Date: Mon, 20 Nov 2017 15:33:51 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-fs@freebsd.org Subject: Re: MSDOS Filesystem question related to "read-only" files Message-ID: <6a5701bf-7bc0-48a4-ba54-b947e3fd3416@denninger.net> In-Reply-To: <20171120203706.5ffbfd28@raksha.tavi.co.uk> References: <f4ccb904-63fd-4641-89c8-09357fbb5a1c@denninger.net> <CAG6CVpUZumZaU9xVcri1Ry8=C6j6JrjX5F6qd3oKatYZXFu6Kg@mail.gmail.com> <e6a682a1-322e-a677-3d5e-0a7a503ebd40@denninger.net> <0e31a0cf-8a97-1d63-8ebb-9c61d22539cb@denninger.net> <501b5bca-a4b0-7bd9-c1bd-09de0394e136@denninger.net> <20171120203706.5ffbfd28@raksha.tavi.co.uk>
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On 11/20/2017 14:37, Bob Eager wrote:
> On Mon, 20 Nov 2017 14:22:15 -0600
> Karl Denninger <karl@denninger.net> 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 <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/
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