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ovl: store lower path in ovl_inode

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Create some ovl_i_* helpers to get real path from ovl inode. Instead of
just stashing struct inode for the lower layer we stash struct path for
the lower layer. The helpers allow to retrieve a struct path for the
relevant upper or lower layer. This will be used when retrieving
information based on struct inode when copying up inode attributes from
upper or lower inodes to ovl inodes and when checking permissions in
ovl_permission() in following patches. This is needed to support
idmapped base layers with overlay.

Cc: <linux-unionfs@vger.kernel.org>
Tested-by: Giuseppe Scrivano <gscrivan@redhat.com>
Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2022-04-04 12:51:53 +02:00
committed by Miklos Szeredi
parent ba9ea771ec
commit ffa5723c6d
5 changed files with 27 additions and 8 deletions
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15
fs/overlayfs/util.c
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@@ -250,6 +250,17 @@ struct dentry *ovl_i_dentry_upper(struct inode *inode)
return ovl_upperdentry_dereference(OVL_I(inode));
}
void ovl_i_path_real(struct inode *inode, struct path *path)
{
path->dentry = ovl_i_dentry_upper(inode);
if (!path->dentry) {
path->dentry = OVL_I(inode)->lowerpath.dentry;
path->mnt = OVL_I(inode)->lowerpath.layer->mnt;
} else {
path->mnt = ovl_upper_mnt(OVL_FS(inode->i_sb));
}
}
struct inode *ovl_inode_upper(struct inode *inode)
{
struct dentry *upperdentry = ovl_i_dentry_upper(inode);
@@ -259,7 +270,9 @@ struct inode *ovl_inode_upper(struct inode *inode)
struct inode *ovl_inode_lower(struct inode *inode)
{
return OVL_I(inode)->lower;
struct dentry *lowerdentry = OVL_I(inode)->lowerpath.dentry;
return lowerdentry ? d_inode(lowerdentry) : NULL;
}
struct inode *ovl_inode_real(struct inode *inode)