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| author | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2012-10-09 16:20:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 11:34:34 -0800 |
| commit | ad33dc05bfe7c600d898e1f7857d1fd51308ba09 (patch) | |
| tree | 474a165a64f114c08995e9b3511ada2f0eb84afd /fs/ubifs | |
| parent | bb71076311ea0990cf8989aa13909191801acea2 (diff) | |
| download | lwn-ad33dc05bfe7c600d898e1f7857d1fd51308ba09.tar.gz lwn-ad33dc05bfe7c600d898e1f7857d1fd51308ba09.zip | |
UBIFS: fix mounting problems after power cuts
commit a28ad42a4a0c6f302f488f26488b8b37c9b30024 upstream.
This is a bugfix for a problem with the following symptoms:
1. A power cut happens
2. After reboot, we try to mount UBIFS
3. Mount fails with "No space left on device" error message
UBIFS complains like this:
UBIFS error (pid 28225): grab_empty_leb: could not find an empty LEB
The root cause of this problem is that when we mount, not all LEBs are
categorized. Only those which were read are. However, the
'ubifs_find_free_leb_for_idx()' function assumes that all LEBs were
categorized and 'c->freeable_cnt' is valid, which is a false assumption.
This patch fixes the problem by teaching 'ubifs_find_free_leb_for_idx()'
to always fall back to LPT scanning if no freeable LEBs were found.
This problem was reported by few people in the past, but Brent Taylor
was able to reproduce it and send me a flash image which cannot be mounted,
which made it easy to hunt the bug. Kudos to Brent.
Reported-by: Brent Taylor <motobud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ubifs')
| -rw-r--r-- | fs/ubifs/find.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/ubifs/find.c b/fs/ubifs/find.c index 2559d174e004..5dc48cacb5a0 100644 --- a/fs/ubifs/find.c +++ b/fs/ubifs/find.c @@ -681,8 +681,16 @@ int ubifs_find_free_leb_for_idx(struct ubifs_info *c) if (!lprops) { lprops = ubifs_fast_find_freeable(c); if (!lprops) { - ubifs_assert(c->freeable_cnt == 0); - if (c->lst.empty_lebs - c->lst.taken_empty_lebs > 0) { + /* + * The first condition means the following: go scan the + * LPT if there are uncategorized lprops, which means + * there may be freeable LEBs there (UBIFS does not + * store the information about freeable LEBs in the + * master node). + */ + if (c->in_a_category_cnt != c->main_lebs || + c->lst.empty_lebs - c->lst.taken_empty_lebs > 0) { + ubifs_assert(c->freeable_cnt == 0); lprops = scan_for_leb_for_idx(c); if (IS_ERR(lprops)) { err = PTR_ERR(lprops); |