mnt_ns_tree_remove(): DTRT if mnt_ns had never been added to mnt_ns_list

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[ Upstream commit 38f4885088 ]

Actual removal is done under the lock, but for checking if need to bother
the lockless RB_EMPTY_NODE() is safe - either that namespace had never
been added to mnt_ns_tree, in which case the the node will stay empty, or
whoever had allocated it has called mnt_ns_tree_add() and it has already
run to completion.  After that point RB_EMPTY_NODE() will become false and
will remain false, no matter what we do with other nodes in the tree.

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Al Viro 2025-08-26 16:35:55 -04:00 • committed by Greg Kroah-Hartman

parent b7b12f5e02

commit 7381cd1225

1 changed files with 1 additions and 1 deletions

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fs/namespace.c

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