path_is_mountpoint(9)

🦋 path_is_mountpoint(9) — the Kernel API Manual, bestie edition 🦋

okay so real talk, this one lives in the <pink>Kernel API Manual</pink> and it is so much more chill than it sounds, i promise 💖

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✨ NAME ✨

path_is_mountpoint — checks if a path is a mount in the current namespace. that's it. that's the whole vibe check 🔥

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🌸 SYNOPSIS 🌸

bool path_is_mountpoint (const struct path *path );

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🎀 ARGUMENTS 🎀

• path — the path to check. like, the actual thing u want the answer about 👀

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💜 DESCRIPTION 💜

okay so here's the tea, bestie ☕ d_mountpoint can only be used reliably to establish if a dentry is not mounted in any namespace — and that common case is handled inline. iconic, efficient, we love that for it 🫶

but d_mountpoint isn't aware of the possibility there may be multiple mounts using a given dentry in a different namespace. yeah. it doesn't know. it's living its truth and that truth is incomplete 😭

so this function checks if the passed-in path is a mountpoint rather than the dentry alone. literally the whole point. main character energy ✨

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🌈 SEE ALSO 🌈

Kernel file ./fs/namespace.c and the whole squad:

• mnt_get_write_access(9)
• mnt_want_write(9)
• mnt_get_write_access_file(9)
• mnt_want_write_file(9)
• mnt_put_write_access(9)
• mnt_drop_write(9)
• mnt_hold_writers(9)
• mnt_unhold_writers(9)
• __lookup_mnt(9)
• lookup_mnt(9)
• attach_mnt(9)
• vfs_create_mount(9)
• may_umount_tree(9)
• may_umount(9)
• clone_private_mount(9)
• attach_recursive_mnt(9)
• do_lock_mount(9)
• path_overmounted(9)
• can_move_mount_beneath(9)
• mnt_set_expiry(9)
• mnt_allow_writers(9)

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and that's the whole page, no cap 🧚 this cutie came straight out of ./fs and it's dated October 2026 — go forth and check ur mountpoints, bestie 💅💖