mirror of https://github.com/schoebel/mars
1397 lines
33 KiB
C
1397 lines
33 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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//#define BRICK_DEBUGGING
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#define MARS_DEBUGGING
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//#define IO_DEBUGGING
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/blkdev.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include <linux/file.h>
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#include "mars.h"
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#include "lib_timing.h"
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#include "lib_mapfree.h"
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#include "mars_aio.h"
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#define MARS_MAX_AIO 512
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#define MARS_MAX_AIO_READ 32
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/* Self-tune aio_max_nr when possible.
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* This works only when the pre-patch has
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* EXPORT_SYNBOL_GPL(aio_max_nr) and has
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* defined HAS_AIO_MAX.
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*/
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#ifdef HAS_AIO_MAX
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static DEFINE_MUTEX(aio_max_lock);
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int aio_max_nr_current = 0;
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int aio_max_nr_max = 0;
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#endif
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struct timing_stats timings[3] = {};
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struct threshold aio_submit_threshold = {
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.thr_ban = &mars_global_ban,
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.thr_parent = &global_io_threshold,
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.thr_limit = AIO_SUBMIT_MAX_LATENCY,
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.thr_factor = 10,
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.thr_plus = 10000,
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};
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EXPORT_SYMBOL_GPL(aio_submit_threshold);
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struct threshold aio_io_threshold[2] = {
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[0] = {
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.thr_ban = &mars_global_ban,
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.thr_parent = &global_io_threshold,
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.thr_limit = AIO_IO_R_MAX_LATENCY,
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.thr_factor = 100,
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.thr_plus = 0,
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},
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[1] = {
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.thr_ban = &mars_global_ban,
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.thr_parent = &global_io_threshold,
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.thr_limit = AIO_IO_W_MAX_LATENCY,
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.thr_factor = 100,
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.thr_plus = 0,
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},
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};
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EXPORT_SYMBOL_GPL(aio_io_threshold);
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struct threshold aio_sync_threshold = {
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.thr_ban = &mars_global_ban,
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.thr_limit = AIO_SYNC_MAX_LATENCY,
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.thr_factor = 100,
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.thr_plus = 0,
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};
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EXPORT_SYMBOL_GPL(aio_sync_threshold);
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int aio_sync_mode = 2;
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EXPORT_SYMBOL_GPL(aio_sync_mode);
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///////////////////////// own type definitions ////////////////////////
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////////////////// some helpers //////////////////
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#ifdef ENABLE_MARS_AIO
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static inline
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void _enqueue(struct aio_threadinfo *tinfo, struct aio_mref_aspect *mref_a, int prio, bool at_end)
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{
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#if 1
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prio++;
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if (unlikely(prio < 0)) {
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prio = 0;
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} else if (unlikely(prio >= MARS_PRIO_NR)) {
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prio = MARS_PRIO_NR - 1;
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}
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#else
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prio = 0;
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#endif
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mref_a->enqueue_stamp = cpu_clock(raw_smp_processor_id());
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mutex_lock(&tinfo->mutex);
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if (at_end) {
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list_add_tail(&mref_a->io_head, &tinfo->mref_list[prio]);
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} else {
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list_add(&mref_a->io_head, &tinfo->mref_list[prio]);
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}
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tinfo->queued[prio]++;
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atomic_inc(&tinfo->queued_sum);
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mutex_unlock(&tinfo->mutex);
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&tinfo->total_enqueue_count);
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#endif
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wake_up_interruptible_all(&tinfo->event);
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}
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static inline
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struct aio_mref_aspect *_dequeue(struct aio_threadinfo *tinfo)
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{
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struct aio_mref_aspect *mref_a = NULL;
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int prio;
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mutex_lock(&tinfo->mutex);
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for (prio = 0; prio < MARS_PRIO_NR; prio++) {
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struct list_head *start = &tinfo->mref_list[prio];
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struct list_head *tmp = start->next;
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if (tmp != start) {
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list_del_init(tmp);
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tinfo->queued[prio]--;
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atomic_dec(&tinfo->queued_sum);
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mref_a = container_of(tmp, struct aio_mref_aspect, io_head);
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goto done;
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}
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}
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done:
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mutex_unlock(&tinfo->mutex);
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if (likely(mref_a && mref_a->object)) {
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unsigned long long latency;
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int rw = mref_a->object->ref_flags & MREF_WRITE ? 1 : 0;
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latency = cpu_clock(raw_smp_processor_id()) - mref_a->enqueue_stamp;
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threshold_check(&aio_io_threshold[rw], latency);
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}
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return mref_a;
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}
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////////////////// own brick / input / output operations //////////////////
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static
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loff_t get_total_size(struct aio_output *output)
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{
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/* Workaround for races in the page cache.
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* It appears that concurrent reads and writes seem to
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* result in inconsistent reads in some very rare cases, due to
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* races. Sometimes, the inode claims that the file has been already
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* appended by a write operation, but the data has not actually hit
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* the page cache, such that a concurrent read gets NULL blocks.
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*/
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return mf_dirty_length(output->mf, DIRTY_COMPLETED);
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}
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static int aio_ref_get(struct aio_output *output, struct mref_object *mref)
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{
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loff_t total_size;
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if (unlikely(!output->brick->power.led_on))
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return -EBADFD;
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if (unlikely(!output->mf)) {
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MARS_ERR("brick is not switched on\n");
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return -EILSEQ;
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}
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if (unlikely(mref->ref_len <= 0)) {
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MARS_ERR("bad ref_len=%d\n", mref->ref_len);
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return -EILSEQ;
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}
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total_size = get_total_size(output);
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if (unlikely(total_size < 0)) {
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return total_size;
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}
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mref->ref_total_size = total_size;
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if (mref->ref_initialized) {
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_mref_get(mref);
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return mref->ref_len;
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}
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/* Buffered IO.
