291 lines
7.3 KiB
Groff
291 lines
7.3 KiB
Groff
.\"-
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.\" Copyright (c) 2009 Dag-Erling Coïdan Smørgrav and
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.\" Marshall Kirk McKusick. 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 December 28, 2009
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.Dt QUOTAFILE 3
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.Os
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.Sh NAME
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.Nm quota_open
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.Nm quota_close
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.Nm quota_on
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.Nm quota_off
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.Nm quota_read
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.Nm quota_write_limits
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.Nm quota_write_usage
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.Nm quota_fsname
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.Nm quota_qfname
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.Nm quota_maxid
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.Nm quota_check_path
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.Nm quota_convert
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.Nd "Manipulate quotas"
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.Sh LIBRARY
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.Lb libutil
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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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.In ufs/ufs/quota.h
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.In fcntl.h
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.In fstab.h
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.In libutil.h
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.Ft "struct quotafile *"
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.Fn quota_open "struct fstab *fs" "int quotatype" "int openflags"
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.Ft int
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.Fn quota_close "struct quotafile *qf"
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.Ft int
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.Fn quota_on "const struct quotafile *qf"
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.Ft int
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.Fn quota_off "const struct quotafile *qf"
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.Ft int
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.Fn quota_read "struct quotafile *qf" "struct dqblk *dqb" "int id"
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.Ft int
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.Fn quota_write_limits "struct quotafile *qf" "struct dqblk *dqb" "int id"
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.Ft int
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.Fn quota_write_usage "struct quotafile *qf" "struct dqblk *dqb" "int id"
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.Ft "const char *"
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.Fn quota_fsname "const struct quotafile *qf"
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.Ft "const char *"
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.Fn quota_qfname "const struct quotafile *qf"
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.Ft int
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.Fn quota_maxid "const struct quotafile *qf"
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.Ft int
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.Fn quota_check_path "const struct quotafile *qf" "const char *path"
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.Ft int
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.Fn quota_convert "struct quotafile *qf" "int wordsize"
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.Sh DESCRIPTION
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These functions are designed to simplify access to filesystem quotas.
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If quotas are active on a filesystem,
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these functions will access them directly from the kernel using the
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.Fn quotactl
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system call.
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If quotas are not active,
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these functions will access them by reading and writing
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the quota files directly.
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.Pp
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The
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.Fn quota_open
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function takes a pointer to an
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.Vt fstab
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entry corresponding to the filesystem on which quotas
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are to be accessed.
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The
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.Va quotatype
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field indicates the type of quotas being sought, either
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.Dv USRQUOTA
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or
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.Dv GRPQUOTA .
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The
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.Va openflags
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are those used by the
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.Fn open
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system call, usually either
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.Dv O_RDONLY
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if the quotas are just to be read, or
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.Dv O_RDWR
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if the quotas are to be updated.
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The
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.Dv O_CREAT
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flag should be specified if a new quota file of the requested type
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should be created if it does not already exist.
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.Pp
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The
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.Fn quota_close
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function closes any open file descriptors and frees any storage
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associated with the filesystem and quota type referenced by
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.Va qf .
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.Pp
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The
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.Fn quota_on
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function enables quotas for the filesystem associated with its
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.Va qf
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argument which may have been opened with
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.Dv O_RDONLY
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or
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.Dv O_RDWR .
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The
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.Fn quota_on
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function returns 0 if successful;
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otherwise the value\~-1 is returned and the global variable
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.Va errno
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is set to indicate the error, see
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.Xr quotactl 2
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for the possible errors.
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.Pp
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The
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.Fn quota_off
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function disables quotas for the filesystem associated with its
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.Va qf
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argument which may have been opened with
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.Dv O_RDONLY
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or
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.Dv O_RDWR .
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The
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.Fn quota_off
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function returns 0 if successful;
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otherwise the value\~-1 is returned and the global variable
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.Va errno
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is set to indicate the error, see
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.Xr quotactl 2
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for the possible errors.
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.Pp
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The
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.Fn quota_read
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function reads the quota from the filesystem and quota type referenced by
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.Va qf
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for the user (or group) specified by
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.Va id
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into the
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.Vt dqblk
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quota structure pointed to by
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.Va dqb .
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.Pp
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The
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.Fn quota_write_limits
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function updates the limit fields (but not the usage fields)
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for the filesystem and quota type referenced by
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.Va qf
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for the user (or group) specified by
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.Va id
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from the
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.Vt dqblk
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quota structure pointed to by
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.Va dqb .
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.Pp
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The
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.Fn quota_write_usage
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function updates the usage fields (but not the limit fields)
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for the filesystem and quota type referenced by
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.Va qf
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for the user (or group) specified by
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.Va id
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from the
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.Vt dqblk
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quota structure pointed to by
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.Va dqb .
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.Pp
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The
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.Fn quota_fsname
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function returns a pointer to a buffer containing the path to the root
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of the file system that corresponds to its
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.Va qf
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argument, as listed in
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.Pa /etc/fstab .
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Note that this may be a symbolic link to the actual directory.
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.Pp
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The
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.Fn quota_qfname
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function returns a pointer to a buffer containing the name of the
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quota file that corresponds to its
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.Va qf
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argument.
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Note that this may be a symbolic link to the actual file.
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.Pp
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The
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.Fn quota_maxid
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function returns the maximum user (or group)
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.Va id
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contained in the quota file associated with its
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.Va qf
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argument.
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.Pp
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The
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.Fn quota_check_path
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function checks if the specified path is within the filesystem that
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corresponds to its
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.Va qf
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argument.
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If the
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.Va path
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argument refers to a symbolic link,
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.Fn quota_check_path
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will follow it.
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.Pp
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The
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.Fn quota_convert
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function converts the quota file associated with its
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.Va qf
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argument to the data size specified by its
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.Va wordsize
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argument.
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The supported wordsize arguments are 32 for the old 32-bit
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quota file format and 64 for the new 64-bit quota file format.
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The
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.Fn quota_convert
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function may only be called to operate on quota files that
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are not currently active.
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.Sh IMPLEMENTATION NOTES
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If the underlying quota file is in or converted to the old 32-bit format,
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limit and usage values written to the quota file will be clipped to 32 bits.
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.Sh RETURN VALUES
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If the filesystem has quotas associated with it,
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.Fn quota_open
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returns a pointer to a
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.Vt quotafile
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structure used in subsequent quota access calls.
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If the filesystem has no quotas, or access permission is denied
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.Dv NULL
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is returned and
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.Va errno
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is set to indicate the error.
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.Pp
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The
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.Fn quota_check_path
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function returns\~1 for a positive result and\~0 for a negative
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result.
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If an error occurs, it returns\~-1 and sets
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.Va errno
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to indicate the error.
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.Pp
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The
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.Fn quota_read ,
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.Fn quota_write_limits ,
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.Fn quota_write_usage ,
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.Fn quota_convert ,
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and
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.Fn quota_close
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functions return zero on success.
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On error they return\~-1
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and set
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.Va errno
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to indicate the error.
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.Sh SEE ALSO
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.Xr quotactl 2 ,
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.Xr quota.user 5 ,
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.Xr quota.group 5
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.Sh HISTORY
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The
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.Nm quotafile
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functions first appeared in
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.Fx 8.1 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm quotafile
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functions and this manual page were written by
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.An Dag-Erling Sm\(/orgrav Aq Mt des@FreeBSD.org
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and
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.An Marshall Kirk McKusick Aq Mt mckusick@mckusick.com .
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