btt_devs.c (527c465a3c8716d93201ae34b7fc52679610596d) btt_devs.c (ab45e7632717b811e0786e46ca5ad279cb731b66)
1/*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but

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337{
338 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
339
340 if (dev)
341 __nd_device_register(dev);
342 return dev;
343}
344
1/*
2 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but

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337{
338 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
339
340 if (dev)
341 __nd_device_register(dev);
342 return dev;
343}
344
345/**
346 * nd_btt_arena_is_valid - check if the metadata layout is valid
347 * @nd_btt: device with BTT geometry and backing device info
348 * @super: pointer to the arena's info block being tested
349 *
350 * Check consistency of the btt info block with itself by validating
351 * the checksum.
352 *
353 * Returns:
354 * false for an invalid info block, true for a valid one
355 */
356bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
357{
358 u64 checksum;
359
360 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
361 return false;
362
363 checksum = le64_to_cpu(super->checksum);
364 super->checksum = 0;
365 if (checksum != nd_btt_sb_checksum(super))
366 return false;
367 super->checksum = cpu_to_le64(checksum);
368
369 /* TODO: figure out action for this */
370 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
371 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
372
373 return true;
374}
375EXPORT_SYMBOL(nd_btt_arena_is_valid);
376
345/*
346 * nd_btt_sb_checksum: compute checksum for btt info block
347 *
348 * Returns a fletcher64 checksum of everything in the given info block
349 * except the last field (since that's where the checksum lives).
350 */
351u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
352{

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359 btt_sb->checksum = sum_save;
360 return sum;
361}
362EXPORT_SYMBOL(nd_btt_sb_checksum);
363
364static int __nd_btt_probe(struct nd_btt *nd_btt,
365 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
366{
377/*
378 * nd_btt_sb_checksum: compute checksum for btt info block
379 *
380 * Returns a fletcher64 checksum of everything in the given info block
381 * except the last field (since that's where the checksum lives).
382 */
383u64 nd_btt_sb_checksum(struct btt_sb *btt_sb)
384{

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391 btt_sb->checksum = sum_save;
392 return sum;
393}
394EXPORT_SYMBOL(nd_btt_sb_checksum);
395
396static int __nd_btt_probe(struct nd_btt *nd_btt,
397 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
398{
367 u64 checksum;
368
369 if (!btt_sb || !ndns || !nd_btt)
370 return -ENODEV;
371
372 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb)))
373 return -ENXIO;
374
375 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
376 return -ENXIO;
377
399 if (!btt_sb || !ndns || !nd_btt)
400 return -ENODEV;
401
402 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb)))
403 return -ENXIO;
404
405 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
406 return -ENXIO;
407
378 if (memcmp(btt_sb->signature, BTT_SIG, BTT_SIG_LEN) != 0)
408 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
379 return -ENODEV;
380
409 return -ENODEV;
410
381 checksum = le64_to_cpu(btt_sb->checksum);
382 btt_sb->checksum = 0;
383 if (checksum != nd_btt_sb_checksum(btt_sb))
384 return -ENODEV;
385 btt_sb->checksum = cpu_to_le64(checksum);
386
387 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
388 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
389 if (!nd_btt->uuid)
390 return -ENOMEM;
391
392 __nd_device_register(&nd_btt->dev);
393
394 return 0;

--- 31 unchanged lines hidden --- 		411 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
412 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
413 if (!nd_btt->uuid)
414 return -ENOMEM;
415
416 __nd_device_register(&nd_btt->dev);
417
418 return 0;

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