3af56fd95f
ZFS incorrectly uses directory-based extended attributes even when
xattr=sa is specified as a dataset property or mount option. Support to
honor temporary mount options including "xattr" was added in commit
0282c4137e. There are two issues with the
mount option handling:
* Libzfs has historically included "xattr" in its list of default mount
options. This overrides the dataset property, so the dataset is always
configured to use directory-based xattrs even when the xattr dataset
property is set to off or sa. Address this by removing "xattr" from
the set of default mount options in libzfs.
* There was no way to enable system attribute-based extended attributes
using temporary mount options. Add the mount options "saxattr" and
"dirxattr" which enable the xattr behavior their names suggest. This
approach has the advantages of mirroring the valid xattr dataset
property values and following existing conventions for mount option
names.
Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3787
145 lines
3.5 KiB
Groff
145 lines
3.5 KiB
Groff
'\" t
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.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or http://www.opensolaris.org/os/licensing.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\"
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.\" Copyright 2013 Darik Horn <dajhorn@vanadac.com>. All rights reserved.
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.\"
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.TH mount.zfs 8 "2013 FEB 28" "ZFS on Linux" "System Administration Commands"
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.SH NAME
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mount.zfs \- mount a ZFS filesystem
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.SH SYNOPSIS
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.LP
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.BI "mount.zfs [\-sfnvh] [\-o " options "]" " dataset mountpoint
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.SH DESCRIPTION
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.BR mount.zfs
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is part of the zfsutils package for Linux. It is a helper program that
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is usually invoked by the
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.BR mount (8)
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or
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.BR zfs (8)
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commands to mount a ZFS dataset.
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All
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.I options
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are handled according to the FILESYSTEM INDEPENDENT MOUNT OPTIONS
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section in the
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.BR mount (8)
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manual, except for those described below.
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The
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.I dataset
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parameter is a ZFS filesystem name, as output by the
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.B "zfs list -H -o name
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command. This parameter never has a leading slash character and is
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not a device name.
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The
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.I mountpoint
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parameter is the path name of a directory.
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.SH OPTIONS
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.TP
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.BI "\-s"
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Ignore bad or sloppy mount options.
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.TP
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.BI "\-f"
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Do a fake mount; do not perform the mount operation.
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.TP
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.BI "\-n"
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Do not update the /etc/mtab file.
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.TP
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.BI "\-v"
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Increase verbosity.
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.TP
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.BI "\-h"
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Print the usage message.
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.TP
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.BI "\-o context"
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This flag sets the SELinux context for all files in the filesytem
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under that mountpoint.
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.TP
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.BI "\-o fscontext"
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This flag sets the SELinux context for the filesytem being mounted.
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.TP
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.BI "\-o defcontext"
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This flag sets the SELinux context for unlabeled files.
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.TP
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.BI "\-o rootcontext"
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This flag sets the SELinux context for the root inode of the filesystem.
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.TP
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.BI "\-o legacy"
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This private flag indicates that the
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.I dataset
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has an entry in the /etc/fstab file.
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.TP
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.BI "\-o noxattr"
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This private flag disables extended attributes.
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.TP
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.BI "\-o xattr
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This private flag enables directory-based extended attributes and, if
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appropriate, adds a ZFS context to the selinux system policy.
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.TP
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.BI "\-o saxattr
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This private flag enables system attributed-based extended attributes and, if
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appropriate, adds a ZFS context to the selinux system policy.
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.TP
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.BI "\-o dirxattr
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Equivalent to
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.BR xattr .
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.TP
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.BI "\-o zfsutil"
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This private flag indicates that
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.BR mount (8)
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is being called by the
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.BR zfs (8)
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command.
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.SH NOTES
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ZFS conventionally requires that the
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.I mountpoint
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be an empty directory, but the Linux implementation inconsistently
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enforces the requirement.
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The
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.BR mount.zfs
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helper does not mount the contents of zvols.
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.SH FILES
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.TP 18n
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.I /etc/fstab
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The static filesystem table.
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.TP
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.I /etc/mtab
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The mounted filesystem table.
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.SH "AUTHORS"
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The primary author of
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.BR mount.zfs
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is Brian Behlendorf <behlendorf1@llnl.gov>.
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This man page was written by Darik Horn <dajhorn@vanadac.com>.
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.SH "SEE ALSO"
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.BR fstab (5),
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.BR mount (8),
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.BR zfs (8)
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