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*/
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if (!mref->ref_data) {
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struct aio_mref_aspect *mref_a = aio_mref_get_aspect(output->brick, mref);
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if (unlikely(!mref_a)) {
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MARS_ERR("bad mref_a\n");
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return -EILSEQ;
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}
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if (unlikely(mref->ref_len <= 0)) {
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MARS_ERR("bad ref_len = %d\n", mref->ref_len);
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return -ENOMEM;
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}
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mref->ref_data = brick_block_alloc(mref->ref_pos, (mref_a->alloc_len = mref->ref_len));
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if (unlikely(!mref->ref_data)) {
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MARS_ERR("ENOMEM %d bytes\n", mref->ref_len);
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return -ENOMEM;
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}
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mref_a->do_dealloc = true;
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&output->total_alloc_count);
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atomic_inc(&output->alloc_count);
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#endif
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}
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_mref_get_first(mref);
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return mref->ref_len;
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}
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static void aio_ref_put(struct aio_output *output, struct mref_object *mref)
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{
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struct file *file;
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struct aio_mref_aspect *mref_a;
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if (!_mref_put(mref)) {
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goto done;
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}
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if (output->mf && (file = output->mf->mf_filp) && file->f_mapping && file->f_mapping->host) {
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mref->ref_total_size = get_total_size(output);
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}
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mref_a = aio_mref_get_aspect(output->brick, mref);
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if (mref_a && mref_a->do_dealloc) {
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brick_block_free(mref->ref_data, mref_a->alloc_len);
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#ifdef MARS_AIO_DEBUG
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atomic_dec(&output->alloc_count);
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#endif
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}
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aio_free_mref(mref);
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done:;
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}
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static
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void _complete(struct aio_output *output, struct aio_mref_aspect *mref_a, int err)
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{
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struct mref_object *mref;
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bool was_write;
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CHECK_PTR(mref_a, fatal);
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mref = mref_a->object;
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CHECK_PTR(mref, fatal);
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mars_trace(mref, "aio_endio");
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if (err < 0) {
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MARS_ERR("IO error %d at pos=%lld len=%d (mref=%p ref_data=%p)\n", err, mref->ref_pos, mref->ref_len, mref, mref->ref_data);
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} else {
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mref_checksum(mref);
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mref->ref_flags |= MREF_UPTODATE;
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}
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was_write = (mref->ref_flags & MREF_WRITE);
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if (was_write) {
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/* Needs to be done before callback, which might modify
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* mref->.+
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*/
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mf_dirty_append(output->mf, DIRTY_FINISHED, mref->ref_pos + mref->ref_len);
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}
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CHECKED_CALLBACK(mref, err, err_found);
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done:
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if (was_write) {
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atomic_dec(&output->write_count);
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} else {
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atomic_dec(&output->read_count);
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}
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aio_ref_put(output, mref);
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atomic_dec(&output->work_count);
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atomic_dec(&mars_global_io_flying);
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return;
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err_found:
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MARS_FAT("giving up...\n");
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goto done;
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fatal:
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MARS_FAT("bad pointer, giving up...\n");
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}
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static
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void _complete_mref(struct aio_output *output, struct mref_object *mref, int err)
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{
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struct aio_mref_aspect *mref_a;
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_mref_check(mref);
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mref_a = aio_mref_get_aspect(output->brick, mref);
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CHECK_PTR(mref_a, fatal);
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_complete(output, mref_a, err);
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return;
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fatal:
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MARS_FAT("bad pointer, giving up...\n");
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}
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static
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void _complete_all(struct list_head *tmp_list, struct aio_output *output, int err)
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{
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while (!list_empty(tmp_list)) {
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struct list_head *tmp = tmp_list->next;
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struct aio_mref_aspect *mref_a = container_of(tmp, struct aio_mref_aspect, io_head);
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list_del_init(tmp);
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_complete(output, mref_a, err);
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}
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}
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static void aio_ref_io(struct aio_output *output, struct mref_object *mref)
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{
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struct aio_threadinfo *tinfo = &output->tinfo[0];
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struct aio_mref_aspect *mref_a;
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int err = -EINVAL;
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_mref_check(mref);
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if (unlikely(!output->brick->power.led_on)) {
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SIMPLE_CALLBACK(mref, -EBADFD);
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return;
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}
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_mref_get(mref);
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atomic_inc(&mars_global_io_flying);
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atomic_inc(&output->work_count);
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// statistics
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if (mref->ref_flags & MREF_WRITE) {
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&output->total_write_count);
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#endif
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atomic_inc(&output->write_count);
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} else {
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&output->total_read_count);
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#endif
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atomic_inc(&output->read_count);
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}
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if (unlikely(!output->mf || !output->mf->mf_filp)) {
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goto done;
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}
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mapfree_set(output->mf, mref->ref_pos, -1);
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MARS_IO("AIO flags=%ux pos=%lld len=%d data=%p\n",
