generic_ci_d_compare(9)

💅 generic_ci_d_compare — like, the whole manual page, bestie

okay so real talk: we're deep in the Kernel API Manual today (generic_ci_d_compare(9), if you're keeping track), and this one is a little niche but honestly kind of iconic once you get it. sit down, grab a strawberry drink 🍓, and let me tell you about the generic d_compare implementation for casefolding filesystems. yes, casefolding — the thing that makes your files not care about case. she's serving inclusivity, she's serving convenience. periodt.

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✨ NAME ✨

generic_ci_d_compare — the generic d_compare implementation for casefolding filesystems. that's it, that's the whole vibe check. 🦋

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🌸 SYNOPSIS 🌸

int generic_ci_d_compare (const struct dentry *dentry , unsigned int len
, const char *str , const struct qstr *name );

look at her. four arguments, one int return, no cap. copy it exactly if you're using it, because I am not about to let you get the signature wrong in front of the whole group chat 😭

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🎀 ARGUMENTS 🎀

• dentry — the dentry whose name we are checking against. she's the main character here, the one we're all here for 👑
• len — len of name of dentry. yes, it's literally just the length of the dentry's name, she's not hiding anything 💅
• str — str pointer to name of dentry. this is the actual string pointer to that dentry name, so like, point her the right way please 🙈
• name — Name to compare against. the challenger. the opponent. the one who shows up and gets compared 🔥

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⭐ RETURN ⭐

• 0 if names match 🫶 (besties! they match!)
• 1 if mismatch 💀 (awkward. they don't match. we move)
• or -ERRNO — an error, negative errno style, so keep your eyes peeled for that one

okay so the numbers here actually matter, don't get cute with them — 0 means match and 1 means mismatch, and any negative value is an error. those are not interchangeable, bestie ✨

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🧚 SEE ALSO 🧚

kernel file ./fs/libfs.c, and then a whole friend group of related functions — honestly this list ate, look at all of them:

• simple_offset_init(9)
• simple_offset_add(9)
• simple_offset_remove(9)
• simple_offset_rename(9)
• simple_offset_rename_exchange(9)
• simple_offset_destroy(9)
• offset_dir_llseek(9)
• offset_readdir(9)
• simple_rename_timestamp(9)
• simple_setattr(9)
• simple_write_end(9)
• simple_read_from_buffer(9)
• simple_write_to_buffer(9)
• memory_read_from_buffer(9)
• generic_encode_ino32_fh(9)
• generic_fh_to_dentry(9)
• generic_fh_to_parent(9)
• simple_fsync_noflush(9)
• simple_fsync(9)
• generic_check_addressable(9)
• simple_get_link(9)
• generic_ci_d_hash(9)
• generic_ci_match(9)
• generic_set_sb_d_ops(9)
• inode_maybe_inc_iversion(9)
• inode_query_iversion(9)
• simple_inode_init_ts(9)
• path_from_stashed(9)
• simple_start_creating(9)

iykyk 💜 catch you all in the adjacent manpages.

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that's the page! source is ./fs, dated October 2026, and we're all wrapped up in generic_ci_d_compare(9) 💖 bye bestie, stan casefolding filesystems responsibly 🌈