LU-5022 ldiskfs: enable support for RHEL7

[fs/lustre-release.git] / ldiskfs / kernel_patches / patches / rhel7 / ext4-lookup-dotdot.patch

diff --git a/ldiskfs/kernel_patches/patches/rhel7/ext4-lookup-dotdot.patch b/ldiskfs/kernel_patches/patches/rhel7/ext4-lookup-dotdot.patch
new file mode 100644 (file)
index 0000000..f4318c5
--- /dev/null
+++ b/ldiskfs/kernel_patches/patches/rhel7/ext4-lookup-dotdot.patch
@@ -0,0 +1,37 @@
+Index: linux-3.10.9-200.fc17.x86_64/fs/ext4/namei.c
+===================================================================
+--- linux-3.10.9-200.fc17.x86_64.orig/fs/ext4/namei.c
++++ linux-3.10.9-200.fc17.x86_64/fs/ext4/namei.c
+@@ -1438,6 +1438,32 @@ static struct dentry *ext4_lookup(struct
+                       return ERR_PTR(-EIO);
+               }
+       }
++      /* ".." shouldn't go into dcache to preserve dcache hierarchy
++       * otherwise we'll get parent being a child of actual child.
++       * see bug 10458 for details -bzzz */
++      if (inode && (dentry->d_name.name[0] == '.' && (dentry->d_name.len == 1 ||
++              (dentry->d_name.len == 2 && dentry->d_name.name[1] == '.')))) {
++              struct dentry *goal = NULL;
++
++              /* first, look for an existing dentry - any one is good */
++              goal = d_find_any_alias(inode);
++              if (goal == NULL) {
++                      spin_lock(&dentry->d_lock);
++                      /* there is no alias, we need to make current dentry:
++                       *  a) inaccessible for __d_lookup()
++                       *  b) inaccessible for iopen */
++                      J_ASSERT(hlist_unhashed(&dentry->d_alias));
++                      dentry->d_flags |= DCACHE_NFSFS_RENAMED;
++                      /* this is d_instantiate() ... */
++                      hlist_add_head(&dentry->d_alias, &inode->i_dentry);
++                      dentry->d_inode = inode;
++                      spin_unlock(&dentry->d_lock);
++              }
++              if (goal)
++                      iput(inode);
++              return goal;
++      }
++
+       return d_splice_alias(inode, dentry);
+ }
+