From patchwork Wed Oct 24 10:40:40 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [RFC] Ext4: Mount partition as read only if during orphan cleanup truncate fails to obtain journal handle. Date: Wed, 24 Oct 2012 00:40:40 -0000 From: Ashish Sangwan X-Patchwork-Id: 193735 Message-Id: <1351075240-2725-1-git-send-email-ashish.sangwan2@gmail.com> To: tytso@mit.edu Cc: linux-ext4@vger.kernel.org, Ashish Sangwan , Namjae Jeon During orphan cleanup while doing truncate, if we fail to obtain journal handle, the inode for which truncate was called would not be removed from both the on-disk and in-memory orphan lists as the call to ext4_orphan_del would not be executed. This would have following consequences: a) As the inode is not removed from the on-disk list, truncate would be called again for the same inode. Each call would add the inode to the in-memory list. This operation would continue endlessly or until truncate is succeed. b) If somehow, after some iterations, truncate is succeed, ext4_orphan_del will only remove the inode from in-memory list just 1 time. This will trigger j_assert during put super. This patch handles both the problems. If truncate fails, first in-memory list is cleared and than the partition is mounted as read only. Failure to obtain journal handle during mount may suggest that journal device is corrupted. Signed-off-by: Ashish Sangwan Signed-off-by: Namjae Jeon --- fs/ext4/super.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4e2aacb..859eccb 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -2201,7 +2201,21 @@ static void ext4_orphan_cleanup(struct super_block *sb, jbd_debug(2, "truncating inode %lu to %lld bytes\n", inode->i_ino, inode->i_size); ext4_truncate(inode); - nr_truncates++; + if (list_empty(&EXT4_I(inode)->i_orphan)) { + nr_truncates++; + } else { + /* Remove inode from in-memory orphan list */ + list_del_init(&EXT4_I(inode)->i_orphan); + ext4_msg(sb, KERN_ERR, "Truncate failed for " + "orphan inode = %lu. Running e2fsck" + " is recommended", inode->i_ino); + if (!(s_flags & MS_RDONLY)) { + ext4_msg(sb, KERN_INFO, "FS would be" + " mounted as readonly"); + s_flags |= MS_RDONLY; + } + break; + } } else { ext4_msg(sb, KERN_DEBUG, "%s: deleting unreferenced inode %lu",