137 lines
4.1 KiB
Groff
137 lines
4.1 KiB
Groff
.\"
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.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. 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(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), 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 COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" 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 SUCH
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.\" DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 8, 2001
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.Dt VFS_MOUNT 9
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.Os
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.Sh NAME
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.Nm vfs_mount
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.Nd "generic file system mount function"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/mount.h
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.Ft int
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.Fo vfs_mount
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.Fa "struct thread *td"
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.Fa "const char *fstype"
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.Fa "char *fspath"
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.Fa "int fsflags"
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.Fa "void *fsdata"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn vfs_mount
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function handles the generic portion of mounting a file system,
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and calls the file system specific mount function after verifying
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its parameters and setting up the structures expected by the
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underlying mount code.
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.Pp
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.Fn vfs_mount
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is called directly by the
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.Xr mount 2
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system call.
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.Pp
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Its arguments are:
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.Bl -tag -width ".Fa fsflags"
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.It Fa td
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The thread responsible for this call.
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.It Fa fstype
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The type of file system being mounted.
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.It Fa fspath
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The path to the mount point of the file system.
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.It Fa fsflags
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Flags controlling the mount.
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See
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.Xr mount 2
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for details.
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.Pp
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.Dv MNT_EXPORTED , MNT_NOSUID , MNT_NODEV , MNT_UPDATE , MNT_RELOAD ,
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.Dv MNT_FORCE , MNT_ASYNC , MNT_SYNCHRONOUS , MNT_UNION , MNT_NOATIME ,
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.Dv MNT_SNAPSHOT , MNT_NOCLUSTERR , MNT_NOCLUSTERW , MNT_IGNORE ,
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.Dv MNT_UNION , MNT_NOSYMFOLLOW
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.It Fa fsdata
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File system specific data structure.
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It is in userspace
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when passed to
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.Fn vfs_mount
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and is left untouched when passed to file system's
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.Fn mount .
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.El
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.Sh RETURN VALUES
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A 0 value is returned on success.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er ENAMETOOLONG
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The fs type or the mount point path is too long or any individual
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path component is too long.
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.It Bq Er EPERM
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Permission denied.
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There are a number of reason this can occur
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ranging from the user not having permission to mount a file system
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to the securelevel being to high to load the
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.Fa fstype
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module.
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.It Bq Er EINVAL
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Invalid operation (ex: trying to update a non mount-point).
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.It Bq Er ENOENT
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The mount point does not exist (from
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.Fn namei ) .
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.It Bq Er ELOOP
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The mount point is a muddle of links (from
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.Fn namei ) .
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.It Bq Er EOPNOTSUPP
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The operation is not supported (ex: reloading a r/w file system).
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.It Bq Er EBUSY
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The mount point is busy or is not really a mount point (on update).
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.It Bq Er ENOTDIR
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The mount point is not a directory.
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.It Bq Er ENODEV
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The kernel linker was unable to load the specified
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.Fa fstype
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or was unable to find the specified
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.Fa fstype
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module.
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.El
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.Pp
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Other errors can be returned by the file system's
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.Fn mount
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and
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you should check the specific file system for details.
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Also
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this call relies on a large number of other kernel services
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whose errors it returns so this list may not be exhaustive.
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.Sh SEE ALSO
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.Xr mount 2 ,
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.Xr mount 8 ,
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.Xr vfs_mountedon 9
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.Pp
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.Va vfs.usermount
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.Sh AUTHORS
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This man page was written by
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.An Chad David Aq davidc@acns.ab.ca .
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