From 6344bc6cd2b446fb8cf83f979b1ca63cae647926 Mon Sep 17 00:00:00 2001
From: Rohith Surabattula <rohiths@microsoft.com>
Date: Fri, 17 Sep 2021 16:50:40 -0500
Subject: [PATCH] cifs: Not to defer close on file when lock is set
Git-commit: 35866f3f779aef5e7ba84e4d1023fe2e2a0e219e
Patch-mainline: v5.15-rc3
References: stable-5.14.9

commit 35866f3f779aef5e7ba84e4d1023fe2e2a0e219e upstream.

Close file immediately when lock is set.

Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Rohith Surabattula <rohiths@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 fs/cifs/cifsglob.h | 1 +
 fs/cifs/file.c     | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index c6a9542ca281..cf2141483b37 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1403,6 +1403,7 @@ struct cifsInodeInfo {
 #define CIFS_INO_INVALID_MAPPING	  (4) /* pagecache is invalid */
 #define CIFS_INO_LOCK			  (5) /* lock bit for synchronization */
 #define CIFS_INO_MODIFIED_ATTR            (6) /* Indicate change in mtime/ctime */
+#define CIFS_INO_CLOSE_ON_LOCK            (7) /* Not to defer the close when lock is set */
 	unsigned long flags;
 	spinlock_t writers_lock;
 	unsigned int writers;		/* Number of writers on this inode */
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index bb98fbdd22a9..9d3bc6784771 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -881,6 +881,7 @@ int cifs_close(struct inode *inode, struct file *file)
 		dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL);
 		if ((cinode->oplock == CIFS_CACHE_RHW_FLG) &&
 		    cinode->lease_granted &&
+		    !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) &&
 		    dclose) {
 			if (test_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags))
 				inode->i_ctime = inode->i_mtime = current_time(inode);
@@ -1861,6 +1862,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
 	cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag,
 			tcon->ses->server);
 	cifs_sb = CIFS_FILE_SB(file);
+	set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags);
 
 	if (cap_unix(tcon->ses) &&
 	    (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
-- 
2.26.2