fs: document mapping helpers

Document new helpers we introduced this cycle.

Link: https://lore.kernel.org/r/20210320122623.599086-2-christian.brauner@ubuntu.com
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2021-03-20 13:26:21 +01:00
commit 1bd66c1a32
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