From fbb1648d31f5076a57aba95aef91fb26ebc2d100 Mon Sep 17 00:00:00 2001
From: Luis Henriques <lhenriques@suse.de>
Date: Mon, 16 Nov 2020 10:56:00 +0000
Subject: [PATCH] Revert "client: optimize rename operation under different
 quota root"

This reverts commit b8954e5734b3c53f90c47fbdbbbdb8a23747ef07.

The possibility of doing a cross quota realms rename in the kernel client
has been reverted because there was a corner case where it wasn't being
handled correctly:

  mkdir files limit
  truncate files/file -s 10G
  setfattr limit -n ceph.quota.max_bytes -v 1000000
  mv files limit/

The above would succeed because the kernel client won't immediately notify
the MDSs with the new file size when doing a truncate(2), and thus the
quota realms stats won't be updated.

Although the fuse client doesn't have this issue, multi-client scenarios
may be impacted.

URL: https://tracker.ceph.com/issues/48203
Signed-off-by: Luis Henriques <lhenriques@suse.de>
---
 src/client/Client.cc | 69 +++++++-------------------------------------
 1 file changed, 10 insertions(+), 59 deletions(-)

diff --git a/src/client/Client.cc b/src/client/Client.cc
index aaf9db20c35..9b0dd2f069b 100644
--- a/src/client/Client.cc
+++ b/src/client/Client.cc
@@ -13184,6 +13184,15 @@ int Client::_rename(Inode *fromdir, const char *fromname, Inode *todir, const ch
     else
       return -EROFS;
   }
+  if (fromdir != todir) {
+    Inode *fromdir_root =
+      fromdir->quota.is_enable() ? fromdir : get_quota_root(fromdir, perm);
+    Inode *todir_root =
+      todir->quota.is_enable() ? todir : get_quota_root(todir, perm);
+    if (fromdir_root != todir_root) {
+      return -EXDEV;
+    }
+  }
 
   InodeRef target;
   MetaRequest *req = new MetaRequest(op);
@@ -13216,32 +13225,7 @@ int Client::_rename(Inode *fromdir, const char *fromname, Inode *todir, const ch
     req->dentry_unless = CEPH_CAP_FILE_EXCL;
 
     InodeRef oldin, otherin;
-    Inode *fromdir_root = nullptr;
-    Inode *todir_root = nullptr;
-    int mask = 0;
-    bool quota_check = false;
-    if (fromdir != todir) {
-      fromdir_root =
-        fromdir->quota.is_enable() ? fromdir : get_quota_root(fromdir, perm);
-      todir_root =
-        todir->quota.is_enable() ? todir : get_quota_root(todir, perm);
-
-      if (todir_root->quota.is_enable() && fromdir_root != todir_root) {
-        // use CEPH_STAT_RSTAT mask to force send getattr or lookup request 
-        // to auth MDS to get latest rstat for todir_root and source dir 
-        // even if their dentry caches and inode caps are satisfied.
-        res = _getattr(todir_root, CEPH_STAT_RSTAT, perm, true);
-        if (res < 0)
-          goto fail;
-
-        quota_check = true;
-        if (oldde->inode && oldde->inode->is_dir()) {
-          mask |= CEPH_STAT_RSTAT;
-        }
-      }
-    }
-
-    res = _lookup(fromdir, fromname, mask, &oldin, perm);
+    res = _lookup(fromdir, fromname, 0, &oldin, perm);
     if (res < 0)
       goto fail;
 
@@ -13250,39 +13234,6 @@ int Client::_rename(Inode *fromdir, const char *fromname, Inode *todir, const ch
     req->set_old_inode(oldinode);
     req->old_inode_drop = CEPH_CAP_LINK_SHARED;
 
-    if (quota_check) {
-      int64_t old_bytes, old_files;
-      if (oldinode->is_dir()) {
-        old_bytes = oldinode->rstat.rbytes;
-        old_files = oldinode->rstat.rsize();
-      } else {
-        old_bytes = oldinode->size;
-        old_files = 1;
-      }
-
-      bool quota_exceed = false;
-      if (todir_root && todir_root->quota.max_bytes &&
-          (old_bytes + todir_root->rstat.rbytes) >= todir_root->quota.max_bytes) {
-        ldout(cct, 10) << "_rename (" << oldinode->ino << " bytes="
-                       << old_bytes << ") to (" << todir->ino 
-		       << ") will exceed quota on " << *todir_root << dendl;
-        quota_exceed = true;
-      }
-
-      if (todir_root && todir_root->quota.max_files &&
-          (old_files + todir_root->rstat.rsize()) >= todir_root->quota.max_files) {
-        ldout(cct, 10) << "_rename (" << oldinode->ino << " files="
-                       << old_files << ") to (" << todir->ino 
-                       << ") will exceed quota on " << *todir_root << dendl;
-        quota_exceed = true;
-      }
-
-      if (quota_exceed) {
-        res = (oldinode->is_dir()) ? -EXDEV : -EDQUOT;
-        goto fail;
-      }
-    }
-
     res = _lookup(todir, toname, 0, &otherin, perm);
     switch (res) {
     case 0:
-- 
2.39.5