linux-ext4 - Re: [PATCH] ext4: Convert int to vm_fault

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Date:   Sat, 28 Jul 2018 14:19:00 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Matthew Wilcox <willy@...radead.org>,
        "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca,
        "Darrick J. Wong" <darrick.wong@...cle.com>, axboe@...nel.dk,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>, kemi.wang@...el.com
Cc:     Sabyasachi Gupta <sabyasachi.linux@...il.com>,
        Brajeswar Ghosh <brajeswar.linux@...il.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: Convert int to vm_fault_t type

On Sat, Jul 28, 2018 at 2:20 PM, Souptick Joarder <jrdr.linux@...il.com> wrote:
> Use new return type vm_fault_t for ext4_page_mkwrite
> handler and block_page_mkwrite_return.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>

As part of commit 2fae376c0a16db42eb438 in linux-next tree,
this conversion was missed. Sorry about it.

> ---
>  fs/ext4/ext4.h              |  2 +-
>  fs/ext4/inode.c             | 20 ++++++++++----------
>  include/linux/buffer_head.h |  3 ++-
>  3 files changed, 13 insertions(+), 12 deletions(-)
>
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index aec0010..1183773 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2469,7 +2469,7 @@ int do_journal_get_write_access(handle_t *handle,
>  extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
>  extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
>                              loff_t lstart, loff_t lend);
> -extern int ext4_page_mkwrite(struct vm_fault *vmf);
> +extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
>  extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
>  extern qsize_t *ext4_get_reserved_space(struct inode *inode);
>  extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 03ac322..b491fdb 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -6108,27 +6108,27 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh)
>         return !buffer_mapped(bh);
>  }
>
> -int ext4_page_mkwrite(struct vm_fault *vmf)
> +vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf)
>  {
>         struct vm_area_struct *vma = vmf->vma;
>         struct page *page = vmf->page;
>         loff_t size;
>         unsigned long len;
> -       int ret;
> +       vm_fault_t ret;
>         struct file *file = vma->vm_file;
>         struct inode *inode = file_inode(file);
>         struct address_space *mapping = inode->i_mapping;
>         handle_t *handle;
>         get_block_t *get_block;
> -       int retries = 0;
> +       int retries = 0, err;
>
>         sb_start_pagefault(inode->i_sb);
>         file_update_time(vma->vm_file);
>
>         down_read(&EXT4_I(inode)->i_mmap_sem);
>
> -       ret = ext4_convert_inline_data(inode);
> -       if (ret)
> +       err = ext4_convert_inline_data(inode);
> +       if (err)
>                 goto out_ret;
>
>         /* Delalloc case is easy... */
> @@ -6138,9 +6138,9 @@ int ext4_page_mkwrite(struct vm_fault *vmf)
>                 do {
>                         ret = block_page_mkwrite(vma, vmf,
>                                                    ext4_da_get_block_prep);
> -               } while (ret == -ENOSPC &&
> +               } while (ret == VM_FAULT_SIGBUS &&
>                        ext4_should_retry_alloc(inode->i_sb, &retries));
> -               goto out_ret;
> +               goto out;
>         }
>
>         lock_page(page);
> @@ -6188,17 +6188,17 @@ int ext4_page_mkwrite(struct vm_fault *vmf)
>                 if (ext4_walk_page_buffers(handle, page_buffers(page), 0,
>                           PAGE_SIZE, NULL, do_journal_get_write_access)) {
>                         unlock_page(page);
> -                       ret = VM_FAULT_SIGBUS;
>                         ext4_journal_stop(handle);
>                         goto out;
>                 }
>                 ext4_set_inode_state(inode, EXT4_STATE_JDATA);
>         }
>         ext4_journal_stop(handle);
> -       if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
> +       if (ret == VM_FAULT_SIGBUS &&
> +               ext4_should_retry_alloc(inode->i_sb, &retries))
>                 goto retry_alloc;
>  out_ret:
> -       ret = block_page_mkwrite_return(ret);
> +       ret = block_page_mkwrite_return(err);
>  out:
>         up_read(&EXT4_I(inode)->i_mmap_sem);
>         sb_end_pagefault(inode->i_sb);
> diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
> index 96225a7..ed7a81b 100644
> --- a/include/linux/buffer_head.h
> +++ b/include/linux/buffer_head.h
> @@ -14,6 +14,7 @@
>  #include <linux/pagemap.h>
>  #include <linux/wait.h>
>  #include <linux/atomic.h>
> +#include <linux/mm_types.h>
>
>  #ifdef CONFIG_BLOCK
>
> @@ -242,7 +243,7 @@ int cont_write_begin(struct file *, struct address_space *, loff_t,
>  int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
>                                 get_block_t get_block);
>  /* Convert errno to return value from ->page_mkwrite() call */
> -static inline int block_page_mkwrite_return(int err)
> +static inline vm_fault_t block_page_mkwrite_return(int err)
>  {
>         if (err == 0)
>                 return VM_FAULT_LOCKED;
> --
> 1.9.1
>