linux-ext4 - [PATCH 04/10] ext2fs: Don't create filesystems with meta_bg and resize

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Message-Id: <20180530125118.25274-5-jack@suse.cz>
Date:   Wed, 30 May 2018 14:51:12 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 04/10] ext2fs: Don't create filesystems with meta_bg and resize_inode

ext2fs_initialize() may end up enabling meta_bg feature for filesystem
which have resize_inode. Such combination is invalid to make sure we
disable resize_inode when enabling meta_bg.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 lib/ext2fs/initialize.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/lib/ext2fs/initialize.c b/lib/ext2fs/initialize.c
index e1eff22eac33..8c9e97fee831 100644
--- a/lib/ext2fs/initialize.c
+++ b/lib/ext2fs/initialize.c
@@ -382,6 +382,13 @@ ipg_retry:
 		retval = EXT2_ET_RES_GDT_BLOCKS;
 		goto cleanup;
 	}
+	/* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
+	if (super->s_reserved_gdt_blocks + fs->desc_blocks >
+	    super->s_blocks_per_group * 3 / 4) {
+		ext2fs_set_feature_meta_bg(fs->super);
+		ext2fs_clear_feature_resize_inode(fs->super);
+		set_field(s_reserved_gdt_blocks, 0);
+	}
 
 	/*
 	 * Calculate the maximum number of bookkeeping blocks per
@@ -392,11 +399,6 @@ ipg_retry:
 	overhead = (int) (3 + fs->inode_blocks_per_group +
 			  super->s_reserved_gdt_blocks);
 
-	/* Enable meta_bg if we'd lose more than 3/4 of a BG to GDT blocks. */
-	if (super->s_reserved_gdt_blocks + fs->desc_blocks >
-	    super->s_blocks_per_group * 3 / 4)
-		ext2fs_set_feature_meta_bg(fs->super);
-
 	if (ext2fs_has_feature_meta_bg(fs->super))
 		overhead++;
 	else
-- 
2.13.6