i_uid_needs_update(9)

💅 i_uid_needs_update(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for i_uid_needs_update — yes that's the function name, and yes it's a whole manual page about one (1) little bool. main character energy fr fr.

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✨ NAME ✨

i_uid_needs_update — literally just checks whether an inode's i_uid needs to be updated 🫶 that's it, that's the job.

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🌸 SYNOPSIS 🌸

bool i_uid_needs_update (struct mnt_idmap *idmap , const struct iattr
*attr , const struct inode *inode );

it returns a bool, it takes three things, and honestly? iconic.

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🎀 ARGUMENTS 🎀

• idmap — the idmap of the mount the inode was found from. yes, that mount's idmap, bestie, don't mix them up 💀
• attr — the new attributes of the inode. the fresh fit it's trying on 👑
• inode — the inode to update. the one we're doing the vibe check on.

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🦋 DESCRIPTION 🦋

so here's the tea: this checks whether the $inode's i_uid field needs to be updated, and it does that taking idmapped mounts into account if the filesystem supports it ✨ lowkey important detail, highkey the whole point.

no cap, that's the entire description. short and slay. periodt.

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🌈 RETURN 🌈

• true — if the inode's i_uid field needs to be updated 💖
• false — if not 🙈

binary. simple. we love a decisive king.

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⭐ SEE ALSO ⭐

the whole friend group, assembled 🫶 and ngl, it's a long group chat — every single one of these:

• 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_update(9)
• i_gid_into_vfsgid(9)
• i_gid_needs_update(9)
• i_gid_update(9)
• inode_fsuid_set(9)
• inode_fsgid_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 I said. the whole squad. iykyk 💜

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ok that's the page!! this icon lives over in ./include/linux and the version stamp on this beauty is October 2026 — go off, calendar. mwah 💅✨🍓