Linux is a clone of the operating system Unix, written from scratch by Linus Torvalds with assistance from a loosely-knit team of hackers across the Net.
![]() 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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