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authorChristian Brauner <brauner@kernel.org>2023-10-18 12:26:20 +0200
committerChristian Brauner <brauner@kernel.org>2023-10-28 13:29:23 +0200
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porting: update locking requirements
Now that s_umount is never taken under open_mutex update the documentation to say so. Link: https://lore.kernel.org/r/20231017184823.1383356-1-hch@lst.de Signed-off-by: Christian Brauner <brauner@kernel.org>
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diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst
index 4d05b9862451..d69f59700a23 100644
--- a/Documentation/filesystems/porting.rst
+++ b/Documentation/filesystems/porting.rst
@@ -1045,3 +1045,10 @@ filesystem type is now moved to a later point when the devices are closed:
As this is a VFS level change it has no practical consequences for filesystems
other than that all of them must use one of the provided kill_litter_super(),
kill_anon_super(), or kill_block_super() helpers.
+
+---
+
+**mandatory**
+
+Lock ordering has been changed so that s_umount ranks above open_mutex again.
+All places where s_umount was taken under open_mutex have been fixed up.