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romfs: Convert romfs_read_folio() to use a folio

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Remove the conversion back to struct page and use the folio APIs instead
of the page APIs.  It's probably more trouble than it's worth to support
large folios in romfs, so there are still PAGE_SIZE assumptions in
this function.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240530202110.2653630-13-willy@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-05-30 21:21:04 +01:00 committed by Christian Brauner
parent f4c51473d2
commit d86f2de026
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 16 deletions
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22
fs/romfs/super.c
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@ -101,19 +101,15 @@ static struct inode *romfs_iget(struct super_block *sb, unsigned long pos);
*/
static int romfs_read_folio(struct file *file, struct folio *folio)
{
struct page *page = &folio->page;
struct inode *inode = page->mapping->host;
struct inode *inode = folio->mapping->host;
loff_t offset, size;
unsigned long fillsize, pos;
void *buf;
int ret;
buf = kmap(page);
if (!buf)
return -ENOMEM;
buf = kmap_local_folio(folio, 0);
/* 32 bit warning -- but not for us :) */
offset = page_offset(page);
offset = folio_pos(folio);
size = i_size_read(inode);
fillsize = 0;
ret = 0;
@ -125,20 +121,14 @@ static int romfs_read_folio(struct file *file, struct folio *folio)
ret = romfs_dev_read(inode->i_sb, pos, buf, fillsize);
if (ret < 0) {
SetPageError(page);
fillsize = 0;
ret = -EIO;
}
}
if (fillsize < PAGE_SIZE)
memset(buf + fillsize, 0, PAGE_SIZE - fillsize);
if (ret == 0)
SetPageUptodate(page);
flush_dcache_page(page);
kunmap(page);
unlock_page(page);
buf = folio_zero_tail(folio, fillsize, buf);
kunmap_local(buf);
folio_end_read(folio, ret == 0);
return ret;
}