[PATCH v3 1/8] fs/buffer: simplify block_read_full_folio() with bh_offset()

Luis Chamberlain
2025-02-21T22:38:29Z

When we read over all buffers in a folio we currently use the
buffer index on the folio and blocksize to get the offset. Simplify
this with bh_offset(). This simplifies the loop while making no
functional changes.

Suggested-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
fs/buffer.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index cc8452f60251..b99560e8a142 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2381,7 +2381,6 @@ int block_read_full_folio(struct folio *folio, get_block_t *get_block)
lblock = div_u64(limit + blocksize - 1, blocksize);
bh = head;
nr = 0;
- i = 0;

do {
if (buffer_uptodate(bh))
@@ -2398,7 +2397,7 @@ int block_read_full_folio(struct folio *folio, get_block_t *get_block)
page_error = true;
}
if (!buffer_mapped(bh)) {
- folio_zero_range(folio, i * blocksize,
+ folio_zero_range(folio, bh_offset(bh),
blocksize);
if (!err)
set_buffer_uptodate(bh);
@@ -2412,7 +2411,7 @@ int block_read_full_folio(struct folio *folio, get_block_t *get_block)
continue;
}
arr[nr++] = bh;
- } while (i++, iblock++, (bh = bh->b_this_page) != head);
+ } while (iblock++, (bh = bh->b_this_page) != head);

if (fully_mapped)
folio_set_mappedtodisk(folio);
--
2.47.2