Patch "SMB3: Close deferred file handles in case of handle lease break" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    SMB3: Close deferred file handles in case of handle lease break

to the 5.15-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-close-deferred-file-handles-in-case-of-handle-l.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 9c039b9806b68a2b6a41816c288b0ff620a50ec6
Author: Bharath SM <bharathsm@xxxxxxxxxxxxx>
Date:   Wed Apr 26 14:05:16 2023 +0000

    SMB3: Close deferred file handles in case of handle lease break
    
    [ Upstream commit d906be3fa571f6fc9381911304a0eca99f1b6951 ]
    
    We should not cache deferred file handles if we dont have
    handle lease on a file. And we should immediately close all
    deferred handles in case of handle lease break.
    
    Fixes: 9e31678fb403 ("SMB3: fix lease break timeout when multiple deferred close handles for the same file.")
    Signed-off-by: Bharath SM <bharathsm@xxxxxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index b3cf9ab50139d..ebf2877dbe76c 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -4870,6 +4870,8 @@ void cifs_oplock_break(struct work_struct *work)
 	struct TCP_Server_Info *server = tcon->ses->server;
 	int rc = 0;
 	bool purge_cache = false;
+	struct cifs_deferred_close *dclose;
+	bool is_deferred = false;
 
 	wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS,
 			TASK_UNINTERRUPTIBLE);
@@ -4905,6 +4907,20 @@ void cifs_oplock_break(struct work_struct *work)
 		cifs_dbg(VFS, "Push locks rc = %d\n", rc);
 
 oplock_break_ack:
+	/*
+	 * When oplock break is received and there are no active
+	 * file handles but cached, then schedule deferred close immediately.
+	 * So, new open will not use cached handle.
+	 */
+	spin_lock(&CIFS_I(inode)->deferred_lock);
+	is_deferred = cifs_is_deferred_close(cfile, &dclose);
+	spin_unlock(&CIFS_I(inode)->deferred_lock);
+
+	if (!CIFS_CACHE_HANDLE(cinode) && is_deferred &&
+			cfile->deferred_close_scheduled && delayed_work_pending(&cfile->deferred)) {
+		cifs_close_deferred_file(cinode);
+	}
+
 	/*
 	 * releasing stale oplock after recent reconnect of smb session using
 	 * a now incorrect file handle is not a data integrity issue but do
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 15e8ae31ffbc9..5e4dab5dfb7a3 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -748,7 +748,7 @@ cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode)
 	spin_unlock(&cifs_inode->open_file_lock);
 
 	list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) {
-		_cifsFileInfo_put(tmp_list->cfile, true, false);
+		_cifsFileInfo_put(tmp_list->cfile, false, false);
 		list_del(&tmp_list->list);
 		kfree(tmp_list);
 	}