From 602051e8eb17ee5fdc54324a1a22f25e947105d8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Duval?= <jerome.duval@gmail.com>
Date: Mon, 9 Nov 2020 11:36:30 +0100
Subject: [PATCH] ext2: implement FIOSEEKDATA and FIOSEEKHOLE ioctl commands

Change-Id: I5f267620e904fe7bb294a4864a8ed017d27a7e68
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3387
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
---
 .../file_systems/ext2/kernel_interface.cpp    | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp b/src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp
index b6773001b8..942cb5f754 100644
--- a/src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp
+++ b/src/add-ons/kernel/file_systems/ext2/kernel_interface.cpp
@@ -7,6 +7,7 @@
 
 #include <algorithm>
 #include <dirent.h>
+#include <sys/ioctl.h>
 #include <util/kernel_cpp.h>
 #include <string.h>
 
@@ -574,6 +575,33 @@ ext2_ioctl(fs_volume* _volume, fs_vnode* _node, void* _cookie, uint32 cmd,
 
 			return B_OK;
 		}
+
+		case FIOSEEKDATA:
+		case FIOSEEKHOLE:
+		{
+			off_t* offset = (off_t*)buffer;
+			Inode* inode = (Inode*)_node->private_node;
+
+			if (*offset >= inode->Size())
+				return ENXIO;
+
+			while (*offset < inode->Size()) {
+				fsblock_t block;
+				uint32 count = 1;
+				status_t status = inode->FindBlock(*offset, block, &count);
+				if (status != B_OK)
+					return status;
+				if ((block != 0 && cmd == FIOSEEKDATA)
+					|| (block == 0 && cmd == FIOSEEKHOLE)) {
+					return B_OK;
+				}
+				*offset += count * volume->BlockSize();
+			}
+
+			if (*offset > inode->Size())
+				*offset = inode->Size();
+			return cmd == FIOSEEKDATA ? ENXIO : B_OK;
+		}
 	}
 
 	return B_DEV_INVALID_IOCTL;