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From e9d972c483d98b6b6fc9251166a1f5c2ca37ac5e Mon Sep 17 00:00:00 2001
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From: Lukas Czerner <lczerner@redhat.com>
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Date: Wed, 8 Aug 2018 13:52:56 +0200
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Subject: [PATCH 06/16] e2fsck: remove resize inode if both resize_inode and
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meta_bg are enabled
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commit 74848259f0dd42bd478f0541c94f31ccd68eac3c
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Previous e2fsprogs versions allowed to create a file system with both
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resize_inode and meta_bg enabled. This was fixed by upstream commit
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42e77d5d ("libext2fs: don't create filesystems with meta_bg and resize_inode")
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However e2fsck still does not recognize the conflict and will attempt to
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clear and recreate resize_inode if it's corrupted due to this incompatible
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feature combination, though it will create it in the same wrong layout.
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Fix it by teaching e2fsck to recognize resize_inode and meta_bg
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conflict and fixing it by disabling and clearing resize inode.
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Signed-off-by: Lukas Czerner <lczerner@redhat.com>
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Reviewed-by: Andreas Dilger <adilger@dilger.ca>
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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---
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e2fsck/problem.c | 6 ++++++
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e2fsck/problem.h | 3 +++
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e2fsck/super.c | 8 ++++++++
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3 files changed, 17 insertions(+)
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diff --git a/e2fsck/problem.c b/e2fsck/problem.c
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index 83584a08..a01b2560 100644
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--- a/e2fsck/problem.c
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+++ b/e2fsck/problem.c
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@@ -438,6 +438,12 @@ static struct e2fsck_problem problem_table[] = {
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N_("@S 64bit filesystems needs extents to access the whole disk. "),
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PROMPT_FIX, PR_PREEN_OK | PR_NO_OK},
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+ /* Meta_bg and resize_inode are not compatible, disable resize_inode*/
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+ { PR_0_DISABLE_RESIZE_INODE,
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+ N_("Resize_@i and meta_bg features are enabled. Those features are\n"
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+ "not compatible. Resize @i should be disabled. "),
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+ PROMPT_FIX, 0 },
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+
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/* Pass 1 errors */
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/* Pass 1: Checking inodes, blocks, and sizes */
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diff --git a/e2fsck/problem.h b/e2fsck/problem.h
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index 6cb09cfb..cf2df8ce 100644
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--- a/e2fsck/problem.h
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+++ b/e2fsck/problem.h
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@@ -252,6 +252,9 @@ struct problem_context {
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/* 64bit is set but extents are not set. */
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#define PR_0_64BIT_WITHOUT_EXTENTS 0x000048
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+/* Meta_bg and resize_inode are not compatible, remove resize_inode*/
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+#define PR_0_DISABLE_RESIZE_INODE 0x000051
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+
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/*
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* Pass 1 errors
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*/
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diff --git a/e2fsck/super.c b/e2fsck/super.c
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index a6be3c69..7e2c2e4f 100644
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--- a/e2fsck/super.c
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+++ b/e2fsck/super.c
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@@ -326,6 +326,14 @@ void check_resize_inode(e2fsck_t ctx)
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clear_problem_context(&pctx);
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+ if (fs->super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE &&
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+ fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG &&
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+ fix_problem(ctx, PR_0_DISABLE_RESIZE_INODE, &pctx)) {
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+ fs->super->s_feature_compat &= ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
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+ fs->super->s_reserved_gdt_blocks = 0;
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+ ext2fs_mark_super_dirty(fs);
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+ }
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+
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/*
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* If the resize inode feature isn't set, then
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* s_reserved_gdt_blocks must be zero.
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--
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2.20.1
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