[PATCH V5 24/30] block_dev: add support for read_iter, write_iter

From: Dave Kleikamp
Date: Wed Jan 09 2013 - 14:59:18 EST


From: Asias He <asias@xxxxxxxxxx>

Signed-off-by: Asias He <asias@xxxxxxxxxx>
Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
---
drivers/char/raw.c | 4 ++--
fs/block_dev.c | 19 +++++++++----------
include/linux/fs.h | 4 ++--
3 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 54a3a6d..443c2d8 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -285,9 +285,9 @@ static long raw_ctl_compat_ioctl(struct file *file, unsigned int cmd,

static const struct file_operations raw_fops = {
.read = do_sync_read,
- .aio_read = generic_file_aio_read,
+ .read_iter = generic_file_read_iter,
.write = do_sync_write,
- .aio_write = blkdev_aio_write,
+ .write_iter = blkdev_write_iter,
.fsync = blkdev_fsync,
.open = raw_open,
.release = raw_release,
diff --git a/fs/block_dev.c b/fs/block_dev.c
index df8aa76..039ae6a 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1521,8 +1521,7 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
* Does not take i_mutex for the write and thus is not for general purpose
* use.
*/
-ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *iter, loff_t pos)
{
struct file *file = iocb->ki_filp;
struct blk_plug plug;
@@ -1531,7 +1530,7 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
BUG_ON(iocb->ki_pos != pos);

blk_start_plug(&plug);
- ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
+ ret = __generic_file_write_iter(iocb, iter, &iocb->ki_pos);
if (ret > 0 || ret == -EIOCBQUEUED) {
ssize_t err;

@@ -1542,10 +1541,10 @@ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
blk_finish_plug(&plug);
return ret;
}
-EXPORT_SYMBOL_GPL(blkdev_aio_write);
+EXPORT_SYMBOL_GPL(blkdev_write_iter);

-static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos)
{
struct file *file = iocb->ki_filp;
struct inode *bd_inode = file->f_mapping->host;
@@ -1556,8 +1555,8 @@ static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,

size -= pos;
if (size < INT_MAX)
- nr_segs = iov_shorten((struct iovec *)iov, nr_segs, size);
- return generic_file_aio_read(iocb, iov, nr_segs, pos);
+ iov_iter_shorten(iter, size);
+ return generic_file_read_iter(iocb, iter, pos);
}

/*
@@ -1590,8 +1589,8 @@ const struct file_operations def_blk_fops = {
.llseek = block_llseek,
.read = do_sync_read,
.write = do_sync_write,
- .aio_read = blkdev_aio_read,
- .aio_write = blkdev_aio_write,
+ .read_iter = blkdev_read_iter,
+ .write_iter = blkdev_write_iter,
.mmap = generic_file_mmap,
.fsync = blkdev_fsync,
.unlocked_ioctl = block_ioctl,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 679c7cc..8cc8b0d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2485,8 +2485,8 @@ extern int generic_segment_checks(const struct iovec *iov,
unsigned long *nr_segs, size_t *count, int access_flags);

/* fs/block_dev.c */
-extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos);
+extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos);
extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
int datasync);
extern void block_sync_page(struct page *page);
--
1.8.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/