[PATCH 6/7] add filesystem support over the same USB used for booting
vj
vicencb at gmail.com
Tue Sep 25 18:59:53 EDT 2012
---
fs/Kconfig | 5 ++
fs/Makefile | 1 +
fs/usbbootfs.c | 195 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 201 insertions(+)
create mode 100644 fs/usbbootfs.c
diff --git a/fs/Kconfig b/fs/Kconfig
index 4c66543..1b89aec 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -29,6 +29,11 @@ config FS_TFTP
prompt "tftp support"
depends on NET
+config FS_USBBOOT
+ bool
+ prompt "Filesystem over usb boot"
+ depends on USB_BOOT
+
config FS_NFS
depends on NET
bool
diff --git a/fs/Makefile b/fs/Makefile
index 1b52bee..d4f9a59 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -5,4 +5,5 @@ obj-$(CONFIG_FS_DEVFS) += devfs.o
obj-$(CONFIG_FS_FAT) += fat/
obj-y += fs.o
obj-$(CONFIG_FS_TFTP) += tftp.o
+obj-$(CONFIG_FS_USBBOOT) += usbbootfs.o
obj-$(CONFIG_FS_NFS) += nfs.o
diff --git a/fs/usbbootfs.c b/fs/usbbootfs.c
new file mode 100644
index 0000000..a40abbf
--- /dev/null
+++ b/fs/usbbootfs.c
@@ -0,0 +1,195 @@
+/*
+ * usbbootfs.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <common.h>
+#include <malloc.h>
+#include <fs.h>
+#include <fcntl.h>
+#include <init.h>
+#include <linux/stat.h>
+#include <linux/err.h>
+#include <mach/omap4_rom_usb.h>
+
+#define USBBOOT_FS_MAGIC 0x5562464D
+#define USBBOOT_FS_CMD_OPEN 0x46530000
+#define USBBOOT_FS_CMD_CLOSE 0x46530001
+#define USBBOOT_FS_CMD_READ 0x46530002
+#define USBBOOT_FS_CMD_END 0x4653FFFF
+
+struct file_priv {
+ s32 id;
+ u32 size;
+};
+/*
+static int usbbootfs_create(struct device_d *dev, const char *pathname, mode_t mode){
+ return -ENOSYS;
+}
+
+static int usbbootfs_unlink(struct device_d *dev, const char *pathname){
+ return -ENOSYS;
+}
+
+static int usbbootfs_mkdir(struct device_d *dev, const char *pathname){
+ return -ENOSYS;
+}
+
+static int usbbootfs_rmdir(struct device_d *dev, const char *pathname){
+ return -ENOSYS;
+}
+
+static int usbbootfs_write(struct device_d *_dev, FILE *f, const void *inbuf, size_t size){
+ return -ENOSYS;
+}
+
+static int usbbootfs_truncate(struct device_d *dev, FILE *f, ulong size){
+ return -ENOSYS;
+}
+*/
+
+static struct file_priv *usbbootfs_do_open(struct device_d *dev, int accmode, const char *filename){
+ struct file_priv *priv;
+ u32 data;
+
+ if(accmode & O_ACCMODE)
+ return ERR_PTR(-ENOSYS);
+
+ priv = xzalloc(sizeof(*priv));
+ if(!priv)
+ return ERR_PTR(-ENOMEM);
+
+ data = USBBOOT_FS_MAGIC ; usb_write(&data, 4);
+ data = USBBOOT_FS_CMD_OPEN; usb_write(&data, 4);
+ usb_puts(filename);
+ data = USBBOOT_FS_CMD_END ; usb_write(&data, 4);
+
+ if(usb_read(&priv->id, 4) || usb_read(&priv->size, 4)){
+ free(priv);
+ return ERR_PTR(-EIO);
+ }
+ if(priv->id<0){
+ free(priv);
+ return ERR_PTR(-ENOENT);
+ }
+
+ return priv;
+}
+
+static int usbbootfs_open(struct device_d *dev, FILE *file, const char *filename){
+ struct file_priv *priv;
+
+ priv = usbbootfs_do_open(dev, file->flags, filename);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ file->inode = priv;
+ file->size = priv->size;
+
+ return 0;
+}
+
+static int usbbootfs_do_close(struct file_priv *priv){
+ u32 data;
+ data = USBBOOT_FS_MAGIC ; usb_write(&data, 4);
+ data = USBBOOT_FS_CMD_CLOSE; usb_write(&data, 4);
+ usb_write(&priv->id, 4);
+ data = USBBOOT_FS_CMD_END ; usb_write(&data, 4);
+ free(priv);
+ return 0;
+}
+
+static int usbbootfs_close(struct device_d *dev, FILE *f){
+ struct file_priv *priv = f->inode;
+ return usbbootfs_do_close(priv);
+}
+
+static int usbbootfs_read(struct device_d *dev, FILE *f, void *buf, size_t size){
+ struct file_priv *priv = f->inode;
+ u32 data;
+
+ if( size > priv->size - f->pos)
+ size = priv->size - f->pos;
+ if(!size)
+ return 0;
+
+ data = USBBOOT_FS_MAGIC ; usb_write(&data, 4);
+ data = USBBOOT_FS_CMD_READ; usb_write(&data, 4);
+ usb_write(&priv->id, 4);
+ usb_write(&f->pos, 4);
+ usb_write(&size, 4);
+ data = USBBOOT_FS_CMD_END ; usb_write(&data, 4);
+
+ if(usb_read(buf, size))
+ return -EIO;
+
+ return size;
+}
+
+static loff_t usbbootfs_lseek(struct device_d *dev, FILE *f, loff_t pos){
+ f->pos = pos;
+ return pos;
+}
+
+static DIR* usbbootfs_opendir(struct device_d *dev, const char *pathname){
+ return NULL;
+}
+
+static int usbbootfs_stat(struct device_d *dev, const char *filename, struct stat *s){
+ struct file_priv *priv;
+
+ priv = usbbootfs_do_open(dev, O_RDONLY, filename);
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
+
+ s->st_mode = S_IFREG |
+ S_IRUSR | S_IRGRP | S_IROTH |
+ S_IXUSR | S_IXGRP | S_IXOTH ;
+ s->st_size = priv->size;
+
+ usbbootfs_do_close(priv);
+
+ return 0;
+}
+
+static int usbbootfs_probe(struct device_d *dev){ return 0; }
+static void usbbootfs_remove(struct device_d *dev){}
+
+static struct fs_driver_d usbbootfs_driver = {
+ .open = usbbootfs_open,
+ .close = usbbootfs_close,
+ .read = usbbootfs_read,
+ .lseek = usbbootfs_lseek,
+ .opendir = usbbootfs_opendir,
+ .stat = usbbootfs_stat,
+/*
+ .create = usbbootfs_create,
+ .unlink = usbbootfs_unlink,
+ .mkdir = usbbootfs_mkdir,
+ .rmdir = usbbootfs_rmdir,
+ .write = usbbootfs_write,
+ .truncate = usbbootfs_truncate,
+*/
+ .flags = 0,
+ .drv = {
+ .probe = usbbootfs_probe,
+ .remove = usbbootfs_remove,
+ .name = "usbbootfs",
+ }
+};
+
+static int usbbootfs_init(void){
+ return register_fs_driver(&usbbootfs_driver);
+}
+coredevice_initcall(usbbootfs_init);
--
1.7.12.1
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