ovl: re-structure overlay lower layers in-memory
Define new structures to represent overlay instance lower layers and overlay merge dir lower layers to make room for storing more per layer information in-memory. Instead of keeping the fs instance lower layers in an array of struct vfsmount, keep them in an array of new struct ovl_layer, that has a pointer to struct vfsmount. Instead of keeping the dentry lower layers in an array of struct path, keep them in an array of new struct ovl_path, that has a pointer to struct dentry and to struct ovl_layer. Add a small helper to find the fs layer id that correspopnds to a lower struct ovl_path and use it in ovl_lookup(). [amir: split re-structure from anonymous bdev patch] Signed-off-by: NChandan Rajendra <chandan@linux.vnet.ibm.com> Signed-off-by: NAmir Goldstein <amir73il@gmail.com> Signed-off-by: NMiklos Szeredi <mszeredi@redhat.com>
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