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Diffstat (limited to 'drivers/mtd/mtdblock.c')
-rw-r--r--drivers/mtd/mtdblock.c135
1 files changed, 67 insertions, 68 deletions
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 9f41b1a853c..485ea751c7f 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -1,8 +1,23 @@
/*
* Direct MTD block device access
*
- * (C) 2000-2003 Nicolas Pitre <nico@fluxnic.net>
- * (C) 1999-2003 David Woodhouse <dwmw2@infradead.org>
+ * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
+ * Copyright © 2000-2003 Nicolas Pitre <nico@fluxnic.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
*/
#include <linux/fs.h>
@@ -17,19 +32,20 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/blktrans.h>
#include <linux/mutex.h>
+#include <linux/major.h>
-static struct mtdblk_dev {
- struct mtd_info *mtd;
+struct mtdblk_dev {
+ struct mtd_blktrans_dev mbd;
int count;
struct mutex cache_mutex;
unsigned char *cache_data;
unsigned long cache_offset;
unsigned int cache_size;
enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state;
-} *mtdblks[MAX_MTD_DEVICES];
+};
-static struct mutex mtdblks_lock;
+static DEFINE_MUTEX(mtdblks_lock);
/*
* Cache stuff...
@@ -70,7 +86,7 @@ static int erase_write (struct mtd_info *mtd, unsigned long pos,
set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(&wait_q, &wait);
- ret = mtd->erase(mtd, &erase);
+ ret = mtd_erase(mtd, &erase);
if (ret) {
set_current_state(TASK_RUNNING);
remove_wait_queue(&wait_q, &wait);
@@ -87,7 +103,7 @@ static int erase_write (struct mtd_info *mtd, unsigned long pos,
* Next, write the data to flash.
*/
- ret = mtd->write(mtd, pos, len, &retlen, buf);
+ ret = mtd_write(mtd, pos, len, &retlen, buf);
if (ret)
return ret;
if (retlen != len)
@@ -98,13 +114,13 @@ static int erase_write (struct mtd_info *mtd, unsigned long pos,
static int write_cached_data (struct mtdblk_dev *mtdblk)
{
- struct mtd_info *mtd = mtdblk->mtd;
+ struct mtd_info *mtd = mtdblk->mbd.mtd;
int ret;
if (mtdblk->cache_state != STATE_DIRTY)
return 0;
- DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: writing cached data for \"%s\" "
+ pr_debug("mtdblock: writing cached data for \"%s\" "
"at 0x%lx, size 0x%x\n", mtd->name,
mtdblk->cache_offset, mtdblk->cache_size);
@@ -114,7 +130,7 @@ static int write_cached_data (struct mtdblk_dev *mtdblk)
return ret;
/*
- * Here we could argubly set the cache state to STATE_CLEAN.
+ * Here we could arguably 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
* means. Let's declare it empty and leave buffering tasks to
@@ -128,16 +144,16 @@ static int write_cached_data (struct mtdblk_dev *mtdblk)
static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
int len, const char *buf)
{
- struct mtd_info *mtd = mtdblk->mtd;
+ struct mtd_info *mtd = mtdblk->mbd.mtd;
unsigned int sect_size = mtdblk->cache_size;
size_t retlen;
int ret;
- DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n",
+ pr_debug("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);
+ return mtd_write(mtd, pos, len, &retlen, buf);
while (len > 0) {
unsigned long sect_start = (pos/sect_size)*sect_size;
@@ -169,8 +185,8 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos,
mtdblk->cache_offset != sect_start) {
/* fill the cache with the current sector */
mtdblk->cache_state = STATE_EMPTY;
- ret = mtd->read(mtd, sect_start, sect_size,
- &retlen, mtdblk->cache_data);
+ ret = mtd_read(mtd, sect_start, sect_size,
+ &retlen, mtdblk->cache_data);
if (ret)
return ret;
if (retlen != sect_size)
@@ -198,16 +214,16 @@ static int do_cached_write (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;
+ struct mtd_info *mtd = mtdblk->mbd.mtd;
unsigned int sect_size = mtdblk->cache_size;
size_t retlen;
int ret;
- DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
+ pr_debug("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);
+ return mtd_read(mtd, pos, len, &retlen, buf);
while (len > 0) {
unsigned long sect_start = (pos/sect_size)*sect_size;
@@ -226,7 +242,7 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
mtdblk->cache_offset == sect_start) {
memcpy (buf, mtdblk->cache_data + offset, size);
} else {
- ret = mtd->read(mtd, pos, size, &retlen, buf);
+ ret = mtd_read(mtd, pos, size, &retlen, buf);
if (ret)
return ret;
if (retlen != size)
@@ -244,16 +260,16 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos,
