| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.2 085/110] ovl: fix open in stacked overlay | Date | Fri, 6 Nov 2015 11:19:32 -0800 |
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4.2-stable review patch. If anyone has any objections, please let me know.
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From: Miklos Szeredi <miklos@szeredi.hu>
commit 1c8a47df36d72ace8cf78eb6c228aa0f8027d3c2 upstream.
If two overlayfs filesystems are stacked on top of each other, then we need recursion in ovl_d_select_inode().
I guess d_backing_inode() is supposed to do that. But currently it doesn't and that functionality is open coded in vfs_open(). This is now copied into ovl_d_select_inode() to fix this regression.
Reported-by: Alban Crequy <alban.crequy@gmail.com> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay...") Cc: David Howells <dhowells@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/overlayfs/inode.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -363,6 +363,9 @@ struct inode *ovl_d_select_inode(struct ovl_path_upper(dentry, &realpath); } + if (realpath.dentry->d_flags & DCACHE_OP_SELECT_INODE) + return realpath.dentry->d_op->d_select_inode(realpath.dentry, file_flags); + return d_backing_inode(realpath.dentry); }
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