Q_XSETQLIM(2const)

✨ Q_XSETQLIM 💅✨

okay bestie, welcome to the Q_XSETQLIM(2const) page — yes that's a const page, it's a lil baby slice of the big quotactl(2) story, but it's OUR slice and it's iconic.

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🌸 NAME 🌸

Q_XSETQLIM — set quota limits. yeah. that's the whole vibe. you're the main character setting the limits, not living by them 💖

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📚 LIBRARY 📚

Standard C library (libc, -lc). the classic. the OG. she's been here forever and she's not leaving 🫶

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🎀 SYNOPSIS 🎀

okay so there's two ways to slide into this, depending on which function you're using. look:

#include <xfs/xqm.h>      /* See quotactl(2) */
#include <sys/quota.h>

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

and then the fd-flavoured one:

#include <xfs/xqm.h>      /* See quotactl_fd(2) */
#include <sys/syscall.h>  /* Definition of SYS_* constants */
#include <unistd.h>

int syscall(SYS_quotactl_fd, int fd, QCMD(Q_XSETQLIM, type),
            int id, struct fs_disk_quota *addr);

note: that #include <xfs/xqm.h> is doing a whole lot of heavy lifting — go read quotactl(2) and quotactl_fd(2) for the deets, iykyk 🦋

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🔥 DESCRIPTION 🔥

Set disk quota limits for user id. literally what it says. you're the one in charge now 👑

the addr argument is a pointer to an fs_disk_quota(2type) structure — so that's where all your actual limit numbers live, bestie.

⚠️ heads up: this operation requires privilege (CAP_SYS_ADMIN). no cap, no limits. the kernel does NOT care how cute your struct is 💀

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⭐ RETURN VALUE ⭐

See quotactl(2). (all the return-value lore lives over there, go peek 💜)

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😭 ERRORS 😭

See quotactl(2). (same deal, the error tea is all on that page 🍓)

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🌈 STANDARDS 🌈

Linux. that's it. that's the standard. home turf 🎀

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🧚 HISTORY 🧚

Linux. yep. also Linux. she's been Linux the whole time ✨

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👑 SEE ALSO 👑

• quotactl(2)
• quotactl_fd(2)
• fs_disk_quota(2type)

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and that's the whole page, bestie 💅 go forth and enforce some limits responsibly (or don't, it needs CAP_SYS_ADMIN anyway 🙈).

this adorable lil rewrite is brought to you by Linux man-pages 6.20, dated 2026-06-05 — mwah, stan the man-pages team 🫶💖