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ext4: Convert pagecache_read() to use a folio

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Use the folio API and support folios of arbitrary sizes.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20230324180129.1220691-29-willy@infradead.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Matthew Wilcox 2023-03-24 18:01:28 +00:00 committed by Theodore Ts'o
parent 3060b6ef05
commit b23fb76278
1 changed files with 7 additions and 9 deletions
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16
fs/ext4/verity.c
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@ -42,18 +42,16 @@ static int pagecache_read(struct inode *inode, void *buf, size_t count,
loff_t pos)
{
while (count) {
size_t n = min_t(size_t, count,
PAGE_SIZE - offset_in_page(pos));
struct page *page;
struct folio *folio;
size_t n;
page = read_mapping_page(inode->i_mapping, pos >> PAGE_SHIFT,
folio = read_mapping_folio(inode->i_mapping, pos >> PAGE_SHIFT,
NULL);
if (IS_ERR(page))
return PTR_ERR(page);
if (IS_ERR(folio))
return PTR_ERR(folio);
memcpy_from_page(buf, page, offset_in_page(pos), n);
put_page(page);
n = memcpy_from_file_folio(buf, folio, pos, count);
folio_put(folio);
buf += n;
pos += n;