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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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[-- Attachment #1 --]


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 = {f_version = 537068824, f_type = 50, f_flags = 4096, f_bsize =
> > 4096, f_iosize = 4096, f_blocks = 1949442, f_bfree = 1949436,
> > f_bavail = 1949436,
> >   f_files = 0, f_ffree = 0, f_syncwrites = 3, f_asyncwrites = 5,
> >   f_syncreads = 1907, f_asyncreads = 0, f_spare = 0xbf3fd628,
> > f_namemax = 255,
> >   f_owner = 0, f_fsid = {val = 0xbf3fd680}, f_charspare = 0xbf3fd688
> > "", f_fstypename = 0xbf3fd6d8 "msdosfs",
> >   f_mntfromname = 0xbf3fd6e8 "/dev/da0s1", f_mntonname = 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.)  Wrong
is wrong, 'yanno, although insanely large numbers of files on FAT
filesystems are bad news for performance reasons anyway.

-- 
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
/The Market Ticker/
/[S/MIME encrypted email preferred]/



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