@@ -1341,7 +1341,6 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
struct cifsFileInfo *smb_file_target;
struct cifs_tcon *src_tcon;
struct cifs_tcon *target_tcon;
- unsigned long long destend, fstart, fend;
ssize_t rc;
cifs_dbg(FYI, "copychunk range\n");
@@ -1391,25 +1390,13 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
goto unlock;
}
- destend = destoff + len - 1;
-
- /* Flush the folios at either end of the destination range to prevent
- * accidental loss of dirty data outside of the range.
+ /* Flush and invalidate all the folios in the destination region. If
+ * the copy was successful, then some of the flush is extra overhead,
+ * but we need to allow for the copy failing in some way (eg. ENOSPC).
*/
- fstart = destoff;
- fend = destend;
-
- rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true);
+ rc = filemap_invalidate_inode(target_inode, true, destoff, destoff + len - 1);
if (rc)
goto unlock;
- rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false);
- if (rc)
- goto unlock;
- if (fend > target_cifsi->netfs.zero_point)
- target_cifsi->netfs.zero_point = fend + 1;
-
- /* Discard all the folios that overlap the destination region. */
- truncate_inode_pages_range(&target_inode->i_data, fstart, fend);
fscache_invalidate(cifs_inode_cookie(target_inode), NULL,
i_size_read(target_inode), 0);
Fix cifs_file_copychunk_range() to flush the destination region before invalidating it to avoid potential loss of data should the copy fail, in whole or in part, in some way. Fixes: 7b2404a886f8 ("cifs: Fix flushing, invalidation and file size with copy_file_range()") Signed-off-by: David Howells <dhowells@redhat.com> cc: Steve French <stfrench@microsoft.com> cc: Paulo Alcantara <pc@manguebit.com> cc: Shyam Prasad N <nspmangalore@gmail.com> cc: Rohith Surabattula <rohiths.msft@gmail.com> cc: Matthew Wilcox <willy@infradead.org> cc: Jeff Layton <jlayton@kernel.org> cc: linux-cifs@vger.kernel.org cc: linux-mm@kvack.org cc: linux-fsdevel@vger.kernel.org --- fs/smb/client/cifsfs.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-)