[PATCH 76/78] filemap: use ->f_mapping over ->i_mapping consistently

[Christoph Hellwig <hch@xxxxxx>]

Use file->f_mapping in all functions that have a struct file available
to properly handle the case where file_inode(file)->i_mapping !=
inode->i_mapping.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 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