gfs2 already has optional persistent uuid. Use that uuid to report f_fsid in statfs(2), same as ext2/ext4/zonefs. This allows gfs2 to be monitored by fanotify filesystem watch. for example, with inotify-tools 4.23.8.0, the following command can be used to watch changes over entire filesystem: fsnotifywatch --filesystem /mnt/gfs2 Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> --- Andreas, I do not have a test setup for gfs2, but this change it quite trivial, so I am posting it only compile tested. There is no need to test fanotify. It enough to test statfs returns a non-zero f_fsid, e.g.: strace -e fstatfs du /mnt/gfs2 Thanks, Amir. fs/gfs2/super.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 02d93da21b2b..ea769af6bb23 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1006,6 +1006,7 @@ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) buf->f_files = sc.sc_dinodes + sc.sc_free; buf->f_ffree = sc.sc_free; buf->f_namelen = GFS2_FNAMESIZE; + buf->f_fsid = uuid_to_fsid(sb->s_uuid.b); return 0; } -- 2.34.1
