/*
* MTD methods which simply translate the effective address and pass through
-@@ -489,6 +491,148 @@ out_register:
+@@ -489,6 +491,147 @@ out_register:
return slave;
}
+#define ROOTFS_REMOVED_NAME "<removed>"
+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
+{
-+ char buf[512];
-+ struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
++ struct squashfs_super_block sb;
+ int len, ret;
+
-+ ret = master->read(master, offset, sizeof(*sb), &len, buf);
-+ if (ret || (len != sizeof(*sb))) {
++ ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
++ if (ret || (len != sizeof(sb))) {
+ printk(KERN_ALERT "split_squashfs: error occured while reading "
+ "from \"%s\"\n", master->name);
+ return -EINVAL;
+ }
+
-+ if (*((u32 *) buf) != SQUASHFS_MAGIC) {
++ if (sb.s_magic != SQUASHFS_MAGIC) {
+ printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
+ master->name);
+ *split_offset = 0;
+ return 0;
+ }
+
-+ if (sb->bytes_used <= 0) {
++ if (sb.bytes_used <= 0) {
+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
+ master->name);
+ *split_offset = 0;
+ return 0;
+ }
+
-+ len = (u32) sb->bytes_used;
++ len = (u32) sb.bytes_used;
+ len += (offset & 0x000fffff);
+ len += (master->erasesize - 1);
+ len &= ~(master->erasesize - 1);
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
-@@ -502,14 +646,29 @@ int add_mtd_partitions(struct mtd_info *
+@@ -502,14 +645,29 @@ int add_mtd_partitions(struct mtd_info *
{
struct mtd_part *slave;
u_int32_t cur_offset = 0;
cur_offset = slave->offset + slave->mtd.size;
}
-@@ -517,6 +676,32 @@ int add_mtd_partitions(struct mtd_info *
+@@ -517,6 +675,32 @@ int add_mtd_partitions(struct mtd_info *
}
EXPORT_SYMBOL(add_mtd_partitions);
return err;
}
-@@ -210,32 +246,109 @@ static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
+@@ -210,52 +246,29 @@ static int block2mtd_write(struct mtd_in
static void block2mtd_sync(struct mtd_info *mtd)
{
struct block2mtd_dev *dev = mtd->priv;
- sync_blockdev(dev->blkdev);
-+
+- return;
+-}
+-
+-
+-static void block2mtd_free_device(struct block2mtd_dev *dev)
+-{
+- if (!dev)
+- return;
+-
+- kfree(dev->mtd.name);
+
+- if (dev->blkdev) {
+- invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
+- 0, -1);
+- close_bdev_excl(dev->blkdev);
+- }
+ read_lock(&dev->bdev_mutex);
+ if (dev->blkdev)
+ sync_blockdev(dev->blkdev);
+ read_unlock(&dev->bdev_mutex);
-+
- return;
+
+- kfree(dev);
++ return;
}
+-/* FIXME: ensure that mtd->size % erase_size == 0 */
+-static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
+static int _open_bdev(struct block2mtd_dev *dev)
-+{
-+ struct block_device *bdev;
-+
-+ /* Get a handle on the device */
+ {
+ struct block_device *bdev;
+- struct block2mtd_dev *dev;
+- struct mtd_partition *part;
+- char *name;
+-
+- if (!devname)
+- return NULL;
+-
+- dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
+- if (!dev)
+- return NULL;
+
+ /* Get a handle on the device */
+- bdev = open_bdev_excl(devname, O_RDWR, NULL);
+ bdev = open_bdev_excl(dev->devname, O_RDWR, NULL);
-+#ifndef MODULE
-+ if (IS_ERR(bdev)) {
-+
-+ /* We might not have rootfs mounted at this point. Try
-+ to resolve the device name by other means. */
-+
+ #ifndef MODULE
+ if (IS_ERR(bdev)) {
+
+ /* We might not have rootfs mounted at this point. Try
+ to resolve the device name by other means. */
+
+- dev_t devt = name_to_dev_t(devname);
+ dev_t devt = name_to_dev_t(dev->devname);
-+ if (devt) {
