bcachefs: Better approach to write vs. read lock deadlocks

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Instead of unconditionally upgrading read locks to intent locks in
do_bch2_trans_commit(), this patch changes the path that takes write
locks to first trylock, and then if trylock fails check if we have a
conflicting read lock, and restart the transaction if necessary.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

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Kent Overstreet 2021-09-07 21:25:32 -04:00 • committed by Kent Overstreet

parent b301105b48

commit caaa66aa54

2 changed files with 82 additions and 41 deletions

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108

fs/bcachefs/btree_update_leaf.c

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15

fs/bcachefs/trace.h

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