LU-15910 llite: enforce ROOT default on subdir mount

[fs/lustre-release.git] / lustre / llite / llite_lib.c

diff --git a/lustre/llite/llite_lib.c b/lustre/llite/llite_lib.c
index 99f436d..d6da421 100644 (file)
--- a/lustre/llite/llite_lib.c
+++ b/lustre/llite/llite_lib.c
@@ -3089,6 +3089,41 @@ void ll_open_cleanup(struct super_block *sb, struct req_capsule *pill)
        EXIT;
 }
 
+/* set filesystem-wide default LMV for subdir mount if it's enabled on ROOT. */
+static int ll_fileset_default_lmv_fixup(struct inode *inode,
+                                       struct lustre_md *md)
+{
+       struct ll_sb_info *sbi = ll_i2sbi(inode);
+       struct ptlrpc_request *req = NULL;
+       union lmv_mds_md *lmm = NULL;
+       int size = 0;
+       int rc;
+
+       LASSERT(is_root_inode(inode));
+       LASSERT(!fid_is_root(&sbi->ll_root_fid));
+       LASSERT(!md->default_lmv);
+
+       rc = ll_dir_get_default_layout(inode, (void **)&lmm, &size, &req,
+                                      OBD_MD_DEFAULT_MEA,
+                                      GET_DEFAULT_LAYOUT_ROOT);
+       if (rc && rc != -ENODATA)
+               GOTO(out, rc);
+
+       rc = 0;
+       if (lmm && size) {
+               rc = md_unpackmd(sbi->ll_md_exp, &md->default_lmv, lmm, size);
+               if (rc < 0)
+                       GOTO(out, rc);
+
+               rc = 0;
+       }
+       EXIT;
+out:
+       if (req)
+               ptlrpc_req_finished(req);
+       return rc;
+}
+
 int ll_prep_inode(struct inode **inode, struct req_capsule *pill,
                  struct super_block *sb, struct lookup_intent *it)
 {
@@ -3112,8 +3147,17 @@ int ll_prep_inode(struct inode **inode, struct req_capsule *pill,
         * ll_update_lsm_md() may change md.
         */
        if (it && (it->it_op & (IT_LOOKUP | IT_GETATTR)) &&
-           S_ISDIR(md.body->mbo_mode) && !md.default_lmv)
-               default_lmv_deleted = true;
+           S_ISDIR(md.body->mbo_mode) && !md.default_lmv) {
+               if (unlikely(*inode && is_root_inode(*inode) &&
+                            !fid_is_root(&sbi->ll_root_fid))) {
+                       rc = ll_fileset_default_lmv_fixup(*inode, &md);
+                       if (rc)
+                               GOTO(out, rc);
+               }
+
+               if (!md.default_lmv)
+                       default_lmv_deleted = true;
+       }
 
        if (*inode) {
                rc = ll_update_inode(*inode, &md);