[PATCH 3/3] gfs2: Convert stuffed_readpage() to stuffed_read_folio()

Matthew Wilcox (Oracle)
2023-11-07T21:26:52Z

Use folio_fill_tail() to implement the unstuffing and folio_end_read()
to simultaneously mark the folio uptodate and unlock it. Unifies a
couple of code paths.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/gfs2/aops.c | 37 +++++++++++++++++--------------------
1 file changed, 17 insertions(+), 20 deletions(-)

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 9611bfceda4b..ba8742dc91f8 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -403,18 +403,18 @@ static int gfs2_jdata_writepages(struct address_space *mapping,
}

/**
- * stuffed_readpage - Fill in a Linux folio with stuffed file data
+ * stuffed_read_folio - Fill in a Linux folio with stuffed file data
* @ip: the inode
* @folio: the folio
*
* Returns: errno
*/
-static int stuffed_readpage(struct gfs2_inode *ip, struct folio *folio)
+static int stuffed_read_folio(struct gfs2_inode *ip, struct folio *folio)
{
- struct buffer_head *dibh;
- size_t i_size = i_size_read(&ip->i_inode);
- void *data;
- int error;
+ struct buffer_head *dibh = NULL;
+ size_t dsize = i_size_read(&ip->i_inode);
+ void *from = NULL;
+ int error = 0;

/*
* Due to the order of unstuffing files and ->fault(), we can be
@@ -422,22 +422,20 @@ static int stuffed_readpage(struct gfs2_inode *ip, struct folio *folio)
* so we need to supply one here. It doesn't happen often.
*/
if (unlikely(folio->index)) {
- folio_zero_range(folio, 0, folio_size(folio));
- folio_mark_uptodate(folio);
- return 0;
+ dsize = 0;
+ } else {
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+ from = dibh->b_data + sizeof(struct gfs2_dinode);
}

- error = gfs2_meta_inode_buffer(ip, &dibh);
- if (error)
- return error;
-
- data = dibh->b_data + sizeof(struct gfs2_dinode);
- memcpy_to_folio(folio, 0, data, i_size);
- folio_zero_range(folio, i_size, folio_size(folio) - i_size);
+ folio_fill_tail(folio, 0, from, dsize);
brelse(dibh);
- folio_mark_uptodate(folio);
+out:
+ folio_end_read(folio, error == 0);

- return 0;
+ return error;
}

/**
@@ -456,8 +454,7 @@ static int gfs2_read_folio(struct file *file, struct folio *folio)
(i_blocksize(inode) == PAGE_SIZE && !folio_buffers(folio))) {
error = iomap_read_folio(folio, &gfs2_iomap_ops);
} else if (gfs2_is_stuffed(ip)) {
- error = stuffed_readpage(ip, folio);
- folio_unlock(folio);
+ error = stuffed_read_folio(ip, folio);
} else {
error = mpage_read_folio(folio, gfs2_block_map);
}
--
2.42.0