smb3: use filemap_write_and_wait_range instead of filemap_write_and_wait

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@vger.kernel.org
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index e9fb338..8042d72 100644 (file)
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1219,8 +1219,6 @@ 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");
@@ -1250,6 +1248,12 @@ 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 7c941ce..421be43 100644 (file)
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3687,7 +3687,10 @@ 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,
@@ -3738,7 +3741,9 @@ 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,