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Diffstat (limited to 'drivers/mtd/mtdcore.c')
-rw-r--r--drivers/mtd/mtdcore.c80
1 files changed, 74 insertions, 6 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index c356c0a30c3..b177e750efc 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -2,12 +2,14 @@
* Core registration and callback routines for MTD
* drivers and users.
*
+ * bdi bits are:
+ * Copyright © 2006 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
-#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
@@ -17,11 +19,39 @@
#include <linux/init.h>
#include <linux/mtd/compatmac.h>
#include <linux/proc_fs.h>
+#include <linux/backing-dev.h>
#include <linux/mtd/mtd.h>
-#include "internal.h"
#include "mtdcore.h"
+/*
+ * backing device capabilities for non-mappable devices (such as NAND flash)
+ * - permits private mappings, copies are taken of the data
+ */
+struct backing_dev_info mtd_bdi_unmappable = {
+ .capabilities = BDI_CAP_MAP_COPY,
+};
+
+/*
+ * backing device capabilities for R/O mappable devices (such as ROM)
+ * - permits private mappings, copies are taken of the data
+ * - permits non-writable shared mappings
+ */
+struct backing_dev_info mtd_bdi_ro_mappable = {
+ .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
+ BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP),
+};
+
+/*
+ * backing device capabilities for writable mappable devices (such as RAM)
+ * - permits private mappings, copies are taken of the data
+ * - permits non-writable shared mappings
+ */
+struct backing_dev_info mtd_bdi_rw_mappable = {
+ .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT |
+ BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP |
+ BDI_CAP_WRITE_MAP),
+};
static int mtd_cls_suspend(struct device *dev, pm_message_t state);
static int mtd_cls_resume(struct device *dev);
@@ -629,20 +659,55 @@ done:
/*====================================================================*/
/* Init code */
+static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name)
+{
+ int ret;
+
+ ret = bdi_init(bdi);
+ if (!ret)
+ ret = bdi_register(bdi, NULL, name);
+
+ if (ret)
+ bdi_destroy(bdi);
+
+ return ret;
+}
+
static int __init init_mtd(void)
{
int ret;
+
ret = class_register(&mtd_class);
+ if (ret)
+ goto err_reg;
+
+ ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap");
+ if (ret)
+ goto err_bdi1;
+
+ ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap");
+ if (ret)
+ goto err_bdi2;
+
+ ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap");
+ if (ret)
+ goto err_bdi3;
- if (ret) {
- pr_err("Error registering mtd class: %d\n", ret);
- return ret;
- }
#ifdef CONFIG_PROC_FS
if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
proc_mtd->read_proc = mtd_read_proc;
#endif /* CONFIG_PROC_FS */
return 0;
+
+err_bdi3:
+ bdi_destroy(&mtd_bdi_ro_mappable);
+err_bdi2:
+ bdi_destroy(&mtd_bdi_unmappable);
+err_bdi1:
+ class_unregister(&mtd_class);
+err_reg:
+ pr_err("Error registering mtd class or bdi: %d\n", ret);
+ return ret;
}
static void __exit cleanup_mtd(void)
@@ -652,6 +717,9 @@ static void __exit cleanup_mtd(void)
remove_proc_entry( "mtd", NULL);
#endif /* CONFIG_PROC_FS */
class_unregister(&mtd_class);
+ bdi_destroy(&mtd_bdi_unmappable);
+ bdi_destroy(&mtd_bdi_ro_mappable);
+ bdi_destroy(&mtd_bdi_rw_mappable);
}
module_init(init_mtd);