fh_want_write(9)

💅 fh_want_write(9)

ok so this is a page from the Kernel API Manual bestie, and it's literally about fh_want_write — the little function that asks "hey, can I write to this export or not?" 🎀

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✨ NAME ✨

fh_want_write — Get write access to an export 🌸

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🦋 SYNOPSIS 🦋

int fh_want_write (struct svc_fh *fhp );

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🎀 ARGUMENTS 🎀

• fhp — File handle of file to be written. that's the one, the file handle, the whole point 🫶

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💖 DESCRIPTION 💖

ok so listen 👑 — the caller must invoke fh_drop_write when its write operation is complete. like, that's not a suggestion, that's the rule, no cap 💅

It returns 0 if the file handle's export can be written to. slay, go off ✨

Otherwise? the export is not prepared for updates, and the returned negative errno value reflects the reason for the failure. so if you get a negative number back, that's your explanation right there, iykyk 🔥

real talk bestie: the fh_drop_write follow-up is mandatory, not optional. don't leave it hanging 😭

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🌈 SEE ALSO 🌈

• Kernel file ./fs/nfsd/nfsfh.h
• fh_drop_write(9)
• knfsd_fh_hash(9)
• fh_clear_pre_post_attrs(9)

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and that's the whole page, bestie, you ate that 🍓 💜

mwah 💋 — brought to you by ./fs/nfsd, dated October 2026 ✨