/*
* NAME: file->alloc()
* DESCRIPTION: reserve allocation blocks for a file
*/
long f_alloc(hfsfile *file)
{
hfsvol *vol = file->vol;
unsigned long clumpsz;
ExtDescriptor blocks;
clumpsz = file->cat.u.fil.filClpSize;
if (clumpsz == 0)
{
if (file == &vol->ext.f)
clumpsz = vol->mdb.drXTClpSiz;
else if (file == &vol->cat.f)
clumpsz = vol->mdb.drCTClpSiz;
else
clumpsz = vol->mdb.drClpSiz;
}
blocks.xdrNumABlks = clumpsz / vol->mdb.drAlBlkSiz;
if (v_allocblocks(vol, &blocks) == -1)
goto fail;
if (f_addextent(file, &blocks) == -1)
{
v_freeblocks(vol, &blocks);
goto fail;
}
return blocks.xdrNumABlks;
fail:
return -1;
}
/*
* NAME: file->alloc()
* DESCRIPTION: reserve disk blocks for a file
*/
int f_alloc(hfsfile *file)
{
hfsvol *vol = file->vol;
ExtDescriptor blocks;
ExtDataRec *extrec;
unsigned long *pylen, clumpsz;
unsigned int start, end;
node n;
int i;
clumpsz = file->clump;
if (clumpsz == 0)
clumpsz = vol->mdb.drClpSiz;
blocks.xdrNumABlks = clumpsz / vol->mdb.drAlBlkSiz;
if (v_allocblocks(vol, &blocks) < 0)
return -1;
/* update the file's extents */
f_getptrs(file, 0, &pylen, &extrec);
start = file->fabn;
end = *pylen / vol->mdb.drAlBlkSiz;
n.nnum = 0;
i = -1;
while (start < end)
{
for (i = 0; i < 3; ++i)
{
unsigned int num;
num = file->ext[i].xdrNumABlks;
start += num;
if (start == end)
break;
else if (start > end)
{
v_freeblocks(vol, &blocks);
ERROR(EIO, "file extents exceed file physical length");
return -1;
}
else if (num == 0)
{
v_freeblocks(vol, &blocks);
ERROR(EIO, "empty file extent");
return -1;
}
}
if (start == end)
break;
if (v_extsearch(file, start, &file->ext, &n) <= 0)
{
v_freeblocks(vol, &blocks);
return -1;
}
file->fabn = start;
}
if (i >= 0 &&
file->ext[i].xdrStABN + file->ext[i].xdrNumABlks == blocks.xdrStABN)
file->ext[i].xdrNumABlks += blocks.xdrNumABlks;
else
{
/* create a new extent descriptor */
if (++i < 3)
file->ext[i] = blocks;
else
{
ExtKeyRec key;
unsigned char record[HFS_EXTRECMAXLEN];
int reclen;
/* record is full; create a new one */
file->ext[0] = blocks;
for (i = 1; i < 3; ++i)
{
file->ext[i].xdrStABN = 0;
file->ext[i].xdrNumABlks = 0;
}
file->fabn = start;
r_makeextkey(&key, file->fork, file->cat.u.fil.filFlNum, end);
r_packextkey(&key, record, &reclen);
r_packextdata(&file->ext, HFS_RECDATA(record), &reclen);
if (bt_insert(&vol->ext, record, reclen) < 0)
{
v_freeblocks(vol, &blocks);
return -1;
}
i = -1;
}
}
if (i >= 0)
{
/* store the modified extent record */
if (file->fabn)
{
if ((n.nnum == 0 &&
v_extsearch(file, file->fabn, 0, &n) <= 0) ||
v_putextrec(&file->ext, &n) < 0)
{
v_freeblocks(vol, &blocks);
return -1;
}
}
else
memcpy(extrec, file->ext, sizeof(ExtDataRec));
}
*pylen += blocks.xdrNumABlks * vol->mdb.drAlBlkSiz;
file->flags |= HFS_UPDATE_CATREC;
return blocks.xdrNumABlks;
}
