lkml.org 
[lkml]   [2022]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ext4: fix error when itable blocks is greater than s_itb_per_group
Date
The following error occurs when mounting the ext4 image made by image
making tool:
"ext4_init_inode_table:1301:comm ext4lazyinit:Something is wrong with group
0: used itable blocks: 491; itable unused count: 0."

Currently all the inodes in block group0 and ext4 image is divided by
s_inodes_per_group. That leads to a hazard: we can't ensure all
s_inodes_per_group are divisible by s_inodes_per_block. For example, when
the s_inodes_per_group (equals to 7851) is divided by s_inodes_per_block
(which is 16), because 7851 is undivisible by 16, we get the wrong result
490, while 491 is expected.

So, we suggest that s_itb_per_group should equal to
DIV_ROUND_UP(s_inodes_per_group, s_inodes_per_block) instead of directly
getting the result from s_inodes_per_group/s_inodes_per_block.

Signed-off-by: Michael Wu <michael@allwinnertech.com>
---
fs/ext4/super.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 845f2f8aee5f..76cbd638ea10 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -4796,8 +4796,8 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sbi->s_inodes_per_group);
goto failed_mount;
}
- sbi->s_itb_per_group = sbi->s_inodes_per_group /
- sbi->s_inodes_per_block;
+ sbi->s_itb_per_group = DIV_ROUND_UP(sbi->s_inodes_per_group,
+ sbi->s_inodes_per_block);
sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
sbi->s_sbh = bh;
sbi->s_mount_state = le16_to_cpu(es->s_state) & ~EXT4_FC_REPLAY;
--
2.29.0
\
 
 \ /
  Last update: 2022-08-02 04:11    [W:0.046 / U:0.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site