[v20,61/71] ceph: invalidate pages when doing direct/sync writes

Commit Message

Xiubo Li June 13, 2023, 5:24 a.m. UTC

From: Luís Henriques <[e-mail]>

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 ]

Tested-by: Luís Henriques <[e-mail]>
Tested-by: Venky Shankar <[e-mail]>
Signed-off-by: Luís Henriques <[e-mail]>
Reviewed-by: Xiubo Li <[e-mail]>
Signed-off-by: Jeff Layton <[e-mail]>
---
 fs/ceph/file.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

Patch

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 0adaa89d0604..317087ea017e 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1632,11 +1632,6 @@  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;
@@ -1962,6 +1957,20 @@  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);