diff mbox series

[v15,24/29] ceph: invalidate pages when doing direct/sync writes

Message ID 20220825133132.153657-25-jlayton@kernel.org
State New
Headers show
Series ceph: remaining patches for fscrypt support | expand

Commit Message

Jeff Layton Aug. 25, 2022, 1:31 p.m. UTC 
From: Luís Henriques <lhenriques@suse.de>

When doing a direct/sync write, we need to invalidate the page cache in
the range being written to. If we don't do this, the cache will include
invalid data as we just did a write that avoided the page cache.

In the event that invalidation fails, just ignore the error. That likely
just means that we raced with another task doing a buffered write, in
which case we want to leave the page intact anyway.

[ jlayton: minor comment update ]

Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/file.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 3ebdc43959a4..537638abcb03 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1625,11 +1625,6 @@  ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
 		return ret;
 
 	ceph_fscache_invalidate(inode, false);
-	ret = invalidate_inode_pages2_range(inode->i_mapping,
-					    pos >> PAGE_SHIFT,
-					    (pos + count - 1) >> PAGE_SHIFT);
-	if (ret < 0)
-		dout("invalidate_inode_pages2_range returned %d\n", ret);
 
 	while ((len = iov_iter_count(from)) > 0) {
 		size_t left;
@@ -1955,6 +1950,20 @@  ceph_sync_write(struct kiocb *iocb, struct iov_iter *from, loff_t pos,
 		}
 
 		ceph_clear_error_write(ci);
+
+		/*
+		 * We successfully wrote to a range of the file. Declare
+		 * that region of the pagecache invalid.
+		 */
+		ret = invalidate_inode_pages2_range(
+				inode->i_mapping,
+				pos >> PAGE_SHIFT,
+				(pos + len - 1) >> PAGE_SHIFT);
+		if (ret < 0) {
+			dout("invalidate_inode_pages2_range returned %d\n",
+			     ret);
+			ret = 0;
+		}
 		pos += len;
 		written += len;
 		dout("sync_write written %d\n", written);