package Quota; require Exporter; use AutoLoader; require DynaLoader; @ISA = qw(Exporter DynaLoader); @EXPORT = (); $VERSION = '1.5.1'; bootstrap Quota; use Carp; use POSIX qw(:errno_h); use strict; ## ## Get block device for locally mounted file system ## !! Do not use this to get the argument for the quota-functions in this ## !! module, since not all operating systems use the device path for the ## !! quotactl system call and e.g. Solaris doesn't even use a system call ## !! Always use getqcarg() instead. ## sub getdev { ($#_ > 0) && croak("Usage: Quota::getdev(path)"); my($target) = (($#_ == -1) ? "." : $_[0]); my($dev) = (stat($target))[0]; my($ret) = undef; my($fsname,$path); if($dev && ($target ne "") && !Quota::setmntent()) { while(($fsname,$path) = Quota::getmntent()) { ($ret=$fsname, last) if ($dev == (stat($path))[0]); } $! = 0; } Quota::endmntent(); $ret; } ## ## Get "device" argument for this module's Quota-functions ## sub getqcarg { ($#_ > 0) && croak("Usage: Quota::getqcarg(path)"); my($target) = (($#_ == -1) ? "." : $_[0]); my($dev) = (stat($target))[0]; my($ret) = undef; my($argtyp,$fsupp) = (Quota::getqcargtype() =~ /([^,]*)(,.*)?/); my($fsname,$path,$fstyp); if(defined($dev) && ($target ne "") && !Quota::setmntent()) { while(($fsname,$path,$fstyp) = Quota::getmntent()) { next if $fstyp =~ /^(lofs|ignore|auto.*|proc)$/; my($pdev) = (stat($path))[0]; if (defined($pdev) && ($dev == $pdev)) { if($fsname =~ m|^[^/]+:/|) { $ret = $fsname } #NFS host:/path elsif (($fstyp =~ /^nfs/i) && ($fsname =~ m#^(/.*)\@([^/]+)$#)) { $ret = "$2:$1" } #NFS /path@host elsif($argtyp eq "dev") { $ret = $fsname } elsif($argtyp eq "qfile") { $ret = "$path/quotas" } elsif($argtyp eq "any") { $ret = $target } else { $ret = $path } #($argtyp eq "mntpt") # XFS, VxFS and AFS quotas require separate access methods # (optional for VxFS: later versions use 'normal' quota interface) if (($fstyp eq "xfs") && ($fsupp =~ /,XFS/)) { $ret = "(XFS)$ret" } elsif(($fstyp eq "vxfs") && defined($fsupp) && ($fsupp =~ /,VXFS/)) { $ret = "(VXFS)$ret" } elsif((($fstyp eq "afs") || ($fsname eq "AFS")) && ($fsupp =~ /,AFS/)) { $ret = "(AFS)$target"; } last; } } $! = 0; } Quota::endmntent(); $ret; } ## ## Translate error codes of quotactl syscall and ioctl ## sub strerr { ($#_ != -1) && croak("Usage: Quota::strerr()"); my($str); eval { if(($! == &EINVAL) || ($! == &ENOTTY) || ($! == &ENOENT)) { $str = "No quotas on this system" } elsif($! == &ENODEV) { $str = "Not a standard file system" } elsif($! == &EPERM) { $str = "Not privileged" } elsif($! == &EACCES) { $str = "Access denied" } elsif($! == &ESRCH) { $str = "No quota for this user" } elsif($! == &EUSERS) { $str = "Quota table overflow" } else { die "unknown quota error\n" } }; if($@) { my($err) = $! + 0; $str = "error #$err"; }; $str; } package Quota; # return to package Quota so AutoSplit is happy 1; __END__ =head1 NAME Quota - Perl interface to file system quotas =head1 SYNOPSIS use Quota; ($block_curr, $block_soft, $block_hard, $block_timelimit, $inode_curr, $inode_soft, $inode_hard, $inode_timelimit) = Quota::query($dev [,$uid [,isgrp]]); ($block_curr, $block_soft, $block_hard, $block_timelimit, $inode_curr, $inode_soft, $inode_hard, $inode_timelimit) = Quota::rpcquery($host, $path [,$uid]); Quota::rpcpeer([$port [,$use_tcp [,timeout]]]); Quota::rpcauth([$uid [,$gid [,$hostname]]]); Quota::setqlim($dev, $uid, $block_soft, $block_hard, $inode_soft, $inode_hard [,$tlo [,isgrp]]); Quota::sync([$dev]); $arg = Quota::getqcarg([$path]); Quota::setmntent(); ($dev, $path, $type, $opts) = Quota::getmntent(); Quota::endmntent(); =head1 DESCRIPTION The B module provides access to file system quotas. The quotactl system call or ioctl is used to query or set quotas on the local host, or queries are submitted via RPC to a remote host. Mount tables can be parsed with B and paths can be translated to device files (or whatever the actual B implementations needs as argument) of the according file system. =head2 Functions =over 4 =item I<($bc,$bs,$bh,$bt, $ic,$is,$ih,$it) = Quota::query($dev, $uid, $isgrp)> Get current usage and quota limits for a given file system and user. The user is specified by its numeric uid; defaults to the process' real uid. The type of I<$dev> varies from system to system. It's the argument which is used by the B implementation to address a specific file system. It may be the path of a device file (e.g. B) or the path of the mount point or the quotas file at the top of the file system (e.g. B). However you do not have to worry about that; use B to automatically translate any path inside a file system to the required I<$dev> argument. I<$dev> may also be in the form of B, which has the module transparently query the given host via a remote procedure call (RPC). In case you have B (or similar network mounts), this type of argument may also be produced by B. Note: RPC queries require I to be running on the target system. If the daemon or host are down, the timeout is 12 seconds. In I<$bc> and I<$ic> the current usage in blocks and inodes is returned. I<$bs> and I<$is> are the soft limits, I<$bh> and I<$ih> hard limits. If the soft limit is exceeded, writes by this user will fail for blocks or inodes after I<$bt> or I<$it> is reached. These times are expressed as usual, i.e. in elapsed seconds since 00:00 1/Jan/1970 GMT. Note: When the quota limits are not exceeded, the timestamps are meaningless and should be ignored. When hard and soft limits are zero, there is no limit for that user. On most systems Quota::query will return undef in that case and errno will be set to ESRCH. When I<$isgrp> is given and set to 1, I<$uid> is taken as gid and group quotas are queried. This is B supported across RPC and even locally only on a few architectures (e.g. Linux and other BSD