[PATCH] mount_setattr.2: Update supported file-systems

[PATCH] mount_setattr.2: Update supported file-systems

[Rodrigo Campos]

Let's update the list with the last file-systems that added support.

You can easily verify this by "git grep FS_ALLOW_IDMAP" on the given Linux
version to see that the fs is listed and then checkout the previous Linux
version to see that it is not listed, therefore it was added in that version.

Signed-off-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
---

I've took the liberty of adding hugetlbfs that was merged in Linux 6.9-rc1 but there is still no
final release of 6.9. Please feel free to drop that if you prefer to wait for the final release to
include it.


Best,
Rodrigo

---
 man2/mount_setattr.2 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/man2/mount_setattr.2 b/man2/mount_setattr.2
index 3b70dcd97..f4bbc088b 100644
--- a/man2/mount_setattr.2
+++ b/man2/mount_setattr.2
@@ -667,6 +667,18 @@ Currently, the following filesystems support ID-mapped mounts:
 .IP \[bu]
 .B overlayfs
 (ID-mapped lower and upper layers supported since Linux 5.19)
+.IP \[bu]
+.B squashfs
+(since Linux 6.2)
+.IP \[bu]
+.B tmpfs
+(since Linux 6.3)
+.IP \[bu]
+.B cephfs
+(since Linux 6.7)
+.IP \[bu]
+.B hugetlbfs
+(since Linux 6.9)
 .PD
 .RE
 .IP \[bu]
-- 
2.43.0

Re: [PATCH] mount_setattr.2: Update supported file-systems

[Alejandro Colomar]

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Hi Rodrigo,

On Tue, Apr 09, 2024 at 03:10:46PM +0100, Rodrigo Campos wrote:
> Let's update the list with the last file-systems that added support.
> 
> You can easily verify this by "git grep FS_ALLOW_IDMAP" on the given Linux
> version to see that the fs is listed and then checkout the previous Linux
> version to see that it is not listed, therefore it was added in that version.

You could add the following to the commit message:

$ diff -w -U0 \
	<(git grep FS_ALLOW_IDMAP v6.8 | sed 's/^v6.8://') \
	<(git grep FS_ALLOW_IDMAP v6.9-rc4 | sed 's/^v6.9-rc4://') \
| tail -n+4;
+fs/hugetlbfs/inode.c:	.fs_flags               = FS_ALLOW_IDMAP,

$ diff -w -U0 \
	<(git grep FS_ALLOW_IDMAP v6.6 | sed 's/^v6.6://') \
	<(git grep FS_ALLOW_IDMAP v6.7 | sed 's/^v6.7://') \
| tail -n+4;
+fs/ceph/super.c:	.fs_flags	= FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
$ diff -w -U0 \
	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
	<(git grep FS_ALLOW_IDMAP v6.3 | sed 's/^v6.3://') \
| tail -n+4;
+mm/shmem.c:	.fs_flags	= FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
$ diff -w -U0 \
	<(git grep FS_ALLOW_IDMAP v6.1 | sed 's/^v6.1://') \
	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
| tail -n+4;
+fs/squashfs/super.c:	.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,


> 
> Signed-off-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
> ---
> 
> I've took the liberty of adding hugetlbfs that was merged in Linux 6.9-rc1 but there is still no
> final release of 6.9. Please feel free to drop that if you prefer to wait for the final release to
> include it.

Are you confident that it will be in 6.9?  If so, I don't mind having it
already in the manual.

> 
> 
> Best,
> Rodrigo
> 
> ---
>  man2/mount_setattr.2 | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/man2/mount_setattr.2 b/man2/mount_setattr.2
> index 3b70dcd97..f4bbc088b 100644
> --- a/man2/mount_setattr.2
> +++ b/man2/mount_setattr.2
> @@ -667,6 +667,18 @@ Currently, the following filesystems support ID-mapped mounts:
>  .IP \[bu]
>  .B overlayfs
>  (ID-mapped lower and upper layers supported since Linux 5.19)
> +.IP \[bu]
> +.B squashfs
> +(since Linux 6.2)
> +.IP \[bu]
> +.B tmpfs
> +(since Linux 6.3)
> +.IP \[bu]
> +.B cephfs
> +(since Linux 6.7)
> +.IP \[bu]
> +.B hugetlbfs
> +(since Linux 6.9)

I checked that all of them seem to be correct.  Thanks!

Have a lovely day!
Alex

>  .PD
>  .RE
>  .IP \[bu]
> -- 
> 2.43.0
> 

-- 
<https://www.alejandro-colomar.es/>

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Re: [PATCH] mount_setattr.2: Update supported file-systems

[Rodrigo Campos]

