diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2023-04-27 12:48:46 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-06-19 14:01:13 +0300 |
| commit | 37ebf056d6cfc6638c821386bc33a9602bbc0d28 (patch) | |
| tree | 6afbbc69d724e289a11e7985c3d991986810ccb5 /fs/overlayfs/namei.c | |
| parent | 9e88f9052415289f2789abb6ae68a40a4701b8e1 (diff) | |
ovl: introduce data-only lower layers
Introduce the format lowerdir=lower1:lower2::lowerdata1::lowerdata2
where the lower layers on the right of the :: separators are not merged
into the overlayfs merge dirs.
Data-only lower layers are only allowed at the bottom of the stack.
The files in those layers are only meant to be accessible via absolute
redirect from metacopy files in lower layers. Following changes will
implement lookup in the data layers.
This feature was requested for composefs ostree use case, where the
lower data layer should only be accessiable via absolute redirects
from metacopy inodes.
The lower data layers are not required to a have a unique uuid or any
uuid at all, because they are never used to compose the overlayfs inode
st_ino/st_dev.
Reviewed-by: Alexander Larsson <alexl@redhat.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/namei.c')
| -rw-r--r-- | fs/overlayfs/namei.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c index 8ea2a8358a92..5c1b0397c8ce 100644 --- a/fs/overlayfs/namei.c +++ b/fs/overlayfs/namei.c @@ -356,7 +356,7 @@ int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected, struct dentry *origin = NULL; int i; - for (i = 1; i < ofs->numlayer; i++) { + for (i = 1; i <= ovl_numlowerlayer(ofs); i++) { /* * If lower fs uuid is not unique among lower fs we cannot match * fh->uuid to layer. |