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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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Q_QUOTAON(2const) Q_QUOTAON(2const)
Q_QUOTAON - turn on quotas for a filesystem
Standard C library (libc, -lc)
#include <sys/quota.h>
int quotactl(QCMD(Q_QUOTAON, type), const char *_Nullable special,
int fmt, caddr_t quota_path);
#include <sys/quota.h> /* Definition of Q_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
int syscall(SYS_quotactl_fd, int fd, QCMD(Q_QUOTAON, type));
Turn on quotas for a filesystem.
The fmt argument is the identification number of the quota format
to be used. Currently, there are three supported quota formats:
QFMT_VFS_OLD
The original quota format.
QFMT_VFS_V0
The standard VFS v0 quota format, which can handle 32-bit
UIDs and GIDs and quota limits up to 2^42 bytes and 2^32
inodes.
QFMT_VFS_V1
A quota format that can handle 32-bit UIDs and GIDs and
quota limits of 2^63 - 1 bytes and 2^63 - 1 inodes.
The quota_path argument points to the pathname of a file
containing the quotas for the filesystem. The quota file must
exist; it is normally created with the quotacheck(8) program
Quota information can be also stored in hidden system inodes for
ext4, XFS, and other filesystems if the filesystem is configured
so. In this case, there are no visible quota files and there is
no need to use quotacheck(8). Quota information is always kept
consistent by the filesystem and the Q_QUOTAON operation serves
only to enable enforcement of quota limits. The presence of
hidden system inodes with quota information is indicated by the
DQF_SYS_FILE flag in the dqi_flags field returned by the
Q_GETINFO(2const) operation.
The quotactl_fd() variant of this system call doesn't have the
quota_path and fmt arguments, so the Q_QUOTAON operation of
quotactl_fd() is only suitable for work with hidden system inodes.
This operation requires privilege (CAP_SYS_ADMIN).
See quotactl(2).
See quotactl(2).
EACCES The quota file pointed to by quota_path exists, but is not
a regular file or is not on the filesystem pointed to by
special.
EBUSY Another Q_QUOTAON had already been performed.
EINVAL The specified quota file is corrupted.
ESRCH The specified quota format was not found.
Linux.
Linux.
quotactl(2), quotactl_fd(2), Q_QUOTAOFF(2const), quotacheck(8)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2026-09-09. If you discover any rendering problems in this HTML
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man-pages@man7.org
Linux man-pages 6.19 2026-06-05 Q_QUOTAON(2const)
Pages that refer to this page: Q_GETFMT(2const), Q_QUOTAOFF(2const), quotactl(2)
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HTML rendering created 2026-09-09 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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