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mref->ref_flags, mref->ref_pos, mref->ref_len, mref->ref_data);
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mref_a = aio_mref_get_aspect(output->brick, mref);
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if (unlikely(!mref_a)) {
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goto done;
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}
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_enqueue(tinfo, mref_a, mref->ref_prio, true);
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return;
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done:
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_complete_mref(output, mref, err);
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}
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static int aio_submit(struct aio_output *output, struct aio_mref_aspect *mref_a, bool use_fdsync)
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{
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struct mref_object *mref = mref_a->object;
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mm_segment_t oldfs;
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int res;
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__u32 rw = mref->ref_flags & MREF_WRITE ? 1 : 0;
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struct iocb iocb = {
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.aio_data = (__u64)mref_a,
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.aio_lio_opcode = use_fdsync ? IOCB_CMD_FDSYNC : (rw ? IOCB_CMD_PWRITE : IOCB_CMD_PREAD),
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.aio_fildes = output->fd,
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.aio_buf = (unsigned long)mref->ref_data,
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.aio_nbytes = mref->ref_len,
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.aio_offset = mref->ref_pos,
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// .aio_reqprio = something(mref->ref_prio) field exists, but not yet implemented in kernelspace :(
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};
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struct iocb *iocbp = &iocb;
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struct timing_stats *this_timing = &timings[rw];
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unsigned long long latency;
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mars_trace(mref, "aio_submit");
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if (unlikely(output->fd < 0)) {
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MARS_ERR("bad fd = %d\n", output->fd);
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res = -EBADF;
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goto done;
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}
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oldfs = get_fs();
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set_fs(get_ds());
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latency = TIME_STATS(
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this_timing,
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res = sys_io_submit(output->ctxp, 1, &iocbp)
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);
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set_fs(oldfs);
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threshold_check(&aio_submit_threshold, latency);
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&output->total_submit_count);
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#endif
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if (likely(res >= 0)) {
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atomic_inc(&output->submit_count);
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} else if (likely(res == -EAGAIN)) {
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#ifdef MARS_AIO_DEBUG
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atomic_inc(&output->total_again_count);
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#endif
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} else {
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MARS_ERR("error = %d\n", res);
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}
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wake_up_interruptible_all(&output->tinfo[1].event);
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done:
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return res;
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}
|
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|
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static int aio_submit_dummy(struct aio_output *output)
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{
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mm_segment_t oldfs;
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int res;
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int dummy;
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struct iocb iocb = {
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.aio_buf = (__u64)&dummy,
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};
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struct iocb *iocbp = &iocb;
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oldfs = get_fs();
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set_fs(get_ds());
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res = sys_io_submit(output->ctxp, 1, &iocbp);
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set_fs(oldfs);
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|
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if (likely(res >= 0)) {
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atomic_inc(&output->submit_count);
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}
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return res;
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}
|
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|
|
static
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int aio_start_thread(
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struct aio_output *output,
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struct aio_threadinfo *tinfo,
|
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int(*fn)(void*),
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char class)
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{
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int j;
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|
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for (j = 0; j < MARS_PRIO_NR; j++) {
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INIT_LIST_HEAD(&tinfo->mref_list[j]);
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}
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tinfo->output = output;
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mutex_init(&tinfo->mutex);
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init_waitqueue_head(&tinfo->event);
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init_waitqueue_head(&tinfo->terminate_event);
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tinfo->should_terminate = false;
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tinfo->terminated = false;
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tinfo->thread = brick_thread_create(fn, tinfo, "mars_aio_%c%d", class, output->index);
|
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if (unlikely(!tinfo->thread)) {
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MARS_ERR("cannot create thread\n");
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return -ENOENT;
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}
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return 0;
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}
|
|
|
|
static
|
|
void aio_stop_thread(struct aio_output *output, int i, bool do_submit_dummy)
|
|
{
|
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struct aio_threadinfo *tinfo = &output->tinfo[i];
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struct task_struct *thread = tinfo->thread;
|
|
|
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if (thread) {
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MARS_DBG("stopping thread %d ...\n", i);
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tinfo->should_terminate = true;
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|
|
// workaround for waking up the receiver thread. TODO: check whether signal handlong could do better.
|
|
if (do_submit_dummy) {
|
|
MARS_DBG("submitting dummy for wakeup %d...\n", i);
|
|
use_fake_mm();
|
|
aio_submit_dummy(output);
|
|
if (likely(current->mm)) {
|
|
unuse_fake_mm();
|
|
}
|
|
}
|
|
wake_up_interruptible_all(&tinfo->event);
|
|
|
|
// wait for termination
|
|
MARS_DBG("waiting for thread %d ...\n", i);
|
|
wait_event_interruptible_timeout(
|
|
tinfo->terminate_event,
|
|
tinfo->terminated,
|
|
(60 - i * 2) * HZ);
|
|
if (likely(tinfo->terminated)) {
|
|
brick_thread_stop(tinfo->thread);
|
|
} else {
|
|
MARS_ERR("thread %d did not terminate - leaving a zombie\n", i);
|
|
}
|
|
}
|
|
}
|
|
|
|
static
|
|
int aio_sync(struct file *file)
|
|
{
|
|
int err;
|
|
|
|
switch (aio_sync_mode) {
|
|
case 1:
|
|
#if defined(S_BIAS) || (defined(RHEL_MAJOR) && (RHEL_MAJOR < 7))
|
|
err = vfs_fsync_range(file, file->f_path.dentry, 0, LLONG_MAX, 1);
|
|
#else
|
|
err = vfs_fsync_range(file, 0, LLONG_MAX, 1);
|
|
#endif
|
|
break;
|
|
case 2:
|
|
#if defined(S_BIAS) || (defined(RHEL_MAJOR) && (RHEL_MAJOR < 7))
|
|
err = vfs_fsync_range(file, file->f_path.dentry, 0, LLONG_MAX, 0);
|
|
#else
|
|
err = vfs_fsync_range(file, 0, LLONG_MAX, 0);
|
|
#endif
|
|
break;
|
|
default:
|
|
err = filemap_write_and_wait_range(file->f_mapping, 0, LLONG_MAX);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static
|
|
void aio_sync_all(struct aio_output *output, struct list_head *tmp_list)
|
|
{
|
|
unsigned long long latency;
|
|
int err;
|
|
|
|
output->fdsync_active = true;
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_inc(&output->total_fdsync_count);
|
|
#endif
|
|
|
|
latency = TIME_STATS(
|
|
&timings[2],
|
|
err = aio_sync(output->mf->mf_filp)
|
|
);
|
|
|
|
threshold_check(&aio_sync_threshold, latency);
|
|
|
|
output->fdsync_active = false;
|
|
wake_up_interruptible_all(&output->fdsync_event);
|
|
if (err < 0) {
|
|
MARS_ERR("FDSYNC error %d\n", err);
|
|
}
|
|
|
|
/* Signal completion for the whole list.
|
|
* No locking needed, it's on the stack.
