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28521e8c45
Add a trivial helper function which verifies the block header in metadata blocks. Signed-off-by: Zach Brown <zab@versity.com>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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* Copyright (C) 2015 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/buffer_head.h>
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#include "super.h"
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#include "format.h"
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#include "block.h"
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#include "crc.h"
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#define BH_Private_Verified BH_PrivateStart
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BUFFER_FNS(Private_Verified, private_verified)
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/*
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* A quick metadata read wrapper which knows how to validate the
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* block header.
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*/
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struct buffer_head *scoutfs_read_block(struct super_block *sb, u64 blkno)
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{
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struct scoutfs_sb_info *sbi = SCOUTFS_SB(sb);
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struct scoutfs_super_block *super = &sbi->super;
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struct scoutfs_block_header *hdr;
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struct buffer_head *bh;
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u32 crc;
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bh = sb_bread(sb, blkno);
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if (!bh || buffer_private_verified(bh))
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return bh;
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hdr = (void *)bh->b_data;
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crc = scoutfs_crc_block(hdr);
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if (le32_to_cpu(hdr->crc) != crc) {
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printk("blkno %llu hdr crc %x != calculated %x\n", blkno,
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le32_to_cpu(hdr->crc), crc);
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} else if (super->hdr.fsid && hdr->fsid != super->hdr.fsid) {
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printk("blkno %llu fsid %llx != super fsid %llx\n", blkno,
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le64_to_cpu(hdr->fsid), le64_to_cpu(super->hdr.fsid));
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} else if (le64_to_cpu(hdr->blkno) != blkno) {
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printk("blkno %llu invalid hdr blkno %llx\n", blkno,
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le64_to_cpu(hdr->blkno));
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} else {
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set_buffer_private_verified(bh);
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return bh;
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}
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brelse(bh);
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return NULL;
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}
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