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ovl: do not get metacopy for userxattr 

When looking up an inode on the lower layer for which the mounter lacks
read permisison the metacopy check will fail.  This causes the lookup to
fail as well, even though the directory is readable.

So ignore EACCES for the "userxattr" case and assume no metacopy for the
unreadable file.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2020-12-14 15:26:14 +01:00
parent b6650dab40
commit 87b2c60c61
1 changed files with 7 additions and 0 deletions
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7
fs/overlayfs/util.c
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@ -884,6 +884,13 @@ int ovl_check_metacopy_xattr(struct ovl_fs *ofs, struct dentry *dentry)
if (res < 0) {
if (res == -ENODATA || res == -EOPNOTSUPP)
return 0;
/*
* getxattr on user.* may fail with EACCES in case there's no
* read permission on the inode. Not much we can do, other than
* tell the caller that this is not a metacopy inode.
*/
if (ofs->config.userxattr && res == -EACCES)
return 0;
goto out;
}