block_dev: add support for read_iter, write_iter

Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index f3223aac4df11c41959a744bee67af2d2df232e5..db5fa4e9b9e50f3a88bce0993b01420b53e8735f 100644 (file)
--- 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 6f8c9e4e13f4c33bc45e1cb750346bd0b456b475..89d8ec543e65a5e5987bdd95e8af9bb55ab5c9f7 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1508,8 +1508,7 @@ 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;
@@ -1518,7 +1517,7 @@ 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;
 
@@ -1529,10 +1528,10 @@ 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;
@@ -1543,8 +1542,8 @@ static ssize_t blkdev_aio_read(struct kiocb *iocb, const struct iovec *iov,
 
        size -= pos;
        if (size < iocb->ki_left)
-               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);
 }
 
 /*
@@ -1578,8 +1577,8 @@ 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 06f2290683a824df84e409f8f19017f1d489b36f..269ef07e6af390bd32b04e27669e45a410d7af9f 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2526,8 +2526,8 @@ 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);