linux-ext4 - [PATCH -next RFC 10/14] erofs: use bdev api

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20231205123728.1866699-11-yukuai1@huaweicloud.com>
Date: Tue,  5 Dec 2023 20:37:24 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: axboe@...nel.dk,
	roger.pau@...rix.com,
	colyli@...e.de,
	kent.overstreet@...il.com,
	joern@...ybastard.org,
	miquel.raynal@...tlin.com,
	richard@....at,
	vigneshr@...com,
	sth@...ux.ibm.com,
	hoeppner@...ux.ibm.com,
	hca@...ux.ibm.com,
	gor@...ux.ibm.com,
	agordeev@...ux.ibm.com,
	jejb@...ux.ibm.com,
	martin.petersen@...cle.com,
	clm@...com,
	josef@...icpanda.com,
	dsterba@...e.com,
	nico@...xnic.net,
	xiang@...nel.org,
	chao@...nel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	agruenba@...hat.com,
	jack@...e.com,
	konishi.ryusuke@...il.com,
	willy@...radead.org,
	akpm@...ux-foundation.org,
	hare@...e.de,
	p.raghav@...sung.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org,
	linux-bcache@...r.kernel.org,
	linux-mtd@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	linux-bcachefs@...r.kernel.org,
	linux-btrfs@...r.kernel.org,
	linux-erofs@...ts.ozlabs.org,
	linux-ext4@...r.kernel.org,
	gfs2@...ts.linux.dev,
	linux-nilfs@...r.kernel.org,
	yukuai3@...wei.com,
	yukuai1@...weicloud.com,
	yi.zhang@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH -next RFC 10/14] erofs: use bdev api

From: Yu Kuai <yukuai3@...wei.com>

Avoid to access bd_inode directly, prepare to remove bd_inode from
block_devcie.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 fs/erofs/data.c     | 17 +++++++++++------
 fs/erofs/internal.h |  1 +
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/fs/erofs/data.c b/fs/erofs/data.c
index c98aeda8abb2..b9d2c90f9b22 100644
--- a/fs/erofs/data.c
+++ b/fs/erofs/data.c
@@ -32,8 +32,8 @@ void erofs_put_metabuf(struct erofs_buf *buf)
 void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
 		  enum erofs_kmap_type type)
 {
-	struct inode *inode = buf->inode;
-	erofs_off_t offset = (erofs_off_t)blkaddr << inode->i_blkbits;
+	u8 blkbits = buf->inode ? buf->inode->i_blkbits : block_bits(buf->bdev);
+	erofs_off_t offset = (erofs_off_t)blkaddr << blkbits;
 	pgoff_t index = offset >> PAGE_SHIFT;
 	struct page *page = buf->page;
 	struct folio *folio;
@@ -43,7 +43,9 @@ void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
 		erofs_put_metabuf(buf);
 
 		nofs_flag = memalloc_nofs_save();
-		folio = read_cache_folio(inode->i_mapping, index, NULL, NULL);
+		folio = buf->inode ?
+			read_mapping_folio(buf->inode->i_mapping, index, NULL) :
+			bdev_read_folio(buf->bdev, index);
 		memalloc_nofs_restore(nofs_flag);
 		if (IS_ERR(folio))
 			return folio;
@@ -67,10 +69,13 @@ void *erofs_bread(struct erofs_buf *buf, erofs_blk_t blkaddr,
 
 void erofs_init_metabuf(struct erofs_buf *buf, struct super_block *sb)
 {
-	if (erofs_is_fscache_mode(sb))
+	if (erofs_is_fscache_mode(sb)) {
 		buf->inode = EROFS_SB(sb)->s_fscache->inode;
-	else
-		buf->inode = sb->s_bdev->bd_inode;
+		buf->bdev = NULL;
+	} else {
+		buf->inode = NULL;
+		buf->bdev = sb->s_bdev;
+	}
 }
 
 void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb,
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index b0409badb017..a68b0924c052 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -224,6 +224,7 @@ enum erofs_kmap_type {
 
 struct erofs_buf {
 	struct inode *inode;
+	struct block_device *bdev;
 	struct page *page;
 	void *base;
 	enum erofs_kmap_type kmap_type;
-- 
2.39.2