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| author |   Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:56 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2016-12-16 11:02:56 +0100 |
| commit | a6c6065511411c57167a6cdae0c33263fb662b51 (patch) | |
| tree | cd2c7904884c557a0d7d26a88efc737a8885407a /fs/overlayfs/ovl_entry.h | |
| parent | ovl: lookup redirects (diff) | |
| download | linux-dev-a6c6065511411c57167a6cdae0c33263fb662b51.tar.xz linux-dev-a6c6065511411c57167a6cdae0c33263fb662b51.zip | |
ovl: redirect on rename-dir
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>
Diffstat (limited to 'fs/overlayfs/ovl_entry.h')
| -rw-r--r-- | fs/overlayfs/ovl_entry.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h index eb29882b6a54..d14bca1850d9 100644 --- a/fs/overlayfs/ovl_entry.h +++ b/fs/overlayfs/ovl_entry.h @@ -13,6 +13,7 @@ struct ovl_config { char *upperdir; char *workdir; bool default_permissions; + bool redirect_dir; }; /* private information held for overlayfs's superblock */ |