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Commit a43c8316 authored by Anton Ivanov's avatar Anton Ivanov Committed by Richard Weinberger
Browse files

um: Switch to block-mq constants in the UML UBD driver 



Switch to block mq-constants for both commands, error codes and
various computations.

Signed-off-by: default avatarAnton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 550ed0e2

arch/um/drivers/ubd_kern.c

+38 −28
Original line number Diff line number Diff line
@@ -43,11 +43,11 @@ 
#include <os.h>

#include "cow.h"



enum ubd_req { UBD_READ, UBD_WRITE, UBD_FLUSH };

/* Max request size is determined by sector mask - 32K */

#define UBD_MAX_REQUEST (8 * sizeof(long))



struct io_thread_req {

	struct request *req;

	enum ubd_req op;

	int fds[2];

	unsigned long offsets[2];

	unsigned long long offset;
@@ -511,15 +511,13 @@ static void ubd_handler(void) 
		}

		for (count = 0; count < n/sizeof(struct io_thread_req *); count++) {

			struct io_thread_req *io_req = (*irq_req_buffer)[count];

			int err = io_req->error ? BLK_STS_IOERR : BLK_STS_OK;



			if (!blk_update_request(io_req->req, err, io_req->length))

				__blk_mq_end_request(io_req->req, err);

			if (!blk_update_request(io_req->req, io_req->error, io_req->length))

				__blk_mq_end_request(io_req->req, io_req->error);



			kfree(io_req);

		}

	}



	reactivate_fd(thread_fd, UBD_IRQ);

}
@@ -789,7 +787,7 @@ static int ubd_open_dev(struct ubd *ubd_dev) 


	if((fd == -ENOENT) && create_cow){

		fd = create_cow_file(ubd_dev->file, ubd_dev->cow.file,

					  ubd_dev->openflags, 1 << 9, PAGE_SIZE,

					  ubd_dev->openflags, SECTOR_SIZE, PAGE_SIZE,

					  &ubd_dev->cow.bitmap_offset,

					  &ubd_dev->cow.bitmap_len,

					  &ubd_dev->cow.data_offset);
@@ -830,6 +828,7 @@ static int ubd_open_dev(struct ubd *ubd_dev) 
		if(err < 0) goto error;

		ubd_dev->cow.fd = err;

	}

	blk_queue_flag_set(QUEUE_FLAG_NONROT, ubd_dev->queue);

	return 0;

 error:

	os_close_file(ubd_dev->fd);
@@ -882,7 +881,7 @@ static int ubd_disk_register(int major, u64 size, int unit, 
	return 0;

}



#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))

#define ROUND_BLOCK(n) ((n + (SECTOR_SIZE - 1)) & (-SECTOR_SIZE))



static const struct blk_mq_ops ubd_mq_ops = {

	.queue_rq = ubd_queue_rq,
@@ -1234,10 +1233,10 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, 
			  __u64 bitmap_offset, unsigned long *bitmap_words,

			  __u64 bitmap_len)

{

	__u64 sector = io_offset >> 9;

	__u64 sector = io_offset >> SECTOR_SHIFT;

	int i, update_bitmap = 0;



	for(i = 0; i < length >> 9; i++){

	for (i = 0; i < length >> SECTOR_SHIFT; i++) {

		if(cow_mask != NULL)

			ubd_set_bit(i, (unsigned char *) cow_mask);

		if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
@@ -1271,14 +1270,14 @@ static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask, 
static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,

		       __u64 bitmap_offset, __u64 bitmap_len)

{

	__u64 sector = req->offset >> 9;

	__u64 sector = req->offset >> SECTOR_SHIFT;

	int i;



	if(req->length > (sizeof(req->sector_mask) * 8) << 9)

	if (req->length > (sizeof(req->sector_mask) * 8) << SECTOR_SHIFT)

		panic("Operation too long");



	if(req->op == UBD_READ) {

		for(i = 0; i < req->length >> 9; i++){

	if (req_op(req->req) == REQ_OP_READ) {

		for (i = 0; i < req->length >> SECTOR_SHIFT; i++) {

			if(ubd_test_bit(sector + i, (unsigned char *) bitmap))

				ubd_set_bit(i, (unsigned char *)

