fscache_beg...te_operation(9)

📦 version 7.3.1, in nixpkgs unstable

💜 fscache_begin_write_operation — NAME

ok so bestie, fscache_begin_write_operation is literally the function that kicks off a write operation for the netfs lib. that's it, that's the whole name. it's from the Kernel API Manual, and it's giving very much "start of something big" energy fr fr ✨

🦋 SYNOPSIS

int fscache_begin_write_operation (struct netfs_cache_resources *cres ,
struct fscache_cookie *cookie );

like, she takes two things and hands you back an int. simple. iconic. no notes 💅

🎀 ARGUMENTS

  • cres — the cache resources for the write you're about to do. she's the one holding all the state, ok? 🫶
  • cookie — the cookie representing the cache object. the actual thing being accessed. main character, honestly 👑

🌸 DESCRIPTION

okay so picture this: you're the netfs helper library and you need to begin a write operation. that's literally what this does — begins a write operation on your behalf 💖

cres is where it's at: it indicates the cache resources to which the operation state should be attached. cookie, meanwhile, indicates the cache object that will be accessed. two little pointers, one big job ✨

and here's the cute part — cres->inval_counter gets set from cookie->inval_counter for comparison at the end of the operation. why? so that if an invalidation happens during the operation, the caller can detect it. it's basically a vibe check for invalidation, no cap 🔥

⭐ RETURN

  • 0 — Success 🎉
  • -ENOBUFS — No caching available 😭
  • Other error code from the cache, such as -ENOMEM. 💀

🌈 SEE ALSO

kernel file ./include/linux/fscache.h, plus the whole friend group:

ngl bestie, if the cache hands you an error other than -ENOBUFS, don't panic — it's just the cache telling you how it feels. -ENOMEM is the classic. 🙈

that's the whole page, bestie! 🧚 from ./include/linux, dated October 2026 — mwah, go write something iconic 💅💖

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