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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: jbmu4xaamopzc1dpjiw4h9ugqytaiur5 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3120120005 X-HE-Tag: 1790631133-535167 X-HE-Meta: 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 lvTf4kVe Hxf/HhMUkLjCc6wT+JpLKDIWrzdb9z45rM14ux5mdsmutT/exwh2hnTJk/cV6JZRiivlH2mvmN81eXIdWB2Frq9c7oRYOvSDoepXGjjr6ltzfueJ+vAI2X5touXDk+gNbkB1R9Iq2yuSdJXXCsptXUn1yUWEsKtPK1Hjmabp8KVBdBrG7Om4UN2FAtbSJjsV6FnuiiswUZpiyCyJ/9yu5uP4wxRLgxMxYyzwFvR6IKqdieeNt4XRlmUR+mEmhznOIf7fH+gBaTPc4sZPKJr8Ky8O0UUauJon6MITeEdTlHiZg0WZ3wDlHUpBH/9+Hy7xeocb+3u0ILolXup9zkFLdLw6+ibdp7TEco6IbpAYF5h6ju+qZhW0RTRM6dHo/tkJ/pC2O Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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