From 8c230d9a5b5ec7970139acb7e2d165d7a3fe9f9e Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Wed, 20 Apr 2011 18:02:45 +0300 Subject: [PATCH] UBIFS: fix false space checking failure This patch fixes UBIFS mount failure when the debugging support is enabled, we are recovering from a power cut, we were first mounter R/O and we are re-mounting R/W. In this case we should not assume that the amount of free space before we have re-mounted R/W and after are equivalent, because when we have mounted R/O the file-system is in a non-committed state so the amount of free space is slightly smaller, due to the fact that we cannot predict the amount of free space precisely before we commit. This patch fixes the issue by skipping the debugging check in case of recovery. This issue was reported by Caizhiyong here: http://thread.gmane.org/gmane.linux.drivers.mtd/34350/focus=34387 Signed-off-by: Artem Bityutskiy Reported-by: Caizhiyong Cc: stable@kernel.org [2.6.30+] --- fs/ubifs/super.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index c75f6133206c..ec33b0670d02 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1671,14 +1671,25 @@ static int ubifs_remount_rw(struct ubifs_info *c) if (err) goto out; + dbg_gen("re-mounted read-write"); + c->remounting_rw = 0; + if (c->need_recovery) { c->need_recovery = 0; ubifs_msg("deferred recovery completed"); + } else { + /* + * Do not run the debugging space check if the were doing + * recovery, because when we saved the information we had the + * file-system in a state where the TNC and lprops has been + * modified in memory, but all the I/O operations (including a + * commit) were deferred. So the file-system was in + * "non-committed" state. Now the file-system is in committed + * state, and of course the amount of free space will change + * because, for example, the old index size was imprecise. + */ + err = dbg_check_space_info(c); } - - dbg_gen("re-mounted read-write"); - c->remounting_rw = 0; - err = dbg_check_space_info(c); mutex_unlock(&c->umount_mutex); return err; -- 2.39.5