-+ bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
-+ }
-+ }
-+#endif
-+
-+ if (IS_ERR(bdev)) {
+ if (devt) {
+ bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
+ }
+@@ -263,17 +276,97 @@ static struct block2mtd_dev *add_device(
+ #endif
+
+ if (IS_ERR(bdev)) {
+- ERROR("error: cannot open device %s", devname);
+- goto devinit_err;
+ ERROR("error: cannot open device %s", dev->devname);
+ return 1;
-+ }
-+ dev->blkdev = bdev;
-+
-+ if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
-+ ERROR("attempting to use an MTD device as a block device");
+ }
+ dev->blkdev = bdev;
+
+ if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
+ ERROR("attempting to use an MTD device as a block device");
+- goto devinit_err;
+ return 1;
-+ }
-+
+ }
+
+ return 0;
+}
+
+ dev->blkdev = NULL;
+}
+
- static void block2mtd_free_device(struct block2mtd_dev *dev)
- {
- if (!dev)
- return;
-
- kfree(dev->mtd.name);
++static void block2mtd_free_device(struct block2mtd_dev *dev)
++{
++ if (!dev)
++ return;
++
++ kfree(dev->mtd.name);
+ _close_bdev(dev);
+ kfree(dev);
+}
+
+ /* get the device number for the whole disk */
+ devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
-
-- if (dev->blkdev) {
-- invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
-- 0, -1);
-- close_bdev_excl(dev->blkdev);
++
+ /* close the old block device */
+ _close_bdev(dev);
+
+ err = -EINVAL;
+ else {
+ err = rescan_partitions(bdev->bd_disk, bdev);
- }
++ }
+ if (bdev)
+ close_bdev_excl(bdev);
-
-- kfree(dev);
--}
++
+ /* try to open the partition block device again */
+ _open_bdev(dev);
+ write_unlock(&dev->bdev_mutex);
-
++
+ return err;
+}
-
- /* FIXME: ensure that mtd->size % erase_size == 0 */
--static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
++
++/* FIXME: ensure that mtd->size % erase_size == 0 */
+static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
- {
-- struct block_device *bdev;
- struct block2mtd_dev *dev;
- struct mtd_partition *part;
- char *name;
-@@ -243,37 +356,17 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size, const cha
- if (!devname)
- return NULL;
-
-- dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
++{
++ struct block2mtd_dev *dev;
++ struct mtd_partition *part;
++ char *name;
++
++ if (!devname)
++ return NULL;
++
+ dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
- if (!dev)
- return NULL;
-
-- /* Get a handle on the device */
-- bdev = open_bdev_excl(devname, O_RDWR, NULL);
--#ifndef MODULE
-- if (IS_ERR(bdev)) {
--
-- /* We might not have rootfs mounted at this point. Try
-- to resolve the device name by other means. */
++ if (!dev)
++ return NULL;
++
+ strcpy(dev->devname, devname);
-
-- dev_t devt = name_to_dev_t(devname);
-- if (devt) {
-- bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
-- }
-- }
--#endif
--
-- if (IS_ERR(bdev)) {
-- ERROR("error: cannot open device %s", devname);
++
+ if (_open_bdev(dev))
- goto devinit_err;
-- }
-- dev->blkdev = bdev;
--
-- if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
-- ERROR("attempting to use an MTD device as a block device");
-- goto devinit_err;
-- }
-
++ goto devinit_err;
++
mutex_init(&dev->write_mutex);
+ rwlock_init(&dev->bdev_mutex);
if (!mtdname)
mtdname = devname;
-@@ -297,6 +408,7 @@ static struct block2mtd_dev *add_device(
+@@ -297,6 +390,7 @@ static struct block2mtd_dev *add_device(
dev->mtd.read = block2mtd_read;
dev->mtd.priv = dev;
dev->mtd.owner = THIS_MODULE;
projects / openwrt.git / blobdiff