summaryrefslogtreecommitdiffstats
path: root/xlators/experimental/fdl/src/fdl-tmpl.c
diff options
context:
space:
mode:
Diffstat (limited to 'xlators/experimental/fdl/src/fdl-tmpl.c')
-rw-r--r--xlators/experimental/fdl/src/fdl-tmpl.c536
1 files changed, 0 insertions, 536 deletions
diff --git a/xlators/experimental/fdl/src/fdl-tmpl.c b/xlators/experimental/fdl/src/fdl-tmpl.c
deleted file mode 100644
index 145dad7..0000000
--- a/xlators/experimental/fdl/src/fdl-tmpl.c
+++ /dev/null
@@ -1,536 +0,0 @@
-/*
- Copyright (c) 2015 Red Hat, Inc. <http://www.redhat.com>
- This file is part of GlusterFS.
-
- This file is licensed to you under your choice of the GNU Lesser
- General Public License, version 3 or any later version (LGPLv3 or
- later), or the GNU General Public License, version 2 (GPLv2), in all
- cases as published by the Free Software Foundation.
-*/
-
-#ifndef _CONFIG_H
-#define _CONFIG_H
-#include "config.h"
-#endif
-
-#include <fcntl.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include "call-stub.h"
-#include "iatt.h"
-#include "defaults.h"
-#include "syscall.h"
-#include "xlator.h"
-#include "fdl.h"
-
-/* TBD: make tunable */
-#define META_FILE_SIZE (1 << 20)
-#define DATA_FILE_SIZE (1 << 24)
-
-enum gf_fdl {
- gf_fdl_mt_fdl_private_t = gf_common_mt_end + 1,
- gf_fdl_mt_end
-};
-
-typedef struct {
- char *type;
- off_t size;
- char *path;
- int fd;
- void * ptr;
- off_t max_offset;
-} log_obj_t;
-
-typedef struct {
- struct list_head reqs;
- pthread_mutex_t req_lock;
- pthread_cond_t req_cond;
- char *log_dir;
- pthread_t worker;
- gf_boolean_t should_stop;
- gf_boolean_t change_term;
- log_obj_t meta_log;
- log_obj_t data_log;
- int term;
- int first_term;
-} fdl_private_t;
-
-int32_t
-fdl_ipc (call_frame_t *frame, xlator_t *this, int32_t op, dict_t *xdata);
-
-void
-fdl_enqueue (xlator_t *this, call_stub_t *stub)
-{
- fdl_private_t *priv = this->private;
-
- pthread_mutex_lock (&priv->req_lock);
- list_add_tail (&stub->list, &priv->reqs);
- pthread_mutex_unlock (&priv->req_lock);
-
- pthread_cond_signal (&priv->req_cond);
-}
-
-#pragma generate
-
-char *
-fdl_open_term_log (xlator_t *this, log_obj_t *obj, int term)
-{
- fdl_private_t *priv = this->private;
- int ret;
- char * ptr = NULL;
-
- /*
- * Use .jnl instead of .log so that we don't get test info (mistakenly)
- * appended to our journal files.
- */
- if (this->ctx->cmd_args.log_ident) {
- ret = gf_asprintf (&obj->path, "%s/%s-%s-%d.jnl",
- priv->log_dir, this->ctx->cmd_args.log_ident,
- obj->type, term);
- }
- else {
- ret = gf_asprintf (&obj->path, "%s/fubar-%s-%d.jnl",
- priv->log_dir, obj->type, term);
- }
- if ((ret <= 0) || !obj->path) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to construct log-file path");
- goto err;
- }
-
- gf_log (this->name, GF_LOG_INFO, "opening %s (size %ld)",
- obj->path, obj->size);
-
- obj->fd = open (obj->path, O_RDWR|O_CREAT|O_TRUNC, 0666);
- if (obj->fd < 0) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to open log file (%s)", strerror(errno));
- goto err;
- }
-
-#if !defined(GF_BSD_HOST_OS)
- /*
- * NetBSD can just go die in a fire. Even though it claims to support
- * fallocate/posix_fallocate they don't actually *do* anything so the
- * file size remains zero. Then mmap succeeds anyway, but any access
- * to the mmap'ed region will segfault. It would be acceptable for
- * fallocate to do what it says, for mmap to fail, or for access to
- * extend the file. NetBSD managed to hit the trifecta of Getting
- * Everything Wrong, and debugging in that environment to get this far
- * has already been painful enough (systems I worked on in 1990 were
- * better that way). We'll fall through to the lseek/write method, and
- * performance will be worse, and TOO BAD.
