dm.c (942baad211336efefb93a8369478888ab845c450) dm.c (6842d264aa5205da338b6dcc6acfa2a6732558f1)
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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1232 out:
1233 dm_put_live_table(md, srcu_idx);
1234
1235 return ret;
1236}
1237
1238/*
1239 * A target may call dm_accept_partial_bio only from the map routine. It is
1/*
2 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#include "dm-core.h"

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1232 out:
1233 dm_put_live_table(md, srcu_idx);
1234
1235 return ret;
1236}
1237
1238/*
1239 * A target may call dm_accept_partial_bio only from the map routine. It is
1240 * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_RESET,
1241 * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH.
1240 * allowed for all bio types except REQ_PREFLUSH, REQ_OP_ZONE_* zone management
1241 * operations and REQ_OP_ZONE_APPEND (zone append writes).
1242 *
1243 * dm_accept_partial_bio informs the dm that the target only wants to process
1244 * additional n_sectors sectors of the bio and the rest of the data should be
1245 * sent in a next bio.
1246 *
1247 * A diagram that explains the arithmetics:
1248 * +--------------------+---------------+-------+
1249 * | 1 | 2 | 3 |

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1263 * If the target wants to receive multiple copies of the bio (via num_*bios, etc),
1264 * the partially processed part (the sum of regions 1+2) must be the same for all
1265 * copies of the bio.
1266 */
1267void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
1268{
1269 struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
1270 unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT;
1242 *
1243 * dm_accept_partial_bio informs the dm that the target only wants to process
1244 * additional n_sectors sectors of the bio and the rest of the data should be
1245 * sent in a next bio.
1246 *
1247 * A diagram that explains the arithmetics:
1248 * +--------------------+---------------+-------+
1249 * | 1 | 2 | 3 |

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1263 * If the target wants to receive multiple copies of the bio (via num_*bios, etc),
1264 * the partially processed part (the sum of regions 1+2) must be the same for all
1265 * copies of the bio.
1266 */
1267void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
1268{
1269 struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
1270 unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT;
1271
1271 BUG_ON(bio->bi_opf & REQ_PREFLUSH);
1272 BUG_ON(bio->bi_opf & REQ_PREFLUSH);
1273 BUG_ON(op_is_zone_mgmt(bio_op(bio)));
1274 BUG_ON(bio_op(bio) == REQ_OP_ZONE_APPEND);
1272 BUG_ON(bi_size > *tio->len_ptr);
1273 BUG_ON(n_sectors > bi_size);
1275 BUG_ON(bi_size > *tio->len_ptr);
1276 BUG_ON(n_sectors > bi_size);
1277
1274 *tio->len_ptr -= bi_size - n_sectors;
1275 bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
1276}
1277EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
1278
1279static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch)
1280{
1281 mutex_lock(&md->swap_bios_lock);

--- 1899 unchanged lines hidden --- 		1278 *tio->len_ptr -= bi_size - n_sectors;
1279 bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
1280}
1281EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
1282
1283static noinline void __set_swap_bios_limit(struct mapped_device *md, int latch)
1284{
1285 mutex_lock(&md->swap_bios_lock);

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