On 4/17/24 1:02 PM, Alejandro Colomar wrote:
> Hi Rodrigo,
> 
> On Tue, Apr 09, 2024 at 03:10:46PM +0100, Rodrigo Campos wrote:
>> Let's update the list with the last file-systems that added support.
>>
>> You can easily verify this by "git grep FS_ALLOW_IDMAP" on the given Linux
>> version to see that the fs is listed and then checkout the previous Linux
>> version to see that it is not listed, therefore it was added in that version.
> 
> You could add the following to the commit message:
> 
> $ diff -w -U0 \
> 	<(git grep FS_ALLOW_IDMAP v6.8 | sed 's/^v6.8://') \
> 	<(git grep FS_ALLOW_IDMAP v6.9-rc4 | sed 's/^v6.9-rc4://') \
> | tail -n+4;
> +fs/hugetlbfs/inode.c:	.fs_flags               = FS_ALLOW_IDMAP,
> 
> $ diff -w -U0 \
> 	<(git grep FS_ALLOW_IDMAP v6.6 | sed 's/^v6.6://') \
> 	<(git grep FS_ALLOW_IDMAP v6.7 | sed 's/^v6.7://') \
> | tail -n+4;
> +fs/ceph/super.c:	.fs_flags	= FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
> $ diff -w -U0 \
> 	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
> 	<(git grep FS_ALLOW_IDMAP v6.3 | sed 's/^v6.3://') \
> | tail -n+4;
> +mm/shmem.c:	.fs_flags	= FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
> $ diff -w -U0 \
> 	<(git grep FS_ALLOW_IDMAP v6.1 | sed 's/^v6.1://') \
> 	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
> | tail -n+4;
> +fs/squashfs/super.c:	.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,


Heh, nice trick. Do I need to resend for this or can you add it while 
you apply it?

>>
>> Signed-off-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
>> ---
>>
>> I've took the liberty of adding hugetlbfs that was merged in Linux 6.9-rc1 but there is still no
>> final release of 6.9. Please feel free to drop that if you prefer to wait for the final release to
>> include it.
> 
> Are you confident that it will be in 6.9?  If so, I don't mind having it
> already in the manual.

Yes. It's already rc6 and there was no issue reported for this, the 
patch is quite trivial too and was in linux-next before without issues 
either.



Best,
Rodrigo

Re: [PATCH] mount_setattr.2: Update supported file-systems

[Alejandro Colomar]

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Hi Rodrigo,

On Mon, Apr 29, 2024 at 11:19:36AM +0100, Rodrigo Campos wrote:
> On 4/17/24 1:02 PM, Alejandro Colomar wrote:
> > Hi Rodrigo,
> > 
> > On Tue, Apr 09, 2024 at 03:10:46PM +0100, Rodrigo Campos wrote:
> > > Let's update the list with the last file-systems that added support.

I've amended this: s/last/latest/

> > > You can easily verify this by "git grep FS_ALLOW_IDMAP" on the given Linux
> > > version to see that the fs is listed and then checkout the previous Linux
> > > version to see that it is not listed, therefore it was added in that version.
> > 
> > You could add the following to the commit message:
> > 
> > $ diff -w -U0 \
> > 	<(git grep FS_ALLOW_IDMAP v6.8 | sed 's/^v6.8://') \
> > 	<(git grep FS_ALLOW_IDMAP v6.9-rc4 | sed 's/^v6.9-rc4://') \
> > | tail -n+4;
> > +fs/hugetlbfs/inode.c:	.fs_flags               = FS_ALLOW_IDMAP,
> > 
> > $ diff -w -U0 \
> > 	<(git grep FS_ALLOW_IDMAP v6.6 | sed 's/^v6.6://') \
> > 	<(git grep FS_ALLOW_IDMAP v6.7 | sed 's/^v6.7://') \
> > | tail -n+4;
> > +fs/ceph/super.c:	.fs_flags	= FS_RENAME_DOES_D_MOVE | FS_ALLOW_IDMAP,
> > $ diff -w -U0 \
> > 	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
> > 	<(git grep FS_ALLOW_IDMAP v6.3 | sed 's/^v6.3://') \
> > | tail -n+4;
> > +mm/shmem.c:	.fs_flags	= FS_USERNS_MOUNT | FS_ALLOW_IDMAP,
> > $ diff -w -U0 \
> > 	<(git grep FS_ALLOW_IDMAP v6.1 | sed 's/^v6.1://') \
> > 	<(git grep FS_ALLOW_IDMAP v6.2 | sed 's/^v6.2://') \
> > | tail -n+4;
> > +fs/squashfs/super.c:	.fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
> 
> 
> Heh, nice trick. Do I need to resend for this or can you add it while you
> apply it?

I can.  :-)

> > > Signed-off-by: Rodrigo Campos <rodrigo@sdfg.com.ar>
> > > ---
> > > 
> > > I've took the liberty of adding hugetlbfs that was merged in Linux 6.9-rc1 but there is still no
> > > final release of 6.9. Please feel free to drop that if you prefer to wait for the final release to
> > > include it.
> > 
> > Are you confident that it will be in 6.9?  If so, I don't mind having it
> > already in the manual.
> 
> Yes. It's already rc6 and there was no issue reported for this, the patch is
> quite trivial too and was in linux-next before without issues either.

Okay.  I've applied the patch.  Thanks!
<https://www.alejandro-colomar.es/src/alx/linux/man-pages/man-pages.git/commit/?h=contrib&id=8ea186128f96d6f8912e05c95544734004618827>

Have a lovely day!
Alex

-- 
<https://www.alejandro-colomar.es/>
A client is hiring kernel driver, mm, and/or crypto developers;
contact me if interested.

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