X-Git-Url: https://git.whamcloud.com/?a=blobdiff_plain;f=ldiskfs%2Fkernel_patches%2Fpatches%2Frhel7%2Fext4-lookup-dotdot.patch;fp=ldiskfs%2Fkernel_patches%2Fpatches%2Frhel7%2Fext4-lookup-dotdot.patch;h=f4318c50527e7008f944506aafd0f6bb343e3188;hb=eaf30e35002bf3936cdf7bf83685552d854f0f88;hp=0000000000000000000000000000000000000000;hpb=db47990bbf7c59474f4c5ca28f96fdf424275516;p=fs%2Flustre-release.git

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
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);
+ }
+