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path: root/docs/hazmat/backends/index.rst
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.. hazmat::

Backends
========

Getting a backend
-----------------

.. currentmodule:: cryptography.hazmat.backends

``cryptography`` aims to support multiple backends to ensure it can provide
the widest number of supported cryptographic algorithms as well as supporting
platform specific implementations.

You can get the default backend by calling :func:`~default_backend`.

The default backend will change over time as we implement new backends and
the libraries we use in those backends changes.


.. function:: default_backend()

    :returns: An object that provides at least
        :class:`~interfaces.CipherBackend`, :class:`~interfaces.HashBackend`, and
        :class:`~interfaces.HMACBackend`.

Individual backends
-------------------

.. toctree::
    :maxdepth: 1

    openssl
    commoncrypto
    multibackend
    interfaces
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-16 14:05:23 +0000
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--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -14,6 +14,7 @@
 #include <linux/list.h>
 #include <linux/init.h>
 #include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
 #include <linux/buffer_head.h>
 #include <linux/mutex.h>
 #include <linux/mount.h>
@@ -233,10 +234,11 @@ static void block2mtd_free_device(struct
 
 
 /* FIXME: ensure that mtd->size % erase_size == 0 */
-static struct block2mtd_dev *add_device(char *devname, int erase_size)
+static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
 {
 	struct block_device *bdev;
 	struct block2mtd_dev *dev;
+	struct mtd_partition *part;
 	char *name;
 
 	if (!devname)
@@ -276,13 +278,16 @@ static struct block2mtd_dev *add_device(
 
 	/* Setup the MTD structure */
 	/* make the name contain the block device in */
-	name = kasprintf(GFP_KERNEL, "block2mtd: %s", devname);
+	if (!mtdname)
+		mtdname = devname;
+	name = kmalloc(strlen(mtdname) + 1, GFP_KERNEL);
 	if (!name)
 		goto devinit_err;
 
+	strcpy(name, mtdname);
 	dev->mtd.name = name;
 
-	dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
+	dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK & ~(erase_size - 1);
 	dev->mtd.erasesize = erase_size;
 	dev->mtd.writesize = 1;
 	dev->mtd.type = MTD_RAM;
@@ -295,14 +300,17 @@ static struct block2mtd_dev *add_device(
 	dev->mtd.priv = dev;
 	dev->mtd.owner = THIS_MODULE;
 
-	if (add_mtd_device(&dev->mtd)) {
+	part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
+	part->name = dev->mtd.name;
+	part->offset = 0;
+	part->size = dev->mtd.size;
+	if (add_mtd_partitions(&dev->mtd, part, 1)) {
 		/* Device didnt get added, so free the entry */
 		goto devinit_err;
 	}
 	list_add(&dev->list, &blkmtd_device_list);
 	INFO("mtd%d: [%s] erase_size = %dKiB [%d]", dev->mtd.index,
-			dev->mtd.name + strlen("block2mtd: "),
-			dev->mtd.erasesize >> 10, dev->mtd.erasesize);
+			mtdname, dev->mtd.erasesize >> 10, dev->mtd.erasesize);
 	return dev;
 
 devinit_err:
@@ -375,9 +383,9 @@ static char block2mtd_paramline[80 + 12]
 
 static int block2mtd_setup2(const char *val)
 {
-	char buf[80 + 12]; /* 80 for device, 12 for erase size */
+	char buf[80 + 12 + 80]; /* 80 for device, 12 for erase size, 80 for name */
 	char *str = buf;
-	char *token[2];
+	char *token[3];
 	char *name;
 	size_t erase_size = PAGE_SIZE;
 	int i, ret;
@@ -388,7 +396,7 @@ static int block2mtd_setup2(const char *
 	strcpy(str, val);
 	kill_final_newline(str);
 
-	for (i = 0; i < 2; i++)
+	for (i = 0; i < 3; i++)
 		token[i] = strsep(&str, ",");
 
 	if (str)
@@ -407,8 +415,10 @@ static int block2mtd_setup2(const char *
 			parse_err("illegal erase size");
 		}
 	}
+	if (token[2] && (strlen(token[2]) + 1 > 80))
+		parse_err("mtd device name too long");
 
-	add_device(name, erase_size);
+	add_device(name, erase_size, token[2]);
 
 	return 0;
 }
@@ -442,7 +452,7 @@ static int block2mtd_setup(const char *v
 
 
 module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
-MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
+MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>[,<name>]]\"");
 
 static int __init block2mtd_init(void)
 {
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -677,6 +677,7 @@ rescan:
 	kfree(state);
 	return 0;
 }
+EXPORT_SYMBOL(rescan_partitions);
 
 unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
 {
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-16 14:05:23 +0000