bcachefs: New locking functions

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In the future, with the new deadlock cycle detector, we won't be using
bare six_lock_* anymore: lock wait entries will all be embedded in
btree_trans, and we will need a btree_trans context whenever locking a
btree node.

This patch plumbs a btree_trans to the few places that need it, and adds
two new locking functions
 - btree_node_lock_nopath, which may fail returning a transaction
   restart, and
 - btree_node_lock_nopath_nofail, to be used in places where we know we
   cannot deadlock (i.e. because we're holding no other locks).

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

...

This commit is contained in:

Kent Overstreet 2022-08-21 14:29:43 -04:00 • committed by Kent Overstreet

parent 546180874a

commit ca7d8fcabf

10 changed files with 182 additions and 96 deletions

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21

fs/bcachefs/btree_cache.c

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4

fs/bcachefs/btree_cache.h

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40

fs/bcachefs/btree_gc.c

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8

fs/bcachefs/btree_io.c

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82

fs/bcachefs/btree_key_cache.c

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2

fs/bcachefs/btree_locking.c

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18

fs/bcachefs/btree_locking.h

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95

fs/bcachefs/btree_update_interior.c

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1

fs/bcachefs/btree_update_interior.h

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7

fs/bcachefs/btree_update_leaf.c

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