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Thu, 17 Sep 2020 15:29:25 +0000 Received: from sol.localdomain (172-10-235-113.lightspeed.sntcca.sbcglobal.net [172.10.235.113]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D9F632224A; Thu, 17 Sep 2020 15:29:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600356549; bh=dsrHqCpL2En5vdo8EKO9ihwbSqFxqTvchyF3EQmBx8M=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pLRXIPMU+ebvvDik5sg9LeQLxfPqJ2VfS43CgFM7HSeOTANsZGnTFTJTgezDNSjOp JQbxMoBBOjqjx84cP7GtBdk6eGD1U5VV+fNacoBl4rBzEKoFw3oeRWyqZ36HmyXEdw DLqkCLEPIBXNzP2ARkC0eEXzCYDCBwGOA5LkiyJw= Date: Thu, 17 Sep 2020 08:29:07 -0700 From: Eric Biggers To: Jeff Layton Message-ID: <20200917152907.GB855@sol.localdomain> References: <20200917041136.178600-1-ebiggers@kernel.org> <20200917041136.178600-14-ebiggers@kernel.org> <41ad3cd50f4d213455bef4e7c42143c289690222.camel@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <41ad3cd50f4d213455bef4e7c42143c289690222.camel@kernel.org> X-Headers-End: 1kIvqZ-00D6sh-DR Subject: Re: [f2fs-dev] [PATCH v3 13/13] fscrypt: make fscrypt_set_test_dummy_encryption() take a 'const char *' X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Rosenberg , linux-f2fs-devel@lists.sourceforge.net, linux-fscrypt@vger.kernel.org, linux-mtd@lists.infradead.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On Thu, Sep 17, 2020 at 08:32:39AM -0400, Jeff Layton wrote: > On Wed, 2020-09-16 at 21:11 -0700, Eric Biggers wrote: > > From: Eric Biggers > > > > fscrypt_set_test_dummy_encryption() requires that the optional argument > > to the test_dummy_encryption mount option be specified as a substring_t. > > That doesn't work well with filesystems that use the new mount API, > > since the new way of parsing mount options doesn't use substring_t. > > > > Make it take the argument as a 'const char *' instead. > > > > Instead of moving the match_strdup() into the callers in ext4 and f2fs, > > make them just use arg->from directly. Since the pattern is > > "test_dummy_encryption=%s", the argument will be null-terminated. > > > > Are you sure about that? I thought the point of substring_t was to give > you a token from the string without null terminating it. > > ISTM that when you just pass in ->from, you might end up with trailing > arguments in your string like this. e.g.: > > "v2,foo,bar,baz" > > ...and then that might fail to match properly > in fscrypt_set_test_dummy_encryption. > Yes I'm sure, and I had also tested it. The use of match_token() here is to parse one null-terminated mount option at a time. The reason that match_token() can return multiple substrings is that the pattern might be something like "foo=%d:%d". But here it's just "test_dummy_encryption=%s". "%s" matches until end-of-string. - Eric _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel