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ext4: preserve SB_I_VERSION on remount

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[ Upstream commit f2326fd14a224e4cccbab89e14c52279ff79b7ec ]

IMA testing revealed that after an ext4 remount, file accesses triggered
full measurements even without modifications, instead of skipping as
expected when i_version is unchanged.

Debugging showed `SB_I_VERSION` was cleared in reconfigure_super() during
remount due to commit 1ff2030739 ("ext4: unconditionally enable the
i_version counter") removing the fix from commit 960e0ab63b ("ext4: fix
i_version handling on remount").

To rectify this, `SB_I_VERSION` is always set for `fc->sb_flags` in
ext4_init_fs_context(), instead of `sb->s_flags` in __ext4_fill_super(),
ensuring it persists across all mounts.

Cc: stable@kernel.org
Fixes: 1ff2030739 ("ext4: unconditionally enable the i_version counter")
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20250703073903.6952-2-libaokun@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baokun Li 2025-08-22 10:19:40 -04:00 committed by Greg Kroah-Hartman
parent 047b4cb30e
commit 342f7a1dda
1 changed files with 3 additions and 3 deletions
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6
fs/ext4/super.c
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@ -2028,6 +2028,9 @@ int ext4_init_fs_context(struct fs_context *fc)
fc->fs_private = ctx;
fc->ops = &ext4_context_ops;
/* i_version is always enabled now */
fc->sb_flags |= SB_I_VERSION;
return 0;
}
@ -5305,9 +5308,6 @@ static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
/* i_version is always enabled now */
sb->s_flags |= SB_I_VERSION;
err = ext4_check_feature_compatibility(sb, es, silent);
if (err)
goto failed_mount;