This is a note to let you know that I've just added the patch titled
ubifs: Reserve one leb for each journal head while doing budget
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ubifs-reserve-one-leb-for-each-journal-head-while-do.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b094c374b7d32b88d27001de099c6901f118977b
Author: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Date: Tue Oct 11 11:47:32 2022 +0800
ubifs: Reserve one leb for each journal head while doing budget
[ Upstream commit e874dcde1cbf82c786c0e7f2899811c02630cc52 ]
UBIFS calculates available space by c->main_bytes - c->lst.total_used
(which means non-index lebs' free and dirty space is accounted into
total available), then index lebs and four lebs (one for gc_lnum, one
for deletions, two for journal heads) are deducted.
In following situation, ubifs may get -ENOSPC from make_reservation():
LEB 84: DATAHD free 122880 used 1920 dirty 2176 dark 6144
LEB 110:DELETION free 126976 used 0 dirty 0 dark 6144 (empty)
LEB 201:gc_lnum free 126976 used 0 dirty 0 dark 6144
LEB 272:GCHD free 77824 used 47672 dirty 1480 dark 6144
LEB 356:BASEHD free 0 used 39776 dirty 87200 dark 6144
OTHERS: index lebs, zero-available non-index lebs
UBIFS calculates the available bytes is 6888 (How to calculate it:
126976 * 5[remain main bytes] - 1920[used] - 47672[used] - 39776[used] -
126976 * 1[deletions] - 126976 * 1[gc_lnum] - 126976 * 2[journal heads]
- 6144 * 5[dark] = 6888) after doing budget, however UBIFS cannot use
BASEHD's dirty space(87200), because UBIFS cannot find next BASEHD to
reclaim current BASEHD. (c->bi.min_idx_lebs equals to c->lst.idx_lebs,
the empty leb won't be found by ubifs_find_free_space(), and dirty index
lebs won't be picked as gced lebs. All non-index lebs has dirty space
less then c->dead_wm, non-index lebs won't be picked as gced lebs
either. So new free lebs won't be produced.). See more details in Link.
To fix it, reserve one leb for each journal head while doing budget.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216562
Fixes: 1e51764a3c2ac0 ("UBIFS: add new flash file system")
Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index bdb79be6dc0e2..9cb05ef9b9dd9 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -212,11 +212,10 @@ long long ubifs_calc_available(const struct ubifs_info *c, int min_idx_lebs)
subtract_lebs += 1;
/*
- * The GC journal head LEB is not really accessible. And since
- * different write types go to different heads, we may count only on
- * one head's space.
+ * Since different write types go to different heads, we should
+ * reserve one leb for each head.
*/
- subtract_lebs += c->jhead_cnt - 1;
+ subtract_lebs += c->jhead_cnt;
/* We also reserve one LEB for deletions, which bypass budgeting */
subtract_lebs += 1;
