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ovl: decode indexed dir file handles

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Decoding an indexed dir file handle is done by looking up the file handle
in index dir by name and then decoding the upper dir from the index origin
file handle. The decoded upper path is used to lookup an overlay dentry of
the same path.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein
2017-12-24 18:42:16 +02:00
committed by Miklos Szeredi
parent 9436a1a339
commit 3b0bfc6ed3
3 changed files with 15 additions and 1 deletions
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13
fs/overlayfs/export.c
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@@ -461,6 +461,19 @@ static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,
}
}
/* Then try to get upper dir by index */
if (index && d_is_dir(index)) {
struct dentry *upper = ovl_index_upper(ofs, index);
err = PTR_ERR(upper);
if (IS_ERR_OR_NULL(upper))
goto out_err;
dentry = ovl_get_dentry(sb, upper, NULL, NULL);
dput(upper);
goto out;
}
/* Then lookup origin by fh */
err = ovl_check_origin_fh(ofs, fh, NULL, &stack);
if (err) {