Change to use loff_t instead of unsigned long in some functions
to make sure mtdblock can handle offset bigger than 4G in 32 bits mode.
Signed-off-by: Lepton Wu <ytht....@gmail.com>
---
Changes in v2:
- Make the commit message more clearer and fix some format issues.
drivers/mtd/mtdblock.c | 35 ++++++++++++++++++-----------------
drivers/mtd/mtdblock_ro.c | 4 ++--
2 files changed, 20 insertions(+), 19 deletions(-)
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index bb4c14f83c75..373c0edca803 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -61,8 +61,8 @@ static void erase_callback(struct erase_info *done)
wake_up(wait_q);
}
-static int erase_write (struct mtd_info *mtd, unsigned long pos,
- int len, const char *buf)
+static int erase_write(struct mtd_info *mtd, loff_t pos, int len,
+ const char *buf)
{
struct erase_info erase;
DECLARE_WAITQUEUE(wait, current);
@@ -88,8 +88,7 @@ static int erase_write (struct mtd_info *mtd, unsigned long
pos,
if (ret) {
set_current_state(TASK_RUNNING);
remove_wait_queue(&wait_q, &wait);
- printk (KERN_WARNING "mtdblock: erase of region [0x%lx, 0x%x] "
- "on \"%s\" failed\n",
+ pr_warn("mtdblock: erase of region [0x%llx, 0x%x] on \"%s\"
failed\n",
pos, len, mtd->name);
return ret;
}
@@ -139,23 +138,24 @@ 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)
+static int do_cached_write(struct mtdblk_dev *mtdblk, loff_t pos,
+ int len, const char *buf)
{
struct mtd_info *mtd = mtdblk->mbd.mtd;
unsigned int sect_size = mtdblk->cache_size;
size_t retlen;
int ret;
- pr_debug("mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n",
+ pr_debug("mtdblock: write on \"%s\" at 0x%llx, size 0x%x\n",
mtd->name, pos, len);
if (!sect_size)
return mtd_write(mtd, pos, len, &retlen, buf);
while (len > 0) {
- unsigned long sect_start = (pos/sect_size)*sect_size;
- unsigned int offset = pos - sect_start;
+ unsigned int offset;
+ loff_t sect_start =
+ div_u64_rem(pos, sect_size, &offset) * sect_size;
unsigned int size = sect_size - offset;
if( size > len )
size = len;
@@ -209,23 +209,24 @@ 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)
+static int do_cached_read(struct mtdblk_dev *mtdblk, loff_t pos,
+ int len, char *buf)
{
struct mtd_info *mtd = mtdblk->mbd.mtd;
unsigned int sect_size = mtdblk->cache_size;
size_t retlen;
int ret;
- pr_debug("mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n",
- mtd->name, pos, len);
+ pr_debug("mtdblock: read on \"%s\" at 0x%llx, size 0x%x\n",
+ mtd->name, pos, len);
if (!sect_size)
return mtd_read(mtd, pos, len, &retlen, buf);
while (len > 0) {
- unsigned long sect_start = (pos/sect_size)*sect_size;
- unsigned int offset = pos - sect_start;
+ unsigned int offset;
+ loff_t sect_start =
+ div_u64_rem(pos, sect_size, &offset) * sect_size;
unsigned int size = sect_size - offset;
if (size > len)
size = len;
@@ -259,7 +260,7 @@ static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
unsigned long block, char *buf)
{
struct mtdblk_dev *mtdblk = container_of(dev, struct mtdblk_dev, mbd);
- return do_cached_read(mtdblk, block<<9, 512, buf);
+ return do_cached_read(mtdblk, (loff_t)block << 9, 512, buf);
}
static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
@@ -275,7 +276,7 @@ static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
* return -EAGAIN sometimes, but why bother?
*/
}
- return do_cached_write(mtdblk, block<<9, 512, buf);
+ return do_cached_write(mtdblk, (loff_t)block << 9, 512, buf);
}
static int mtdblock_open(struct mtd_blktrans_dev *mbd)
diff --git a/drivers/mtd/mtdblock_ro.c b/drivers/mtd/mtdblock_ro.c
index fb5dc89369de..92829e3fb3b7 100644
--- a/drivers/mtd/mtdblock_ro.c
+++ b/drivers/mtd/mtdblock_ro.c
@@ -31,7 +31,7 @@ static int mtdblock_readsect(struct mtd_blktrans_dev *dev,
{
size_t retlen;
- if (mtd_read(dev->mtd, (block * 512), 512, &retlen, buf))
+ if (mtd_read(dev->mtd, (loff_t)block << 9, 512, &retlen, buf))
return 1;
return 0;
}
@@ -41,7 +41,7 @@ static int mtdblock_writesect(struct mtd_blktrans_dev *dev,
{
size_t retlen;
- if (mtd_write(dev->mtd, (block * 512), 512, &retlen, buf))
+ if (mtd_write(dev->mtd, (loff_t)block << 9, 512, &retlen, buf))
return 1;
return 0;
}
--
2.11.0.483.g087da7b7c-goog
