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Date:   Fri, 30 Nov 2018 17:11:39 +0800
From:   "Yan, Zheng" <ukernel@...il.com>
To:     nborisov@...e.com
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>, Chris Mason <clm@...com>,
        josef@...icpanda.com, David Sterba <dsterba@...e.com>,
        Zheng Yan <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>, sfrench@...ba.org,
        "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca,
        mark@...heh.com, jlbec@...lplan.org, hubcap@...ibond.com,
        martin@...ibond.com, Andrew Morton <akpm@...ux-foundation.org>,
        rppt@...ux.vnet.ibm.com, willy@...radead.org,
        rdunlap@...radead.org, yuehaibing@...wei.com, shakeelb@...gle.com,
        dan.j.williams@...el.com, mhocko@...e.com,
        linux-afs@...ts.infradead.org,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        ceph-devel <ceph-devel@...r.kernel.org>,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-ext4@...r.kernel.org, ocfs2-devel@....oracle.com,
        devel@...ts.orangefs.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] fs: Don't open-code lru_to_page

On Thu, Nov 29, 2018 at 3:56 PM Nikolay Borisov <nborisov@...e.com> wrote:
>
> There are a bunch of filesystems which essentially open-code lru_to_page
> helper. Change them to using the helper. No functional changes.
>
> Signed-off-by: Nikolay Borisov <nborisov@...e.com>
> ---
>
> Since this is a mostly mechanical change I've actually batched all of them in
> a single patch.
>
>  fs/afs/file.c        | 5 +++--
>  fs/btrfs/extent_io.c | 2 +-
>  fs/ceph/addr.c       | 5 ++---
>  fs/cifs/file.c       | 3 ++-
>  fs/ext4/readpage.c   | 2 +-
>  fs/ocfs2/aops.c      | 3 ++-
>  fs/orangefs/inode.c  | 2 +-
>  mm/swap.c            | 2 +-
>  8 files changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/fs/afs/file.c b/fs/afs/file.c
> index d6bc3f5d784b..323ae9912203 100644
> --- a/fs/afs/file.c
> +++ b/fs/afs/file.c
> @@ -17,6 +17,7 @@
>  #include <linux/writeback.h>
>  #include <linux/gfp.h>
>  #include <linux/task_io_accounting_ops.h>
> +#include <linux/mm.h>
>  #include "internal.h"
>
>  static int afs_file_mmap(struct file *file, struct vm_area_struct *vma);
> @@ -441,7 +442,7 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
>         /* Count the number of contiguous pages at the front of the list.  Note
>          * that the list goes prev-wards rather than next-wards.
>          */
> -       first = list_entry(pages->prev, struct page, lru);
> +       first = lru_to_page(pages);
>         index = first->index + 1;
>         n = 1;
>         for (p = first->lru.prev; p != pages; p = p->prev) {
> @@ -473,7 +474,7 @@ static int afs_readpages_one(struct file *file, struct address_space *mapping,
>          * page at the end of the file.
>          */
>         do {
> -               page = list_entry(pages->prev, struct page, lru);
> +               page = lru_to_page(pages);
>                 list_del(&page->lru);
>                 index = page->index;
>                 if (add_to_page_cache_lru(page, mapping, index,
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 19f4b8fd654f..8332c5f4b1c3 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -4104,7 +4104,7 @@ int extent_readpages(struct address_space *mapping, struct list_head *pages,
>         u64 prev_em_start = (u64)-1;
>
>         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
> -               page = list_entry(pages->prev, struct page, lru);
> +               page = lru_to_page(pages);
>
>                 prefetchw(&page->flags);
>                 list_del(&page->lru);
> diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> index 8eade7a993c1..5d0c05e288cc 100644
> --- a/fs/ceph/addr.c
> +++ b/fs/ceph/addr.c
> @@ -306,7 +306,7 @@ static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx,
>         struct ceph_osd_client *osdc =
>                 &ceph_inode_to_client(inode)->client->osdc;
>         struct ceph_inode_info *ci = ceph_inode(inode);
> -       struct page *page = list_entry(page_list->prev, struct page, lru);
> +       struct page *page = lru_to_page(page_list);
>         struct ceph_vino vino;
>         struct ceph_osd_request *req;
>         u64 off;
> @@ -333,8 +333,7 @@ static int start_read(struct inode *inode, struct ceph_rw_context *rw_ctx,
>                         if (got)
>                                 ceph_put_cap_refs(ci, got);
>                         while (!list_empty(page_list)) {
> -                               page = list_entry(page_list->prev,
> -                                                 struct page, lru);
> +                               page = lru_to_page(page_list);
>                                 list_del(&page->lru);
>                                 put_page(page);
>                         }

