From: Jeremy Allison <jra@samba.org>
Date: Thu, 22 Aug 2019 21:10:31 +0000 (-0700)
Subject: s3: VFS: vfs_ceph_snapshots. Implement readlinkat().
X-Git-Tag: tevent-0.10.1~182
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b692b2916de1af02ee6f56c194a0436ec0fe01c0;p=thirdparty%2Fsamba.git

s3: VFS: vfs_ceph_snapshots. Implement readlinkat().

Currently identical to readlink().

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

diff --git a/source3/modules/vfs_ceph_snapshots.c b/source3/modules/vfs_ceph_snapshots.c
index ff412ee9a6c..c5dba01b313 100644
--- a/source3/modules/vfs_ceph_snapshots.c
+++ b/source3/modules/vfs_ceph_snapshots.c
@@ -1135,6 +1135,57 @@ static int ceph_snap_gmt_readlink(vfs_handle_struct *handle,
 	return ret;
 }
 
+static int ceph_snap_gmt_readlinkat(vfs_handle_struct *handle,
+				files_struct *dirfsp,
+				const struct smb_filename *csmb_fname,
+				char *buf,
+				size_t bufsiz)
+{
+	time_t timestamp = 0;
+	char stripped[PATH_MAX + 1];
+	char conv[PATH_MAX + 1];
+	int ret;
+	struct smb_filename *new_fname;
+	int saved_errno;
+
+	ret = ceph_snap_gmt_strip_snapshot(handle,
+					csmb_fname->base_name,
+					&timestamp, stripped, sizeof(stripped));
+	if (ret < 0) {
+		errno = -ret;
+		return -1;
+	}
+	if (timestamp == 0) {
+		return SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				csmb_fname,
+				buf,
+				bufsiz);
+	}
+	ret = ceph_snap_gmt_convert(handle, stripped,
+					timestamp, conv, sizeof(conv));
+	if (ret < 0) {
+		errno = -ret;
+		return -1;
+	}
+	new_fname = cp_smb_filename(talloc_tos(), csmb_fname);
+	if (new_fname == NULL) {
+		errno = ENOMEM;
+		return -1;
+	}
+	new_fname->base_name = conv;
+
+	ret = SMB_VFS_NEXT_READLINKAT(handle,
+				dirfsp,
+				new_fname,
+				buf,
+				bufsiz);
+	saved_errno = errno;
+	TALLOC_FREE(new_fname);
+	errno = saved_errno;
+	return ret;
+}
+
 static int ceph_snap_gmt_mknodat(vfs_handle_struct *handle,
 			files_struct *dirfsp,
 			const struct smb_filename *csmb_fname,
@@ -1625,6 +1676,7 @@ static struct vfs_fn_pointers ceph_snap_fns = {
 	.chdir_fn = ceph_snap_gmt_chdir,
 	.ntimes_fn = ceph_snap_gmt_ntimes,
 	.readlink_fn = ceph_snap_gmt_readlink,
+	.readlinkat_fn = ceph_snap_gmt_readlinkat,
 	.mknodat_fn = ceph_snap_gmt_mknodat,
 	.realpath_fn = ceph_snap_gmt_realpath,
 	.get_nt_acl_fn = ceph_snap_gmt_get_nt_acl,