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Wed, 27 May 2020 22:32:46 +0000 Received: from rnnvemgw01.nvidia.com (10.128.109.123) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 27 May 2020 22:32:45 +0000 Received: from sandstorm.nvidia.com (Not Verified[10.2.87.74]) by rnnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 27 May 2020 15:32:45 -0700 From: John Hubbard To: Andrew Morton CC: LKML , , John Hubbard Subject: [PATCH 1/2] mm/gup: introduce pin_user_pages_locked() Date: Wed, 27 May 2020 15:32:42 -0700 Message-ID: <20200527223243.884385-2-jhubbard@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200527223243.884385-1-jhubbard@nvidia.com> References: <20200527223243.884385-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1590618754; bh=IycP13r0Bgehgro+i/kfeYy/gdTMPNNoxOMONjYdmKE=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=h3hLoOZxMnWJnisFnZpNwUOKl3cIRfZkUKEo2EH5nn5TVuwgH/Sy9X6W048B9fWuN TkjuhLSVPp/Ldd+oGSUph85GF/1ErZRBXCQ/8O0NJiayOKD3fe3ox+3hF3PALbLPx2 0HVWUlgM8m/4dlJ58ynDuhIGwEFUZywz8EFtwGxwBS5KGC1iikyZaU/weATU8wjHKO qN8Uk8+jli6K/b+6N8ZYlmdOx8dxpohKKuzvTGwvksl+x2NMTk4JEx8G8Q06XdWkFY jzKCcrUSFZWnategb3taYH2Iu3iCvdIXWvobdoPKM4a0lUMl+E0uJthGpSH0divnrx e6gHD8gOfJ3hA== X-Rspamd-Queue-Id: 1B5081814B0C1 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Introduce pin_user_pages_locked(), which is nearly identical to get_user_pages_locked() except that it sets FOLL_PIN and rejects FOLL_GET. Signed-off-by: John Hubbard Reviewed-by: David Hildenbrand Acked-by: Pankaj Gupta --- include/linux/mm.h | 2 ++ mm/gup.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 98be7289d7e9..d16951087c93 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1700,6 +1700,8 @@ long pin_user_pages(unsigned long start, unsigned long nr_pages, struct vm_area_struct **vmas); long get_user_pages_locked(unsigned long start, unsigned long nr_pages, unsigned int gup_flags, struct page **pages, int *locked); +long pin_user_pages_locked(unsigned long start, unsigned long nr_pages, + unsigned int gup_flags, struct page **pages, int *locked); long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, struct page **pages, unsigned int gup_flags); long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, diff --git a/mm/gup.c b/mm/gup.c index 2f0a0b497c23..17418a949067 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2992,3 +2992,33 @@ long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, return get_user_pages_unlocked(start, nr_pages, pages, gup_flags); } EXPORT_SYMBOL(pin_user_pages_unlocked); + +/* + * pin_user_pages_locked() is the FOLL_PIN variant of get_user_pages_locked(). + * Behavior is the same, except that this one sets FOLL_PIN and rejects + * FOLL_GET. + */ +long pin_user_pages_locked(unsigned long start, unsigned long nr_pages, + unsigned int gup_flags, struct page **pages, + int *locked) +{ + /* + * FIXME: Current FOLL_LONGTERM behavior is incompatible with + * FAULT_FLAG_ALLOW_RETRY because of the FS DAX check requirement on + * vmas. As there are no users of this flag in this call we simply + * disallow this option for now. + */ + if (WARN_ON_ONCE(gup_flags & FOLL_LONGTERM)) + return -EINVAL; + + /* FOLL_GET and FOLL_PIN are mutually exclusive. */ + if (WARN_ON_ONCE(gup_flags & FOLL_GET)) + return -EINVAL; + + gup_flags |= FOLL_PIN; + return __get_user_pages_locked(current, current->mm, start, nr_pages, + pages, NULL, locked, + gup_flags | FOLL_TOUCH); +} +EXPORT_SYMBOL(pin_user_pages_locked); +