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porting: update locking requirements

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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>
This commit is contained in:
Christian Brauner 2023-10-18 12:26:20 +02:00
parent 3b224e1df6
commit 5aa9130acb
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7
Documentation/filesystems/porting.rst
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@ -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.