LU-13717 sec: limit hard links to linkEA size for enc files

[fs/lustre-release.git] / lustre / mdd / mdd_dir.c

diff --git a/lustre/mdd/mdd_dir.c b/lustre/mdd/mdd_dir.c
index 0fb1374..451fd1d 100644 (file)
--- a/lustre/mdd/mdd_dir.c
+++ b/lustre/mdd/mdd_dir.c
@@ -1069,6 +1069,8 @@ static int __mdd_links_add(const struct lu_env *env,
                           const struct lu_fid *pfid,
                           int first, int check)
 {
+       /* cattr is set in mdd_link */
+       struct lu_attr *cattr = MDD_ENV_VAR(env, cattr);
        int rc;
 
        if (ldata->ld_leh == NULL) {
@@ -1096,13 +1098,20 @@ static int __mdd_links_add(const struct lu_env *env,
 
                *tfid = *pfid;
                tfid->f_ver = ~0;
-               linkea_add_buf(ldata, lname, tfid);
+               linkea_add_buf(ldata, lname, tfid, false);
        }
 
        if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_MORE2))
-               linkea_add_buf(ldata, lname, pfid);
+               linkea_add_buf(ldata, lname, pfid, false);
 
-       return linkea_add_buf(ldata, lname, pfid);
+       /* For encrypted file, we want to limit number of hard links to what
+        * linkEA can contain. So ask to return error in case of overflow.
+        * Currently linkEA stores 4KiB of links, that is 14 NAME_MAX links,
+        * or 119 16-byte names.
+        */
+       return linkea_add_buf(ldata, lname, pfid,
+                             cattr->la_valid & LA_FLAGS &&
+                             cattr->la_flags & LUSTRE_ENCRYPT_FL);
 }
 
 static int __mdd_links_del(const struct lu_env *env,
@@ -1111,6 +1120,8 @@ static int __mdd_links_del(const struct lu_env *env,
                           const struct lu_name *lname,
                           const struct lu_fid *pfid)
 {
+       /* cattr is set in mdd_link */
+       struct lu_attr *cattr = MDD_ENV_VAR(env, cattr);
        int rc;
 
        if (ldata->ld_leh == NULL) {
@@ -1123,7 +1134,9 @@ static int __mdd_links_del(const struct lu_env *env,
        if (rc)
                return rc;
 
-       linkea_del_buf(ldata, lname);
+       linkea_del_buf(ldata, lname,
+                      cattr->la_valid & LA_FLAGS &&
+                      cattr->la_flags & LUSTRE_ENCRYPT_FL);
        return 0;
 }