From 558b9ef00e128b2c97df6e4243152af3d0da3653 Mon Sep 17 00:00:00 2001 From: Stefan Weinhuber Date: Fri, 16 Aug 2013 15:57:32 +0200 Subject: [PATCH] s390/dasd: enable raw_track_access reads without direct I/O The ECKD protocol supports reading of tracks with arbitrary format as raw track images. The DASD device driver supports this in its raw_track_access mode. In this mode it maps each track to sixteen 4096 byte sectors and rejects all requests that are not properly aligned to this mapping. An application that wants to use a DASD in raw_track_access mode will usually use direct I/O to make sure that properly aligned requests are directly submitted to the driver. However, applications that are not aware of this mode, e.g. udev, will encounter I/O errors. To make the use without direct I/O possible and avoid this kind of alignment errors, we now pad unaligned read requests with a dummy page, so that we can always read full tracks. Please note that writing is still only possible for full track images that are properly aligned. Signed-off-by: Stefan Weinhuber Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd_eckd.c | 54 +++++++++++++++++++++++++++------- 1 file changed, 43 insertions(+), 11 deletions(-) diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index e61a6deea3c0..5adb2042e824 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -85,6 +85,8 @@ MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids); static struct ccw_driver dasd_eckd_driver; /* see below */ +static void *rawpadpage; + #define INIT_CQR_OK 0 #define INIT_CQR_UNFORMATTED 1 #define INIT_CQR_ERROR 2 @@ -3237,18 +3239,26 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, unsigned int seg_len, len_to_track_end; unsigned int first_offs; unsigned int cidaw, cplength, datasize; - sector_t first_trk, last_trk; + sector_t first_trk, last_trk, sectors; + sector_t start_padding_sectors, end_sector_offset, end_padding_sectors; unsigned int pfx_datasize; /* * raw track access needs to be mutiple of 64k and on 64k boundary + * For read requests we can fix an incorrect alignment by padding + * the request with dummy pages. */ - if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) { - cqr = ERR_PTR(-EINVAL); - goto out; - } - if (((blk_rq_pos(req) + blk_rq_sectors(req)) % - DASD_RAW_SECTORS_PER_TRACK) != 0) { + start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK; + end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) % + DASD_RAW_SECTORS_PER_TRACK; + end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) % + DASD_RAW_SECTORS_PER_TRACK; + basedev = block->base; + if ((start_padding_sectors || end_padding_sectors) && + (rq_data_dir(req) == WRITE)) { + DBF_DEV_EVENT(DBF_ERR, basedev, + "raw write not track aligned (%lu,%lu) req %p", + start_padding_sectors, end_padding_sectors, req); cqr = ERR_PTR(-EINVAL); goto out; } @@ -3258,7 +3268,6 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, DASD_RAW_SECTORS_PER_TRACK; trkcount = last_trk - first_trk + 1; first_offs = 0; - basedev = block->base; if (rq_data_dir(req) == READ) cmd = DASD_ECKD_CCW_READ_TRACK; @@ -3307,12 +3316,26 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, } idaws = (unsigned long *)(cqr->data + pfx_datasize); - len_to_track_end = 0; - + if (start_padding_sectors) { + ccw[-1].flags |= CCW_FLAG_CC; + ccw->cmd_code = cmd; + /* maximum 3390 track size */ + ccw->count = 57326; + /* 64k map to one track */ + len_to_track_end = 65536 - start_padding_sectors * 512; + ccw->cda = (__u32)(addr_t)idaws; + ccw->flags |= CCW_FLAG_IDA; + ccw->flags |= CCW_FLAG_SLI; + ccw++; + for (sectors = 0; sectors < start_padding_sectors; sectors += 8) + idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE); + } rq_for_each_segment(bv, req, iter) { dst = page_address(bv->bv_page) + bv->bv_offset; seg_len = bv->bv_len; + if (cmd == DASD_ECKD_CCW_READ_TRACK) + memset(dst, 0, seg_len); if (!len_to_track_end) { ccw[-1].flags |= CCW_FLAG_CC; ccw->cmd_code = cmd; @@ -3328,7 +3351,8 @@ static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev, len_to_track_end -= seg_len; idaws = idal_create_words(idaws, dst, seg_len); } - + for (sectors = 0; sectors < end_padding_sectors; sectors += 8) + idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE); if (blk_noretry_request(req) || block->base->features & DASD_FEATURE_FAILFAST) set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); @@ -4479,12 +4503,19 @@ dasd_eckd_init(void) kfree(dasd_reserve_req); return -ENOMEM; } + rawpadpage = (void *)__get_free_page(GFP_KERNEL); + if (!rawpadpage) { + kfree(path_verification_worker); + kfree(dasd_reserve_req); + return -ENOMEM; + } ret = ccw_driver_register(&dasd_eckd_driver); if (!ret) wait_for_device_probe(); else { kfree(path_verification_worker); kfree(dasd_reserve_req); + free_page((unsigned long)rawpadpage); } return ret; } @@ -4495,6 +4526,7 @@ dasd_eckd_cleanup(void) ccw_driver_unregister(&dasd_eckd_driver); kfree(path_verification_worker); kfree(dasd_reserve_req); + free_page((unsigned long)rawpadpage); } module_init(dasd_eckd_init); -- 2.39.5