|
|
*/
|
|
_complete_all(tmp_list, output, err);
|
|
}
|
|
|
|
/* Workaround for non-implemented aio_fsync()
|
|
*/
|
|
static
|
|
int aio_sync_thread(void *data)
|
|
{
|
|
struct aio_threadinfo *tinfo = data;
|
|
struct aio_output *output = tinfo->output;
|
|
|
|
MARS_DBG("sync thread has started on '%s'.\n", output->brick->brick_path);
|
|
//set_user_nice(current, -20);
|
|
|
|
while (!tinfo->should_terminate || atomic_read(&tinfo->queued_sum) > 0) {
|
|
LIST_HEAD(tmp_list);
|
|
int i;
|
|
|
|
output->fdsync_active = false;
|
|
wake_up_interruptible_all(&output->fdsync_event);
|
|
|
|
wait_event_interruptible_timeout(
|
|
tinfo->event,
|
|
atomic_read(&tinfo->queued_sum) > 0 ||
|
|
tinfo->should_terminate,
|
|
HZ / 4);
|
|
|
|
mutex_lock(&tinfo->mutex);
|
|
for (i = 0; i < MARS_PRIO_NR; i++) {
|
|
struct list_head *start = &tinfo->mref_list[i];
|
|
if (!list_empty(start)) {
|
|
// move over the whole list
|
|
list_replace_init(start, &tmp_list);
|
|
atomic_sub(tinfo->queued[i], &tinfo->queued_sum);
|
|
tinfo->queued[i] = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&tinfo->mutex);
|
|
|
|
if (!list_empty(&tmp_list)) {
|
|
aio_sync_all(output, &tmp_list);
|
|
}
|
|
}
|
|
|
|
MARS_DBG("sync thread has stopped.\n");
|
|
tinfo->terminated = true;
|
|
wake_up_interruptible_all(&tinfo->terminate_event);
|
|
return 0;
|
|
}
|
|
|
|
static int aio_event_thread(void *data)
|
|
{
|
|
struct aio_threadinfo *tinfo = data;
|
|
struct aio_output *output = tinfo->output;
|
|
struct aio_brick *brick = output->brick;
|
|
struct aio_threadinfo *other = &output->tinfo[2];
|
|
struct io_event *events;
|
|
int err = -ENOMEM;
|
|
|
|
events = brick_mem_alloc(sizeof(struct io_event) * MARS_MAX_AIO_READ);
|
|
|
|
MARS_DBG("event thread has started.\n");
|
|
//set_user_nice(current, -20);
|
|
|
|
use_fake_mm();
|
|
if (!current->mm)
|
|
goto err;
|
|
|
|
err = aio_start_thread(output, &output->tinfo[2], aio_sync_thread, 'y');
|
|
if (unlikely(err < 0))
|
|
goto err;
|
|
|
|
while (!tinfo->should_terminate || atomic_read(&tinfo->queued_sum) > 0) {
|
|
mm_segment_t oldfs;
|
|
int count;
|
|
int i;
|
|
struct lamport_time timeout = {
|
|
.tv_nsec =
|
|
tinfo->should_terminate ||
|
|
!brick->power.button ? 0 : 100000,
|
|
};
|
|
|
|
if (unlikely(!(void*)output->ctxp)) {
|
|
MARS_ERR("Oops, context vanished. queued_sum = %d\n", atomic_read(&tinfo->queued_sum));
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_MARS_DEBUG
|
|
if (mars_hang_mode & 1) {
|
|
brick_msleep(100);
|
|
continue;
|
|
}
|
|
#endif
|
|
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
/* TODO: don't timeout upon termination.
|
|
* Probably we should submit a dummy request.
|
|
*/
|
|
count = sys_io_getevents(output->ctxp, 1, MARS_MAX_AIO_READ, events, &timeout);
|
|
set_fs(oldfs);
|
|
|
|
if (count > 0) {
|
|
atomic_sub(count, &output->submit_count);
|
|
} else if (!count) {
|
|
wait_event_interruptible_timeout(
|
|
tinfo->event,
|
|
atomic_read(&output->submit_count) > 0 ||
|
|
tinfo->should_terminate,
|
|
HZ / 4);
|
|
continue;
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
struct aio_mref_aspect *mref_a = (void*)events[i].data;
|
|
struct mref_object *mref;
|
|
int err = events[i].res;
|
|
|
|
if (!mref_a) {
|
|
continue; // this was a dummy request
|
|
}
|
|
mref = mref_a->object;
|
|
|
|
MARS_IO("AIO done %p pos = %lld len = %d flags = %ux\n",
|
|
mref, mref->ref_pos, mref->ref_len,
|
|
mref->ref_flags);
|
|
|
|
mapfree_set(output->mf, mref->ref_pos, mref->ref_pos + mref->ref_len);
|
|
if (mref->ref_flags & MREF_WRITE)
|
|
mf_dirty_append(output->mf, DIRTY_COMPLETED, mref->ref_pos + mref->ref_len);
|
|
|
|
/* Workaround for never implemented aio_fsync operation,
|
|
* see also upstream commit 723c038475b78edc9327eb952f95f9881cc9d7.
|
|
* FIXME: don't use aio anymore at all in the long-term future.
