opinfo_read_handle_to_read(9)

💅 opinfo_read_handle_to_read — from the Kernel API Manual, bestie 💖

Okay so picture this: you're deep in the kernel API manual (yes, that manual — we're fancy now ✨) and you stumble on opinfo_read_handle_to_read. It's not giving main-character energy on its own, but it's a supporting icon and we're gonna understand it. Periodt.

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✨ NAME ✨

opinfo_read_handle_to_read — the glow-up function: it converts a read/handle oplock into a plain old read oplock. Lowkey a makeover montage in C. 🦋

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🎀 SYNOPSIS 🎀

int opinfo_read_handle_to_read (struct oplock_info *opinfo );

That's it. One function, one argument, no drama. Ngl it's giving "small but mighty." 👑

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🌸 ARGUMENTS 🌸

• opinfo — the current oplock info. Like, the actual oplock object you're working with rn. Hand it over and it gets the transformation. 💅

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⭐ RETURN ⭐

• 0 on success — we love a clean win, no notes, ate. 🎉
• otherwise -EINVAL — something was off with what you passed in, so bestie, go check your args. 😭

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💜 SEE ALSO 💜

Alright, this is the group chat of related functions — not one of them gets left on read. These all live in the kernel file ./fs/smb/server/oplock.c, and they all pull up in the same friend group:

• Oplock conversions, the whole squad — alloc_opinfo(9), opinfo_write_to_read(9), opinfo_write_to_none(9), opinfo_read_to_none(9)
• Lease upgrades & transitions — lease_read_to_write(9), lease_none_upgrade(9)
• Closing & granting — close_id_del_oplock(9), grant_write_oplock(9), grant_read_oplock(9), grant_none_oplock(9), same_client_has_lease(9)
• Break notifications, the dramatic ones — __smb2_oplock_break_noti(9), smb2_oplock_break_noti(9), __smb2_lease_break_noti(9), smb2_lease_break_noti(9)
• Granting & breaking at scale — smb_grant_oplock(9), smb_break_all_write_oplock(9), __smb_break_all_levII_oplock(9), smb_break_all_oplock(9)
• Mapping & buffers — smb2_map_lease_to_oplock(9), create_lease_buf(9), parse_lease_state(9), smb2_find_context_vals(9), create_durable_rsp_buf(9), create_durable_v2_rsp_buf(9), create_mxac_rsp_buf(9), create_posix_rsp_buf(9), create_aapl_rsp_buf(9), lookup_lease_in_table(9)

Fr fr, that's all 29 of them. Don't come for me if you skim — they're all up there. 🙈

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And that's the whole page! Shoutout to ./fs/smb/server for being the home base, dated October 2026, filed under opinfo_read_handle_to_read(9) — she's iconic, she's documented, she's done. 🫶💖🎀