Exemplo n.º 1
0
Arquivo: zvol.c Projeto: koplover/zfs
static MAKE_REQUEST_FN_RET
zvol_request(struct request_queue *q, struct bio *bio)
{
	zvol_state_t *zv = q->queuedata;
	fstrans_cookie_t cookie = spl_fstrans_mark();
	uint64_t offset = BIO_BI_SECTOR(bio);
	unsigned int sectors = bio_sectors(bio);
	int rw = bio_data_dir(bio);
#ifdef HAVE_GENERIC_IO_ACCT
	unsigned long start = jiffies;
#endif
	int error = 0;

	if (bio_has_data(bio) && offset + sectors >
	    get_capacity(zv->zv_disk)) {
		printk(KERN_INFO
		    "%s: bad access: block=%llu, count=%lu\n",
		    zv->zv_disk->disk_name,
		    (long long unsigned)offset,
		    (long unsigned)sectors);
		error = SET_ERROR(EIO);
		goto out1;
	}

	generic_start_io_acct(rw, sectors, &zv->zv_disk->part0);

	if (rw == WRITE) {
		if (unlikely(zv->zv_flags & ZVOL_RDONLY)) {
			error = SET_ERROR(EROFS);
			goto out2;
		}

		if (bio->bi_rw & VDEV_REQ_DISCARD) {
			error = zvol_discard(bio);
			goto out2;
		}

		error = zvol_write(bio);
	} else
		error = zvol_read(bio);

out2:
	generic_end_io_acct(rw, &zv->zv_disk->part0, start);
out1:
	BIO_END_IO(bio, -error);
	spl_fstrans_unmark(cookie);
#ifdef HAVE_MAKE_REQUEST_FN_RET_INT
	return (0);
#elif defined(HAVE_MAKE_REQUEST_FN_RET_QC)
	return (BLK_QC_T_NONE);
#endif
}
Exemplo n.º 2
0
Arquivo: zvol.c Projeto: alek-p/zfs
static MAKE_REQUEST_FN_RET
zvol_request(struct request_queue *q, struct bio *bio)
{
	uio_t uio;
	zvol_state_t *zv = q->queuedata;
	fstrans_cookie_t cookie = spl_fstrans_mark();
	int rw = bio_data_dir(bio);
#ifdef HAVE_GENERIC_IO_ACCT
	unsigned long start = jiffies;
#endif
	int error = 0;

	uio.uio_bvec = &bio->bi_io_vec[BIO_BI_IDX(bio)];
	uio.uio_skip = BIO_BI_SKIP(bio);
	uio.uio_resid = BIO_BI_SIZE(bio);
	uio.uio_iovcnt = bio->bi_vcnt - BIO_BI_IDX(bio);
	uio.uio_loffset = BIO_BI_SECTOR(bio) << 9;
	uio.uio_limit = MAXOFFSET_T;
	uio.uio_segflg = UIO_BVEC;

	if (bio_has_data(bio) && uio.uio_loffset + uio.uio_resid >
	    zv->zv_volsize) {
		printk(KERN_INFO
		    "%s: bad access: offset=%llu, size=%lu\n",
		    zv->zv_disk->disk_name,
		    (long long unsigned)uio.uio_loffset,
		    (long unsigned)uio.uio_resid);
		error = SET_ERROR(EIO);
		goto out1;
	}

	generic_start_io_acct(rw, bio_sectors(bio), &zv->zv_disk->part0);

	if (rw == WRITE) {
		if (unlikely(zv->zv_flags & ZVOL_RDONLY)) {
			error = SET_ERROR(EROFS);
			goto out2;
		}

		if (bio_is_discard(bio) || bio_is_secure_erase(bio)) {
			error = zvol_discard(bio);
			goto out2;
		}

		/*
		 * Some requests are just for flush and nothing else.
		 */
		if (uio.uio_resid == 0) {
			if (bio_is_flush(bio))
				zil_commit(zv->zv_zilog, ZVOL_OBJ);
			goto out2;
		}

		error = zvol_write(zv, &uio,
		    bio_is_flush(bio) || bio_is_fua(bio) ||
		    zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS);
	} else
		error = zvol_read(zv, &uio);

out2:
	generic_end_io_acct(rw, &zv->zv_disk->part0, start);
out1:
	BIO_END_IO(bio, -error);
	spl_fstrans_unmark(cookie);
#ifdef HAVE_MAKE_REQUEST_FN_RET_INT
	return (0);
#elif defined(HAVE_MAKE_REQUEST_FN_RET_QC)
	return (BLK_QC_T_NONE);
#endif
}