iterate_supers_type(9)

✨ iterate_supers_type(9) ✨

okay so this is from the Kernel API Manual, bestie, and it's literally about calling a function for superblocks of a given type. iconic behavior fr fr 💅

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🌸 NAME 🌸

iterate_supers_type — call function for superblocks of given type

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🎀 SYNOPSIS 🎀

void iterate_supers_type (struct file_system_type *type , void
(*f)(struct super_block *, void *) , void *arg );

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💖 ARGUMENTS 💖

• type — the fs type, like, which flavor of filesystem we're talking about 🦋
• f — the function to call, the main character of this whole operation
• arg — the argument to pass to it, lil care package 🎁

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✨ DESCRIPTION ✨

So here's the vibe: it scans the superblock list and calls the given function, passing it a locked superblock and the given argument. that's it, that's the whole thing. no cap, it's giving "iterator with commitment issues" but in a good way 😭

lowkey important detail: the superblock arrives locked when your function gets it. do not sleep on that. 🔒

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🔥 SEE ALSO 🔥

Kernel file ./fs/super.c:

• super_lock(9)
• alloc_super(9)
• deactivate_locked_super(9)
• deactivate_super(9)
• grab_super(9)
• retire_super(9)
• generic_shutdown_super(9)
• sget_fc(9)
• reconfigure_super(9)
• emergency_thaw_all(9)
• get_anon_bdev(9)
• sget_dev(9)
• fs_bdev_freeze(9)
• fs_bdev_thaw(9)
• fs_bdev_file_open_by_dev(9)
• fs_bdev_file_open_by_path(9)
• fs_bdev_unregister(9)
• fs_bdev_file_release(9)
• get_tree_bdev_flags(9)
• get_tree_bdev(9)
• vfs_get_tree(9)
• sb_wait_write(9)
• freeze_super(9)
• thaw_super(9)

like, the whole superblock friend group showed up to the party 🫶👑

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mwah 💋 this page lives in ./fs and the version it's serving is October 2026 — go read it again sometime, bestie, it's worth it ⭐🌈