From: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Date: Tue, 6 Sep 2016 02:36:54 +0000 (+0200)
Subject: ext4: remove duplicated block release code for extents
X-Git-Tag: v2016.11-rc1~82
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=b779e0290a4a6ac589bfac7192b4f8e677d3bf8a;p=oweals%2Fu-boot.git

ext4: remove duplicated block release code for extents

The data blocks are identical for files using traditional direct/indirect
block allocation scheme and extent trees, thus this code part can be
common. Only the code to deallocate the indirect blocks to record the
used blocks has to be seperate, respectively the code to release extent
tree index blocks.

Actually the code to release the extent tree index blocks is still missing,
but at least add a FIXME at the appropriate place.

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
---

diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c
index ba7ac753b5..913c46e89f 100644
--- a/fs/ext4/ext4_write.c
+++ b/fs/ext4/ext4_write.c
@@ -447,92 +447,48 @@ static int ext4fs_delete_file(int inodeno)
 		no_blocks++;
 
 	if (le32_to_cpu(inode.flags) & EXT4_EXTENTS_FL) {
-		struct ext2fs_node *node_inode =
-		    zalloc(sizeof(struct ext2fs_node));
-		if (!node_inode)
-			goto fail;
-		node_inode->data = ext4fs_root;
-		node_inode->ino = inodeno;
-		node_inode->inode_read = 0;
-		memcpy(&(node_inode->inode), &inode, sizeof(struct ext2_inode));
-
-		for (i = 0; i < no_blocks; i++) {
-			blknr = read_allocated_block(&(node_inode->inode), i);
-			bg_idx = blknr / blk_per_grp;
-			if (fs->blksz == 1024) {
-				remainder = blknr % blk_per_grp;
-				if (!remainder)
-					bg_idx--;
-			}
-			ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
-						bg_idx);
-			debug("EXT4_EXTENTS Block releasing %ld: %d\n",
-			      blknr, bg_idx);
-
-			ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
-			ext4fs_sb_free_blocks_inc(fs->sb);
-
-			/* journal backup */
-			if (prev_bg_bmap_idx != bg_idx) {
-				status =
-				    ext4fs_devread(
-						   (lbaint_t)le32_to_cpu(bgd[bg_idx].block_id) *
-						   fs->sect_perblk, 0,
-						   fs->blksz, journal_buffer);
-				if (status == 0)
-					goto fail;
-				if (ext4fs_log_journal(journal_buffer,
-							le32_to_cpu(bgd[bg_idx].block_id)))
-					goto fail;
-				prev_bg_bmap_idx = bg_idx;
-			}
-		}
-		if (node_inode) {
-			free(node_inode);
-			node_inode = NULL;
-		}
+		/* FIXME delete extent index blocks, i.e. eh_depth >= 1 */
+		struct ext4_extent_header *eh =
+			(struct ext4_extent_header *)
+				inode.b.blocks.dir_blocks;
+		debug("del: dep=%d entries=%d\n", eh->eh_depth, eh->eh_entries);
 	} else {
-
 		delete_single_indirect_block(&inode);
 		delete_double_indirect_block(&inode);
 		delete_triple_indirect_block(&inode);
+	}
 
-		/* read the block no allocated to a file */
-		no_blocks = le32_to_cpu(inode.size) / fs->blksz;
-		if (le32_to_cpu(inode.size) % fs->blksz)
-			no_blocks++;
-		for (i = 0; i < no_blocks; i++) {
-			blknr = read_allocated_block(&inode, i);
-			bg_idx = blknr / blk_per_grp;
-			if (fs->blksz == 1024) {
-				remainder = blknr % blk_per_grp;
-				if (!remainder)
-					bg_idx--;
-			}
-			ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
-						bg_idx);
-			debug("ActualB releasing %ld: %d\n", blknr, bg_idx);
+	/* release data blocks */
+	for (i = 0; i < no_blocks; i++) {
+		blknr = read_allocated_block(&inode, i);
+		bg_idx = blknr / blk_per_grp;
+		if (fs->blksz == 1024) {
+			remainder = blknr % blk_per_grp;
+			if (!remainder)
+				bg_idx--;
+		}
+		ext4fs_reset_block_bmap(blknr, fs->blk_bmaps[bg_idx],
+					bg_idx);
+		debug("EXT4 Block releasing %ld: %d\n", blknr, bg_idx);
 
-			ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
-			ext4fs_sb_free_blocks_inc(fs->sb);
-			/* journal backup */
-			if (prev_bg_bmap_idx != bg_idx) {
-				memset(journal_buffer, '\0', fs->blksz);
-				status = ext4fs_devread(
-							(lbaint_t)le32_to_cpu(bgd[bg_idx].block_id)
-							* fs->sect_perblk,
-							0, fs->blksz,
-							journal_buffer);
-				if (status == 0)
-					goto fail;
-				if (ext4fs_log_journal(journal_buffer,
-						le32_to_cpu(bgd[bg_idx].block_id)))
-					goto fail;
-				prev_bg_bmap_idx = bg_idx;
-			}
+		ext4fs_bg_free_blocks_inc(&bgd[bg_idx]);
+		ext4fs_sb_free_blocks_inc(fs->sb);
+		/* journal backup */
+		if (prev_bg_bmap_idx != bg_idx) {
+			uint32_t bgd_blknr = le32_to_cpu(bgd[bg_idx].block_id);
+			status = ext4fs_devread((lbaint_t)bgd_blknr *
+						fs->sect_perblk,
+						0, fs->blksz,
+						journal_buffer);
+			if (status == 0)
+				goto fail;
+			if (ext4fs_log_journal(journal_buffer, bgd_blknr))
+				goto fail;
+			prev_bg_bmap_idx = bg_idx;
 		}
 	}
 
+	/* release inode */
 	/* from the inode no to blockno */
 	inodes_per_block = fs->blksz / fs->inodesz;
 	ibmap_idx = inodeno / inode_per_grp;