From owner-freebsd-fs@freebsd.org Mon Nov 20 21:33:54 2017 Return-Path: Delivered-To: freebsd-fs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 2B594DF610C for ; Mon, 20 Nov 2017 21:33:54 +0000 (UTC) (envelope-from karl@denninger.net) Received: from colo1.denninger.net (colo1.denninger.net [67.205.158.196]) by mx1.freebsd.org (Postfix) with ESMTP id 034DD6E29A for ; Mon, 20 Nov 2017 21:33:53 +0000 (UTC) (envelope-from karl@denninger.net) Received: from denninger.net (ip68-1-57-197.pn.at.cox.net [68.1.57.197]) by colo1.denninger.net (Postfix) with ESMTP id 1BFB6274BB for ; Mon, 20 Nov 2017 16:33:53 -0500 (EST) Received: from [192.168.10.23] (D13.Denninger.Net [192.168.10.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by denninger.net (Postfix) with ESMTPSA id 225803A1E3F for ; Mon, 20 Nov 2017 15:33:51 -0600 (CST) Subject: Re: MSDOS Filesystem question related to "read-only" files To: freebsd-fs@freebsd.org References: <0e31a0cf-8a97-1d63-8ebb-9c61d22539cb@denninger.net> <501b5bca-a4b0-7bd9-c1bd-09de0394e136@denninger.net> <20171120203706.5ffbfd28@raksha.tavi.co.uk> From: Karl Denninger Message-ID: <6a5701bf-7bc0-48a4-ba54-b947e3fd3416@denninger.net> Date: Mon, 20 Nov 2017 15:33:51 -0600 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <20171120203706.5ffbfd28@raksha.tavi.co.uk> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-512; boundary="------------ms000403000401050404090909" X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Nov 2017 21:33:54 -0000 This is a cryptographically signed message in MIME format. --------------ms000403000401050404090909 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 11/20/2017 14:37, Bob Eager wrote: > On Mon, 20 Nov 2017 14:22:15 -0600 > Karl Denninger wrote: > > > Oh, here's another interesting anomaly -- MSDOS filesystems return "0= " > > for the free file count! > > > (gdb) print fsbuf > > $3 =3D {f_version =3D 537068824, f_type =3D 50, f_flags =3D 4096, f_b= size =3D > > 4096, f_iosize =3D 4096, f_blocks =3D 1949442, f_bfree =3D 1949436, > > f_bavail =3D 1949436, > >=C2=A0=C2=A0 f_files =3D 0, f_ffree =3D 0, f_syncwrites =3D 3, f_async= writes =3D 5, > >=C2=A0=C2=A0 f_syncreads =3D 1907, f_asyncreads =3D 0, f_spare =3D 0xb= f3fd628, > > f_namemax =3D 255, > >=C2=A0=C2=A0 f_owner =3D 0, f_fsid =3D {val =3D 0xbf3fd680}, f_charspa= re =3D 0xbf3fd688 > > "", f_fstypename =3D 0xbf3fd6d8 "msdosfs", > >=C2=A0=C2=A0 f_mntfromname =3D 0xbf3fd6e8 "/dev/da0s1", f_mntonname =3D= 0xbf3fd740 > > "/mnt"} > > > Needless to say that can cause some interesting issues if you're > > coding to avoid potential inode exhaustion and the target is a MSDOS > > filesystem..... FAT filesystems DO have a maximum file count, > > incidentally. > > But surely only in the root directory? Uh, I pulled that on "." in the root directory (the mount point.)=C2=A0 W= rong is wrong, 'yanno, although insanely large numbers of files on FAT filesystems are bad news for performance reasons anyway. --=20 Karl Denninger karl@denninger.net /The Market Ticker/ /[S/MIME encrypted email preferred]/ --------------ms000403000401050404090909 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgMFADCABgkqhkiG9w0BBwEAAKCC DdgwggagMIIEiKADAgECAhMA5EiKghDOXrvfxYxjITXYDdhIMA0GCSqGSIb3DQEBCwUAMIGL MQswCQYDVQQGEwJVUzEQMA4GA1UECAwHRmxvcmlkYTESMBAGA1UEBwwJTmljZXZpbGxlMRkw FwYDVQQKDBBDdWRhIFN5c3RlbXMgTExDMRgwFgYDVQQLDA9DdWRhIFN5c3RlbXMgQ0ExITAf BgNVBAMMGEN1ZGEgU3lzdGVtcyBMTEMgMjAxNyBDQTAeFw0xNzA4MTcxNjQyMTdaFw0yNzA4 MTUxNjQyMTdaMHsxCzAJBgNVBAYTAlVTMRAwDgYDVQQIDAdGbG9yaWRhMRkwFwYDVQQKDBBD 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