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doc: idmappings: fix an error and rephrase a paragraph

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If the modified paragraph is referring to the idmapping mentioned in the
previous paragraph (i.e. `u0:k10000:r10000`), then it is `u0` that the
upper idmapset starts with, not `u1000`.

Fix this error and rephrase this paragraph a bit to make this reference
more explicit.

Reported-by: Wang Lei <wanglei249@huawei.com>
Signed-off-by: GONG, Ruiqi <gongruiqi1@huawei.com>
Message-Id: <20230816033210.914262-1-gongruiqi@huaweicloud.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
GONG, Ruiqi 2023-08-16 11:32:10 +08:00 committed by Christian Brauner
parent 45071e1c28
commit b93ec212bc
1 changed files with 4 additions and 3 deletions
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7
Documentation/filesystems/idmappings.rst
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@ -146,9 +146,10 @@ For the rest of this document we will prefix all userspace ids with ``u`` and
all kernel ids with ``k``. Ranges of idmappings will be prefixed with ``r``. So all kernel ids with ``k``. Ranges of idmappings will be prefixed with ``r``. So
an idmapping will be written as ``u0:k10000:r10000``. an idmapping will be written as ``u0:k10000:r10000``.
For example, the id ``u1000`` is an id in the upper idmapset or "userspace For example, within this idmapping, the id ``u1000`` is an id in the upper
idmapset" starting with ``u1000``. And it is mapped to ``k11000`` which is a idmapset or "userspace idmapset" starting with ``u0``. And it is mapped to
kernel id in the lower idmapset or "kernel idmapset" starting with ``k10000``. ``k11000`` which is a kernel id in the lower idmapset or "kernel idmapset"
starting with ``k10000``.
A kernel id is always created by an idmapping. Such idmappings are associated A kernel id is always created by an idmapping. Such idmappings are associated
with user namespaces. Since we mainly care about how idmappings work we're not with user namespaces. Since we mainly care about how idmappings work we're not