|
|
*/
|
|
if (output->brick->o_fdsync &&
|
|
err >= 0 &&
|
|
(mref->ref_flags & MREF_WRITE) &&
|
|
!(mref->ref_flags & MREF_SKIP_SYNC) &&
|
|
!mref_a->resubmit++) {
|
|
mars_trace(mref, "aio_fsync");
|
|
_enqueue(other, mref_a, mref->ref_prio, true);
|
|
continue;
|
|
}
|
|
|
|
_complete(output, mref_a, err);
|
|
|
|
}
|
|
}
|
|
err = 0;
|
|
|
|
err:
|
|
MARS_DBG("event thread has stopped, err = %d\n", err);
|
|
|
|
aio_stop_thread(output, 2, false);
|
|
|
|
unuse_fake_mm();
|
|
|
|
tinfo->terminated = true;
|
|
wake_up_interruptible_all(&tinfo->terminate_event);
|
|
brick_mem_free(events);
|
|
return err;
|
|
}
|
|
|
|
#if 1
|
|
/* This should go to fs/open.c (as long as vfs_submit() is not implemented)
|
|
*/
|
|
#include <linux/fdtable.h>
|
|
void fd_uninstall(unsigned int fd)
|
|
{
|
|
struct files_struct *files = current->files;
|
|
struct fdtable *fdt;
|
|
unsigned long flags;
|
|
|
|
MARS_DBG("fd = %d\n", fd);
|
|
if (unlikely(fd < 0)) {
|
|
MARS_ERR("bad fd = %d\n", fd);
|
|
return;
|
|
}
|
|
spin_lock_irqsave(&files->file_lock, flags);
|
|
fdt = files_fdtable(files);
|
|
rcu_assign_pointer(fdt->fd[fd], NULL);
|
|
spin_unlock_irqrestore(&files->file_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(fd_uninstall);
|
|
#endif
|
|
|
|
static
|
|
atomic_t ioctx_count = ATOMIC_INIT(0);
|
|
static DEFINE_MUTEX(_fd_lock);
|
|
|
|
static
|
|
void _destroy_ioctx(struct aio_output *output)
|
|
{
|
|
int fd;
|
|
|
|
if (unlikely(!output))
|
|
goto done;
|
|
|
|
aio_stop_thread(output, 1, true);
|
|
|
|
use_fake_mm();
|
|
|
|
if (likely(output->ctxp)) {
|
|
mm_segment_t oldfs;
|
|
int err;
|
|
|
|
MARS_DBG("ioctx count = %d destroying %p\n", atomic_read(&ioctx_count), (void*)output->ctxp);
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
err = sys_io_destroy(output->ctxp);
|
|
set_fs(oldfs);
|
|
atomic_dec(&ioctx_count);
|
|
MARS_DBG("ioctx count = %d status = %d\n", atomic_read(&ioctx_count), err);
|
|
output->ctxp = 0;
|
|
#ifdef HAS_AIO_MAX
|
|
mutex_lock(&aio_max_lock);
|
|
aio_max_nr_current -= MARS_MAX_AIO;
|
|
mutex_unlock(&aio_max_lock);
|
|
#endif
|
|
}
|
|
|
|
fd = output->fd;
|
|
if (likely(fd >= 0)) {
|
|
MARS_DBG("destroying fd %d\n", fd);
|
|
mutex_lock(&_fd_lock);
|
|
fd_uninstall(fd);
|
|
put_unused_fd(fd);
|
|
output->fd = -1;
|
|
mutex_unlock(&_fd_lock);
|
|
}
|
|
|
|
done:
|
|
if (likely(current->mm)) {
|
|
unuse_fake_mm();
|
|
}
|
|
}
|
|
|
|
/* TODO: this is provisionary. We only need it for sys_io_submit()
|
|
* which uses userspace concepts like file handles.
|
|
* This should be replaced by a future kernelsapce vfs_submit() or
|
|
* do_submit() which currently does not exist :(
|
|
* Or, the whole aio brick should be replaced by something else.
|
|
* A good candidate could be the new {read,write}_iter() infrastructure.
|
|
* But only present at newer kernels.
|
|
* Unfortunately I will have to support old kernels for a while :(
|
|
*/
|
|
static int _get_fd(void)
|
|
{
|
|
struct files_struct *files;
|
|
int err = -EINVAL;
|
|
int count = 0;
|
|
|
|
do {
|
|
mutex_lock(&_fd_lock);
|
|
|
|
files = current->files;
|
|
CHECK_PTR(files, done);
|
|
|
|
/* Workaround upstream bug:
|
|
* Commit 8a81252b774b53e628a8a0fe18e2b8fc236d92cc
|
|
* forgot to initialize the new field resize_wait in
|
|
* fs/file.c in the initializer of init_files.
|
|
* We detect whether this commit is present via neighbor
|
|
* commit a7928c1578c550bd6f4dec62d65132e6db226c57
|
|
* which removed the ancient define for blk_pm_request.
|
|
* Once the bug is fixed in all relevant upstream LTS kernels
|
|
* and in all relevant distro kernels, this hack should be
|
|
* removed again.
|
|
*/
|
|
#ifndef blk_pm_request
|
|
/* Upstream commit 2055da97389a605c8a00d163d40903afbe413921
|
|
* changed the field name.
|
|
* Detected via 8ada92799ec4de00f4bc0f10b1ededa256c1ab22
|
|
*/
|
|
#ifdef wait_event_killable_timeout
|
|
#define XXX_NAME head
|
|
#else
|
|
#define XXX_NAME task_list
|
|
#endif
|
|
if (unlikely(!files->resize_wait.XXX_NAME.next)) {
|
|
files->resize_in_progress = false;
|
|
init_waitqueue_head(&files->resize_wait);
|
|
}
|
|
#endif
|
|
|
|
/* see f938612dd97d481b8b5bf960c992ae577f081c17
|
|