					    &req->sector_mask);
@@ -1307,19 +1306,16 @@ static int ubd_queue_one_vec(struct blk_mq_hw_ctx *hctx, struct request *req, 
		io_req->fds[0] = dev->fd;

	io_req->error = 0;



	if (req_op(req) == REQ_OP_FLUSH) {

		io_req->op = UBD_FLUSH;

	} else {

	if (req_op(req) != REQ_OP_FLUSH) {

		io_req->fds[1] = dev->fd;

		io_req->cow_offset = -1;

		io_req->offset = off;

		io_req->length = bvec->bv_len;

		io_req->sector_mask = 0;

		io_req->op = rq_data_dir(req) == READ ? UBD_READ : UBD_WRITE;

		io_req->offsets[0] = 0;

		io_req->offsets[1] = dev->cow.data_offset;

		io_req->buffer = page_address(bvec->bv_page) + bvec->bv_offset;

		io_req->sectorsize = 1 << 9;

		io_req->sectorsize = SECTOR_SIZE;



		if (dev->cow.file) {

			cowify_req(io_req, dev->cow.bitmap,
@@ -1353,7 +1349,7 @@ static blk_status_t ubd_queue_rq(struct blk_mq_hw_ctx *hctx, 
	} else {

		struct req_iterator iter;

		struct bio_vec bvec;

		u64 off = (u64)blk_rq_pos(req) << 9;

		u64 off = (u64)blk_rq_pos(req) << SECTOR_SHIFT;



		rq_for_each_segment(bvec, req, iter) {

			ret = ubd_queue_one_vec(hctx, req, off, &bvec);
@@ -1413,22 +1409,36 @@ static int ubd_ioctl(struct block_device *bdev, fmode_t mode, 
	return -EINVAL;

}



static int map_error(int error_code)

{

	switch (error_code) {

	case 0:

		return BLK_STS_OK;

	case ENOSYS:

	case EOPNOTSUPP:

		return BLK_STS_NOTSUPP;

	case ENOSPC:

		return BLK_STS_NOSPC;

	}

	return BLK_STS_IOERR;

}



static int update_bitmap(struct io_thread_req *req)

{

	int n;



	if(req->cow_offset == -1)

		return 0;

		return map_error(0);



	n = os_pwrite_file(req->fds[1], &req->bitmap_words,

			  sizeof(req->bitmap_words), req->cow_offset);

	if(n != sizeof(req->bitmap_words)){

		printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,

		       req->fds[1]);

		return 1;

		return map_error(-n);

	}



	return 0;

	return map_error(0);

}



static void do_io(struct io_thread_req *req)
@@ -1438,13 +1448,13 @@ static void do_io(struct io_thread_req *req) 
	int n, nsectors, start, end, bit;

	__u64 off;



	if (req->op == UBD_FLUSH) {

	if (req_op(req->req) == REQ_OP_FLUSH) {

		/* fds[0] is always either the rw image or our cow file */

		n = os_sync_file(req->fds[0]);

		if (n != 0) {

			printk("do_io - sync failed err = %d "

			       "fd = %d\n", -n, req->fds[0]);

			req->error = 1;

			req->error = map_error(-n);

		}

		return;

	}
@@ -1464,7 +1474,7 @@ static void do_io(struct io_thread_req *req) 
		len = (end - start) * req->sectorsize;

		buf = &req->buffer[start * req->sectorsize];



		if(req->op == UBD_READ){

		if (req_op(req->req) == REQ_OP_READ) {

			n = 0;

			do {

				buf = &buf[n];
@@ -1473,7 +1483,7 @@ static void do_io(struct io_thread_req *req) 
				if (n < 0) {

					printk("do_io - read failed, err = %d "

					       "fd = %d\n", -n, req->fds[bit]);

					req->error = 1;

					req->error = map_error(-n);

					return;

				}

			} while((n < len) && (n != 0));
@@ -1483,7 +1493,7 @@ static void do_io(struct io_thread_req *req) 
			if(n != len){

				printk("do_io - write failed err = %d "

				       "fd = %d\n", -n, req->fds[bit]);

				req->error = 1;

				req->error = map_error(-n);

				return;

			}

		}