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https://github.com/schoebel/mars
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import mars-05.tgz
This commit is contained in:
Thomas Schoebel-Theuer
parent
7552314757
commit
7f9d7f8568
2
Kconfig
2
Kconfig
@ -29,7 +29,7 @@ config MARS_DEVICE_SIO
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Experimental storage System.
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config MARS_TEST
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tristate "provisionary"
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tristate "provisionary TEST"
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depends on MARS
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default m
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---help---
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6
mars.h
6
mars.h
@ -12,10 +12,12 @@
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#define _NORMAL_CODE(X) X
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#endif
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#define MARS_INFO "MARS_INFO: "
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#define MARS_ERROR "MARS_ERROR: "
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#define MARS_INFO "MARS_INFO: "
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#define MARS_DEBUG "MARS_DEBUG: "
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#define MARS_ERR(args...) printk(MARS_ERROR args)
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#define MARS_INF(args...) printk(MARS_INFO args)
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//#define MARS_DBG(args...) printk("MARS_DEBUG: " args)
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#define MARS_DBG(args...) /**/
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@ -454,11 +456,11 @@ extern inline int INPUT_PREFIX##_##OUTPUT_PREFIX####_disconnect( \
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#define MARS_IO(PREFIX) \
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GENERIC_OBJECT(PREFIX); \
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struct bio *orig_bio; \
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struct bio *mars_bio; \
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int (*mars_endio)(struct mars_io *mio); \
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struct mars_io {
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MARS_IO(mars);
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struct list_head io_head; //TODO: move to aspect
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};
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#define MARS_BRICK(PREFIX) \
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@ -3,9 +3,13 @@
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#include <linux/kernel.h>
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#include <linux/module.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/highmem.h>
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#include <linux/kthread.h>
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#include <linux/spinlock.h>
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#include <linux/wait.h>
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#include "mars.h"
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@ -15,19 +19,124 @@
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////////////////// own brick / input / output operations //////////////////
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static int transfer_none(int cmd,
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struct page *raw_page, unsigned raw_off,
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struct page *loop_page, unsigned loop_off,
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int size)
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{
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char *raw_buf = kmap_atomic(raw_page, KM_USER0) + raw_off;
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char *loop_buf = kmap_atomic(loop_page, KM_USER1) + loop_off;
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if (cmd == READ)
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memcpy(loop_buf, raw_buf, size);
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else
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memcpy(raw_buf, loop_buf, size);
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kunmap_atomic(raw_buf, KM_USER0);
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kunmap_atomic(loop_buf, KM_USER1);
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cond_resched();
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return 0;
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}
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static int device_sio_write_aops(struct device_sio_output *output, struct mars_io *mio)
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{
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struct bio *bio = mio->orig_bio;
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loff_t pos = ((loff_t)bio->bi_sector << 9);
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struct file *file = output->filp;
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struct address_space *mapping = file->f_mapping;
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struct bio_vec *bvec;
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int i;
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int ret = -EIO;
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mutex_lock(&mapping->host->i_mutex);
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bio_for_each_segment(bvec, bio, i) {
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//pgoff_t index;
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unsigned offset, bv_offs;
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int len;
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//index = pos >> PAGE_CACHE_SHIFT;
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offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
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bv_offs = bvec->bv_offset;
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len = bvec->bv_len;
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while (len > 0) {
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int transfer_result;
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unsigned size, copied;
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struct page *page;
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void *fsdata;
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size = PAGE_CACHE_SIZE - offset;
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if (size > len)
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size = len;
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ret = pagecache_write_begin(file, mapping, pos, size, 0,
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&page, &fsdata);
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if (ret)
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goto fail;
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//file_update_time(file);
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transfer_result = transfer_none(WRITE, page, offset, bvec->bv_page, bv_offs, size);
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copied = size;
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if (transfer_result)
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copied = 0;
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ret = pagecache_write_end(file, mapping, pos, size, copied,
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page, fsdata);
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if (ret < 0 || ret != copied)
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goto fail;
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if (unlikely(transfer_result))
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goto fail;
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bv_offs += copied;
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len -= copied;
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offset = 0;
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//index++;
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pos += copied;
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}
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ret = 0;
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continue;
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fail:
