Unverified Commit b21cba8d authored by Christian Brauner's avatar Christian Brauner
Browse files

pidfs: raise DCACHE_DONTCACHE explicitly 

While pidfs dentries are never hashed and thus retain_dentry() will never
consider them for placing them on the LRU it isn't great to always have
to go and remember that. Raise DCACHE_DONTCACHE explicitly as a visual
marker that dentries aren't kept but freed immediately instead.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-4-2e6f823ebdc0@kernel.org


Tested-by: default avatar <syzbot@syzkaller.appspotmail.com>
Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 6dbe134e

fs/pidfs.c

+1 −0
Original line number Diff line number Diff line
@@ -1022,6 +1022,7 @@ static int pidfs_init_fs_context(struct fs_context *fc) 


	fc->s_iflags |= SB_I_NOEXEC;

	fc->s_iflags |= SB_I_NODEV;

	ctx->s_d_flags |= DCACHE_DONTCACHE;

	ctx->ops = &pidfs_sops;

	ctx->eops = &pidfs_export_operations;

	ctx->dops = &pidfs_dentry_operations;