On Mon 22-03-21 19:39:44, Amir Goldstein wrote: > Since kernel v5.1, fanotify_init(2) supports the flag FAN_REPORT_FID > for identifying objects using file handle and fsid in events. > > fanotify_mark(2) fails with -ENODEV when trying to set a mark on > filesystems that report null f_fsid in stasfs(2). > > Use the digest of uuid as f_fsid for tmpfs to uniquely identify tmpfs > objects as best as possible and allow setting an fanotify mark that > reports events with file handles on tmpfs. > > Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx> Hugh, any opinion on this patch? Honza > --- > mm/shmem.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/mm/shmem.c b/mm/shmem.c > index b2db4ed0fbc7..162d8f8993bb 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -2846,6 +2846,9 @@ static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf) > buf->f_ffree = sbinfo->free_inodes; > } > /* else leave those fields 0 like simple_statfs */ > + > + buf->f_fsid = uuid_to_fsid(dentry->d_sb->s_uuid.b); > + > return 0; > } > > -- > 2.25.1 > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
