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filemap: Convert filemap_read() to use a folio 

We know the pagevec always contains folios, but use page_folio() anyway
instead of casting.  Removes a few calls to legacy functions.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-31 22:22:19 -04:00
parent 78f426608f
commit d996fc7f61
1 changed files with 12 additions and 16 deletions
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28
mm/filemap.c
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@ -2668,30 +2668,26 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter,
mark_page_accessed(pvec.pages[0]);
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
size_t page_size = thp_size(page);
size_t offset = iocb->ki_pos & (page_size - 1);
struct folio *folio = page_folio(pvec.pages[i]);
size_t fsize = folio_size(folio);
size_t offset = iocb->ki_pos & (fsize - 1);
size_t bytes = min_t(loff_t, end_offset - iocb->ki_pos,
page_size - offset);
fsize - offset);
size_t copied;
if (end_offset < page_offset(page))
if (end_offset < folio_pos(folio))
break;
if (i > 0)
mark_page_accessed(page);
folio_mark_accessed(folio);
/*
* If users can be writing to this page using arbitrary
* virtual addresses, take care about potential aliasing
* before reading the page on the kernel side.
* If users can be writing to this folio using arbitrary
* virtual addresses, take care of potential aliasing
* before reading the folio on the kernel side.
*/
if (writably_mapped) {
int j;
if (writably_mapped)
flush_dcache_folio(folio);
for (j = 0; j < thp_nr_pages(page); j++)
flush_dcache_page(page + j);
}
copied = copy_page_to_iter(page, offset, bytes, iter);
copied = copy_folio_to_iter(folio, offset, bytes, iter);
already_read += copied;
iocb->ki_pos += copied;