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fs: Convert block_write_begin() to use a folio

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Use the folio APIs to retrieve the folio from the page cache and
manipulate it.  Saves a few conversions between pages & folios.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-04-16 23:58:48 -04:00 committed by Christian Brauner
parent 0551bc716e
commit 8eb835a136
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 10 additions and 9 deletions
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19
fs/buffer.c
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@ -2225,21 +2225,22 @@ int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
struct page **pagep, get_block_t *get_block)
{
pgoff_t index = pos >> PAGE_SHIFT;
struct page *page;
struct folio *folio;
int status;
page = grab_cache_page_write_begin(mapping, index);
if (!page)
return -ENOMEM;
folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
mapping_gfp_mask(mapping));
if (IS_ERR(folio))
return PTR_ERR(folio);
status = __block_write_begin(page, pos, len, get_block);
status = __block_write_begin_int(folio, pos, len, get_block, NULL);
if (unlikely(status)) {
unlock_page(page);
put_page(page);
page = NULL;
folio_unlock(folio);
folio_put(folio);
folio = NULL;
}
*pagep = page;
*pagep = &folio->page;
return status;
}
EXPORT_SYMBOL(block_write_begin);