nilfs_palloc..._max_entries(9)

📦 version 7.3.1, in nixpkgs unstable

💅 nilfs_palloc..._max_entries(9) 🎀

okay bestie so we're in the Kernel API Manual today — yes, the kernel, we're doing kernel content, main character energy fr — and this page is all about nilfs_palloc_count_max_entries, which sounds terrifying but it's literally just a little counter that tells you the ceiling ✨

🌸 NAME 🌸

nilfs_palloc_count_max_entries — counts the max number of entries that can be described by descriptor blocks count. yeah. that's the whole job. it's a "how many can we fit" girlie and she takes it very seriously 💅

🦋 SYNOPSIS 🦋

int nilfs_palloc_count_max_entries (struct inode *inode , u64 nused ,
u64 *nmaxp );

💖 ARGUMENTS 💖

  • inode — the inode of the metadata file that's using this allocator. like, who's house are we in 🏠
  • nused — the current number of used entries. the "how many are already taken" number, rn, in real time.
  • nmaxp — max number of entries, and note the [out] — this one is output, so she writes back to you, she does not read. output only. 💌

🔥 RETURN 🔥

returns 0 on success 🎉 — but if it fails, it hands you one of these negative error codes, and each one is a different flavour of "nope":

  • -EIO — I/O error (including metadata corruption). and yes, metadata corruption counts here, so if your metadata is a mess, this is your sign 😭
  • -ENOMEM — insufficient memory available. the vibes were there but the RAM was not 💀
  • -ERANGE — number of entries in use is out of range. the number you gave is just… not in the accepted range, bestie, and we have to talk about it 🚩
ngl these are all negative codes, so anything that isn't 0 means something went sideways. check it, don't ignore it, that's the whole point of a return value 🫶

⭐ SEE ALSO ⭐

kernel file ./fs/nilfs2/alloc.c — and then, ok, the entire friend group, buckle up 🧚:

like I said. the whole group chat 👑💜

✨ sign-off time ✨ this one lives in ./fs/nilfs2, and it's dated October 2026 — so yeah, she's from the future and she still can't tell you how many entries fit without doing the math 🙈 slay, honestly. periodt. 💅🎀

📦 where this page comes from