linux-ext4 - [PATCH v2 1/3] vfs: add the sb_start_intwrite

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Message-Id: <1524445859-26970-2-git-send-email-amir73il@gmail.com>
Date:   Sun, 22 Apr 2018 18:10:57 -0700
From:   Amir Goldstein <amir73il@...il.com>
To:     Theodore Tso <tytso@....edu>
Cc:     Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org
Subject: [PATCH v2 1/3] vfs: add the sb_start_intwrite_trylock() helper

Needed by ext4 to test frozen fs before updating s_last_mounted.

Signed-off-by: Amir Goldstein <amir73il@...il.com>
---
 include/linux/fs.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 760d8da1b6c7..cac41f1bad05 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1597,6 +1597,11 @@ static inline void sb_start_intwrite(struct super_block *sb)
 	__sb_start_write(sb, SB_FREEZE_FS, true);
 }
 
+static inline int sb_start_intwrite_trylock(struct super_block *sb)
+{
+	return __sb_start_write(sb, SB_FREEZE_FS, false);
+}
+
 
 extern bool inode_owner_or_capable(const struct inode *inode);
 
-- 
2.7.4