CEPH-Devel Archive on lore.kernel.org
 help / color / Atom feed
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
	ericvh@gmail.com, lucho@ionkov.net, viro@zeniv.linux.org.uk,
	jlayton@kernel.org, idryomov@gmail.com, mark@fasheh.com,
	jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
	v9fs-developer@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org,
	ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org,
	clm@fb.com, josef@toxicpanda.com, dsterba@suse.com,
	stable@vger.kernel.org
Subject: [PATCH 7/7] btrfs: Promote to unsigned long long before multiplying
Date: Sun,  4 Oct 2020 19:04:28 +0100
Message-ID: <20201004180428.14494-8-willy@infradead.org> (raw)
In-Reply-To: <20201004180428.14494-1-willy@infradead.org>

On 32-bit systems, these shifts will overflow for files larger than 4GB.
Add helper functions to avoid this problem coming back.

Cc: stable@vger.kernel.org
Fixes: 73ff61dbe5ed ("Btrfs: fix device replace of a missing RAID 5/6 device")
Fixes: be50a8ddaae1 ("Btrfs: Simplify scrub_setup_recheck_block()'s argument")
Fixes: ff023aac3119 ("Btrfs: add code to scrub to copy read data to another disk")
Fixes: b5d67f64f9bc ("Btrfs: change scrub to support big blocks")
Fixes: a2de733c78fa ("btrfs: scrub")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/btrfs/scrub.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 354ab9985a34..ccbaf9c6e87a 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1262,12 +1262,17 @@ static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type,
 	}
 }
 
+static u64 sblock_length(struct scrub_block *sblock)
+{
+	return (u64)sblock->page_count * PAGE_SIZE;
+}
+
 static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
 				     struct scrub_block *sblocks_for_recheck)
 {
 	struct scrub_ctx *sctx = original_sblock->sctx;
 	struct btrfs_fs_info *fs_info = sctx->fs_info;
-	u64 length = original_sblock->page_count * PAGE_SIZE;
+	u64 length = sblock_length(original_sblock);
 	u64 logical = original_sblock->pagev[0]->logical;
 	u64 generation = original_sblock->pagev[0]->generation;
 	u64 flags = original_sblock->pagev[0]->flags;
@@ -1610,6 +1615,11 @@ static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
 	}
 }
 
+static u64 sbio_length(struct scrub_bio *sbio)
+{
+	return (u64)sbio->page_count * PAGE_SIZE;
+}
+
 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
 					   int page_num)
 {
@@ -1659,10 +1669,9 @@ static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
 		bio->bi_iter.bi_sector = sbio->physical >> 9;
 		bio->bi_opf = REQ_OP_WRITE;
 		sbio->status = 0;
-	} else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
+	} else if (sbio->physical + sbio_length(sbio) !=
 		   spage->physical_for_dev_replace ||
-		   sbio->logical + sbio->page_count * PAGE_SIZE !=
-		   spage->logical) {
+		   sbio->logical + sbio_length(sbio) != spage->logical) {
 		scrub_wr_submit(sctx);
 		goto again;
 	}
@@ -2005,10 +2014,8 @@ static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
 		bio->bi_iter.bi_sector = sbio->physical >> 9;
 		bio->bi_opf = REQ_OP_READ;
 		sbio->status = 0;
-	} else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
-		   spage->physical ||
-		   sbio->logical + sbio->page_count * PAGE_SIZE !=
-		   spage->logical ||
+	} else if (sbio->physical + sbio_length(sbio) != spage->physical ||
+		   sbio->logical + sbio_length(sbio) != spage->logical ||
 		   sbio->dev != spage->dev) {
 		scrub_submit(sctx);
 		goto again;
@@ -2094,7 +2101,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
 {
 	struct scrub_ctx *sctx = sblock->sctx;
 	struct btrfs_fs_info *fs_info = sctx->fs_info;
-	u64 length = sblock->page_count * PAGE_SIZE;
+	u64 length = sblock_length(sblock);
 	u64 logical = sblock->pagev[0]->logical;
 	struct btrfs_bio *bbio = NULL;
 	struct bio *bio;
-- 
2.28.0


  parent reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-04 18:04 [PATCH 0/7] Fix a pile of 4GB file problems on 32-bit Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 1/7] 9P: Cast to loff_t before multiplying Matthew Wilcox (Oracle)
2020-10-07  5:48   ` Christoph Hellwig
2020-10-07 18:47     ` Matthew Wilcox
2020-10-26 17:14   ` Dominique Martinet
2020-10-04 18:04 ` [PATCH 2/7] buffer: Promote to unsigned long long before shifting Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 3/7] ceph: " Matthew Wilcox (Oracle)
2020-10-06 11:29   ` Jeff Layton
2020-10-06 17:20   ` Jeff Layton
2020-10-04 18:04 ` [PATCH 4/7] ocfs2: " Matthew Wilcox (Oracle)
2020-10-04 18:04 ` [PATCH 5/7] btrfs: " Matthew Wilcox (Oracle)
2020-10-09 14:18   ` Josef Bacik
2020-10-26 17:02   ` David Sterba
2020-10-04 18:04 ` [PATCH 6/7] " Matthew Wilcox (Oracle)
2020-10-09 14:18   ` Josef Bacik
2020-10-26 16:35   ` David Sterba
2020-10-26 16:44     ` Matthew Wilcox
2020-10-26 17:03       ` David Sterba
2020-10-04 18:04 ` Matthew Wilcox (Oracle) [this message]
2020-10-26 16:21   ` [PATCH 7/7] btrfs: Promote to unsigned long long before multiplying David Sterba

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201004180428.14494-8-willy@infradead.org \
    --to=willy@infradead.org \
    --cc=ceph-devel@vger.kernel.org \
    --cc=clm@fb.com \
    --cc=dsterba@suse.com \
    --cc=ericvh@gmail.com \
    --cc=idryomov@gmail.com \
    --cc=jlayton@kernel.org \
    --cc=jlbec@evilplan.org \
    --cc=josef@toxicpanda.com \
    --cc=joseph.qi@linux.alibaba.com \
    --cc=linux-btrfs@vger.kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lucho@ionkov.net \
    --cc=mark@fasheh.com \
    --cc=ocfs2-devel@oss.oracle.com \
    --cc=stable@vger.kernel.org \
    --cc=v9fs-developer@lists.sourceforge.net \
    --cc=viro@zeniv.linux.org.uk \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

CEPH-Devel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/ceph-devel/0 ceph-devel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 ceph-devel ceph-devel/ https://lore.kernel.org/ceph-devel \
		ceph-devel@vger.kernel.org
	public-inbox-index ceph-devel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.ceph-devel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git