linux-kernel - [PATCH 5.19 013/207] smb3: use filemap_write_and_wait_range instead of filemap_write_and

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Date:   Mon, 26 Sep 2022 12:10:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Paulo Alcantara (SUSE)" <pc@....nz>,
        David Howells <dhowells@...hat.com>,
        Steve French <stfrench@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 013/207] smb3: use filemap_write_and_wait_range instead of filemap_write_and_wait

From: Steve French <stfrench@...rosoft.com>

[ Upstream commit 3e3761f1ec7df67d88cfca5e2ea98538f529e645 ]

When doing insert range and collapse range we should be
writing out the cached pages for the ranges affected but not
the whole file.

Fixes: c3a72bb21320 ("smb3: Move the flush out of smb2_copychunk_range() into its callers")
Cc: stable@...r.kernel.org
Reviewed-by: Paulo Alcantara (SUSE) <pc@....nz>
Reviewed-by: David Howells <dhowells@...hat.com>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/cifs/cifsfs.c  | 8 ++++++--
 fs/cifs/smb2ops.c | 9 +++++++--
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 2b51f0cbf4d2..97278c43f8dc 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1203,8 +1203,6 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
 
 	cifs_dbg(FYI, "copychunk range\n");
 
-	filemap_write_and_wait(src_inode->i_mapping);
-
 	if (!src_file->private_data || !dst_file->private_data) {
 		rc = -EBADF;
 		cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
@@ -1234,6 +1232,12 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
 	lock_two_nondirectories(target_inode, src_inode);
 
 	cifs_dbg(FYI, "about to flush pages\n");
+
+	rc = filemap_write_and_wait_range(src_inode->i_mapping, off,
+					  off + len - 1);
+	if (rc)
+		goto out;
+
 	/* should we flush first and last page first */
 	truncate_inode_pages(&target_inode->i_data, 0);
 
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 774c6e5f6584..cc180d37b8ce 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3970,7 +3970,10 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
 	}
 
 	filemap_invalidate_lock(inode->i_mapping);
-	filemap_write_and_wait(inode->i_mapping);
+	rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof - 1);
+	if (rc < 0)
+		goto out_2;
+
 	truncate_pagecache_range(inode, off, old_eof);
 
 	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
@@ -4021,7 +4024,9 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
 	eof = cpu_to_le64(old_eof + len);
 
 	filemap_invalidate_lock(inode->i_mapping);
-	filemap_write_and_wait(inode->i_mapping);
+	rc = filemap_write_and_wait_range(inode->i_mapping, off, old_eof + len - 1);
+	if (rc < 0)
+		goto out_2;
 	truncate_pagecache_range(inode, off, old_eof);
 
 	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
-- 
2.35.1