From: David Howells <dhowells@redhat.com>
To: Pavel Begunkov <asml.silence@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
Jens Axboe <axboe@kernel.dk>,
Alexander Viro <viro@zeniv.linux.org.uk>
Cc: dhowells@redhat.com,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 19/29] iov_iter: Split iov_iter_alignment()
Date: Sat, 21 Nov 2020 14:15:50 +0000 [thread overview]
Message-ID: <160596815051.154728.15434909811290333829.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <160596800145.154728.7192318545120181269.stgit@warthog.procyon.org.uk>
Split iov_iter_alignment() by type.
Signed-off-by: David Howells <dhowells@redhat.com>
---
lib/iov_iter.c | 59 ++++++++++++++++++++++++++++++++++++++++----------------
1 file changed, 42 insertions(+), 17 deletions(-)
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 90291188ace5..d2a66e951995 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1497,26 +1497,51 @@ void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count)
}
EXPORT_SYMBOL(iov_iter_discard);
-static unsigned long xxx_alignment(const struct iov_iter *i)
+static unsigned long iovec_alignment(const struct iov_iter *i)
{
unsigned long res = 0;
size_t size = i->count;
- if (unlikely(iov_iter_is_pipe(i))) {
- unsigned int p_mask = i->pipe->ring_size - 1;
+ iterate_over_iovec(i, size, v,
+ (res |= (unsigned long)v.iov_base | v.iov_len, 0));
+ return res;
+}
- if (size && i->iov_offset && allocated(&i->pipe->bufs[i->head & p_mask]))
- return size | i->iov_offset;
- return size;
- }
- iterate_all_kinds(i, size, v,
- (res |= (unsigned long)v.iov_base | v.iov_len, 0),
- res |= v.bv_offset | v.bv_len,
- res |= (unsigned long)v.iov_base | v.iov_len
- )
+static unsigned long bvec_alignment(const struct iov_iter *i)
+{
+ unsigned long res = 0;
+ size_t size = i->count;
+
+ iterate_over_bvec(i, size, v,
+ res |= v.bv_offset | v.bv_len);
return res;
}
+static unsigned long kvec_alignment(const struct iov_iter *i)
+{
+ unsigned long res = 0;
+ size_t size = i->count;
+
+ iterate_over_kvec(i, size, v,
+ res |= (unsigned long)v.iov_base | v.iov_len);
+ return res;
+}
+
+static unsigned long pipe_alignment(const struct iov_iter *i)
+{
+ size_t size = i->count;
+ unsigned int p_mask = i->pipe->ring_size - 1;
+
+ if (size && i->iov_offset && allocated(&i->pipe->bufs[i->head & p_mask]))
+ return size | i->iov_offset;
+ return size;
+}
+
+static unsigned long no_alignment(const struct iov_iter *i)
+{
+ return 0;
+}
+
static unsigned long xxx_gap_alignment(const struct iov_iter *i)
{
unsigned long res = 0;
@@ -2134,7 +2159,7 @@ static const struct iov_iter_ops iovec_iter_ops = {
.csum_and_copy_from_iter_full = xxx_csum_and_copy_from_iter_full,
.zero = iovec_zero,
- .alignment = xxx_alignment,
+ .alignment = iovec_alignment,
.gap_alignment = xxx_gap_alignment,
.get_pages = xxx_get_pages,
.get_pages_alloc = xxx_get_pages_alloc,
@@ -2168,7 +2193,7 @@ static const struct iov_iter_ops kvec_iter_ops = {
.csum_and_copy_from_iter_full = xxx_csum_and_copy_from_iter_full,
.zero = kvec_zero,
- .alignment = xxx_alignment,
+ .alignment = kvec_alignment,
.gap_alignment = xxx_gap_alignment,
.get_pages = xxx_get_pages,
.get_pages_alloc = xxx_get_pages_alloc,
@@ -2202,7 +2227,7 @@ static const struct iov_iter_ops bvec_iter_ops = {
.csum_and_copy_from_iter_full = xxx_csum_and_copy_from_iter_full,
.zero = bvec_zero,
- .alignment = xxx_alignment,
+ .alignment = bvec_alignment,
.gap_alignment = xxx_gap_alignment,
.get_pages = xxx_get_pages,
.get_pages_alloc = xxx_get_pages_alloc,
@@ -2236,7 +2261,7 @@ static const struct iov_iter_ops pipe_iter_ops = {
.csum_and_copy_from_iter_full = xxx_csum_and_copy_from_iter_full,
.zero = pipe_zero,
- .alignment = xxx_alignment,
+ .alignment = pipe_alignment,
.gap_alignment = xxx_gap_alignment,
.get_pages = xxx_get_pages,
.get_pages_alloc = xxx_get_pages_alloc,
@@ -2270,7 +2295,7 @@ static const struct iov_iter_ops discard_iter_ops = {
.csum_and_copy_from_iter_full = xxx_csum_and_copy_from_iter_full,
.zero = discard_zero,
- .alignment = xxx_alignment,
+ .alignment = no_alignment,
