linux-kernel - [PATCH] ceph: Fix incorrect flush end position calculation

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Message-ID: <1243044.1741776431@warthog.procyon.org.uk>
Date: Wed, 12 Mar 2025 10:47:11 +0000
From: David Howells <dhowells@...hat.com>
To: Viacheslav Dubeyko <slava@...eyko.com>
cc: dhowells@...hat.com, Alex Markuze <amarkuze@...hat.com>,
    Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
    Christian Brauner <brauner@...nel.org>, ceph-devel@...r.kernel.org,
    linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ceph: Fix incorrect flush end position calculation

In ceph, in fill_fscrypt_truncate(), the end flush position is calculated
by:

                loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;

but that's using the block shift not the block size.

Fix this to use the block size instead.

Fixes: 5c64737d2536 ("ceph: add truncate size handling support for fscrypt")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Viacheslav Dubeyko <slava@...eyko.com>
cc: Alex Markuze <amarkuze@...hat.com>
cc: Xiubo Li <xiubli@...hat.com>
cc: Ilya Dryomov <idryomov@...il.com>
cc: ceph-devel@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
---
 fs/ceph/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index ab63c7ebce5b..ec9b80fec7be 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2363,7 +2363,7 @@ static int fill_fscrypt_truncate(struct inode *inode,
 
 	/* Try to writeback the dirty pagecaches */
 	if (issued & (CEPH_CAP_FILE_BUFFER)) {
-		loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1;
+		loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SIZE - 1;
 
 		ret = filemap_write_and_wait_range(inode->i_mapping,
 						   orig_pos, lend);