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36 .Nd manipulate file system quotas
43 .Fn quotactl "const char *path" "int cmd" "int id" "void *addr"
47 system call enables, disables and
48 manipulates file system quotas.
49 A quota control command
52 operates on the given filename
54 for the given user or group
56 (NOTE: One should use the QCMD macro defined in
58 to formulate the value for
60 The address of an optional command specific data structure,
62 may be given; its interpretation
63 is discussed below with each command.
65 For commands that use the
67 identifier, it must be either -1 or any positive value.
68 The value of -1 indicates that the current UID or GID should be used.
69 Any other negative value will return an error.
71 Currently quotas are supported only for the
76 a command is composed of a primary command (see below)
77 and a command type used to interpret the
79 Types are supported for interpretation of user identifiers (USRQUOTA)
80 and group identifiers (GRPQUOTA).
83 specific commands are:
84 .Bl -tag -width Q_GETQUOTASIZEx
86 Enable disk quotas for the file system specified by
88 The command type specifies the type of the quotas being enabled.
91 argument specifies a file from which to take the quotas.
92 The quota file must exist;
93 it is normally created with the
99 Only the super-user may turn quotas on.
101 Disable disk quotas for the file system specified by
103 The command type specifies the type of the quotas being disabled.
108 arguments are unused.
109 Only the super-user may turn quotas off.
110 .It Dv Q_GETQUOTASIZE
111 Get the wordsize used to represent the quotas for the user or group
112 (as determined by the command type).
113 Possible values are 32 for the old-style quota file
114 and 64 for the new-style quota file.
117 argument is a pointer to an integer into which the size is stored.
122 Get disk quota limits and current usage for the user or group
123 (as determined by the command type) with identifier
130 structure (defined in
131 .In ufs/ufs/quota.h ) .
133 Set disk quota limits for the user or group
134 (as determined by the command type) with identifier
141 structure (defined in
142 .In ufs/ufs/quota.h ) .
143 The usage fields of the
145 structure are ignored.
146 This system call is restricted to the super-user.
148 Set disk usage limits for the user or group
149 (as determined by the command type) with identifier
156 structure (defined in
157 .In ufs/ufs/quota.h ) .
158 Only the usage fields are used.
159 This system call is restricted to the super-user.
161 Update the on-disk copy of quota usages.
162 The command type specifies which type of quotas are to be updated.
167 arguments are ignored.
174 system call will fail if:
177 The kernel has not been compiled with the
181 The quota table cannot be expanded.
186 or the command type is invalid.
193 quotas are not currently enabled for this file system.
206 the quota file is not a plain file.
208 Search permission is denied for a component of a path prefix.
210 A component of a path prefix was not a directory.
211 .It Bq Er ENAMETOOLONG
212 A component of either pathname exceeded 255 characters,
213 or the entire length of either path name exceeded 1023 characters.
215 A filename does not exist.
217 Too many symbolic links were encountered in translating a pathname.
221 either the file system on which quotas are to be enabled is mounted read-only
222 or the quota file resides on a read-only file system.
226 error occurred while reading from or writing
227 to a file containing quotas.
229 Corrupted data was detected while reading from the file system.
233 was supplied; the associated structure could not be copied in or out
239 points outside the process's allocated address space.
241 The call was privileged and the caller was not the super-user.
253 system call appeared in
256 There should be some way to integrate this call with the resource
257 limit interface provided by