linux-ext4 - [PATCH RFC] ext4: Actually request zeroing of inode table after grow

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Date:   Tue, 16 Apr 2019 18:53:12 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     tytso@....edu, adilger.kernel@...ger.ca, ktkhai@...tuozzo.com,
        linux-ext4@...r.kernel.org
Subject: [PATCH RFC] ext4: Actually request zeroing of inode table after grow

[Hi!
 I occasionally found this place, and not familiar with ext4.
 But this place looks like doing the wrong thing.
 s_groups_count may only work, and there must be another sign.
 Please, take a look.
]

It is never possible, that number of block groups decreases,
since only online grow is supported.

But after a growing occured, we have to zero inode tables
for just created new block groups.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 fs/ext4/ioctl.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index bab3da4f1e0d..20faa6a69238 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -978,7 +978,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		if (err == 0)
 			err = err2;
 		mnt_drop_write_file(filp);
-		if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
+		if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
 		    ext4_has_group_desc_csum(sb) &&
 		    test_opt(sb, INIT_INODE_TABLE))
 			err = ext4_register_li_request(sb, o_group);