btrfs: introduce BTRFS_NESTING_LEFT/BTRFS_NESTING_RIGHT

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Our lockdep maps are based on rootid+level, however in some cases we
will lock adjacent blocks on the same level, namely in searching forward
or in split/balance.  Because of this lockdep will complain, so we need
a separate subclass to indicate to lockdep that these are different
locks.

lock leaf -> BTRFS_NESTING_NORMAL
  cow leaf -> BTRFS_NESTING_COW
    split leaf
       lock left -> BTRFS_NESTING_LEFT
       lock right -> BTRFS_NESTING_RIGHT

The above graph illustrates the need for this new nesting subclass.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2020-08-20 11:46:04 -04:00 • committed by David Sterba

parent 9631e4cc1a

commit bf77467a93

2 changed files with 20 additions and 8 deletions

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16

fs/btrfs/ctree.c

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12

fs/btrfs/locking.h

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