Commit 3717bbcb authored by Hongbo Li's avatar Hongbo Li Committed by Christian Brauner
Browse files

doc: correcting the idmapping mount example 



In step 2, we obtain the kernel id `k1000`. So in next step (step
3), we should translate the `k1000` not `k21000`.

Signed-off-by: default avatarHongbo Li <lihongbo22@huawei.com>
Link: https://lore.kernel.org/r/20240816063611.1961910-1-lihongbo22@huawei.com


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 1aeb6def

Documentation/filesystems/idmappings.rst

+4 −4
Original line number Diff line number Diff line
@@ -821,7 +821,7 @@ the same idmapping to the mount. We now perform three steps: 
      /* Map the userspace id down into a kernel id in the filesystem's idmapping. */

      make_kuid(u0:k20000:r10000, u1000) = k21000



2. Verify that the caller's kernel ids can be mapped to userspace ids in the

3. Verify that the caller's kernel ids can be mapped to userspace ids in the

   filesystem's idmapping::



    from_kuid(u0:k20000:r10000, k21000) = u1000
@@ -854,10 +854,10 @@ The same translation algorithm works with the third example. 
       /* Map the userspace id down into a kernel id in the filesystem's idmapping. */

       make_kuid(u0:k0:r4294967295, u1000) = k1000



2. Verify that the caller's kernel ids can be mapped to userspace ids in the

3. Verify that the caller's kernel ids can be mapped to userspace ids in the

   filesystem's idmapping::



    from_kuid(u0:k0:r4294967295, k21000) = u1000

    from_kuid(u0:k0:r4294967295, k1000) = u1000



So the ownership that lands on disk will be ``u1000``.
@@ -994,7 +994,7 @@ from above::: 
      /* Map the userspace id down into a kernel id in the filesystem's idmapping. */

      make_kuid(u0:k0:r4294967295, u1000) = k1000



2. Verify that the caller's filesystem ids can be mapped to userspace ids in the

3. Verify that the caller's filesystem ids can be mapped to userspace ids in the

   filesystem's idmapping::



    from_kuid(u0:k0:r4294967295, k1000) = u1000