switch /dev/loop to vfs_iter_write()

all writable files that might be used as backing store for /dev/loop
already support ->write_iter()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index d1f168b73634321dadb6c57571c0cd8a9de8304b..c4fd1e45ce1e82a8f303aacda953539dba99b3be 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -75,6 +75,7 @@
 #include <linux/sysfs.h>
 #include <linux/miscdevice.h>
 #include <linux/falloc.h>
+#include <linux/uio.h>
 #include "loop.h"
 
 #include <asm/uaccess.h>
@@ -229,13 +230,14 @@ lo_do_transfer(struct loop_device *lo, int cmd,
 static int __do_lo_send_write(struct file *file,
                u8 *buf, const int len, loff_t pos)
 {
+       struct kvec kvec = {.iov_base = buf, .iov_len = len};
+       struct iov_iter from;
        ssize_t bw;
-       mm_segment_t old_fs = get_fs();
+
+       iov_iter_kvec(&from, ITER_KVEC | WRITE, &kvec, 1, len);
 
        file_start_write(file);
-       set_fs(get_ds());
-       bw = file->f_op->write(file, buf, len, &pos);
-       set_fs(old_fs);
+       bw = vfs_iter_write(file, &from, &pos);
        file_end_write(file);
        if (likely(bw == len))
                return 0;
@@ -767,7 +769,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
                goto out_putf;
 
        if (!(file->f_mode & FMODE_WRITE) || !(mode & FMODE_WRITE) ||
-           !file->f_op->write)
+           !file->f_op->write_iter)
                lo_flags |= LO_FLAGS_READ_ONLY;
 
        lo_blocksize = S_ISBLK(inode->i_mode) ?