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31 .\" @(#)quotactl.2 8.2 (Berkeley) 3/10/95
38 .Nd manipulate file system quotas
45 .Fn quotactl "const char *path" "int cmd" "int id" "void *addr"
49 system call enables, disables and
50 manipulates file system quotas.
51 A quota control command
54 operates on the given filename
56 for the given user or group
58 (NOTE: One should use the QCMD macro defined in
60 to formulate the value for
62 The address of an optional command specific data structure,
64 may be given; its interpretation
65 is discussed below with each command.
67 For commands that use the
69 identifier, it must be either -1 or any positive value.
70 The value of -1 indicates that the current UID or GID should be used.
71 Any other negative value will return an error.
73 Currently quotas are supported only for the
78 a command is composed of a primary command (see below)
79 and a command type used to interpret the
81 Types are supported for interpretation of user identifiers (USRQUOTA)
82 and group identifiers (GRPQUOTA).
85 specific commands are:
86 .Bl -tag -width Q_GETQUOTASIZEx
88 Enable disk quotas for the file system specified by
90 The command type specifies the type of the quotas being enabled.
93 argument specifies a file from which to take the quotas.
94 The quota file must exist;
95 it is normally created with the
101 Only the super-user may turn quotas on.
103 Disable disk quotas for the file system specified by
105 The command type specifies the type of the quotas being disabled.
110 arguments are unused.
111 Only the super-user may turn quotas off.
112 .It Dv Q_GETQUOTASIZE
113 Get the wordsize used to represent the quotas for the user or group
114 (as determined by the command type).
115 Possible values are 32 for the old-style quota file
116 and 64 for the new-style quota file.
119 argument is a pointer to an integer into which the size is stored.
124 Get disk quota limits and current usage for the user or group
125 (as determined by the command type) with identifier
132 structure (defined in
133 .In ufs/ufs/quota.h ) .
135 Set disk quota limits for the user or group
136 (as determined by the command type) with identifier
143 structure (defined in
144 .In ufs/ufs/quota.h ) .
145 The usage fields of the
147 structure are ignored.
148 This system call is restricted to the super-user.
150 Set disk usage limits for the user or group
151 (as determined by the command type) with identifier
158 structure (defined in
159 .In ufs/ufs/quota.h ) .
160 Only the usage fields are used.
161 This system call is restricted to the super-user.
163 Update the on-disk copy of quota usages.
164 The command type specifies which type of quotas are to be updated.
169 arguments are ignored.
176 system call will fail if:
179 The kernel has not been compiled with the
183 The quota table cannot be expanded.
188 or the command type is invalid.
195 quotas are not currently enabled for this file system.
208 the quota file is not a plain file.
210 Search permission is denied for a component of a path prefix.
212 A component of a path prefix was not a directory.
213 .It Bq Er ENAMETOOLONG
214 A component of either pathname exceeded 255 characters,
215 or the entire length of either path name exceeded 1023 characters.
217 A filename does not exist.
219 Too many symbolic links were encountered in translating a pathname.
223 either the file system on which quotas are to be enabled is mounted read-only
224 or the quota file resides on a read-only file system.
228 error occurred while reading from or writing
229 to a file containing quotas.
231 Corrupted data was detected while reading from the file system.
235 was supplied; the associated structure could not be copied in or out
241 points outside the process's allocated address space.
243 The call was privileged and the caller was not the super-user.
255 system call appeared in
258 There should be some way to integrate this call with the resource
259 limit interface provided by