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iomap: Convert iomap_page_mkwrite to use a folio 

If we write to any page in a folio, we have to mark the entire
folio as dirty, and potentially COW the entire folio, because it'll
all get written back as one unit.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-04-28 22:32:02 -04:00
parent 3aa9c659bf
commit ea0f843aa7
1 changed files with 12 additions and 13 deletions
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25
fs/iomap/buffered-io.c
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@ -967,10 +967,9 @@ iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
}
EXPORT_SYMBOL_GPL(iomap_truncate_page);
static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter,
struct page *page)
static loff_t iomap_folio_mkwrite_iter(struct iomap_iter *iter,
struct folio *folio)
{
struct folio *folio = page_folio(page);
loff_t length = iomap_length(iter);
int ret;
@ -979,10 +978,10 @@ static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter,
&iter->iomap);
if (ret)
return ret;
block_commit_write(page, 0, length);
block_commit_write(&folio->page, 0, length);
} else {
WARN_ON_ONCE(!PageUptodate(page));
set_page_dirty(page);
WARN_ON_ONCE(!folio_test_uptodate(folio));
folio_mark_dirty(folio);
}
return length;
@ -994,24 +993,24 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
.inode = file_inode(vmf->vma->vm_file),
.flags = IOMAP_WRITE | IOMAP_FAULT,
};
struct page *page = vmf->page;
struct folio *folio = page_folio(vmf->page);
ssize_t ret;
lock_page(page);
ret = page_mkwrite_check_truncate(page, iter.inode);
folio_lock(folio);
ret = folio_mkwrite_check_truncate(folio, iter.inode);
if (ret < 0)
goto out_unlock;
iter.pos = page_offset(page);
iter.pos = folio_pos(folio);
iter.len = ret;
while ((ret = iomap_iter(&iter, ops)) > 0)
iter.processed = iomap_page_mkwrite_iter(&iter, page);
iter.processed = iomap_folio_mkwrite_iter(&iter, folio);
if (ret < 0)
goto out_unlock;
wait_for_stable_page(page);
folio_wait_stable(folio);
return VM_FAULT_LOCKED;
out_unlock:
unlock_page(page);
folio_unlock(folio);
return block_page_mkwrite_return(ret);
}
EXPORT_SYMBOL_GPL(iomap_page_mkwrite);