gfs2_write_alloc_required(9)

💫 gfs2_write_alloc_required(9) 💫

okay bestie, welcome to the Kernel API Manual ✨ this one lives in the kernel API docs and tbh it's a little icon — it's literally just a yes/no girlie. no cap.

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🌸 NAME 🌸

gfs2_write_alloc_required — figure out if a write will require an allocation 🧚

like, will this write need new blocks carved out of the filesystem, or are we chillin' in space that's already ours? that's the whole vibe check.

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✨ SYNOPSIS ✨

int gfs2_write_alloc_required (struct gfs2_inode *ip , u64 offset ,
unsigned int len );

three args, one int coming back at you. simple. iconic. 💅

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🎀 ARGUMENTS 🎀

• ip — the file being written to 🗂️ your main character inode, fr fr.
• offset — the offset to write to 📍 like, where in the file are we dropping this data.
• len — the number of bytes being written 📏 the size of the little payload, bestie.

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🦋 RETURN 🦋

• 1 — an alloc is required 🔥 yes queen, go allocate.
• 0 — otherwise 🌈 nope, no allocation needed, we're good.

that's it. that's the return value. 1 or 0. no secret third thing 🙈

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🌟 SEE ALSO 🌟

Kernel file ./fs/gfs2/bmap.c — and honestly the whole bmap.c friend group showed up, so let's give them their shoutouts 👑

• gfs2_unstuffer_folio(9)
• gfs2_unstuff_dinode(9)
• find_metapath(9)
• metaptr1(9)
• metapointer(9)
• lookup_metapath(9)
• fillup_metapath(9)
• gfs2_extent_length(9)
• gfs2_hole_size(9)
• __gfs2_iomap_alloc(9)
• gfs2_alloc_size(9)
• __gfs2_iomap_get(9)
• gfs2_block_map(9)
• gfs2_journaled_truncate(9)
• sweep_bh_for_rgrps(9)
• find_nonnull_ptr(9)
• punch_hole(9)
• do_shrink(9)
• do_grow(9)
• gfs2_setattr_size(9)
• gfs2_free_journal_extents(9)
• gfs2_add_jextent(9)
• gfs2_map_journal_extents(9)

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💖 quick reminder bestie: 1 means allocation required, 0 means it's not. don't flip them, i'm begging 😭

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and that's the page!! 🫶 this little cutie is from ./fs/gfs2, dated October 2026, under the Kernel API Manual banner — go forth and allocate responsibly, mwah 💋🎀