From: Jeremy Allison <jra@samba.org>
Date: Fri, 16 Aug 2019 22:59:27 +0000 (-0700)
Subject: s3: VFS: vfs_shadow_copy2. Implement linkat().
X-Git-Tag: tevent-0.10.1~302
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c55b43ba13a162d07befc27361632cdf2ef8aeb2;p=thirdparty%2Fsamba.git

s3: VFS: vfs_shadow_copy2. 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_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
index 5d57b9c0229..84fe49bdcb9 100644
--- a/source3/modules/vfs_shadow_copy2.c
+++ b/source3/modules/vfs_shadow_copy2.c
@@ -1267,6 +1267,55 @@ static int shadow_copy2_link(vfs_handle_struct *handle,
 	return SMB_VFS_NEXT_LINK(handle, old_smb_fname, new_smb_fname);
 }
 
+static int shadow_copy2_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;
+	char *snappath_old = NULL;
+	char *snappath_new = NULL;
+
+	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
+				handle,
+				old_smb_fname->base_name,
+				&timestamp_old,
+				NULL,
+				&snappath_old,
+				NULL)) {
+		return -1;
+	}
+	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
+				handle,
+				new_smb_fname->base_name,
+				&timestamp_new,
+				NULL,
+				&snappath_new,
+				NULL)) {
+		return -1;
+	}
+	if ((timestamp_old != 0) || (timestamp_new != 0)) {
+		errno = EROFS;
+		return -1;
+	}
+	/*
+	 * Don't allow links on already converted paths.
+	 */
+	if ((snappath_old != NULL) || (snappath_new != NULL)) {
+		errno = EROFS;
+		return -1;
+	}
+	return SMB_VFS_NEXT_LINKAT(handle,
+			srcfsp,
+			old_smb_fname,
+			dstfsp,
+			new_smb_fname,
+			flags);
+}
+
 static int shadow_copy2_stat(vfs_handle_struct *handle,
 			     struct smb_filename *smb_fname)
 {
@@ -3131,6 +3180,7 @@ static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
 	.get_quota_fn = shadow_copy2_get_quota,
 	.renameat_fn = shadow_copy2_renameat,
 	.link_fn = shadow_copy2_link,
+	.linkat_fn = shadow_copy2_linkat,
 	.symlink_fn = shadow_copy2_symlink,
 	.stat_fn = shadow_copy2_stat,
 	.lstat_fn = shadow_copy2_lstat,