lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 4 Jan 2021 10:40:40 +0800
From:   Hao Li <>
To:     <>
CC:     <>, <>,
        <>, <>,
        <>, <>,
        <>, <>,
Subject: [PATCH] Documentation/dax: Update description of DAX policy changing

After commit 77573fa310d9 ("fs: Kill DCACHE_DONTCACHE dentry even if
DCACHE_REFERENCED is set"), changes to DAX policy will take effect
as soon as all references to this file are gone.

Update the documentation accordingly.

Signed-off-by: Hao Li <>
 Documentation/filesystems/dax.txt | 15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt
index 8fdb78f3c6c9..a5af22831087 100644
--- a/Documentation/filesystems/dax.txt
+++ b/Documentation/filesystems/dax.txt
@@ -84,19 +84,8 @@ Summary
        described in 6) below.
  6. When changing the S_DAX policy via toggling the persistent FS_XFLAG_DAX flag,
-    the change in behaviour for existing regular files may not occur
-    immediately.  If the change must take effect immediately, the administrator
-    needs to:
-    a) stop the application so there are no active references to the data set
-       the policy change will affect
-    b) evict the data set from kernel caches so it will be re-instantiated when
-       the application is restarted. This can be achieved by:
-       i. drop-caches
-       ii. a filesystem unmount and mount cycle
-       iii. a system reboot
+    the change to existing regular file won't take effect until the file is closed
+    by all processes or all processes referencing the file are stopped.

Powered by blists - more mailing lists