.gap_alignment = xxx_gap_alignment,
.get_pages = xxx_get_pages,
.get_pages_alloc = xxx_get_pages_alloc,
next prev parent reply other threads:[~2020-11-21 14:16 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-21 14:13 [PATCH 00/29] RFC: iov_iter: Switch to using an ops table David Howells
2020-11-21 14:13 ` [PATCH 01/29] iov_iter: Switch to using a table of operations David Howells
2020-11-21 14:31 ` Pavel Begunkov
2020-11-23 23:21 ` Pavel Begunkov
2020-11-21 18:21 ` Linus Torvalds
2020-12-11 1:30 ` Al Viro
2020-11-22 13:33 ` David Howells
2020-11-22 13:58 ` David Laight
2020-11-22 19:22 ` Linus Torvalds
2020-11-22 22:34 ` David Laight
2020-11-22 22:46 ` David Laight
2020-11-23 8:05 ` Christoph Hellwig
2020-11-23 10:31 ` David Howells
2020-11-23 23:42 ` Pavel Begunkov
2020-11-24 12:50 ` David Howells
2020-11-24 15:30 ` Jens Axboe
2020-11-27 17:14 ` David Howells
2020-11-23 11:14 ` David Howells
[not found] ` <20201203064536.GE27350@xsang-OptiPlex-9020>
2020-12-03 17:47 ` [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8% regression Linus Torvalds
2020-12-03 17:50 ` Jens Axboe
2020-12-04 11:50 ` David Howells
2020-12-04 11:51 ` David Howells
2020-12-07 13:10 ` Oliver Sang
2020-12-07 13:20 ` David Howells
2020-11-21 14:13 ` [PATCH 02/29] iov_iter: Split copy_page_to_iter() David Howells
2020-11-21 14:13 ` [PATCH 03/29] iov_iter: Split iov_iter_fault_in_readable David Howells
2020-11-21 14:13 ` [PATCH 04/29] iov_iter: Split the iterate_and_advance() macro David Howells
2020-11-21 14:14 ` [PATCH 05/29] iov_iter: Split copy_to_iter() David Howells
2020-11-21 14:14 ` [PATCH 06/29] iov_iter: Split copy_mc_to_iter() David Howells
2020-11-21 14:14 ` [PATCH 07/29] iov_iter: Split copy_from_iter() David Howells
2020-11-21 14:14 ` [PATCH 08/29] iov_iter: Split the iterate_all_kinds() macro David Howells
2020-11-21 14:14 ` [PATCH 09/29] iov_iter: Split copy_from_iter_full() David Howells
2020-11-21 14:14 ` [PATCH 10/29] iov_iter: Split copy_from_iter_nocache() David Howells
2020-11-21 14:14 ` [PATCH 11/29] iov_iter: Split copy_from_iter_flushcache() David Howells
2020-11-21 14:14 ` [PATCH 12/29] iov_iter: Split copy_from_iter_full_nocache() David Howells
2020-11-21 14:15 ` [PATCH 13/29] iov_iter: Split copy_page_from_iter() David Howells
2020-11-21 14:15 ` [PATCH 14/29] iov_iter: Split iov_iter_zero() David Howells
2020-11-21 14:15 ` [PATCH 15/29] iov_iter: Split copy_from_user_atomic() David Howells
2020-11-21 14:15 ` [PATCH 16/29] iov_iter: Split iov_iter_advance() David Howells
2020-11-21 14:15 ` [PATCH 17/29] iov_iter: Split iov_iter_revert() David Howells
2020-11-21 14:15 ` [PATCH 18/29] iov_iter: Split iov_iter_single_seg_count() David Howells
2020-11-21 14:15 ` David Howells [this message]
2020-11-21 14:15 ` [PATCH 20/29] iov_iter: Split iov_iter_gap_alignment() David Howells
2020-11-21 14:16 ` [PATCH 21/29] iov_iter: Split iov_iter_get_pages() David Howells
2020-11-21 14:16 ` [PATCH 22/29] iov_iter: Split iov_iter_get_pages_alloc() David Howells
2020-11-21 14:16 ` [PATCH 23/29] iov_iter: Split csum_and_copy_from_iter() David Howells
2020-11-21 14:16 ` [PATCH 24/29] iov_iter: Split csum_and_copy_from_iter_full() David Howells
2020-11-21 14:16 ` [PATCH 25/29] iov_iter: Split csum_and_copy_to_iter() David Howells
2020-11-21 14:16 ` [PATCH 26/29] iov_iter: Split iov_iter_npages() David Howells
2020-11-21 14:16 ` [PATCH 27/29] iov_iter: Split dup_iter() David Howells
2020-11-21 14:17 ` [PATCH 28/29] iov_iter: Split iov_iter_for_each_range() David Howells
2020-11-21 14:17 ` [PATCH 29/29] iov_iter: Remove iterate_all_kinds() and iterate_and_advance() David Howells
2020-11-21 14:34 ` [PATCH 00/29] RFC: iov_iter: Switch to using an ops table Pavel Begunkov
2020-11-21 18:23 ` Linus Torvalds
2020-12-11 3:24 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=160596815051.154728.15434909811290333829.stgit@warthog.procyon.org.uk \
--to=dhowells@redhat.com \
--cc=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=linux-block@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).