linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Al Viro <viro@zeniv.linux.org.uk>
To: Amir Goldstein <amir73il@gmail.com>
Cc: linux-fsdevel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Christian Brauner <brauner@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 09/20] [software coproarchaeology] dentry.h: kill a mysterious comment
Date: Fri, 24 Nov 2023 08:26:21 +0000	[thread overview]
Message-ID: <20231124082621.GW38156@ZenIV> (raw)
In-Reply-To: <20231124081141.GV38156@ZenIV>

On Fri, Nov 24, 2023 at 08:11:41AM +0000, Al Viro wrote:
> On Fri, Nov 24, 2023 at 09:37:16AM +0200, Amir Goldstein wrote:
> 
> > Since you like pre-git archeology...
> > 
> > Mind digging up what this comment in fs.h is about:
> > 
> > /* needed for stackable file system support */
> > extern loff_t default_llseek(struct file *file, loff_t offset, int whence);
> 
> Umm...  I think it was about ecryptfs and its ilk, but it was a long
> time ago...
> 
> <looks>
> 
> 2.3.99pre6, along with exporting it:
> -/* for stackable file systems (lofs, wrapfs, etc.) */
> -EXPORT_SYMBOL(add_to_page_cache);
> +/* for stackable file systems (lofs, wrapfs, cryptfs, etc.) */
> +EXPORT_SYMBOL(default_llseek);
> +EXPORT_SYMBOL(dentry_open);
> 
> Back then ->llseek == NULL used to mean default_llseek; that had
> been changed much later.  And that was before vfs_llseek() as well,
> so any layered filesystem had to open-code it - which required
> default_llseek().
> 
> The comment is certainly stale, though - stackable filesystems do *not*
> need it (vfs_llseek() is there), but every file_operation that used
> to have NULL ->llseek does.
> 
> > Or we can just remove it without digging up what the comment used
> > to refer to ;)
> 
> Too late - it will have to be removed with that ;-)

BTW, there's this, covering more than just BK times:

git://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/

  reply	other threads:[~2023-11-24  8:26 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-24  6:05 [PATCHES] assorted dcache stuff Al Viro
2023-11-24  6:06 ` [PATCH 01/20] selinux: saner handling of policy reloads Al Viro
2023-11-24  6:06   ` [PATCH 02/20] ovl: stop using d_alloc_anon()/d_instantiate_anon() Al Viro
2023-11-24  6:06   ` [PATCH 03/20] struct dentry: get rid of randomize_layout idiocy Al Viro
2023-11-24  6:06   ` [PATCH 04/20] get rid of __dget() Al Viro
2023-11-24  6:06   ` [PATCH 05/20] DCACHE_... ->d_flags bits: switch to BIT() Al Viro
2023-11-24  6:06   ` [PATCH 06/20] DCACHE_COOKIE: RIP Al Viro
2023-11-24  6:06   ` [PATCH 07/20] kill d_{is,set}_fallthru() Al Viro
2023-11-24  6:06   ` [PATCH 08/20] dentry.h: trim externs Al Viro
2023-11-24  6:06   ` [PATCH 09/20] [software coproarchaeology] dentry.h: kill a mysterious comment Al Viro
2023-11-24  7:37     ` Amir Goldstein
2023-11-24  8:11       ` Al Viro
2023-11-24  8:26         ` Al Viro [this message]
2023-11-24  8:29           ` Christian Brauner
2023-11-24  6:06   ` [PATCH 10/20] kill d_backing_dentry() Al Viro
2023-11-24  6:06   ` [PATCH 11/20] kill d_instantate_anon(), fold __d_instantiate_anon() into remaining caller Al Viro
2023-11-24  6:06   ` [PATCH 12/20] d_alloc_pseudo(): move setting ->d_op there from the (sole) caller Al Viro
2023-11-24  6:06   ` [PATCH 13/20] nsfs: use d_make_root() Al Viro
2023-11-24  6:06   ` [PATCH 14/20] simple_fill_super(): don't bother with d_genocide() on failure Al Viro
2023-11-24  6:06   ` [PATCH 15/20] d_genocide(): move the extern into fs/internal.h Al Viro
2023-11-24  6:35     ` d_genocide()? What about d_holodomor(), d_massmurder(), d_execute_warcrimes()? " Cedric Blancher
2023-11-24  6:57       ` Al Viro
2023-11-24  7:48         ` Al Viro
2023-11-24  9:36           ` Martin Steigerwald
2023-11-24 18:21             ` identifiers Al Viro
2023-11-24  6:06   ` [PATCH 16/20] get rid of DCACHE_GENOCIDE Al Viro
2023-11-24  6:06   ` [PATCH 17/20] d_alloc_parallel(): in-lookup hash insertion doesn't need an RCU variant Al Viro
2023-11-24  6:06   ` [PATCH 18/20] __d_unalias() doesn't use inode argument Al Viro
2023-11-24  6:06   ` [PATCH 19/20] kill DCACHE_MAY_FREE Al Viro
2023-11-24  6:06   ` [PATCH 20/20] dcache: remove unnecessary NULL check in dget_dlock() Al Viro
2023-11-24 21:41 ` [PATCHES] assorted dcache stuff Linus Torvalds

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20231124082621.GW38156@ZenIV \
    --to=viro@zeniv.linux.org.uk \
    --cc=amir73il@gmail.com \
    --cc=brauner@kernel.org \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=torvalds@linux-foundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).