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From: Al Viro <viro@zeniv.linux.org.uk>
To: Christoph Hellwig <hch@lst.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org
Subject: Re: [PATCH 06/24] fs: add a kern_chdir helper
Date: Mon, 20 Jul 2020 19:17:06 +0100	[thread overview]
Message-ID: <20200720181706.GR2786714@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200720155902.181712-7-hch@lst.de>

On Mon, Jul 20, 2020 at 05:58:44PM +0200, Christoph Hellwig wrote:
> Add a simple helper for a chdir with a kernelspace name and use it in the
> early init code instead of relying on the implicit set_fs(KERNEL_DS)
> there.  Remove the now unused ksys_chdir.

FWIW, my problem with that is that you are making it first-class primitive.
And I don't see any valid use for it - existing one is really "we have
a userland process that would be making syscalls if we only could have it
done right; the only reason we can't is that the infrastructure to build
the binary would be hell to maintain in the tree".  It's *NOT* "kernel
code that has a valid reason to get the syscall functionality".

  reply	other threads:[~2020-07-20 18:17 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20 15:58 add file system helpers that take kernel pointers for the init code Christoph Hellwig
2020-07-20 15:58 ` [PATCH 01/24] init: initialize ramdisk_execute_command at compile time Christoph Hellwig
2020-07-20 15:58 ` [PATCH 02/24] fs: add a do_kern_mount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 03/24] fs: add a kern_umount helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 04/24] fs: move the putname from filename_create to the callers Christoph Hellwig
2020-07-20 18:05   ` Linus Torvalds
2020-07-20 15:58 ` [PATCH 05/24] fs: move the putname from filename_lookup " Christoph Hellwig
2020-07-20 18:11   ` Al Viro
2020-07-20 15:58 ` [PATCH 06/24] fs: add a kern_chdir helper Christoph Hellwig
2020-07-20 18:17   ` Al Viro [this message]
2020-07-20 15:58 ` [PATCH 07/24] fs: add a kern_chroot helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 08/24] fs: add a kern_access helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 09/24] fs: add a kern_chown helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 10/24] fs: move the uid16 (f)chown syscalls to fs/open.c Christoph Hellwig
2020-07-20 15:58 ` [PATCH 11/24] fs: add a kern_chmod helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 12/24] fs: add a kern_utimes helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 13/24] fs: add a kern_mkdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 14/24] fs: add a kern_mknod helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 15/24] fs: add a kern_link helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 16/24] fs: add a kern_symlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 17/24] fs: add a kern_unlink helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 18/24] fs: add a kern_rmdir helper Christoph Hellwig
2020-07-20 15:58 ` [PATCH 19/24] fs: remove vfs_statx_fd Christoph Hellwig
2020-07-20 15:58 ` [PATCH 20/24] fs: implement vfs_stat and vfs_lstat in terms of vfs_fstatat Christoph Hellwig
2020-07-20 15:58 ` [PATCH 21/24] fs: move vfs_fstatat out of line Christoph Hellwig
2020-07-20 15:59 ` [PATCH 22/24] fs: remove vfs_stat_set_lookup_flags Christoph Hellwig
2020-07-20 15:59 ` [PATCH 23/24] fs: remove KSTAT_QUERY_FLAGS Christoph Hellwig
2020-07-20 15:59 ` [PATCH 24/24] fs: add a kern_stat helper Christoph Hellwig

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