fs/ext4/indirect.c

244  *	@partial: pointer to the last triple within a chain
252 				   Indirect *partial)
260 	goal = ext4_find_near(inode, partial);
316  *	we had read the existing part of chain and partial points to the last
538 	Indirect *partial;
554 	partial = ext4_get_branch(inode, depth, offsets, chain, &err);
557 	if (!partial) {
580 		 * Count number blocks in a subtree under 'partial'. At each
586 		for (i = partial - chain + 1; i < depth; i++)
620 	ar.goal = ext4_find_goal(inode, map->m_lblk, partial);
623 	indirect_blks = (chain + depth) - partial - 1;
629 	ar.len = ext4_blks_to_allocate(partial, indirect_blks,
636 				offsets + (partial - chain), partial);
646 		err = ext4_splice_branch(handle, &ar, partial, indirect_blks);
670 	partial = chain + depth - 1;	/* the whole chain */
672 	while (partial > chain) {
673 		BUFFER_TRACE(partial->bh, "call brelse");
674 		brelse(partial->bh);
675 		partial--;
770  *	ext4_find_shared - find the indirect blocks for partial truncation.
774  *	@chain:	  place to store the pointers to partial indirect blocks
808 	Indirect *partial, *p;
815 	partial = ext4_get_branch(inode, k, offsets, chain, &err);
817 	if (!partial)
818 		partial = chain + k-1;
823 	if (!partial->key && *partial->p)
826 	for (p = partial; (p > chain) && all_zeroes((__le32 *) p->bh->b_data, p->p); p--)
832 	 * it's easier to cheat and just decrement partial->p.
845 	while (partial > p) {
846 		brelse(partial->bh);
847 		partial--;
850 	return partial;
1126 	Indirect *partial;
1166 	partial = ext4_find_shared(inode, n, offsets, chain, &nr);
1169 		if (partial == chain) {
1172 					   &nr, &nr+1, (chain+n-1) - partial);
1173 			*partial->p = 0;
1180 			BUFFER_TRACE(partial->bh, "get_write_access");
1181 			ext4_free_branches(handle, inode, partial->bh,
1182 					partial->p,
1183 					partial->p+1, (chain+n-1) - partial);
1187 	while (partial > chain) {
1188 		ext4_free_branches(handle, inode, partial->bh, partial->p + 1,
1189 				   (__le32*)partial->bh->b_data+addr_per_block,
1190 				   (chain+n-1) - partial);
1191 		BUFFER_TRACE(partial->bh, "call brelse");
1192 		brelse(partial->bh);
1193 		partial--;
1242 	Indirect *partial, *partial2;
1269 		 * free partial block at start, and partial block at end of
1285 		partial = p = ext4_find_shared(inode, n, offsets, chain, &nr);
1287 			if (partial == chain) {
1290 					   &nr, &nr+1, (chain+n-1) - partial);
1291 				*partial->p = 0;
1294 				BUFFER_TRACE(partial->bh, "get_write_access");
1295 				ext4_free_branches(handle, inode, partial->bh,
1296 					partial->p,
1297 					partial->p+1, (chain+n-1) - partial);
1305 		while (partial > chain) {
1306 			ext4_free_branches(handle, inode, partial->bh,
1307 				partial->p + 1,
1308 				(__le32 *)partial->bh->b_data+addr_per_block,
1309 				(chain+n-1) - partial);
1310 			partial--;
1350 	partial = p = ext4_find_shared(inode, n, offsets, chain, &nr);
1355 		int level = min(partial - chain, partial2 - chain2);
1367 			if (partial == chain) {
1371 						   (chain+n-1) - partial);
1372 				*partial->p = 0;
1375 				BUFFER_TRACE(partial->bh, "get_write_access");
1376 				ext4_free_branches(handle, inode, partial->bh,
1377 						   partial->p,
1378 						   partial->p+1,
1379 						   (chain+n-1) - partial);
1394 	while (partial > chain || partial2 > chain2) {
1395 		int depth = (chain+n-1) - partial;
1398 		if (partial > chain && partial2 > chain2 &&
1399 		    partial->bh->b_blocknr == partial2->bh->b_blocknr) {
1404 			ext4_free_branches(handle, inode, partial->bh,
1405 					   partial->p + 1,
1407 					   (chain+n-1) - partial);
1412 		 * The start and end partial branches may not be at the same
1418 		if (partial > chain && depth <= depth2) {
1419 			ext4_free_branches(handle, inode, partial->bh,
1420 					   partial->p + 1,
1421 					   (__le32 *)partial->bh->b_data+addr_per_block,
1422 					   (chain+n-1) - partial);
1423 			partial--;