From nobody Tue Feb 10 03:37:18 2026 Received: from canpmsgout05.his.huawei.com (canpmsgout05.his.huawei.com [113.46.200.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8FA49202C5C; Tue, 23 Dec 2025 02:09:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.220 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766455750; cv=none; b=AeOZcp+3mZkKlXiRULfQLeoNp07aXgVlrd9p8AWNjFL7bomXtEzo8X9XWkdBF2u4O1ART2hfFomLlwp1DQNNb5MTXZpQr+bQhbLrm26X8fstsEdbNh7V+fhpElj3JPlawVJN5jOlG1jRYldhjS0X8xBrEYBQJyGjpoo3QZYve1Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766455750; c=relaxed/simple; bh=xjQejwHpo21sqxcweisQvMiCA9nlciQ78yRV6gGAgtg=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XLRu9A8VNRjbryjEPjO5yxHgYVdnNyh842ZosG76Qghud0T2RZQNe9saY46ogY6j2X0JRY0h4D3rLNvt2ESAZQ7ly+qKaFyUnKJ8HXBFUn16eFwf4J523DpzSkH+IpY6Uyf8Zne15d3XHaeuqwGGgniafyts7rLwR/+a6JBfpoM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=Xxoqf+hY; arc=none smtp.client-ip=113.46.200.220 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="Xxoqf+hY" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=j/N4nU6o7xrNDKprehzCh2AlZWmtfEZgbQjQCLPtlc4=; b=Xxoqf+hY6BHtzYMaINHJrUWrQ38S/um79n/+M3JL+VIXX/Gy771OHQ8ebdQeN10geRGk8nREt PXBp9Qtols8bXUBGMgVteaeCt65uXq8MwNJsQlNW9/1GFHBOrqBVSan8hZQ9TGPkxG6eXb9pUHS T+qmwaWk5EJuBgXrjto9eRI= Received: from mail.maildlp.com (unknown [172.19.162.140]) by canpmsgout05.his.huawei.com (SkyGuard) with ESMTPS id 4dZyz43X0tz12LF4; Tue, 23 Dec 2025 10:05:52 +0800 (CST) Received: from kwepemr500015.china.huawei.com (unknown [7.202.195.162]) by mail.maildlp.com (Postfix) with ESMTPS id 9AF19201E8; Tue, 23 Dec 2025 10:09:05 +0800 (CST) Received: from huawei.com (10.67.174.162) by kwepemr500015.china.huawei.com (7.202.195.162) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 23 Dec 2025 10:09:04 +0800 From: Hongbo Li To: , , , , , CC: , , , Subject: [PATCH v10 05/10] erofs: support user-defined fingerprint name Date: Tue, 23 Dec 2025 01:56:14 +0000 Message-ID: <20251223015618.485626-6-lihongbo22@huawei.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20251223015618.485626-1-lihongbo22@huawei.com> References: <20251223015618.485626-1-lihongbo22@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: kwepems200001.china.huawei.com (7.221.188.67) To kwepemr500015.china.huawei.com (7.202.195.162) Content-Type: text/plain; charset="utf-8" From: Hongzhen Luo When creating the EROFS image, users can specify the fingerprint name. This is to prepare for the upcoming inode page cache share. Signed-off-by: Hongzhen Luo Signed-off-by: Hongbo Li --- fs/erofs/Kconfig | 9 +++++++++ fs/erofs/erofs_fs.h | 5 +++-- fs/erofs/internal.h | 2 ++ fs/erofs/super.c | 3 +++ fs/erofs/xattr.c | 13 +++++++++++++ 5 files changed, 30 insertions(+), 2 deletions(-) diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig index d81f3318417d..c88b6d0714a4 100644 --- a/fs/erofs/Kconfig +++ b/fs/erofs/Kconfig @@ -194,3 +194,12 @@ config EROFS_FS_PCPU_KTHREAD_HIPRI at higher priority. =20 If unsure, say N. + +config EROFS_FS_PAGE_CACHE_SHARE + bool "EROFS page cache share support (experimental)" + depends