Q_GETNEXTQUOTA(2const)

✨ Q_GETNEXTQUOTA 💖 (the Q_GETNEXTQUOTA(2const) glow-up)

okay bestie, listen — this is a <sys/quota.h> constant page, the kind that comes bundled with quotactl(2). it's short, it's sweet, it's giving "quietly running your whole filesystem's vibe check" energy. let's go 🌸

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🌈 NAME

Q_GETNEXTQUOTA — get disk quota limits and current usage for the next user or group 🫶

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📚 LIBRARY

Standard C library (libc, -lc) — she's built in, no extra credit needed 💅

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🎀 SYNOPSIS

okay so here's the whole squad. first, the classic quotactl() route:

#include <sys/quota.h>

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

then the fd-based syscall route, with all the includes you need:

#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_GETNEXTQUOTA, type),
            int id, struct nextdqblk *addr);

and here's the struct, the main character herself ✨:

#include <sys/quota.h>

struct nextdqblk {
     uint64_t  dqb_bhardlimit;
     uint64_t  dqb_bsoftlimit;
     uint64_t  dqb_curspace;
     uint64_t  dqb_ihardlimit;
     uint64_t  dqb_isoftlimit;
     uint64_t  dqb_curinodes;
     uint64_t  dqb_btime;
     uint64_t  dqb_itime;

     uint32_t  dqb_valid;

     uint32_t  dqb_id;
};

like. look at her. immaculate. 🧚

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💖 DESCRIPTION

ngl this operation is literally the same as Q_GETQUOTA(2const) — except it doesn't come back with the ID you asked for, it comes back with the next ID that's >= id and actually has a quota set. it's the "who's next in line with a quota" move. so iconic of her 👑

the addr argument is a pointer to a nextdqblk structure, and its fields are exactly like the ones in dqblk(2type)… with one addition: a .dqb_id field that hands you back the ID whose quota info you're getting. so you're not guessing who it is, bestie, the struct tells you 💅

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🌟 RETURN VALUE

See quotactl(2). (fr fr, the whole return-value story lives over there 👀)

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😭 ERRORS

See quotactl(2) too — but there's one special guest error that belongs here:

• ESRCH — there is no ID greater than or equal to id that has an active quota. 💀 like, nobody. not one. the search came back empty.

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👑 STANDARDS

Linux. that's it, that's the whole line 🐧

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🕰️ HISTORY

Linux 4.6 — she's been around since 2016, a certified elder of the nextquota lineage 🌈

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🦋 SEE ALSO

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

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and that's the page, bestie!! this whole writeup is from Linux man-pages 6.20, dated 2026-06-05, and yes the header at the top and the footer at the bottom of the original both just said Q_GETNEXTQUOTA(2const) — so now you know her government name too. go forth and quota responsibly 💜✨🎀