s3: VFS: vfs_snapper. Implement readlinkat().

Currently identical to readlink().

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Böhme <slow@samba.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/source3/modules/vfs_snapper.c b/source3/modules/vfs_snapper.c
index cb451ebdcd2..ce0993806c7 100644
--- a/source3/modules/vfs_snapper.c
+++ b/source3/modules/vfs_snapper.c
@@ -2381,6 +2381,57 @@ static int snapper_gmt_readlink(vfs_handle_struct *handle,
 	return ret;
 }
 
+static int snapper_gmt_readlinkat(vfs_handle_struct *handle,
+				files_struct *dirfsp,
+				const struct smb_filename *smb_fname,
+				char *buf,
+				size_t bufsiz)
+{
+	time_t timestamp = 0;
+	char *stripped = NULL;
+	int ret;
+	int saved_errno = 0;
+	struct smb_filename *conv = NULL;
+
+	if (!snapper_gmt_strip_snapshot(talloc_tos(), handle,
+					smb_fname->base_name,
+					&timestamp, &stripped)) {
+		return -1;
+	}
+	if (timestamp == 0) {
+		return SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				smb_fname,
+				buf,
+				bufsiz);
+	}
+	conv = cp_smb_filename(talloc_tos(), smb_fname);
+	if (conv == NULL) {
+		TALLOC_FREE(stripped);
+		errno = ENOMEM;
+		return -1;
+	}
+	conv->base_name = snapper_gmt_convert(conv, handle,
+					      stripped, timestamp);
+	TALLOC_FREE(stripped);
+	if (conv->base_name == NULL) {
+		return -1;
+	}
+	ret = SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				conv,
+				buf,
+				bufsiz);
+	if (ret == -1) {
+		saved_errno = errno;
+	}
+	TALLOC_FREE(conv);
+	if (saved_errno != 0) {
+		errno = saved_errno;
+	}
+	return ret;
+}
+
 static int snapper_gmt_mknodat(vfs_handle_struct *handle,
 			files_struct *dirfsp,
 			const struct smb_filename *smb_fname,
@@ -2886,6 +2937,7 @@ static struct vfs_fn_pointers snapper_fns = {
 	.chdir_fn = snapper_gmt_chdir,
 	.ntimes_fn = snapper_gmt_ntimes,
 	.readlink_fn = snapper_gmt_readlink,
+	.readlinkat_fn = snapper_gmt_readlinkat,
 	.mknodat_fn = snapper_gmt_mknodat,
 	.realpath_fn = snapper_gmt_realpath,
 	.get_nt_acl_fn = snapper_gmt_get_nt_acl,