gfs2_jdata_writeback(9)

💫 gfs2_jdata_writeback — a Kernel API Manual moment 💫

okay so bestie, we're in the Kernel API Manual today and the star of the show is gfs2_jdata_writeback(9). yes it's a mouthful, yes it's iconic, no we're not skipping any of it 🫶

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✨ NAME ✨

gfs2_jdata_writeback — write jdata folios to the log 💅

like, literally. the whole job. folios go in, log gets written. periodt.

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🦋 SYNOPSIS 🦋

int gfs2_jdata_writeback (struct address_space *mapping , struct
writeback_control *wbc );

two args, one int coming back at you. that's the whole vibe check ngl ✨

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🎀 ARGUMENTS 🎀

• mapping — the mapping to write. yeah, THE mapping. the one you're writing. she's the main character here 👑
• wbc — the writeback control. the little control panel that tells the writeback what's up 🎛️

that's it. no secret third argument. no hidden lore. iykyk 😌

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🌸 RETURN 🌸

errno 💀

yep, that's the whole return section. it returns errno. no further comment, the manpage said what it said.

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🌈 SEE ALSO 🌈

okay this list is long and honestly kind of iconic, so buckle up buttercup 🧚

Kernel file ./fs/gfs2/aops.c, plus the whole squad:

• gfs2_get_block_noalloc(9)
• gfs2_write_jdata_folio(9)
• __gfs2_jdata_write_folio(9)
• gfs2_writepages(9)
• gfs2_write_jdata_batch(9)
• gfs2_write_cache_jdata(9)
• gfs2_jdata_writepages(9)
• stuffed_read_folio(9)
• gfs2_read_folio(9)
• gfs2_internal_read(9)
• gfs2_readahead(9)
• adjust_fs_space(9)
• gfs2_bmap(9)
• gfs2_release_folio(9)

yes bestie, read them all. no skipping. i will know 🔥

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quick reminder that every single one of those references and that ./fs/gfs2/aops.c path is copy-paste exact — do not come for me about spelling, it's canon 💖

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aaaand that's the whole page!! short, sweet, extremely specific. mwah 💋

signing off from ./fs/gfs2, dated October 2026 — catch you on the next manpage, bestie 🎀✨🦋