From: Andreas Dilger Subject: Re: [RFC][PATCH 00/12] Enhanced file stat system call Date: Wed, 25 Nov 2015 12:30:33 -0700 Message-ID: References: <1502878.QisWlqATFu@merkaba> <20151120145422.18930.72662.stgit@warthog.procyon.org.uk> <4495.1448036915@warthog.procyon.org.uk> <20151125175153.GA30335@fieldses.org> Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Content-Type: multipart/signed; boundary="Apple-Mail=_B68A526C-6F35-45DC-8D78-2FC1ED94CD24"; protocol="application/pgp-signature"; micalg=pgp-sha256 Cc: David Howells , Martin Steigerwald , arnd-r2nGTMty4D4@public.gmane.org, linux-afs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "J. Bruce Fields" Return-path: In-Reply-To: <20151125175153.GA30335-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> Sender: linux-cifs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-ext4.vger.kernel.org --Apple-Mail=_B68A526C-6F35-45DC-8D78-2FC1ED94CD24 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Nov 25, 2015, at 10:51 AM, J. Bruce Fields = wrote: >=20 > On Fri, Nov 20, 2015 at 04:28:35PM +0000, David Howells wrote: >> Martin Steigerwald wrote: >>=20 >>> Any plans to add limitations of filesystem to the call like maximum = file >>> size? I know its mostly relevant for just for FAT32, but on any = account >>> rather than trying to write 4 GiB and then file, it would be good to = at some >>> time get a dialog at the beginning of the copy. >>=20 >> Adding filesystem limits can be done. I got a shopping list of = things people >> wanted a while back and I've worked off of that list. I can add = other things >> - that's on of the reasons I left room for expansion. >=20 > I ran across systemd/src/basic/path-util.c:fd_is_mount_point() the = other > day, and the contortions it goes through made me wonder if we should > also add mnt_id and/or an is_mountpoint boolean--it's annoying to have > to do name_to_handle_at() (not supported on all filesystems) just to = get > mnt_id. >=20 > (Looking at it now I see it falls back on reading mount id from > /proc/self/fdinfo/. Maybe that's good enough. May depend on > whether there's a potential user that doesn't want to assume access to > /proc?) IMHO, it should be possible to get information about a file or directory from the file itself (i.e. statx() or fsinfo() on the path/fd), rather = than having to grub around in a /proc file that the application magically has = to know about, and parse text files there for every file being handled. Cheers, Andreas --Apple-Mail=_B68A526C-6F35-45DC-8D78-2FC1ED94CD24 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIVAwUBVlYMWnKl2rkXzB/gAQj1pBAAmJoSuxeZYOMue7LTxQSPWgCc7hODipqB +LORj4c+AV3afXJJ4XSiQSh+dVV5tCpGx4vABhqW2lCIy7Y+YScY4kvOCMzxFxZy d/HJWhVLjzbgq2lMAvytA7GBuVIFZNQiBtI1FkcTeEo3d8BLCApG/yZYvm7ALJs9 4YI2KSvrG44kBMpWBW/heRfvX0BgLpn0kedLlJVTxz7d+fgXv/j7mIKO05Ng6Ehb nT2gzyI2Dwz7W8rjO8gUhFGgxU73PPvFzBfn2ptgbD8pSRUkI3wKBbXdKXYihqTL WzqZ/Vjr0o5batxfPbUyR/sKiQSk5oLMFZI40q25dZahxskqlBSpDLbnOy/U1K0m 0nG1Xz900LZXLamMwoi1JSDnL7db7YlG6Aw+C+KZXaZO1AV3bJnCfR0B4A6ZWuNJ +xlU8fk9IOn/Y9hvOiF/UBtiC6jY4Yd7NvXG6YmpafpD+9PIHYhWXYDukuCn0JVv T8a89zZJRsrqp9DaH44YAYDFUZ8YwwiIuvNRLrq9fj1PqassssNuFIKy/dkCssf6 asD2kRgMe9n9gBgnMgIiUS1q+S6eprfz6MYEwQEZXDFtKwh1/2q0QYQyelZeq4St T2mracgunRl9sZmq2l9YGxukw2VBq0Xdk8QRyRPUVZmlbW9GN6rjCv9zRJdQjDxZ h8Gg+9uxENU= =fM4h -----END PGP SIGNATURE----- --Apple-Mail=_B68A526C-6F35-45DC-8D78-2FC1ED94CD24--