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disk: Set volume label also on BPB update #231

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Merged
PerditionC merged 1 commit into from
Dec 9, 2025
Merged

disk: Set volume label also on BPB update #231

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18 changes: 12 additions & 6 deletions kernel/dsk.c
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Original file line number Diff line number Diff line change
Expand Up @@ -709,25 +709,31 @@ STATIC WORD Genblkdev(rqptr rp, ddt * pddt)
{
struct Gioc_media FAR *gioc = rp->r_gioc;
struct FS_info *fs;
BYTE extended_BPB_signature;

ret = getbpb(pddt);
if (ret != 0)
return (ret);

extended_BPB_signature =
DiskTransferBuffer[(pddt->ddt_bpb.bpb_nfsect != 0 ? 0x26 : 0x42)];
/* return error if media lacks extended BPB with serial # */
{
register BYTE extended_BPB_signature =
DiskTransferBuffer[(pddt->ddt_bpb.bpb_nfsect != 0 ? 0x26 : 0x42)];
if ((extended_BPB_signature != 0x29) || (extended_BPB_signature != 0x28))
return failure(E_MEDIA);
}
if ((extended_BPB_signature != 0x29) && (extended_BPB_signature != 0x28))
return failure(E_MEDIA);

/* otherwise, store serial # in extended BPB */
fs = (struct FS_info *)&DiskTransferBuffer
[(pddt->ddt_bpb.bpb_nfsect != 0 ? 0x27 : 0x43)];
fs->serialno = gioc->ioc_serialno;
pddt->ddt_serialno = fs->serialno;

/* And volume name if BPB supports it */
if (extended_BPB_signature == 0x29)
{
fmemcpy(fs->volume, gioc->ioc_volume, 11);
fmemcpy(pddt->ddt_volume, fs->volume, 11);
}

ret = RWzero(pddt, LBA_WRITE);
if (ret != 0)
return (dskerr(ret));
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