hfscommon/Misc/FileExtentMapping.c

84 					Deallocate all allocation blocks in all extents of an extent
87 					Deallocate blocks and delete extent records for all allocation
88 					blocks beyond a certain point in a file.  The starting point
92 					Deallocate all allocation blocks belonging to a given fork.
596 		// Loop over the extent record and release the blocks associated with each extent.
622 //				allocation blocks represented by the extents are deallocated.
993 	//	Determine how many blocks need to be allocated.
1000 	 * For deferred allocations just reserve the blocks.
1019 	 * Give back any unallocated blocks before doing real allocations.
1065 	//	enough free blocks on the volume (quick test).
1074 	//	See if there are already enough blocks allocated to the file.
1079 		//	Enough blocks are already allocated.  Just update the FCB to reflect the new length.
1114 	 * contiguity as it can result in fewer blocks being needed from the underlying
1163 		/* Find number of free blocks based on reserved block flag option */
1210 				//	We grew the file's last extent, so just adjust the number of blocks.
1351 	u_int32_t			physNumBlocks;	//	Number of allocation blocks in file (according to PEOF)
1388 	nextBlock = howmany(peof, vcb->blockSize);	// number of allocation blocks to remain in file
1389 	peof = (int64_t)((int64_t)nextBlock * (int64_t)vcb->blockSize);					// number of bytes in those blocks
1444 	//	keep up through peof).  The search will tell us how many allocation blocks exist
1457 		numBlocks = extentNextBlock - nextBlock;	//	How many blocks in this extent to free up
1461 			//	Free the blocks in bitmap
1509 	//	If there are any following allocation blocks, then we need
1511 	//	blocks.
2049 	u_int32_t	blocks;
2057 		blocks = extentRecord[extentIndex].blockCount;
2059 		if ( blocks == 0 )
2065 		*blocksChecked += blocks;
2067 		if (blocks & mask)