From 679330e4a7af1d102d035b13b2b9d41bc1dfbbf7 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jo=C3=A3o=20Paredes?= Date: Mon, 2 Mar 2026 02:55:39 +0000 Subject: [PATCH] JFS: always load filesystem UUID during mount MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The filesystem UUID was only being loaded into super_block sb when an external journal device was in use. When mounting without an external journal, the UUID remained unset, which prevented the computation of a filesystem ID (fsid), which could be confirmed via `stat -f -c "%i"` and thus user space could not use fanotify correctly. A missing filesystem ID causes fanotify to return ENODEV when marking the filesystem for events like FAN_CREATE, FAN_DELETE, FAN_MOVED_TO, and FAN_MOVED_FROM. As a result, applications relying on fanotify could not monitor these events on JFS filesystems without an external journal. Moved the UUID initialization so it is always performed during mount, ensuring the superblock UUID is consistently available. Signed-off-by: João Paredes Signed-off-by: Dave Kleikamp --- fs/jfs/jfs_mount.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c index 52e6b58c5dbd2..dac822f150701 100644 --- a/fs/jfs/jfs_mount.c +++ b/fs/jfs/jfs_mount.c @@ -378,11 +378,12 @@ static int chkSuper(struct super_block *sb) sbi->nbperpage = PSIZE >> sbi->l2bsize; sbi->l2nbperpage = L2PSIZE - sbi->l2bsize; sbi->l2niperblk = sbi->l2bsize - L2DISIZE; + uuid_copy(&sbi->uuid, &j_sb->s_uuid); + if (sbi->mntflag & JFS_INLINELOG) sbi->logpxd = j_sb->s_logpxd; else { sbi->logdev = new_decode_dev(le32_to_cpu(j_sb->s_logdev)); - uuid_copy(&sbi->uuid, &j_sb->s_uuid); uuid_copy(&sbi->loguuid, &j_sb->s_loguuid); } sbi->fsckpxd = j_sb->s_fsckpxd; -- 2.47.3