// Sets 'blockpos' to point to the next block segment for the inode (and moves onto the
// next block descriptor inode if necessary)
int pfsBlockSeekNextSegment(pfs_cache_t *clink, pfs_blockpos_t *blockpos)
{
pfs_cache_t *nextSegment;
int result=0;
if (blockpos->byte_offset)
{
PFS_PRINTF(PFS_DRV_NAME": Panic: This is a bug!\n");
return -1;
}
// If we're at the end of the block descriptor array for the current
// inode, then move onto the next inode
if (pfsFixIndex(blockpos->block_segment+1)==0)
{
if ((nextSegment=pfsBlockGetNextSegment(pfsCacheUsedAdd(blockpos->inode), &result)) == NULL)
return result;
pfsCacheFree(blockpos->inode);
blockpos->inode=nextSegment;
if (clink->u.inode->number_data-1 == ++blockpos->block_segment)
return -EINVAL;
}
blockpos->block_offset=0;
blockpos->block_segment++;
return result;
}
int pfsInodeSync(pfs_blockpos_t *blockpos, u64 size, u32 used_segments)
{
int result=0;
u32 i;
u16 count;
for(i=pfsBlockSyncPos(blockpos, size); i; )
{
count=blockpos->inode->u.inode->data[pfsFixIndex(blockpos->block_segment)].count;
i+=blockpos->block_offset;
if (i < count){
blockpos->block_offset=i;
break;
}
i-=count;
if (blockpos->block_segment + 1 == used_segments)
{
blockpos->block_offset=count;
if (i || blockpos->byte_offset){
PFS_PRINTF(PFS_DRV_NAME": panic: fp exceeds file.\n");
return -EINVAL;
}
}else{
blockpos->block_offset=0;
blockpos->block_segment++;
}
if (pfsFixIndex(blockpos->block_segment))
continue;
if ((blockpos->inode = pfsBlockGetNextSegment(blockpos->inode, &result)) == 0)
break;
i++;
}
return result;
}
pfs_cache_t *pfsGetDentriesChunk(pfs_blockpos_t *position, int *result)
{
pfs_blockinfo_t *bi;
pfs_mount_t *pfsMount=position->inode->pfsMount;
bi = &position->inode->u.inode->data[pfsFixIndex(position->block_segment)];
return pfsCacheGetData(pfsMount, bi->subpart,
((bi->number + position->block_offset) << pfsMount->inode_scale) +
position->byte_offset / pfsMetaSize, PFS_CACHE_FLAG_NOTHING, result);
}
// Attempt to expand the block segment 'blockpos' by 'count' blocks
int pfsBlockExpandSegment(pfs_cache_t *clink, pfs_blockpos_t *blockpos, u32 count)
{
int ret;
pfs_blockinfo_t *bi;
if(pfsFixIndex(blockpos->block_segment)==0)
return 0;
bi = &blockpos->inode->u.inode->data[pfsFixIndex(blockpos->block_segment)];
if ((ret = pfsBitmapAllocateAdditionalZones(clink->pfsMount, bi, count)))
{
bi->count+=ret;
clink->u.inode->number_blocks+=ret;
blockpos->inode->flags |= PFS_CACHE_FLAG_DIRTY;
clink->flags |= PFS_CACHE_FLAG_DIRTY;
}
return ret;
}
// Attempts to allocate 'blocks' new blocks for an inode
int pfsBlockAllocNewSegment(pfs_cache_t *clink, pfs_blockpos_t *blockpos, u32 blocks)
{
pfs_blockinfo_t bi, *bi2;
int result=0;
pfs_mount_t *pfsMount=clink->pfsMount;
u32 i, old_blocks = blocks;
if (pfsCacheIsFull())
return -ENOMEM;
// create "indirect segment descriptor" if necessary
if (pfsFixIndex(clink->u.inode->number_data) == 0)
{
pfs_cache_t *clink2;
bi2 = &blockpos->inode->u.inode->data[pfsFixIndex(blockpos->block_segment)];
bi.subpart=bi2->subpart;
bi.count=1;
bi.number=bi2->number+bi2->count;
result=pfsBitmapSearchFreeZone(pfsMount, &bi, clink->u.inode->number_blocks);
if (result<0)
{
PFS_PRINTF(PFS_DRV_NAME": Error: Couldnt allocate zone! (1)\n");
return result;
}
clink2=pfsCacheGetData(pfsMount, bi.subpart, bi.number << pfsMount->inode_scale,
PFS_CACHE_FLAG_SEGI | PFS_CACHE_FLAG_NOLOAD, &result);
memset(clink2->u.inode, 0, sizeof(pfs_inode_t));
clink2->u.inode->magic=PFS_SEGI_MAGIC;
memcpy(&clink2->u.inode->inode_block, &clink->u.inode->inode_block, sizeof(pfs_blockinfo_t));
memcpy(&clink2->u.inode->last_segment, blockpos->inode->u.inode->data, sizeof(pfs_blockinfo_t));
memcpy(clink2->u.inode->data, &bi, sizeof(pfs_blockinfo_t));
clink2->flags |= PFS_CACHE_FLAG_DIRTY;
clink->u.inode->number_blocks+=bi.count;
clink->u.inode->number_data++;
memcpy(&clink->u.inode->last_segment, &bi, sizeof(pfs_blockinfo_t));
clink->u.inode->number_segdesg++;
clink->flags |= PFS_CACHE_FLAG_DIRTY;
blockpos->block_segment++;
blockpos->block_offset=0;
memcpy(&blockpos->inode->u.inode->next_segment, &bi, sizeof(pfs_blockinfo_t));
blockpos->inode->flags |= PFS_CACHE_FLAG_DIRTY;
pfsCacheFree(blockpos->inode);
blockpos->inode=clink2;
}
bi2 = &blockpos->inode->u.inode->data[pfsFixIndex(blockpos->block_segment)];
bi.subpart = bi2->subpart;
bi.count = blocks;
bi.number = bi2->number + bi2->count;
result = pfsBitmapSearchFreeZone(pfsMount, &bi, clink->u.inode->number_blocks);
if(result < 0)
{
PFS_PRINTF(PFS_DRV_NAME": Error: Couldnt allocate zone! (2)\n");
return result;
}
clink->u.inode->number_blocks += bi.count;
clink->u.inode->number_data++;
clink->flags |= PFS_CACHE_FLAG_DIRTY;
blockpos->block_offset=0;
blockpos->block_segment++;
i = pfsFixIndex(clink->u.inode->number_data-1);
memcpy(&blockpos->inode->u.inode->data[i], &bi, sizeof(pfs_blockinfo_t));
blockpos->inode->flags |= PFS_CACHE_FLAG_DIRTY;
blocks -= bi.count;
if (blocks)
blocks -= pfsBlockExpandSegment(clink, blockpos, blocks);
return old_blocks - blocks;
}
// Returns the block info for the block segment corresponding to the
// files current position.
pfs_blockinfo_t* pfsBlockGetCurrent(pfs_blockpos_t *blockpos)
{
return &blockpos->inode->u.inode->data[pfsFixIndex(blockpos->block_segment)];
}