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ret = -EIO;
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}
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mutex_unlock(&mapping->host->i_mutex);
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if (!ret)
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bio->bi_size = 0;
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mio->mars_endio(mio);
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blk_run_address_space(mapping);
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return ret;
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}
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static int device_sio_mars_io(struct device_sio_output *output, struct mars_io *mio)
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{
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struct bio *bio = mio->orig_bio;
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int direction = bio->bi_rw & 1;
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//unsigned int nr_sectors = bio_sectors(bio);
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unsigned long sector = bio->bi_sector;
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unsigned long long pos = sector << 9; //TODO: allow different sector sizes
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bool barrier = (direction != READ && bio_rw_flagged(bio, BIO_RW_BARRIER));
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struct bio_vec *bvec;
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int i;
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int ret = -EIO;
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if (barrier) {
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MARS_INF("got barrier request\n");
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}
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if (!output->filp)
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goto done;
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#if 1
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if (direction == WRITE) {
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return device_sio_write_aops(output, mio);
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}
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#endif
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bio_for_each_segment(bvec, bio, i) {
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mm_segment_t oldfs;
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@ -40,10 +149,11 @@ static int device_sio_mars_io(struct device_sio_output *output, struct mars_io *
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oldfs = get_fs();
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set_fs(get_ds());
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if (direction == READ)
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if (direction == READ) {
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ret = do_sync_read(output->filp, addr, len, &ppos);
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else
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} else {
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ret = do_sync_write(output->filp, addr, len, &ppos);
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}
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set_fs(oldfs);
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kunmap(bvec->bv_page);
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@ -57,7 +167,20 @@ static int device_sio_mars_io(struct device_sio_output *output, struct mars_io *
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MARS_ERR("IO error pos=%llu, len=%u, status=%d\n", pos, len, ret);
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goto done;
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}
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#if 0
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if (direction == WRITE) {
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struct inode *inode = output->filp->f_dentry->d_inode;
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struct address_space *mapping = inode->i_mapping;
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int res;
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res = sync_page_range(inode, mapping, pos, len);
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if (res) {
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MARS_ERR("syncing pages failed: %d\n", res);
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}
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}
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#endif
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pos += len;
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bio->bi_size -= len;
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ret = 0;
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@ -68,6 +191,49 @@ done:
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return ret;
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}
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#ifdef WITH_THREAD
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static int device_sio_mars_queue(struct device_sio_output *output, struct mars_io *mio)
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{
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MARS_DBG("queue %p\n", mio);
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spin_lock_irq(&output->lock);
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list_add_tail(&mio->io_head, &output->mio_list);
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spin_unlock_irq(&output->lock);
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wake_up(&output->event);
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return 0;
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}
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static int device_sio_thread(void *data)
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{
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struct device_sio_output *output = data;
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MARS_INF("kthread has started.\n");
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//set_user_nice(current, -20);
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while (!kthread_should_stop()) {
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struct mars_io *mio;
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wait_event_interruptible(output->event,
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!list_empty(&output->mio_list) ||
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kthread_should_stop());
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if (list_empty(&output->mio_list))
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continue;
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spin_lock_irq(&output->lock);
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mio = container_of(output->mio_list.next, struct mars_io, io_head);
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spin_unlock_irq(&output->lock);
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MARS_DBG("got %p\n", mio);
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device_sio_mars_io(output, mio);
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}
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MARS_INF("kthread has stopped.\n");
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return 0;
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}
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#endif
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//////////////////////// constructors / destructors //////////////////////
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static int device_sio_brick_construct(struct device_sio_brick *brick)
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@ -94,13 +260,40 @@ static int device_sio_output_construct(struct device_sio_output *output)
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return err;
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}
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#if 0
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{
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struct address_space *mapping = output->filp->f_mapping;
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int old_gfp_mask = mapping_gfp_mask(mapping);
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mapping_set_gfp_mask(mapping, old_gfp_mask & ~(__GFP_IO|__GFP_FS));