* and 1a7bd2265fc57f29400d57f66275cc5918e30aa6
|
|
*/
|
|
#if defined(get_unused_fd) || defined(get_unused_fd_flags)
|
|
err = get_unused_fd();
|
|
#else
|
|
err = get_unused_fd_flags(0);
|
|
#endif
|
|
mutex_unlock(&_fd_lock);
|
|
/* safety workaround: skip standard Unix filehandles */
|
|
} while (err >= 0 && err <= 2 && count++ < 3);
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static
|
|
int _create_ioctx(struct aio_output *output)
|
|
{
|
|
struct file *file;
|
|
mm_segment_t oldfs;
|
|
int err = -EINVAL;
|
|
|
|
CHECK_PTR_NULL(output, done);
|
|
CHECK_PTR_NULL(output->mf, done);
|
|
file = output->mf->mf_filp;
|
|
CHECK_PTR_NULL(file, done);
|
|
|
|
err = _get_fd();
|
|
MARS_DBG("file %p '%s' new fd = %d\n", file, output->mf->mf_name, err);
|
|
if (unlikely(err < 0)) {
|
|
MARS_ERR("cannot get fd, err=%d\n", err);
|
|
goto done;
|
|
}
|
|
output->fd = err;
|
|
fd_install(err, file);
|
|
|
|
use_fake_mm();
|
|
|
|
err = -ENOMEM;
|
|
if (unlikely(!current->mm)) {
|
|
MARS_ERR("cannot fake mm\n");
|
|
goto done;
|
|
}
|
|
|
|
#ifdef HAS_AIO_MAX
|
|
/* Self-tune aio_max_nr when possible. */
|
|
mutex_lock(&aio_max_lock);
|
|
aio_max_nr_current += MARS_MAX_AIO;
|
|
if (aio_max_nr_current > aio_max_nr_max) {
|
|
int diff = aio_max_nr_current - aio_max_nr_max;
|
|
|
|
aio_max_nr += diff;
|
|
aio_max_nr_max = aio_max_nr_current;
|
|
}
|
|
mutex_unlock(&aio_max_lock);
|
|
#endif
|
|
|
|
MARS_DBG("ioctx count = %d old = %p\n", atomic_read(&ioctx_count), (void*)output->ctxp);
|
|
output->ctxp = 0;
|
|
|
|
oldfs = get_fs();
|
|
set_fs(get_ds());
|
|
err = sys_io_setup(MARS_MAX_AIO, &output->ctxp);
|
|
set_fs(oldfs);
|
|
if (likely(output->ctxp))
|
|
atomic_inc(&ioctx_count);
|
|
MARS_DBG("ioctx count = %d new = %p status = %d\n", atomic_read(&ioctx_count), (void*)output->ctxp, err);
|
|
if (unlikely(err < 0)) {
|
|
MARS_ERR("io_setup failed, err=%d\n", err);
|
|
goto done;
|
|
}
|
|
|
|
err = aio_start_thread(output, &output->tinfo[1], aio_event_thread, 'e');
|
|
if (unlikely(err < 0)) {
|
|
MARS_ERR("could not start event thread\n");
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
if (likely(current->mm)) {
|
|
unuse_fake_mm();
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int aio_submit_thread(void *data)
|
|
{
|
|
struct aio_threadinfo *tinfo = data;
|
|
struct aio_output *output = tinfo->output;
|
|
struct file *file;
|
|
int err = -EINVAL;
|
|
|
|
MARS_DBG("submit thread has started.\n");
|
|
|
|
file = output->mf->mf_filp;
|
|
|
|
use_fake_mm();
|
|
|
|
while (!tinfo->should_terminate || atomic_read(&output->read_count) + atomic_read(&output->write_count) + atomic_read(&tinfo->queued_sum) > 0) {
|
|
struct aio_mref_aspect *mref_a;
|
|
struct mref_object *mref;
|
|
int sleeptime;
|
|
int status;
|
|
|
|
wait_event_interruptible_timeout(
|
|
tinfo->event,
|
|
atomic_read(&tinfo->queued_sum) > 0 ||
|
|
tinfo->should_terminate,
|
|
HZ / 4);
|
|
|
|
mref_a = _dequeue(tinfo);
|
|
if (!mref_a) {
|
|
continue;
|
|
}
|
|
|
|
mref = mref_a->object;
|
|
status = -EINVAL;
|
|
CHECK_PTR(mref, error);
|
|
|
|
mapfree_set(output->mf, mref->ref_pos, -1);
|
|
|
|
if (mref->ref_flags & MREF_WRITE) {
|
|
mf_dirty_append(output->mf, DIRTY_SUBMITTED, mref->ref_pos + mref->ref_len);
|
|
}
|
|
|
|
mref->ref_total_size = get_total_size(output);
|
|
|
|
/* Check for reads crossing the EOF boundary (special case)
|
|
*/
|
|
if (!(mref->ref_flags & MREF_WRITE) &&
|
|
mref->ref_pos + mref->ref_len > mref->ref_total_size) {
|
|
loff_t len;
|
|
|
|
/* Timeout handling, ONLY possible for reads
|
|
* beyond EOF.
|
|
* Currently not used! Needed for a future feature.
|
|
*/
|
|
if (mref->ref_timeout > 0) {
|
|
if (!mref_a->start_jiffies)
|
|
mref_a->start_jiffies = jiffies;
|
|
if ((long long)jiffies - mref_a->start_jiffies <= mref->ref_timeout) {
|
|
if (atomic_read(&tinfo->queued_sum) <= 0) {
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_inc(&output->total_msleep_count);
|
|
#endif
|
|
brick_msleep(1000 * 4 / HZ);
|
|
}
|
|
_enqueue(tinfo, mref_a, MARS_PRIO_LOW, true);
|
|
continue;
|
|
}
|
|
|
|
MARS_DBG("ENODATA %lld\n", len);
|
|
_complete(output, mref_a, -ENODATA);
|
|
continue;
|
|
}
|
|
/* Shorten reads crossing EOF.
