The patch titled
Subject: vmsplice: relax alignement requirements for SPLICE_F_GIFT
has been added to the -mm tree. Its filename is
vmsplice-relax-alignement-requirements-for-splice_f_gift.patch
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From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Subject: vmsplice: relax alignement requirements for SPLICE_F_GIFT
It seems there is no fundamental reason to limit vmsplice() SPLICE_F_GIFT
to page aligned chunks.
All helpers are prepared to cope with offsets in page.
This limitation makes vmsplice() API very impractical in the zero-copy
land.
Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Tom Herbert <therbert@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Changli Gao <xiaosuo@xxxxxxxxx>
Cc: Miklos Szeredi <mszeredi@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/splice.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN fs/splice.c~vmsplice-relax-alignement-requirements-for-splice_f_gift fs/splice.c
--- a/fs/splice.c~vmsplice-relax-alignement-requirements-for-splice_f_gift
+++ a/fs/splice.c
@@ -1388,7 +1388,7 @@ static long do_splice(struct file *in, l
*/
static int get_iovec_page_array(const struct iovec __user *iov,
unsigned int nr_vecs, struct page **pages,
- struct partial_page *partial, int aligned,
+ struct partial_page *partial, bool aligned,
unsigned int pipe_buffers)
{
int buffers = 0, error = 0;
@@ -1626,7 +1626,7 @@ static long vmsplice_to_pipe(struct file
return -ENOMEM;
spd.nr_pages = get_iovec_page_array(iov, nr_segs, spd.pages,
- spd.partial, flags & SPLICE_F_GIFT,
+ spd.partial, false,
pipe->buffers);
if (spd.nr_pages <= 0)
ret = spd.nr_pages;
_
Subject: Subject: vmsplice: relax alignement requirements for SPLICE_F_GIFT
Patches currently in -mm which might be from eric.dumazet@xxxxxxxxx are
linux-next.patch
net-use-this_cpu_xxx-replace-percpu_xxx-funcs.patch
vmsplice-relax-alignement-requirements-for-splice_f_gift.patch
syscalls-x86-add-__nr_kcmp-syscall-v8.patch
--
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