is_idmapped_mnt(9)

💅 is_idmapped_mnt(9) — like, the Kernel API Manual page you didn't know you needed 🎀

okay so bestie, welcome to the Kernel API Manual entry for is_idmapped_mnt — yes that's the function AND the manual page name, we love a self-titled icon 👑

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✨ NAME ✨

is_idmapped_mnt — check whether a mount is mapped 🌸

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✨ SYNOPSIS ✨

bool is_idmapped_mnt (const struct vfsmount *mnt );

literally that's the whole vibe. one function, one pointer, one bool return 🦋

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✨ ARGUMENTS ✨

• mnt — the mount you wanna check, bestie. that's the one. the mount to check 💖

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✨ DESCRIPTION ✨

so here's the tea 🍓 — if mnt has an non nop_mnt_idmap attached to it, then mnt is mapped. that's it. that's the whole check. no cap.

side note: nop_mnt_idmap shows up in there exactly like that in the source, so we're keeping it exactly like that. not me fixing typos that aren't mine to fix 🙈

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✨ RETURN ✨

• true if the mount is mapped 👑
• false if it's not 💀

binary queen. no in-between. periodt.

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✨ SEE ALSO ✨

bestie there are SO many friends in this section, we're basically at a function reunion 🫶 all of these live over in the 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)
• 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)
• 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, go read them all?? main character energy from every single one of them honestly 🌈

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💜 okay that's the page!! sourced from the ./include/linux corner of the world, dated October 2026 — mwah, catch you on the next manpage bestie, slay 💅✨