2015-12-03 13:54:33 +00:00
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From 1c8a47df36d72ace8cf78eb6c228aa0f8027d3c2 Mon Sep 17 00:00:00 2001
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From: Miklos Szeredi <miklos@szeredi.hu>
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Date: Mon, 12 Oct 2015 15:56:20 +0200
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Subject: ovl: fix open in stacked overlay
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If two overlayfs filesystems are stacked on top of each other, then we need
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recursion in ovl_d_select_inode().
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I guess d_backing_inode() is supposed to do that. But currently it doesn't
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and that functionality is open coded in vfs_open(). This is now copied
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into ovl_d_select_inode() to fix this regression.
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Reported-by: Alban Crequy <alban.crequy@gmail.com>
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Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
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Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay...")
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Cc: David Howells <dhowells@redhat.com>
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Cc: <stable@vger.kernel.org> # v4.2+
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---
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fs/overlayfs/inode.c | 3 +++
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1 file changed, 3 insertions(+)
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--- a/fs/overlayfs/inode.c
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+++ b/fs/overlayfs/inode.c
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2016-03-18 23:41:21 +00:00
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@@ -375,6 +375,9 @@ struct inode *ovl_d_select_inode(struct
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2015-12-03 13:54:33 +00:00
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ovl_path_upper(dentry, &realpath);
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}
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+ if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE)
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+ return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags);
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+
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return d_backing_inode(realpath.dentry);
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}
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