On Mon, 2021-04-19 at 10:32 +0800, xiubli@xxxxxxxxxx wrote: > From: Xiubo Li <xiubli@xxxxxxxxxx> > > Inode number 0x4 is reserved for the lost+found dir, and the app > or test app need to access it. > > URL: https://tracker.ceph.com/issues/50216 > Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> > --- > fs/ceph/super.h | 3 ++- > include/linux/ceph/ceph_fs.h | 7 ++++--- > 2 files changed, 6 insertions(+), 4 deletions(-) > > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index 4808a1458c9b..0f38e6183ff0 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -542,7 +542,8 @@ static inline int ceph_ino_compare(struct inode *inode, void *data) > > > > > static inline bool ceph_vino_is_reserved(const struct ceph_vino vino) > { > - if (vino.ino < CEPH_INO_SYSTEM_BASE && vino.ino != CEPH_INO_ROOT) { > + if (vino.ino < CEPH_INO_SYSTEM_BASE && vino.ino != CEPH_INO_ROOT && > + vino.ino != CEPH_INO_LOST_AND_FOUND ) { > WARN_RATELIMIT(1, "Attempt to access reserved inode number 0x%llx", vino.ino); > return true; > } > diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h > index e41a811026f6..57e5bd63fb7a 100644 > --- a/include/linux/ceph/ceph_fs.h > +++ b/include/linux/ceph/ceph_fs.h > @@ -27,9 +27,10 @@ > #define CEPH_MONC_PROTOCOL 15 /* server/client */ > > > > > > > > > -#define CEPH_INO_ROOT 1 > -#define CEPH_INO_CEPH 2 /* hidden .ceph dir */ > -#define CEPH_INO_DOTDOT 3 /* used by ceph fuse for parent (..) */ > +#define CEPH_INO_ROOT 1 > +#define CEPH_INO_CEPH 2 /* hidden .ceph dir */ > +#define CEPH_INO_DOTDOT 3 /* used by ceph fuse for parent (..) */ > +#define CEPH_INO_LOST_AND_FOUND 4 /* lost+found dir */ > > > > > /* arbitrary limit on max # of monitors (cluster of 3 is typical) */ > #define CEPH_MAX_MON 31 Thanks Xiubo, For some background, apparently cephfs-data-scan can create this directory, and the clients do need access to it. I'll fold this into the original patch that makes these inodes inaccessible (ceph: don't allow access to MDS-private inodes). Cheers! -- Jeff Layton <jlayton@xxxxxxxxxx>
