The branch releng/13.0 has been updated by emaste:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=8d25741b633af6652fe8bfff1cb157a31e66cc60

commit 8d25741b633af6652fe8bfff1cb157a31e66cc60
Author:     Ed Maste <ema...@freebsd.org>
AuthorDate: 2021-03-02 22:35:48 +0000
Commit:     Ed Maste <ema...@freebsd.org>
CommitDate: 2021-03-06 19:46:31 +0000

    growfs: allow operation on RW-mounted filesystems
    
    growfs supports growing mounted filesystems (writes are temporarily
    suspended while the grow happens).  Drop the check for fs_clean == 0
    to restore this case.  Leave fs_flags check for FS_UNCLEAN or
    FS_NEEDSFSCK which represent the state of the filesystem when it was
    mounted, and fsck should be run first if they are set.
    
    PR:             253754
    Reviewed by:    mckusick
    Approved by:    re (gjb)
    Fixes:          6eb925f8450f ("Filesystem utilities that modify the...")
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D29021
    
    (cherry picked from commit 0dcde5cc12744e5188300711a8829e5e6a9cd0de)
    (cherry picked from commit b5920128c7ebcf5060605928263a54b31b317993)
---
 sbin/growfs/growfs.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/sbin/growfs/growfs.c b/sbin/growfs/growfs.c
index d1098210f088..510192dada0b 100644
--- a/sbin/growfs/growfs.c
+++ b/sbin/growfs/growfs.c
@@ -1461,10 +1461,9 @@ main(int argc, char **argv)
                }
        }
        /*
-        * Check for unclean filesystem.
+        * Check for filesystem that was unclean at mount time.
         */
-       if (fs->fs_clean == 0 ||
-           (fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0)
+       if ((fs->fs_flags & (FS_UNCLEAN | FS_NEEDSFSCK)) != 0)
                errx(1, "%s is not clean - run fsck.\n", *argv);
        memcpy(&osblock, fs, fs->fs_sbsize);
        free(fs);
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