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switch /dev/loop to vfs_iter_write()

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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>
This commit is contained in:
Al Viro 2015-04-03 15:21:59 -04:00
parent 79ff50c09e
commit 283e7e5d24
1 changed files with 7 additions and 5 deletions
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12
drivers/block/loop.c
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@ -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) ?