static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
unsigned long block, char *buf)
{
- struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
+ struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
return do_cached_read(mtdblk, block<<9, 512, buf);
}
static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
unsigned long block, char *buf)
{
- struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
+ struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
if (unlikely(!mtdblk->cache_data && mtdblk->cache_size)) {
- mtdblk->cache_data = vmalloc(mtdblk->mtd->erasesize);
+ mtdblk->cache_data = vmalloc(mtdblk->mbd.mtd->erasesize);
if (!mtdblk->cache_data)
return -EINTR;
/* -EINTR is not really correct, but it is the best match
@@ -266,50 +282,38 @@ static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
static int mtdblock_open(struct mtd_blktrans_dev *mbd)
{
- struct mtdblk_dev *mtdblk;
- struct mtd_info *mtd = mbd->mtd;
- int dev = mbd->devnum;
+ struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);
- DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n");
+ pr_debug("mtdblock_open\n");
mutex_lock(&mtdblks_lock);
- if (mtdblks[dev]) {
- mtdblks[dev]->count++;
+ if (mtdblk->count) {
+ mtdblk->count++;
mutex_unlock(&mtdblks_lock);
return 0;
}
/* OK, it's not open. Create cache info for it */
- mtdblk = kzalloc(sizeof(struct mtdblk_dev), GFP_KERNEL);
- if (!mtdblk) {
- mutex_unlock(&mtdblks_lock);
- return -ENOMEM;
- }
-
mtdblk->count = 1;
- mtdblk->mtd = mtd;
-
mutex_init(&mtdblk->cache_mutex);
mtdblk->cache_state = STATE_EMPTY;
- if ( !(mtdblk->mtd->flags & MTD_NO_ERASE) && mtdblk->mtd->erasesize) {
- mtdblk->cache_size = mtdblk->mtd->erasesize;
+ if (!(mbd->mtd->flags & MTD_NO_ERASE) && mbd->mtd->erasesize) {
+ mtdblk->cache_size = mbd->mtd->erasesize;
mtdblk->cache_data = NULL;
}
- mtdblks[dev] = mtdblk;
mutex_unlock(&mtdblks_lock);
- DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
+ pr_debug("ok\n");
return 0;
}
-static int mtdblock_release(struct mtd_blktrans_dev *mbd)
+static void mtdblock_release(struct mtd_blktrans_dev *mbd)
{
- int dev = mbd->devnum;
- struct mtdblk_dev *mtdblk = mtdblks[dev];
+ struct mtdblk_dev *mtdblk = container_of(mbd, struct mtdblk_dev, mbd);
- DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n");
+ pr_debug("mtdblock_release\n");
mutex_lock(&mtdblks_lock);
@@ -318,62 +322,59 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd)
mutex_unlock(&mtdblk->cache_mutex);
if (!--mtdblk->count) {
- /* It was the last usage. Free the device */
- mtdblks[dev] = NULL;
- if (mtdblk->mtd->sync)
- mtdblk->mtd->sync(mtdblk->mtd);
+ /*
+ * It was the last usage. Free the cache, but only sync if
+ * opened for writing.
+ */
+ if (mbd->file_mode & FMODE_WRITE)
+ mtd_sync(mbd->mtd);
vfree(mtdblk->cache_data);
- kfree(mtdblk);
}
mutex_unlock(&mtdblks_lock);
- DEBUG(MTD_DEBUG_LEVEL1, "ok\n");
-
- return 0;
+ pr_debug("ok\n");
}
static int mtdblock_flush(struct mtd_blktrans_dev *dev)
{
- struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
+ struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
mutex_lock(&mtdblk->cache_mutex);
write_cached_data(mtdblk);
mutex_unlock(&mtdblk->cache_mutex);
-
- if (mtdblk->mtd->sync)
- mtdblk->mtd->sync(mtdblk->mtd);
+ mtd_sync(dev->mtd);
return 0;
}
static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
{
- struct mtd_blktrans_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ struct mtdblk_dev *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return;
- dev->mtd = mtd;
- dev->devnum = mtd->index;
+ dev->mbd.mtd = mtd;
+ dev->mbd.devnum = mtd->index;
- dev->size = mtd->size >> 9;
- dev->tr = tr;
+ dev->mbd.size = mtd->size >> 9;
+ dev->mbd.tr = tr;
if (!(mtd->flags & MTD_WRITEABLE))
- dev->readonly = 1;
+ dev->mbd.readonly = 1;
- add_mtd_blktrans_dev(dev);
+ if (add_mtd_blktrans_dev(&dev->mbd))
+ kfree(dev);
}
static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev)
{
del_mtd_blktrans_dev(dev);
- kfree(dev);
}
static struct mtd_blktrans_ops mtdblock_tr = {
.name = "mtdblock",
- .major = 31,
+ .major = MTD_BLOCK_MAJOR,
.part_bits = 0,
.blksize = 512,
.open = mtdblock_open,
@@ -388,8 +389,6 @@ static struct mtd_blktrans_ops mtdblock_tr = {
static int __init init_mtdblock(void)
{
- mutex_init(&mtdblks_lock);
-
return register_mtd_blktrans(&mtdblock_tr);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 22:02:40 +0000