[{"id":3673622,"web_url":"http://patchwork.ozlabs.org/comment/3673622/","msgid":"<20260405233222.GW3836593@ZenIV>","list_archive_url":null,"date":"2026-04-05T23:32:22","subject":"Re: [PATCH 2/2] smb: client: add support for O_TMPFILE","submitter":{"id":583,"url":"http://patchwork.ozlabs.org/api/people/583/","name":"Al Viro","email":"viro@ZenIV.linux.org.uk"},"content":"On Sun, Apr 05, 2026 at 06:18:19PM -0300, Paulo Alcantara wrote:\n\n> @@ -436,17 +457,13 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned\n> \t\tgoto out_err;\n> \t}\n> \n> -\tif (newinode)\n> -\t\tif (S_ISDIR(newinode->i_mode)) {\n> -\t\t\trc = -EISDIR;\n> -\t\t\tgoto out_err;\n> -\t\t}\n> +\tif (newinode && S_ISDIR(newinode->i_mode)) {\n> +\t\trc = -EISDIR;\n> +\t\tgoto out_err;\n> +\t}\n> \n> \td_drop(direntry);\n> -\td_add(direntry, newinode);\n\n> +\t\trc = __cifs_do_create(dir, direntry, full_path, xid,\n> +\t\t\t\t tlink, oflags, mode, oplock,\n> +\t\t\t\t fid, buf, &inode);\n> +\t\tif (!rc)\n> +\t\t\td_add(direntry, inode);\n\n\n> +\t\trc = __cifs_do_create(dir, dentry, path, xid, tlink,\n> +\t\t\t\t file->f_flags, mode, &oplock,\n> +\t\t\t\t &fid, NULL, &inode);\n> +\t\tif (!rc) {\n> +\t\t\tset_nlink(inode, 0);\n> +\t\t\tmark_inode_dirty(inode);\n> +\t\t\td_mark_tmpfile_name(file, &QSTR_LEN(name, size - 1));\n> +\t\t\td_instantiate(dentry, inode);\n\nI really don't like this \"not sure what the state is, d_drop() to\nget it unhashed\" pattern, _especially_ when d_drop() and d_add() or\nd_instantiate() get separated.\n\nNote, BTW, this d_add() call site is one of the two in the entire kernel\nthat are neither d_splice_alias() in disguise nor pass NULL as inode.\nThe other one is nfs_link(), where we also have this kind of \"d_drop()\nfirst, then use d_add()\" pattern.\n\nFolks, what state can dentry be in cifs_do_create()? I'd rather see\nthat sorted out, not obfuscated even more.\n\nFWIW, that's a major headache for Neil's stuff around directory locking\nchanges - any place where we play with unhash-and-rehash needs separate\nanalysis. d_drop() is not something to be used lightly; it obfuscates the\ndentry state and we'll need to translate those to the new locking scheme.","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linux.org.uk header.i=@linux.org.uk header.a=rsa-sha256\n header.s=zeniv-20220401 header.b=gOtfBH6e;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-cifs+bounces-10670-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk\n header.b=\"gOtfBH6e\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=62.89.141.173","smtp.subspace.kernel.org;\n dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk","smtp.subspace.kernel.org;\n spf=none smtp.mailfrom=ftp.linux.org.uk"],"Received":["from sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fppYs1lXNz1yFt\n\tfor ; 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b=gOtfBH6ehak6y8ecVZ6XnaL6T0\n\t94Bc651XDuWUdTr9YHIMfzDwT97Bav6isqm12D7kAQ/PM965qTNTZeTahaZKDDRwZm5RZI53IDVCa\n\txCu87SzSSMz2rkWrDPcGHjO0hx/Wqv/BecY2CwX/XCjE+S2VZ1K/QuafR9avTKmHQtq1JLmztY9K1\n\tozBbjn4DCu+BG+LSlue/1cvKS4dCcVF+C5fYQlfKVZfyz0NoGyG9ZFV6GoESaGVoiVcMz1LTLmWCB\n\tqlkeJ2cnFO0vb9wC5rwnIepwz9oe65/DjU9l0RcztsrPLrsRUcTdPdAqnHh6mFB8H6+qhRQSdZgVA\n\tD26NiXwQ==;","Date":"Mon, 6 Apr 2026 00:32:22 +0100","From":"Al Viro ","To":"Paulo Alcantara ","Cc":"smfrench@gmail.com, David Howells ,\n\tlinux-fsdevel@vger.kernel.org, linux-cifs@vger.kernel.org,\n\tNeil Brown ","Subject":"Re: [PATCH 2/2] smb: client: add support for O_TMPFILE","Message-ID":"<20260405233222.GW3836593@ZenIV>","References":"<20260405211819.1251369-1-pc@manguebit.org>\n <20260405211819.1251369-2-pc@manguebit.org>","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Type":"text/plain; charset=us-ascii","Content-Disposition":"inline","In-Reply-To":"<20260405211819.1251369-2-pc@manguebit.org>","Sender":"Al Viro "}},{"id":3673633,"web_url":"http://patchwork.ozlabs.org/comment/3673633/","msgid":"<177543319568.1474915.17445767081272255066@noble.neil.brown.name>","list_archive_url":null,"date":"2026-04-05T23:53:15","subject":"Re: [PATCH 2/2] smb: client: add support for O_TMPFILE","submitter":{"id":91821,"url":"http://patchwork.ozlabs.org/api/people/91821/","name":"NeilBrown","email":"neilb@ownmail.net"},"content":"On Mon, 06 Apr 2026, Al Viro wrote:\n> On Sun, Apr 05, 2026 at 06:18:19PM -0300, Paulo Alcantara wrote:\n> \n> > @@ -436,17 +457,13 @@ static int cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned\n> > \t\tgoto out_err;\n> > \t}\n> > \n> > -\tif (newinode)\n> > -\t\tif (S_ISDIR(newinode->i_mode)) {\n> > -\t\t\trc = -EISDIR;\n> > -\t\t\tgoto out_err;\n> > -\t\t}\n> > +\tif (newinode && S_ISDIR(newinode->i_mode)) {\n> > +\t\trc = -EISDIR;\n> > +\t\tgoto out_err;\n> > +\t}\n> > \n> > \td_drop(direntry);\n> > -\td_add(direntry, newinode);\n> \n> > +\t\trc = __cifs_do_create(dir, direntry, full_path, xid,\n> > +\t\t\t\t tlink, oflags, mode, oplock,\n> > +\t\t\t\t fid, buf, &inode);\n> > +\t\tif (!rc)\n> > +\t\t\td_add(direntry, inode);\n> \n> \n> > +\t\trc = __cifs_do_create(dir, dentry, path, xid, tlink,\n> > +\t\t\t\t file->f_flags, mode, &oplock,\n> > +\t\t\t\t &fid, NULL, &inode);\n> > +\t\tif (!rc) {\n> > +\t\t\tset_nlink(inode, 0);\n> > +\t\t\tmark_inode_dirty(inode);\n> > +\t\t\td_mark_tmpfile_name(file, &QSTR_LEN(name, size - 1));\n> > +\t\t\td_instantiate(dentry, inode);\n> \n> I really don't like this \"not sure what the state is, d_drop() to\n> get it unhashed\" pattern, _especially_ when d_drop() and d_add() or\n> d_instantiate() get separated.\n> \n> Note, BTW, this d_add() call site is one of the two in the entire kernel\n> that are neither d_splice_alias() in disguise nor pass NULL as inode.\n> The other one is nfs_link(), where we also have this kind of \"d_drop()\n> first, then use d_add()\" pattern.\n> \n> Folks, what state can dentry be in cifs_do_create()? I'd rather see\n> that sorted out, not obfuscated even more.\n\ncifs_do_create() gets call from cifs_atomic_open() which is\n->atomic_open(), so dentry can be in-lookup or negative-hashed.\n\nIf is also called from cifs_create() (->create()) and as cifs_lookup()\nnever skips the lookup due to intent (like NFS does) the dentry will\nalways be hashed negative.\n\nSo dentry can be in-lookup or hashed-negative. With current APIs we can\navoid d_drop() with\n\n if (d_in_lookup(dentry))\n d_add(dentry, inode);\n else\n d_instantiate(dentry, inode);\n\nthough I would prefer to provide an interface which handled both.\n\nNeilBrown\n\n\n> \n> FWIW, that's a major headache for Neil's stuff around directory locking\n> changes - any place where we play with unhash-and-rehash needs separate\n> analysis. d_drop() is not something to be used lightly; it obfuscates the\n> dentry state and we'll need to translate those to the new locking scheme.\n>","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ownmail.net header.i=@ownmail.net header.a=rsa-sha256\n header.s=fm2 header.b=Nc5j3f7w;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=messagingengine.com header.i=@messagingengine.com\n header.a=rsa-sha256 header.s=fm2 header.b=Uo3d0MnJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","From":"NeilBrown ","To":"\"Al Viro\" ","Cc":"\"Paulo Alcantara\" , smfrench@gmail.com,\n \"David Howells\" , linux-fsdevel@vger.kernel.org,\n linux-cifs@vger.kernel.org","Subject":"Re: [PATCH 2/2] smb: client: add support for O_TMPFILE","In-reply-to":"<20260405233222.GW3836593@ZenIV>","References":"<20260405211819.1251369-1-pc@manguebit.org>\n <20260405211819.1251369-2-pc@manguebit.org>\n <20260405233222.GW3836593@ZenIV>","Date":"Mon, 06 Apr 2026 09:53:15 +1000","Message-id":"<177543319568.1474915.17445767081272255066@noble.neil.brown.name>","Reply-To":"NeilBrown "}}]