|
|
*/
|
|
len = mref->ref_total_size - mref->ref_pos;
|
|
if (len > 0 && mref->ref_len > len)
|
|
mref->ref_len = len;
|
|
}
|
|
|
|
sleeptime = 1;
|
|
for (;;) {
|
|
status = aio_submit(output, mref_a, false);
|
|
|
|
if (likely(status != -EAGAIN)) {
|
|
break;
|
|
}
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_inc(&output->total_delay_count);
|
|
#endif
|
|
brick_msleep(sleeptime);
|
|
if (sleeptime < 100) {
|
|
sleeptime++;
|
|
}
|
|
}
|
|
|
|
error:
|
|
if (unlikely(status < 0)) {
|
|
MARS_IO("submit_count = %d status = %d\n", atomic_read(&output->submit_count), status);
|
|
_complete_mref(output, mref, status);
|
|
}
|
|
}
|
|
|
|
MARS_DBG("submit thread has stopped, status = %d.\n", err);
|
|
|
|
if (likely(current->mm)) {
|
|
unuse_fake_mm();
|
|
}
|
|
|
|
tinfo->terminated = true;
|
|
wake_up_interruptible_all(&tinfo->terminate_event);
|
|
return err;
|
|
}
|
|
|
|
static int aio_get_info(struct aio_output *output, struct mars_info *info)
|
|
{
|
|
struct file *file;
|
|
|
|
if (unlikely(!output ||
|
|
!output->mf ||
|
|
!(file = output->mf->mf_filp) ||
|
|
!file->f_mapping ||
|
|
!file->f_mapping->host))
|
|
return -EINVAL;
|
|
|
|
info->tf_align = 1;
|
|
info->tf_min_size = 1;
|
|
info->current_size = get_total_size(output);
|
|
|
|
MARS_DBG("determined file size = %lld\n", info->current_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
//////////////// informational / statistics ///////////////
|
|
|
|
static noinline
|
|
char *aio_statistics(struct aio_brick *brick, int verbose)
|
|
{
|
|
struct aio_output *output = brick->outputs[0];
|
|
char *res = brick_string_alloc(4096);
|
|
char *sync = NULL;
|
|
int pos = 0;
|
|
if (!res)
|
|
return NULL;
|
|
|
|
pos += report_timing(&timings[0], res + pos, 4096 - pos);
|
|
pos += report_timing(&timings[1], res + pos, 4096 - pos);
|
|
pos += report_timing(&timings[2], res + pos, 4096 - pos);
|
|
|
|
snprintf(res + pos, 4096 - pos,
|
|
#ifdef MARS_AIO_DEBUG
|
|
"total "
|
|
"reads = %d "
|
|
"writes = %d "
|
|
"allocs = %d "
|
|
"submits = %d "
|
|
"again = %d "
|
|
"delays = %d "
|
|
"msleeps = %d "
|
|
"fdsyncs = %d "
|
|
"fdsync_waits = %d "
|
|
"map_free = %d | "
|
|
#endif
|
|
"flying reads = %d "
|
|
"writes = %d "
|
|
#ifdef MARS_AIO_DEBUG
|
|
"allocs = %d "
|
|
#endif
|
|
"submits = %d "
|
|
"q0 = %d "
|
|
"q1 = %d "
|
|
"q2 = %d "
|
|
#ifdef MARS_AIO_DEBUG
|
|
"| total "
|
|
"q0 = %d "
|
|
"q1 = %d "
|
|
"q2 = %d "
|
|
#endif
|
|
"%s\n",
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_read(&output->total_read_count),
|
|
atomic_read(&output->total_write_count),
|
|
atomic_read(&output->total_alloc_count),
|
|
atomic_read(&output->total_submit_count),
|
|
atomic_read(&output->total_again_count),
|
|
atomic_read(&output->total_delay_count),
|
|
atomic_read(&output->total_msleep_count),
|
|
atomic_read(&output->total_fdsync_count),
|
|
atomic_read(&output->total_fdsync_wait_count),
|
|
atomic_read(&output->total_mapfree_count),
|
|
#endif
|
|
atomic_read(&output->read_count),
|
|
atomic_read(&output->write_count),
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_read(&output->alloc_count),
|
|
#endif
|
|
atomic_read(&output->submit_count),
|
|
atomic_read(&output->tinfo[0].queued_sum),
|
|
atomic_read(&output->tinfo[1].queued_sum),
|
|
atomic_read(&output->tinfo[2].queued_sum),
|
|
#ifdef MARS_AIO_DEBUG
|
|
atomic_read(&output->tinfo[0].total_enqueue_count),
|
|
atomic_read(&output->tinfo[1].total_enqueue_count),
|
|
atomic_read(&output->tinfo[2].total_enqueue_count),
|
|
#endif
|
|
sync ? sync : "");
|
|
|
|
brick_string_free(sync);
|
|
|
|
return res;
|
|
}
|
|
|
|
static noinline
|
|
void aio_reset_statistics(struct aio_brick *brick)
|
|
{
|
|
#ifdef MARS_AIO_DEBUG
|
|
struct aio_output *output = brick->outputs[0];
|
|
int i;
|
|
|
|
atomic_set(&output->total_read_count, 0);
|
|
atomic_set(&output->total_write_count, 0);
|
|
atomic_set(&output->total_alloc_count, 0);
|
|
atomic_set(&output->total_submit_count, 0);
|
|
atomic_set(&output->total_again_count, 0);
|
|
atomic_set(&output->total_delay_count, 0);
|
|
atomic_set(&output->total_msleep_count, 0);
|
|
atomic_set(&output->total_fdsync_count, 0);
|
|
atomic_set(&output->total_fdsync_wait_count, 0);
|
|
atomic_set(&output->total_mapfree_count, 0);
|
|
for (i = 0; i < 3; i++) {
|
|
struct aio_threadinfo *tinfo = &output->tinfo[i];
|
|
|
|
atomic_set(&tinfo->total_enqueue_count, 0);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#endif /* ENABLE_MARS_AIO */
|
|
//////////////// object / aspect constructors / destructors ///////////////
|
|
|
|
static int aio_mref_aspect_init_fn(struct generic_aspect *_ini)
|
|
{
|
|
struct aio_mref_aspect *ini = (void*)_ini;
|
|
INIT_LIST_HEAD(&ini->io_head);
|
|
return 0;
|
|
}
|
|
|
|
static void aio_mref_aspect_exit_fn(struct generic_aspect *_ini)
|
|
{
|
|
struct aio_mref_aspect *ini = (void*)_ini;
|
|
CHECK_HEAD_EMPTY(&ini->io_head);
|
|
}
|
|
|
|
MARS_MAKE_STATICS(aio);
|
|
|
