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https://github.com/versity/scoutfs.git
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e19716a0f2
The code that works with the super block had drifted a bit. We still had two from an old design and we weren't doing anything with its crc. Move to only using one super block at a fixed blkno and store and verify its crc field by sharing code with the btree block checksumming. Signed-off-by: Zach Brown <zab@versity.com>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/*
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* Copyright (C) 2018 Versity Software, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/crc32c.h>
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#include "format.h"
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#include "super.h"
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#include "block.h"
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__le32 scoutfs_block_calc_crc(struct scoutfs_block_header *hdr)
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{
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int off = offsetof(struct scoutfs_block_header, crc) +
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FIELD_SIZEOF(struct scoutfs_block_header, crc);
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u32 calc = crc32c(~0, (char *)hdr + off, SCOUTFS_BLOCK_SIZE - off);
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return cpu_to_le32(calc);
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}
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bool scoutfs_block_valid_crc(struct scoutfs_block_header *hdr)
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{
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return hdr->crc == scoutfs_block_calc_crc(hdr);
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}
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bool scoutfs_block_valid_ref(struct super_block *sb,
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struct scoutfs_block_header *hdr,
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__le64 seq, __le64 blkno)
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{
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struct scoutfs_super_block *super = &SCOUTFS_SB(sb)->super;
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return hdr->fsid == super->hdr.fsid && hdr->seq == seq &&
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hdr->blkno == blkno;
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}
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