From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/super.c | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/kernel/fs/super.c b/kernel/fs/super.c
index 602d02c..23ad90f 100644
--- a/kernel/fs/super.c
+++ b/kernel/fs/super.c
@@ -906,6 +906,7 @@
struct super_block *sb = fc->root->d_sb;
int retval;
bool remount_ro = false;
+ bool remount_rw = false;
bool force = fc->sb_flags & SB_FORCE;
if (fc->sb_flags_mask & ~MS_RMT_MASK)
@@ -922,7 +923,7 @@
if (!(fc->sb_flags & SB_RDONLY) && bdev_read_only(sb->s_bdev))
return -EACCES;
#endif
-
+ remount_rw = !(fc->sb_flags & SB_RDONLY) && sb_rdonly(sb);
remount_ro = (fc->sb_flags & SB_RDONLY) && !sb_rdonly(sb);
}
@@ -952,6 +953,14 @@
if (retval)
return retval;
}
+ } else if (remount_rw) {
+ /*
+ * We set s_readonly_remount here to protect filesystem's
+ * reconfigure code from writes from userspace until
+ * reconfigure finishes.
+ */
+ sb->s_readonly_remount = 1;
+ smp_wmb();
}
if (fc->ops->reconfigure) {
--
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