linux-kernel - [PATCH v2 0/2] eventfs: Don't use dcache

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Date: Wed, 03 Jan 2024 20:52:47 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>,
 Ajay Kaher <akaher@...are.com>,
 Al Viro <viro@...IV.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>,
 linux-fsdevel@...r.kernel.org
Subject: [PATCH v2 0/2] eventfs: Don't use dcache_readdir() for getdents()

After having a "pleasant" conversation with Linus over on the security
mailing list, we came to the conclusion that eventfs should not be
using the dcache_readdir() routine for iterating the entries of a
directory (getdents()).

Instead, the .open and .release callbacks of the directory file
operations was removed and all the work is now done in the .iterate_shared.

The function dcache_readdir_wrapper() was renamed to eventfs_iterate().

As the files and directories of eventfs is all known within the meta
data, it can easily supply getdents() with the information it needs without
traversing the dentry.

Changes since v1: https://lore.kernel.org/linux-trace-kernel/20240103102553.17a19cea@gandalf.local.home/

- Broke up into two patches, one to fix the lookup parameter and the
  other to do the meat of the change.

- Moved the ctx->pos count up to skip creating of dentries in those cases.

Steven Rostedt (Google) (2):
      eventfs: Remove "lookup" parameter from create_dir/file_dentry()
      eventfs: Stop using dcache_readdir() for getdents()

----
 fs/tracefs/event_inode.c | 241 ++++++++++++++++-------------------------------
 1 file changed, 80 insertions(+), 161 deletions(-)