
+
+ if (page->ref) {
+ dict_unref (page->ref);
+ }
+ free (page->vector);
+ free (page);
+}
+
+/*
+ * ra_page_error -
+ * @page:
+ * @op_ret:
+ * @op_errno:
+ *
+ */
+ra_waitq_t *
+ra_page_error (ra_page_t *page, int32_t op_ret, int32_t op_errno)
+{
+
+ ra_waitq_t *waitq = NULL;
+ ra_waitq_t *trav = NULL;
+ call_frame_t *frame = NULL;
+ ra_local_t *local = NULL;
+
+ waitq = page->waitq;
+ page->waitq = NULL;
+
+ trav = waitq;
+ for (trav = waitq; trav; trav = trav->next) {
+ frame = trav->data;
+
+ local = frame->local;
+ if (local->op_ret != -1) {
+ local->op_ret = op_ret;
+ local->op_errno = op_errno;
+ }
+ }
+
+ ra_page_purge (page);
+
+ return waitq;
+}
+
+/*
+ * ra_file_destroy -
+ * @file:
+ *
+ */
+void
+ra_file_destroy (ra_file_t *file)
+{
+ ra_conf_t *conf = NULL;
+ ra_page_t *trav = NULL;
+
+ conf = file->conf;
+
+ ra_conf_lock (conf);
+ {
+ file->prev->next = file->next;
+ file->next->prev = file->prev;
+ }
+ ra_conf_unlock (conf);
+
+ trav = file->pages.next;
+ while (trav != &file->pages) {
+ ra_page_error (trav, -1, EINVAL);
+ trav = file->pages.next;
+ }
+
+ pthread_mutex_destroy (&file->file_lock);
+ free (file);
+}
+
generated by cgit (git 2.34.1) at 2024-11-13 01:06:46 +0000