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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-03 15:57:04 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-11 22:29:40 -0400
commitcd28e28d801e052a3378161c9cb3231828cfaa77 (patch)
treea9599da6cd2f68f98a38a71beec7cdf05380f45b /drivers/char/mem.c
parent5d5d568975307877e9195f5305f4240e506a2807 (diff)
downloadlwn-cd28e28d801e052a3378161c9cb3231828cfaa77.tar.gz
lwn-cd28e28d801e052a3378161c9cb3231828cfaa77.zip
switch drivers/char/mem.c to ->read_iter/->write_iter
Note that _these_ guys have ->read() and ->write() left in place - they are eqiuvalent to what we'd get if we replaced those with NULL, but we are talking about hot paths here. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index ad08400491ae..6b1721f978c2 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -607,16 +607,16 @@ static ssize_t write_null(struct file *file, const char __user *buf,
return count;
}
-static ssize_t aio_read_null(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static ssize_t read_iter_null(struct kiocb *iocb, struct iov_iter *to)
{
return 0;
}
-static ssize_t aio_write_null(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos)
+static ssize_t write_iter_null(struct kiocb *iocb, struct iov_iter *from)
{
- return iov_length(iov, nr_segs);
+ size_t count = iov_iter_count(from);
+ iov_iter_advance(from, count);
+ return count;
}
static int pipe_to_null(struct pipe_inode_info *info, struct pipe_buffer *buf,
@@ -718,7 +718,7 @@ static int open_port(struct inode *inode, struct file *filp)
#define zero_lseek null_lseek
#define full_lseek null_lseek
#define write_zero write_null
-#define aio_write_zero aio_write_null
+#define write_iter_zero write_iter_null
#define open_mem open_port
#define open_kmem open_mem
@@ -750,8 +750,8 @@ static const struct file_operations null_fops = {
.llseek = null_lseek,
.read = read_null,
.write = write_null,
- .aio_read = aio_read_null,
- .aio_write = aio_write_null,
+ .read_iter = read_iter_null,
+ .write_iter = write_iter_null,
.splice_write = splice_write_null,
};
@@ -766,7 +766,7 @@ static const struct file_operations zero_fops = {
.llseek = zero_lseek,
.write = write_zero,
.read_iter = read_iter_zero,
- .aio_write = aio_write_zero,
+ .write_iter = write_iter_zero,
.mmap = mmap_zero,
#ifndef CONFIG_MMU
.mmap_capabilities = zero_mmap_capabilities,