The patch titled
Subject: NFS: direct-io: convert to FOLL_PIN pages
has been added to the -mm mm-unstable branch. Its filename is
nfs-direct-io-convert-to-foll_pin-pages.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nfs-direct-io-convert-to-foll_pin-pages.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: John Hubbard <jhubbard@xxxxxxxxxx>
Subject: NFS: direct-io: convert to FOLL_PIN pages
Date: Tue, 30 Aug 2022 21:18:42 -0700
Convert the NFS Direct IO layer to use pin_user_pages_fast() and
unpin_user_page(), instead of get_user_pages_fast() and put_page().
The user of pin_user_pages_fast() depends upon:
1) CONFIG_BLK_USE_PIN_USER_PAGES_FOR_DIO, and
2) User-space-backed pages: user_backed_iter(i) == true
Link: https://lkml.kernel.org/r/20220831041843.973026-7-jhubbard@xxxxxxxxxx
Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Anna Schumaker <anna@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nfs/direct.c | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
--- a/fs/nfs/direct.c~nfs-direct-io-convert-to-foll_pin-pages
+++ a/fs/nfs/direct.c
@@ -142,11 +142,13 @@ int nfs_swap_rw(struct kiocb *iocb, stru
return 0;
}
-static void nfs_direct_release_pages(struct page **pages, unsigned int npages)
+static void nfs_direct_release_pages(struct iov_iter *iter, struct page **pages,
+ unsigned int npages)
{
- unsigned int i;
- for (i = 0; i < npages; i++)
- put_page(pages[i]);
+ if (user_backed_iter(iter) || iov_iter_is_bvec(iter))
+ dio_w_unpin_user_pages(pages, npages);
+ else
+ release_pages(pages, npages);
}
void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
@@ -332,11 +334,11 @@ static ssize_t nfs_direct_read_schedule_
size_t pgbase;
unsigned npages, i;
- result = iov_iter_get_pages_alloc2(iter, &pagevec,
+ result = dio_w_iov_iter_pin_pages_alloc(iter, &pagevec,
rsize, &pgbase);
if (result < 0)
break;
-
+
bytes = result;
npages = (result + pgbase + PAGE_SIZE - 1) / PAGE_SIZE;
for (i = 0; i < npages; i++) {
@@ -362,7 +364,7 @@ static ssize_t nfs_direct_read_schedule_
pos += req_len;
dreq->bytes_left -= req_len;
}
- nfs_direct_release_pages(pagevec, npages);
+ nfs_direct_release_pages(iter, pagevec, npages);
kvfree(pagevec);
if (result < 0)
break;
@@ -791,8 +793,8 @@ static ssize_t nfs_direct_write_schedule
size_t pgbase;
unsigned npages, i;
- result = iov_iter_get_pages_alloc2(iter, &pagevec,
- wsize, &pgbase);
+ result = dio_w_iov_iter_pin_pages_alloc(iter, &pagevec,
+ wsize, &pgbase);
if (result < 0)
break;
@@ -829,7 +831,7 @@ static ssize_t nfs_direct_write_schedule
pos += req_len;
dreq->bytes_left -= req_len;
}
- nfs_direct_release_pages(pagevec, npages);
+ nfs_direct_release_pages(iter, pagevec, npages);
kvfree(pagevec);
if (result < 0)
break;
_
Patches currently in -mm which might be from jhubbard@xxxxxxxxxx are
mm-change-release_pages-to-use-unsigned-long-for-npages.patch
mm-gup-introduce-pin_user_page.patch
block-add-dio_w_-wrappers-for-pin-unpin-user-pages.patch
iov_iter-new-iov_iter_pin_pages-routines.patch
block-bio-fs-convert-most-filesystems-to-pin_user_pages_fast.patch
nfs-direct-io-convert-to-foll_pin-pages.patch
fuse-convert-direct-io-paths-to-use-foll_pin.patch
