Patch "smb3: Move the flush out of smb2_copychunk_range() into its callers" has been added to the 5.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    smb3: Move the flush out of smb2_copychunk_range() into its callers

to the 5.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     smb3-move-the-flush-out-of-smb2_copychunk_range-into.patch
and it can be found in the queue-5.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit dd21d6b9e45779fe64c07f4fa39a56502f2dc4eb
Author: David Howells <dhowells@xxxxxxxxxx>
Date:   Tue Aug 23 14:07:28 2022 +0100

    smb3: Move the flush out of smb2_copychunk_range() into its callers
    
    [ Upstream commit c3a72bb213209adfe981a4a92ea5746a778323e4 ]
    
    Move the flush out of smb2_copychunk_range() into its callers.  This will
    allow the pagecache to be invalidated between the flush and the operation
    in smb3_collapse_range() and smb3_insert_range().
    
    Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
    cc: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Stable-dep-of: fa30a81f255a ("smb3: fix temporary data corruption in collapse range")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 8f2e003e0590..2b51f0cbf4d2 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1203,6 +1203,8 @@ 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");
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index e8a8daa82ed7..ef8cb7fbabeb 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1886,17 +1886,8 @@ smb2_copychunk_range(const unsigned int xid,
 	int chunks_copied = 0;
 	bool chunk_sizes_updated = false;
 	ssize_t bytes_written, total_bytes_written = 0;
-	struct inode *inode;
 
 	pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
-
-	/*
-	 * We need to flush all unwritten data before we can send the
-	 * copychunk ioctl to the server.
-	 */
-	inode = d_inode(trgtfile->dentry);
-	filemap_write_and_wait(inode->i_mapping);
-
 	if (pcchunk == NULL)
 		return -ENOMEM;
 
@@ -3977,6 +3968,8 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
 		goto out;
 	}
 
+	filemap_write_and_wait(inode->i_mapping);
+
 	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
 				  i_size_read(inode) - off - len, off);
 	if (rc < 0)
@@ -4004,18 +3997,21 @@ static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
 	int rc;
 	unsigned int xid;
 	struct cifsFileInfo *cfile = file->private_data;
+	struct inode *inode = file_inode(file);
 	__le64 eof;
 	__u64  count;
 
 	xid = get_xid();
 
-	if (off >= i_size_read(file->f_inode)) {
+	if (off >= i_size_read(inode)) {
 		rc = -EINVAL;
 		goto out;
 	}
 
-	count = i_size_read(file->f_inode) - off;
-	eof = cpu_to_le64(i_size_read(file->f_inode) + len);
+	count = i_size_read(inode) - off;
+	eof = cpu_to_le64(i_size_read(inode) + len);
+
+	filemap_write_and_wait(inode->i_mapping);
 
 	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 			  cfile->fid.volatile_fid, cfile->pid, &eof);