Re: [PATCH 17/20] filemap: consistently use ->f_mapping over ->i_mapping

[Jan Kara <jack@xxxxxxx>]

On Wed 18-11-20 09:47:57, Christoph Hellwig wrote:
> Use file->f_mapping in all remaining places that have a struct file
> available to properly handle the case where inode->i_mapping !=
> file_inode(file)->i_mapping.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@xxxxxxx>

                                                                Honza

> ---
>  mm/filemap.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/filemap.c b/mm/filemap.c
> index d5e7c2029d16b4..3e3531a757f8db 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2887,13 +2887,13 @@ EXPORT_SYMBOL(filemap_map_pages);
>  vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf)
>  {
>       struct page *page = vmf->page;
> -     struct inode *inode = file_inode(vmf->vma->vm_file);
> +     struct inode *inode = vmf->vma->vm_file->f_mapping->host;
>       vm_fault_t ret = VM_FAULT_LOCKED;
>  
>       sb_start_pagefault(inode->i_sb);
>       file_update_time(vmf->vma->vm_file);
>       lock_page(page);
> -     if (page->mapping != inode->i_mapping) {
> +     if (page->mapping != vmf->vma->vm_file->f_mapping) {
>               unlock_page(page);
>               ret = VM_FAULT_NOPAGE;
>               goto out;
> @@ -3149,10 +3149,9 @@ void dio_warn_stale_pagecache(struct file *filp)
>  {
>       static DEFINE_RATELIMIT_STATE(_rs, 86400 * HZ, DEFAULT_RATELIMIT_BURST);
>       char pathname[128];
> -     struct inode *inode = file_inode(filp);
>       char *path;
>  
> -     errseq_set(&inode->i_mapping->wb_err, -EIO);
> +     errseq_set(&filp->f_mapping->wb_err, -EIO);
>       if (__ratelimit(&_rs)) {
>               path = file_path(filp, pathname, sizeof(pathname));
>               if (IS_ERR(path))
> @@ -3179,7 +3178,7 @@ generic_file_direct_write(struct kiocb *iocb, struct 
> iov_iter *from)
>  
>       if (iocb->ki_flags & IOCB_NOWAIT) {
>               /* If there are pages to writeback, return */
> -             if (filemap_range_has_page(inode->i_mapping, pos,
> +             if (filemap_range_has_page(file->f_mapping, pos,
>                                          pos + write_len - 1))
>                       return -EAGAIN;
>       } else {
> -- 
> 2.29.2
> 
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR