lkml.org 
[lkml]   [2023]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 06/13] iov_iter: Derive user-backedness from the iterator type
Date
Use the iterator type to determine whether an iterator is user-backed or
not rather than using a special flag for it. Now that ITER_UBUF and
ITER_IOVEC are 0 and 1, they can be checked with a single comparison.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Alexander Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Christoph Hellwig <hch@lst.de>
cc: Christian Brauner <christian@brauner.io>
cc: Matthew Wilcox <willy@infradead.org>
cc: Linus Torvalds <torvalds@linux-foundation.org>
cc: David Laight <David.Laight@ACULAB.COM>
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
---
include/linux/uio.h | 4 +---
lib/iov_iter.c | 1 -
2 files changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index bef8e56aa45c..65d9143f83c8 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -43,7 +43,6 @@ struct iov_iter {
bool copy_mc;
bool nofault;
bool data_source;
- bool user_backed;
size_t iov_offset;
/*
* Hack alert: overlay ubuf_iovec with iovec + count, so
@@ -140,7 +139,7 @@ static inline unsigned char iov_iter_rw(const struct iov_iter *i)

static inline bool user_backed_iter(const struct iov_iter *i)
{
- return i->user_backed;
+ return iter_is_ubuf(i) || iter_is_iovec(i);
}

/*
@@ -380,7 +379,6 @@ static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction,
*i = (struct iov_iter) {
.iter_type = ITER_UBUF,
.copy_mc = false,
- .user_backed = true,
.data_source = direction,
.ubuf = buf,
.count = count,
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 27234a820eeb..227c9f536b94 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -290,7 +290,6 @@ void iov_iter_init(struct iov_iter *i, unsigned int direction,
.iter_type = ITER_IOVEC,
.copy_mc = false,
.nofault = false,
- .user_backed = true,
.data_source = direction,
.__iov = iov,
.nr_segs = nr_segs,
\
 
 \ /
  Last update: 2023-09-22 16:27    [W:0.120 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site