For the ceph patch

Acked-by:: "Yan, Zheng" <zyan@...hat.com

> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index 74c33d5fafc8..b16a4d887d17 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -33,6 +33,7 @@
>  #include <linux/mount.h>
>  #include <linux/slab.h>
>  #include <linux/swap.h>
> +#include <linux/mm.h>
>  #include <asm/div64.h>
>  #include "cifsfs.h"
>  #include "cifspdu.h"
> @@ -3975,7 +3976,7 @@ readpages_get_pages(struct address_space *mapping, struct list_head *page_list,
>
>         INIT_LIST_HEAD(tmplist);
>
> -       page = list_entry(page_list->prev, struct page, lru);
> +       page = lru_to_page(page_list);
>
>         /*
>          * Lock the page and put it in the cache. Since no one else
> diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
> index f461d75ac049..6aa282ee455a 100644
> --- a/fs/ext4/readpage.c
> +++ b/fs/ext4/readpage.c
> @@ -128,7 +128,7 @@ int ext4_mpage_readpages(struct address_space *mapping,
>
>                 prefetchw(&page->flags);
>                 if (pages) {
> -                       page = list_entry(pages->prev, struct page, lru);
> +                       page = lru_to_page(pages);
>                         list_del(&page->lru);
>                         if (add_to_page_cache_lru(page, mapping, page->index,
>                                   readahead_gfp_mask(mapping)))
> diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
> index eb1ce30412dc..832c1759a09a 100644
> --- a/fs/ocfs2/aops.c
> +++ b/fs/ocfs2/aops.c
> @@ -30,6 +30,7 @@
>  #include <linux/quotaops.h>
>  #include <linux/blkdev.h>
>  #include <linux/uio.h>
> +#include <linux/mm.h>
>
>  #include <cluster/masklog.h>
>
> @@ -397,7 +398,7 @@ static int ocfs2_readpages(struct file *filp, struct address_space *mapping,
>          * Check whether a remote node truncated this file - we just
>          * drop out in that case as it's not worth handling here.
>          */
> -       last = list_entry(pages->prev, struct page, lru);
> +       last = lru_to_page(pages);
>         start = (loff_t)last->index << PAGE_SHIFT;
>         if (start >= i_size_read(inode))
>                 goto out_unlock;
> diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
> index fe53381b26b1..f038235c64bd 100644
> --- a/fs/orangefs/inode.c
> +++ b/fs/orangefs/inode.c
> @@ -77,7 +77,7 @@ static int orangefs_readpages(struct file *file,
>         for (page_idx = 0; page_idx < nr_pages; page_idx++) {
>                 struct page *page;
>
> -               page = list_entry(pages->prev, struct page, lru);
> +               page = lru_to_page(pages);
>                 list_del(&page->lru);
>                 if (!add_to_page_cache(page,
>                                        mapping,
> diff --git a/mm/swap.c b/mm/swap.c
> index aa483719922e..20b9e9d99652 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -126,7 +126,7 @@ void put_pages_list(struct list_head *pages)
>         while (!list_empty(pages)) {
>                 struct page *victim;
>
> -               victim = list_entry(pages->prev, struct page, lru);
> +               victim = lru_to_page(pages);
>                 list_del(&victim->lru);
>                 put_page(victim);
>         }
> --
> 2.17.1
>

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