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Ernesto A. Fernández
cb5f6058eb
As explained in the previous patch for the fsck, filesystems within a certain size range require more than one block to fit the spaceman. Implement this in the mkfs. Signed-off-by: Ernesto A. Fernández <ernesto@corellium.com>
35 lines
996 B
C
35 lines
996 B
C
/*
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* Copyright (C) 2019 Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
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*/
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <apfs/checksum.h>
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#include <apfs/raw.h>
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#include "mkapfs.h"
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#include "object.h"
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/**
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* set_object_header - Set the header for a filesystem object
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* @obj: pointer to the on-disk object header
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* @size: size of the object (in bytes)
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* @oid: object id
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* @type: object type
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* @subtype: object subtype
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*
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* All other fields of the object headed by @obj must be set in advance by
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* the caller, otherwise the checksum won't be correct.
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*/
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void set_object_header(struct apfs_obj_phys *obj, u32 size, u64 oid, u32 type, u32 subtype)
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{
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char *after_cksum = (char *)obj + APFS_MAX_CKSUM_SIZE;
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int after_cksum_len = size - APFS_MAX_CKSUM_SIZE;
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obj->o_oid = cpu_to_le64(oid);
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obj->o_xid = cpu_to_le64(MKFS_XID);
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obj->o_type = cpu_to_le32(type);
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obj->o_subtype = cpu_to_le32(subtype);
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obj->o_cksum = cpu_to_le64(fletcher64(after_cksum, after_cksum_len));
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}
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