linux-kernel - Re: [PATCH v2] fs: ocfs2: Adding new return type vm_fault

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Date:   Wed, 30 May 2018 17:10:01 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     mfasheh@...sity.com, Joel Becker <jlbec@...lplan.org>,
        Matthew Wilcox <willy@...radead.org>
Cc:     ocfs2-devel@....oracle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs: ocfs2: Adding new return type vm_fault_t

On Wed, May 23, 2018 at 9:02 PM, Souptick Joarder <jrdr.linux@...il.com> wrote:
> Use new return type vm_fault_t for fault handler. For
> now, this is just documenting that the function returns
> a VM_FAULT value rather than an errno. Once all instances
> are converted, vm_fault_t will become a distinct type.
>
> Ref-> commit 1c8f422059ae ("mm: change return type to vm_fault_t")
>
> vmf_error() is the newly introduce inline function
> in 4.18.
>
> Fix one checkpatch.pl warning by replacing BUG_ON()
> with WARN_ON()
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
> ---
>  fs/ocfs2/mmap.c | 44 ++++++++++++++++++++------------------------
>  1 file changed, 20 insertions(+), 24 deletions(-)
>
> diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
> index fb9a20e..036177e 100644
> --- a/fs/ocfs2/mmap.c
> +++ b/fs/ocfs2/mmap.c
> @@ -44,11 +44,11 @@
>  #include "ocfs2_trace.h"
>
>
> -static int ocfs2_fault(struct vm_fault *vmf)
> +static vm_fault_t ocfs2_fault(struct vm_fault *vmf)
>  {
>         struct vm_area_struct *vma = vmf->vma;
>         sigset_t oldset;
> -       int ret;
> +       vm_fault_t ret;
>
>         ocfs2_block_signals(&oldset);
>         ret = filemap_fault(vmf);
> @@ -59,10 +59,11 @@ static int ocfs2_fault(struct vm_fault *vmf)
>         return ret;
>  }
>
> -static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
> -                               struct page *page)
> +static vm_fault_t __ocfs2_page_mkwrite(struct file *file,
> +                       struct buffer_head *di_bh, struct page *page)
>  {
> -       int ret = VM_FAULT_NOPAGE;
> +       int err;
> +       vm_fault_t ret = VM_FAULT_NOPAGE;
>         struct inode *inode = file_inode(file);
>         struct address_space *mapping = inode->i_mapping;
>         loff_t pos = page_offset(page);
> @@ -105,15 +106,12 @@ static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
>         if (page->index == last_index)
>                 len = ((size - 1) & ~PAGE_MASK) + 1;
>
> -       ret = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_MMAP,
> +       err = ocfs2_write_begin_nolock(mapping, pos, len, OCFS2_WRITE_MMAP,
>                                        &locked_page, &fsdata, di_bh, page);
> -       if (ret) {
> -               if (ret != -ENOSPC)
> -                       mlog_errno(ret);
> -               if (ret == -ENOMEM)
> -                       ret = VM_FAULT_OOM;
> -               else
> -                       ret = VM_FAULT_SIGBUS;
> +       if (err) {
> +               if (err != -ENOSPC)
> +                       mlog_errno(err);
> +               ret = vmf_error(err);
>                 goto out;
>         }
>
> @@ -121,20 +119,21 @@ static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
>                 ret = VM_FAULT_NOPAGE;
>                 goto out;
>         }
> -       ret = ocfs2_write_end_nolock(mapping, pos, len, len, fsdata);
> -       BUG_ON(ret != len);
> +       err = ocfs2_write_end_nolock(mapping, pos, len, len, fsdata);
> +       WARN_ON(err != len);
>         ret = VM_FAULT_LOCKED;
>  out:
>         return ret;
>  }
>
> -static int ocfs2_page_mkwrite(struct vm_fault *vmf)
> +static vm_fault_t ocfs2_page_mkwrite(struct vm_fault *vmf)
>  {
>         struct page *page = vmf->page;
>         struct inode *inode = file_inode(vmf->vma->vm_file);
>         struct buffer_head *di_bh = NULL;
>         sigset_t oldset;
> -       int ret;
> +       int err;
> +       vm_fault_t ret;
>
>         sb_start_pagefault(inode->i_sb);
>         ocfs2_block_signals(&oldset);
> @@ -144,13 +143,10 @@ static int ocfs2_page_mkwrite(struct vm_fault *vmf)
>          * node. Taking the data lock will also ensure that we don't
>          * attempt page truncation as part of a downconvert.
>          */
> -       ret = ocfs2_inode_lock(inode, &di_bh, 1);
> -       if (ret < 0) {
> -               mlog_errno(ret);
> -               if (ret == -ENOMEM)
> -                       ret = VM_FAULT_OOM;
> -               else
> -                       ret = VM_FAULT_SIGBUS;
> +       err = ocfs2_inode_lock(inode, &di_bh, 1);
> +       if (err < 0) {
> +               mlog_errno(err);
> +               ret = vmf_error(err);
>                 goto out;
>         }
>
> --
> 1.9.1
>

Any comment for this patch ? We would like to
get this patch in queue for 4.18.