From: Jeremy Allison <jra@samba.org>
Date: Fri, 16 Aug 2019 23:01:22 +0000 (-0700)
Subject: s3: VFS: vfs_snapper. Implement linkat().
X-Git-Tag: tevent-0.10.1~301
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dad377dbe4795f110da35bb751f800d6658fa7c0;p=thirdparty%2Fsamba.git

s3: VFS: vfs_snapper. Implement linkat().

Currently identical to link().

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

diff --git a/source3/modules/vfs_snapper.c b/source3/modules/vfs_snapper.c
index 4975cdf6fb4..910591b1219 100644
--- a/source3/modules/vfs_snapper.c
+++ b/source3/modules/vfs_snapper.c
@@ -2099,6 +2099,42 @@ static int snapper_gmt_link(vfs_handle_struct *handle,
 	return SMB_VFS_NEXT_LINK(handle, old_smb_fname, new_smb_fname);
 }
 
+static int snapper_gmt_linkat(vfs_handle_struct *handle,
+				files_struct *srcfsp,
+				const struct smb_filename *old_smb_fname,
+				files_struct *dstfsp,
+				const struct smb_filename *new_smb_fname,
+				int flags)
+{
+	time_t timestamp_old = 0;
+	time_t timestamp_new = 0;
+
+	if (!snapper_gmt_strip_snapshot(talloc_tos(),
+				handle,
+				old_smb_fname->base_name,
+				&timestamp_old,
+				NULL)) {
+		return -1;
+	}
+	if (!snapper_gmt_strip_snapshot(talloc_tos(),
+				handle,
+				new_smb_fname->base_name,
+				&timestamp_new,
+				NULL)) {
+		return -1;
+	}
+	if ((timestamp_old != 0) || (timestamp_new != 0)) {
+		errno = EROFS;
+		return -1;
+	}
+	return SMB_VFS_NEXT_LINKAT(handle,
+				srcfsp,
+				old_smb_fname,
+				dstfsp,
+				new_smb_fname,
+				flags);
+}
+
 static int snapper_gmt_stat(vfs_handle_struct *handle,
 			    struct smb_filename *smb_fname)
 {
@@ -2863,6 +2899,7 @@ static struct vfs_fn_pointers snapper_fns = {
 	.get_quota_fn = snapper_gmt_get_quota,
 	.renameat_fn = snapper_gmt_renameat,
 	.link_fn = snapper_gmt_link,
+	.linkat_fn = snapper_gmt_linkat,
 	.symlink_fn = snapper_gmt_symlink,
 	.stat_fn = snapper_gmt_stat,
 	.lstat_fn = snapper_gmt_lstat,