inode_fsgid_set(9)

💅 inode_fsgid_set(9) — kernel API manual, but make it make sense 🎀

okay bestie, welcome to the Kernel API Manual ✨ this one's called inode_fsgid_set and it's a lil function that's genuinely so simple you'll be like "wait that's it??" — but that's the vibe, we love a low-effort icon 💖

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✨ NAME ✨

inode_fsgid_set — initialize inode's i_gid field with the caller's fsgid 🫶

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🌸 SYNOPSIS 🌸

void inode_fsgid_set (struct inode *inode , struct mnt_idmap *idmap );

like, two args, no return value (void, she gives nothing back, she's just here to do the thing) 💅

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🦋 ARGUMENTS 🦋

• inode — the inode to initialize, aka the main character of this whole operation 👑
• idmap — the idmap of the mount the inode was found from, aka the mapping receipts 🧾

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💜 DESCRIPTION 💜

so the whole job is: initialize the i_gid field of inode. that's it. that's the post 📌

and here's the cute part — if the inode was found/created via an idmapped mount, you map the caller's fsgid according to idmap. so the group id you end up with is properly translated for that mount's mapping ✨ no cap, that's the entire description, she's short and she knows it 🍓

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🔥 SEE ALSO 🔥

okay this is the part where the manpage absolutely ate and left zero crumbs — here's the full squad, all 28 of them, no skipping, we don't do that here 💀

• Kernel file ./include/linux/fs.h
• enum positive_aop_returns(9)
• struct address_space(9)
• struct file_ra_state(9)
• struct file(9)
• i_uid_into_vfsuid(9)
• i_uid_needs_update(9)
• i_uid_update(9)
• i_gid_into_vfsgid(9)
• i_gid_needs_update(9)
• i_gid_update(9)
• inode_fsuid_set(9)
• fsuidgid_has_mapping(9)
• inode_set_ctime(9)
• file_write_started(9)
• file_write_not_started(9)
• struct renamedata(9)
• is_mgtime(9)
• iput_if_not_last(9)
• is_idmapped_mnt(9)
• file_start_write(9)
• file_end_write(9)
• kiocb_start_write(9)
• kiocb_end_write(9)
• name_is_dot_dotdot(9)
• name_contains_dotdot(9)
• inode_dio_begin(9)
• inode_dio_end(9)
• generic_ci_validate_strict_name(9)

like, that's a whole friend group 😭 go read them, iykyk 🧚

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ok quick note bestie: inode_fsgid_set is the gid one — don't mix her up with inode_fsuid_set up there in the see-also, that's the uid twin. different function, different field, same energy 🙈

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🌈 sign-off 🌈

that's the whole page! it lives in ./include/linux, this particular printing is dated October 2026, and it ships with the Kernel API Manual — mwah, go initialize some inodes responsibly 💖✨🎀🦋💅