STRUCT P9_QID(9)

🌸 NAME 🌸

struct p9_qid — file system entity information. Hiii bestie, this is struct p9_qid(9) from the Kernel API Manual 💖 and it’s literally all about how qids track file system entities.

✨ SYNOPSIS ✨

struct p9_qid {
    u8 type;
    u32 version;
    u64 path;
 };

🎀 Members 🎀

• type — an 8-bit type, p9_qid_t 👑
• version — a 16-bit monotonically incrementing version number ⏫
• path — a 64-bit per-server-unique ID for a file system element 🧚

💖 Description 💖

okay so qids are the identifiers that 9P servers use to track file system entities. The type is what differentiates semantics for operations on the entity — ie. read means something different on a directory than on a file. The path gives you a server unique index for an entity (roughly analogous to an inode number), while the version gets updated every time a file is modified and can be used to maintain cache coherency between clients and servers. Servers will often differentiate purely synthetic entities by setting their version to 0, signaling that they should never be cached and should be accessed synchronously. 🫶

Extra link from the page: See Also://plan9.bell-labs.com/magic/man2html/2/stat

🔥 SEE ALSO 🔥

Kernel file ./include/net/9p/9p.h, plus all these besties:

• enum p9_debug_flags(9)
• enum p9_msg_t(9)
• enum p9_open_mode_t(9)
• enum p9_perm_t(9)
• enum p9_qid_t(9)
• struct p9_wstat(9)
• struct p9_iattr_dotl(9)
• struct p9_fcall(9)

Okay that’s the whole page, bestie — source/version ./include/net/9p, dated October 2026, for struct p9_qid(9). mwah 💋✨