hfscommon/Catalog/FileIDsServices.c

47 static u_int32_t CheckExtents( void *extents, u_int32_t blocks, Boolean isHFSPlus );
55  * This function moves the overflow extents associated with srcID into the file associated with dstID.
56  * We should have already verified that 'srcID' has overflow extents. So now we move all of the overflow
64 	 * Only the source file should have extents, so we just track those.
77 			 * growing the extents b-tree.  Since the move is actually a copy + delete
127 		//--	Step 1: Check the catalog nodes for extents
129 		//--	locate the source file, test for extents in extent file, and copy the cat record for later
136 		//--	Check if there are any extents in the source file
137 		//��	I am only checling the extents in the low 32 bits, routine will fail if files extents after 2 gig are in overflow
138 		numSrcExtentBlocks = CheckExtents( srcData.hfsPlusFile.dataFork.extents, srcData.hfsPlusFile.dataFork.totalBlocks, isHFSPlus );
139 		if ( numSrcExtentBlocks == 0 )					//	then check the resource fork extents
140 			numSrcExtentBlocks = CheckExtents( srcData.hfsPlusFile.resourceFork.extents, srcData.hfsPlusFile.resourceFork.totalBlocks, isHFSPlus );
142 		//--	Check if there are any extents in the destination file
149 		numDestExtentBlocks = CheckExtents( destData.hfsPlusFile.dataFork.extents, destData.hfsPlusFile.dataFork.totalBlocks, isHFSPlus );
150 		if ( numDestExtentBlocks == 0 )					//	then check the resource fork extents
151 			numDestExtentBlocks = CheckExtents( destData.hfsPlusFile.resourceFork.extents, destData.hfsPlusFile.resourceFork.totalBlocks, isHFSPlus );
155 		//--	Exchange the extents key in the extent file
159 		if ( numSrcExtentBlocks && numDestExtentBlocks )	//	if both files have extents
161 			//--	Change the source extents file ids to our known bogus value
171 			//--	Change the destination extents file id's to the source id's
181                 err = MoveExtents( vcb, kHFSBogusExtentFileID, srcData.hfsPlusFile.fileID, 0, 0, isHFSPlus );	//	Move the extents back
187 			//--	Change the bogus extents file id's to the dest id's
197 				err = MoveExtents( vcb, srcData.hfsPlusFile.fileID, destData.hfsPlusFile.fileID, 0, 0, isHFSPlus );	//	Move the extents back
204 		else if ( numSrcExtentBlocks )	//	just the source file has extents
218 		else if ( numDestExtentBlocks )	//	just the destination file has extents
257 		//--	Step 1: Check the catalog nodes for extents
259 		//--	locate the source file, test for extents in extent file, and copy the cat record for later
266 		//--	Check if there are any extents in the source file
268 		if ( numSrcExtentBlocks == 0 )					//	then check the resource fork extents
275 		//--	Check if there are any extents in the destination file
283 		if ( numDestExtentBlocks == 0 )					//	then check the resource fork extents
291 		//--	Exchange the extents key in the extent file
295 		if ( numSrcExtentBlocks && numDestExtentBlocks )	//	if both files have extents
297 			//--	Change the source extents file ids to our known bogus value
312 			//--	Change the destination extents file id's to the source id's
322                 err = MoveExtents( vcb, kHFSBogusExtentFileID, srcData.hfsFile.fileID, 0, 0, isHFSPlus );	//	Move the extents back
328 			//--	Change the bogus extents file id's to the dest id's
338 				err = MoveExtents( vcb, srcData.hfsFile.fileID, destData.hfsFile.fileID, 0, 0, isHFSPlus );	//	Move the extents back
345 		else if ( numSrcExtentBlocks )	//	just the source file has extents
359 		else if ( numDestExtentBlocks )	//	just the destination file has extents
540 			if ( err == btNotFound )		//	Did we run out of extent records in the extents tree?
628 //--	Delete all extents in extent file that have the ID given.
731 //	Check if there are extents represented in the extents overflow file.
732 static u_int32_t  CheckExtents( void *extents, u_int32_t totalBlocks, Boolean isHFSPlus )
747 			extentAllocationBlocks += ((HFSPlusExtentDescriptor *)extents)[i].blockCount;
748 			if ( extentAllocationBlocks >= totalBlocks )		//	greater than or equal (extents can add past eof if 'Close" crashes w/o truncating new clump)
756 			extentAllocationBlocks += ((HFSExtentDescriptor *)extents)[i].blockCount;
757 			if ( extentAllocationBlocks >= totalBlocks )		//	greater than or equal (extents can add past eof if 'Close" crashes w/o truncating new clump)