based Unix variants, OSF/1 and AIX - check the quotactl(2) man page on your systems). If unsupported, this flag is ignored. =item I Sets quota limits for the given user. Meanings of I<$dev>, I<$uid>, I<$bs>, I<$bh>, I<$is> and I<$ih> are the same as in B. I<$tlo> decides how the time limits are initialized: I<0>: The time limits are set to B, i.e. the time limits are not initialized until the first write attempt by this user. This is the default. I<1>: The time limits are set to B<7.0 days>. More alternatives (i.e. setting a specific time) aren't available in most implementations. When I<$isgrp> is given and set to 1, I<$uid> is taken as gid and group quota limits are set. This is supported only on a few architectures (see above). If unsupported, this flag is ignored. Note: if you want to set the quota of a particular user to zero, i.e. no write permission, you must not set all limits to zero, since that is equivalent to unlimited access. Instead set only the hard limit to 0 and the soft limit for example to 1. Note that you cannot set quotas via RPC. =item I Have the kernel update the quota file on disk or all quota files if no argument given (the latter doesn't work on all systems, in particular on B). The main purpose of this function is to check if quota is enabled in the kernel and for a particular file system. Read the B man page on how to enable quotas on a file system. Note: on some systems this function always returns a success indication, even on partitions which do not have quotas enabled (e.g. Linux 2.4). This is not a bug in this module; it's a limitation in certain kernels. =item I<($bc,$bs,$bh,$bt, $ic,$is,$ih,$it) => I This is equivalent to B, i.e. query quota for a given user on a given remote host via RPC. I<$path> is the path of any file or directory inside the wanted file system on the remote host. =item I Configure parameters for subsequent RPC queries; all parameters are optional. By default the portmapper on the remote host is used (i.e. default port is 0, protocol is UDP) The default timeout is 4 seconds. =item I Configure authorization parameters for subsequent RPC queries; all parameters are optional. By default uid and gid are taken from owner of the process and hostname is the host name of current machine. =item I<$arg = Quota::getqcarg($path)> Get the required I<$dev> argument for B and B for the file system you want to operate on. I<$path> is any path of an existing file or directory inside that file system. The path argument is optional and defaults to the current working directory. The type of I<$dev> varies between operating systems, i.e. different implementations of the quotactl functionality. Hence it's important for compatibility to always use this module function and not really pass a device file to B (as returned by B). See also above at I =item I<$dev = Quota::getdev($path)> Returns the device entry in the mount table for a particular file system, specified by any path of an existing file or directory inside it. I<$path> defaults to the working directory. This device entry need not really be a device. For example on network mounts (B) it's I<"host:mountpath">, with I it may be something completely different. I use this to produce a I<$dev> argument for other functions of this module, since it's not compatible. On some systems I does not work on devices but on the I file or some other kind of argument. Always use B. =item I Opens or resets the mount table. This is required before the first invocation of B. Note: on some systems there is no equivalent function in the C library. But you still have to call this module procedure for initialization of module-internal variables. =item I<($dev, $path, $type, $opts) = Quota::getmntent()> Returns the next entry in the system mount table. This table contains information about all currently mounted (local or remote) file systems. The format and location of this table (e.g. B) vary from system to system. This function is provided as a compatible way to parse it. (On some systems, like B, this table isn't accessible as a file at all, i.e. only via B). =item I Close the mount table. Should be called after the last use of B to free possibly allocated file handles and memory. Always returns undef. =item I Translates B<$!> to a quota-specific error text. You should always use this function to output error messages, since the normal messages don't always make sense for quota errors (e.g. I: B, here: B) Note that this function only returns a defined result if you called a Quota command directly before which returned an error indication. =head1 RETURN VALUES Functions that are supposed return lists or scalars, return I upon errors. As usual B<$!> contains the error code (see B). B always returns I. All other functions return 0 upon success, non-zero integer otherwise. =head1 EXAMPLES An example for each function can be found in the test script I. See also the contrib directory, which contains some longer scripts, kindly donated by users of the module. =head1 BUGS With remote quotas we have to rely on the remote system to state correctly which block size the quota values are referring to. Old versions of the Linux rpc.rquotad reported a block size of 4 kilobytes, which was wildly incorrect. For more info on this and other Linux bugs please see INSTALL. =head1 AUTHORS This module was created 1995 by Tom Zoerner (email: tomzo AT nefkom DOT net) and since then continually improved and ported to many operating- and file-systems. Numerous people have contributed to this process; for a complete list of names please see the CHANGES document. =head1 SEE ALSO perl(1), edquota(1m), quotactl(2) or quotactl(7I), mount(1m), mtab(4) or mnttab(4), quotaon(1m), setmntent(3), getmntent(3) or getmntinfo(3), endmntent(3), rpc(3), rquotad(1m). =cut