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openwrt/target/linux/generic-2.6/patches/205-block2mtd_fix.patch

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diff -urN linux.old/drivers/mtd/devices/block2mtd.c linux.dev/drivers/mtd/devices/block2mtd.c
--- linux.old/drivers/mtd/devices/block2mtd.c 2006-07-29 19:53:54.000000000 +0200
+++ linux.dev/drivers/mtd/devices/block2mtd.c 2006-07-29 19:47:03.000000000 +0200
@@ -4,11 +4,10 @@
* block2mtd.c - create an mtd from a block device
*
* Copyright (C) 2001,2002 Simon Evans <spse@secret.org.uk>
- * Copyright (C) 2004,2005 Jörn Engel <joern@wh.fh-wedel.de>
+ * Copyright (C) 2004-2006 Jörn Engel <joern@wh.fh-wedel.de>
*
* Licence: GPL
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
@@ -19,6 +18,7 @@ #include <linux/init.h>
#include <linux/mtd/mtd.h>
#include <linux/buffer_head.h>
#include <linux/mutex.h>
+#include <linux/mount.h>
#define VERSION "$Revision: 1.30 $"
@@ -62,10 +61,8 @@
read_lock_irq(&mapping->tree_lock);
for (i = 0; i < PAGE_READAHEAD; i++) {
pagei = index + i;
- if (pagei > end_index) {
- INFO("Overrun end of disk in cache readahead\n");
+ if (pagei > end_index)
break;
- }
page = radix_tree_lookup(&mapping->page_tree, pagei);
if (page && (!i))
break;
@@ -237,6 +237,8 @@ static int _block2mtd_write(struct block
}
return 0;
}
+
+
static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
@@ -300,6 +302,19 @@ static struct block2mtd_dev *add_device(
/* 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. */
+
+ dev_t dev = name_to_dev_t(devname);
+ if (dev != 0) {
+ bdev = open_by_devnum(dev, FMODE_WRITE | FMODE_READ);
+ }
+ }
+#endif
+
if (IS_ERR(bdev)) {
ERROR("error: cannot open device %s", devname);
goto devinit_err;
@@ -331,7 +347,6 @@ static struct block2mtd_dev *add_device(
dev->mtd.writev = default_mtd_writev;
dev->mtd.sync = block2mtd_sync;
dev->mtd.read = block2mtd_read;
- dev->mtd.readv = default_mtd_readv;
dev->mtd.priv = dev;
dev->mtd.owner = THIS_MODULE;
@@ -351,6 +366,12 @@ devinit_err:
}
+/* This function works similar to reguler strtoul. In addition, it
+ * allows some suffixes for a more human-readable number format:
+ * ki, Ki, kiB, KiB - multiply result with 1024
+ * Mi, MiB - multiply result with 1024^2
+ * Gi, GiB - multiply result with 1024^3
+ */
static int ustrtoul(const char *cp, char **endp, unsigned int base)
{
unsigned long result = simple_strtoul(cp, endp, base);
@@ -359,11 +380,16 @@ static int ustrtoul(const char *cp, char
result *= 1024;
case 'M':
result *= 1024;
+ case 'K':
case 'k':
result *= 1024;
/* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */
- if ((*endp)[1] == 'i')
- (*endp) += 2;
+ if ((*endp)[1] == 'i') {
+ if ((*endp)[2] == 'B')
+ (*endp) += 3;
+ else
+ (*endp) += 2;
+ }
}
return result;
}
@@ -383,26 +409,6 @@ static int parse_num(size_t *num, const
}
-static int parse_name(char **pname, const char *token, size_t limit)
-{
- size_t len;
- char *name;
-
- len = strlen(token) + 1;
- if (len > limit)
- return -ENOSPC;
-
- name = kmalloc(len, GFP_KERNEL);
- if (!name)
- return -ENOMEM;
-
- strcpy(name, token);
-
- *pname = name;
- return 0;
-}
-
-
static inline void kill_final_newline(char *str)
{
char *newline = strrchr(str, '\n');
@@ -416,9 +422,16 @@ #define parse_err(fmt, args...) do { \
return 0; \
} while (0)
-static int block2mtd_setup(const char *val, struct kernel_param *kp)
+#ifndef MODULE
+static int block2mtd_init_called = 0;
+static __initdata char block2mtd_paramline[80 + 12]; /* 80 for device, 12 for erase size */
+#endif
+
+
+static int block2mtd_setup2(const char *val)
{
- char buf[80+12], *str=buf; /* 80 for device, 12 for erase size */
+ char buf[80 + 12]; /* 80 for device, 12 for erase size */
+ char *str = buf;
char *token[2];
char *name;
size_t erase_size = PAGE_SIZE;
@@ -430,7 +443,7 @@ static int block2mtd_setup(const char *v
strcpy(str, val);
kill_final_newline(str);
- for (i=0; i<2; i++)
+ for (i = 0; i < 2; i++)
token[i] = strsep(&str, ",");
if (str)
@@ -439,18 +452,16 @@ static int block2mtd_setup(const char *v
if (!token[0])
parse_err("no argument");
- ret = parse_name(&name, token[0], 80);
- if (ret == -ENOMEM)
- parse_err("out of memory");
- if (ret == -ENOSPC)
- parse_err("name too long");
- if (ret)
- return 0;
+ name = token[0];
+ if (strlen(name) + 1 > 80)
+ parse_err("device name too long");
if (token[1]) {
ret = parse_num(&erase_size, token[1]);
- if (ret)
+ if (ret) {
+ kfree(name);
parse_err("illegal erase size");
+ }
}
add_device(name, erase_size);
@@ -459,13 +470,48 @@ static int block2mtd_setup(const char *v
}
+static int block2mtd_setup(const char *val, struct kernel_param *kp)
+{
+#ifdef MODULE
+ return block2mtd_setup2(val);
+#else
+ /* If more parameters are later passed in via
+ /sys/module/block2mtd/parameters/block2mtd
+ and block2mtd_init() has already been called,
+ we can parse the argument now. */
+
+ if (block2mtd_init_called)
+ return block2mtd_setup2(val);
+
+ /* During early boot stage, we only save the parameters
+ here. We must parse them later: if the param passed
+ from kernel boot command line, block2mtd_setup() is
+ called so early that it is not possible to resolve
+ the device (even kmalloc() fails). Deter that work to
+ block2mtd_setup2(). */
+
+ strlcpy(block2mtd_paramline, val, sizeof(block2mtd_paramline));
+
+ return 0;
+#endif
+}
+
+
module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
static int __init block2mtd_init(void)
{
+ int ret = 0;
INFO("version " VERSION);
- return 0;
+
+#ifndef MODULE
+ if (strlen(block2mtd_paramline))
+ ret = block2mtd_setup2(block2mtd_paramline);
+ block2mtd_init_called = 1;
+#endif
+
+ return ret;
}
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