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Date:   Fri, 19 Jun 2020 00:27:27 +0900
From:   Wang Shilong <wangshilong1991@...il.com>
To:     linux-ext4@...r.kernel.org
Cc:     lixi@....com, adilger@...ger.ca, wangshilong1991@...il.com,
        sihara@....com, Wang Shilong <wshilong@....com>
Subject: [RFC PATCH v2 24/51] e2fsck: merge dblist after thread finishes

From: Li Xi <lixi@....com>

Signed-off-by: Li Xi <lixi@....com>
Signed-off-by: Wang Shilong <wshilong@....com>
---
 e2fsck/pass1.c      | 18 +++++++++++++-----
 lib/ext2fs/dblist.c | 36 ++++++++++++++++++++++++++++++++++++
 lib/ext2fs/ext2fs.h |  1 +
 3 files changed, 50 insertions(+), 5 deletions(-)

diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index 3c04edfd..7accc76c 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -2266,18 +2266,21 @@ static int _e2fsck_pass1_merge_fs(ext2_filsys dest, ext2_filsys src)
 	ext2fs_inode_bitmap inode_map;
 	ext2fs_block_bitmap block_map;
 	ext2_badblocks_list badblocks;
+	ext2_dblist dblist;
 
 	dest_io = dest->io;
 	dest_image_io = dest->image_io;
 	inode_map = dest->inode_map;
 	block_map = dest->block_map;
 	badblocks = dest->badblocks;
+	dblist = dest->dblist;
 	memcpy(dest, src, sizeof(struct struct_ext2_filsys));
 	dest->io = dest_io;
 	dest->image_io = dest_image_io;
 	dest->inode_map = inode_map;
 	dest->block_map = block_map;
 	dest->badblocks = badblocks;
+	dest->dblist = dblist;
 	/*
 	 * PASS1_MERGE_FS_BITMAP might return directly from this function,
 	 * so please do NOT leave any garbage behind after returning.
@@ -2286,11 +2289,16 @@ static int _e2fsck_pass1_merge_fs(ext2_filsys dest, ext2_filsys src)
 	PASS1_MERGE_FS_BITMAP(dest, src, block_map);
 
 	if (src->dblist) {
-		retval = ext2fs_copy_dblist(src->dblist, &dest->dblist);
-		if (retval)
-			return retval;
-		/* The ext2fs_copy_dblist() uses the src->fs as the fs */
-		dest->dblist->fs = dest;
+		if (dest->dblist) {
+			retval = ext2fs_merge_dblist(src->dblist, dest->dblist);
+			if (retval)
+				return retval;
+		} else {
+			/* The ext2fs_copy_dblist() uses the src->fs as the fs */
+			dest->dblist = src->dblist;
+			dest->dblist->fs = dest;
+			src->dblist = NULL;
+		}
 	}
 
 	if (src->badblocks) {
diff --git a/lib/ext2fs/dblist.c b/lib/ext2fs/dblist.c
index bbdb221d..046b1e68 100644
--- a/lib/ext2fs/dblist.c
+++ b/lib/ext2fs/dblist.c
@@ -119,6 +119,42 @@ errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
 	return 0;
 }
 
+/*
+ * Merge a directory block list @src to @dest
+ */
+errcode_t ext2fs_merge_dblist(ext2_dblist src, ext2_dblist dest)
+{
+	int			 src_count = src->count;
+	int			 dest_count = dest->count;
+	int			 size = src_count + dest_count;
+	int			 size_entry = sizeof(struct ext2_db_entry2);
+	struct ext2_db_entry2	*array, *array2;
+	errcode_t		 retval;
+
+	if (src_count == 0)
+		return 0;
+
+	if (src->sorted || dest->sorted)
+		return EINVAL;
+
+	retval = ext2fs_get_array(size, size_entry, &array);
+	if (retval)
+		return retval;
+
+	array2 = array;
+
+	memcpy(array, src->list, src_count * size_entry);
+	array += src_count;
+	memcpy(array, dest->list, dest_count * size_entry);
+	ext2fs_free_mem(&dest->list);
+
+	dest->list = array2;
+	dest->count = src_count + dest_count;
+	dest->size = size;
+
+	return 0;
+}
+
 /*
  * Close a directory block list
  *
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 5a094da3..37460a31 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -1120,6 +1120,7 @@ extern errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino,
 				      blk_t blk, int blockcnt);
 extern errcode_t ext2fs_add_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
 				       blk64_t blk, e2_blkcnt_t blockcnt);
+extern errcode_t ext2fs_merge_dblist(ext2_dblist src, ext2_dblist dest);
 extern void ext2fs_dblist_sort(ext2_dblist dblist,
 			       EXT2_QSORT_TYPE (*sortfunc)(const void *,
 							   const void *));
-- 
2.25.4

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