mnt_drop_write(9)

okay so bestie, welcome to mnt_drop_write(9) from the Kernel API Manual — this is literally the “we are so done writing to this mount” cleanup call, and it's lowkey iconic 🎀💅

🌸 NAME 🌸

mnt_drop_write — give up write access to a mount. That's the vibe, no cap 💖

✨ SYNOPSIS ✨

void mnt_drop_write (struct vfsmount *mnt );

🎀 ARGUMENTS 🎀

• mnt — the mount on which to give up write access. That's the mount you're releasing from write duty, periodt 🫶

🦋 DESCRIPTION 🦋

Okay so here's the tea: this tells the low-level filesystem that we are done performing writes to it, and it also allows the filesystem to be frozen again. fr fr, that's the whole job 💜

vibe check: it must be matched with the mnt_want_write call above — they're a matched set, like bestie bracelets, and you do not want to leave that pairing hanging 😭

🌈 SEE ALSO 🌈

Kernel file: ./fs/namespace.c — yes, that's where the lore lives 👑

And these refs all get their moment:

• 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_hold_writers(9)
• mnt_unhold_writers(9)
• __lookup_mnt(9)
• lookup_mnt(9)
• attach_mnt(9)
• vfs_create_mount(9)
• path_is_mountpoint(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)

k that's the page, bestie 🫶 — source/version is ./fs, dated October 2026, and the manual entry is mnt_drop_write(9). slay ✨