From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D2F934BD34A; Mon, 28 Sep 2026 21:32:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790631139; cv=none; b=mtJE95NeRkynVxO8711ae0jE/8K2mY8+dK1HSm4fd357wQczmlMtTxHhQJYP66Hvs4N9yNESfvARdC8Wh1X8JfSFvEZTU2kjO5KTkwuIWFsRDkoEq1e5hRGsXGq5Oq/ACXpmdAutS/5g7fIxwG8qsLIzghf4adKCc/sT7RAPxN4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790631139; c=relaxed/simple; bh=kTq7D01mZfVLBs9GZqHKcvD26t1F3rdqaNq9+M1lUBc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U9y6B8pMvolgswGJpA8zaJoP9pxNuQgaCxbL35cq8ap5LOz/t++ZpAmvFZ5vnbLVclR8DUMM0hOkaOu0lcJ6Mv2fV6y3iP0pSdf8nin1vva2PP/WeQSOIQnbWFLRc460dVMGIfVKn1ktUqISVKaE8JawSzbajE2La6Ivh8snwgo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=rEU0ai8L; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=dVKd4DNZ; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=rEU0ai8L; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=dVKd4DNZ; arc=none smtp.client-ip=195.135.223.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="rEU0ai8L"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="dVKd4DNZ"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="rEU0ai8L"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="dVKd4DNZ" Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 5D6961F7B8; Mon, 28 Sep 2026 21:32:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1790631127; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UpV5kne6nJmEIw7EQKGVoptq5OaJEMiFIgo7cnXo60c=; b=rEU0ai8LGFM25EG+Y+s1TttWWZGb17L+bIKt5K9DuZXFB26heWLS/VnzsNKyyLMcj6rILD jZ6/sj7whA2vf5A5DszizPhpkx5QyNu1V4CrQ6MEVy2VV/dWbXpfIPbqJIfTI2KwbSy/xr n4Y4VDspksNKAGczDTgw50bcbpTM/Gc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1790631127; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UpV5kne6nJmEIw7EQKGVoptq5OaJEMiFIgo7cnXo60c=; b=dVKd4DNZkFZJnQtj7/2O/bgaM9Jexu4l9O8/19TecRXs0WVhJZfVUBxyqaNby2K6/04rpF JRxg7t7/wdwwtuBw== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1790631127; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UpV5kne6nJmEIw7EQKGVoptq5OaJEMiFIgo7cnXo60c=; b=rEU0ai8LGFM25EG+Y+s1TttWWZGb17L+bIKt5K9DuZXFB26heWLS/VnzsNKyyLMcj6rILD jZ6/sj7whA2vf5A5DszizPhpkx5QyNu1V4CrQ6MEVy2VV/dWbXpfIPbqJIfTI2KwbSy/xr n4Y4VDspksNKAGczDTgw50bcbpTM/Gc= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1790631127; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UpV5kne6nJmEIw7EQKGVoptq5OaJEMiFIgo7cnXo60c=; b=dVKd4DNZkFZJnQtj7/2O/bgaM9Jexu4l9O8/19TecRXs0WVhJZfVUBxyqaNby2K6/04rpF JRxg7t7/wdwwtuBw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id C98141340F; Mon, 28 Sep 2026 21:32:06 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id e7PoHtbcumqWMwAAD6G6ig (envelope-from ); Mon, 28 Sep 2026 21:32:06 +0000 From: Gabriel Krisman Bertazi To: linux-fsdevel@vger.kernel.org Cc: Gabriel Krisman Bertazi , Christian Brauner , Jan Kara , "Theodore Ts'o" , Hugh Dickins , Daniel Tang , linux-ext4@vger.kernel.org, Miklos Szeredi , Amir Goldstein , linux-unionfs@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/4] shmem: Report casefold setting in mount options Date: Mon, 28 Sep 2026 17:31:52 -0400 Message-ID: <20260928213155.2612039-2-krisman@suse.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260928213155.2612039-1-krisman@suse.de> References: <20260928213155.2612039-1-krisman@suse.de> Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spam-Score: -1.30 X-Spam-Flag: NO X-Spamd-Result: default: False [-1.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_TWO(0.00)[2]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_CC(0.00)[suse.de,kernel.org,suse.cz,mit.edu,google.com,gmail.com,vger.kernel.org,szeredi.hu,kvack.org]; RCPT_COUNT_TWELVE(0.00)[12]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TAGGED_RCPT(0.00)[]; RCVD_TLS_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid,imap1.dmz-prg2.suse.org:helo]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com] For shmem, casefolding is a mount option. Report the current encoding and casefolding flags in /proc/mounts, so userspace can easily check if casefolding is supported withour relying on parsing dmesg or trying to set +F. Reported-by: Daniel Tang Link: https://lore.kernel.org/linux-fsdevel/5193732.31r3eYUQgx@daniel-desktop3/#R Assisted-by: LLM Signed-off-by: Gabriel Krisman Bertazi --- mm/shmem.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/mm/shmem.c b/mm/shmem.c index 897fa2b61346..2b93fcbf5127 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -4916,6 +4916,17 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root) if (sbinfo->qlimits.grpquota_ihardlimit) seq_printf(seq, ",grpquota_inode_hardlimit=%lld", sbinfo->qlimits.grpquota_ihardlimit); +#endif +#if IS_ENABLED(CONFIG_UNICODE) + if (root->d_sb->s_encoding) { + unsigned int version = root->d_sb->s_encoding->version; + + seq_printf(seq, ",casefold=utf8-%u.%u.%u", + unicode_major(version), unicode_minor(version), + unicode_rev(version)); + if (sb_has_strict_encoding(root->d_sb)) + seq_puts(seq, ",strict_encoding"); + } #endif return 0; } -- 2.55.0