- */
- if (sys_fallocate(obj->fd,0,0,obj->size) < 0)
-#endif
- {
- gf_log (this->name, GF_LOG_WARNING,
- "failed to fallocate space for log file");
- /* Have to do this the ugly page-faulty way. */
- (void) sys_lseek (obj->fd, obj->size-1, SEEK_SET);
- (void) sys_write (obj->fd, "", 1);
- }
-
- ptr = mmap (NULL, obj->size, PROT_WRITE, MAP_SHARED, obj->fd, 0);
- if (ptr == MAP_FAILED) {
- gf_log (this->name, GF_LOG_ERROR, "failed to mmap log (%s)",
- strerror(errno));
- goto err;
- }
-
- obj->ptr = ptr;
- obj->max_offset = 0;
- return ptr;
-
-err:
- if (obj->fd >= 0) {
- sys_close (obj->fd);
- obj->fd = (-1);
- }
- if (obj->path) {
- GF_FREE (obj->path);
- obj->path = NULL;
- }
- return ptr;
-}
-
-void
-fdl_close_term_log (xlator_t *this, log_obj_t *obj)
-{
- fdl_private_t *priv = this->private;
-
- if (obj->ptr) {
- (void) munmap (obj->ptr, obj->size);
- obj->ptr = NULL;
- }
-
- if (obj->fd >= 0) {
- gf_log (this->name, GF_LOG_INFO,
- "truncating term %d %s journal to %ld",
- priv->term, obj->type, obj->max_offset);
- if (sys_ftruncate(obj->fd,obj->max_offset) < 0) {
- gf_log (this->name, GF_LOG_WARNING,
- "failed to truncate journal (%s)",
- strerror(errno));
- }
- sys_close (obj->fd);
- obj->fd = (-1);
- }
-
- if (obj->path) {
- GF_FREE (obj->path);
- obj->path = NULL;
- }
-}
-
-gf_boolean_t
-fdl_change_term (xlator_t *this, char **meta_ptr, char **data_ptr)
-{
- fdl_private_t *priv = this->private;
-
- fdl_close_term_log (this, &priv->meta_log);
- fdl_close_term_log (this, &priv->data_log);
-
- ++(priv->term);
-
- *meta_ptr = fdl_open_term_log (this, &priv->meta_log, priv->term);
- if (!*meta_ptr) {
- return _gf_false;
- }
-
- *data_ptr = fdl_open_term_log (this, &priv->data_log, priv->term);
- if (!*data_ptr) {
- return _gf_false;
- }
-
- return _gf_true;
-}
-
-void *
-fdl_worker (void *arg)
-{
- xlator_t *this = arg;
- fdl_private_t *priv = this->private;
- call_stub_t *stub;
- char * meta_ptr = NULL;
- off_t *meta_offset = &priv->meta_log.max_offset;
- char * data_ptr = NULL;
- off_t *data_offset = &priv->data_log.max_offset;
- unsigned long base_as_ul;
- void * msync_ptr;
- size_t msync_len;
- gf_boolean_t recycle;
- void *err_label = &&err_unlocked;
-
- priv->meta_log.type = "meta";
- priv->meta_log.size = META_FILE_SIZE;
- priv->meta_log.path = NULL;
- priv->meta_log.fd = (-1);
- priv->meta_log.ptr = NULL;
-
- priv->data_log.type = "data";
- priv->data_log.size = DATA_FILE_SIZE;
- priv->data_log.path = NULL;
- priv->data_log.fd = (-1);
- priv->data_log.ptr = NULL;
-
- /* TBD: initial term should come from persistent storage (e.g. etcd) */
- priv->first_term = ++(priv->term);
- meta_ptr = fdl_open_term_log (this, &priv->meta_log, priv->term);
- if (!meta_ptr) {
- goto *err_label;
- }
- data_ptr = fdl_open_term_log (this, &priv->data_log, priv->term);
- if (!data_ptr) {
- fdl_close_term_log (this, &priv->meta_log);
- goto *err_label;
- }
-
- for (;;) {
- pthread_mutex_lock (&priv->req_lock);
- err_label = &&err_locked;
- while (list_empty(&priv->reqs)) {
- pthread_cond_wait (&priv->req_cond, &priv->req_lock);
- if (priv->should_stop) {
- goto *err_label;
- }
- if (priv->change_term) {
- if (!fdl_change_term(this, &meta_ptr,
- &data_ptr)) {
- goto *err_label;
- }
- priv->change_term = _gf_false;
- continue;
- }
- }
- stub = list_entry (priv->reqs.next, call_stub_t, list);
- list_del_init (&stub->list);
- pthread_mutex_unlock (&priv->req_lock);
- err_label = &&err_unlocked;
- /*
- * TBD: batch requests
- *
- * What we should do here is gather up *all* of the requests
- * that have accumulated since we were last at this point,
- * blast them all out in one big writev, and then dispatch them
- * all before coming back for more. That maximizes throughput,
- * at some cost to latency (due to queuing effects at the log
- * stage). Note that we're likely to be above io-threads, so
- * the dispatch itself will be parallelized (at further cost to
- * latency). For now, we just do the simplest thing and handle
- * one request all the way through before fetching the next.
