-/*
+/*
* Direct MTD block device access
*
- * $Id: mtdblock.c,v 1.63 2003/06/23 12:00:08 dwmw2 Exp $
+ * $Id: mtdblock.c,v 1.68 2005/11/07 11:14:20 gleixner Exp $
*
* (C) 2000-2003 Nicolas Pitre <nico@cam.org>
* (C) 1999-2003 David Woodhouse <dwmw2@infradead.org>
*/
#include <linux/config.h>
-#include <linux/types.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
#include <linux/slab.h>
+#include <linux/types.h>
#include <linux/vmalloc.h>
+
#include <linux/mtd/mtd.h>
#include <linux/mtd/blktrans.h>
/*
* Cache stuff...
- *
+ *
* Since typical flash erasable sectors are much larger than what Linux's
* buffer cache can handle, we must implement read-modify-write on flash
* sectors for each block write requests. To avoid over-erasing flash sectors
wake_up(wait_q);
}
-static int erase_write (struct mtd_info *mtd, unsigned long pos,
+static int erase_write (struct mtd_info *mtd, unsigned long pos,
int len, const char *buf)
{
struct erase_info erase;
return 0;
DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: writing cached data for \"%s\" "
- "at 0x%lx, size 0x%x\n", mtd->name,
+ "at 0x%lx, size 0x%x\n", mtd->name,
mtdblk->cache_offset, mtdblk->cache_size);
-
- ret = erase_write (mtd, mtdblk->cache_offset,
+
+ ret = erase_write (mtd, mtdblk->cache_offset,
mtdblk->cache_size, mtdblk->cache_data);
if (ret)
return ret;
/*
* Here we could argubly set the cache state to STATE_CLEAN.
- * However this could lead to inconsistency since we will not
- * be notified if this content is altered on the flash by other
+ * However this could lead to inconsistency since we will not
+ * be notified if this content is altered on the flash by other
* means. Let's declare it empty and leave buffering tasks to
* the buffer cache instead.
*/
}
-static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
+static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
int len, const char *buf)
{
struct mtd_info *mtd = mtdblk->mtd;
DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n",
mtd->name, pos, len);
-
+
if (!sect_size)
return MTD_WRITE (mtd, pos, len, &retlen, buf);
unsigned long sect_start = (pos/sect_size)*sect_size;
unsigned int offset = pos - sect_start;
unsigned int size = sect_size - offset;
- if( size > len )
+ if( size > len )
size = len;
if (size == sect_size) {
- /*
+ /*
* We are covering a whole sector. Thus there is no
* need to bother with the cache while it may still be
* useful for other partial writes.
if (mtdblk->cache_state == STATE_DIRTY &&
mtdblk->cache_offset != sect_start) {
ret = write_cached_data(mtdblk);
- if (ret)
+ if (ret)
return ret;
}
}
-static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
+static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
int len, char *buf)
{
struct mtd_info *mtd = mtdblk->mtd;
size_t retlen;
int ret;
- DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
+ DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
mtd->name, pos, len);
-
+
if (!sect_size)
return MTD_READ (mtd, pos, len, &retlen, buf);
unsigned long sect_start = (pos/sect_size)*sect_size;
unsigned int offset = pos - sect_start;
unsigned int size = sect_size - offset;
- if (size > len)
+ if (size > len)
size = len;
/*
unsigned long block, char *buf)
{
struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
- if (unlikely(!mtdblk->cache_data)) {
+ if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {
mtdblk->cache_data = vmalloc(mtdblk->mtd->erasesize);
if (!mtdblk->cache_data)
return -EINTR;
int dev = mbd->devnum;
DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n");
-
+
if (mtdblks[dev]) {
mtdblks[dev]->count++;
return 0;
}
-
+
/* OK, it's not open. Create cache info for it */
mtdblk = kmalloc(sizeof(struct mtdblk_dev), GFP_KERNEL);
- if (!mtdblks)
+ if (!mtdblk)
return -ENOMEM;
memset(mtdblk, 0, sizeof(*mtdblk));
}
mtdblks[dev] = mtdblk;
-
+
DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
return 0;
DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
return 0;
-}
+}
static int mtdblock_flush(struct mtd_blktrans_dev *dev)
{
kfree(dev);
}
-struct mtd_blktrans_ops mtdblock_tr = {
+static struct mtd_blktrans_ops mtdblock_tr = {
.name = "mtdblock",
.major = 31,
.part_bits = 0,
.owner = THIS_MODULE,
};
-int __init init_mtdblock(void)
+static int __init init_mtdblock(void)
{
return register_mtd_blktrans(&mtdblock_tr);
}