mtd: harmonize mtd_writev usage
This patch makes the 'mtd_writev()' function more usable and logical. We first
teach it to fall-back to the 'default_mtd_writev()' function if the MTD driver
does not define its own '->writev()' method. Then we make block2mtd and JFFS2
just 'mtd_writev()' instead of 'default_mtd_writev()' function. This means we
can now stop exporting 'default_mtd_writev()' and instead, export
'mtd_writev()'. This is much cleaner and more logical, as well as allows us to
get read of another direct 'mtd->writev' access in JFFS2.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index b78f231..c16f6b4 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -288,7 +288,7 @@
dev->mtd.flags = MTD_CAP_RAM;
dev->mtd.erase = block2mtd_erase;
dev->mtd.write = block2mtd_write;
- dev->mtd.writev = default_mtd_writev;
+ dev->mtd.writev = mtd_writev;
dev->mtd.sync = block2mtd_sync;
dev->mtd.read = block2mtd_read;
dev->mtd.priv = dev;
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 53a200f..4d0f3e5 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -696,8 +696,8 @@
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
-int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
- unsigned long count, loff_t to, size_t *retlen)
+static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen)
{
unsigned long i;
size_t totlen = 0, thislen;
@@ -716,7 +716,27 @@
*retlen = totlen;
return ret;
}
-EXPORT_SYMBOL_GPL(default_mtd_writev);
+
+/*
+ * mtd_writev - the vector-based MTD write method
+ * @mtd: mtd device description object pointer
+ * @vecs: the vectors to write
+ * @count: count of vectors in @vecs
+ * @to: the MTD device offset to write to
+ * @retlen: on exit contains the count of bytes written to the MTD device.
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen)
+{
+ *retlen = 0;
+ if (!mtd->writev)
+ return default_mtd_writev(mtd, vecs, count, to, retlen);
+ return mtd->writev(mtd, vecs, count, to, retlen);
+}
+EXPORT_SYMBOL_GPL(mtd_writev);
/**
* mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size
diff --git a/fs/jffs2/writev.c b/fs/jffs2/writev.c
index 8d70407..a1bda9d 100644
--- a/fs/jffs2/writev.c
+++ b/fs/jffs2/writev.c
@@ -26,11 +26,7 @@
}
}
- if (c->mtd->writev)
- return mtd_writev(c->mtd, vecs, count, to, retlen);
- else {
- return default_mtd_writev(c->mtd, vecs, count, to, retlen);
- }
+ return mtd_writev(c->mtd, vecs, count, to, retlen);
}
int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index a994129..a58ecf4 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -394,16 +394,8 @@
return mtd->lock_user_prot_reg(mtd, from, len);
}
-/*
- * kvec-based read/write method. NB: The 'count' parameter is the number of
- * _vectors_, each of which contains an (ofs, len) tuple.
- */
-static inline int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
- unsigned long count, loff_t to, size_t *retlen)
-{
- *retlen = 0;
- return mtd->writev(mtd, vecs, count, to, retlen);
-}
+int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen);
static inline void mtd_sync(struct mtd_info *mtd)
{
@@ -510,10 +502,6 @@
extern void register_mtd_user (struct mtd_notifier *new);
extern int unregister_mtd_user (struct mtd_notifier *old);
-
-int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
- unsigned long count, loff_t to, size_t *retlen);
-
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size);
void mtd_erase_callback(struct erase_info *instr);
