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Message-Id: <20230713035512.4139457-4-willy@infradead.org>
Date: Thu, 13 Jul 2023 04:55:08 +0100
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
David Sterba <dsterba@...e.com>, linux-fsdevel@...r.kernel.org,
Pankaj Raghav <p.raghav@...sung.com>,
Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
ntfs3@...ts.linux.dev, "Theodore Tso" <tytso@....edu>,
Jan Kara <jack@...e.com>, linux-ext4@...r.kernel.org
Subject: [PATCH 3/7] affs: Convert data read and write to use folios
We still need to convert to/from folios in write_begin & write_end
to fit the API, but this removes a lot of calls to old page-based
functions, removing many hidden calls to compound_head().
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
fs/affs/file.c | 77 +++++++++++++++++++++++++-------------------------
1 file changed, 38 insertions(+), 39 deletions(-)
diff --git a/fs/affs/file.c b/fs/affs/file.c
index e43f2f007ac1..705e227ff63d 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -520,21 +520,20 @@ affs_getemptyblk_ino(struct inode *inode, int block)
return ERR_PTR(err);
}
-static int
-affs_do_readpage_ofs(struct page *page, unsigned to, int create)
+static int affs_do_read_folio_ofs(struct folio *folio, size_t to, int create)
{
- struct inode *inode = page->mapping->host;
+ struct inode *inode = folio->mapping->host;
struct super_block *sb = inode->i_sb;
struct buffer_head *bh;
- unsigned pos = 0;
- u32 bidx, boff, bsize;
+ size_t pos = 0;
+ size_t bidx, boff, bsize;
u32 tmp;
- pr_debug("%s(%lu, %ld, 0, %d)\n", __func__, inode->i_ino,
- page->index, to);
- BUG_ON(to > PAGE_SIZE);
+ pr_debug("%s(%lu, %ld, 0, %zu)\n", __func__, inode->i_ino,
+ folio->index, to);
+ BUG_ON(to > folio_size(folio));
bsize = AFFS_SB(sb)->s_data_blksize;
- tmp = page->index << PAGE_SHIFT;
+ tmp = folio_pos(folio);
bidx = tmp / bsize;
boff = tmp % bsize;
@@ -544,7 +543,7 @@ affs_do_readpage_ofs(struct page *page, unsigned to, int create)
return PTR_ERR(bh);
tmp = min(bsize - boff, to - pos);
BUG_ON(pos + tmp > to || tmp > bsize);
- memcpy_to_page(page, pos, AFFS_DATA(bh) + boff, tmp);
+ memcpy_to_folio(folio, pos, AFFS_DATA(bh) + boff, tmp);
affs_brelse(bh);
bidx++;
pos += tmp;
@@ -624,25 +623,23 @@ affs_extent_file_ofs(struct inode *inode, u32 newsize)
return PTR_ERR(bh);
}
-static int
-affs_read_folio_ofs(struct file *file, struct folio *folio)
+static int affs_read_folio_ofs(struct file *file, struct folio *folio)
{
- struct page *page = &folio->page;
- struct inode *inode = page->mapping->host;
- u32 to;
+ struct inode *inode = folio->mapping->host;
+ size_t to;
int err;
- pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, page->index);
- to = PAGE_SIZE;
- if (((page->index + 1) << PAGE_SHIFT) > inode->i_size) {
- to = inode->i_size & ~PAGE_MASK;
- memset(page_address(page) + to, 0, PAGE_SIZE - to);
+ pr_debug("%s(%lu, %ld)\n", __func__, inode->i_ino, folio->index);
+ to = folio_size(folio);
+ if (folio_pos(folio) + to > inode->i_size) {
+ to = inode->i_size - folio_pos(folio);
+ folio_zero_segment(folio, to, folio_size(folio));
}
- err = affs_do_readpage_ofs(page, to, 0);
+ err = affs_do_read_folio_ofs(folio, to, 0);
if (!err)
- SetPageUptodate(page);
- unlock_page(page);
+ folio_mark_uptodate(folio);
+ folio_unlock(folio);
return err;
}
@@ -651,7 +648,7 @@ static int affs_write_begin_ofs(struct file *file, struct address_space *mapping
struct page **pagep, void **fsdata)
{
struct inode *inode = mapping->host;
- struct page *page;
+ struct folio *folio;
pgoff_t index;
int err = 0;
@@ -667,19 +664,20 @@ static int affs_write_begin_ofs(struct file *file, struct address_space *mapping
}
index = pos >> PAGE_SHIFT;
- page = grab_cache_page_write_begin(mapping, index);
- if (!page)
- return -ENOMEM;
- *pagep = page;
+ folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
+ mapping_gfp_mask(mapping));
+ if (IS_ERR(folio))
+ return PTR_ERR(folio);
+ *pagep = &folio->page;
- if (PageUptodate(page))
+ if (folio_test_uptodate(folio))
return 0;
/* XXX: inefficient but safe in the face of short writes */
- err = affs_do_readpage_ofs(page, PAGE_SIZE, 1);
+ err = affs_do_read_folio_ofs(folio, folio_size(folio), 1);
if (err) {
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
}
return err;
}
@@ -688,6 +686,7 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
+ struct folio *folio = page_folio(page);
struct inode *inode = mapping->host;
struct super_block *sb = inode->i_sb;
struct buffer_head *bh, *prev_bh;
@@ -701,18 +700,18 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
to = from + len;
/*
* XXX: not sure if this can handle short copies (len < copied), but
- * we don't have to, because the page should always be uptodate here,
+ * we don't have to, because the folio should always be uptodate here,
* due to write_begin.
*/
pr_debug("%s(%lu, %llu, %llu)\n", __func__, inode->i_ino, pos,
pos + len);
bsize = AFFS_SB(sb)->s_data_blksize;
- data = page_address(page);
+ data = folio_address(folio);
bh = NULL;
written = 0;
- tmp = (page->index << PAGE_SHIFT) + from;
+ tmp = (folio->index << PAGE_SHIFT) + from;
bidx = tmp / bsize;
boff = tmp % bsize;
if (boff) {
@@ -804,11 +803,11 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
from += tmp;
bidx++;
}
- SetPageUptodate(page);
+ folio_mark_uptodate(folio);
done:
affs_brelse(bh);
- tmp = (page->index << PAGE_SHIFT) + from;
+ tmp = (folio->index << PAGE_SHIFT) + from;
if (tmp > inode->i_size)
inode->i_size = AFFS_I(inode)->mmu_private = tmp;
@@ -819,8 +818,8 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
}
err_first_bh:
- unlock_page(page);
- put_page(page);
+ folio_unlock(folio);
+ folio_put(folio);
return written;
--
2.39.2
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