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13 .\"    may be used to endorse or promote products derived from this software
17 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 .EH 'SMM:4-%''Disc Quotas in a \s-2UNIX\s+2 Environment'
29 .OH 'Disc Quotas in a \s-2UNIX\s+2 Environment''SMM:4-%'
32 Disc Quotas in a \s-2UNIX\s+2\s-3\u*\d\s0 Environment
62 \s-2VMUNIX\s0 that may be included when the
90 that the user is expected to remain below.
95 requests for space (or attempts to create a file)
97 this occurs, a message will be written to the user's
101 in order to avoid continual noise from those
114 more resources will be allocated to the user.
115 The \fBonly\fP way to reset this condition is
120 In most cases, the only way to recover from over
121 quota conditions, is to abort whatever activity was in progress
123 sufficient files to bring the limit back below quota,
129 that initially attempting to write the file
138 He may use the editor \fB!\fP shell escape command to
142 A third possibility, is to write the file to
143 some other filesystem (perhaps to a file on /tmp)
146 the file can be moved back to the filesystem
152 there are several steps necessary to be performed
155 First, the system must be configured to include
156 the disc quota sub-system.
163 followed by a system configuration\s-3\u*\d\s0.
168 Second, a decision as to what filesystems need to have
169 quotas applied needs to be made.
171 or other user files, will need to be subjected to
172 the quota system, though it may also prove useful to
176 Having decided on which filesystems quotas need to be
183 command can be used to actually set the limits desired upon
184 each user. Where a number of users are to be given the
185 same quotas (a common occurrence) the \fB\-p\fP switch
186 to edquota will allow this to be easily accomplished.
188 Once the quotas are set, ready to operate, the system
189 must be informed to enforce quotas on the desired filesystems.
195 with the \fB\-a\fP switch, will enable quotas for each
203 /etc/quotaon -a
207 Should quotas need to be disabled, the
210 about to be dismounted, the
223 the actual number of blocks and files allocated to
227 command can be used to accomplish this.
228 It is not necessary to dismount the filesystem, or disable
229 the quota system to run this command, though on
235 The super-user may use the
237 command to examine the usage and quotas of any user, and
240 command may be used to check the usages and limits for
246 filesystem that the quotas are to be applied to.
249 While this name is not known to the system in any way,
257 in it, which would be lost by copying, so it is best to
274 In memory, the quota information is kept hashed by user-id
283 opportunity to object.
287 cpu time consumed in writing a new block to disc.
292 early scheme implemented at the University of New South
293 Wales, and Sydney University in the mid 70's. That system
299 chown's (etc) did not affect quotas, nor did i/o to a file
308 subject to change to be considered for distribution.
310 For the 4.2BSD release, much work has been done to clean