- *
- * So, why mmap/msync instead of writev/fdatasync? Because it's
- * faster. Much faster. So much faster that I half-suspect
- * cheating, but it's more convenient for now than having to
- * ensure that everything's page-aligned for O_DIRECT (the only
- * alternative that still might avoid ridiculous levels of
- * local-FS overhead).
- *
- * TBD: check that msync really does get our data to disk.
- */
- gf_log (this->name, GF_LOG_DEBUG,
- "logging %u+%u bytes for op %d",
- stub->jnl_meta_len, stub->jnl_data_len, stub->fop);
- recycle = _gf_false;
- if ((*meta_offset + stub->jnl_meta_len) > priv->meta_log.size) {
- recycle = _gf_true;
- }
- if ((*data_offset + stub->jnl_data_len) > priv->data_log.size) {
- recycle = _gf_true;
- }
- if (recycle && !fdl_change_term(this,&meta_ptr,&data_ptr)) {
- goto *err_label;
- }
- meta_ptr = priv->meta_log.ptr;
- data_ptr = priv->data_log.ptr;
- gf_log (this->name, GF_LOG_DEBUG, "serializing to %p/%p",
- meta_ptr + *meta_offset, data_ptr + *data_offset);
- stub->serialize (stub, meta_ptr + *meta_offset,
- data_ptr + *data_offset);
- if (stub->jnl_meta_len > 0) {
- base_as_ul = (unsigned long) (meta_ptr + *meta_offset);
- msync_ptr = (void *) (base_as_ul & ~0x0fff);
- msync_len = (size_t) (base_as_ul & 0x0fff);
- if (msync (msync_ptr, msync_len+stub->jnl_meta_len,
- MS_SYNC) < 0) {
- gf_log (this->name, GF_LOG_WARNING,
- "failed to log request meta (%s)",
- strerror(errno));
- }
- *meta_offset += stub->jnl_meta_len;
- }
- if (stub->jnl_data_len > 0) {
- base_as_ul = (unsigned long) (data_ptr + *data_offset);
- msync_ptr = (void *) (base_as_ul & ~0x0fff);
- msync_len = (size_t) (base_as_ul & 0x0fff);
- if (msync (msync_ptr, msync_len+stub->jnl_data_len,
- MS_SYNC) < 0) {
- gf_log (this->name, GF_LOG_WARNING,
- "failed to log request data (%s)",
- strerror(errno));
- }
- *data_offset += stub->jnl_data_len;
- }
- call_resume (stub);
- }
-
-err_locked:
- pthread_mutex_unlock (&priv->req_lock);
-err_unlocked:
- fdl_close_term_log (this, &priv->meta_log);
- fdl_close_term_log (this, &priv->data_log);
- return NULL;
-}
-
-int32_t
-fdl_ipc_continue (call_frame_t *frame, xlator_t *this,
- int32_t op, dict_t *xdata)
-{
- /*
- * Nothing to be done here. Just Unwind. *
- */
- STACK_UNWIND_STRICT (ipc, frame, 0, 0, xdata);
-
- return 0;
-}
-
-int32_t
-fdl_ipc (call_frame_t *frame, xlator_t *this, int32_t op, dict_t *xdata)
-{
- call_stub_t *stub;
- fdl_private_t *priv = this->private;
- dict_t *tdict;
- int32_t gt_err = EIO;
-
- switch (op) {
-
- case FDL_IPC_CHANGE_TERM:
- gf_log (this->name, GF_LOG_INFO, "got CHANGE_TERM op");
- priv->change_term = _gf_true;
- pthread_cond_signal (&priv->req_cond);
- STACK_UNWIND_STRICT (ipc, frame, 0, 0, NULL);
- break;
-
- case FDL_IPC_GET_TERMS:
- gf_log (this->name, GF_LOG_INFO, "got GET_TERMS op");
- tdict = dict_new ();
- if (!tdict) {
- gt_err = ENOMEM;
- goto gt_done;
- }
- if (dict_set_int32(tdict,"first",priv->first_term) != 0) {
- goto gt_done;
- }
- if (dict_set_int32(tdict,"last",priv->term) != 0) {
