From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49ZqXiAgmrsHWDN9YsywkGofyM9wX7vFtYWdhI79tVTSSovQkFX33Rwq0gCf1/Ylqq/C4Lo ARC-Seal: i=1; a=rsa-sha256; t=1524405781; cv=none; d=google.com; s=arc-20160816; b=WBO2RcBnl2ybjJkT/tYy7zOJb7ebMaNmHONN/7gC9Szi9m/lIxylNnUvQyxw6H4h3O 0yeZHAQi0dngl7ItPr/yVhlwTFT3p/aPnk/7Ggw6TZgcqsMmrL3RgIqmGTYRVJk3Nq6E 0zxDOPYiank/m5qgCL5wONPLpp3UseEZq1AgSGwGOwRwlrMImIFYaUWt5Dk3RCyRo1A+ Jme93KyEiX7jbGB66OYrUwtvREdq9Z1vqWMqBj+055Lpmy+pZs/jDTXjPYVU1JzHehgU J+rsucEXRBIYl2ZFzUijOr9ncoMs58t3Us6JbIJ40Xr91YNnimcGKFA5E1iHjeGeG3pB yXcA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=/gXfpYgnOo+2oq4w1iSnhtRuJ0W6iLTW54BKxZl62Fs=; b=UER/Ss2U8V2bIszxk+8caV1AxjU8XgPF9+tBNWySshv9R2UpyXIKq2ghg5eAt9s3E+ gWl6lybDV39zg4Cb+fCcviuU6Nd25X3+TRpMcU5kIcLQbJJzgJxByw06u0UWbfv5AyNA 9ZImh1pESRsD05OKgnqkgUKXckbrfg2642FhAzB41V9EckIwRUmX9u1+FATYx2FdnPEQ qLhmu0eefAdxpWwN+qQsAVsDzIICR1uGPKB8AmNLlETVcsuZtipyVUZmMXbnvRNKSEON nokMeqVxkrwpCIpGZgx7VMS4xFWARUaTjkJmylgT5ETaDcH2uykoDilglAnbEYcVRA4b ivpA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Jiang , Dan Williams Subject: [PATCH 4.16 191/196] device-dax: allow MAP_SYNC to succeed Date: Sun, 22 Apr 2018 15:53:31 +0200 Message-Id: <20180422135114.135122549@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180422135104.278511750@linuxfoundation.org> References: <20180422135104.278511750@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598455316221551089?= X-GMAIL-MSGID: =?utf-8?q?1598455316221551089?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dave Jiang commit ef8423022324cf79bd1b41d8707c766461e7e555 upstream. MAP_SYNC is a nop for device-dax. Allow MAP_SYNC to succeed on device-dax to eliminate special casing between device-dax and fs-dax as to when the flag can be specified. Device-dax users already implicitly assume that they do not need to call fsync(), and this enables them to explicitly check for this capability. Cc: Fixes: b6fb293f2497 ("mm: Define MAP_SYNC and VM_SYNC flags") Signed-off-by: Dave Jiang Reviewed-by: Dan Williams Signed-off-by: Dan Williams Signed-off-by: Greg Kroah-Hartman --- drivers/dax/device.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -19,6 +19,7 @@ #include #include #include +#include #include "dax-private.h" #include "dax.h" @@ -534,6 +535,7 @@ static const struct file_operations dax_ .release = dax_release, .get_unmapped_area = dax_get_unmapped_area, .mmap = dax_mmap, + .mmap_supported_flags = MAP_SYNC, }; static void dev_dax_release(struct device *dev)