linux-ext4 - tune2fs: check whether filesystem is in use for I_flag and Q

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Message-ID: <3a908642-b2ff-b4c3-b0c9-add71f764267@huawei.com>
Date:   Mon, 20 Mar 2023 13:03:20 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     <linux-ext4@...r.kernel.org>
CC:     "Theodore Y. Ts'o" <tytso@....edu>, <adilger@...mcloud.com>,
        <jack@...e.cz>, linfeilong <linfeilong@...wei.com>,
        wuguanghao <wuguanghao3@...wei.com>,
        zhanchengbin <zhanchengbin1@...wei.com>, <libaokun1@...wei.com>
Subject: tune2fs: check whether filesystem is in use for I_flag and Q_flag
 test

From: Zhiqiang Liu <liuzhiqiang26@...wei.com>

For changing inode size (-I) and setting quota fearture (-Q), tune2fs
only check whether the filesystem is umounted. Considering mount
namepspaces, the filesystem is umounted, however it already be left
in other mount namespace.
So we add one check whether the filesystem is not in use with using
EXT2_MF_BUSY flag, which can indicate the device is already opened
with O_EXCL, as suggested by Ted.

Reported-by: Baokun Li <libaokun1@...wei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
Signed-off-by: zhanchengbin <zhanchengbin1@...wei.com>
---
 misc/tune2fs.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index 458f7cf6..d75f4d94 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -3520,9 +3520,9 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
 	}

 	if (Q_flag) {
-		if (mount_flags & EXT2_MF_MOUNTED) {
+		if (mount_flags & (EXT2_MF_BUSY | EXT2_MF_MOUNTED)) {
 			fputs(_("The quota feature may only be changed when "
-				"the filesystem is unmounted.\n"), stderr);
+				"the filesystem is unmounted and not in use.\n"), stderr);
 			rc = 1;
 			goto closefs;
 		}
@@ -3673,10 +3673,10 @@ _("Warning: The journal is dirty. You may wish to replay the journal like:\n\n"
 	}

 	if (I_flag) {
-		if (mount_flags & EXT2_MF_MOUNTED) {
+		if (mount_flags & (EXT2_MF_BUSY | EXT2_MF_MOUNTED)) {
 			fputs(_("The inode size may only be "
 				"changed when the filesystem is "
-				"unmounted.\n"), stderr);
+				"unmounted and not in use.\n"), stderr);
 			rc = 1;
 			goto closefs;
 		}
-- 
2.33.0