nilfs_dat_freev(9)

✨ nilfs_dat_freev(9) ✨

okay so bestie, this is a page from the Kernel API Manual — it's nilfs_dat_freev, and it's lowkey the cleanup crew of the NILFS2 DAT world 💅

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🎀 NAME 🎀

nilfs_dat_freev — free virtual block numbers, aka the "you can have this back" of virtual block numbers 🫶

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🌸 SYNOPSIS 🌸

int nilfs_dat_freev (struct inode *dat , __u64 *vblocknrs , size_t nitems );

like, that's the whole signature, no cap ✨

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🦋 ARGUMENTS 🦋

• dat — the DAT file inode. yes queen, the DAT file's very own inode 💖
• vblocknrs — an array of virtual block numbers. it's giving "the guest list" 🎀
• nitems — how many virtual block numbers are in that array. count 'em, bestie 🔢

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🌈 DESCRIPTION 🌈

so what it does is — nilfs_dat_freev frees the virtual block numbers specified by vblocknrs and nitems. that's it, that's the whole vibe. it takes the list, it takes the count, and it frees those virtual block numbers. iconic behavior honestly 👑

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⭐ RETURN ⭐

returns 0 on success 🎉 — or one of these negative error codes if it's not vibing:

• -EIO — I/O error (including metadata corruption). like the disk said "no ❤️" and possibly the metadata is a mess too 😭
• -ENOENT — the virtual block number have not been allocated. you can't free what was never given, bestie 💀
• -ENOMEM — insufficient memory available. not enough RAM, tragic 🥲

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💜 SEE ALSO 💜

• Kernel file ./fs/nilfs2/dat.c — go read the source, iykyk 📖
• struct nilfs_dat_info(9)
• nilfs_dat_mark_dirty(9)
• nilfs_dat_move(9)
• nilfs_dat_translate(9)
• nilfs_dat_read(9)

the whole DAT friend group, fr fr 🫶🦋

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ngl bestie, if you're freeing virtual block numbers you better be sure they were allocated first — -ENOENT is literally right there waiting for you 🙈

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mwah 💋 that's the page! brought to you from ./fs/nilfs2, dated October 2026 — stan the NILFS2 filesystem, periodt 💅✨🎀