- goto gt_done;
- }
- gt_err = 0;
- gt_done:
- if (gt_err) {
- STACK_UNWIND_STRICT (ipc, frame, -1, gt_err, NULL);
- } else {
- STACK_UNWIND_STRICT (ipc, frame, 0, 0, tdict);
- }
- if (tdict) {
- dict_unref (tdict);
- }
- break;
-
- case FDL_IPC_JBR_SERVER_ROLLBACK:
- /*
- * In case of a rollback from jbr-server, dump *
- * the term and index number in the journal, *
- * which will later be used to rollback the fop *
- */
- stub = fop_ipc_stub (frame, fdl_ipc_continue,
- op, xdata);
- fdl_len_ipc (stub);
- stub->serialize = fdl_serialize_ipc;
- fdl_enqueue (this, stub);
-
- break;
-
- default:
- STACK_WIND_TAIL (frame,
- FIRST_CHILD(this),
- FIRST_CHILD(this)->fops->ipc,
- op, xdata);
- }
-
- return 0;
-}
-
-int
-fdl_init (xlator_t *this)
-{
- fdl_private_t *priv = NULL;
-
- priv = GF_CALLOC (1, sizeof (*priv), gf_fdl_mt_fdl_private_t);
- if (!priv) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to allocate fdl_private");
- goto err;
- }
-
- INIT_LIST_HEAD (&priv->reqs);
- if (pthread_mutex_init (&priv->req_lock, NULL) != 0) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to initialize req_lock");
- goto err;
- }
- if (pthread_cond_init (&priv->req_cond, NULL) != 0) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to initialize req_cond");
- goto err;
- }
-
- GF_OPTION_INIT ("log-path", priv->log_dir, path, err);
-
- this->private = priv;
- /*
- * The rest of the fop table is automatically generated, so this is a
- * bit cleaner than messing with the generation to add a hand-written
- * exception.
- */
-
- if (gf_thread_create (&priv->worker, NULL, fdl_worker, this,
- "fdlwrker") != 0) {
- gf_log (this->name, GF_LOG_ERROR,
- "failed to start fdl_worker");
- goto err;
- }
-
- return 0;
-
-err:
- if (priv) {
- GF_FREE(priv);
- }
- return -1;
-}
-
-void
-fdl_fini (xlator_t *this)
-{
- fdl_private_t *priv = this->private;
-
- if (priv) {
- priv->should_stop = _gf_true;
- pthread_cond_signal (&priv->req_cond);
- pthread_join (priv->worker, NULL);
- GF_FREE(priv);
- }
-}
-
-int
-fdl_reconfigure (xlator_t *this, dict_t *options)
-{
- fdl_private_t *priv = this->private;
-
- GF_OPTION_RECONF ("log_dir", priv->log_dir, options, path, out);
- /* TBD: react if it changed */
-
-out:
- return 0;
-}
-
-int32_t
-mem_acct_init (xlator_t *this)
-{
- int ret = -1;
-
- GF_VALIDATE_OR_GOTO ("fdl", this, out);
-
- ret = xlator_mem_acct_init (this, gf_fdl_mt_end + 1);
-
- if (ret != 0) {
- gf_log (this->name, GF_LOG_ERROR, "Memory accounting init"
- "failed");
- return ret;
- }
-out:
- return ret;
-}
-
-class_methods_t class_methods = {
- .init = fdl_init,
- .fini = fdl_fini,
- .reconfigure = fdl_reconfigure,
- .notify = default_notify,
-};
-
-struct volume_options options[] = {
- { .key = {"log-path"},
- .type = GF_OPTION_TYPE_PATH,
- .default_value = DEFAULT_LOG_FILE_DIRECTORY,
- .description = "Directory for FDL files."
- },
- { .key = {NULL} },
-};
-
-struct xlator_cbks cbks = {
- .release = default_release,
- .releasedir = default_releasedir,
- .forget = default_forget,
-};