133 lines
3.5 KiB
Groff
133 lines
3.5 KiB
Groff
.\"
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.\" Copyright (c) 2010 Semihalf
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd Nov 11, 2010
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.Dt NANDFS 5
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.Os
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.Sh NAME
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.Nm nandfs
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.Nd NAND Flash file system
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.Sh SYNOPSIS
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To compile support for the
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.Nm ,
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place the following in your kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options NANDFS"
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.Ed
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.Pp
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Even though the NAND FS can be used with any storage media, it has been
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optimized and designed towards NAND Flash devices, so typically the following
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driver is used:
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.Bd -ragged -offset indent
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.Cd "device nand"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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driver enables
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.Fx
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with support for NAND-oriented file system.
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.Pp
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It is a log-structured style file system with the following major features and
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characteristics:
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.Bl -bullet
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.It
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Hard links, symbolic links support
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.It
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Block journaling
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.It
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Copy-On-Write
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.It
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Snapshots (continuous, taken automatically, simultaneously mountable)
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.It
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Quick crash recovery at mount time
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.It
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64-bit data structures; supports many files, large files and volumes
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.It
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POSIX file permissions
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.It
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Checksum / ECC
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.El
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.Sh EXAMPLES
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The most common usage is mounting the file system:
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.Pp
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.Dl "mount -t nandfs /dev/<gnandN> /mnt"
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.Pp
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or:
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.Dl "mount_nandfs /dev/<gnandN> /mnt"
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.Pp
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where
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.Ar gnandN
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is the GEOM device representing a Flash partition (slice) containing the
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.Nm
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structure, and
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.Pa /mnt
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is a mount point.
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.Pp
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It is possible to define an entry in
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.Pa /etc/fstab
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for the
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.Nm :
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.Bd -literal
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/dev/gnand0 /flash nandfs rw 0 0
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.Ed
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.Pp
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This will mount a
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.Nm
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partition at the specified mount point during system boot.
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.Sh SEE ALSO
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.Xr gnand 4 ,
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.Xr nand 4 ,
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.Xr mount_nandfs 8 ,
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.Xr nandfs 8 ,
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.Xr nandsim 8 ,
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.Xr nandtool 8 ,
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.Xr umount_nandfs 8
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.Sh HISTORY
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The NAND FS concepts are based on NILFS principles and initial implementation
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was derived from early read-only NILFS NetBSD code.
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Since then the NAND FS
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code diverged significantly and is by no means compatible with NILFS.
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.Pp
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The NAND Flash file system first appeared in
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.Fx 10.0 .
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.Sh AUTHORS
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.An -nosplit
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The NAND FS was written by
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.An Grzegorz Bernacki
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with the help of
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.An Mateusz Guzik ,
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based on the NetBSD code created by
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.An Reinoud Zandijk .
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Additional help and support by
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.An Lukasz Plachno ,
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.An Jan Sieka
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and
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.An Lukasz Wojcik .
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This manual page was written by
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.An Rafal Jaworowski .
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