From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 7 Aug 2014 11:32:06 +0000 (-0400)
Subject: drop ->s_umount around acct_auto_close()
X-Git-Tag: firefly_0821_release~176^2~3412^2~29
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0aec09d049d7e994eba54bad4376dd8f58eab797;p=firefly-linux-kernel-4.4.55.git

drop ->s_umount around acct_auto_close()

just repeat the frozen check after regaining it, and check that sb
is still alive.  If several threads hit acct_auto_close() at the
same time, acct_auto_close() will survive that just fine.  And we
really don't want to play with writes and closing the file with
->s_umount held exclusive - it's a deadlock country.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/super.c b/fs/super.c
index 52ed93eb63df..a369f8964dc1 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -702,12 +702,22 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
 		return -EACCES;
 #endif
 
-	if (flags & MS_RDONLY)
-		acct_auto_close(&sb->s_pins);
-	shrink_dcache_sb(sb);
-
 	remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
 
+	if (remount_ro) {
+		if (sb->s_pins.first) {
+			up_write(&sb->s_umount);
+			acct_auto_close(&sb->s_pins);
+			down_write(&sb->s_umount);
+			if (!sb->s_root)
+				return 0;
+			if (sb->s_writers.frozen != SB_UNFROZEN)
+				return -EBUSY;
+			remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
+		}
+	}
+	shrink_dcache_sb(sb);
+
 	/* If we are remounting RDONLY and current sb is read/write,
 	   make sure there are no rw files opened */
 	if (remount_ro) {