Date: Sat, 20 Dec 2008 13:56:28 +0000 From: Chris Whitehouse <cwhiteh@onetel.com> To: User Questions <freebsd-questions@freebsd.org> Subject: mount_msdosfs -o large? Message-ID: <494CF98C.8080304@onetel.com>
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Hi, I have a 250gb usb hard disk formatted fat32. With just mount_msdosfs I get %mount_msdosfs /dev/da0s1 mnt/usb mount_msdosfs: /dev/da0s1: Disk too big, try '-o large' mount option: Invalid argument The large option does seem to work: %mount_msdosfs -o large /dev/da0s1 mnt/usb %mount ... /dev/da0s1 on /usr/home/chrisw/mnt/usb (msdosfs, local, nosuid, mounted by chrisw) % However I can't find anything about the large option in man pages for mount, mount_msdosfs or fstab. Would this be suitable text to go in the -o options section of mount_msdosfs(8)? large Mount a filesystem larger than 128gb WARNING: This uses at least 32 bytes of kernel memory (which is not reclaimed until the FS is unmounted) for each file on disk to map between the 32-bit inode numbers used by VFS and the 64-bit pseudo-inode numbers used internally by msdosfs. This is only safe to use in certain controlled situations (e.g. read-only FS with less than 1 million files). Since the mappings do not persist across unmounts (or reboots), these filesystems are not suitable for exporting through NFS, or any other application that requires fixed inode numbers. I got the warning out of /sys/fs/msdosfs/msdosfs_vfsops.c on my FreeBSD eco 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #1: Tue Dec 16 18:28:48 GMT 2008 root@eco:/usr/obj/usr/src/sys/GENERIC i386 box. Thanks Chris
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