LU-12682 llite: fake symlink type of foreign file/dir

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

diff --git a/lustre/llite/namei.c b/lustre/llite/namei.c
index 7311a2f..ac23de7 100644 (file)
--- a/lustre/llite/namei.c
+++ b/lustre/llite/namei.c
@@ -614,6 +614,27 @@ struct dentry *ll_splice_alias(struct inode *inode, struct dentry *de)
        if (rc < 0)
                return ERR_PTR(rc);
        d_add(de, inode);
+
+       /* this needs only to be done for foreign symlink dirs as
+        * DCACHE_SYMLINK_TYPE is already set by d_flags_for_inode()
+        * kernel routine for files with symlink ops (ie, real symlink)
+        */
+       if (inode && S_ISDIR(inode->i_mode) &&
+           ll_sbi_has_foreign_symlink(ll_i2sbi(inode)) &&
+#ifdef HAVE_IOP_GET_LINK
+           inode->i_op->get_link) {
+#else
+           inode->i_op->follow_link) {
+#endif
+               CDEBUG(D_INFO, "%s: inode "DFID": faking foreign dir as a symlink\n",
+                      ll_i2sbi(inode)->ll_fsname, PFID(ll_inode2fid(inode)));
+               spin_lock(&de->d_lock);
+               /* like d_flags_for_inode() already does for files */
+               de->d_flags = (de->d_flags & ~DCACHE_ENTRY_TYPE) |
+                             DCACHE_SYMLINK_TYPE;
+               spin_unlock(&de->d_lock);
+       }
+
        CDEBUG(D_DENTRY, "Add dentry %p inode %p refc %d flags %#x\n",
               de, de->d_inode, ll_d_count(de), de->d_flags);
         return de;
@@ -1195,7 +1216,9 @@ static int ll_atomic_open(struct inode *dir, struct dentry *dentry,
                        }
                }
 
-               if (dentry->d_inode && it_disposition(it, DISP_OPEN_OPEN)) {
+               /* check also if a foreign file is openable */
+               if (dentry->d_inode && it_disposition(it, DISP_OPEN_OPEN) &&
+                   ll_foreign_is_openable(dentry, open_flags)) {
                        /* Open dentry. */
                        if (S_ISFIFO(dentry->d_inode->i_mode)) {
                                /* We cannot call open here as it might
@@ -1681,6 +1704,10 @@ static int ll_rmdir(struct inode *dir, struct dentry *dchild)
        if (unlikely(d_mountpoint(dchild)))
                 RETURN(-EBUSY);
 
+       /* some foreign dir may not be allowed to be removed */
+       if (!ll_foreign_is_removable(dchild, false))
+               RETURN(-EPERM);
+
        op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len,
                                     S_IFDIR, LUSTRE_OPC_ANY, NULL);
        if (IS_ERR(op_data))
@@ -1766,6 +1793,10 @@ static int ll_unlink(struct inode *dir, struct dentry *dchild)
        if (unlikely(d_mountpoint(dchild)))
                RETURN(-EBUSY);
 
+       /* some foreign file/dir may not be allowed to be unlinked */
+       if (!ll_foreign_is_removable(dchild, false))
+               RETURN(-EPERM);
+
        op_data = ll_prep_md_op_data(NULL, dir, NULL, name->name, name->len, 0,
                                     LUSTRE_OPC_ANY, NULL);
        if (IS_ERR(op_data))