gfs2_extent_length(9)

💅 gfs2_extent_length(9) — it's in the Kernel API Manual, bestie ✨

Okay so picture this: you're deep in the GFS2 source, you open ./fs/gfs2/bmap.c, and you meet gfs2_extent_length — the little function that could 🫶. Her whole job? She hands you back the length of an extent of blocks. That's it, that's the vibe. Iconic, lowkey essential, no cap.

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✨ NAME ✨

gfs2_extent_length — returns length of an extent of blocks 🌸

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🎀 SYNOPSIS 🎀

unsigned int gfs2_extent_length (struct buffer_head *bh , __be64 *ptr ,
       int *eob );

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🦋 ARGUMENTS 🦋

• bh — the metadata block 🧚 literally the block we're poking around in
• ptr — the current position in bh 📍 like, where are we right now
• eob — gets set to 1 if we hit "end of block" 😭 yeah, that kind of end-of-block

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👑 RETURN 👑

The length of the extent — and the minimum is one block ⭐ so you're never getting zero back, periodt.

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🌈 SEE ALSO 🌈

Kernel file ./fs/gfs2/bmap.c, plus the whole friend group 💖:

• gfs2_unstuffer_folio(9)
• gfs2_unstuff_dinode(9)
• find_metapath(9)
• metaptr1(9)
• metapointer(9)
• lookup_metapath(9)
• fillup_metapath(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)
• gfs2_write_alloc_required(9)

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Go read the whole squad, bestie — they all live together in ./fs/gfs2/bmap.c and honestly the group chat is popping 🍓

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💜 That's the page! Shoutout to the ./fs/gfs2 directory for hosting, the October 2026 date for keeping it fresh, and gfs2_extent_length(9) herself for being the main character of this manual 🌸✨ mwah, bye! 💅