From d9112409a2655851d9c88680764b0bbc591c4a4b Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Thu, 18 Sep 2014 21:24:26 -0400 Subject: [PATCH] misc: zero s_jnl_blocks when adding journal online or removing external journal Erase s_jnl_blocks when removing an external journal, or adding an internal journal online. We can't add the backup for the internal journal because we have no good way to get the indirect block or ETB addresses, so the best we can do is hope that the user runs e2fsck, which will correct that. We are motivated to erase during external journal removal to state emphatically that there's no journal. Signed-off-by: Darrick J. Wong Reported-by: thomas_reardon@hotmail.com Signed-off-by: Theodore Ts'o --- lib/ext2fs/mkjournal.c | 2 ++ misc/tune2fs.c | 1 + 2 files changed, 3 insertions(+) diff --git a/lib/ext2fs/mkjournal.c b/lib/ext2fs/mkjournal.c index 96b6d36..e6d04c4 100644 --- a/lib/ext2fs/mkjournal.c +++ b/lib/ext2fs/mkjournal.c @@ -582,6 +582,8 @@ errcode_t ext2fs_add_journal_inode2(ext2_filsys fs, blk_t num_blocks, goto errout; } journal_ino = st.st_ino; + memset(fs->super->s_jnl_blocks, 0, + sizeof(fs->super->s_jnl_blocks)); } else { if ((mount_flags & EXT2_MF_BUSY) && !(fs->flags & EXT2_FLAG_EXCLUSIVE)) { diff --git a/misc/tune2fs.c b/misc/tune2fs.c index b65dab9..fe2c8ae 100644 --- a/misc/tune2fs.c +++ b/misc/tune2fs.c @@ -304,6 +304,7 @@ no_valid_journal: return 1; } fs->super->s_journal_dev = 0; + memset(fs->super->s_jnl_blocks, 0, sizeof(fs->super->s_jnl_blocks)); uuid_clear(fs->super->s_journal_uuid); ext2fs_mark_super_dirty(fs); fputs(_("Journal removed\n"), stdout); -- 1.8.3.1