on EROFS_FS && EROFS_FS_XATTR && !EROFS_FS_ONDEMAND + help + This enables page cache sharing among inodes with identical + content fingerprints on the same device. + + If unsure, say N. diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h index e24268acdd62..20515d2462af 100644 --- a/fs/erofs/erofs_fs.h +++ b/fs/erofs/erofs_fs.h @@ -17,7 +17,7 @@ #define EROFS_FEATURE_COMPAT_XATTR_FILTER 0x00000004 #define EROFS_FEATURE_COMPAT_SHARED_EA_IN_METABOX 0x00000008 #define EROFS_FEATURE_COMPAT_PLAIN_XATTR_PFX 0x00000010 - +#define EROFS_FEATURE_COMPAT_ISHARE_XATTRS 0x00000020 =20 /* * Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should @@ -83,7 +83,8 @@ struct erofs_super_block { __le32 xattr_prefix_start; /* start of long xattr prefixes */ __le64 packed_nid; /* nid of the special packed inode */ __u8 xattr_filter_reserved; /* reserved for xattr name filter */ - __u8 reserved[3]; + __u8 ishare_xattr_prefix_id; /* indexes the ishare key in prefix xattres = */ + __u8 reserved[2]; __le32 build_time; /* seconds added to epoch for mkfs time */ __le64 rootnid_8b; /* (48BIT on) nid of root directory */ __le64 reserved2; diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h index 98fe652aea33..99e2857173c3 100644 --- a/fs/erofs/internal.h +++ b/fs/erofs/internal.h @@ -134,6 +134,7 @@ struct erofs_sb_info { u32 xattr_blkaddr; u32 xattr_prefix_start; u8 xattr_prefix_count; + u8 ishare_xattr_pfx; struct erofs_xattr_prefix_item *xattr_prefixes; unsigned int xattr_filter_reserved; #endif @@ -238,6 +239,7 @@ EROFS_FEATURE_FUNCS(sb_chksum, compat, COMPAT_SB_CHKSUM) EROFS_FEATURE_FUNCS(xattr_filter, compat, COMPAT_XATTR_FILTER) EROFS_FEATURE_FUNCS(shared_ea_in_metabox, compat, COMPAT_SHARED_EA_IN_META= BOX) EROFS_FEATURE_FUNCS(plain_xattr_pfx, compat, COMPAT_PLAIN_XATTR_PFX) +EROFS_FEATURE_FUNCS(ishare_xattrs, compat, COMPAT_ISHARE_XATTRS) =20 static inline u64 erofs_nid_to_ino64(struct erofs_sb_info *sbi, erofs_nid_= t nid) { diff --git a/fs/erofs/super.c b/fs/erofs/super.c index 2a44c4e5af4f..68480f10e69d 100644 --- a/fs/erofs/super.c +++ b/fs/erofs/super.c @@ -298,6 +298,9 @@ static int erofs_read_superblock(struct super_block *sb) if (ret) goto out; } + if (erofs_sb_has_ishare_xattrs(sbi)) + sbi->ishare_xattr_pfx =3D + dsb->ishare_xattr_prefix_id & EROFS_XATTR_LONG_PREFIX_MASK; =20 ret =3D -EINVAL; sbi->feature_incompat =3D le32_to_cpu(dsb->feature_incompat); diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c index 396536d9a862..969e77efd038 100644 --- a/fs/erofs/xattr.c +++ b/fs/erofs/xattr.c @@ -519,6 +519,19 @@ int erofs_xattr_prefixes_init(struct super_block *sb) } =20 erofs_put_metabuf(&buf); + if (!ret && erofs_sb_has_ishare_xattrs(sbi)) { + struct erofs_xattr_prefix_item *pf =3D pfs + sbi->ishare_xattr_pfx; + struct erofs_xattr_long_prefix *newpfx; + + newpfx =3D krealloc(pf->prefix, + sizeof(*newpfx) + pf->infix_len + 1, GFP_KERNEL); + if (newpfx) { + newpfx->infix[pf->infix_len] =3D '\0'; + pf->prefix =3D newpfx; + } else { + ret =3D -ENOMEM; + } + } sbi->xattr_prefixes =3D pfs; if (ret) erofs_xattr_prefixes_cleanup(sb); --=20 2.22.0