linux-kernel - [PATCH v2] ceph: invalidate pages when doing DIO in encrypted inodes

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Message-Id: <20220401133243.1075-1-lhenriques@suse.de>
Date:   Fri,  1 Apr 2022 14:32:43 +0100
From:   Luís Henriques <lhenriques@...e.de>
To:     Jeff Layton <jlayton@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Luís Henriques <lhenriques@...e.de>
Subject: [PATCH v2] ceph: invalidate pages when doing DIO in encrypted inodes

When doing DIO on an encrypted node, we need to invalidate the page cache in
the range being written to, otherwise the cache will include invalid data.

Signed-off-by: Luís Henriques <lhenriques@...e.de>
---
 fs/ceph/file.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

Changes since v1:
- Replaced truncate_inode_pages_range() by invalidate_inode_pages2_range
- Call fscache_invalidate with FSCACHE_INVAL_DIO_WRITE if we're doing DIO

Note: I'm not really sure this last change is required, it doesn't really
affect generic/647 result, but seems to be the most correct.

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 5072570c2203..b2743c342305 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1605,7 +1605,7 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
 	if (ret < 0)
 		return ret;
 
-	ceph_fscache_invalidate(inode, false);
+	ceph_fscache_invalidate(inode, (iocb->ki_flags & IOCB_DIRECT));
 	ret = invalidate_inode_pages2_range(inode->i_mapping,
 					    pos >> PAGE_SHIFT,
 					    (pos + count - 1) >> PAGE_SHIFT);
@@ -1895,6 +1895,15 @@ ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
 		req->r_inode = inode;
 		req->r_mtime = mtime;
 
+		if (IS_ENCRYPTED(inode) && (iocb->ki_flags & IOCB_DIRECT)) {
+			ret = invalidate_inode_pages2_range(
+				inode->i_mapping,
+				write_pos >> PAGE_SHIFT,
+				(write_pos + write_len - 1) >> PAGE_SHIFT);
+			if (ret < 0)
+				dout("invalidate_inode_pages2_range returned %d\n", ret);
+		}
+
 		/* Set up the assertion */
 		if (rmw) {
 			/*