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GET /api/1.2/patches/2220012/?format=api
{ "id": 2220012, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2220012/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-6-DefendTheDisabled@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": "<20260405195007.1306-6-DefendTheDisabled@gmail.com>", "list_archive_url": null, "date": "2026-04-05T19:50:01", "name": "[5/6] fat: map ptime to FAT creation time with rename-over", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "d561895633441885f1d102217c2aa8350ad8a764", "submitter": { "id": 93064, "url": "http://patchwork.ozlabs.org/api/1.2/people/93064/?format=api", "name": "Sean Smith", "email": "defendthedisabled@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-6-DefendTheDisabled@gmail.com/mbox/", "series": [ { "id": 498804, "url": "http://patchwork.ozlabs.org/api/1.2/series/498804/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=498804", "date": "2026-04-05T19:49:56", "name": "provenance_time (ptime): a new settable timestamp for cross-filesystem provenance", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498804/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220012/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220012/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=XNCA=CE=vger.kernel.org=linux-ext4+bounces-15647-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=XdDrRQQ5;\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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Only active on VFAT\n(long filename) mounts since plain FAT12/FAT16 lack creation time.\nFAT32 creation time has 2-second precision.\n\nGetattr: report creation time as ptime (VFAT only, via isvfat check).\nSetattr: write ptime to i_crtime.\nRename-over: save target creation time before detach, restore to\n source after attach. Preserves creation time across atomic saves.\n\nSigned-off-by: Sean Smith <DefendTheDisabled@gmail.com>\n---\n fs/fat/file.c | 6 ++++++\n fs/fat/namei_vfat.c | 20 ++++++++++++++++++--\n 2 files changed, 24 insertions(+), 2 deletions(-)", "diff": "diff --git a/fs/fat/file.c b/fs/fat/file.c\nindex 4fc49a614..9d1fcc554 100644\n--- a/fs/fat/file.c\n+++ b/fs/fat/file.c\n@@ -413,6 +413,10 @@ int fat_getattr(struct mnt_idmap *idmap, const struct path *path,\n \t\tstat->result_mask |= STATX_BTIME;\n \t\tstat->btime = MSDOS_I(inode)->i_crtime;\n \t}\n+\tif (sbi->options.isvfat && (request_mask & STATX_PTIME)) {\n+\t\tstat->result_mask |= STATX_PTIME;\n+\t\tstat->ptime = MSDOS_I(inode)->i_crtime;\n+\t}\n \n \treturn 0;\n }\n@@ -564,6 +568,8 @@ int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\n \t\tfat_truncate_time(inode, &attr->ia_mtime, S_MTIME);\n \tattr->ia_valid &= ~(ATTR_ATIME|ATTR_CTIME|ATTR_MTIME);\n \n+\tif (attr->ia_valid & ATTR_PTIME)\n+\t\tMSDOS_I(inode)->i_crtime = attr->ia_ptime;\n \tsetattr_copy(idmap, inode, attr);\n \tmark_inode_dirty(inode);\n out:\ndiff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c\nindex 47ff083cf..f1e2eadf8 100644\n--- a/fs/fat/namei_vfat.c\n+++ b/fs/fat/namei_vfat.c\n@@ -975,8 +975,24 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,\n \t}\n \tinode_inc_iversion(new_dir);\n \n-\tfat_detach(old_inode);\n-\tfat_attach(old_inode, new_i_pos);\n+\t/* ptime rename-over: save target creation time */\n+\t{\n+\t\tstruct timespec64 saved_crtime = {};\n+\t\tbool inherit_crtime = false;\n+\n+\t\tif (new_inode && S_ISREG(old_inode->i_mode) &&\n+\t\t S_ISREG(new_inode->i_mode) && old_inode->i_nlink == 1) {\n+\t\t\tsaved_crtime = MSDOS_I(new_inode)->i_crtime;\n+\t\t\tinherit_crtime = true;\n+\t\t}\n+\n+\t\tfat_detach(old_inode);\n+\t\tfat_attach(old_inode, new_i_pos);\n+\n+\t\tif (inherit_crtime)\n+\t\t\tMSDOS_I(old_inode)->i_crtime = saved_crtime;\n+\t}\n+\n \terr = vfat_sync_ipos(new_dir, old_inode);\n \tif (err)\n \t\tgoto error_inode;\n", "prefixes": [ "5/6" ] }