Btrfs: Add a skip_locking parameter to struct path, and make various funcs honor it

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Allocations may need to read in block groups from the extent allocation tree,
which will require a tree search and take locks on the extent allocation
tree.  But, those locks might already be held in other places, leading
to deadlocks.

Since the alloc_mutex serializes everything right now, it is safe to
skip the btree locking while caching block groups.  A better fix will be
to either create a recursive lock or find a way to back off existing
locks while caching block groups.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

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This commit is contained in:

Chris Mason 2008-06-25 16:01:30 -04:00

parent 168fd7d271

commit 5cd57b2cbb

3 changed files with 25 additions and 14 deletions

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32

fs/btrfs/ctree.c

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1

fs/btrfs/ctree.h

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6

fs/btrfs/extent-tree.c

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