254 lines
5.1 KiB
C
254 lines
5.1 KiB
C
#include <common.h>
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#include <fcntl.h>
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#include <fs.h>
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#include <ioctl.h>
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#include "ubi-barebox.h"
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#include "ubi.h"
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struct ubi_volume_cdev_priv {
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struct ubi_device *ubi;
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struct ubi_volume *vol;
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int written;
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};
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static ssize_t ubi_volume_cdev_read(struct cdev *cdev, void *buf, size_t size,
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loff_t offset, unsigned long flags)
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{
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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struct ubi_volume *vol = priv->vol;
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struct ubi_device *ubi = priv->ubi;
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int err, lnum, off, len;
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size_t count_save = size;
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unsigned long long tmp;
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loff_t offp = offset;
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int usable_leb_size = vol->usable_leb_size;
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debug("%s: %zd @ 0x%08llx\n", __func__, size, offset);
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len = size > usable_leb_size ? usable_leb_size : size;
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tmp = offp;
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off = do_div(tmp, usable_leb_size);
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lnum = tmp;
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do {
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if (off + len >= usable_leb_size)
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len = usable_leb_size - off;
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err = ubi_eba_read_leb(ubi, vol, lnum, buf, off, len, 0);
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if (err) {
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printf("read err %x\n", err);
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break;
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}
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off += len;
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if (off == usable_leb_size) {
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lnum += 1;
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off -= usable_leb_size;
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}
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size -= len;
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offp += len;
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buf += len;
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len = size > usable_leb_size ? usable_leb_size : size;
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} while (size);
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return count_save;
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}
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static ssize_t ubi_volume_cdev_write(struct cdev* cdev, const void *buf,
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size_t size, loff_t offset, unsigned long flags)
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{
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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struct ubi_volume *vol = priv->vol;
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struct ubi_device *ubi = priv->ubi;
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int err;
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if (!priv->written) {
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err = ubi_start_update(ubi, vol, vol->used_bytes);
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if (err < 0) {
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printf("Cannot start volume update\n");
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return err;
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}
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}
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err = ubi_more_update_data(ubi, vol, buf, size);
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if (err < 0) {
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printf("Couldnt or partially wrote data \n");
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return err;
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}
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priv->written += size;
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return size;
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}
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static int ubi_volume_cdev_open(struct cdev *cdev, unsigned long flags)
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{
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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priv->written = 0;
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return 0;
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}
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static int ubi_volume_cdev_close(struct cdev *cdev)
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{
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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struct ubi_volume *vol = priv->vol;
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struct ubi_device *ubi = priv->ubi;
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int err;
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if (priv->written) {
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int remaining = vol->usable_leb_size -
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(priv->written % vol->usable_leb_size);
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if (remaining) {
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void *buf = kmalloc(remaining, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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memset(buf, 0xff, remaining);
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err = ubi_more_update_data(ubi, vol, buf, remaining);
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kfree(buf);
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if (err < 0) {
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printf("Couldnt or partially wrote data \n");
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return err;
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}
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}
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err = ubi_finish_update(ubi, vol);
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if (err)
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return err;
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err = ubi_check_volume(ubi, vol->vol_id);
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if (err < 0) {
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printf("check failed: %s\n", strerror(err));
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return err;
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}
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if (err) {
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ubi_warn("volume %d on UBI device %d is corrupted",
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vol->vol_id, ubi->ubi_num);
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vol->corrupted = 1;
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}
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vol->checked = 1;
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}
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return 0;
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}
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static loff_t ubi_volume_cdev_lseek(struct cdev *cdev, loff_t ofs)
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{
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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/* We can only update ubi volumes sequentially */
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if (priv->written)
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return -EINVAL;
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return ofs;
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}
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static struct file_operations ubi_volume_fops = {
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.open = ubi_volume_cdev_open,
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.close = ubi_volume_cdev_close,
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.read = ubi_volume_cdev_read,
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.write = ubi_volume_cdev_write,
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.lseek = ubi_volume_cdev_lseek,
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};
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int ubi_volume_cdev_add(struct ubi_device *ubi, struct ubi_volume *vol)
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{
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struct cdev *cdev = &vol->cdev;
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struct ubi_volume_cdev_priv *priv;
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int ret;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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priv->vol = vol;
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priv->ubi = ubi;
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cdev->ops = &ubi_volume_fops;
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cdev->name = asprintf("ubi%d.%s", ubi->ubi_num, vol->name);
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cdev->priv = priv;
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cdev->size = vol->used_bytes;
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printf("registering %s as /dev/%s\n", vol->name, cdev->name);
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ret = devfs_create(cdev);
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if (ret) {
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kfree(priv);
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free(cdev->name);
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}
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return 0;
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}
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void ubi_volume_cdev_remove(struct ubi_volume *vol)
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{
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struct cdev *cdev = &vol->cdev;
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struct ubi_volume_cdev_priv *priv = cdev->priv;
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devfs_remove(cdev);
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kfree(cdev->name);
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kfree(priv);
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}
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static int ubi_cdev_ioctl(struct cdev *cdev, int cmd, void *buf)
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{
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struct ubi_volume_desc *desc;
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struct ubi_device *ubi = cdev->priv;
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struct ubi_mkvol_req *req = buf;
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switch (cmd) {
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case UBI_IOCRMVOL:
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desc = ubi_open_volume_nm(ubi->ubi_num, req->name,
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UBI_EXCLUSIVE);
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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ubi_remove_volume(desc, 0);
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ubi_close_volume(desc);
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break;
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case UBI_IOCMKVOL:
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if (!req->bytes)
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req->bytes = ubi->avail_pebs * ubi->leb_size;
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return ubi_create_volume(ubi, req);
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};
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return 0;
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}
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static struct file_operations ubi_fops = {
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.ioctl = ubi_cdev_ioctl,
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};
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int ubi_cdev_add(struct ubi_device *ubi)
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{
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struct cdev *cdev = &ubi->cdev;
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int ret;
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cdev->ops = &ubi_fops;
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cdev->name = asprintf("ubi%d", ubi->ubi_num);
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cdev->priv = ubi;
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cdev->size = 0;
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printf("registering /dev/%s\n", cdev->name);
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ret = devfs_create(cdev);
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if (ret)
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kfree(cdev->name);
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return ret;
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}
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void ubi_cdev_remove(struct ubi_device *ubi)
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{
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struct cdev *cdev = &ubi->cdev;
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printf("removing %s\n", cdev->name);
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devfs_remove(cdev);
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kfree(cdev->name);
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}
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