LLAPI_FID_TO_HANDLE(3)

💅 LLAPI_FID_TO_HANDLE 💅

okay bestie, welcome to llapi_fid_to_handle(3), a little gem from the Lustre Library Functions crew. this is the one that hands you an NFS handle for a File Identifier, no notes, no cap. 🎀

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✨ NAME ✨

llapi_fid_to_handle — allocate an NFS handle for File Identifier

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🌸 SYNOPSIS 🌸

#include <lustre/lustreapi.h>

int llapi_fid_to_handle(struct file_handle **handle, struct lu_fid *fid);

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🦋 DESCRIPTION 🦋

so llapi_fid_to_handle() allocates an NFS file handle for the File Identifier that you pass in as fid, and the whole point is that you get to use it later with open_by_handle_at(2). it's giving very much name_to_handle_at(2) energy — same vibe, different path — and it's lowkey perfect for Lustre-specific tools and interfaces. ✨

now the tea, and this part matters: the llapi_fid_to_handle(3) function itself does not require root access. but open_by_handle_at(2)? yeah that one does require root access, because it bypasses all pathname-derived file access permissions. like, all of them. so be mindful, bestie, that's why the root requirement is there. 🔥

one more thing, don't skip this: the memory that gets allocated for handle and returned to you (the caller) must be freed with free(2). free your handle. it's the right thing to do. 🫶

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⭐ RETURN VALUES ⭐

returns 0 on success, or a negative errno on failure. simple as that. 💅

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💀 ERRORS 💀

• -ENOMEM — no memory was available for allocating handle. your handle said "not today". 😭

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👑 AVAILABILITY 👑

llapi_fid_to_handle() is part of the lustre(7) user application interface library since release 2.16.0. so if you're on something ancient, that's a you problem fr fr. 🌈

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🎀 SEE ALSO 🎀

• name_to_handle(2)
• open_by_handle_at(2)
• free(3)
• llapi_fid_parse(3)
• llapi_fid2path(3)
• llapi_path2fid(3)
• lustreapi(7)

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okay that's the whole page bestie, you ate. 🍓 this was Lustre User API, dated 2024-08-23, and honestly? iconic. periodt. 💖✨