LU-11999 dne: performance improvement for file creation

[fs/lustre-release.git] / lustre / mdt / mdt_handler.c

diff --git a/lustre/mdt/mdt_handler.c b/lustre/mdt/mdt_handler.c
index 4caa22a..38f58ae 100644 (file)
--- a/lustre/mdt/mdt_handler.c
+++ b/lustre/mdt/mdt_handler.c
@@ -1652,12 +1652,15 @@ static int mdt_getattr_name_lock(struct mdt_thread_info *info,
                        mdt_lock_reg_init(lhc, LCK_PR);
 
                        /*
-                        * Object's name is on another MDS, no lookup or layout
-                        * lock is needed here but update lock is.
+                        * Object's name entry is on another MDS, it will
+                        * request PERM lock only because LOOKUP lock is owned
+                        * by the MDS where name entry resides.
+                        *
+                        * TODO: it should try layout lock too. - Jinshan
                         */
                        child_bits &= ~(MDS_INODELOCK_LOOKUP |
                                        MDS_INODELOCK_LAYOUT);
-                       child_bits |= MDS_INODELOCK_PERM | MDS_INODELOCK_UPDATE;
+                       child_bits |= MDS_INODELOCK_PERM;
 
                        rc = mdt_object_lock(info, child, lhc, child_bits);
                        if (rc < 0)