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From 06b155bff995fe13d68cc2829121d0d719e6fde7 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 9 Aug 2014 12:31:04 -0400
Subject: [PATCH 1/5] e2fsck: fix file systems with an overly large
s_first_meta_bg
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
e2fsck/problem.c | 5 +++++
e2fsck/problem.h | 3 +++
e2fsck/super.c | 12 ++++++++++++
3 files changed, 20 insertions(+)
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 2e41bb2e..6c7f514e 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -438,6 +438,11 @@ static struct e2fsck_problem problem_table[] = {
N_("@S 64bit filesystems needs extents to access the whole disk. "),
PROMPT_FIX, PR_PREEN_OK | PR_NO_OK},
+ /* The first_meta_bg is too big */
+ { PR_0_FIRST_META_BG_TOO_BIG,
+ N_("First_meta_bg is too big. (%N, max value %g). "),
+ PROMPT_CLEAR, 0 },
+
/* Meta_bg and resize_inode are not compatible, disable resize_inode*/
{ PR_0_DISABLE_RESIZE_INODE,
N_("Resize_@i and meta_bg features are enabled. Those features are\n"
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index a591974e..2fc9be05 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -252,6 +252,9 @@ struct problem_context {
/* 64bit is set but extents are not set. */
#define PR_0_64BIT_WITHOUT_EXTENTS 0x000048
+/* The first_meta_bg is too big */
+#define PR_0_FIRST_META_BG_TOO_BIG 0x000049
+
/* Meta_bg and resize_inode are not compatible, remove resize_inode*/
#define PR_0_DISABLE_RESIZE_INODE 0x000051
diff --git a/e2fsck/super.c b/e2fsck/super.c
index 7e2c2e4f..7439d9d4 100644
--- a/e2fsck/super.c
+++ b/e2fsck/super.c
@@ -599,6 +599,18 @@ void check_super_block(e2fsck_t ctx)
ext2fs_mark_super_dirty(fs);
}
+ if ((fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) &&
+ (fs->super->s_first_meta_bg > fs->desc_blocks)) {
+ pctx.group = fs->desc_blocks;
+ pctx.num = fs->super->s_first_meta_bg;
+ if (fix_problem(ctx, PR_0_FIRST_META_BG_TOO_BIG, &pctx)) {
+ fs->super->s_feature_incompat &=
+ ~EXT2_FEATURE_INCOMPAT_META_BG;
+ fs->super->s_first_meta_bg = 0;
+ ext2fs_mark_super_dirty(fs);
+ }
+ }
+
/*
* Verify the group descriptors....
*/
--
2.21.3