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}
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#endif
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#ifdef WITH_THREAD
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spin_lock_init(&output->lock);
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init_waitqueue_head(&output->event);
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INIT_LIST_HEAD(&output->mio_list);
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output->thread = kthread_create(device_sio_thread, output, "mars_sio%d", 0);
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if (IS_ERR(output->thread)) {
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int error = PTR_ERR(output->thread);
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MARS_ERR("cannot create thread, status=%d\n", error);
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filp_close(output->filp, NULL);
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return error;
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}
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wake_up_process(output->thread);
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#endif
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return 0;
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}
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static int device_sio_output_destruct(struct device_sio_output *output)
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{
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#ifdef WITH_THREAD
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kthread_stop(output->thread);
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output->thread = NULL;
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#endif
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if (output->filp) {
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filp_close(output->filp, NULL);
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output->filp = NULL;
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}
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return 0;
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@ -112,7 +305,11 @@ static struct device_sio_brick_ops device_sio_brick_ops = {
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};
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static struct device_sio_output_ops device_sio_output_ops = {
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#ifdef WITH_THREAD
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.mars_io = device_sio_mars_queue,
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#else
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.mars_io = device_sio_mars_io,
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#endif
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};
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static struct device_sio_output_type device_sio_output_type = {
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@ -1,4 +1,6 @@
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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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//#define WITH_THREAD
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struct device_sio_brick {
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MARS_BRICK(device_sio);
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};
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@ -10,6 +12,12 @@ struct device_sio_input {
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struct device_sio_output {
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MARS_OUTPUT(device_sio);
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struct file *filp;
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#ifdef WITH_THREAD
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struct list_head mio_list;
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struct task_struct *thread;
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wait_queue_head_t event;
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spinlock_t lock;
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#endif
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};
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MARS_TYPES(device_sio);
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@ -38,6 +38,7 @@ static int if_device_endio(struct mars_io *mio)
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}
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} // else lower layers have already signalled the orig_bio
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kfree(mio);
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return 0;
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}
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@ -65,7 +66,6 @@ static int if_device_make_request(struct request_queue *q, struct bio *bio)
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goto err;
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mio->orig_bio = bio;
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mio->mars_bio = NULL;
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mio->mars_endio = if_device_endio;
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error = output->ops->mars_io(output, mio);
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@ -107,6 +107,15 @@ static const struct block_device_operations if_device_blkdev_ops = {
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////////////////// own brick / input / output operations //////////////////
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static void if_device_unplug(struct request_queue *q)
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{
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//struct if_device_input *input = q->queuedata;
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MARS_DBG("UNPLUG\n");
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queue_flag_clear_unlocked(QUEUE_FLAG_PLUGGED, q);
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//blk_run_address_space(lo->lo_backing_file->f_mapping);
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}
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//////////////////////// contructors / destructors ////////////////////////
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static int if_device_brick_construct(struct if_device_brick *brick)
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@ -132,7 +141,7 @@ static int if_device_input_construct(struct if_device_input *input)
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MARS_ERR("cannot allocate device request queue\n");
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return -ENOMEM;
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}
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q->queuedata = input;
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q->queuedata = input;
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input->q = q;
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MARS_DBG("2\n");
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@ -156,6 +165,8 @@ static int if_device_input_construct(struct if_device_input *input)
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blk_queue_make_request(q, if_device_make_request);
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blk_queue_max_segment_size(q, MARS_MAX_SEGMENT_SIZE);
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blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
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q->unplug_fn = if_device_unplug;
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blk_queue_ordered(q, QUEUE_ORDERED_DRAIN, NULL);//???
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MARS_DBG("4\n");
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input->bdev = bdget(MKDEV(disk->major, minor));
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@ -171,7 +182,6 @@ static int if_device_input_construct(struct if_device_input *input)
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blk_queue_merge_bvec(q, mars_merge_bvec);
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q->queue_lock = &input->req_lock; /* needed since we use */
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/* plugging on a queue, that actually has no requests! */
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q->unplug_fn = mars_unplug_fn;
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#endif
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MARS_DBG("99999\n");
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