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{ "id": 2224717, "url": "http://patchwork.ozlabs.org/api/1.2/covers/2224717/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260417213723.74204-1-artem.blagodarenko@gmail.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/1.2/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260417213723.74204-1-artem.blagodarenko@gmail.com>", "list_archive_url": null, "date": "2026-04-17T21:37:17", "name": "[0/3] Data in direntry (dirdata) feature", "submitter": { "id": 70973, "url": "http://patchwork.ozlabs.org/api/1.2/people/70973/?format=api", "name": "Artem Blagodarenko", "email": "artem.blagodarenko@gmail.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260417213723.74204-1-artem.blagodarenko@gmail.com/mbox/", "series": [ { "id": 500406, "url": "http://patchwork.ozlabs.org/api/1.2/series/500406/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500406", "date": "2026-04-17T21:37:18", "name": "Data in direntry (dirdata) feature", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500406/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2224717/comments/", "headers": { "Return-Path": "\n <SRS0=nzzZ=CQ=vger.kernel.org=linux-ext4+bounces-15887-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-ext4@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=J/JKW0qI;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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charset=UTF-8", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tFREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "EXT4 currently stores a hash in the directory entry\n(dirent) immediately after the file name to support\nsimultaneous fscrypt and casefold functionality.\n\nIt has been discussed within the EXT4 community that\nthis hash could instead be stored in dirdata. This\nwould make it the second (or third, in the case of\n64-bit inode counts) user of dirdata.\n\nAt the same time, the existing format—where the hash\nis placed after the file name—must continue to be\nsupported. With these patches, EXT4 can handle the\nhash in both formats.\n\nThe first user of this feature, LUFID, has been\ntested in the Lustre filesystem backend (LDISKFS)\n[1].\n\nSupport for fscrypt and case-insensitive directories\nwith dirdata enabled has been verified using a\ndedicated xfstest submitted to the EXT4 community as\na separate patch.\n\ne2fsprogs support is provided in a separate patch.\n\n[1] https://review.whamcloud.com/c/fs/lustre-release/+/64439\n\nArtem Blagodarenko (3):\n ext4: make dirdata work with metadata_csum\n ext4: add dirdata support structures and helpers\n ext4: dirdata feature\n\n fs/ext4/dir.c | 9 +-\n fs/ext4/ext4.h | 169 +++++++++++++++++++--\n fs/ext4/inline.c | 22 +--\n fs/ext4/namei.c | 379 ++++++++++++++++++++++++++++++-----------------\n fs/ext4/super.c | 4 +-\n fs/ext4/sysfs.c | 2 +\n 6 files changed, 422 insertions(+), 163 deletions(-)" }