From: Eric Sandeen <sandeen@redhat.com>
Date: Mon, 7 Mar 2016 02:51:23 +0000 (-0500)
Subject: resize2fs: clear uninit BG if allocating from new group
X-Git-Tag: v1.43-WIP-2016-03-15~19
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=f3745728bc254892da4c569ba3fd8801895f3524;p=thirdparty%2Fe2fsprogs.git

resize2fs: clear uninit BG if allocating from new group

If resize2fs_get_alloc_block() allocates from a BLOCK_UNINIT group, we
need to make sure that the UNINIT flag is cleared on both file system
structures which are maintained by resize2fs.  This causes the
modified bitmaps to not get written out, which leads to post-resize2fs
e2fsck errors; used blocks in UNINIT groups, not marked in the block
bitmap.  This was seen on r_ext4_small_bg.

This patch uses clear_block_uninit() to clear the flag,
and my problem goes away.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/lib/ext2fs/alloc.c b/lib/ext2fs/alloc.c
index 86e7f9983..ce59e8553 100644
--- a/lib/ext2fs/alloc.c
+++ b/lib/ext2fs/alloc.c
@@ -39,7 +39,7 @@
 /*
  * Clear the uninit block bitmap flag if necessary
  */
-static void clear_block_uninit(ext2_filsys fs, dgrp_t group)
+void ext2fs_clear_block_uninit(ext2_filsys fs, dgrp_t group)
 {
 	if (!ext2fs_has_group_desc_csum(fs) ||
 	    !(ext2fs_bg_flags_test(fs, group, EXT2_BG_BLOCK_UNINIT)))
@@ -183,7 +183,7 @@ allocated:
 	if (retval)
 		return retval;
 
-	clear_block_uninit(fs, ext2fs_group_of_blk2(fs, b));
+	ext2fs_clear_block_uninit(fs, ext2fs_group_of_blk2(fs, b));
 	*ret = b;
 	return 0;
 }
@@ -455,7 +455,7 @@ errcode_t ext2fs_new_range(ext2_filsys fs, int flags, blk64_t goal,
 allocated:
 			for (b = start; b < end;
 			     b += fs->super->s_blocks_per_group)
-				clear_block_uninit(fs,
+				ext2fs_clear_block_uninit(fs,
 						ext2fs_group_of_blk2(fs, b));
 			return 0;
 		}
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index c98355db3..838b04709 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -648,6 +648,7 @@ static inline int ext2fs_needs_large_file_feature(unsigned long long file_size)
 }
 
 /* alloc.c */
+extern void ext2fs_clear_block_uninit(ext2_filsys fs, dgrp_t group);
 extern errcode_t ext2fs_new_inode(ext2_filsys fs, ext2_ino_t dir, int mode,
 				  ext2fs_inode_bitmap map, ext2_ino_t *ret);
 extern errcode_t ext2fs_new_block(ext2_filsys fs, blk_t goal,
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index d0a525b20..36da253fc 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -1622,6 +1622,7 @@ static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
 {
 	ext2_resize_t rfs = (ext2_resize_t) fs->priv_data;
 	blk64_t blk;
+	int group;
 
 	blk = get_new_block(rfs);
 	if (!blk)
@@ -1634,6 +1635,12 @@ static errcode_t resize2fs_get_alloc_block(ext2_filsys fs,
 
 	ext2fs_mark_block_bitmap2(rfs->old_fs->block_map, blk);
 	ext2fs_mark_block_bitmap2(rfs->new_fs->block_map, blk);
+
+	group = ext2fs_group_of_blk2(rfs->old_fs, blk);
+	ext2fs_clear_block_uninit(rfs->old_fs, group);
+	group = ext2fs_group_of_blk2(rfs->new_fs, blk);
+	ext2fs_clear_block_uninit(rfs->new_fs, group);
+
 	*ret = (blk64_t) blk;
 	return 0;
 }