bsd/hfs/hfs_xattr.c

96 static int  read_attr_data(struct hfsmount *hfsmp, uio_t uio, size_t datasize, HFSPlusExtentDescriptor *extents);
98 static int  write_attr_data(struct hfsmount *hfsmp, uio_t uio, size_t datasize, HFSPlusExtentDescriptor *extents);
100 static int  alloc_attr_blks(struct hfsmount *hfsmp, size_t attrsize, size_t extentbufsize, HFSPlusExtentDescriptor *extents, int *blocks);
102 static void  free_attr_blks(struct hfsmount *hfsmp, int blkcnt, HFSPlusExtentDescriptor *extents);
106 static int  count_extent_blocks(int maxblks, HFSPlusExtentRecord extents);
426  * overflow extents file to find non-resource, non-finderinfo EAs.  There may be cases
555 			/* Process overflow extents if necessary. */
572 				/* Get a buffer to hold the worst case amount of extents. */
583 				/* Grab the first 8 extents. */
584 				bcopy(&recp->forkData.theFork.extents[0], extentptr, sizeof(HFSPlusExtentRecord));
586 				blkcnt = count_extent_blocks(totalblocks, recp->forkData.theFork.extents);
588 				/* Now lookup the overflow extents. */
596 						printf("hfs_getxattr: %s missing extents, only %d blks of %d found\n",
601 					/* Grab the next 8 extents. */
602 					bcopy(&recp->overflowExtents.extents[0], extentptr, sizeof(HFSPlusExtentRecord));
604 					blkcnt += count_extent_blocks(totalblocks, recp->overflowExtents.extents);
619 			else /* No overflow extents. */ {
620 				result = read_attr_data(hfsmp, uio, recp->forkData.theFork.logicalSize, recp->forkData.theFork.extents);
1114 		bcopy(extentptr, recp->forkData.theFork.extents, sizeof(HFSPlusExtentRecord));
1124 		extentblks = count_extent_blocks(blkcnt, recp->forkData.theFork.extents);
1129 		/* Create overflow extents as needed. */
1137 			/* Copy the next set of extents. */
1139 			bcopy(&extentptr[i], recp->overflowExtents.extents, sizeof(HFSPlusExtentRecord));
1147 			extentblks = count_extent_blocks(blkcnt, recp->overflowExtents.extents);
1586 		/* Process the first 8 extents. */
1587 		extentblks = count_extent_blocks(totalblks, attrdata.forkData.theFork.extents);
1591 			free_attr_blks(hfsmp, extentblks, attrdata.forkData.theFork.extents);
1596 		/* Process any overflow extents. */
1609 			/* Process the next 8 extents. */
1610 			extentblks = count_extent_blocks(totalblks, attrdata.overflowExtents.extents);
1614 				free_attr_blks(hfsmp, extentblks, attrdata.overflowExtents.extents);
2278 read_attr_data(struct hfsmount *hfsmp, uio_t uio, size_t datasize, HFSPlusExtentDescriptor *extents)
2298 	for (i = 0; (attrsize > 0) && (bufsize > 0) && (extents[i].startBlock != 0); ++i) {
2299 		iosize = (int)extents[i].blockCount * blksize;
2303 		uio_setoffset(uio, (u_int64_t)extents[i].startBlock * (u_int64_t)blksize);
2309 			iosize, extents[i].startBlock, extents[i].blockCount, result);
2327 write_attr_data(struct hfsmount *hfsmp, uio_t uio, size_t datasize, HFSPlusExtentDescriptor *extents)
2348 	for (i = 0; (attrsize > 0) && (bufsize > 0) && (extents[i].startBlock != 0); ++i) {
2349 		iosize = (int)extents[i].blockCount * blksize;
2353 		uio_setoffset(uio, (u_int64_t)extents[i].startBlock * (u_int64_t)blksize);
2359 			iosize, extents[i].startBlock, extents[i].blockCount, result);
2377 alloc_attr_blks(struct hfsmount *hfsmp, size_t attrsize, size_t extentbufsize, HFSPlusExtentDescriptor *extents, int *blocks)
2398 				       &extents[i].startBlock, &extents[i].blockCount);
2401 			blkcnt, extents[i].startBlock, extents[i].blockCount, result);
2404 			extents[i].startBlock = 0;
2405 			extents[i].blockCount = 0;
2408 		blkcnt -= extents[i].blockCount;
2409 		startblk = extents[i].startBlock + extents[i].blockCount;
2412 	 * If it didn't fit in the extents buffer then bail.
2421 			if ((blkcnt = extents[i].blockCount) != 0) {
2422 				(void) BlockDeallocate(hfsmp, extents[i].startBlock, blkcnt, 0);
2423 				extents[i].startBlock = 0;
2424 				extents[i].blockCount = 0;
2437 free_attr_blks(struct hfsmount *hfsmp, int blkcnt, HFSPlusExtentDescriptor *extents)
2446 	for (i = 0; (remblks > 0) && (extents[i].blockCount != 0); i++) {
2447 		if (extents[i].blockCount > (u_int32_t)blkcnt) {
2450 				extents[i].startBlock, extents[i].blockCount);
2452 			extents[i].blockCount = 0;
2455 		if (extents[i].startBlock == 0) {
2458 		(void)BlockDeallocate(hfsmp, extents[i].startBlock, extents[i].blockCount, 0);
2459 		remblks -= extents[i].blockCount;
2460 		extents[i].startBlock = 0;
2461 		extents[i].blockCount = 0;
2465 		       extents[i].startBlock, extents[i].blockCount);
2471 			start = (u_int64_t)extents[i].startBlock * (u_int64_t)hfsmp->blockSize;
2472 			end = start + (u_int64_t)extents[i].blockCount * (u_int64_t)hfsmp->blockSize;
2485 	if (forkdata->extents[7].blockCount == 0)
2488 	blocks = forkdata->extents[0].blockCount +
2489 		 forkdata->extents[1].blockCount +
2490 		 forkdata->extents[2].blockCount +
2491 		 forkdata->extents[3].blockCount +
2492 		 forkdata->extents[4].blockCount +
2493 		 forkdata->extents[5].blockCount +
2494 		 forkdata->extents[6].blockCount +
2495 		 forkdata->extents[7].blockCount;
2501 count_extent_blocks(int maxblks, HFSPlusExtentRecord extents)
2507 		/* Ignore obvious bogus extents. */
2508 		if (extents[i].blockCount > (u_int32_t)maxblks)
2510 		if (extents[i].startBlock == 0 || extents[i].blockCount == 0)
2512 		blocks += extents[i].blockCount;