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Current code returns EXDEV when a directory would need to be copied up to move. We could copy up the directory tree in this case, but there's another, simpler solution: point to old lower directory from moved upper directory. This is achieved with a "trusted.overlay.redirect" xattr storing the path relative to the root of the overlay. After such attribute has been set, the directory can be moved without further actions required. This is a backward incompatible feature, old kernels won't be able to correctly mount an overlay containing redirected directories. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> |
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.. | ||
copy_up.c | ||
dir.c | ||
inode.c | ||
Kconfig | ||
Makefile | ||
namei.c | ||
overlayfs.h | ||
ovl_entry.h | ||
readdir.c | ||
super.c | ||
util.c |