{"id":2220010,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2220010/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-4-DefendTheDisabled@gmail.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/projects/8/?format=json","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":"<20260405195007.1306-4-DefendTheDisabled@gmail.com>","list_archive_url":null,"date":"2026-04-05T19:49:59","name":"[3/6] ntfs3: map ptime to NTFS creation time with rename-over","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"97d39b44b306eef479bb73dcee69a7d6c3e41327","submitter":{"id":93064,"url":"http://patchwork.ozlabs.org/api/1.2/people/93064/?format=json","name":"Sean Smith","email":"defendthedisabled@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260405195007.1306-4-DefendTheDisabled@gmail.com/mbox/","series":[{"id":498804,"url":"http://patchwork.ozlabs.org/api/1.2/series/498804/?format=json","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/2220010/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220010/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","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=EVXrs8bm;\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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Justified because Windows treats NTFS creation time\nas mutable via SetFileTime() - it was never truly immutable.\n\nGetattr: report NTFS creation time as ptime.\nSetattr: write ptime to NTFS creation time via frecord cr_time path.\nRename-over: save target creation time before unlink, restore to\n source after rename. Replicates Windows behavior where creation\n time survives application atomic saves.\n\nRound-trip: NTFS Date Created -> Btrfs ptime -> NTFS Date Created\npreserves the original creation date through cross-FS copies.\n\nSigned-off-by: Sean Smith \n---\n fs/ntfs3/file.c | 13 +++++++++++++\n fs/ntfs3/frecord.c | 8 ++++++++\n fs/ntfs3/namei.c | 14 ++++++++++++++\n 3 files changed, 35 insertions(+)","diff":"diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c\nindex 13d014b87..8688a48b1 100644\n--- a/fs/ntfs3/file.c\n+++ b/fs/ntfs3/file.c\n@@ -161,6 +161,13 @@ int ntfs_getattr(struct mnt_idmap *idmap, const struct path *path,\n \n \tstat->result_mask |= STATX_BTIME;\n \tstat->btime = ni->i_crtime;\n+\n+\t/* Map NTFS creation time to ptime (provenance time) */\n+\tif (request_mask & STATX_PTIME) {\n+\t\tstat->ptime = ni->i_crtime;\n+\t\tstat->result_mask |= STATX_PTIME;\n+\t}\n+\n \tstat->blksize = ni->mi.sbi->cluster_size; /* 512, 1K, ..., 2M */\n \n \tif (inode->i_flags & S_IMMUTABLE)\n@@ -857,6 +864,12 @@ int ntfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,\n \t\ti_size_write(inode, newsize);\n \t}\n \n+\t/* Accept ptime and store as NTFS creation time */\n+\tif (ia_valid & ATTR_PTIME) {\n+\t\tni->i_crtime = attr->ia_ptime;\n+\t\tni->ni_flags |= NI_FLAG_UPDATE_PARENT;\n+\t}\n+\n \tsetattr_copy(idmap, inode, attr);\n \n \tif (mode != inode->i_mode) {\ndiff --git a/fs/ntfs3/frecord.c b/fs/ntfs3/frecord.c\nindex d5bbd47e1..b164b2f50 100644\n--- a/fs/ntfs3/frecord.c\n+++ b/fs/ntfs3/frecord.c\n@@ -3197,6 +3197,14 @@ int ni_write_inode(struct inode *inode, int sync, const char *hint)\n \t\t\tmodified = true;\n \t\t}\n \n+\t\t/* Write creation time (ptime maps to NTFS cr_time) */\n+\t\tts = ni->i_crtime;\n+\t\tdup.cr_time = kernel2nt(&ts);\n+\t\tif (std->cr_time != dup.cr_time) {\n+\t\t\tstd->cr_time = dup.cr_time;\n+\t\t\tmodified = true;\n+\t\t}\n+\n \t\tdup.fa = ni->std_fa;\n \t\tif (std->fa != dup.fa) {\n \t\t\tstd->fa = dup.fa;\ndiff --git a/fs/ntfs3/namei.c b/fs/ntfs3/namei.c\nindex b2af8f695..40d06884f 100644\n--- a/fs/ntfs3/namei.c\n+++ b/fs/ntfs3/namei.c\n@@ -292,6 +292,16 @@ static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,\n \t\treturn -EINVAL;\n \t}\n \n+\t/* ptime rename-over: save target creation time before unlink */\n+\tstruct timespec64 saved_crtime = {};\n+\tbool inherit_crtime = false;\n+\n+\tif (new_inode && S_ISREG(inode->i_mode) &&\n+\t S_ISREG(new_inode->i_mode) && inode->i_nlink == 1) {\n+\t\tsaved_crtime = ntfs_i(new_inode)->i_crtime;\n+\t\tinherit_crtime = true;\n+\t}\n+\n \tif (new_inode) {\n \t\t/* Target name exists. Unlink it. */\n \t\tdget(new_dentry);\n@@ -330,6 +340,10 @@ static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,\n \n \terr = ni_rename(dir_ni, new_dir_ni, ni, de, new_de);\n \tif (!err) {\n+\t\t/* ptime rename-over: inherit target creation time */\n+\t\tif (inherit_crtime)\n+\t\t\tni->i_crtime = saved_crtime;\n+\n \t\tsimple_rename_timestamp(dir, dentry, new_dir, new_dentry);\n \t\tmark_inode_dirty(inode);\n \t\tmark_inode_dirty(dir);\n","prefixes":["3/6"]}