CIFS: Implement cifs_strict_fsync

Invalidate inode mapping if we don't have at least Level II oplock in
cifs_strict_fsync. Also remove filemap_write_and_wait call from cifs_fsync
because it is previously called from vfs_fsync_range. Add file operations'
structures for strict cache mode.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 6c9ee8014ff0..8852470b4fbb 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -44,13 +44,17 @@ static void cifs_set_ops(struct inode *inode)
                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
                         else
                                 inode->i_fop = &cifs_file_direct_ops;
+                } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
+                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
+                                inode->i_fop = &cifs_file_strict_nobrl_ops;
+                        else
+                                inode->i_fop = &cifs_file_strict_ops;
                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
                         inode->i_fop = &cifs_file_nobrl_ops;
                 else { /* not direct, send byte range locks */
                         inode->i_fop = &cifs_file_ops;
                 }
 
-
                 /* check if server can support readpages */
                 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
@@ -1679,7 +1683,7 @@ cifs_inode_needs_reval(struct inode *inode)
 /*
  * Zap the cache. Called when invalid_mapping flag is set.
  */
-static void
+void
 cifs_invalidate_mapping(struct inode *inode)
 {
         int rc;