shrink_dcache_sb(9)

💅 shrink_dcache_sb(9) — Kernel API Manual ✨

hey bestie, welcome to the Kernel API Manual page for shrink_dcache_sb(9) — it’s short, it’s sweet, and it’s lowkey doing important cleanup work. 🫶

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🌸 NAME 🌸

shrink_dcache_sb — shrink dcache for a superblock. periodt. 💅

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✨ SYNOPSIS ✨

okay so the signature is literally this, bestie:

void shrink_dcache_sb (struct super_block *sb );

void era — no return value in the signature, no cap. 🌈

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🎀 ARGUMENTS 🎀

• sb — the superblock 💖 that’s the whole argument, and yes, it’s a struct super_block *.

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🦋 DESCRIPTION 🦋

okay so shrink_dcache_sb shrinks the dcache for the specified super block. that’s the main character energy right there. ✨

it’s used to free the dcache before unmounting a file system — so it’s the pre-unmount cleanup moment, and it ate. 🧚💜

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🔥 SEE ALSO 🔥

Kernel file ./fs/dcache.c is where this lives, and here are all the related entries — every single one, no skipping:

• d_drop(9)
• dentry_kill(9)
• __move_to_shrink_list(9)
• d_find_any_alias(9)
• d_find_alias(9)
• prune_dcache_sb(9)
• enum d_walk_ret(9)
• d_walk(9)
• path_has_submounts(9)
• shrink_dcache_tree(9)
• d_invalidate(9)
• __d_alloc(9)
• d_alloc(9)
• d_alloc_pseudo(9)
• d_instantiate(9)
• d_obtain_alias(9)
• d_obtain_root(9)
• d_add_ci(9)
• d_same_name(9)
• __d_lookup_rcu(9)
• d_lookup(9)
• __d_lookup(9)
• d_hash_and_lookup(9)
• d_delete(9)
• d_rehash(9)
• d_add(9)
• d_ancestor(9)
• d_splice_alias(9)
• is_subdir(9)

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🫶 that’s the whole page, bestie — source/version ./fs, dated October 2026, for shrink_dcache_sb(9). mwah 💖