bcachefs: Fix a subtle race in the btree split path

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We have to free the old (in memory) btree node _before_ unlocking the
new nodes - else, some other thread with a read lock on the old node
could see stale data after another thread has already updated the new
node.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

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Kent Overstreet 2019-10-11 14:45:22 -04:00 • committed by Kent Overstreet

parent 9a3df993e1

commit ea3532cbf7

3 changed files with 18 additions and 4 deletions

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5

fs/bcachefs/btree_gc.c

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2

fs/bcachefs/btree_iter.c

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15

fs/bcachefs/btree_update_interior.c

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