freebsd-skq/share/man/man9/VFS_SET.9

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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
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.Dd February 21, 2013
.Dt VFS_SET 9
.Os
.Sh NAME
.Nm VFS_SET
.Nd set up loadable file system
.Vt vfsconf
.Sh SYNOPSIS
.In sys/param.h
.In sys/kernel.h
.In sys/module.h
.In sys/mount.h
.Ft void
.Fn VFS_SET "struct vfsops *vfsops" "fsname" "int flags"
.Sh DESCRIPTION
.Fn VFS_SET
creates a
.Vt vfsconf
structure for the loadable module with the given
.Fa vfsops , fsname
and
.Fa flags ,
and declares it by calling
.Xr DECLARE_MODULE 9
using
.Fn vfs_modevent
as the event handler.
.Pp
Possible values for the
.Fa flags
2005-01-07 12:01:11 +00:00
argument are:
Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. This bring huge amount of changes, I'll enumerate only user-visible changes: - Delegated Administration Allows regular users to perform ZFS operations, like file system creation, snapshot creation, etc. - L2ARC Level 2 cache for ZFS - allows to use additional disks for cache. Huge performance improvements mostly for random read of mostly static content. - slog Allow to use additional disks for ZFS Intent Log to speed up operations like fsync(2). - vfs.zfs.super_owner Allows regular users to perform privileged operations on files stored on ZFS file systems owned by him. Very careful with this one. - chflags(2) Not all the flags are supported. This still needs work. - ZFSBoot Support to boot off of ZFS pool. Not finished, AFAIK. Submitted by: dfr - Snapshot properties - New failure modes Before if write requested failed, system paniced. Now one can select from one of three failure modes: - panic - panic on write error - wait - wait for disk to reappear - continue - serve read requests if possible, block write requests - Refquota, refreservation properties Just quota and reservation properties, but don't count space consumed by children file systems, clones and snapshots. - Sparse volumes ZVOLs that don't reserve space in the pool. - External attributes Compatible with extattr(2). - NFSv4-ACLs Not sure about the status, might not be complete yet. Submitted by: trasz - Creation-time properties - Regression tests for zpool(8) command. Obtained from: OpenSolaris
2008-11-17 20:49:29 +00:00
.Bl -hang -width ".Dv VFCF_DELEGADMIN"
.It Dv VFCF_STATIC
File system should be statically available in the kernel.
.It Dv VFCF_NETWORK
Network exportable file system.
.It Dv VFCF_READONLY
Does not support write operations.
.It Dv VFCF_SYNTHETIC
Pseudo file system, data does not represent on-disk files.
.It Dv VFCF_LOOPBACK
Loopback file system layer.
.It Dv VFCF_UNICODE
File names are stored as Unicode.
.It Dv VFCF_JAIL
Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. This bring huge amount of changes, I'll enumerate only user-visible changes: - Delegated Administration Allows regular users to perform ZFS operations, like file system creation, snapshot creation, etc. - L2ARC Level 2 cache for ZFS - allows to use additional disks for cache. Huge performance improvements mostly for random read of mostly static content. - slog Allow to use additional disks for ZFS Intent Log to speed up operations like fsync(2). - vfs.zfs.super_owner Allows regular users to perform privileged operations on files stored on ZFS file systems owned by him. Very careful with this one. - chflags(2) Not all the flags are supported. This still needs work. - ZFSBoot Support to boot off of ZFS pool. Not finished, AFAIK. Submitted by: dfr - Snapshot properties - New failure modes Before if write requested failed, system paniced. Now one can select from one of three failure modes: - panic - panic on write error - wait - wait for disk to reappear - continue - serve read requests if possible, block write requests - Refquota, refreservation properties Just quota and reservation properties, but don't count space consumed by children file systems, clones and snapshots. - Sparse volumes ZVOLs that don't reserve space in the pool. - External attributes Compatible with extattr(2). - NFSv4-ACLs Not sure about the status, might not be complete yet. Submitted by: trasz - Creation-time properties - Regression tests for zpool(8) command. Obtained from: OpenSolaris
2008-11-17 20:49:29 +00:00
Can be mounted from within a jail if
.Va security.jail.mount_allowed
sysctl is set to
.Dv 1 .
Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes. This bring huge amount of changes, I'll enumerate only user-visible changes: - Delegated Administration Allows regular users to perform ZFS operations, like file system creation, snapshot creation, etc. - L2ARC Level 2 cache for ZFS - allows to use additional disks for cache. Huge performance improvements mostly for random read of mostly static content. - slog Allow to use additional disks for ZFS Intent Log to speed up operations like fsync(2). - vfs.zfs.super_owner Allows regular users to perform privileged operations on files stored on ZFS file systems owned by him. Very careful with this one. - chflags(2) Not all the flags are supported. This still needs work. - ZFSBoot Support to boot off of ZFS pool. Not finished, AFAIK. Submitted by: dfr - Snapshot properties - New failure modes Before if write requested failed, system paniced. Now one can select from one of three failure modes: - panic - panic on write error - wait - wait for disk to reappear - continue - serve read requests if possible, block write requests - Refquota, refreservation properties Just quota and reservation properties, but don't count space consumed by children file systems, clones and snapshots. - Sparse volumes ZVOLs that don't reserve space in the pool. - External attributes Compatible with extattr(2). - NFSv4-ACLs Not sure about the status, might not be complete yet. Submitted by: trasz - Creation-time properties - Regression tests for zpool(8) command. Obtained from: OpenSolaris
2008-11-17 20:49:29 +00:00
.It Dv VFCF_DELEGADMIN
Supports delegated administration if
.Va vfs.usermount
sysctl is set to
.Dv 1 .
.It Dv VFCF_SBDRY
When in VFS method, the thread suspension is deferred to the user
boundary upon arrival of stop action.
.El
.Sh PSEUDOCODE
.Bd -literal
/*
* Fill in the fields for which we have special methods.
* The others are initially null. This tells vfs to change them to
* pointers to vfs_std* functions during file system registration.
*/
static struct vfsops myfs_vfsops = {
.vfs_mount = myfs_mount,
.vfs_root = myfs_root,
.vfs_statfs = myfs_statfs,
.vfs_unmount = myfs_unmount,
};
VFS_SET(myfs_vfsops, myfs, 0);
.Ed
.Sh SEE ALSO
.Xr jail 2 ,
.Xr jail 8 ,
.Xr DECLARE_MODULE 9 ,
.Xr vfs_modevent 9 ,
.Xr vfsconf 9
.Sh AUTHORS
This manual page was written by
.An Chad David Aq Mt davidc@acns.ab.ca .