linux-kernel - [PATCH v2 0/4] tracefs/eventfs: Fix failed second run of test

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Date: Thu, 23 May 2024 01:14:25 -0400
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>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v2 0/4] tracefs/eventfs: Fix failed second run of test_ownership


The test_ownership test of the kselftests was failing again.
That's because the original fix was incorrect and a fix to
a race condition showed how the original fix was broken.

Instead of using tracefs_inodes to find the eventfs_inode that
needs to be reset on remount, use the "events" directory descriptor
to descend into its files and directories to catch all changes.

Changes since v1: https://lore.kernel.org/linux-trace-kernel/20240522124504.28982867@gandalf.local.home

 - Added other fixes underneath and rebased it on:
   https://lore.kernel.org/lkml/20240522164320.469785149@goodmis.org/

 - The real fix is to not use the tracefs_inodes to find the eventfs_inodes
   that need to be cleared on remount. Instead, the events descriptor
   needs to be used to descend its directories and files to update
   their attributes

 - The d_iput callback logic was misplaced. It should be done in the
   drop_inode callback.

  git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
eventfs/urgent

Head SHA1: 41b7db11bcac4638fa489c58d35e7d2146b665ab


Steven Rostedt (Google) (4):
      eventfs: Keep the directories from having the same inode number as files
      tracefs: Update inode permissions on remount
      eventfs: Update all the eventfs_inodes from the events descriptor
      tracefs: Clear EVENT_INODE flag in tracefs_drop_inode()

----
 fs/tracefs/event_inode.c | 57 +++++++++++++++++++++++++++++++++++++-----------
 fs/tracefs/inode.c       | 48 ++++++++++++++++++++++++----------------
 2 files changed, 73 insertions(+), 32 deletions(-)