On Wed, Dec 20, 2017 at 11:18 PM, Luis Henriques <lhenriques@xxxxxxxx> wrote: > This patch changes ceph_rename so that -EXDEV is returned if an attempt is > made to mv a file between two different dir trees with different quotas > setup. > > Link: http://tracker.ceph.com/issues/22372 > Signed-off-by: Luis Henriques <lhenriques@xxxxxxxx> > --- > fs/ceph/dir.c | 5 +++++ > fs/ceph/quota.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > fs/ceph/super.h | 1 + > 3 files changed, 64 insertions(+) > > diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c > index 66550d92b1ac..f6ac16caa1e9 100644 > --- a/fs/ceph/dir.c > +++ b/fs/ceph/dir.c > @@ -1090,6 +1090,11 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, > else > return -EROFS; > } > + /* don't allow cross-quota renames */ > + if ((old_dir != new_dir) && > + (!ceph_quota_is_same_realm(old_dir, new_dir))) > + return -EXDEV; > + > dout("rename dir %p dentry %p to dir %p dentry %p\n", > old_dir, old_dentry, new_dir, new_dentry); > req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); > diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c > index 06b3268f8f7f..14e372deb633 100644 > --- a/fs/ceph/quota.c > +++ b/fs/ceph/quota.c > @@ -20,6 +20,11 @@ > #include "super.h" > #include "mds_client.h" > > +static inline bool ceph_has_quota(struct ceph_inode_info *ci) > +{ > + return (ci && (ci->i_max_files || ci->i_max_bytes)); > +} > + > void ceph_handle_quota(struct ceph_mds_client *mdsc, > struct ceph_mds_session *session, > struct ceph_msg *msg) > @@ -62,6 +67,59 @@ void ceph_handle_quota(struct ceph_mds_client *mdsc, > iput(inode); > } > > +/* > + * This function walks through the snaprealm for an inode and returns the > + * ceph_inode_info for the first snaprealm that has quotas set (either max_files > + * or max_bytes). If the root is reached, return the root ceph_inode_info > + * instead. > + */ > +static struct ceph_inode_info *get_quota_realm(struct ceph_mds_client *mdsc, > + struct inode *inode) > +{ > + struct ceph_inode_info *ci = NULL; > + struct ceph_snap_realm *realm, *next; > + struct ceph_vino vino; > + struct inode *ino; In ceph code, 'ino' is usually acronym for inode number. it's better to use name 'in' > + > + realm = ceph_inode(inode)->i_snap_realm; > + ceph_get_snap_realm(mdsc, realm); > + while (realm) { > + vino.ino = realm->ino; > + vino.snap = CEPH_NOSNAP; > + ino = ceph_find_inode(inode->i_sb, vino); > + if (!ino) { > + pr_warn("Failed to find inode for %llu\n", vino.ino); > + break; > + } > + ci = ceph_inode(ino); > + if (ceph_has_quota(ci) || (ci->i_vino.ino == CEPH_INO_ROOT)) { > + iput(ino); > + break; > + } > + iput(ino); > + next = realm->parent; > + ceph_get_snap_realm(mdsc, next); > + ceph_put_snap_realm(mdsc, realm); > + realm = next; > + } > + ceph_put_snap_realm(mdsc, realm); > + > + return ci; I think it's better to return realm, and let caller call ceph_put_snap_realm > +} > + > +bool ceph_quota_is_same_realm(struct inode *old, struct inode *new) > +{ > + struct ceph_mds_client *mdsc = ceph_inode_to_client(old)->mdsc; > + struct ceph_inode_info *ci_old, *ci_new; > + > + down_read(&mdsc->snap_rwsem); > + ci_old = get_quota_realm(mdsc, old); > + ci_new = get_quota_realm(mdsc, new); > + up_read(&mdsc->snap_rwsem); > + > + return (ci_old == ci_new); > +} > + > enum quota_check_op { > QUOTA_CHECK_MAX_FILES_OP /* check quota max_files limit */ > }; > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index 20197e29a7f0..a66e73338386 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -1027,5 +1027,6 @@ extern void ceph_handle_quota(struct ceph_mds_client *mdsc, > struct ceph_mds_session *session, > struct ceph_msg *msg); > extern bool ceph_quota_is_max_files_exceeded(struct inode *inode); > +extern bool ceph_quota_is_same_realm(struct inode *old, struct inode *new); > > #endif /* _FS_CEPH_SUPER_H */ > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
