5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
[ Upstream commit 84a2bee9c49769310efa19601157ef50a1df1267 ]
Since commit e874dcde1cbf ("ubifs: Reserve one leb for each journal
head while doing budget"), available space is calulated by deducting
reservation for all journal heads. However, the total block count (
which is only used by statfs) is not updated yet, which will cause
the wrong displaying for used space(total - available).
Fix it by deducting reservation for all journal heads from total
block count.
Fixes: e874dcde1cbf ("ubifs: Reserve one leb for each journal head while doing budget")
Signed-off-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/ubifs/super.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 32c1f428054b7..e0420688bf918 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -777,10 +777,10 @@ static void init_constants_master(struct ubifs_info *c)
* necessary to report something for the 'statfs()' call.
*
* Subtract the LEB reserved for GC, the LEB which is reserved for
- * deletions, minimum LEBs for the index, and assume only one journal
- * head is available.
+ * deletions, minimum LEBs for the index, the LEBs which are reserved
+ * for each journal head.
*/
- tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt + 1;
+ tmp64 = c->main_lebs - 1 - 1 - MIN_INDEX_LEBS - c->jhead_cnt;
tmp64 *= (long long)c->leb_size - c->leb_overhead;
tmp64 = ubifs_reported_space(c, tmp64);
c->block_cnt = tmp64 >> UBIFS_BLOCK_SHIFT;
--
2.43.0
