metapointer(9)

✨ NAME ✨

okay so bestie, welcome to metapointer(9), straight outta the Kernel API Manual — and this one is literally about returning a pointer to the start of metadata in a buffer. iconic behavior, honestly.

metapointer — return pointer to start of metadata in a buffer 🫶

🌸 SYNOPSIS 🌸

__be64 * metapointer (unsigned int height , const struct metapath *mp );

🎀 ARGUMENTS 🎀

• height — the metadata height, and yes bestie, 0 = dinode 👑
• mp — the metapath, no cap

🦋 DESCRIPTION 🦋

So picture this: you've got a buffer that contains the pointer to the current height of the metadata tree. metapointer returns a pointer to the block number of the next height of the metadata tree. that's the vibe, that's the whole function, and it ate 💅

🌈 SEE ALSO 🌈

shoutout to the whole friend group — these are all from the kernel file ./fs/gfs2/bmap.c:

• gfs2_unstuffer_folio(9)
• gfs2_unstuff_dinode(9)
• find_metapath(9)
• metaptr1(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)
• gfs2_write_alloc_required(9)

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