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bcachefs: Reduce would_deadlock restarts

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We don't have to take locks in any particular ordering - we'll make
forward progress just fine - but if we try to stick to an ordering, it
can help to avoid excessive would_deadlock transaction restarts.

This tweaks the reflink path to take extents btree locks in the right
order.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2024-01-10 23:47:04 -05:00
parent 5b14ce35af
commit 57f2d20976
1 changed files with 7 additions and 0 deletions
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fs/bcachefs/reflink.c
+7
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@@ -486,6 +486,13 @@ s64 bch2_remap_range(struct bch_fs *c,
bch2_btree_iter_set_snapshot(&dst_iter, dst_snapshot);
if (dst_inum.inum < src_inum.inum) {
/* Avoid some lock cycle transaction restarts */
ret = bch2_btree_iter_traverse(&dst_iter);
if (ret)
continue;
}
dst_done = dst_iter.pos.offset - dst_start.offset;
src_want = POS(src_start.inode, src_start.offset + dst_done);
bch2_btree_iter_set_pos(&src_iter, src_want);