|
#ifdef ENABLE_MARS_AIO
|
|
////////////////////// brick constructors / destructors ////////////////////
|
|
|
|
static int aio_brick_construct(struct aio_brick *brick)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int aio_switch(struct aio_brick *brick)
|
|
{
|
|
static int index;
|
|
struct aio_output *output = brick->outputs[0];
|
|
const char *path = output->brick->brick_path;
|
|
int flags = O_RDWR | O_LARGEFILE;
|
|
int status = 0;
|
|
|
|
MARS_DBG("power.button = %d\n", brick->power.button);
|
|
if (!brick->power.button)
|
|
goto cleanup;
|
|
|
|
if (brick->power.led_on || output->mf)
|
|
goto done;
|
|
|
|
mars_power_led_off((void*)brick, false);
|
|
|
|
flags |= O_LARGEFILE;
|
|
if (brick->o_creat) {
|
|
flags |= (O_NOFOLLOW | O_CREAT);
|
|
MARS_DBG("using O_CREAT on %s\n", path);
|
|
}
|
|
if (brick->o_direct) {
|
|
flags |= O_DIRECT;
|
|
MARS_DBG("using O_DIRECT on %s\n", path);
|
|
}
|
|
|
|
output->mf = mapfree_get(path, flags);
|
|
if (unlikely(!output->mf)) {
|
|
MARS_ERR("could not open file = '%s' flags = %d\n", path, flags);
|
|
status = -ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
output->index = ++index;
|
|
|
|
status = _create_ioctx(output);
|
|
if (unlikely(status < 0)) {
|
|
MARS_ERR("could not create ioctx, status = %d\n", status);
|
|
goto err;
|
|
}
|
|
|
|
status = aio_start_thread(output, &output->tinfo[0], aio_submit_thread, 's');
|
|
if (unlikely(status < 0)) {
|
|
MARS_ERR("could not start theads, status = %d\n", status);
|
|
goto err;
|
|
}
|
|
|
|
MARS_DBG("opened file '%s'\n", path);
|
|
brick->mode_ptr = &output->mf->mf_mode;
|
|
mars_power_led_on((void*)brick, true);
|
|
|
|
done:
|
|
return 0;
|
|
|
|
err:
|
|
MARS_ERR("status = %d\n", status);
|
|
cleanup:
|
|
if (brick->power.led_off) {
|
|
goto done;
|
|
}
|
|
|
|
mars_power_led_on((void*)brick, false);
|
|
|
|
for (;;) {
|
|
int count = atomic_read(&output->work_count);
|
|
if (count <= 0)
|
|
break;
|
|
MARS_DBG("working on %d requests\n", count);
|
|
brick_msleep(1000);
|
|
}
|
|
|
|
aio_stop_thread(output, 0, false);
|
|
|
|
brick->mode_ptr = NULL;
|
|
|
|
_destroy_ioctx(output);
|
|
|
|
mars_power_led_off((void*)brick,
|
|
(output->tinfo[0].thread == NULL &&
|
|
output->tinfo[1].thread == NULL &&
|
|
output->tinfo[2].thread == NULL));
|
|
|
|
MARS_DBG("switch off led_off = %d status = %d\n", brick->power.led_off, status);
|
|
if (brick->power.led_off) {
|
|
if (output->mf) {
|
|
MARS_DBG("closing file = '%s'\n", output->mf->mf_name);
|
|
mapfree_put(output->mf);
|
|
output->mf = NULL;
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
static int aio_output_construct(struct aio_output *output)
|
|
{
|
|
init_waitqueue_head(&output->fdsync_event);
|
|
output->fd = -1;
|
|
return 0;
|
|
}
|
|
|
|
static int aio_output_destruct(struct aio_output *output)
|
|
{
|
|
if (unlikely(output->fd >= 0)) {
|
|
MARS_ERR("active fd = %d detected\n", output->fd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
///////////////////////// static structs ////////////////////////
|
|
|
|
static struct aio_brick_ops aio_brick_ops = {
|
|
.brick_switch = aio_switch,
|
|
.brick_statistics = aio_statistics,
|
|
.reset_statistics = aio_reset_statistics,
|
|
};
|
|
|
|
static struct aio_output_ops aio_output_ops = {
|
|
.mref_get = aio_ref_get,
|
|
.mref_put = aio_ref_put,
|
|
.mref_io = aio_ref_io,
|
|
.mars_get_info = aio_get_info,
|
|
};
|
|
|
|
const struct aio_input_type aio_input_type = {
|
|
.type_name = "aio_input",
|
|
.input_size = sizeof(struct aio_input),
|
|
};
|
|
|
|
static const struct aio_input_type *aio_input_types[] = {
|
|
&aio_input_type,
|
|
};
|
|
|
|
const struct aio_output_type aio_output_type = {
|
|
.type_name = "aio_output",
|
|
.output_size = sizeof(struct aio_output),
|
|
.master_ops = &aio_output_ops,
|
|
.output_construct = &aio_output_construct,
|
|
.output_destruct = &aio_output_destruct,
|
|
};
|
|
|
|
static const struct aio_output_type *aio_output_types[] = {
|
|
&aio_output_type,
|
|
};
|
|
|
|
#endif /* ENABLE_MARS_AIO */
|
|
|
|
const struct aio_brick_type aio_brick_type = {
|
|
.type_name = "aio_brick",
|
|
.brick_size = sizeof(struct aio_brick),
|
|
.max_inputs = 0,
|
|
.max_outputs = 1,
|
|
#ifdef ENABLE_MARS_AIO
|
|
.master_ops = &aio_brick_ops,
|
|
.aspect_types = aio_aspect_types,
|
|
.default_input_types = aio_input_types,
|
|
.default_output_types = aio_output_types,
|
|
.brick_construct = &aio_brick_construct,
|
|
#else /* ENABLE_MARS_AIO */
|
|
.aspect_types = aio_aspect_types, /* dummy, shut up gcc */
|
|
#endif /* ENABLE_MARS_AIO */
|
|
};
|
|
EXPORT_SYMBOL_GPL(aio_brick_type);
|
|
|
|
////////////////// module init stuff /////////////////////////
|
|
|
|
int __init init_mars_aio(void)
|
|
{
|
|
MARS_DBG("init_aio()\n");
|
|
_aio_brick_type = (void*)&aio_brick_type;
|
|
return aio_register_brick_type();
|
|
}
|
|
|
|
void exit_mars_aio(void)
|
|
{
|
|
MARS_DBG("exit_aio()\n");
|
|
aio_unregister_brick_type();
|
|
}
|