From: Jack Lange <jarusl@cs.northwestern.edu>
Date: Wed, 6 Oct 2010 17:36:15 +0000 (-0500)
Subject: Functional file backend
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=0e29a343765b225251f5634fb34aa6a60085a0bd;p=palacios.git

Functional file backend

Conflicts:

	palacios/src/devices/filedisk.c
---

diff --git a/palacios/src/devices/filedisk.c b/palacios/src/devices/filedisk.c
index 6e9e5d7..278b234 100644
--- a/palacios/src/devices/filedisk.c
+++ b/palacios/src/devices/filedisk.c
@@ -34,14 +34,52 @@ struct disk_state {
 };
 
 
+
+static int write_all(int fd, char * buf, int offset, int length) {
+    int bytes_written = 0;
+    
+    PrintDebug("Writing %d bytes\n", length - bytes_written);
+    while (bytes_written < length) {
+	int tmp_bytes = V3_FileWrite(fd, offset+bytes_written, buf + bytes_written, length - bytes_written);
+	PrintDebug("Wrote %d bytes\n", tmp_bytes);
+	
+	if (tmp_bytes <= 0 ) {
+	    PrintError("Write failed\n");
+	    return -1;
+	}
+	
+	bytes_written += tmp_bytes;
+    }
+    
+    return 0;
+}
+
+
+static int read_all(int fd, char * buf, int offset, int length) {
+    int bytes_read = 0;
+    
+    PrintDebug("Reading %d bytes\n", length - bytes_read);
+    while (bytes_read < length) {
+	int tmp_bytes = V3_FileRead(fd, offset+bytes_read, buf + bytes_read, length - bytes_read);
+	PrintDebug("Read %d bytes\n", tmp_bytes);
+	
+	if (tmp_bytes <= 0) {
+	    PrintError("Read failed\n");
+	    return -1;
+	}
+	
+	bytes_read += tmp_bytes;
+    }
+    
+    return 0;
+}
+
 static int read(uint8_t * buf, uint64_t lba, uint64_t num_bytes, void * private_data) {
     struct disk_state * disk = (struct disk_state *)private_data;
 
     PrintDebug("Reading %d bytes from %p to %p\n", (uint32_t)num_bytes, (uint8_t *)(disk->disk_image + lba), buf);
 
-    V3_FileRead(disk->fd, lba, buf, num_bytes);
-
-    return 0;
+    return read_all(disk->fd, buf, lba, num_bytes);
 }
 
 
@@ -50,9 +88,7 @@ static int write(uint8_t * buf, uint64_t lba, uint64_t num_bytes, void * private
 
     PrintDebug("Writing %d bytes from %p to %p\n", (uint32_t)num_bytes,  buf, (uint8_t *)(disk->disk_image + lba));
 
-    V3_FileWrite(disk->fd, lba, buf, num_bytes);
-
-    return 0;
+    return write_all(disk->fd,  buf, lba, num_bytes);
 }
 
 
@@ -102,6 +138,7 @@ static int disk_init(struct guest_info * vm, v3_cfg_tree_t * cfg) {
 
 
     if (!path) {
+
 	PrintError("Missing path (%s) for %s\n", path, dev_id);
 	return -1;
     }
@@ -109,8 +146,8 @@ static int disk_init(struct guest_info * vm, v3_cfg_tree_t * cfg) {
     disk->fd = V3_FileOpen(path, 0);
     disk->capacity = V3_FileSize(disk->fd);
 
-    PrintDebug("Registering RAMDISK at %p (size=%d)\n", 
-	       (void *)file->data, (uint32_t)file->size);
+    PrintDebug("Registering FILEDISK %s (path=%s, fd=%lu, size=%lu)\n",
+	       name, path, file->fd, file->capacity);
 
     struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, disk);