From: Matthew Wilcox <willy@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Trace Devel <linux-trace-devel@vger.kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Christian Brauner <brauner@kernel.org>,
Ajay Kaher <ajay.kaher@broadcom.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH] eventfs: Have inodes have unique inode numbers
Date: Fri, 26 Jan 2024 23:04:34 +0000 [thread overview]
Message-ID: <ZbQ6gkZ78kvbcF8A@casper.infradead.org> (raw)
In-Reply-To: <CAHk-=wiF0ATuuxJhwgm707izS=5q4xBUSh+06U2VwFEJj0FNRw@mail.gmail.com>
On Fri, Jan 26, 2024 at 02:48:45PM -0800, Linus Torvalds wrote:
> On Fri, 26 Jan 2024 at 14:34, Matthew Wilcox <willy@infradead.org> wrote:
> >
> > On Fri, Jan 26, 2024 at 05:14:12PM -0500, Mathieu Desnoyers wrote:
> > > I would suggest this straightforward solution to this:
> > >
> > > a) define a EVENTFS_MAX_INODES (e.g. 4096 * 8),
> > >
> > > b) keep track of inode allocation in a bitmap (within a single page),
> > >
> > > c) disallow allocating more than "EVENTFS_MAX_INODES" in eventfs.
> >
> > ... reinventing the IDA?
>
> Guysm, this is a random number that is *so* interesting that I
> seriously think we shouldn't have it at all.
>
> End result: nobody should care. Even the general VFS layer doesn't care.
>
> It literally avoids inode number zero, not because it would be a bad
> inode number, but simply because of some random historical oddity.
>
> In fact, I don't think we even have a reason for it. We have a commit
> 2adc376c5519 ("vfs: avoid creation of inode number 0 in get_next_ino")
> and that one calls out glibc for not deleting them. That makes no
> sense to me, but whatever.
Maybe we should take advantage of that historical oddity. All files
in eventfs have inode number 0, problem solved.
next prev parent reply other threads:[~2024-01-26 23:04 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-26 20:02 [PATCH] eventfs: Have inodes have unique inode numbers Steven Rostedt
2024-01-26 20:25 ` Linus Torvalds
2024-01-26 21:26 ` Steven Rostedt
2024-01-26 21:31 ` Linus Torvalds
2024-01-26 21:43 ` Steven Rostedt
2024-01-26 21:36 ` Linus Torvalds
2024-01-26 21:42 ` Steven Rostedt
2024-01-26 21:49 ` Linus Torvalds
2024-01-26 22:08 ` Steven Rostedt
2024-01-26 22:26 ` Linus Torvalds
2024-01-27 14:47 ` Steven Rostedt
2024-01-28 14:42 ` Steven Rostedt
2024-01-26 22:14 ` Mathieu Desnoyers
2024-01-26 22:29 ` Linus Torvalds
2024-01-26 22:41 ` Mathieu Desnoyers
2024-01-26 22:49 ` Linus Torvalds
2024-01-29 16:00 ` Mathieu Desnoyers
2024-01-29 18:58 ` Linus Torvalds
2024-01-26 22:34 ` Matthew Wilcox
2024-01-26 22:40 ` Mathieu Desnoyers
2024-01-26 22:48 ` Linus Torvalds
2024-01-26 23:04 ` Matthew Wilcox [this message]
2024-01-26 23:11 ` Linus Torvalds
2024-01-26 23:17 ` Linus Torvalds
2024-01-27 9:36 ` Andreas Schwab
2024-01-27 21:47 ` Linus Torvalds
2024-01-28 20:15 ` Steven Rostedt
2024-01-28 20:53 ` Linus Torvalds
2024-01-28 21:08 ` Linus Torvalds
2024-01-28 22:01 ` Steven Rostedt
2024-01-28 22:17 ` Linus Torvalds
2024-01-28 22:26 ` Steven Rostedt
2024-01-28 21:11 ` Steven Rostedt
2024-01-28 21:19 ` Steven Rostedt
2024-01-28 21:43 ` Linus Torvalds
2024-01-28 22:07 ` Linus Torvalds
2024-01-28 22:17 ` Steven Rostedt
2024-01-28 22:25 ` Linus Torvalds
2024-01-28 22:51 ` Steven Rostedt
2024-01-28 23:24 ` Linus Torvalds
2024-01-28 23:59 ` Steven Rostedt
2024-01-29 0:21 ` Steven Rostedt
2024-01-29 1:00 ` Linus Torvalds
2024-01-29 1:42 ` Linus Torvalds
2024-01-29 2:32 ` Steven Rostedt
2024-01-29 3:40 ` Steven Rostedt
2024-01-29 4:01 ` Linus Torvalds
2024-01-29 2:09 ` Steven Rostedt
2024-01-29 6:44 ` Amir Goldstein
2024-01-29 9:32 ` Steven Rostedt
2024-01-27 15:26 ` David Laight
2024-01-27 20:01 ` Linus Torvalds
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