Q_SETQUOTA(2const)

💅 Q_SETQUOTA (2const) 💅

okay bestie, welcome to the quota corner of the Linux manual pages — this is Q_SETQUOTA, a quotactl(2) operation, and it's giving authority. ✨

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🌸 NAME 🌸

Q_SETQUOTA — set quota information for user or group 🫶

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📚 LIBRARY 📚

Standard C library (libc, -lc) — she lives in libc, periodt.

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✨ SYNOPSIS ✨

#include <sys/quota.h>

int quotactl(QCMD(Q_SETQUOTA, type), const char *_Nullable special,
             int id, caddr_t addr);

#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_SETQUOTA, type),
             int id, struct dqblk *addr);

two ways to get in: the classic quotactl() way and the syscall(SYS_quotactl_fd, ...) way. both valid, both iconic 💖

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💖 DESCRIPTION 💖

So like, this sets quota info for a user or group id, using whatever you stuffed into the dqblk(2type) structure that addr points at. 📝

The .dqb_valid field of that dqblk(2type) structure is the vibe check — it tells everyone which entries in the structure the caller actually set. so like, if you didn't mark it valid, bestie, it doesn't count. 🙈

⚠️ Heads up: this operation requires privilege — specifically CAP_SYS_ADMIN. no cap, you need the cap. 👑

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🔥 RETURN VALUE 🔥

See quotactl(2). (yes literally, go read that one, she has the receipts 💅)

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😭 ERRORS 😭

See quotactl(2).

Also, one of her own:

• ERANGE — The specified limits are out of the range allowed by the quota format. 💀 like girl, those numbers are simply not it, the quota format said no.

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👑 STANDARDS 👑

Linux. that's it, that's the standard. 🐧

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🦋 HISTORY 🦋

Linux.

This operation supersedes the Q_SETQLIM and Q_SETUSE operations in the previous quota interfaces. so if you're still out here using those, bestie... it's giving vintage. retro. nostalgic. move on. 🌈

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🌟 SEE ALSO 🌟

• quotactl(2)
• quotactl_fd(2)
• dqblk(2type)

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okay that's the whole page, you ate it, you understood it, slay 🎀💜

this was Linux man-pages 6.20, dated 2026-06-05 — mwah, xoxo bestie, go set some quotas responsibly 🧚🍓