1 QUOTACTL(7I) Ioctl Requests QUOTACTL(7I)
2
3 NAME
4 quotactl - manipulate disk quotas
5
6 SYNOPSIS
7 #include <sys/fs/ufs_quota.h>
8
9 int ioctl(int fd, Q_QUOTACTL, struct quotctl *qp);
10
11 DESCRIPTION
12 This ioctl() call manipulates disk quotas. fd is the file descriptor
13 returned by the open(2) system call after opening the quotas file
14 (located in the root directory of the filesystem running quotas).
15 Q_QUOTACTL is defined in /usr/include/sys/fs/ufs_quota.h. qp is the
16 address of the quotctl structure which is defined as
17
18 struct quotctl {
19 int op;
20 uid_t uid;
21 caddr_t addr;
22 };
23
24 op indicates an operation to be applied to the user ID uid. (See below.)
25 addr is the address of an optional, command specific, data structure
26 which is copied in or out of the system. The interpretation of addr is
27 given with each value of op below.
28
29 Q_QUOTAON Turn on quotas for a file system. addr points to the full
30 pathname of the quotas file. uid is ignored. It is
31 recommended that uid have the value of 0. This call is
32 restricted to the super-user.
33
34 Q_QUOTAOFF Turn off quotas for a file system. addr and uid are ignored.
35 It is recommended that addr have the value of NULL and uid
36 have the value of 0. This call is restricted to the super-
37 user.
38
39 Q_GETQUOTA Get disk quota limits and current usage for user uid. addr
40 is a pointer to a dqblk structure (defined in
41 <sys/fs/ufs_quota.h>). Only the super-user may get the
42 quotas of a user other than himself.
43
44 Q_SETQUOTA Set disk quota limits and current usage for user uid. addr
45 is a pointer to a dqblk structure (defined in
46 <sys/fs/ufs_quota.h>). This call is restricted to the super-
47 user.
48
49 Q_SETQLIM Set disk quota limits for user uid. addr is a pointer to a
50 dqblk structure (defined in <sys/fs/ufs_quota.h>). This call
51 is restricted to the super-user.
52
53 Q_SYNC Update the on-disk copy of quota usages for this file system.
54 addr and uid are ignored.
55
56 Q_ALLSYNC Update the on-disk copy of quota usages for all file systems
57 with active quotas. addr and uid are ignored.
58
59 RETURN VALUES
60 This Fn ioctl returns:
61
62 0 on success.
63
64 -1 on failure and sets errno to indicate the error.
65
66 FILES
67 /usr/include/sys/fs/ufs_quota.h
68 quota-related structure/function definitions and defines
69
70 ERRORS
71 EFAULT addr is invalid.
72
73 EINVAL The kernel has not been compiled with the QUOTA option. op is
74 invalid.
75
76 ENOENT The quotas file specified by addr does not exist.
77
78 EPERM The call is privileged and the calling process did not assert
79 {PRIV_SYS_MOUNT} in the effective set.
80
81 ESRCH No disk quota is found for the indicated user. Quotas have not
82 been turned on for this file system.
83
84 EUSERS The quota table is full.
85
86 If op is Q_QUOTAON, ioctl() may set errno to:
87
88 EACCES The quota file pointed to by addr exists but is not a regular
89 file. The quota file pointed to by addr exists but is not on the
90 file system pointed to by special.
91
92 EIO Internal I/O error while attempting to read the quotas file
93 pointed to by addr.
94
95 SEE ALSO
96 quota(1M), quotacheck(1M), quotaon(1M), getrlimit(2), mount(2)
97
98 BUGS
99 There should be some way to integrate this call with the resource limit
100 interface provided by setrlimit(2) and getrlimit(2).
101
102 This call is incompatible with Melbourne quotas.
103
104 illumos October 28, 2017 illumos