Add dynamic VMM Driven/Guest Driven mode switch in VNET devices

[palacios.git] / palacios / src / devices / filedisk.c

diff --git a/palacios/src/devices/filedisk.c b/palacios/src/devices/filedisk.c
index 44ec18c..b007ace 100644 (file)
--- a/palacios/src/devices/filedisk.c
+++ b/palacios/src/devices/filedisk.c
@@ -41,7 +41,7 @@ static int write_all(v3_file_t fd, char * buf, int offset, int length) {
     
     PrintDebug("Writing %d bytes\n", length - bytes_written);
     while (bytes_written < length) {
-       int tmp_bytes = v3_file_write(fd, buf + bytes_written, offset + bytes_written, length - bytes_written);
+       int tmp_bytes = v3_file_write(fd, buf + bytes_written, length - bytes_written, offset + bytes_written);
        PrintDebug("Wrote %d bytes\n", tmp_bytes);
        
        if (tmp_bytes <= 0 ) {
@@ -61,7 +61,7 @@ static int read_all(v3_file_t fd, char * buf, int offset, int length) {
     
     PrintDebug("Reading %d bytes\n", length - bytes_read);
     while (bytes_read < length) {
-       int tmp_bytes = v3_file_read(fd, buf + bytes_read, offset + bytes_read, length - bytes_read);
+       int tmp_bytes = v3_file_read(fd, buf + bytes_read, length - bytes_read, offset + bytes_read);
        PrintDebug("Read %d bytes\n", tmp_bytes);
        
        if (tmp_bytes <= 0) {
@@ -111,15 +111,15 @@ static struct v3_dev_blk_ops blk_ops = {
 
 
 
-static int disk_free(struct vm_device * dev) {
+static int disk_free(struct disk_state * disk) {
+    v3_file_close(disk->fd);
+    
+    V3_Free(disk);
     return 0;
 }
 
 static struct v3_device_ops dev_ops = {
-    .free = disk_free,
-    .reset = NULL,
-    .start = NULL,
-    .stop = NULL,
+    .free = (int (*)(void *))disk_free,
 };
 
 
@@ -129,58 +129,57 @@ static int disk_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
     struct disk_state * disk = NULL;
     char * path = v3_cfg_val(cfg, "path");
     char * dev_id = v3_cfg_val(cfg, "ID");
-
     char * writable = v3_cfg_val(cfg, "writable");
-    char * readable = v3_cfg_val(cfg, "readable");
-    
-    int allowWrite = ( writable && writable[0] == '1' );
-    int allowRead = ( !readable || readable[0] == '1' );
-
     v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
+    int flags = FILE_OPEN_MODE_READ;
 
-    disk = (struct disk_state *)V3_Malloc(sizeof(struct disk_state));
-    memset(disk, 0, sizeof(struct disk_state));
-
+    if ( (writable) && (writable[0] == '1') ) {
+       flags |= FILE_OPEN_MODE_WRITE;
+    }
 
     if (path == NULL) {
        PrintError("Missing path (%s) for %s\n", path, dev_id);
        return -1;
-
     }
-    
-    if ( (allowRead == 1) && (allowWrite == 1) ) {
-       disk->fd = v3_file_open(vm, path, FILE_OPEN_MODE_READ | FILE_OPEN_MODE_WRITE );
-    } else if ( (allowRead == 1) && (allowWrite == 0) ) {
-       disk->fd = v3_file_open(vm, path, FILE_OPEN_MODE_READ);
-    } else if ( (allowRead == 0) && (allowWrite == 1) ) {
-       disk->fd = v3_file_open(vm, path, FILE_OPEN_MODE_WRITE);
-    } else {
-       PrintError("Error on %s: No file mode specified\n", dev_id );
-       return -1;
 
-    }
-    
-    disk->capacity = v3_file_size(disk->fd);
+    disk = (struct disk_state *)V3_Malloc(sizeof(struct disk_state));
 
-    PrintDebug("Registering FILEDISK %s (path=%s, fd=%lu, size=%lu)\n",
-              dev_id, path, file->fd, file->capacity);
+    if (disk == NULL) {
+       PrintError("Could not allocate disk\n");
+       return -1;
+    }
 
-    struct vm_device * dev = v3_allocate_device(dev_id, &dev_ops, disk);
+    memset(disk, 0, sizeof(struct disk_state));
 
-    if (v3_attach_device(vm, dev) == -1) {
+    struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, disk);
 
+    if (dev == NULL) {
        PrintError("Could not attach device %s\n", dev_id);
+       V3_Free(disk);
        return -1;
+    }
 
+
+    disk->fd = v3_file_open(vm, path, flags);
+
+    if (disk->fd == NULL) {
+       PrintError("Could not open file disk:%s\n", path);
+       v3_remove_device(dev);
+       return -1;
     }
 
+    disk->capacity = v3_file_size(disk->fd);
+
+    PrintDebug("Registering FILEDISK %s (path=%s, fd=%lu, size=%lu)\n",
+              dev_id, path, file->fd, file->capacity);
+
+
     if (v3_dev_connect_blk(vm, v3_cfg_val(frontend_cfg, "tag"), 
                           &blk_ops, frontend_cfg, disk) == -1) {
-
        PrintError("Could not connect %s to frontend %s\n", 
                   dev_id, v3_cfg_val(frontend_cfg, "tag"));
+       v3_remove_device(dev);
        return -1;
-
     }